Merge remote-tracking branch 'qatar/master'

* qatar/master: (26 commits)
  fate: use diff -b in oneline comparison
  Add missing version bumps and APIchanges/Changelog entries.
  lavfi: move buffer management function to a separate file.
  lavfi: move formats-related functions from default.c to formats.c
  lavfi: move video-related functions to a separate file.
  fate: make smjpeg a demux test
  fate: separate sierra-vmd audio and video tests
  fate: separate smacker audio and video tests
  libmp3lame: set supported channel layouts.
  avconv: automatically insert asyncts when -async is used.
  avconv: add support for audio filters.
  lavfi: add asyncts filter.
  lavfi: add aformat filter
  lavfi: add an audio buffer sink.
  lavfi: add an audio buffer source.
  buffersrc: add av_buffersrc_write_frame().
  buffersrc: fix invalid read in uninit if the fifo hasn't been allocated
  lavfi: rename vsrc_buffer.c to buffersrc.c
  avfiltergraph: reindent
  lavfi: add channel layout/sample rate negotiation.
  ...

Conflicts:
	Changelog
	doc/APIchanges
	doc/filters.texi
	ffmpeg.c
	ffprobe.c
	libavcodec/libmp3lame.c
	libavfilter/Makefile
	libavfilter/af_aformat.c
	libavfilter/allfilters.c
	libavfilter/avfilter.c
	libavfilter/avfilter.h
	libavfilter/avfiltergraph.c
	libavfilter/buffersrc.c
	libavfilter/defaults.c
	libavfilter/formats.c
	libavfilter/src_buffer.c
	libavfilter/version.h
	libavfilter/vf_yadif.c
	libavfilter/vsrc_buffer.c
	libavfilter/vsrc_buffer.h
	libavutil/avutil.h
	tests/fate/audio.mak
	tests/fate/demux.mak
	tests/fate/video.mak

Merged-by: Michael Niedermayer <michaelni@gmx.at>

33 files changed, 2315 insertions, 835 deletions

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 70f2c9e5ca..1f9d4117d1 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -2,6 +2,7 @@ include $(SUBDIR)../config.mak
 
 NAME = avfilter
 FFLIBS = avutil swscale
+FFLIBS-$(CONFIG_ASYNCTS_FILTER) += avresample
 FFLIBS-$(CONFIG_RESAMPLE_FILTER) += avresample
 
 FFLIBS-$(CONFIG_ACONVERT_FILTER)             += swresample
@@ -25,6 +26,7 @@ OBJS = allfilters.o                                                     \
        audio.o                                                          \
        avfilter.o                                                       \
        avfiltergraph.o                                                  \
+       buffer.o                                                         \
        buffersink.o                                                     \
        defaults.o                                                       \
        drawutils.o                                                      \
@@ -34,6 +36,8 @@ OBJS = allfilters.o                                                     \
        src_buffer.o                                                     \
        transform.o                                                      \
        vf_scale.o                                                       \
+       video.o                                                          \
+
 
 OBJS-$(CONFIG_AVCODEC)                       += avcodec.o
 OBJS-$(CONFIG_AVFORMAT)                      += lavfutils.o
@@ -47,6 +51,7 @@ OBJS-$(CONFIG_ARESAMPLE_FILTER)              += af_aresample.o
 OBJS-$(CONFIG_ASHOWINFO_FILTER)              += af_ashowinfo.o
 OBJS-$(CONFIG_ASPLIT_FILTER)                 += af_asplit.o
 OBJS-$(CONFIG_ASTREAMSYNC_FILTER)            += af_astreamsync.o
+OBJS-$(CONFIG_ASYNCTS_FILTER)                += af_asyncts.o
 OBJS-$(CONFIG_EARWAX_FILTER)                 += af_earwax.o
 OBJS-$(CONFIG_PAN_FILTER)                    += af_pan.o
 OBJS-$(CONFIG_RESAMPLE_FILTER)               += af_resample.o
diff --git a/libavfilter/af_aconvert.c b/libavfilter/af_aconvert.c
index 9d420f84e4..2b3a330e3b 100644
--- a/libavfilter/af_aconvert.c
+++ b/libavfilter/af_aconvert.c
@@ -74,6 +74,7 @@ static int query_formats(AVFilterContext *ctx)
     AVFilterLink *inlink  = ctx->inputs[0];
     AVFilterLink *outlink = ctx->outputs[0];
     int out_packing = av_sample_fmt_is_planar(aconvert->out_sample_fmt);
+    AVFilterChannelLayouts *layouts;
 
     avfilter_formats_ref(avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO),
                          &inlink->out_formats);
@@ -85,15 +86,15 @@ static int query_formats(AVFilterContext *ctx)
         avfilter_formats_ref(avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO),
                              &outlink->in_formats);
 
-    avfilter_formats_ref(avfilter_make_all_channel_layouts(),
-                         &inlink->out_chlayouts);
+    ff_channel_layouts_ref(ff_all_channel_layouts(),
+                         &inlink->out_channel_layouts);
     if (aconvert->out_chlayout != 0) {
-        formats = NULL;
-        avfilter_add_format(&formats, aconvert->out_chlayout);
-        avfilter_formats_ref(formats, &outlink->in_chlayouts);
+        layouts = NULL;
+        ff_add_channel_layout(&layouts, aconvert->out_chlayout);
+        ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
     } else
-        avfilter_formats_ref(avfilter_make_all_channel_layouts(),
-                             &outlink->in_chlayouts);
+        ff_channel_layouts_ref(ff_all_channel_layouts(),
+                             &outlink->in_channel_layouts);
 
     avfilter_formats_ref(avfilter_make_all_packing_formats(),
                          &inlink->out_packing);
diff --git a/libavfilter/af_aformat.c b/libavfilter/af_aformat.c
index 0a5857ec41..c602f5ddce 100644
--- a/libavfilter/af_aformat.c
+++ b/libavfilter/af_aformat.c
@@ -25,72 +25,110 @@
 
 #include "libavutil/audioconvert.h"
 #include "libavutil/avstring.h"
-#include "avfilter.h"
+#include "libavutil/opt.h"
+
 #include "audio.h"
+#include "avfilter.h"
+#include "formats.h"
 #include "internal.h"
 
-typedef struct {
-    AVFilterFormats *formats, *chlayouts, *packing;
+typedef struct AFormatContext {
+    const AVClass   *class;
+
+    AVFilterFormats *formats;
+    AVFilterFormats *sample_rates;
+    AVFilterChannelLayouts *channel_layouts;
+
+    char *formats_str;
+    char *sample_rates_str;
+    char *channel_layouts_str;
 } AFormatContext;
 
+#define OFFSET(x) offsetof(AFormatContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+static const AVOption options[] = {
+    { "sample_fmts",     "A comma-separated list of sample formats.",  OFFSET(formats_str),         AV_OPT_TYPE_STRING, .flags = A },
+    { "sample_rates",    "A comma-separated list of sample rates.",    OFFSET(sample_rates_str),    AV_OPT_TYPE_STRING, .flags = A },
+    { "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A },
+    { NULL },
+};
+
+static const AVClass aformat_class = {
+    .class_name = "aformat filter",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc)    \
+do {                                                                        \
+    char *next, *cur = str;                                                 \
+    while (cur) {                                                           \
+        type fmt;                                                           \
+        next = strchr(cur, ',');                                            \
+        if (next)                                                           \
+            *next++ = 0;                                                    \
+                                                                            \
+        if ((fmt = get_fmt(cur)) == none) {                                 \
+            av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
+            ret = AVERROR(EINVAL);                                          \
+            goto fail;                                                      \
+        }                                                                   \
+        add_to_list(&list, fmt);                                            \
+                                                                            \
+        cur = next;                                                         \
+    }                                                                       \
+} while (0)
+
+static int get_sample_rate(const char *samplerate)
+{
+    int ret = strtol(samplerate, NULL, 0);
+    return FFMAX(ret, 0);
+}
+
 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 {
-    AFormatContext * const aformat = ctx->priv;
-    char *fmts_str = NULL, *fmt_str, *ptr = NULL;
-    int64_t fmt;
+    AFormatContext *s = ctx->priv;
     int ret;
 
-    if (!args)
-        goto arg_fail;
-
-#define ADD_FORMATS(all_formats, fmt_name, fmt_type, fmts_list) do {    \
-    fmts_str = av_get_token(&args, ":");                                \
-    if (!fmts_str || !*fmts_str)                                        \
-        goto arg_fail;                                                  \
-    if (!strcmp(fmts_str, "all")) {                                     \
-        aformat->fmts_list = all_formats;                               \
-    } else {                                                            \
-        for (fmt_str = fmts_str;                                        \
-             fmt_str = av_strtok(fmt_str, ",", &ptr); fmt_str = NULL) { \
-            if ((ret = ff_parse_##fmt_name((fmt_type *)&fmt,            \
-                                           fmt_str, ctx)) < 0) {        \
-                av_freep(&fmts_str);                                    \
-                return ret;                                             \
-            }                                                           \
-            avfilter_add_format(&aformat->fmts_list, fmt);              \
-        }                                                               \
-    }                                                                   \
-    av_freep(&fmts_str);                                                \
-    if (*args)                                                          \
-        args++;                                                         \
-} while (0)
+    if (!args) {
+        av_log(ctx, AV_LOG_ERROR, "No parameters supplied.\n");
+        return AVERROR(EINVAL);
+    }
 
-    ADD_FORMATS(avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO), sample_format, int, formats);
-    ADD_FORMATS(avfilter_make_all_channel_layouts(), channel_layout, int64_t, chlayouts);
-    ADD_FORMATS(avfilter_make_all_packing_formats(), packing_format, int, packing);
+    s->class = &aformat_class;
+    av_opt_set_defaults(s);
 
-    return 0;
+    if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", args);
+        return ret;
+    }
 
-arg_fail:
-    av_log(ctx, AV_LOG_ERROR, "Invalid arguments, they must be of the form "
-                              "sample_fmts:channel_layouts:packing_fmts\n");
-    av_freep(&fmts_str);
-    return AVERROR(EINVAL);
+    PARSE_FORMATS(s->formats_str, enum AVSampleFormat, s->formats,
+                  avfilter_add_format, av_get_sample_fmt, AV_SAMPLE_FMT_NONE, "sample format");
+    PARSE_FORMATS(s->sample_rates_str, int, s->sample_rates, avfilter_add_format,
+                  get_sample_rate, 0, "sample rate");
+    PARSE_FORMATS(s->channel_layouts_str, uint64_t, s->channel_layouts,
+                  ff_add_channel_layout, av_get_channel_layout, 0,
+                  "channel layout");
+
+fail:
+    av_opt_free(s);
+    return ret;
 }
 
 static int query_formats(AVFilterContext *ctx)
 {
-    AFormatContext * const aformat = ctx->priv;
+    AFormatContext *s = ctx->priv;
 
-    avfilter_set_common_sample_formats (ctx, aformat->formats);
-    avfilter_set_common_channel_layouts(ctx, aformat->chlayouts);
-    avfilter_set_common_packing_formats(ctx, aformat->packing);
-    return 0;
-}
+    avfilter_set_common_formats(ctx, s->formats ? s->formats :
+                                                  avfilter_all_formats(AVMEDIA_TYPE_AUDIO));
+    ff_set_common_samplerates(ctx, s->sample_rates ? s->sample_rates :
+                                                     ff_all_samplerates());
+    ff_set_common_channel_layouts(ctx, s->channel_layouts ? s->channel_layouts :
+                                                            ff_all_channel_layouts());
 
-static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamplesref)
-{
-    ff_filter_samples(inlink->dst->outputs[0], insamplesref);
+    return 0;
 }
 
 AVFilter avfilter_af_aformat = {
@@ -100,11 +138,11 @@ AVFilter avfilter_af_aformat = {
     .query_formats = query_formats,
     .priv_size     = sizeof(AFormatContext),
 
-    .inputs        = (const AVFilterPad[]) {{ .name      = "default",
+    .inputs        = (AVFilterPad[]) {{ .name            = "default",
                                         .type            = AVMEDIA_TYPE_AUDIO,
-                                        .filter_samples  = filter_samples},
+                                        .filter_samples  = ff_null_filter_samples },
                                       { .name = NULL}},
-    .outputs       = (const AVFilterPad[]) {{ .name      = "default",
+    .outputs       = (AVFilterPad[]) {{ .name            = "default",
                                         .type            = AVMEDIA_TYPE_AUDIO},
                                       { .name = NULL}},
 };
diff --git a/libavfilter/af_amerge.c b/libavfilter/af_amerge.c
index faa64e1977..fcc1089d6f 100644
--- a/libavfilter/af_amerge.c
+++ b/libavfilter/af_amerge.c
@@ -56,17 +56,18 @@ static int query_formats(AVFilterContext *ctx)
     int64_t inlayout[2], outlayout;
     const int packing_fmts[] = { AVFILTER_PACKED, -1 };
     AVFilterFormats *formats;
+    AVFilterChannelLayouts *layouts;
     int i;
 
     for (i = 0; i < 2; i++) {
-        if (!ctx->inputs[i]->in_chlayouts ||
-            !ctx->inputs[i]->in_chlayouts->format_count) {
+        if (!ctx->inputs[i]->in_channel_layouts ||
+            !ctx->inputs[i]->in_channel_layouts->nb_channel_layouts) {
             av_log(ctx, AV_LOG_ERROR,
                    "No channel layout for input %d\n", i + 1);
             return AVERROR(EINVAL);
         }
-        inlayout[i] = ctx->inputs[i]->in_chlayouts->formats[0];
-        if (ctx->inputs[i]->in_chlayouts->format_count > 1) {
+        inlayout[i] = ctx->inputs[i]->in_channel_layouts->channel_layouts[0];
+        if (ctx->inputs[i]->in_channel_layouts->nb_channel_layouts > 1) {
             char buf[256];
             av_get_channel_layout_string(buf, sizeof(buf), 0, inlayout[i]);
             av_log(ctx, AV_LOG_INFO, "Using \"%s\" for input %d\n", buf, i + 1);
@@ -101,13 +102,13 @@ static int query_formats(AVFilterContext *ctx)
     formats = avfilter_make_format_list(packing_fmts);
     avfilter_set_common_packing_formats(ctx, formats);
     for (i = 0; i < 2; i++) {
-        formats = NULL;
-        avfilter_add_format(&formats, inlayout[i]);
-        avfilter_formats_ref(formats, &ctx->inputs[i]->out_chlayouts);
+        layouts = NULL;
+        ff_add_channel_layout(&layouts, inlayout[i]);
+        ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);
     }
-    formats = NULL;
-    avfilter_add_format(&formats, outlayout);
-    avfilter_formats_ref(formats, &ctx->outputs[0]->in_chlayouts);
+    layouts = NULL;
+    ff_add_channel_layout(&layouts, outlayout);
+    ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts);
     return 0;
 }
 
diff --git a/libavfilter/af_aresample.c b/libavfilter/af_aresample.c
index a2980d90cd..521ccf7f8d 100644
--- a/libavfilter/af_aresample.c
+++ b/libavfilter/af_aresample.c
@@ -56,6 +56,42 @@ static av_cold void uninit(AVFilterContext *ctx)
     swr_free(&aresample->swr);
 }
 
+static int query_formats(AVFilterContext *ctx)
+{
+    AResampleContext *aresample = ctx->priv;
+
+    AVFilterLink *inlink  = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+
+    AVFilterFormats        *in_formats      = avfilter_all_formats(AVMEDIA_TYPE_AUDIO);
+    AVFilterFormats        *out_formats     = avfilter_all_formats(AVMEDIA_TYPE_AUDIO);
+    AVFilterFormats        *in_samplerates  = ff_all_samplerates();
+    AVFilterFormats        *out_samplerates;
+
+
+    AVFilterChannelLayouts *in_layouts      = ff_all_channel_layouts();
+    AVFilterChannelLayouts *out_layouts     = ff_all_channel_layouts();
+
+    avfilter_formats_ref(in_formats,  &inlink->out_formats);
+    avfilter_formats_ref(out_formats, &outlink->in_formats);
+
+    avfilter_formats_ref(in_samplerates,  &inlink->out_samplerates);
+
+    ff_channel_layouts_ref(in_layouts,  &inlink->out_channel_layouts);
+    ff_channel_layouts_ref(out_layouts, &outlink->in_channel_layouts);
+
+    if(aresample->out_rate > 0) {
+        int sample_rates[] = { aresample->out_rate, -1 };
+        ff_set_common_samplerates(ctx, avfilter_make_format_list(sample_rates));
+    } else {
+        out_samplerates = ff_all_samplerates();
+        avfilter_formats_ref(out_samplerates, &outlink->in_samplerates);
+    }
+
+    return 0;
+}
+
+
 static int config_output(AVFilterLink *outlink)
 {
     int ret;
@@ -113,6 +149,7 @@ AVFilter avfilter_af_aresample = {
     .description   = NULL_IF_CONFIG_SMALL("Resample audio data."),
     .init          = init,
     .uninit        = uninit,
+    .query_formats = query_formats,
     .priv_size     = sizeof(AResampleContext),
 
     .inputs    = (const AVFilterPad[]) {{ .name      = "default",
diff --git a/libavfilter/af_astreamsync.c b/libavfilter/af_astreamsync.c
index faa3b7ce8a..9f040238d9 100644
--- a/libavfilter/af_astreamsync.c
+++ b/libavfilter/af_astreamsync.c
@@ -81,6 +81,7 @@ static int query_formats(AVFilterContext *ctx)
 {
     int i;
     AVFilterFormats *formats;
+    AVFilterChannelLayouts *layouts;
 
     for (i = 0; i < 2; i++) {
         formats = ctx->inputs[i]->in_formats;
@@ -89,9 +90,9 @@ static int query_formats(AVFilterContext *ctx)
         formats = ctx->inputs[i]->in_packing;
         avfilter_formats_ref(formats, &ctx->inputs[i]->out_packing);
         avfilter_formats_ref(formats, &ctx->outputs[i]->in_packing);
-        formats = ctx->inputs[i]->in_chlayouts;
-        avfilter_formats_ref(formats, &ctx->inputs[i]->out_chlayouts);
-        avfilter_formats_ref(formats, &ctx->outputs[i]->in_chlayouts);
+        layouts = ctx->inputs[i]->in_channel_layouts;
+        ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts);
+        ff_channel_layouts_ref(layouts, &ctx->outputs[i]->in_channel_layouts);
     }
     return 0;
 }
diff --git a/libavfilter/af_asyncts.c b/libavfilter/af_asyncts.c
new file mode 100644
index 0000000000..5cde0bf00a
--- /dev/null
+++ b/libavfilter/af_asyncts.c
@@ -0,0 +1,237 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavresample/avresample.h"
+#include "libavutil/audio_fifo.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "libavutil/samplefmt.h"
+
+#include "audio.h"
+#include "avfilter.h"
+
+typedef struct ASyncContext {
+    const AVClass *class;
+
+    AVAudioResampleContext *avr;
+    int64_t pts;            ///< timestamp in samples of the first sample in fifo
+    int min_delta;          ///< pad/trim min threshold in samples
+
+    /* options */
+    int resample;
+    float min_delta_sec;
+    int max_comp;
+} ASyncContext;
+
+#define OFFSET(x) offsetof(ASyncContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+static const AVOption options[] = {
+    { "compensate", "Stretch/squeeze the data to make it match the timestamps", OFFSET(resample),      AV_OPT_TYPE_INT,   { 0 },   0, 1,       A },
+    { "min_delta",  "Minimum difference between timestamps and audio data "
+                    "(in seconds) to trigger padding/trimmin the data.",        OFFSET(min_delta_sec), AV_OPT_TYPE_FLOAT, { 0.1 }, 0, INT_MAX, A },
+    { "max_comp",   "Maximum compensation in samples per second.",              OFFSET(max_comp),      AV_OPT_TYPE_INT,   { 500 }, 0, INT_MAX, A },
+    { NULL },
+};
+
+static const AVClass async_class = {
+    .class_name = "asyncts filter",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    ASyncContext *s = ctx->priv;
+    int ret;
+
+    s->class = &async_class;
+    av_opt_set_defaults(s);
+
+    if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Error parsing options string '%s'.\n", args);
+        return ret;
+    }
+    av_opt_free(s);
+
+    s->pts = AV_NOPTS_VALUE;
+
+    return 0;
+}
+
+static void uninit(AVFilterContext *ctx)
+{
+    ASyncContext *s = ctx->priv;
+
+    if (s->avr) {
+        avresample_close(s->avr);
+        avresample_free(&s->avr);
+    }
+}
+
+static int config_props(AVFilterLink *link)
+{
+    ASyncContext *s = link->src->priv;
+    int ret;
+
+    s->min_delta = s->min_delta_sec * link->sample_rate;
+    link->time_base = (AVRational){1, link->sample_rate};
+
+    s->avr = avresample_alloc_context();
+    if (!s->avr)
+        return AVERROR(ENOMEM);
+
+    av_opt_set_int(s->avr,  "in_channel_layout", link->channel_layout, 0);
+    av_opt_set_int(s->avr, "out_channel_layout", link->channel_layout, 0);
+    av_opt_set_int(s->avr,  "in_sample_fmt",     link->format,         0);
+    av_opt_set_int(s->avr, "out_sample_fmt",     link->format,         0);
+    av_opt_set_int(s->avr,  "in_sample_rate",    link->sample_rate,    0);
+    av_opt_set_int(s->avr, "out_sample_rate",    link->sample_rate,    0);
+
+    if (s->resample)
+        av_opt_set_int(s->avr, "force_resampling", 1, 0);
+
+    if ((ret = avresample_open(s->avr)) < 0)
+        return ret;
+
+    return 0;
+}
+
+static int request_frame(AVFilterLink *link)
+{
+    AVFilterContext *ctx = link->src;
+    ASyncContext      *s = ctx->priv;
+    int ret = avfilter_request_frame(ctx->inputs[0]);
+    int nb_samples;
+
+    /* flush the fifo */
+    if (ret == AVERROR_EOF && (nb_samples = avresample_get_delay(s->avr))) {
+        AVFilterBufferRef *buf = ff_get_audio_buffer(link, AV_PERM_WRITE,
+                                                     nb_samples);
+        if (!buf)
+            return AVERROR(ENOMEM);
+        avresample_convert(s->avr, (void**)buf->extended_data, buf->linesize[0],
+                           nb_samples, NULL, 0, 0);
+        buf->pts = s->pts;
+        ff_filter_samples(link, buf);
+        return 0;
+    }
+
+    return ret;
+}
+
+static void write_to_fifo(ASyncContext *s, AVFilterBufferRef *buf)
+{
+    avresample_convert(s->avr, NULL, 0, 0, (void**)buf->extended_data,
+                       buf->linesize[0], buf->audio->nb_samples);
+    avfilter_unref_buffer(buf);
+}
+
+/* get amount of data currently buffered, in samples */
+static int64_t get_delay(ASyncContext *s)
+{
+    return avresample_available(s->avr) + avresample_get_delay(s->avr);
+}
+
+static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *buf)
+{
+    AVFilterContext  *ctx = inlink->dst;
+    ASyncContext       *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    int nb_channels = av_get_channel_layout_nb_channels(buf->audio->channel_layout);
+    int64_t pts = (buf->pts == AV_NOPTS_VALUE) ? buf->pts :
+                  av_rescale_q(buf->pts, inlink->time_base, outlink->time_base);
+    int out_size;
+    int64_t delta;
+
+    /* buffer data until we get the first timestamp */
+    if (s->pts == AV_NOPTS_VALUE) {
+        if (pts != AV_NOPTS_VALUE) {
+            s->pts = pts - get_delay(s);
+        }
+        write_to_fifo(s, buf);
+        return;
+    }
+
+    /* now wait for the next timestamp */
+    if (pts == AV_NOPTS_VALUE) {
+        write_to_fifo(s, buf);
+        return;
+    }
+
+    /* when we have two timestamps, compute how many samples would we have
+     * to add/remove to get proper sync between data and timestamps */
+    delta    = pts - s->pts - get_delay(s);
+    out_size = avresample_available(s->avr);
+
+    if (labs(delta) > s->min_delta) {
+        av_log(ctx, AV_LOG_VERBOSE, "Discontinuity - %"PRId64" samples.\n", delta);
+        out_size += delta;
+    } else if (s->resample) {
+        int comp = av_clip(delta, -s->max_comp, s->max_comp);
+        av_log(ctx, AV_LOG_VERBOSE, "Compensating %d samples per second.\n", comp);
+        avresample_set_compensation(s->avr, delta, inlink->sample_rate);
+    }
+
+    if (out_size > 0) {
+        AVFilterBufferRef *buf_out = ff_get_audio_buffer(outlink, AV_PERM_WRITE,
+                                                         out_size);
+        if (!buf_out)
+            return;
+
+        avresample_read(s->avr, (void**)buf_out->extended_data, out_size);
+        buf_out->pts = s->pts;
+
+        if (delta > 0) {
+            av_samples_set_silence(buf_out->extended_data, out_size - delta,
+                                   delta, nb_channels, buf->format);
+        }
+        ff_filter_samples(outlink, buf_out);
+    } else {
+        av_log(ctx, AV_LOG_WARNING, "Non-monotonous timestamps, dropping "
+               "whole buffer.\n");
+    }
+
+    /* drain any remaining buffered data */
+    avresample_read(s->avr, NULL, avresample_available(s->avr));
+
+    s->pts = pts - avresample_get_delay(s->avr);
+    avresample_convert(s->avr, NULL, 0, 0, (void**)buf->extended_data,
+                       buf->linesize[0], buf->audio->nb_samples);
+    avfilter_unref_buffer(buf);
+}
+
+AVFilter avfilter_af_asyncts = {
+    .name        = "asyncts",
+    .description = NULL_IF_CONFIG_SMALL("Sync audio data to timestamps"),
+
+    .init        = init,
+    .uninit      = uninit,
+
+    .priv_size   = sizeof(ASyncContext),
+
+    .inputs      = (const AVFilterPad[]) {{ .name           = "default",
+                                            .type           = AVMEDIA_TYPE_AUDIO,
+                                            .filter_samples = filter_samples },
+                                          { NULL }},
+    .outputs     = (const AVFilterPad[]) {{ .name           = "default",
+                                            .type           = AVMEDIA_TYPE_AUDIO,
+                                            .config_props   = config_props,
+                                            .request_frame  = request_frame },
+                                          { NULL }},
+};
diff --git a/libavfilter/af_earwax.c b/libavfilter/af_earwax.c
index 6afed72182..2ab248f390 100644
--- a/libavfilter/af_earwax.c
+++ b/libavfilter/af_earwax.c
@@ -32,6 +32,7 @@
 #include "libavutil/audioconvert.h"
 #include "avfilter.h"
 #include "audio.h"
+#include "formats.h"
 
 #define NUMTAPS 64
 
@@ -76,15 +77,19 @@ typedef struct {
 
 static int query_formats(AVFilterContext *ctx)
 {
+    int sample_rates[] = { 44100, -1 };
+
     AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layout = NULL;
+
     avfilter_add_format(&formats, AV_SAMPLE_FMT_S16);
     avfilter_set_common_sample_formats(ctx, formats);
-    formats = NULL;
-    avfilter_add_format(&formats, AV_CH_LAYOUT_STEREO);
-    avfilter_set_common_channel_layouts(ctx, formats);
+    ff_add_channel_layout(&layout, AV_CH_LAYOUT_STEREO);
+    ff_set_common_channel_layouts(ctx, layout);
     formats = NULL;
     avfilter_add_format(&formats, AVFILTER_PACKED);
     avfilter_set_common_packing_formats(ctx, formats);
+    ff_set_common_samplerates(ctx, avfilter_make_format_list(sample_rates));
 
     return 0;
 }
diff --git a/libavfilter/af_pan.c b/libavfilter/af_pan.c
index fd65aac58c..3100a14881 100644
--- a/libavfilter/af_pan.c
+++ b/libavfilter/af_pan.c
@@ -33,6 +33,7 @@
 #include "libswresample/swresample.h"
 #include "audio.h"
 #include "avfilter.h"
+#include "formats.h"
 
 #define MAX_CHANNELS 63
 
@@ -212,7 +213,7 @@ static int query_formats(AVFilterContext *ctx)
     PanContext *pan = ctx->priv;
     AVFilterLink *inlink  = ctx->inputs[0];
     AVFilterLink *outlink = ctx->outputs[0];
-    AVFilterFormats *formats;
+    AVFilterChannelLayouts *layouts;
 
     pan->pure_gains = are_gains_pure(pan);
     /* libswr supports any sample and packing formats */
@@ -220,13 +221,13 @@ static int query_formats(AVFilterContext *ctx)
     avfilter_set_common_packing_formats(ctx, avfilter_make_all_packing_formats());
 
     // inlink supports any channel layout
-    formats = avfilter_make_all_channel_layouts();
-    avfilter_formats_ref(formats, &inlink->out_chlayouts);
+    layouts = ff_all_channel_layouts();
+    ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
 
     // outlink supports only requested output channel layout
-    formats = NULL;
-    avfilter_add_format(&formats, pan->out_channel_layout);
-    avfilter_formats_ref(formats, &outlink->in_chlayouts);
+    layouts = NULL;
+    ff_add_channel_layout(&layouts, pan->out_channel_layout);
+    ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts);
     return 0;
 }
 
diff --git a/libavfilter/af_resample.c b/libavfilter/af_resample.c
index f46e24b1b6..4ad5a8c38e 100644
--- a/libavfilter/af_resample.c
+++ b/libavfilter/af_resample.c
@@ -31,6 +31,7 @@
 
 #include "audio.h"
 #include "avfilter.h"
+#include "formats.h"
 #include "internal.h"
 
 typedef struct ResampleContext {
@@ -56,10 +57,20 @@ static int query_formats(AVFilterContext *ctx)
 
     AVFilterFormats        *in_formats      = avfilter_all_formats(AVMEDIA_TYPE_AUDIO);
     AVFilterFormats        *out_formats     = avfilter_all_formats(AVMEDIA_TYPE_AUDIO);
+    AVFilterFormats        *in_samplerates  = ff_all_samplerates();
+    AVFilterFormats        *out_samplerates = ff_all_samplerates();
+    AVFilterChannelLayouts *in_layouts      = ff_all_channel_layouts();
+    AVFilterChannelLayouts *out_layouts     = ff_all_channel_layouts();
 
     avfilter_formats_ref(in_formats,  &inlink->out_formats);
     avfilter_formats_ref(out_formats, &outlink->in_formats);
 
+    avfilter_formats_ref(in_samplerates,  &inlink->out_samplerates);
+    avfilter_formats_ref(out_samplerates, &outlink->in_samplerates);
+
+    ff_channel_layouts_ref(in_layouts,  &inlink->out_channel_layouts);
+    ff_channel_layouts_ref(out_layouts, &outlink->in_channel_layouts);
+
     return 0;
 }
 
diff --git a/libavfilter/af_silencedetect.c b/libavfilter/af_silencedetect.c
index 093ca2b21f..4f5d8e0dd4 100644
--- a/libavfilter/af_silencedetect.c
+++ b/libavfilter/af_silencedetect.c
@@ -26,6 +26,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/timestamp.h"
 #include "audio.h"
+#include "formats.h"
 #include "avfilter.h"
 
 typedef struct {
@@ -130,16 +131,17 @@ static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
     enum AVSampleFormat sample_fmts[] = {
         AV_SAMPLE_FMT_DBL,
         AV_SAMPLE_FMT_NONE
     };
     int packing_fmts[] = { AVFILTER_PACKED, -1 };
 
-    formats = avfilter_make_all_channel_layouts();
-    if (!formats)
+    layouts = ff_all_channel_layouts();
+    if (!layouts)
         return AVERROR(ENOMEM);
-    avfilter_set_common_channel_layouts(ctx, formats);
+    ff_set_common_channel_layouts(ctx, layouts);
 
     formats = avfilter_make_format_list(sample_fmts);
     if (!formats)
@@ -151,6 +153,11 @@ static int query_formats(AVFilterContext *ctx)
         return AVERROR(ENOMEM);
     avfilter_set_common_packing_formats(ctx, formats);
 
+    formats = ff_all_samplerates();
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_set_common_samplerates(ctx, formats);
+
     return 0;
 }
 
diff --git a/libavfilter/af_volume.c b/libavfilter/af_volume.c
index 8e2e37e730..50f3cbd002 100644
--- a/libavfilter/af_volume.c
+++ b/libavfilter/af_volume.c
@@ -28,6 +28,7 @@
 #include "libavutil/eval.h"
 #include "audio.h"
 #include "avfilter.h"
+#include "formats.h"
 
 typedef struct {
     double volume;
@@ -81,6 +82,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts;
     enum AVSampleFormat sample_fmts[] = {
         AV_SAMPLE_FMT_U8,
         AV_SAMPLE_FMT_S16,
@@ -91,10 +93,10 @@ static int query_formats(AVFilterContext *ctx)
     };
     int packing_fmts[] = { AVFILTER_PACKED, -1 };
 
-    formats = avfilter_make_all_channel_layouts();
-    if (!formats)
+    layouts = ff_all_channel_layouts();
+    if (!layouts)
         return AVERROR(ENOMEM);
-    avfilter_set_common_channel_layouts(ctx, formats);
+    ff_set_common_channel_layouts(ctx, layouts);
 
     formats = avfilter_make_format_list(sample_fmts);
     if (!formats)
@@ -106,6 +108,11 @@ static int query_formats(AVFilterContext *ctx)
         return AVERROR(ENOMEM);
     avfilter_set_common_packing_formats(ctx, formats);
 
+    formats = ff_all_samplerates();
+    if (!formats)
+        return AVERROR(ENOMEM);
+    ff_set_common_samplerates(ctx, formats);
+
     return 0;
 }
 
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 4e4c5d37f4..29cd3e3402 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -42,13 +42,13 @@ void avfilter_register_all(void)
     REGISTER_FILTER (ASHOWINFO,   ashowinfo,   af);
     REGISTER_FILTER (ASPLIT,      asplit,      af);
     REGISTER_FILTER (ASTREAMSYNC, astreamsync, af);
+    REGISTER_FILTER (ASYNCTS,     asyncts,     af);
     REGISTER_FILTER (EARWAX,      earwax,      af);
     REGISTER_FILTER (PAN,         pan,         af);
     REGISTER_FILTER (SILENCEDETECT, silencedetect, af);
     REGISTER_FILTER (VOLUME,      volume,      af);
     REGISTER_FILTER (RESAMPLE,    resample,    af);
 
-    REGISTER_FILTER (ABUFFER,     abuffer,     asrc);
     REGISTER_FILTER (AEVALSRC,    aevalsrc,    asrc);
     REGISTER_FILTER (AMOVIE,      amovie,      asrc);
     REGISTER_FILTER (ANULLSRC,    anullsrc,    asrc);
@@ -130,10 +130,18 @@ void avfilter_register_all(void)
         avfilter_register(&avfilter_vsrc_buffer);
     }
     {
+        extern AVFilter avfilter_asrc_abuffer;
+        avfilter_register(&avfilter_asrc_abuffer);
+    }
+    {
         extern AVFilter avfilter_vsink_buffer;
         avfilter_register(&avfilter_vsink_buffer);
     }
     {
+        extern AVFilter avfilter_asink_abuffer;
+        avfilter_register(&avfilter_asink_abuffer);
+    }
+    {
         extern AVFilter avfilter_vf_scale;
         avfilter_register(&avfilter_vf_scale);
     }
diff --git a/libavfilter/asrc_aevalsrc.c b/libavfilter/asrc_aevalsrc.c
index 4abcbc46aa..94197b2fd8 100644
--- a/libavfilter/asrc_aevalsrc.c
+++ b/libavfilter/asrc_aevalsrc.c
@@ -190,7 +190,7 @@ static int query_formats(AVFilterContext *ctx)
     int packing_fmts[] = { AVFILTER_PLANAR, -1 };
 
     avfilter_set_common_sample_formats (ctx, avfilter_make_format_list(sample_fmts));
-    avfilter_set_common_channel_layouts(ctx, avfilter_make_format64_list(chlayouts));
+    ff_set_common_channel_layouts(ctx, avfilter_make_format64_list(chlayouts));
     avfilter_set_common_packing_formats(ctx, avfilter_make_format_list(packing_fmts));
 
     return 0;
diff --git a/libavfilter/avcodec.c b/libavfilter/avcodec.c
index d4c92f98cc..ce003abaa0 100644
--- a/libavfilter/avcodec.c
+++ b/libavfilter/avcodec.c
@@ -24,77 +24,6 @@
 #include "avcodec.h"
 #include "libavutil/opt.h"
 
-int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
-{
-    dst->pts    = src->pts;
-    dst->pos    = src->pkt_pos;
-    dst->format = src->format;
-
-    switch (dst->type) {
-    case AVMEDIA_TYPE_VIDEO:
-        dst->video->w                   = src->width;
-        dst->video->h                   = src->height;
-        dst->video->sample_aspect_ratio = src->sample_aspect_ratio;
-        dst->video->interlaced          = src->interlaced_frame;
-        dst->video->top_field_first     = src->top_field_first;
-        dst->video->key_frame           = src->key_frame;
-        dst->video->pict_type           = src->pict_type;
-        break;
-    case AVMEDIA_TYPE_AUDIO:
-        dst->audio->sample_rate         = src->sample_rate;
-        dst->audio->channel_layout      = src->channel_layout;
-        break;
-    default:
-        return AVERROR(EINVAL);
-    }
-
-    return 0;
-}
-
-int avfilter_copy_buf_props(AVFrame *dst, const AVFilterBufferRef *src)
-{
-    int planes, nb_channels;
-
-    memcpy(dst->data, src->data, sizeof(dst->data));
-    memcpy(dst->linesize, src->linesize, sizeof(dst->linesize));
-
-    dst->pts     = src->pts;
-    dst->format  = src->format;
-
-    switch (src->type) {
-    case AVMEDIA_TYPE_VIDEO:
-        dst->width               = src->video->w;
-        dst->height              = src->video->h;
-        dst->sample_aspect_ratio = src->video->sample_aspect_ratio;
-        dst->interlaced_frame    = src->video->interlaced;
-        dst->top_field_first     = src->video->top_field_first;
-        dst->key_frame           = src->video->key_frame;
-        dst->pict_type           = src->video->pict_type;
-        break;
-    case AVMEDIA_TYPE_AUDIO:
-        nb_channels = av_get_channel_layout_nb_channels(src->audio->channel_layout);
-        planes      = av_sample_fmt_is_planar(src->format) ? nb_channels : 1;
-
-        if (planes > FF_ARRAY_ELEMS(dst->data)) {
-            dst->extended_data = av_mallocz(planes * sizeof(*dst->extended_data));
-            if (!dst->extended_data)
-                return AVERROR(ENOMEM);
-            memcpy(dst->extended_data, src->extended_data,
-                   planes * sizeof(dst->extended_data));
-        } else
-            dst->extended_data = dst->data;
-
-        dst->sample_rate         = src->audio->sample_rate;
-        dst->channel_layout      = src->audio->channel_layout;
-        dst->nb_samples          = src->audio->nb_samples;
-        break;
-    default:
-        return AVERROR(EINVAL);
-    }
-
-    return 0;
-}
-
 AVFilterBufferRef *avfilter_get_video_buffer_ref_from_frame(const AVFrame *frame,
                                                             int perms)
 {
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 4354f8ca03..9704dc0a96 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -24,11 +24,11 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/rational.h"
 #include "libavutil/audioconvert.h"
-#include "libavutil/imgutils.h"
 #include "libavutil/avassert.h"
 #include "libavutil/avstring.h"
 
 #include "avfilter.h"
+#include "formats.h"
 #include "internal.h"
 
 unsigned avfilter_version(void) {
@@ -47,7 +47,7 @@ const char *avfilter_license(void)
     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
 }
 
-static void command_queue_pop(AVFilterContext *filter)
+void ff_command_queue_pop(AVFilterContext *filter)
 {
     AVFilterCommand *c= filter->command_queue;
     av_freep(&c->arg);
@@ -56,133 +56,6 @@ static void command_queue_pop(AVFilterContext *filter)
     av_free(c);
 }
 
-AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
-{
-    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
-    if (!ret)
-        return NULL;
-    *ret = *ref;
-    if (ref->type == AVMEDIA_TYPE_VIDEO) {
-        ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
-        if (!ret->video) {
-            av_free(ret);
-            return NULL;
-        }
-        *ret->video = *ref->video;
-        ret->extended_data = ret->data;
-    } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
-        ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
-        if (!ret->audio) {
-            av_free(ret);
-            return NULL;
-        }
-        *ret->audio = *ref->audio;
-
-        if (ref->extended_data && ref->extended_data != ref->data) {
-            int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
-            if (!(ret->extended_data = av_malloc(sizeof(*ret->extended_data) *
-                                                 nb_channels))) {
-                av_freep(&ret->audio);
-                av_freep(&ret);
-                return NULL;
-            }
-            memcpy(ret->extended_data, ref->extended_data,
-                   sizeof(*ret->extended_data) * nb_channels);
-        } else
-            ret->extended_data = ret->data;
-    }
-    ret->perms &= pmask;
-    ret->buf->refcount ++;
-    return ret;
-}
-
-static void free_pool(AVFilterPool *pool)
-{
-    int i;
-
-    av_assert0(pool->refcount > 0);
-
-    for (i = 0; i < POOL_SIZE; i++) {
-        if (pool->pic[i]) {
-            AVFilterBufferRef *picref = pool->pic[i];
-            /* free buffer: picrefs stored in the pool are not
-             * supposed to contain a free callback */
-            av_assert0(!picref->buf->refcount);
-            av_freep(&picref->buf->data[0]);
-            av_freep(&picref->buf);
-
-            av_freep(&picref->audio);
-            av_freep(&picref->video);
-            av_freep(&pool->pic[i]);
-            pool->count--;
-        }
-    }
-    pool->draining = 1;
-
-    if (!--pool->refcount) {
-        av_assert0(!pool->count);
-        av_free(pool);
-    }
-}
-
-static void store_in_pool(AVFilterBufferRef *ref)
-{
-    int i;
-    AVFilterPool *pool= ref->buf->priv;
-
-    av_assert0(ref->buf->data[0]);
-    av_assert0(pool->refcount>0);
-
-    if (pool->count == POOL_SIZE) {
-        AVFilterBufferRef *ref1 = pool->pic[0];
-        av_freep(&ref1->video);
-        av_freep(&ref1->audio);
-        av_freep(&ref1->buf->data[0]);
-        av_freep(&ref1->buf);
-        av_free(ref1);
-        memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
-        pool->count--;
-        pool->pic[POOL_SIZE-1] = NULL;
-    }
-
-    for (i = 0; i < POOL_SIZE; i++) {
-        if (!pool->pic[i]) {
-            pool->pic[i] = ref;
-            pool->count++;
-            break;
-        }
-    }
-    if (pool->draining) {
-        free_pool(pool);
-    } else
-        --pool->refcount;
-}
-
-void avfilter_unref_buffer(AVFilterBufferRef *ref)
-{
-    if (!ref)
-        return;
-    av_assert0(ref->buf->refcount > 0);
-    if (!(--ref->buf->refcount)) {
-        if (!ref->buf->free) {
-            store_in_pool(ref);
-            return;
-        }
-        ref->buf->free(ref->buf);
-    }
-    if (ref->extended_data != ref->data)
-        av_freep(&ref->extended_data);
-    av_freep(&ref->video);
-    av_freep(&ref->audio);
-    av_free(ref);
-}
-
-void avfilter_unref_bufferp(AVFilterBufferRef **ref)
-{
-    avfilter_unref_buffer(*ref);
-    *ref = NULL;
-}
-
 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                          AVFilterPad **pads, AVFilterLink ***links,
                          AVFilterPad *newpad)
@@ -240,7 +113,7 @@ void avfilter_link_free(AVFilterLink **link)
         return;
 
     if ((*link)->pool)
-        free_pool((*link)->pool);
+        ff_free_pool((*link)->pool);
 
     av_freep(link);
 }
@@ -272,12 +145,15 @@ int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
     if (link->out_formats)
         avfilter_formats_changeref(&link->out_formats,
                                    &filt->outputs[filt_dstpad_idx]->out_formats);
-    if (link->out_chlayouts)
-        avfilter_formats_changeref(&link->out_chlayouts,
-                                   &filt->outputs[filt_dstpad_idx]->out_chlayouts);
+    if (link->out_channel_layouts)
+        ff_channel_layouts_changeref(&link->out_channel_layouts,
+                                     &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
     if (link->out_packing)
         avfilter_formats_changeref(&link->out_packing,
                                    &filt->outputs[filt_dstpad_idx]->out_packing);
+    if (link->out_samplerates)
+        avfilter_formats_changeref(&link->out_samplerates,
+                                   &filt->outputs[filt_dstpad_idx]->out_samplerates);
 
     return 0;
 }
@@ -329,6 +205,7 @@ int avfilter_config_links(AVFilterContext *filter)
                     link->sample_aspect_ratio = inlink ?
                         inlink->sample_aspect_ratio : (AVRational){1,1};
 
+#if 1
                 if (inlink) {
                     if (!link->w)
                         link->w = inlink->w;
@@ -359,6 +236,7 @@ int avfilter_config_links(AVFilterContext *filter)
                     link->time_base = (AVRational) {1, link->sample_rate};
             }
 
+#endif
             if ((config_link = link->dstpad->config_props))
                 if ((ret = config_link(link)) < 0)
                     return ret;
@@ -370,47 +248,6 @@ int avfilter_config_links(AVFilterContext *filter)
     return 0;
 }
 
-static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
-{
-    snprintf(buf, buf_size, "%s%s%s%s%s%s",
-             perms & AV_PERM_READ      ? "r" : "",
-             perms & AV_PERM_WRITE     ? "w" : "",
-             perms & AV_PERM_PRESERVE  ? "p" : "",
-             perms & AV_PERM_REUSE     ? "u" : "",
-             perms & AV_PERM_REUSE2    ? "U" : "",
-             perms & AV_PERM_NEG_LINESIZES ? "n" : "");
-    return buf;
-}
-
-static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
-{
-    av_unused char buf[16];
-    av_dlog(ctx,
-            "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
-            ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
-            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
-            ref->pts, ref->pos);
-
-    if (ref->video) {
-        av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
-                ref->video->sample_aspect_ratio.num, ref->video->sample_aspect_ratio.den,
-                ref->video->w, ref->video->h,
-                !ref->video->interlaced     ? 'P' :         /* Progressive  */
-                ref->video->top_field_first ? 'T' : 'B',    /* Top / Bottom */
-                ref->video->key_frame,
-                av_get_picture_type_char(ref->video->pict_type));
-    }
-    if (ref->audio) {
-        av_dlog(ctx, " cl:%"PRId64"d n:%d r:%d p:%d",
-                ref->audio->channel_layout,
-                ref->audio->nb_samples,
-                ref->audio->sample_rate,
-                ref->audio->planar);
-    }
-
-    av_dlog(ctx, "]%s", end ? "\n" : "");
-}
-
 void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
 {
     if (link->type == AVMEDIA_TYPE_VIDEO) {
@@ -435,71 +272,6 @@ void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
     }
 }
 
-AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
-{
-    AVFilterBufferRef *ret = NULL;
-
-    av_unused char buf[16];
-    FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
-    av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
-
-    if (link->dstpad->get_video_buffer)
-        ret = link->dstpad->get_video_buffer(link, perms, w, h);
-
-    if (!ret)
-        ret = avfilter_default_get_video_buffer(link, perms, w, h);
-
-    if (ret)
-        ret->type = AVMEDIA_TYPE_VIDEO;
-
-    FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
-
-    return ret;
-}
-
-AVFilterBufferRef *
-avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
-                                          int w, int h, enum PixelFormat format)
-{
-    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
-    AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
-
-    if (!pic || !picref)
-        goto fail;
-
-    picref->buf = pic;
-    picref->buf->free = ff_avfilter_default_free_buffer;
-    if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
-        goto fail;
-
-    pic->w = picref->video->w = w;
-    pic->h = picref->video->h = h;
-
-    /* make sure the buffer gets read permission or it's useless for output */
-    picref->perms = perms | AV_PERM_READ;
-
-    pic->refcount = 1;
-    picref->type = AVMEDIA_TYPE_VIDEO;
-    pic->format = picref->format = format;
-
-    memcpy(pic->data,        data,          4*sizeof(data[0]));
-    memcpy(pic->linesize,    linesize,      4*sizeof(linesize[0]));
-    memcpy(picref->data,     pic->data,     sizeof(picref->data));
-    memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
-
-    pic->   extended_data = pic->data;
-    picref->extended_data = picref->data;
-
-    return picref;
-
-fail:
-    if (picref && picref->video)
-        av_free(picref->video);
-    av_free(picref);
-    av_free(pic);
-    return NULL;
-}
-
 int avfilter_request_frame(AVFilterLink *link)
 {
     FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
@@ -538,107 +310,6 @@ void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
         ff_avfilter_graph_update_heap(link->graph, link);
 }
 
-/* XXX: should we do the duplicating of the picture ref here, instead of
- * forcing the source filter to do it? */
-void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
-{
-    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
-    AVFilterPad *dst = link->dstpad;
-    int perms = picref->perms;
-    AVFilterCommand *cmd= link->dst->command_queue;
-
-    FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
-
-    if (!(start_frame = dst->start_frame))
-        start_frame = avfilter_default_start_frame;
-
-    if (picref->linesize[0] < 0)
-        perms |= AV_PERM_NEG_LINESIZES;
-    /* prepare to copy the picture if it has insufficient permissions */
-    if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
-        av_log(link->dst, AV_LOG_DEBUG,
-                "frame copy needed (have perms %x, need %x, reject %x)\n",
-                picref->perms,
-                link->dstpad->min_perms, link->dstpad->rej_perms);
-
-        link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
-        link->src_buf = picref;
-        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
-    }
-    else
-        link->cur_buf = picref;
-
-    while(cmd && cmd->time <= picref->pts * av_q2d(link->time_base)){
-        av_log(link->dst, AV_LOG_DEBUG,
-               "Processing command time:%f command:%s arg:%s\n",
-               cmd->time, cmd->command, cmd->arg);
-        avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
-        command_queue_pop(link->dst);
-        cmd= link->dst->command_queue;
-    }
-
-    start_frame(link, link->cur_buf);
-    ff_update_link_current_pts(link, link->cur_buf->pts);
-}
-
-void avfilter_end_frame(AVFilterLink *link)
-{
-    void (*end_frame)(AVFilterLink *);
-
-    if (!(end_frame = link->dstpad->end_frame))
-        end_frame = avfilter_default_end_frame;
-
-    end_frame(link);
-
-    /* unreference the source picture if we're feeding the destination filter
-     * a copied version dues to permission issues */
-    if (link->src_buf) {
-        avfilter_unref_buffer(link->src_buf);
-        link->src_buf = NULL;
-    }
-}
-
-void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
-{
-    uint8_t *src[4], *dst[4];
-    int i, j, vsub;
-    void (*draw_slice)(AVFilterLink *, int, int, int);
-
-    FF_DPRINTF_START(NULL, draw_slice); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
-
-    /* copy the slice if needed for permission reasons */
-    if (link->src_buf) {
-        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
-
-        for (i = 0; i < 4; i++) {
-            if (link->src_buf->data[i]) {
-                src[i] = link->src_buf-> data[i] +
-                    (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
-                dst[i] = link->cur_buf->data[i] +
-                    (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
-            } else
-                src[i] = dst[i] = NULL;
-        }
-
-        for (i = 0; i < 4; i++) {
-            int planew =
-                av_image_get_linesize(link->format, link->cur_buf->video->w, i);
-
-            if (!src[i]) continue;
-
-            for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
-                memcpy(dst[i], src[i], planew);
-                src[i] += link->src_buf->linesize[i];
-                dst[i] += link->cur_buf->linesize[i];
-            }
-        }
-    }
-
-    if (!(draw_slice = link->dstpad->draw_slice))
-        draw_slice = avfilter_default_draw_slice;
-    draw_slice(link, y, h, slice_dir);
-}
-
 int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
 {
     if(!strcmp(cmd, "ping")){
@@ -788,6 +459,10 @@ void avfilter_free(AVFilterContext *filter)
                 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
             avfilter_formats_unref(&link->in_formats);
             avfilter_formats_unref(&link->out_formats);
+            avfilter_formats_unref(&link->in_samplerates);
+            avfilter_formats_unref(&link->out_samplerates);
+            ff_channel_layouts_unref(&link->in_channel_layouts);
+            ff_channel_layouts_unref(&link->out_channel_layouts);
         }
         avfilter_link_free(&link);
     }
@@ -797,6 +472,10 @@ void avfilter_free(AVFilterContext *filter)
                 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
             avfilter_formats_unref(&link->in_formats);
             avfilter_formats_unref(&link->out_formats);
+            avfilter_formats_unref(&link->in_samplerates);
+            avfilter_formats_unref(&link->out_samplerates);
+            ff_channel_layouts_unref(&link->in_channel_layouts);
+            ff_channel_layouts_unref(&link->out_channel_layouts);
         }
         avfilter_link_free(&link);
     }
@@ -808,7 +487,7 @@ void avfilter_free(AVFilterContext *filter)
     av_freep(&filter->outputs);
     av_freep(&filter->priv);
     while(filter->command_queue){
-        command_queue_pop(filter);
+        ff_command_queue_pop(filter);
     }
     av_free(filter);
 }
@@ -821,16 +500,3 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         ret = filter->filter->init(filter, args, opaque);
     return ret;
 }
-
-void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
-{
-    // copy common properties
-    dst->pts             = src->pts;
-    dst->pos             = src->pos;
-
-    switch (src->type) {
-    case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
-    case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
-    default: break;
-    }
-}
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 06146cfc2d..c76c637e8d 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -258,8 +258,8 @@ void avfilter_unref_bufferp(AVFilterBufferRef **ref);
  * pointer to each of the pointers to itself.
  */
 typedef struct AVFilterFormats {
-    unsigned format_count;      ///< number of formats
     int64_t *formats;           ///< list of media formats
+    unsigned format_count;      ///< number of formats
 
     unsigned refcount;          ///< number of references to this list
     struct AVFilterFormats ***refs; ///< references to this list
@@ -274,7 +274,6 @@ typedef struct AVFilterFormats {
  * @return the format list, with no existing references
  */
 AVFilterFormats *avfilter_make_format_list(const int *fmts);
-AVFilterFormats *avfilter_make_format64_list(const int64_t *fmts);
 
 /**
  * Add fmt to the list of media formats contained in *avff.
@@ -305,11 +304,6 @@ AVFilterFormats *avfilter_make_all_formats(enum AVMediaType type);
 extern const int64_t avfilter_all_channel_layouts[];
 
 /**
- * Return a list of all channel layouts supported by FFmpeg.
- */
-AVFilterFormats *avfilter_make_all_channel_layouts(void);
-
-/**
  * Return a list of all audio packing formats.
  */
 AVFilterFormats *avfilter_make_all_packing_formats(void);
@@ -521,6 +515,7 @@ AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link,
  * formats/layouts. If there are no links hooked to this filter, the list
  * of formats is freed.
  */
+void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
 void avfilter_set_common_pixel_formats(AVFilterContext *ctx, AVFilterFormats *formats);
 void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *formats);
 void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats);
@@ -674,8 +669,6 @@ struct AVFilterLink {
     AVFilterFormats *in_formats;
     AVFilterFormats *out_formats;
 
-    AVFilterFormats *in_chlayouts;
-    AVFilterFormats *out_chlayouts;
     AVFilterFormats *in_packing;
     AVFilterFormats *out_packing;
 
@@ -713,17 +706,26 @@ struct AVFilterLink {
      */
     int64_t current_pts;
 
-    /**
-     * Private fields
-     *
-     * The following fields are for internal use only.
-     * Their type, offset, number and semantic can change without notice.
+    /*****************************************************************
+     * All fields below this line are not part of the public API. They
+     * may not be used outside of libavfilter and can be changed and
+     * removed at will.
+     * New public fields should be added right above.
+     *****************************************************************
      */
-
     /**
      * Index in the age array.
      */
     int age_index;
+
+    /**
+     * Lists of channel layouts and sample rates used for automatic
+     * negotiation.
+     */
+    AVFilterFormats  *in_samplerates;
+    AVFilterFormats *out_samplerates;
+    struct AVFilterChannelLayouts  *in_channel_layouts;
+    struct AVFilterChannelLayouts *out_channel_layouts;
 };
 
 /**
diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 3bc10f9586..90d7560d6e 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -28,8 +28,10 @@
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 #include "avfiltergraph.h"
+#include "formats.h"
 #include "internal.h"
 
+#include "libavutil/audioconvert.h"
 #include "libavutil/log.h"
 
 static const AVClass filtergraph_class = {
@@ -198,10 +200,10 @@ static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 
     if (link->type == AVMEDIA_TYPE_AUDIO &&
          (((link = filt_ctx-> inputs[0]) &&
-           (!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
+           (!ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts) ||
             !avfilter_merge_formats(link->in_packing,   link->out_packing))) ||
          ((link = filt_ctx->outputs[0]) &&
-           (!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
+           (!ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts) ||
             !avfilter_merge_formats(link->in_packing,   link->out_packing))))
        ) {
         av_log(NULL, AV_LOG_ERROR,
@@ -217,7 +219,10 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 {
     int i, j, ret;
     char filt_args[128];
-    AVFilterFormats *formats, *chlayouts, *packing;
+    AVFilterFormats *formats, *packing;
+    AVFilterChannelLayouts *chlayouts;
+    AVFilterFormats *samplerates;
+    int scaler_count = 0, resampler_count = 0;
 
     /* ask all the sub-filters for their supported media formats */
     for (i = 0; i < graph->filter_count; i++) {
@@ -233,6 +238,7 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 
         for (j = 0; j < filter->input_count; j++) {
             AVFilterLink *link = filter->inputs[j];
+#if 0
             if (!link) continue;
 
             if (!link->in_formats || !link->out_formats)
@@ -248,7 +254,7 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
                     return ret;
             }
             else if (link->type == AVMEDIA_TYPE_AUDIO) {
-                if (!link->in_chlayouts || !link->out_chlayouts ||
+                if (!link->in_channel_layouts || !link->out_channel_layouts ||
                     !link->in_packing   || !link->out_packing)
                     return AVERROR(EINVAL);
 
@@ -256,11 +262,100 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
                  * three categories, aconvert will use a common format
                  * whenever possible. */
                 formats   = avfilter_merge_formats(link->in_formats,   link->out_formats);
-                chlayouts = avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts);
+                chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
+                samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
                 packing   = avfilter_merge_formats(link->in_packing,   link->out_packing);
-                if (!formats || !chlayouts || !packing)
+
+                if (!formats || !chlayouts || !packing || !samplerates)
                     if (ret = insert_conv_filter(graph, link, "aconvert", NULL))
                        return ret;
+#else
+            int convert_needed = 0;
+
+            if (!link)
+                continue;
+
+            if (link->in_formats != link->out_formats &&
+                !avfilter_merge_formats(link->in_formats,
+                                        link->out_formats))
+                convert_needed = 1;
+            if (link->type == AVMEDIA_TYPE_AUDIO) {
+                if (link->in_channel_layouts != link->out_channel_layouts &&
+                    !ff_merge_channel_layouts(link->in_channel_layouts,
+                                              link->out_channel_layouts))
+                    convert_needed = 1;
+                if (link->in_samplerates != link->out_samplerates &&
+                    !ff_merge_samplerates(link->in_samplerates,
+                                          link->out_samplerates))
+                    convert_needed = 1;
+            }
+
+            if (convert_needed) {
+                AVFilterContext *convert;
+                AVFilter *filter;
+                AVFilterLink *inlink, *outlink;
+                char scale_args[256];
+                char inst_name[30];
+
+                /* couldn't merge format lists. auto-insert conversion filter */
+                switch (link->type) {
+                case AVMEDIA_TYPE_VIDEO:
+                    snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
+                             scaler_count++);
+                    snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
+                    if ((ret = avfilter_graph_create_filter(&convert,
+                                                            avfilter_get_by_name("scale"),
+                                                            inst_name, scale_args, NULL,
+                                                            graph)) < 0)
+                        return ret;
+                    break;
+                case AVMEDIA_TYPE_AUDIO:
+                    if (!(filter = avfilter_get_by_name("resample"))) {
+                        av_log(log_ctx, AV_LOG_ERROR, "'resample' filter "
+                               "not present, cannot convert audio formats.\n");
+                        return AVERROR(EINVAL);
+                    }
+
+                    snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
+                             resampler_count++);
+                    if ((ret = avfilter_graph_create_filter(&convert,
+                                                            avfilter_get_by_name("resample"),
+                                                            inst_name, NULL, NULL, graph)) < 0)
+                        return ret;
+                    break;
+                default:
+                    return AVERROR(EINVAL);
+                }
+
+                if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
+                    return ret;
+
+                convert->filter->query_formats(convert);
+                inlink  = convert->inputs[0];
+                outlink = convert->outputs[0];
+                if (!avfilter_merge_formats( inlink->in_formats,  inlink->out_formats) ||
+                    !avfilter_merge_formats(outlink->in_formats, outlink->out_formats))
+                    ret |= AVERROR(ENOSYS);
+                if (inlink->type == AVMEDIA_TYPE_AUDIO &&
+                    (!ff_merge_samplerates(inlink->in_samplerates,
+                                           inlink->out_samplerates) ||
+                     !ff_merge_channel_layouts(inlink->in_channel_layouts,
+                                               inlink->out_channel_layouts)))
+                    ret |= AVERROR(ENOSYS);
+                if (outlink->type == AVMEDIA_TYPE_AUDIO &&
+                    (!ff_merge_samplerates(outlink->in_samplerates,
+                                           outlink->out_samplerates) ||
+                     !ff_merge_channel_layouts(outlink->in_channel_layouts,
+                                               outlink->out_channel_layouts)))
+                    ret |= AVERROR(ENOSYS);
+
+                if (ret < 0) {
+                    av_log(log_ctx, AV_LOG_ERROR,
+                           "Impossible to convert between the formats supported by the filter "
+                           "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
+                    return ret;
+                }
+#endif
             }
         }
     }
@@ -268,10 +363,10 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
     return 0;
 }
 
-static void pick_format(AVFilterLink *link, AVFilterLink *ref)
+static int pick_format(AVFilterLink *link, AVFilterLink *ref)
 {
     if (!link || !link->in_formats)
-        return;
+        return 0;
 
     if (link->type == AVMEDIA_TYPE_VIDEO) {
         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
@@ -288,50 +383,83 @@ static void pick_format(AVFilterLink *link, AVFilterLink *ref)
 
     link->in_formats->format_count = 1;
     link->format = link->in_formats->formats[0];
-    avfilter_formats_unref(&link->in_formats);
-    avfilter_formats_unref(&link->out_formats);
 
     if (link->type == AVMEDIA_TYPE_AUDIO) {
-        link->in_chlayouts->format_count = 1;
-        link->channel_layout = link->in_chlayouts->formats[0];
-        avfilter_formats_unref(&link->in_chlayouts);
-        avfilter_formats_unref(&link->out_chlayouts);
-
-        link->in_packing->format_count = 1;
-        link->planar = link->in_packing->formats[0] == AVFILTER_PLANAR;
-        avfilter_formats_unref(&link->in_packing);
-        avfilter_formats_unref(&link->out_packing);
+        if (!link->in_samplerates->format_count) {
+            av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
+                   " the link between filters %s and %s.\n", link->src->name,
+                   link->dst->name);
+            return AVERROR(EINVAL);
+        }
+        link->in_samplerates->format_count = 1;
+        link->sample_rate = link->in_samplerates->formats[0];
+
+        if (!link->in_channel_layouts->nb_channel_layouts) {
+            av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
+                   "the link between filters %s and %s.\n", link->src->name,
+                   link->dst->name);
+            return AVERROR(EINVAL);
+        }
+        link->in_channel_layouts->nb_channel_layouts = 1;
+        link->channel_layout = link->in_channel_layouts->channel_layouts[0];
     }
+
+    avfilter_formats_unref(&link->in_formats);
+    avfilter_formats_unref(&link->out_formats);
+    avfilter_formats_unref(&link->in_samplerates);
+    avfilter_formats_unref(&link->out_samplerates);
+    ff_channel_layouts_unref(&link->in_channel_layouts);
+    ff_channel_layouts_unref(&link->out_channel_layouts);
+
+    return 0;
 }
 
+#define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
+do {                                                                   \
+    for (i = 0; i < filter->input_count; i++) {                        \
+        AVFilterLink *link = filter->inputs[i];                        \
+        fmt_type fmt;                                                  \
+                                                                       \
+        if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
+            continue;                                                  \
+        fmt = link->out_ ## list->var[0];                              \
+                                                                       \
+        for (j = 0; j < filter->output_count; j++) {                   \
+            AVFilterLink *out_link = filter->outputs[j];               \
+            list_type *fmts;                                           \
+                                                                       \
+            if (link->type != out_link->type ||                        \
+                out_link->in_ ## list->nb == 1)                        \
+                continue;                                              \
+            fmts = out_link->in_ ## list;                              \
+                                                                       \
+            if (!out_link->in_ ## list->nb) {                          \
+                add_format(&out_link->in_ ##list, fmt);                \
+                break;                                                 \
+            }                                                          \
+                                                                       \
+            for (k = 0; k < out_link->in_ ## list->nb; k++)            \
+                if (fmts->var[k] == fmt) {                             \
+                    fmts->var[0]  = fmt;                               \
+                    fmts->nb = 1;                                      \
+                    ret = 1;                                           \
+                    break;                                             \
+                }                                                      \
+        }                                                              \
+    }                                                                  \
+} while (0)
+
 static int reduce_formats_on_filter(AVFilterContext *filter)
 {
     int i, j, k, ret = 0;
 
-    for (i = 0; i < filter->input_count; i++) {
-        AVFilterLink *link = filter->inputs[i];
-        int         format = link->out_formats->formats[0];
-
-        if (link->out_formats->format_count != 1)
-            continue;
-
-        for (j = 0; j < filter->output_count; j++) {
-            AVFilterLink *out_link = filter->outputs[j];
-            AVFilterFormats  *fmts = out_link->in_formats;
-
-            if (link->type != out_link->type ||
-                out_link->in_formats->format_count == 1)
-                continue;
+    REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
+                   format_count, avfilter_add_format);
+    REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
+                   format_count, avfilter_add_format);
+    REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
+                   channel_layouts, nb_channel_layouts, ff_add_channel_layout);
 
-            for (k = 0; k < out_link->in_formats->format_count; k++)
-                if (fmts->formats[k] == format) {
-                    fmts->formats[0]   = format;
-                    fmts->format_count = 1;
-                    ret = 1;
-                    break;
-                }
-        }
-    }
     return ret;
 }
 
@@ -347,9 +475,109 @@ static void reduce_formats(AVFilterGraph *graph)
     } while (reduced);
 }
 
-static void pick_formats(AVFilterGraph *graph)
+static void swap_samplerates_on_filter(AVFilterContext *filter)
+{
+    AVFilterLink *link = NULL;
+    int sample_rate;
+    int i, j;
+
+    for (i = 0; i < filter->input_count; i++) {
+        link = filter->inputs[i];
+
+        if (link->type == AVMEDIA_TYPE_AUDIO &&
+            link->out_samplerates->format_count == 1)
+            break;
+    }
+    if (i == filter->input_count)
+        return;
+
+    sample_rate = link->out_samplerates->formats[0];
+
+    for (i = 0; i < filter->output_count; i++) {
+        AVFilterLink *outlink = filter->outputs[i];
+        int best_idx, best_diff = INT_MAX;
+
+        if (outlink->type != AVMEDIA_TYPE_AUDIO ||
+            outlink->in_samplerates->format_count < 2)
+            continue;
+
+        for (j = 0; j < outlink->in_samplerates->format_count; j++) {
+            int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
+
+            if (diff < best_diff) {
+                best_diff = diff;
+                best_idx  = j;
+            }
+        }
+        FFSWAP(int, outlink->in_samplerates->formats[0],
+               outlink->in_samplerates->formats[best_idx]);
+    }
+}
+
+static void swap_samplerates(AVFilterGraph *graph)
 {
+    int i;
+
+    for (i = 0; i < graph->filter_count; i++)
+        swap_samplerates_on_filter(graph->filters[i]);
+}
+
+static void swap_channel_layouts_on_filter(AVFilterContext *filter)
+{
+    AVFilterLink *link = NULL;
+    uint64_t chlayout;
     int i, j;
+
+    for (i = 0; i < filter->input_count; i++) {
+        link = filter->inputs[i];
+
+        if (link->type == AVMEDIA_TYPE_AUDIO &&
+            link->out_channel_layouts->nb_channel_layouts == 1)
+            break;
+    }
+    if (i == filter->input_count)
+        return;
+
+    chlayout = link->out_channel_layouts->channel_layouts[0];
+
+    for (i = 0; i < filter->output_count; i++) {
+        AVFilterLink *outlink = filter->outputs[i];
+        int best_idx, best_score = INT_MIN;
+
+        if (outlink->type != AVMEDIA_TYPE_AUDIO ||
+            outlink->in_channel_layouts->nb_channel_layouts < 2)
+            continue;
+
+        for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
+            uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
+            int matched_channels  = av_get_channel_layout_nb_channels(chlayout &
+                                                                      out_chlayout);
+            int extra_channels     = av_get_channel_layout_nb_channels(out_chlayout &
+                                                                       (~chlayout));
+            int score = matched_channels - extra_channels;
+
+            if (score > best_score) {
+                best_score = score;
+                best_idx   = j;
+            }
+        }
+        FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
+               outlink->in_channel_layouts->channel_layouts[best_idx]);
+    }
+
+}
+
+static void swap_channel_layouts(AVFilterGraph *graph)
+{
+    int i;
+
+    for (i = 0; i < graph->filter_count; i++)
+        swap_channel_layouts_on_filter(graph->filters[i]);
+}
+
+static int pick_formats(AVFilterGraph *graph)
+{
+    int i, j, ret;
     int change;
 
     do{
@@ -385,13 +613,15 @@ static void pick_formats(AVFilterGraph *graph)
 
     for (i = 0; i < graph->filter_count; i++) {
         AVFilterContext *filter = graph->filters[i];
-        if (1) {
-            for (j = 0; j < filter->input_count; j++)
-                pick_format(filter->inputs[j], NULL);
-            for (j = 0; j < filter->output_count; j++)
-                pick_format(filter->outputs[j], NULL);
-        }
+
+        for (j = 0; j < filter->input_count; j++)
+            if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
+                return ret;
+        for (j = 0; j < filter->output_count; j++)
+            if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
+                return ret;
     }
+    return 0;
 }
 
 int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
@@ -407,7 +637,13 @@ int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
      * of format conversion inside filters */
     reduce_formats(graph);
 
-    pick_formats(graph);
+    /* for audio filters, ensure the best sample rate and channel layout
+     * is selected */
+    swap_samplerates(graph);
+    swap_channel_layouts(graph);
+
+    if ((ret = pick_formats(graph)) < 0)
+        return ret;
 
     return 0;
 }
diff --git a/libavfilter/buffer.c b/libavfilter/buffer.c
new file mode 100644
index 0000000000..32431c6d95
--- /dev/null
+++ b/libavfilter/buffer.c
@@ -0,0 +1,244 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/audioconvert.h"
+#include "libavutil/avassert.h"
+#include "libavcodec/avcodec.h"
+
+#include "avfilter.h"
+#include "internal.h"
+#include "avcodec.h"
+
+void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
+{
+    if (ptr->extended_data != ptr->data)
+        av_freep(&ptr->extended_data);
+    av_free(ptr->data[0]);
+    av_free(ptr);
+}
+
+AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
+{
+    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
+    if (!ret)
+        return NULL;
+    *ret = *ref;
+    if (ref->type == AVMEDIA_TYPE_VIDEO) {
+        ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
+        if (!ret->video) {
+            av_free(ret);
+            return NULL;
+        }
+        *ret->video = *ref->video;
+        ret->extended_data = ret->data;
+    } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
+        ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
+        if (!ret->audio) {
+            av_free(ret);
+            return NULL;
+        }
+        *ret->audio = *ref->audio;
+
+        if (ref->extended_data && ref->extended_data != ref->data) {
+            int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
+            if (!(ret->extended_data = av_malloc(sizeof(*ret->extended_data) *
+                                                 nb_channels))) {
+                av_freep(&ret->audio);
+                av_freep(&ret);
+                return NULL;
+            }
+            memcpy(ret->extended_data, ref->extended_data,
+                   sizeof(*ret->extended_data) * nb_channels);
+        } else
+            ret->extended_data = ret->data;
+    }
+    ret->perms &= pmask;
+    ret->buf->refcount ++;
+    return ret;
+}
+
+void ff_free_pool(AVFilterPool *pool)
+{
+    int i;
+
+    av_assert0(pool->refcount > 0);
+
+    for (i = 0; i < POOL_SIZE; i++) {
+        if (pool->pic[i]) {
+            AVFilterBufferRef *picref = pool->pic[i];
+            /* free buffer: picrefs stored in the pool are not
+             * supposed to contain a free callback */
+            av_assert0(!picref->buf->refcount);
+            av_freep(&picref->buf->data[0]);
+            av_freep(&picref->buf);
+
+            av_freep(&picref->audio);
+            av_freep(&picref->video);
+            av_freep(&pool->pic[i]);
+            pool->count--;
+        }
+    }
+    pool->draining = 1;
+
+    if (!--pool->refcount) {
+        av_assert0(!pool->count);
+        av_free(pool);
+    }
+}
+
+static void store_in_pool(AVFilterBufferRef *ref)
+{
+    int i;
+    AVFilterPool *pool= ref->buf->priv;
+
+    av_assert0(ref->buf->data[0]);
+    av_assert0(pool->refcount>0);
+
+    if (pool->count == POOL_SIZE) {
+        AVFilterBufferRef *ref1 = pool->pic[0];
+        av_freep(&ref1->video);
+        av_freep(&ref1->audio);
+        av_freep(&ref1->buf->data[0]);
+        av_freep(&ref1->buf);
+        av_free(ref1);
+        memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
+        pool->count--;
+        pool->pic[POOL_SIZE-1] = NULL;
+    }
+
+    for (i = 0; i < POOL_SIZE; i++) {
+        if (!pool->pic[i]) {
+            pool->pic[i] = ref;
+            pool->count++;
+            break;
+        }
+    }
+    if (pool->draining) {
+        ff_free_pool(pool);
+    } else
+        --pool->refcount;
+}
+
+void avfilter_unref_buffer(AVFilterBufferRef *ref)
+{
+    if (!ref)
+        return;
+    av_assert0(ref->buf->refcount > 0);
+    if (!(--ref->buf->refcount)) {
+        if (!ref->buf->free) {
+            store_in_pool(ref);
+            return;
+        }
+        ref->buf->free(ref->buf);
+    }
+    if (ref->extended_data != ref->data)
+        av_freep(&ref->extended_data);
+    av_freep(&ref->video);
+    av_freep(&ref->audio);
+    av_free(ref);
+}
+
+void avfilter_unref_bufferp(AVFilterBufferRef **ref)
+{
+    avfilter_unref_buffer(*ref);
+    *ref = NULL;
+}
+
+int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
+{
+    dst->pts    = src->pts;
+    dst->pos    = src->pkt_pos;
+    dst->format = src->format;
+
+    switch (dst->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        dst->video->w                   = src->width;
+        dst->video->h                   = src->height;
+        dst->video->sample_aspect_ratio = src->sample_aspect_ratio;
+        dst->video->interlaced          = src->interlaced_frame;
+        dst->video->top_field_first     = src->top_field_first;
+        dst->video->key_frame           = src->key_frame;
+        dst->video->pict_type           = src->pict_type;
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        dst->audio->sample_rate         = src->sample_rate;
+        dst->audio->channel_layout      = src->channel_layout;
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+int avfilter_copy_buf_props(AVFrame *dst, const AVFilterBufferRef *src)
+{
+    int planes, nb_channels;
+
+    memcpy(dst->data, src->data, sizeof(dst->data));
+    memcpy(dst->linesize, src->linesize, sizeof(dst->linesize));
+
+    dst->pts     = src->pts;
+    dst->format  = src->format;
+
+    switch (src->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        dst->width               = src->video->w;
+        dst->height              = src->video->h;
+        dst->sample_aspect_ratio = src->video->sample_aspect_ratio;
+        dst->interlaced_frame    = src->video->interlaced;
+        dst->top_field_first     = src->video->top_field_first;
+        dst->key_frame           = src->video->key_frame;
+        dst->pict_type           = src->video->pict_type;
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        nb_channels = av_get_channel_layout_nb_channels(src->audio->channel_layout);
+        planes      = av_sample_fmt_is_planar(src->format) ? nb_channels : 1;
+
+        if (planes > FF_ARRAY_ELEMS(dst->data)) {
+            dst->extended_data = av_mallocz(planes * sizeof(*dst->extended_data));
+            if (!dst->extended_data)
+                return AVERROR(ENOMEM);
+            memcpy(dst->extended_data, src->extended_data,
+                   planes * sizeof(dst->extended_data));
+        } else
+            dst->extended_data = dst->data;
+
+        dst->sample_rate         = src->audio->sample_rate;
+        dst->channel_layout      = src->audio->channel_layout;
+        dst->nb_samples          = src->audio->nb_samples;
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
+{
+    // copy common properties
+    dst->pts             = src->pts;
+    dst->pos             = src->pos;
+
+    switch (src->type) {
+    case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
+    case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
+    default: break;
+    }
+}
diff --git a/libavfilter/buffersink.c b/libavfilter/buffersink.c
index f0fcab553e..90ebd93908 100644
--- a/libavfilter/buffersink.c
+++ b/libavfilter/buffersink.c
@@ -23,13 +23,20 @@
  * buffer sink
  */
 
+#include "libavutil/audio_fifo.h"
+#include "libavutil/audioconvert.h"
 #include "libavutil/fifo.h"
+#include "libavutil/mathematics.h"
 
+#include "audio.h"
 #include "avfilter.h"
 #include "buffersink.h"
 
 typedef struct {
-    AVFifoBuffer *fifo;          ///< FIFO buffer of video frame references
+    AVFifoBuffer *fifo;          ///< FIFO buffer of frame references
+
+    AVAudioFifo  *audio_fifo;    ///< FIFO for audio samples
+    int64_t next_pts;            ///< interpolating audio pts
 } BufferSinkContext;
 
 #define FIFO_INIT_SIZE 8
@@ -44,6 +51,9 @@ static av_cold void uninit(AVFilterContext *ctx)
         avfilter_unref_buffer(buf);
     }
     av_fifo_free(sink->fifo);
+
+    if (sink->audio_fifo)
+        av_audio_fifo_free(sink->audio_fifo);
 }
 
 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
@@ -58,9 +68,8 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
     return 0;
 }
 
-static void end_frame(AVFilterLink *link)
+static void write_buf(AVFilterContext *ctx, AVFilterBufferRef *buf)
 {
-    AVFilterContext   *ctx = link->dst;
     BufferSinkContext *sink = ctx->priv;
 
     if (av_fifo_space(sink->fifo) < sizeof(AVFilterBufferRef *) &&
@@ -69,10 +78,20 @@ static void end_frame(AVFilterLink *link)
             return;
     }
 
-    av_fifo_generic_write(sink->fifo, &link->cur_buf, sizeof(link->cur_buf), NULL);
+    av_fifo_generic_write(sink->fifo, &buf, sizeof(buf), NULL);
+}
+
+static void end_frame(AVFilterLink *link)
+{
+    write_buf(link->dst, link->cur_buf);
     link->cur_buf = NULL;
 }
 
+static void filter_samples(AVFilterLink *link, AVFilterBufferRef *buf)
+{
+    write_buf(link->dst, buf);
+}
+
 int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
 {
     BufferSinkContext *sink = ctx->priv;
@@ -98,6 +117,66 @@ int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
     return 0;
 }
 
+static int read_from_fifo(AVFilterContext *ctx, AVFilterBufferRef **pbuf,
+                          int nb_samples)
+{
+    BufferSinkContext *s = ctx->priv;
+    AVFilterLink   *link = ctx->inputs[0];
+    AVFilterBufferRef *buf;
+
+    if (!(buf = ff_get_audio_buffer(link, AV_PERM_WRITE, nb_samples)))
+        return AVERROR(ENOMEM);
+    av_audio_fifo_read(s->audio_fifo, (void**)buf->extended_data, nb_samples);
+
+    buf->pts = s->next_pts;
+    s->next_pts += av_rescale_q(nb_samples, (AVRational){1, link->sample_rate},
+                                link->time_base);
+
+    *pbuf = buf;
+    return 0;
+
+}
+
+int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **pbuf,
+                               int nb_samples)
+{
+    BufferSinkContext *s = ctx->priv;
+    AVFilterLink   *link = ctx->inputs[0];
+    int ret = 0;
+
+    if (!s->audio_fifo) {
+        int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
+        if (!(s->audio_fifo = av_audio_fifo_alloc(link->format, nb_channels, nb_samples)))
+            return AVERROR(ENOMEM);
+    }
+
+    while (ret >= 0) {
+        AVFilterBufferRef *buf;
+
+        if (av_audio_fifo_size(s->audio_fifo) >= nb_samples)
+            return read_from_fifo(ctx, pbuf, nb_samples);
+
+        ret = av_buffersink_read(ctx, &buf);
+        if (ret == AVERROR_EOF && av_audio_fifo_size(s->audio_fifo))
+            return read_from_fifo(ctx, pbuf, av_audio_fifo_size(s->audio_fifo));
+        else if (ret < 0)
+            return ret;
+
+        if (buf->pts != AV_NOPTS_VALUE) {
+            s->next_pts = buf->pts -
+                          av_rescale_q(av_audio_fifo_size(s->audio_fifo),
+                                       (AVRational){ 1, link->sample_rate },
+                                       link->time_base);
+        }
+
+        ret = av_audio_fifo_write(s->audio_fifo, (void**)buf->extended_data,
+                                  buf->audio->nb_samples);
+        avfilter_unref_buffer(buf);
+    }
+
+    return ret;
+}
+
 AVFilter avfilter_vsink_buffer = {
     .name      = "buffersink_old",
     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
@@ -112,3 +191,18 @@ AVFilter avfilter_vsink_buffer = {
                                   { .name = NULL }},
     .outputs   = (AVFilterPad[]) {{ .name = NULL }},
 };
+
+AVFilter avfilter_asink_abuffer = {
+    .name      = "abuffersink_old",
+    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
+    .priv_size = sizeof(BufferSinkContext),
+    .init      = init,
+    .uninit    = uninit,
+
+    .inputs    = (AVFilterPad[]) {{ .name           = "default",
+                                    .type           = AVMEDIA_TYPE_AUDIO,
+                                    .filter_samples = filter_samples,
+                                    .min_perms      = AV_PERM_READ, },
+                                  { .name = NULL }},
+    .outputs   = (AVFilterPad[]) {{ .name = NULL }},
+};
diff --git a/libavfilter/buffersink.h b/libavfilter/buffersink.h
index 86a4b2462b..2ee5294b26 100644
--- a/libavfilter/buffersink.h
+++ b/libavfilter/buffersink.h
@@ -101,7 +101,7 @@ int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *buffer_sink,
 /**
  * Get a buffer with filtered data from sink and put it in buf.
  *
- * @param sink pointer to a context of a buffersink AVFilter.
+ * @param sink pointer to a context of a buffersink or abuffersink AVFilter.
  * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
  *            must be freed by the caller using avfilter_unref_buffer().
  *            Buf may also be NULL to query whether a buffer is ready to be
@@ -112,4 +112,23 @@ int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *buffer_sink,
  */
 int av_buffersink_read(AVFilterContext *sink, AVFilterBufferRef **buf);
 
+/**
+ * Same as av_buffersink_read, but with the ability to specify the number of
+ * samples read. This function is less efficient than av_buffersink_read(),
+ * because it copies the data around.
+ *
+ * @param sink pointer to a context of the abuffersink AVFilter.
+ * @param buf pointer to the buffer will be written here if buf is non-NULL. buf
+ *            must be freed by the caller using avfilter_unref_buffer(). buf
+ *            will contain exactly nb_samples audio samples, except at the end
+ *            of stream, when it can contain less than nb_samples.
+ *            Buf may also be NULL to query whether a buffer is ready to be
+ *            output.
+ *
+ * @warning do not mix this function with av_buffersink_read(). Use only one or
+ * the other with a single sink, not both.
+ */
+int av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
+                               int nb_samples);
+
 #endif /* AVFILTER_BUFFERSINK_H */
diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
new file mode 100644
index 0000000000..305d1c49d6
--- /dev/null
+++ b/libavfilter/buffersrc.c
@@ -0,0 +1,403 @@
+/*
+ * Copyright (c) 2008 Vitor Sessak
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * memory buffer source filter
+ */
+
+#include "audio.h"
+#include "avfilter.h"
+#include "buffersrc.h"
+#include "formats.h"
+#include "vsrc_buffer.h"
+#include "avcodec.h"
+
+#include "libavutil/audioconvert.h"
+#include "libavutil/fifo.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/samplefmt.h"
+
+typedef struct {
+    const AVClass    *class;
+    AVFifoBuffer     *fifo;
+    AVRational        time_base;     ///< time_base to set in the output link
+
+    /* video only */
+    int               h, w;
+    enum PixelFormat  pix_fmt;
+    AVRational        pixel_aspect;
+
+    /* audio only */
+    int sample_rate;
+    enum AVSampleFormat sample_fmt;
+    char               *sample_fmt_str;
+    uint64_t channel_layout;
+    char    *channel_layout_str;
+
+    int eof;
+} BufferSourceContext;
+
+#define CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)\
+    if (c->w != width || c->h != height || c->pix_fmt != format) {\
+        av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
+        return AVERROR(EINVAL);\
+    }
+
+#define CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, format)\
+    if (c->sample_fmt != format || c->sample_rate != srate ||\
+        c->channel_layout != ch_layout) {\
+        av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
+        return AVERROR(EINVAL);\
+    }
+
+#if FF_API_VSRC_BUFFER_ADD_FRAME
+static int av_vsrc_buffer_add_frame_alt(AVFilterContext *buffer_filter, AVFrame *frame,
+                             int64_t pts, AVRational pixel_aspect)
+{
+    int64_t orig_pts = frame->pts;
+    AVRational orig_sar = frame->sample_aspect_ratio;
+    int ret;
+
+    frame->pts = pts;
+    frame->sample_aspect_ratio = pixel_aspect;
+    if ((ret = av_buffersrc_write_frame(buffer_filter, frame)) < 0)
+        return ret;
+    frame->pts = orig_pts;
+    frame->sample_aspect_ratio = orig_sar;
+
+    return 0;
+}
+#endif
+
+int av_buffersrc_write_frame(AVFilterContext *buffer_filter, AVFrame *frame)
+{
+    BufferSourceContext *c = buffer_filter->priv;
+    AVFilterBufferRef *buf;
+    int ret;
+
+    if (!frame) {
+        c->eof = 1;
+        return 0;
+    } else if (c->eof)
+        return AVERROR(EINVAL);
+
+    if (!av_fifo_space(c->fifo) &&
+        (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
+                                         sizeof(buf))) < 0)
+        return ret;
+
+    switch (buffer_filter->outputs[0]->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        CHECK_VIDEO_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height,
+                                 frame->format);
+        buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
+                                        c->w, c->h);
+        av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
+                      c->pix_fmt, c->w, c->h);
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        CHECK_AUDIO_PARAM_CHANGE(buffer_filter, c, frame->sample_rate, frame->channel_layout,
+                                 frame->format);
+        buf = ff_get_audio_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
+                                  frame->nb_samples);
+        av_samples_copy(buf->extended_data, frame->extended_data,
+                        0, 0, frame->nb_samples,
+                        av_get_channel_layout_nb_channels(frame->channel_layout),
+                        frame->format);
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    avfilter_copy_frame_props(buf, frame);
+
+    if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
+        avfilter_unref_buffer(buf);
+        return ret;
+    }
+
+    return 0;
+}
+
+static int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
+{
+    BufferSourceContext *c = s->priv;
+    int ret;
+
+    if (!buf) {
+        c->eof = 1;
+        return 0;
+    } else if (c->eof)
+        return AVERROR(EINVAL);
+
+    if (!av_fifo_space(c->fifo) &&
+        (ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
+                                         sizeof(buf))) < 0)
+        return ret;
+
+    switch (s->outputs[0]->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        CHECK_VIDEO_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        CHECK_AUDIO_PARAM_CHANGE(s, c, buf->audio->sample_rate, buf->audio->channel_layout,
+                                 buf->format);
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
+        return ret;
+
+    return 0;
+}
+
+static av_cold int init_video(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    BufferSourceContext *c = ctx->priv;
+    char pix_fmt_str[128];
+    int n = 0;
+
+    if (!args ||
+        (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
+                    &c->time_base.num, &c->time_base.den,
+                    &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
+        av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
+        return AVERROR(EINVAL);
+    }
+    if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
+        char *tail;
+        c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
+        if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
+            return AVERROR(EINVAL);
+        }
+    }
+
+    if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
+        return AVERROR(ENOMEM);
+
+    av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
+    return 0;
+}
+
+#define OFFSET(x) offsetof(BufferSourceContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+static const AVOption audio_options[] = {
+    { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { 0 }, 0, INT_MAX, A },
+    { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { 0 }, 0, INT_MAX, A },
+    { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },
+    { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
+    { NULL },
+};
+
+static const AVClass abuffer_class = {
+    .class_name = "abuffer source",
+    .item_name  = av_default_item_name,
+    .option     = audio_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static av_cold int init_audio(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    BufferSourceContext *s = ctx->priv;
+    int ret = 0;
+
+    s->class = &abuffer_class;
+    av_opt_set_defaults(s);
+
+    if ((ret = av_set_options_string(s, args, "=", ":")) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: %s.\n", args);
+        goto fail;
+    }
+
+    s->sample_fmt = av_get_sample_fmt(s->sample_fmt_str);
+    if (s->sample_fmt == AV_SAMPLE_FMT_NONE) {
+        av_log(ctx, AV_LOG_ERROR, "Invalid sample format %s.\n",
+               s->sample_fmt_str);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    s->channel_layout = av_get_channel_layout(s->channel_layout_str);
+    if (!s->channel_layout) {
+        av_log(ctx, AV_LOG_ERROR, "Invalid channel layout %s.\n",
+               s->channel_layout_str);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (!(s->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*)))) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    if (!s->time_base.num)
+        s->time_base = (AVRational){1, s->sample_rate};
+
+    av_log(ctx, AV_LOG_VERBOSE, "tb:%d/%d samplefmt:%s samplerate: %d "
+           "ch layout:%s\n", s->time_base.num, s->time_base.den, s->sample_fmt_str,
+           s->sample_rate, s->channel_layout_str);
+
+fail:
+    av_opt_free(s);
+    return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    BufferSourceContext *s = ctx->priv;
+    while (s->fifo && av_fifo_size(s->fifo)) {
+        AVFilterBufferRef *buf;
+        av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
+        avfilter_unref_buffer(buf);
+    }
+    av_fifo_free(s->fifo);
+    s->fifo = NULL;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    BufferSourceContext *c = ctx->priv;
+    AVFilterChannelLayouts *channel_layouts = NULL;
+    AVFilterFormats *formats = NULL;
+    AVFilterFormats *samplerates = NULL;
+
+    switch (ctx->outputs[0]->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        avfilter_add_format(&formats, c->pix_fmt);
+        avfilter_set_common_formats(ctx, formats);
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        avfilter_add_format(&formats,           c->sample_fmt);
+        avfilter_set_common_formats(ctx, formats);
+
+        avfilter_add_format(&samplerates,       c->sample_rate);
+        ff_set_common_samplerates(ctx, samplerates);
+
+        ff_add_channel_layout(&channel_layouts, c->channel_layout);
+        ff_set_common_channel_layouts(ctx, channel_layouts);
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+static int config_props(AVFilterLink *link)
+{
+    BufferSourceContext *c = link->src->priv;
+
+    switch (link->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        link->w = c->w;
+        link->h = c->h;
+        link->sample_aspect_ratio = c->pixel_aspect;
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        link->channel_layout = c->channel_layout;
+        link->sample_rate    = c->sample_rate;
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    link->time_base = c->time_base;
+    return 0;
+}
+
+static int request_frame(AVFilterLink *link)
+{
+    BufferSourceContext *c = link->src->priv;
+    AVFilterBufferRef *buf;
+
+    if (!av_fifo_size(c->fifo)) {
+        if (c->eof)
+            return AVERROR_EOF;
+        return AVERROR(EAGAIN);
+    }
+    av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
+
+    switch (link->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        avfilter_start_frame(link, avfilter_ref_buffer(buf, ~0));
+        avfilter_draw_slice(link, 0, link->h, 1);
+        avfilter_end_frame(link);
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        ff_filter_samples(link, avfilter_ref_buffer(buf, ~0));
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    avfilter_unref_buffer(buf);
+
+    return 0;
+}
+
+static int poll_frame(AVFilterLink *link)
+{
+    BufferSourceContext *c = link->src->priv;
+    int size = av_fifo_size(c->fifo);
+    if (!size && c->eof)
+        return AVERROR_EOF;
+    return size/sizeof(AVFilterBufferRef*);
+}
+
+AVFilter avfilter_vsrc_buffer = {
+    .name      = "buffer",
+    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
+    .priv_size = sizeof(BufferSourceContext),
+    .query_formats = query_formats,
+
+    .init      = init_video,
+    .uninit    = uninit,
+
+    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
+    .outputs   = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AVMEDIA_TYPE_VIDEO,
+                                    .request_frame   = request_frame,
+                                    .poll_frame      = poll_frame,
+                                    .config_props    = config_props, },
+                                  { .name = NULL}},
+};
+
+AVFilter avfilter_asrc_abuffer = {
+    .name          = "abuffer",
+    .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
+    .priv_size     = sizeof(BufferSourceContext),
+    .query_formats = query_formats,
+
+    .init      = init_audio,
+    .uninit    = uninit,
+
+    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
+    .outputs   = (AVFilterPad[]) {{ .name            = "default",
+                                    .type            = AVMEDIA_TYPE_AUDIO,
+                                    .request_frame   = request_frame,
+                                    .poll_frame      = poll_frame,
+                                    .config_props    = config_props, },
+                                  { .name = NULL}},
+};
diff --git a/libavfilter/buffersrc.h b/libavfilter/buffersrc.h
index f1f566b46e..25e2fbf6dc 100644
--- a/libavfilter/buffersrc.h
+++ b/libavfilter/buffersrc.h
@@ -62,4 +62,15 @@ int av_buffersrc_add_ref(AVFilterContext *buffer_src,
  */
 unsigned av_buffersrc_get_nb_failed_requests(AVFilterContext *buffer_src);
 
+/**
+ * Add a frame to the buffer source.
+ *
+ * @param s an instance of the buffersrc filter.
+ * @param frame frame to be added.
+ *
+ * @warning frame data will be memcpy()ed, which may be a big performance
+ *          hit. Use av_buffersrc_buffer() to avoid copying the data.
+ */
+int av_buffersrc_write_frame(AVFilterContext *s, AVFrame *frame);
+
 #endif /* AVFILTER_BUFFERSRC_H */
diff --git a/libavfilter/defaults.c b/libavfilter/defaults.c
index d2e01499be..31dc18d9f7 100644
--- a/libavfilter/defaults.c
+++ b/libavfilter/defaults.c
@@ -26,111 +26,7 @@
 
 #include "avfilter.h"
 #include "internal.h"
-
-void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
-{
-    if (ptr->extended_data != ptr->data)
-        av_freep(&ptr->extended_data);
-    av_free(ptr->data[0]);
-    av_free(ptr);
-}
-
-/* TODO: set the buffer's priv member to a context structure for the whole
- * filter chain.  This will allow for a buffer pool instead of the constant
- * alloc & free cycle currently implemented. */
-AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
-{
-    int linesize[4];
-    uint8_t *data[4];
-    int i;
-    AVFilterBufferRef *picref = NULL;
-    AVFilterPool *pool = link->pool;
-
-    if (pool) {
-        for (i = 0; i < POOL_SIZE; i++) {
-            picref = pool->pic[i];
-            if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
-                AVFilterBuffer *pic = picref->buf;
-                pool->pic[i] = NULL;
-                pool->count--;
-                picref->video->w = w;
-                picref->video->h = h;
-                picref->perms = perms | AV_PERM_READ;
-                picref->format = link->format;
-                pic->refcount = 1;
-                memcpy(picref->data,     pic->data,     sizeof(picref->data));
-                memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
-                pool->refcount++;
-                return picref;
-            }
-        }
-    } else {
-        pool = link->pool = av_mallocz(sizeof(AVFilterPool));
-        pool->refcount = 1;
-    }
-
-    // align: +2 is needed for swscaler, +16 to be SIMD-friendly
-    if ((i = av_image_alloc(data, linesize, w, h, link->format, 32)) < 0)
-        return NULL;
-
-    picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
-                                                       perms, w, h, link->format);
-    if (!picref) {
-        av_free(data[0]);
-        return NULL;
-    }
-    memset(data[0], 128, i);
-
-    picref->buf->priv = pool;
-    picref->buf->free = NULL;
-    pool->refcount++;
-
-    return picref;
-}
-
-void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
-{
-    AVFilterLink *outlink = NULL;
-
-    if (inlink->dst->output_count)
-        outlink = inlink->dst->outputs[0];
-
-    if (outlink) {
-        outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
-        avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
-        avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
-    }
-}
-
-void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
-{
-    AVFilterLink *outlink = NULL;
-
-    if (inlink->dst->output_count)
-        outlink = inlink->dst->outputs[0];
-
-    if (outlink)
-        avfilter_draw_slice(outlink, y, h, slice_dir);
-}
-
-void avfilter_default_end_frame(AVFilterLink *inlink)
-{
-    AVFilterLink *outlink = NULL;
-
-    if (inlink->dst->output_count)
-        outlink = inlink->dst->outputs[0];
-
-    avfilter_unref_buffer(inlink->cur_buf);
-    inlink->cur_buf = NULL;
-
-    if (outlink) {
-        if (outlink->out_buf) {
-            avfilter_unref_buffer(outlink->out_buf);
-            outlink->out_buf = NULL;
-        }
-        avfilter_end_frame(outlink);
-    }
-}
+#include "formats.h"
 
 static void set_common_formats(AVFilterContext *ctx, AVFilterFormats *fmts,
                                enum AVMediaType type, int offin, int offout)
@@ -170,8 +66,8 @@ void avfilter_set_common_sample_formats(AVFilterContext *ctx, AVFilterFormats *f
 void avfilter_set_common_channel_layouts(AVFilterContext *ctx, AVFilterFormats *formats)
 {
     set_common_formats(ctx, formats, AVMEDIA_TYPE_AUDIO,
-                       offsetof(AVFilterLink, in_chlayouts),
-                       offsetof(AVFilterLink, out_chlayouts));
+                       offsetof(AVFilterLink, in_channel_layouts),
+                       offsetof(AVFilterLink, out_channel_layouts));
 }
 
 void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *formats)
@@ -180,33 +76,3 @@ void avfilter_set_common_packing_formats(AVFilterContext *ctx, AVFilterFormats *
                        offsetof(AVFilterLink, in_packing),
                        offsetof(AVFilterLink, out_packing));
 }
-
-int avfilter_default_query_formats(AVFilterContext *ctx)
-{
-    avfilter_set_common_pixel_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_VIDEO));
-    avfilter_set_common_sample_formats(ctx, avfilter_make_all_formats(AVMEDIA_TYPE_AUDIO));
-    avfilter_set_common_channel_layouts(ctx, avfilter_make_all_channel_layouts());
-    avfilter_set_common_packing_formats(ctx, avfilter_make_all_packing_formats());
-
-    return 0;
-}
-
-void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
-{
-    avfilter_start_frame(link->dst->outputs[0], picref);
-}
-
-void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
-{
-    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
-}
-
-void avfilter_null_end_frame(AVFilterLink *link)
-{
-    avfilter_end_frame(link->dst->outputs[0]);
-}
-
-AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
-{
-    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
-}
diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index 569178fca8..41c6da92b7 100644
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -24,63 +24,138 @@
 #include "libavutil/audioconvert.h"
 #include "avfilter.h"
 #include "internal.h"
+#include "formats.h"
 
 /**
  * Add all refs from a to ret and destroy a.
  */
-static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
-{
-    int i;
-
-    for (i = 0; i < a->refcount; i++) {
-        ret->refs[ret->refcount] = a->refs[i];
-        *ret->refs[ret->refcount++] = ret;
-    }
+#define MERGE_REF(ret, a, fmts, type, fail)                                \
+do {                                                                       \
+    type ***tmp;                                                           \
+    int i;                                                                 \
+                                                                           \
+    if (!(tmp = av_realloc(ret->refs,                                      \
+                           sizeof(*tmp) * (ret->refcount + a->refcount)))) \
+        goto fail;                                                         \
+    ret->refs = tmp;                                                       \
+                                                                           \
+    for (i = 0; i < a->refcount; i ++) {                                   \
+        ret->refs[ret->refcount] = a->refs[i];                             \
+        *ret->refs[ret->refcount++] = ret;                                 \
+    }                                                                      \
+                                                                           \
+    av_freep(&a->refs);                                                    \
+    av_freep(&a->fmts);                                                    \
+    av_freep(&a);                                                          \
+} while (0)
 
-    av_free(a->refs);
-    av_free(a->formats);
-    av_free(a);
-}
+/**
+ * Add all formats common for a and b to ret, copy the refs and destroy
+ * a and b.
+ */
+#define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail)                          \
+do {                                                                            \
+    int i, j, k = 0, count = FFMIN(a->nb, b->nb);                               \
+                                                                                \
+    if (!(ret = av_mallocz(sizeof(*ret))))                                      \
+        goto fail;                                                              \
+                                                                                \
+    if (count) {                                                                \
+        if (!(ret->fmts = av_malloc(sizeof(*ret->fmts) * count)))               \
+            goto fail;                                                          \
+        for (i = 0; i < a->nb; i++)                                             \
+            for (j = 0; j < b->nb; j++)                                         \
+                if (a->fmts[i] == b->fmts[j]) {                                 \
+                    if(k >= FFMIN(a->nb, b->nb)){                               \
+                        av_log(0, AV_LOG_ERROR, "Duplicate formats in avfilter_merge_formats() detected\n"); \
+                        av_free(ret->fmts);                                     \
+                        av_free(ret);                                           \
+                        return NULL;                                            \
+                    }                                                           \
+                    ret->fmts[k++] = a->fmts[i];                                \
+                }                                                               \
+    }                                                                           \
+    ret->nb = k;                                                                \
+    /* check that there was at least one common format */                       \
+    if (!ret->nb)                                                               \
+        goto fail;                                                              \
+                                                                                \
+    MERGE_REF(ret, a, fmts, type, fail);                                        \
+    MERGE_REF(ret, b, fmts, type, fail);                                        \
+} while (0)
 
 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
 {
-    AVFilterFormats *ret;
-    unsigned i, j, k = 0;
+    AVFilterFormats *ret = NULL;
 
     if (a == b)
         return a;
 
-    ret = av_mallocz(sizeof(*ret));
-
-    /* merge list of formats */
-    ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count,
-                                                           b->format_count));
-    for (i = 0; i < a->format_count; i++)
-        for (j = 0; j < b->format_count; j++)
-            if (a->formats[i] == b->formats[j]){
-                if(k >= FFMIN(a->format_count, b->format_count)){
-                    av_log(0, AV_LOG_ERROR, "Duplicate formats in avfilter_merge_formats() detected\n");
-                    av_free(ret->formats);
-                    av_free(ret);
-                    return NULL;
-                }
-                ret->formats[k++] = a->formats[i];
-            }
-
-    ret->format_count = k;
-    /* check that there was at least one common format */
-    if (!ret->format_count) {
-        av_free(ret->formats);
-        av_free(ret);
-        return NULL;
+    MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
+
+    return ret;
+fail:
+    if (ret) {
+        av_freep(&ret->refs);
+        av_freep(&ret->formats);
     }
+    av_freep(&ret);
+    return NULL;
+}
+
+AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
+                                      AVFilterFormats *b)
+{
+    AVFilterFormats *ret = NULL;
 
-    ret->refs = av_malloc(sizeof(*ret->refs) * (a->refcount + b->refcount));
+    if (a == b) return a;
 
-    merge_ref(ret, a);
-    merge_ref(ret, b);
+    if (a->format_count && b->format_count) {
+        MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
+    } else if (a->format_count) {
+        MERGE_REF(a, b, formats, AVFilterFormats, fail);
+        ret = a;
+    } else {
+        MERGE_REF(b, a, formats, AVFilterFormats, fail);
+        ret = b;
+    }
 
     return ret;
+fail:
+    if (ret) {
+        av_freep(&ret->refs);
+        av_freep(&ret->formats);
+    }
+    av_freep(&ret);
+    return NULL;
+}
+
+AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
+                                                 AVFilterChannelLayouts *b)
+{
+    AVFilterChannelLayouts *ret = NULL;
+
+    if (a == b) return a;
+
+    if (a->nb_channel_layouts && b->nb_channel_layouts) {
+        MERGE_FORMATS(ret, a, b, channel_layouts, nb_channel_layouts,
+                      AVFilterChannelLayouts, fail);
+    } else if (a->nb_channel_layouts) {
+        MERGE_REF(a, b, channel_layouts, AVFilterChannelLayouts, fail);
+        ret = a;
+    } else {
+        MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
+        ret = b;
+    }
+
+    return ret;
+fail:
+    if (ret) {
+        av_freep(&ret->refs);
+        av_freep(&ret->channel_layouts);
+    }
+    av_freep(&ret);
+    return NULL;
 }
 
 int ff_fmt_is_in(int fmt, const int *fmts)
@@ -146,30 +221,40 @@ AVFilterFormats *avfilter_make_format_list(const int *fmts)
     return formats;
 }
 
-AVFilterFormats *avfilter_make_format64_list(const int64_t *fmts)
+AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts)
 {
     MAKE_FORMAT_LIST();
     if (count)
         memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
 
-    return formats;
+    return (AVFilterChannelLayouts*)formats;
 }
 
+#define ADD_FORMAT(f, fmt, type, list, nb)                  \
+do {                                                        \
+    type *fmts;                                             \
+                                                            \
+    if (!(*f) && !(*f = av_mallocz(sizeof(**f))))           \
+        return AVERROR(ENOMEM);                             \
+                                                            \
+    fmts = av_realloc((*f)->list,                           \
+                      sizeof(*(*f)->list) * ((*f)->nb + 1));\
+    if (!fmts)                                              \
+        return AVERROR(ENOMEM);                             \
+                                                            \
+    (*f)->list = fmts;                                      \
+    (*f)->list[(*f)->nb++] = fmt;                           \
+    return 0;                                               \
+} while (0)
+
 int avfilter_add_format(AVFilterFormats **avff, int64_t fmt)
 {
-    int64_t *fmts;
-
-    if (!(*avff) && !(*avff = av_mallocz(sizeof(**avff))))
-        return AVERROR(ENOMEM);
-
-    fmts = av_realloc((*avff)->formats,
-                      sizeof(*(*avff)->formats) * ((*avff)->format_count+1));
-    if (!fmts)
-        return AVERROR(ENOMEM);
+    ADD_FORMAT(avff, fmt, int64_t, formats, format_count);
+}
 
-    (*avff)->formats = fmts;
-    (*avff)->formats[(*avff)->format_count++] = fmt;
-    return 0;
+int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
+{
+    ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
 }
 
 #if FF_API_OLD_ALL_FORMATS_API
@@ -199,10 +284,10 @@ const int64_t avfilter_all_channel_layouts[] = {
     -1
 };
 
-AVFilterFormats *avfilter_make_all_channel_layouts(void)
-{
-    return avfilter_make_format64_list(avfilter_all_channel_layouts);
-}
+// AVFilterFormats *avfilter_make_all_channel_layouts(void)
+// {
+//     return avfilter_make_format64_list(avfilter_all_channel_layouts);
+// }
 
 AVFilterFormats *avfilter_make_all_packing_formats(void)
 {
@@ -215,53 +300,163 @@ AVFilterFormats *avfilter_make_all_packing_formats(void)
     return avfilter_make_format_list(packing);
 }
 
-void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
+AVFilterFormats *ff_all_samplerates(void)
 {
-    *ref = f;
-    f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount);
-    f->refs[f->refcount-1] = ref;
+    AVFilterFormats *ret = av_mallocz(sizeof(*ret));
+    return ret;
 }
 
-static int find_ref_index(AVFilterFormats **ref)
+AVFilterChannelLayouts *ff_all_channel_layouts(void)
 {
-    int i;
-    for (i = 0; i < (*ref)->refcount; i++)
-        if ((*ref)->refs[i] == ref)
-            return i;
-    return -1;
+    AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
+    return ret;
 }
 
-void avfilter_formats_unref(AVFilterFormats **ref)
+#define FORMATS_REF(f, ref)                                          \
+do {                                                                 \
+    *ref = f;                                                        \
+    f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
+    f->refs[f->refcount-1] = ref;                                    \
+} while (0)
+
+void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
+{
+    FORMATS_REF(f, ref);
+}
+
+void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 {
-    int idx;
+    FORMATS_REF(f, ref);
+}
 
-    if (!*ref)
-        return;
+#define FIND_REF_INDEX(ref, idx)            \
+do {                                        \
+    int i;                                  \
+    for (i = 0; i < (*ref)->refcount; i ++) \
+        if((*ref)->refs[i] == ref) {        \
+            idx = i;                        \
+            break;                          \
+        }                                   \
+} while (0)
+
+#define FORMATS_UNREF(ref, list)                                   \
+do {                                                               \
+    int idx = -1;                                                  \
+                                                                   \
+    if (!*ref)                                                     \
+        return;                                                    \
+                                                                   \
+    FIND_REF_INDEX(ref, idx);                                      \
+                                                                   \
+    if (idx >= 0)                                                  \
+        memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,        \
+            sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
+                                                                   \
+    if(!--(*ref)->refcount) {                                      \
+        av_free((*ref)->list);                                     \
+        av_free((*ref)->refs);                                     \
+        av_free(*ref);                                             \
+    }                                                              \
+    *ref = NULL;                                                   \
+} while (0)
 
-    idx = find_ref_index(ref);
+void avfilter_formats_unref(AVFilterFormats **ref)
+{
+    FORMATS_UNREF(ref, formats);
+}
 
-    if(idx >= 0)
-        memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,
-            sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1));
+void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
+{
+    FORMATS_UNREF(ref, channel_layouts);
+}
 
-    if (!--(*ref)->refcount) {
-        av_free((*ref)->formats);
-        av_free((*ref)->refs);
-        av_free(*ref);
-    }
-    *ref = NULL;
+#define FORMATS_CHANGEREF(oldref, newref)       \
+do {                                            \
+    int idx = -1;                               \
+                                                \
+    FIND_REF_INDEX(oldref, idx);                \
+                                                \
+    if (idx >= 0) {                             \
+        (*oldref)->refs[idx] = newref;          \
+        *newref = *oldref;                      \
+        *oldref = NULL;                         \
+    }                                           \
+} while (0)
+
+void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
+                                  AVFilterChannelLayouts **newref)
+{
+    FORMATS_CHANGEREF(oldref, newref);
 }
 
 void avfilter_formats_changeref(AVFilterFormats **oldref,
                                 AVFilterFormats **newref)
 {
-    int idx = find_ref_index(oldref);
+    FORMATS_CHANGEREF(oldref, newref);
+}
+
+#define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
+{                                                                   \
+    int count = 0, i;                                               \
+                                                                    \
+    for (i = 0; i < ctx->input_count; i++) {                        \
+        if (ctx->inputs[i]) {                                       \
+            ref(fmts, &ctx->inputs[i]->out_fmts);                   \
+            count++;                                                \
+        }                                                           \
+    }                                                               \
+    for (i = 0; i < ctx->output_count; i++) {                       \
+        if (ctx->outputs[i]) {                                      \
+            ref(fmts, &ctx->outputs[i]->in_fmts);                   \
+            count++;                                                \
+        }                                                           \
+    }                                                               \
+                                                                    \
+    if (!count) {                                                   \
+        av_freep(&fmts->list);                                      \
+        av_freep(&fmts->refs);                                      \
+        av_freep(&fmts);                                            \
+    }                                                               \
+}
+
+void ff_set_common_channel_layouts(AVFilterContext *ctx,
+                                   AVFilterChannelLayouts *layouts)
+{
+    SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
+                       ff_channel_layouts_ref, channel_layouts);
+}
+
+void ff_set_common_samplerates(AVFilterContext *ctx,
+                               AVFilterFormats *samplerates)
+{
+    SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
+                       avfilter_formats_ref, formats);
+}
+
+/**
+ * A helper for query_formats() which sets all links to the same list of
+ * formats. If there are no links hooked to this filter, the list of formats is
+ * freed.
+ */
+void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
+{
+    SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
+                       avfilter_formats_ref, formats);
+}
 
-    if (idx >= 0) {
-        (*oldref)->refs[idx] = newref;
-        *newref = *oldref;
-        *oldref = NULL;
+int avfilter_default_query_formats(AVFilterContext *ctx)
+{
+    enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
+                            ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
+                            AVMEDIA_TYPE_VIDEO;
+
+    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
+    if (type == AVMEDIA_TYPE_AUDIO) {
+        ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
+        ff_set_common_samplerates(ctx, ff_all_samplerates());
     }
+
+    return 0;
 }
 
 /* internal functions for parsing audio format arguments */
diff --git a/libavfilter/formats.h b/libavfilter/formats.h
new file mode 100644
index 0000000000..7b0eab5dea
--- /dev/null
+++ b/libavfilter/formats.h
@@ -0,0 +1,81 @@
+/*
+ * This file is part of FFMpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFILTER_FORMATS_H
+#define AVFILTER_FORMATS_H
+
+#include "avfilter.h"
+
+typedef struct AVFilterChannelLayouts {
+    uint64_t *channel_layouts;  ///< list of channel layouts
+    int    nb_channel_layouts;  ///< number of channel layouts
+
+    unsigned refcount;          ///< number of references to this list
+    struct AVFilterChannelLayouts ***refs; ///< references to this list
+} AVFilterChannelLayouts;
+
+/**
+ * Return a channel layouts/samplerates list which contains the intersection of
+ * the layouts/samplerates of a and b. Also, all the references of a, all the
+ * references of b, and a and b themselves will be deallocated.
+ *
+ * If a and b do not share any common elements, neither is modified, and NULL
+ * is returned.
+ */
+AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
+                                                 AVFilterChannelLayouts *b);
+AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
+                                      AVFilterFormats *b);
+
+/**
+ * Construct an empty AVFilterChannelLayouts/AVFilterFormats struct --
+ * representing any channel layout/sample rate.
+ */
+AVFilterChannelLayouts *ff_all_channel_layouts(void);
+AVFilterFormats *ff_all_samplerates(void);
+
+AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts);
+
+
+/**
+ * A helper for query_formats() which sets all links to the same list of channel
+ * layouts/sample rates. If there are no links hooked to this filter, the list
+ * is freed.
+ */
+void ff_set_common_channel_layouts(AVFilterContext *ctx,
+                                   AVFilterChannelLayouts *layouts);
+void ff_set_common_samplerates(AVFilterContext *ctx,
+                               AVFilterFormats *samplerates);
+
+int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout);
+
+/**
+ * Add *ref as a new reference to f.
+ */
+void ff_channel_layouts_ref(AVFilterChannelLayouts *f,
+                            AVFilterChannelLayouts **ref);
+
+/**
+ * Remove a reference to a channel layouts list.
+ */
+void ff_channel_layouts_unref(AVFilterChannelLayouts **ref);
+
+void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
+                                  AVFilterChannelLayouts **newref);
+
+#endif // AVFILTER_FORMATS_H
diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 09d605541f..034a6c9cab 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -26,6 +26,7 @@
 
 #include "avfilter.h"
 #include "avfiltergraph.h"
+#include "formats.h"
 
 #define POOL_SIZE 32
 typedef struct AVFilterPool {
@@ -151,6 +152,10 @@ static inline void ff_null_start_frame_keep_ref(AVFilterLink *inlink,
 
 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
 
+void ff_free_pool(AVFilterPool *pool);
+
+void ff_command_queue_pop(AVFilterContext *filter);
+
 #define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
 
 void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
diff --git a/libavfilter/sink_buffer.c b/libavfilter/sink_buffer.c
index b0cc519217..ab7aa4f5a8 100644
--- a/libavfilter/sink_buffer.c
+++ b/libavfilter/sink_buffer.c
@@ -269,19 +269,22 @@ static int asink_query_formats(AVFilterContext *ctx)
 {
     BufferSinkContext *buf = ctx->priv;
     AVFilterFormats *formats = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
 
     if (!(formats = avfilter_make_format_list(buf->sample_fmts)))
         return AVERROR(ENOMEM);
     avfilter_set_common_sample_formats(ctx, formats);
 
-    if (!(formats = avfilter_make_format64_list(buf->channel_layouts)))
+    if (!(layouts = avfilter_make_format64_list(buf->channel_layouts)))
         return AVERROR(ENOMEM);
-    avfilter_set_common_channel_layouts(ctx, formats);
+    ff_set_common_channel_layouts(ctx, layouts);
 
     if (!(formats = avfilter_make_format_list(buf->packing_fmts)))
         return AVERROR(ENOMEM);
     avfilter_set_common_packing_formats(ctx, formats);
 
+    ff_set_common_samplerates          (ctx, ff_all_samplerates());
+
     return 0;
 }
 
diff --git a/libavfilter/src_buffer.c b/libavfilter/src_buffer.c
index f8d572d085..cadc4ee2a4 100644
--- a/libavfilter/src_buffer.c
+++ b/libavfilter/src_buffer.c
@@ -507,14 +507,15 @@ static int query_formats_audio(AVFilterContext *ctx)
 {
     BufferSourceContext *abuffer = ctx->priv;
     AVFilterFormats *formats;
+    AVFilterChannelLayouts *layouts;
 
     formats = NULL;
     avfilter_add_format(&formats, abuffer->sample_format);
     avfilter_set_common_sample_formats(ctx, formats);
 
-    formats = NULL;
-    avfilter_add_format(&formats, abuffer->channel_layout);
-    avfilter_set_common_channel_layouts(ctx, formats);
+    layouts = NULL;
+    ff_add_channel_layout(&layouts, abuffer->channel_layout);
+    ff_set_common_channel_layouts(ctx, layouts);
 
     formats = NULL;
     avfilter_add_format(&formats, abuffer->packing_format);
@@ -653,8 +654,6 @@ AVFilter avfilter_vsrc_buffer = {
                                   { .name = NULL}},
 };
 
-#if CONFIG_ABUFFER_FILTER
-
 AVFilter avfilter_asrc_abuffer = {
     .name        = "abuffer",
     .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
@@ -673,4 +672,3 @@ AVFilter avfilter_asrc_abuffer = {
                                     { .name = NULL}},
 };
 
-#endif
diff --git a/libavfilter/src_movie.c b/libavfilter/src_movie.c
index a00d30d9cf..30624559fc 100644
--- a/libavfilter/src_movie.c
+++ b/libavfilter/src_movie.c
@@ -38,6 +38,7 @@
 #include "audio.h"
 #include "avcodec.h"
 #include "avfilter.h"
+#include "formats.h"
 
 typedef struct {
     /* common A/V fields */
@@ -370,12 +371,14 @@ static int amovie_query_formats(AVFilterContext *ctx)
 
     enum AVSampleFormat sample_fmts[] = { c->sample_fmt, -1 };
     int packing_fmts[] = { AVFILTER_PACKED, -1 };
+    int sample_rates[] = { c->sample_rate, -1 };
     int64_t chlayouts[] = { c->channel_layout ? c->channel_layout :
                             av_get_default_channel_layout(c->channels), -1 };
 
     avfilter_set_common_sample_formats (ctx, avfilter_make_format_list(sample_fmts));
     avfilter_set_common_packing_formats(ctx, avfilter_make_format_list(packing_fmts));
-    avfilter_set_common_channel_layouts(ctx, avfilter_make_format64_list(chlayouts));
+    ff_set_common_samplerates          (ctx, avfilter_make_format_list(sample_rates));
+    ff_set_common_channel_layouts(ctx, avfilter_make_format64_list(chlayouts));
 
     return 0;
 }
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 05318047f4..a8e4f893d4 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR 73
+#define LIBAVFILTER_VERSION_MINOR 74
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
@@ -50,5 +50,8 @@
 #ifndef FF_API_SAMPLERATE64
 #define FF_API_SAMPLERATE64             (LIBAVFILTER_VERSION_MAJOR < 3)
 #endif
+#ifndef FF_API_VSRC_BUFFER_ADD_FRAME
+#define FF_API_VSRC_BUFFER_ADD_FRAME        (LIBAVFILTER_VERSION_MAJOR < 3)
+#endif
 
 #endif // AVFILTER_VERSION_H
diff --git a/libavfilter/vf_yadif.c b/libavfilter/vf_yadif.c
index 684f9099fa..fb4862d0be 100644
--- a/libavfilter/vf_yadif.c
+++ b/libavfilter/vf_yadif.c
@@ -59,6 +59,7 @@ typedef struct {
                         int w, int prefs, int mrefs, int parity, int mode);
 
     const AVPixFmtDescriptor *csp;
+    int eof;
 } YADIFContext;
 
 #define CHECK(j)\
@@ -216,22 +217,11 @@ static void return_frame(AVFilterContext *ctx, int is_second)
     filter(ctx, yadif->out, tff ^ !is_second, tff);
 
     if (is_second) {
-        if (yadif->next->pts != AV_NOPTS_VALUE &&
-            yadif->cur->pts != AV_NOPTS_VALUE) {
-            uint64_t next_pts = yadif->next->pts;
-            uint64_t cur_pts  = yadif->cur->pts;
-            uint64_t prev_pts = yadif->prev->pts;
-
-            uint64_t ft = FFMIN3( cur_pts-prev_pts,
-                                  next_pts-cur_pts,
-                                 (next_pts-prev_pts)/2);
-
-            if(next_pts - cur_pts < 2*ft)
-                yadif->out->pts =
-                    (next_pts&cur_pts) +
-                    ((next_pts^cur_pts)>>1);
-            else
-                yadif->out->pts = cur_pts + ft/2;
+        int64_t cur_pts  = yadif->cur->pts;
+        int64_t next_pts = yadif->next->pts;
+
+        if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) {
+            yadif->out->pts = cur_pts + next_pts;
         } else {
             yadif->out->pts = AV_NOPTS_VALUE;
         }
@@ -264,6 +254,8 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
         yadif->out  = avfilter_ref_buffer(yadif->cur, AV_PERM_READ);
         avfilter_unref_buffer(yadif->prev);
         yadif->prev = NULL;
+        if (yadif->out->pts != AV_NOPTS_VALUE)
+            yadif->out->pts *= 2;
         avfilter_start_frame(ctx->outputs[0], yadif->out);
         return;
     }
@@ -276,6 +268,8 @@ static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 
     avfilter_copy_buffer_ref_props(yadif->out, yadif->cur);
     yadif->out->video->interlaced = 0;
+    if (yadif->out->pts != AV_NOPTS_VALUE)
+        yadif->out->pts *= 2;
     avfilter_start_frame(ctx->outputs[0], yadif->out);
 }
 
@@ -309,8 +303,21 @@ static int request_frame(AVFilterLink *link)
     do {
         int ret;
 
-        if ((ret = avfilter_request_frame(link->src->inputs[0])))
+        if (yadif->eof)
+            return AVERROR_EOF;
+
+        ret  = avfilter_request_frame(link->src->inputs[0]);
+
+        if (ret == AVERROR_EOF && yadif->next) {
+            AVFilterBufferRef *next = avfilter_ref_buffer(yadif->next, AV_PERM_READ);
+            next->pts = yadif->next->pts * 2 - yadif->cur->pts;
+
+            start_frame(link->src->inputs[0], next);
+            end_frame(link->src->inputs[0]);
+            yadif->eof = 1;
+        } else if (ret < 0) {
             return ret;
+        }
     } while (!yadif->cur);
 
     return 0;
@@ -411,6 +418,16 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 
 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
 
+static int config_props(AVFilterLink *link)
+{
+    link->time_base.num = link->src->inputs[0]->time_base.num;
+    link->time_base.den = link->src->inputs[0]->time_base.den * 2;
+    link->w             = link->src->inputs[0]->w;
+    link->h             = link->src->inputs[0]->h;
+
+    return 0;
+}
+
 AVFilter avfilter_vf_yadif = {
     .name          = "yadif",
     .description   = NULL_IF_CONFIG_SMALL("Deinterlace the input image."),
@@ -432,6 +449,7 @@ AVFilter avfilter_vf_yadif = {
     .outputs   = (const AVFilterPad[]) {{ .name       = "default",
                                     .type             = AVMEDIA_TYPE_VIDEO,
                                     .poll_frame       = poll_frame,
-                                    .request_frame    = request_frame, },
+                                    .request_frame    = request_frame,
+                                    .config_props     = config_props, },
                                   { .name = NULL}},
 };
diff --git a/libavfilter/video.c b/libavfilter/video.c
new file mode 100644
index 0000000000..86dfd901f8
--- /dev/null
+++ b/libavfilter/video.c
@@ -0,0 +1,345 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/imgutils.h"
+
+#include "avfilter.h"
+#include "internal.h"
+
+static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
+{
+    snprintf(buf, buf_size, "%s%s%s%s%s%s",
+             perms & AV_PERM_READ      ? "r" : "",
+             perms & AV_PERM_WRITE     ? "w" : "",
+             perms & AV_PERM_PRESERVE  ? "p" : "",
+             perms & AV_PERM_REUSE     ? "u" : "",
+             perms & AV_PERM_REUSE2    ? "U" : "",
+             perms & AV_PERM_NEG_LINESIZES ? "n" : "");
+    return buf;
+}
+
+static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
+{
+    av_unused char buf[16];
+    av_dlog(ctx,
+            "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
+            ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
+            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
+            ref->pts, ref->pos);
+
+    if (ref->video) {
+        av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
+                ref->video->sample_aspect_ratio.num, ref->video->sample_aspect_ratio.den,
+                ref->video->w, ref->video->h,
+                !ref->video->interlaced     ? 'P' :         /* Progressive  */
+                ref->video->top_field_first ? 'T' : 'B',    /* Top / Bottom */
+                ref->video->key_frame,
+                av_get_picture_type_char(ref->video->pict_type));
+    }
+    if (ref->audio) {
+        av_dlog(ctx, " cl:%"PRId64"d n:%d r:%d p:%d",
+                ref->audio->channel_layout,
+                ref->audio->nb_samples,
+                ref->audio->sample_rate,
+                ref->audio->planar);
+    }
+
+    av_dlog(ctx, "]%s", end ? "\n" : "");
+}
+
+AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
+{
+    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
+}
+
+AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
+{
+    int linesize[4];
+    uint8_t *data[4];
+    int i;
+    AVFilterBufferRef *picref = NULL;
+    AVFilterPool *pool = link->pool;
+
+    if (pool) {
+        for (i = 0; i < POOL_SIZE; i++) {
+            picref = pool->pic[i];
+            if (picref && picref->buf->format == link->format && picref->buf->w == w && picref->buf->h == h) {
+                AVFilterBuffer *pic = picref->buf;
+                pool->pic[i] = NULL;
+                pool->count--;
+                picref->video->w = w;
+                picref->video->h = h;
+                picref->perms = perms | AV_PERM_READ;
+                picref->format = link->format;
+                pic->refcount = 1;
+                memcpy(picref->data,     pic->data,     sizeof(picref->data));
+                memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
+                pool->refcount++;
+                return picref;
+            }
+        }
+    } else {
+        pool = link->pool = av_mallocz(sizeof(AVFilterPool));
+        pool->refcount = 1;
+    }
+
+    // align: +2 is needed for swscaler, +16 to be SIMD-friendly
+    if ((i = av_image_alloc(data, linesize, w, h, link->format, 32)) < 0)
+        return NULL;
+
+    picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
+                                                       perms, w, h, link->format);
+    if (!picref) {
+        av_free(data[0]);
+        return NULL;
+    }
+
+    memset(data[0], 128, i);
+
+    picref->buf->priv = pool;
+    picref->buf->free = NULL;
+    pool->refcount++;
+
+    return picref;
+}
+
+AVFilterBufferRef *
+avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
+                                          int w, int h, enum PixelFormat format)
+{
+    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
+    AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
+
+    if (!pic || !picref)
+        goto fail;
+
+    picref->buf = pic;
+    picref->buf->free = ff_avfilter_default_free_buffer;
+    if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
+        goto fail;
+
+    pic->w = picref->video->w = w;
+    pic->h = picref->video->h = h;
+
+    /* make sure the buffer gets read permission or it's useless for output */
+    picref->perms = perms | AV_PERM_READ;
+
+    pic->refcount = 1;
+    picref->type = AVMEDIA_TYPE_VIDEO;
+    pic->format = picref->format = format;
+
+    memcpy(pic->data,        data,          4*sizeof(data[0]));
+    memcpy(pic->linesize,    linesize,      4*sizeof(linesize[0]));
+    memcpy(picref->data,     pic->data,     sizeof(picref->data));
+    memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
+
+    pic->   extended_data = pic->data;
+    picref->extended_data = picref->data;
+
+    return picref;
+
+fail:
+    if (picref && picref->video)
+        av_free(picref->video);
+    av_free(picref);
+    av_free(pic);
+    return NULL;
+}
+
+AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
+{
+    AVFilterBufferRef *ret = NULL;
+
+    av_unused char buf[16];
+    FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
+    av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
+
+    if (link->dstpad->get_video_buffer)
+        ret = link->dstpad->get_video_buffer(link, perms, w, h);
+
+    if (!ret)
+        ret = avfilter_default_get_video_buffer(link, perms, w, h);
+
+    if (ret)
+        ret->type = AVMEDIA_TYPE_VIDEO;
+
+    FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
+
+    return ret;
+}
+
+void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+{
+    avfilter_start_frame(link->dst->outputs[0], picref);
+}
+
+void avfilter_default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+{
+    AVFilterLink *outlink = NULL;
+
+    if (inlink->dst->output_count)
+        outlink = inlink->dst->outputs[0];
+
+    if (outlink) {
+        outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+        avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
+        avfilter_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+    }
+}
+
+/* XXX: should we do the duplicating of the picture ref here, instead of
+ * forcing the source filter to do it? */
+void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+{
+    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
+    AVFilterPad *dst = link->dstpad;
+    int perms = picref->perms;
+    AVFilterCommand *cmd= link->dst->command_queue;
+
+    FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
+
+    if (!(start_frame = dst->start_frame))
+        start_frame = avfilter_default_start_frame;
+
+    if (picref->linesize[0] < 0)
+        perms |= AV_PERM_NEG_LINESIZES;
+    /* prepare to copy the picture if it has insufficient permissions */
+    if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
+        av_log(link->dst, AV_LOG_DEBUG,
+                "frame copy needed (have perms %x, need %x, reject %x)\n",
+                picref->perms,
+                link->dstpad->min_perms, link->dstpad->rej_perms);
+
+        link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
+        link->src_buf = picref;
+        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
+    }
+    else
+        link->cur_buf = picref;
+
+    while(cmd && cmd->time <= picref->pts * av_q2d(link->time_base)){
+        av_log(link->dst, AV_LOG_DEBUG,
+               "Processing command time:%f command:%s arg:%s\n",
+               cmd->time, cmd->command, cmd->arg);
+        avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
+        ff_command_queue_pop(link->dst);
+        cmd= link->dst->command_queue;
+    }
+
+    start_frame(link, link->cur_buf);
+    ff_update_link_current_pts(link, link->cur_buf->pts);
+}
+
+void avfilter_null_end_frame(AVFilterLink *link)
+{
+    avfilter_end_frame(link->dst->outputs[0]);
+}
+
+void avfilter_default_end_frame(AVFilterLink *inlink)
+{
+    AVFilterLink *outlink = NULL;
+
+    if (inlink->dst->output_count)
+        outlink = inlink->dst->outputs[0];
+
+    avfilter_unref_buffer(inlink->cur_buf);
+    inlink->cur_buf = NULL;
+
+    if (outlink) {
+        if (outlink->out_buf) {
+            avfilter_unref_buffer(outlink->out_buf);
+            outlink->out_buf = NULL;
+        }
+        avfilter_end_frame(outlink);
+    }
+}
+
+void avfilter_end_frame(AVFilterLink *link)
+{
+    void (*end_frame)(AVFilterLink *);
+
+    if (!(end_frame = link->dstpad->end_frame))
+        end_frame = avfilter_default_end_frame;
+
+    end_frame(link);
+
+    /* unreference the source picture if we're feeding the destination filter
+     * a copied version dues to permission issues */
+    if (link->src_buf) {
+        avfilter_unref_buffer(link->src_buf);
+        link->src_buf = NULL;
+    }
+}
+
+void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+}
+
+void avfilter_default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+    AVFilterLink *outlink = NULL;
+
+    if (inlink->dst->output_count)
+        outlink = inlink->dst->outputs[0];
+
+    if (outlink)
+        avfilter_draw_slice(outlink, y, h, slice_dir);
+}
+
+void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+{
+    uint8_t *src[4], *dst[4];
+    int i, j, vsub;
+    void (*draw_slice)(AVFilterLink *, int, int, int);
+
+    FF_DPRINTF_START(NULL, draw_slice); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
+
+    /* copy the slice if needed for permission reasons */
+    if (link->src_buf) {
+        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
+
+        for (i = 0; i < 4; i++) {
+            if (link->src_buf->data[i]) {
+                src[i] = link->src_buf-> data[i] +
+                    (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
+                dst[i] = link->cur_buf->data[i] +
+                    (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
+            } else
+                src[i] = dst[i] = NULL;
+        }
+
+        for (i = 0; i < 4; i++) {
+            int planew =
+                av_image_get_linesize(link->format, link->cur_buf->video->w, i);
+
+            if (!src[i]) continue;
+
+            for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
+                memcpy(dst[i], src[i], planew);
+                src[i] += link->src_buf->linesize[i];
+                dst[i] += link->cur_buf->linesize[i];
+            }
+        }
+    }
+
+    if (!(draw_slice = link->dstpad->draw_slice))
+        draw_slice = avfilter_default_draw_slice;
+    draw_slice(link, y, h, slice_dir);
+}
+