avformat: split muxing functions from util.c

4 files changed, 580 insertions, 517 deletions

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 4064965dc1..057c058f19 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -12,6 +12,7 @@ OBJS = allformats.o         \
        id3v1.o              \
        id3v2.o              \
        metadata.o           \
+       mux.o                \
        options.o            \
        os_support.o         \
        riff.o               \
diff --git a/libavformat/internal.h b/libavformat/internal.h
index 16475800d9..3ef46eaa20 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -345,4 +345,13 @@ int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
 int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
                                  AVPacket *pkt, int flush);
 
+/**
+ * Return the frame duration in seconds. Return 0 if not available.
+ */
+void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st,
+                               AVCodecParserContext *pc, AVPacket *pkt);
+
+int ff_get_audio_frame_size(AVCodecContext *enc, int size, int mux);
+
+
 #endif /* AVFORMAT_INTERNAL_H */
diff --git a/libavformat/mux.c b/libavformat/mux.c
new file mode 100644
index 0000000000..ee5352c868
--- /dev/null
+++ b/libavformat/mux.c
@@ -0,0 +1,564 @@
+/*
+ * muxing functions for use within Libav
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
+ *
+ * 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
+ */
+
+/* #define DEBUG */
+
+#include "avformat.h"
+#include "avio_internal.h"
+#include "internal.h"
+#include "libavcodec/internal.h"
+#include "libavcodec/bytestream.h"
+#include "libavutil/opt.h"
+#include "libavutil/dict.h"
+#include "libavutil/pixdesc.h"
+#include "metadata.h"
+#include "id3v2.h"
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/time.h"
+#include "riff.h"
+#include "audiointerleave.h"
+#include "url.h"
+#include <stdarg.h>
+#if CONFIG_NETWORK
+#include "network.h"
+#endif
+
+#undef NDEBUG
+#include <assert.h>
+
+/**
+ * @file
+ * muxing functions for use within Libav
+ */
+
+/* fraction handling */
+
+/**
+ * f = val + (num / den) + 0.5.
+ *
+ * 'num' is normalized so that it is such as 0 <= num < den.
+ *
+ * @param f fractional number
+ * @param val integer value
+ * @param num must be >= 0
+ * @param den must be >= 1
+ */
+static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
+{
+    num += (den >> 1);
+    if (num >= den) {
+        val += num / den;
+        num  = num % den;
+    }
+    f->val = val;
+    f->num = num;
+    f->den = den;
+}
+
+/**
+ * Fractional addition to f: f = f + (incr / f->den).
+ *
+ * @param f fractional number
+ * @param incr increment, can be positive or negative
+ */
+static void frac_add(AVFrac *f, int64_t incr)
+{
+    int64_t num, den;
+
+    num = f->num + incr;
+    den = f->den;
+    if (num < 0) {
+        f->val += num / den;
+        num     = num % den;
+        if (num < 0) {
+            num += den;
+            f->val--;
+        }
+    } else if (num >= den) {
+        f->val += num / den;
+        num     = num % den;
+    }
+    f->num = num;
+}
+
+static int validate_codec_tag(AVFormatContext *s, AVStream *st)
+{
+    const AVCodecTag *avctag;
+    int n;
+    enum AVCodecID id = AV_CODEC_ID_NONE;
+    unsigned int tag  = 0;
+
+    /**
+     * Check that tag + id is in the table
+     * If neither is in the table -> OK
+     * If tag is in the table with another id -> FAIL
+     * If id is in the table with another tag -> FAIL unless strict < normal
+     */
+    for (n = 0; s->oformat->codec_tag[n]; n++) {
+        avctag = s->oformat->codec_tag[n];
+        while (avctag->id != AV_CODEC_ID_NONE) {
+            if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {
+                id = avctag->id;
+                if (id == st->codec->codec_id)
+                    return 1;
+            }
+            if (avctag->id == st->codec->codec_id)
+                tag = avctag->tag;
+            avctag++;
+        }
+    }
+    if (id != AV_CODEC_ID_NONE)
+        return 0;
+    if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
+        return 0;
+    return 1;
+}
+
+int avformat_write_header(AVFormatContext *s, AVDictionary **options)
+{
+    int ret = 0, i;
+    AVStream *st;
+    AVDictionary *tmp = NULL;
+
+    if (options)
+        av_dict_copy(&tmp, *options, 0);
+    if ((ret = av_opt_set_dict(s, &tmp)) < 0)
+        goto fail;
+
+    // some sanity checks
+    if (s->nb_streams == 0 && !(s->oformat->flags & AVFMT_NOSTREAMS)) {
+        av_log(s, AV_LOG_ERROR, "no streams\n");
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    for (i = 0; i < s->nb_streams; i++) {
+        st = s->streams[i];
+
+        switch (st->codec->codec_type) {
+        case AVMEDIA_TYPE_AUDIO:
+            if (st->codec->sample_rate <= 0) {
+                av_log(s, AV_LOG_ERROR, "sample rate not set\n");
+                ret = AVERROR(EINVAL);
+                goto fail;
+            }
+            if (!st->codec->block_align)
+                st->codec->block_align = st->codec->channels *
+                                         av_get_bits_per_sample(st->codec->codec_id) >> 3;
+            break;
+        case AVMEDIA_TYPE_VIDEO:
+            if (st->codec->time_base.num <= 0 || st->codec->time_base.den <= 0) { //FIXME audio too?
+                av_log(s, AV_LOG_ERROR, "time base not set\n");
+                ret = AVERROR(EINVAL);
+                goto fail;
+            }
+            if ((st->codec->width <= 0 || st->codec->height <= 0) && !(s->oformat->flags & AVFMT_NODIMENSIONS)) {
+                av_log(s, AV_LOG_ERROR, "dimensions not set\n");
+                ret = AVERROR(EINVAL);
+                goto fail;
+            }
+            if (av_cmp_q(st->sample_aspect_ratio, st->codec->sample_aspect_ratio)) {
+                av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
+                                        "(%d/%d) and encoder layer (%d/%d)\n",
+                       st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
+                       st->codec->sample_aspect_ratio.num,
+                       st->codec->sample_aspect_ratio.den);
+                ret = AVERROR(EINVAL);
+                goto fail;
+            }
+            break;
+        }
+
+        if (s->oformat->codec_tag) {
+            if (st->codec->codec_tag && st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && av_codec_get_tag(s->oformat->codec_tag, st->codec->codec_id) == 0 && !validate_codec_tag(s, st)) {
+                //the current rawvideo encoding system ends up setting the wrong codec_tag for avi, we override it here
+                st->codec->codec_tag = 0;
+            }
+            if (st->codec->codec_tag) {
+                if (!validate_codec_tag(s, st)) {
+                    char tagbuf[32];
+                    av_get_codec_tag_string(tagbuf, sizeof(tagbuf), st->codec->codec_tag);
+                    av_log(s, AV_LOG_ERROR,
+                           "Tag %s/0x%08x incompatible with output codec id '%d'\n",
+                           tagbuf, st->codec->codec_tag, st->codec->codec_id);
+                    ret = AVERROR_INVALIDDATA;
+                    goto fail;
+                }
+            } else
+                st->codec->codec_tag = av_codec_get_tag(s->oformat->codec_tag, st->codec->codec_id);
+        }
+
+        if (s->oformat->flags & AVFMT_GLOBALHEADER &&
+            !(st->codec->flags & CODEC_FLAG_GLOBAL_HEADER))
+            av_log(s, AV_LOG_WARNING, "Codec for stream %d does not use global headers but container format requires global headers\n", i);
+    }
+
+    if (!s->priv_data && s->oformat->priv_data_size > 0) {
+        s->priv_data = av_mallocz(s->oformat->priv_data_size);
+        if (!s->priv_data) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        if (s->oformat->priv_class) {
+            *(const AVClass **)s->priv_data = s->oformat->priv_class;
+            av_opt_set_defaults(s->priv_data);
+            if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
+                goto fail;
+        }
+    }
+
+    /* set muxer identification string */
+    if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
+        av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
+    }
+
+    if (s->oformat->write_header) {
+        ret = s->oformat->write_header(s);
+        if (ret < 0)
+            goto fail;
+    }
+
+    /* init PTS generation */
+    for (i = 0; i < s->nb_streams; i++) {
+        int64_t den = AV_NOPTS_VALUE;
+        st = s->streams[i];
+
+        switch (st->codec->codec_type) {
+        case AVMEDIA_TYPE_AUDIO:
+            den = (int64_t)st->time_base.num * st->codec->sample_rate;
+            break;
+        case AVMEDIA_TYPE_VIDEO:
+            den = (int64_t)st->time_base.num * st->codec->time_base.den;
+            break;
+        default:
+            break;
+        }
+        if (den != AV_NOPTS_VALUE) {
+            if (den <= 0) {
+                ret = AVERROR_INVALIDDATA;
+                goto fail;
+            }
+            frac_init(&st->pts, 0, 0, den);
+        }
+    }
+
+    if (options) {
+        av_dict_free(options);
+        *options = tmp;
+    }
+    return 0;
+fail:
+    av_dict_free(&tmp);
+    return ret;
+}
+
+//FIXME merge with compute_pkt_fields
+static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt)
+{
+    int delay = FFMAX(st->codec->has_b_frames, !!st->codec->max_b_frames);
+    int num, den, frame_size, i;
+
+    av_dlog(s, "compute_pkt_fields2: pts:%" PRId64 " dts:%" PRId64 " cur_dts:%" PRId64 " b:%d size:%d st:%d\n",
+            pkt->pts, pkt->dts, st->cur_dts, delay, pkt->size, pkt->stream_index);
+
+/*    if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
+ *      return AVERROR(EINVAL);*/
+
+    /* duration field */
+    if (pkt->duration == 0) {
+        ff_compute_frame_duration(&num, &den, st, NULL, pkt);
+        if (den && num) {
+            pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
+        }
+    }
+
+    if (pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay == 0)
+        pkt->pts = pkt->dts;
+
+    //XXX/FIXME this is a temporary hack until all encoders output pts
+    if ((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay) {
+        pkt->dts =
+//        pkt->pts= st->cur_dts;
+            pkt->pts = st->pts.val;
+    }
+
+    //calculate dts from pts
+    if (pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY) {
+        st->pts_buffer[0] = pkt->pts;
+        for (i = 1; i < delay + 1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
+            st->pts_buffer[i] = pkt->pts + (i - delay - 1) * pkt->duration;
+        for (i = 0; i<delay && st->pts_buffer[i] > st->pts_buffer[i + 1]; i++)
+            FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i + 1]);
+
+        pkt->dts = st->pts_buffer[0];
+    }
+
+    if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
+        ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
+          st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
+        av_log(s, AV_LOG_ERROR,
+               "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %" PRId64 " >= %" PRId64 "\n",
+               st->index, st->cur_dts, pkt->dts);
+        return AVERROR(EINVAL);
+    }
+    if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
+        av_log(s, AV_LOG_ERROR, "pts < dts in stream %d\n", st->index);
+        return AVERROR(EINVAL);
+    }
+
+    av_dlog(s, "av_write_frame: pts2:%"PRId64" dts2:%"PRId64"\n",
+            pkt->pts, pkt->dts);
+    st->cur_dts = pkt->dts;
+    st->pts.val = pkt->dts;
+
+    /* update pts */
+    switch (st->codec->codec_type) {
+    case AVMEDIA_TYPE_AUDIO:
+        frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 1);
+
+        /* HACK/FIXME, we skip the initial 0 size packets as they are most
+         * likely equal to the encoder delay, but it would be better if we
+         * had the real timestamps from the encoder */
+        if (frame_size >= 0 && (pkt->size || st->pts.num != st->pts.den >> 1 || st->pts.val)) {
+            frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
+        }
+        break;
+    case AVMEDIA_TYPE_VIDEO:
+        frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
+        break;
+    default:
+        break;
+    }
+    return 0;
+}
+
+int av_write_frame(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret;
+
+    if (!pkt) {
+        if (s->oformat->flags & AVFMT_ALLOW_FLUSH)
+            return s->oformat->write_packet(s, pkt);
+        return 1;
+    }
+
+    ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);
+
+    if (ret < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
+        return ret;
+
+    ret = s->oformat->write_packet(s, pkt);
+
+    if (ret >= 0)
+        s->streams[pkt->stream_index]->nb_frames++;
+    return ret;
+}
+
+void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
+                              int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))
+{
+    AVPacketList **next_point, *this_pktl;
+
+    this_pktl      = av_mallocz(sizeof(AVPacketList));
+    this_pktl->pkt = *pkt;
+    pkt->destruct  = NULL;           // do not free original but only the copy
+    av_dup_packet(&this_pktl->pkt);  // duplicate the packet if it uses non-alloced memory
+
+    if (s->streams[pkt->stream_index]->last_in_packet_buffer) {
+        next_point = &(s->streams[pkt->stream_index]->last_in_packet_buffer->next);
+    } else
+        next_point = &s->packet_buffer;
+
+    if (*next_point) {
+        if (compare(s, &s->packet_buffer_end->pkt, pkt)) {
+            while (!compare(s, &(*next_point)->pkt, pkt))
+                next_point = &(*next_point)->next;
+            goto next_non_null;
+        } else {
+            next_point = &(s->packet_buffer_end->next);
+        }
+    }
+    assert(!*next_point);
+
+    s->packet_buffer_end = this_pktl;
+next_non_null:
+
+    this_pktl->next = *next_point;
+
+    s->streams[pkt->stream_index]->last_in_packet_buffer =
+        *next_point                                      = this_pktl;
+}
+
+static int ff_interleave_compare_dts(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
+{
+    AVStream *st  = s->streams[pkt->stream_index];
+    AVStream *st2 = s->streams[next->stream_index];
+    int comp      = av_compare_ts(next->dts, st2->time_base, pkt->dts,
+                                  st->time_base);
+
+    if (comp == 0)
+        return pkt->stream_index < next->stream_index;
+    return comp > 0;
+}
+
+int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
+                                 AVPacket *pkt, int flush)
+{
+    AVPacketList *pktl;
+    int stream_count = 0;
+    int i;
+
+    if (pkt) {
+        ff_interleave_add_packet(s, pkt, ff_interleave_compare_dts);
+    }
+
+    for (i = 0; i < s->nb_streams; i++)
+        stream_count += !!s->streams[i]->last_in_packet_buffer;
+
+    if (stream_count && (s->nb_streams == stream_count || flush)) {
+        pktl = s->packet_buffer;
+        *out = pktl->pkt;
+
+        s->packet_buffer = pktl->next;
+        if (!s->packet_buffer)
+            s->packet_buffer_end = NULL;
+
+        if (s->streams[out->stream_index]->last_in_packet_buffer == pktl)
+            s->streams[out->stream_index]->last_in_packet_buffer = NULL;
+        av_freep(&pktl);
+        return 1;
+    } else {
+        av_init_packet(out);
+        return 0;
+    }
+}
+
+#if FF_API_INTERLEAVE_PACKET
+int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
+                                 AVPacket *pkt, int flush)
+{
+    return ff_interleave_packet_per_dts(s, out, pkt, flush);
+}
+
+#endif
+
+/**
+ * Interleave an AVPacket correctly so it can be muxed.
+ * @param out the interleaved packet will be output here
+ * @param in the input packet
+ * @param flush 1 if no further packets are available as input and all
+ *              remaining packets should be output
+ * @return 1 if a packet was output, 0 if no packet could be output,
+ *         < 0 if an error occurred
+ */
+static int interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)
+{
+    if (s->oformat->interleave_packet) {
+        int ret = s->oformat->interleave_packet(s, out, in, flush);
+        if (in)
+            av_free_packet(in);
+        return ret;
+    } else
+        return ff_interleave_packet_per_dts(s, out, in, flush);
+}
+
+int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, flush = 0;
+
+    if (pkt) {
+        AVStream *st = s->streams[pkt->stream_index];
+
+        //FIXME/XXX/HACK drop zero sized packets
+        if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size == 0)
+            return 0;
+
+        av_dlog(s, "av_interleaved_write_frame size:%d dts:%" PRId64 " pts:%" PRId64 "\n",
+                pkt->size, pkt->dts, pkt->pts);
+        if ((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
+            return ret;
+
+        if (pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
+            return AVERROR(EINVAL);
+    } else {
+        av_dlog(s, "av_interleaved_write_frame FLUSH\n");
+        flush = 1;
+    }
+
+    for (;; ) {
+        AVPacket opkt;
+        int ret = interleave_packet(s, &opkt, pkt, flush);
+        if (ret <= 0) //FIXME cleanup needed for ret<0 ?
+            return ret;
+
+        ret = s->oformat->write_packet(s, &opkt);
+        if (ret >= 0)
+            s->streams[opkt.stream_index]->nb_frames++;
+
+        av_free_packet(&opkt);
+        pkt = NULL;
+
+        if (ret < 0)
+            return ret;
+    }
+}
+
+int av_write_trailer(AVFormatContext *s)
+{
+    int ret, i;
+
+    for (;; ) {
+        AVPacket pkt;
+        ret = interleave_packet(s, &pkt, NULL, 1);
+        if (ret < 0) //FIXME cleanup needed for ret<0 ?
+            goto fail;
+        if (!ret)
+            break;
+
+        ret = s->oformat->write_packet(s, &pkt);
+        if (ret >= 0)
+            s->streams[pkt.stream_index]->nb_frames++;
+
+        av_free_packet(&pkt);
+
+        if (ret < 0)
+            goto fail;
+    }
+
+    if (s->oformat->write_trailer)
+        ret = s->oformat->write_trailer(s);
+
+    if (!(s->oformat->flags & AVFMT_NOFILE))
+        avio_flush(s->pb);
+
+fail:
+    for (i = 0; i < s->nb_streams; i++) {
+        av_freep(&s->streams[i]->priv_data);
+        av_freep(&s->streams[i]->index_entries);
+    }
+    if (s->oformat->priv_class)
+        av_opt_free(s->priv_data);
+    av_freep(&s->priv_data);
+    return ret;
+}
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 32cf58001f..b932322ed7 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -68,56 +68,6 @@ const char *avformat_license(void)
     return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
 }
 
-/* fraction handling */
-
-/**
- * f = val + (num / den) + 0.5.
- *
- * 'num' is normalized so that it is such as 0 <= num < den.
- *
- * @param f fractional number
- * @param val integer value
- * @param num must be >= 0
- * @param den must be >= 1
- */
-static void frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
-{
-    num += (den >> 1);
-    if (num >= den) {
-        val += num / den;
-        num = num % den;
-    }
-    f->val = val;
-    f->num = num;
-    f->den = den;
-}
-
-/**
- * Fractional addition to f: f = f + (incr / f->den).
- *
- * @param f fractional number
- * @param incr increment, can be positive or negative
- */
-static void frac_add(AVFrac *f, int64_t incr)
-{
-    int64_t num, den;
-
-    num = f->num + incr;
-    den = f->den;
-    if (num < 0) {
-        f->val += num / den;
-        num = num % den;
-        if (num < 0) {
-            num += den;
-            f->val--;
-        }
-    } else if (num >= den) {
-        f->val += num / den;
-        num = num % den;
-    }
-    f->num = num;
-}
-
 /** head of registered input format linked list */
 static AVInputFormat *first_iformat = NULL;
 /** head of registered output format linked list */
@@ -734,7 +684,7 @@ int av_read_packet(AVFormatContext *s, AVPacket *pkt)
 /**
  * Get the number of samples of an audio frame. Return -1 on error.
  */
-static int get_audio_frame_size(AVCodecContext *enc, int size, int mux)
+int ff_get_audio_frame_size(AVCodecContext *enc, int size, int mux)
 {
     int frame_size;
 
@@ -756,8 +706,8 @@ static int get_audio_frame_size(AVCodecContext *enc, int size, int mux)
 /**
  * Return the frame duration in seconds. Return 0 if not available.
  */
-static void compute_frame_duration(int *pnum, int *pden, AVStream *st,
-                                   AVCodecParserContext *pc, AVPacket *pkt)
+void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st,
+                               AVCodecParserContext *pc, AVPacket *pkt)
 {
     int frame_size;
 
@@ -785,7 +735,7 @@ static void compute_frame_duration(int *pnum, int *pden, AVStream *st,
         }
         break;
     case AVMEDIA_TYPE_AUDIO:
-        frame_size = get_audio_frame_size(st->codec, pkt->size, 0);
+        frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 0);
         if (frame_size <= 0 || st->codec->sample_rate <= 0)
             break;
         *pnum = frame_size;
@@ -909,7 +859,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
     }
 
     if (pkt->duration == 0 && st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
-        compute_frame_duration(&num, &den, st, pc, pkt);
+        ff_compute_frame_duration(&num, &den, st, pc, pkt);
         if (den && num) {
             pkt->duration = av_rescale_rnd(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num, AV_ROUND_DOWN);
 
@@ -984,7 +934,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
                    st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
             int duration = pkt->duration;
             if (!duration && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
-                compute_frame_duration(&num, &den, st, pc, pkt);
+                ff_compute_frame_duration(&num, &den, st, pc, pkt);
                 if (den && num) {
                     duration = av_rescale_rnd(1, num * (int64_t)st->time_base.den,
                                                  den * (int64_t)st->time_base.num,
@@ -2846,467 +2796,6 @@ AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
     return chapter;
 }
 
-/************************************************************/
-/* output media file */
-
-static int validate_codec_tag(AVFormatContext *s, AVStream *st)
-{
-    const AVCodecTag *avctag;
-    int n;
-    enum AVCodecID id = AV_CODEC_ID_NONE;
-    unsigned int tag = 0;
-
-    /**
-     * Check that tag + id is in the table
-     * If neither is in the table -> OK
-     * If tag is in the table with another id -> FAIL
-     * If id is in the table with another tag -> FAIL unless strict < normal
-     */
-    for (n = 0; s->oformat->codec_tag[n]; n++) {
-        avctag = s->oformat->codec_tag[n];
-        while (avctag->id != AV_CODEC_ID_NONE) {
-            if (avpriv_toupper4(avctag->tag) == avpriv_toupper4(st->codec->codec_tag)) {
-                id = avctag->id;
-                if (id == st->codec->codec_id)
-                    return 1;
-            }
-            if (avctag->id == st->codec->codec_id)
-                tag = avctag->tag;
-            avctag++;
-        }
-    }
-    if (id != AV_CODEC_ID_NONE)
-        return 0;
-    if (tag && (st->codec->strict_std_compliance >= FF_COMPLIANCE_NORMAL))
-        return 0;
-    return 1;
-}
-
-int avformat_write_header(AVFormatContext *s, AVDictionary **options)
-{
-    int ret = 0, i;
-    AVStream *st;
-    AVDictionary *tmp = NULL;
-
-    if (options)
-        av_dict_copy(&tmp, *options, 0);
-    if ((ret = av_opt_set_dict(s, &tmp)) < 0)
-        goto fail;
-
-    // some sanity checks
-    if (s->nb_streams == 0 && !(s->oformat->flags & AVFMT_NOSTREAMS)) {
-        av_log(s, AV_LOG_ERROR, "no streams\n");
-        ret = AVERROR(EINVAL);
-        goto fail;
-    }
-
-    for(i=0;i<s->nb_streams;i++) {
-        st = s->streams[i];
-
-        switch (st->codec->codec_type) {
-        case AVMEDIA_TYPE_AUDIO:
-            if(st->codec->sample_rate<=0){
-                av_log(s, AV_LOG_ERROR, "sample rate not set\n");
-                ret = AVERROR(EINVAL);
-                goto fail;
-            }
-            if(!st->codec->block_align)
-                st->codec->block_align = st->codec->channels *
-                    av_get_bits_per_sample(st->codec->codec_id) >> 3;
-            break;
-        case AVMEDIA_TYPE_VIDEO:
-            if(st->codec->time_base.num<=0 || st->codec->time_base.den<=0){ //FIXME audio too?
-                av_log(s, AV_LOG_ERROR, "time base not set\n");
-                ret = AVERROR(EINVAL);
-                goto fail;
-            }
-            if((st->codec->width<=0 || st->codec->height<=0) && !(s->oformat->flags & AVFMT_NODIMENSIONS)){
-                av_log(s, AV_LOG_ERROR, "dimensions not set\n");
-                ret = AVERROR(EINVAL);
-                goto fail;
-            }
-            if(av_cmp_q(st->sample_aspect_ratio, st->codec->sample_aspect_ratio)){
-                av_log(s, AV_LOG_ERROR, "Aspect ratio mismatch between muxer "
-                       "(%d/%d) and encoder layer (%d/%d)\n",
-                       st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
-                       st->codec->sample_aspect_ratio.num,
-                       st->codec->sample_aspect_ratio.den);
-                ret = AVERROR(EINVAL);
-                goto fail;
-            }
-            break;
-        }
-
-        if(s->oformat->codec_tag){
-            if(st->codec->codec_tag && st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && av_codec_get_tag(s->oformat->codec_tag, st->codec->codec_id) == 0 && !validate_codec_tag(s, st)){
-                //the current rawvideo encoding system ends up setting the wrong codec_tag for avi, we override it here
-                st->codec->codec_tag= 0;
-            }
-            if(st->codec->codec_tag){
-                if (!validate_codec_tag(s, st)) {
-                    char tagbuf[32];
-                    av_get_codec_tag_string(tagbuf, sizeof(tagbuf), st->codec->codec_tag);
-                    av_log(s, AV_LOG_ERROR,
-                           "Tag %s/0x%08x incompatible with output codec id '%d'\n",
-                           tagbuf, st->codec->codec_tag, st->codec->codec_id);
-                    ret = AVERROR_INVALIDDATA;
-                    goto fail;
-                }
-            }else
-                st->codec->codec_tag= av_codec_get_tag(s->oformat->codec_tag, st->codec->codec_id);
-        }
-
-        if(s->oformat->flags & AVFMT_GLOBALHEADER &&
-            !(st->codec->flags & CODEC_FLAG_GLOBAL_HEADER))
-          av_log(s, AV_LOG_WARNING, "Codec for stream %d does not use global headers but container format requires global headers\n", i);
-    }
-
-    if (!s->priv_data && s->oformat->priv_data_size > 0) {
-        s->priv_data = av_mallocz(s->oformat->priv_data_size);
-        if (!s->priv_data) {
-            ret = AVERROR(ENOMEM);
-            goto fail;
-        }
-        if (s->oformat->priv_class) {
-            *(const AVClass**)s->priv_data= s->oformat->priv_class;
-            av_opt_set_defaults(s->priv_data);
-            if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
-                goto fail;
-        }
-    }
-
-    /* set muxer identification string */
-    if (s->nb_streams && !(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
-        av_dict_set(&s->metadata, "encoder", LIBAVFORMAT_IDENT, 0);
-    }
-
-    if(s->oformat->write_header){
-        ret = s->oformat->write_header(s);
-        if (ret < 0)
-            goto fail;
-    }
-
-    /* init PTS generation */
-    for(i=0;i<s->nb_streams;i++) {
-        int64_t den = AV_NOPTS_VALUE;
-        st = s->streams[i];
-
-        switch (st->codec->codec_type) {
-        case AVMEDIA_TYPE_AUDIO:
-            den = (int64_t)st->time_base.num * st->codec->sample_rate;
-            break;
-        case AVMEDIA_TYPE_VIDEO:
-            den = (int64_t)st->time_base.num * st->codec->time_base.den;
-            break;
-        default:
-            break;
-        }
-        if (den != AV_NOPTS_VALUE) {
-            if (den <= 0) {
-                ret = AVERROR_INVALIDDATA;
-                goto fail;
-            }
-            frac_init(&st->pts, 0, 0, den);
-        }
-    }
-
-    if (options) {
-        av_dict_free(options);
-        *options = tmp;
-    }
-    return 0;
-fail:
-    av_dict_free(&tmp);
-    return ret;
-}
-
-//FIXME merge with compute_pkt_fields
-static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt){
-    int delay = FFMAX(st->codec->has_b_frames, !!st->codec->max_b_frames);
-    int num, den, frame_size, i;
-
-    av_dlog(s, "compute_pkt_fields2: pts:%"PRId64" dts:%"PRId64" cur_dts:%"PRId64" b:%d size:%d st:%d\n",
-            pkt->pts, pkt->dts, st->cur_dts, delay, pkt->size, pkt->stream_index);
-
-/*    if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
-        return AVERROR(EINVAL);*/
-
-    /* duration field */
-    if (pkt->duration == 0) {
-        compute_frame_duration(&num, &den, st, NULL, pkt);
-        if (den && num) {
-            pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den * st->codec->ticks_per_frame, den * (int64_t)st->time_base.num);
-        }
-    }
-
-    if(pkt->pts == AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE && delay==0)
-        pkt->pts= pkt->dts;
-
-    //XXX/FIXME this is a temporary hack until all encoders output pts
-    if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay){
-        pkt->dts=
-//        pkt->pts= st->cur_dts;
-        pkt->pts= st->pts.val;
-    }
-
-    //calculate dts from pts
-    if(pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY){
-        st->pts_buffer[0]= pkt->pts;
-        for(i=1; i<delay+1 && st->pts_buffer[i] == AV_NOPTS_VALUE; i++)
-            st->pts_buffer[i]= pkt->pts + (i-delay-1) * pkt->duration;
-        for(i=0; i<delay && st->pts_buffer[i] > st->pts_buffer[i+1]; i++)
-            FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i+1]);
-
-        pkt->dts= st->pts_buffer[0];
-    }
-
-    if (st->cur_dts && st->cur_dts != AV_NOPTS_VALUE &&
-        ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
-          st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
-        av_log(s, AV_LOG_ERROR,
-               "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %"PRId64" >= %"PRId64"\n",
-               st->index, st->cur_dts, pkt->dts);
-        return AVERROR(EINVAL);
-    }
-    if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts){
-        av_log(s, AV_LOG_ERROR, "pts < dts in stream %d\n", st->index);
-        return AVERROR(EINVAL);
-    }
-
-    av_dlog(s, "av_write_frame: pts2:%"PRId64" dts2:%"PRId64"\n",
-            pkt->pts, pkt->dts);
-    st->cur_dts= pkt->dts;
-    st->pts.val= pkt->dts;
-
-    /* update pts */
-    switch (st->codec->codec_type) {
-    case AVMEDIA_TYPE_AUDIO:
-        frame_size = get_audio_frame_size(st->codec, pkt->size, 1);
-
-        /* HACK/FIXME, we skip the initial 0 size packets as they are most
-           likely equal to the encoder delay, but it would be better if we
-           had the real timestamps from the encoder */
-        if (frame_size >= 0 && (pkt->size || st->pts.num!=st->pts.den>>1 || st->pts.val)) {
-            frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
-        }
-        break;
-    case AVMEDIA_TYPE_VIDEO:
-        frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
-        break;
-    default:
-        break;
-    }
-    return 0;
-}
-
-int av_write_frame(AVFormatContext *s, AVPacket *pkt)
-{
-    int ret;
-
-    if (!pkt) {
-        if (s->oformat->flags & AVFMT_ALLOW_FLUSH)
-            return s->oformat->write_packet(s, pkt);
-        return 1;
-    }
-
-    ret = compute_pkt_fields2(s, s->streams[pkt->stream_index], pkt);
-
-    if(ret<0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
-        return ret;
-
-    ret= s->oformat->write_packet(s, pkt);
-
-    if (ret >= 0)
-        s->streams[pkt->stream_index]->nb_frames++;
-    return ret;
-}
-
-void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
-                              int (*compare)(AVFormatContext *, AVPacket *, AVPacket *))
-{
-    AVPacketList **next_point, *this_pktl;
-
-    this_pktl = av_mallocz(sizeof(AVPacketList));
-    this_pktl->pkt= *pkt;
-    pkt->destruct= NULL;             // do not free original but only the copy
-    av_dup_packet(&this_pktl->pkt);  // duplicate the packet if it uses non-alloced memory
-
-    if(s->streams[pkt->stream_index]->last_in_packet_buffer){
-        next_point = &(s->streams[pkt->stream_index]->last_in_packet_buffer->next);
-    }else
-        next_point = &s->packet_buffer;
-
-    if(*next_point){
-        if(compare(s, &s->packet_buffer_end->pkt, pkt)){
-            while(!compare(s, &(*next_point)->pkt, pkt)){
-                next_point= &(*next_point)->next;
-            }
-            goto next_non_null;
-        }else{
-            next_point = &(s->packet_buffer_end->next);
-        }
-    }
-    assert(!*next_point);
-
-    s->packet_buffer_end= this_pktl;
-next_non_null:
-
-    this_pktl->next= *next_point;
-
-    s->streams[pkt->stream_index]->last_in_packet_buffer=
-    *next_point= this_pktl;
-}
-
-static int ff_interleave_compare_dts(AVFormatContext *s, AVPacket *next, AVPacket *pkt)
-{
-    AVStream *st = s->streams[ pkt ->stream_index];
-    AVStream *st2= s->streams[ next->stream_index];
-    int comp = av_compare_ts(next->dts, st2->time_base, pkt->dts,
-                             st->time_base);
-
-    if (comp == 0)
-        return pkt->stream_index < next->stream_index;
-    return comp > 0;
-}
-
-int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
-                                 AVPacket *pkt, int flush)
-{
-    AVPacketList *pktl;
-    int stream_count=0;
-    int i;
-
-    if(pkt){
-        ff_interleave_add_packet(s, pkt, ff_interleave_compare_dts);
-    }
-
-    for(i=0; i < s->nb_streams; i++)
-        stream_count+= !!s->streams[i]->last_in_packet_buffer;
-
-    if(stream_count && (s->nb_streams == stream_count || flush)){
-        pktl= s->packet_buffer;
-        *out= pktl->pkt;
-
-        s->packet_buffer= pktl->next;
-        if(!s->packet_buffer)
-            s->packet_buffer_end= NULL;
-
-        if(s->streams[out->stream_index]->last_in_packet_buffer == pktl)
-            s->streams[out->stream_index]->last_in_packet_buffer= NULL;
-        av_freep(&pktl);
-        return 1;
-    }else{
-        av_init_packet(out);
-        return 0;
-    }
-}
-
-#if FF_API_INTERLEAVE_PACKET
-int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
-                                 AVPacket *pkt, int flush)
-{
-    return ff_interleave_packet_per_dts(s, out, pkt, flush);
-}
-#endif
-
-/**
- * Interleave an AVPacket correctly so it can be muxed.
- * @param out the interleaved packet will be output here
- * @param in the input packet
- * @param flush 1 if no further packets are available as input and all
- *              remaining packets should be output
- * @return 1 if a packet was output, 0 if no packet could be output,
- *         < 0 if an error occurred
- */
-static int interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){
-    if (s->oformat->interleave_packet) {
-        int ret = s->oformat->interleave_packet(s, out, in, flush);
-        if (in)
-            av_free_packet(in);
-        return ret;
-    } else
-        return ff_interleave_packet_per_dts(s, out, in, flush);
-}
-
-int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
-    int ret, flush = 0;
-
-    if (pkt) {
-        AVStream *st= s->streams[ pkt->stream_index];
-
-        //FIXME/XXX/HACK drop zero sized packets
-        if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->size==0)
-            return 0;
-
-        av_dlog(s, "av_interleaved_write_frame size:%d dts:%"PRId64" pts:%"PRId64"\n",
-                pkt->size, pkt->dts, pkt->pts);
-        if((ret = compute_pkt_fields2(s, st, pkt)) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
-            return ret;
-
-        if(pkt->dts == AV_NOPTS_VALUE && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
-            return AVERROR(EINVAL);
-    } else {
-        av_dlog(s, "av_interleaved_write_frame FLUSH\n");
-        flush = 1;
-    }
-
-    for(;;){
-        AVPacket opkt;
-        int ret= interleave_packet(s, &opkt, pkt, flush);
-        if(ret<=0) //FIXME cleanup needed for ret<0 ?
-            return ret;
-
-        ret= s->oformat->write_packet(s, &opkt);
-        if (ret >= 0)
-            s->streams[opkt.stream_index]->nb_frames++;
-
-        av_free_packet(&opkt);
-        pkt= NULL;
-
-        if(ret<0)
-            return ret;
-    }
-}
-
-int av_write_trailer(AVFormatContext *s)
-{
-    int ret, i;
-
-    for (;;) {
-        AVPacket pkt;
-        ret = interleave_packet(s, &pkt, NULL, 1);
-        if (ret < 0) //FIXME cleanup needed for ret<0 ?
-            goto fail;
-        if (!ret)
-            break;
-
-        ret = s->oformat->write_packet(s, &pkt);
-        if (ret >= 0)
-            s->streams[pkt.stream_index]->nb_frames++;
-
-        av_free_packet(&pkt);
-
-        if (ret < 0)
-            goto fail;
-    }
-
-    if (s->oformat->write_trailer)
-        ret = s->oformat->write_trailer(s);
-
-    if (!(s->oformat->flags & AVFMT_NOFILE))
-        avio_flush(s->pb);
-
-fail:
-    for (i = 0; i < s->nb_streams; i++) {
-        av_freep(&s->streams[i]->priv_data);
-        av_freep(&s->streams[i]->index_entries);
-    }
-    if (s->oformat->priv_class)
-        av_opt_free(s->priv_data);
-    av_freep(&s->priv_data);
-    return ret;
-}
-
 void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx)
 {
     int i, j;