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-rw-r--r--libavfilter/f_select.c532
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diff --git a/libavfilter/f_select.c b/libavfilter/f_select.c
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+++ b/libavfilter/f_select.c
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+/*
+ * Copyright (c) 2011 Stefano Sabatini
+ *
+ * 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
+ * filter for selecting which frame passes in the filterchain
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/fifo.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixelutils.h"
+#include "avfilter.h"
+#include "audio.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+static const char *const var_names[] = {
+ "TB", ///< timebase
+
+ "pts", ///< original pts in the file of the frame
+ "start_pts", ///< first PTS in the stream, expressed in TB units
+ "prev_pts", ///< previous frame PTS
+ "prev_selected_pts", ///< previous selected frame PTS
+
+ "t", ///< timestamp expressed in seconds
+ "start_t", ///< first PTS in the stream, expressed in seconds
+ "prev_t", ///< previous frame time
+ "prev_selected_t", ///< previously selected time
+
+ "pict_type", ///< the type of picture in the movie
+ "I",
+ "P",
+ "B",
+ "S",
+ "SI",
+ "SP",
+ "BI",
+ "PICT_TYPE_I",
+ "PICT_TYPE_P",
+ "PICT_TYPE_B",
+ "PICT_TYPE_S",
+ "PICT_TYPE_SI",
+ "PICT_TYPE_SP",
+ "PICT_TYPE_BI",
+
+ "interlace_type", ///< the frame interlace type
+ "PROGRESSIVE",
+ "TOPFIRST",
+ "BOTTOMFIRST",
+
+ "consumed_samples_n",///< number of samples consumed by the filter (only audio)
+ "samples_n", ///< number of samples in the current frame (only audio)
+ "sample_rate", ///< sample rate (only audio)
+
+ "n", ///< frame number (starting from zero)
+ "selected_n", ///< selected frame number (starting from zero)
+ "prev_selected_n", ///< number of the last selected frame
+
+ "key", ///< tell if the frame is a key frame
+ "pos", ///< original position in the file of the frame
+
+ "scene",
+
+ "concatdec_select", ///< frame is within the interval set by the concat demuxer
+
+ NULL
+};
+
+enum var_name {
+ VAR_TB,
+
+ VAR_PTS,
+ VAR_START_PTS,
+ VAR_PREV_PTS,
+ VAR_PREV_SELECTED_PTS,
+
+ VAR_T,
+ VAR_START_T,
+ VAR_PREV_T,
+ VAR_PREV_SELECTED_T,
+
+ VAR_PICT_TYPE,
+ VAR_I,
+ VAR_P,
+ VAR_B,
+ VAR_S,
+ VAR_SI,
+ VAR_SP,
+ VAR_BI,
+ VAR_PICT_TYPE_I,
+ VAR_PICT_TYPE_P,
+ VAR_PICT_TYPE_B,
+ VAR_PICT_TYPE_S,
+ VAR_PICT_TYPE_SI,
+ VAR_PICT_TYPE_SP,
+ VAR_PICT_TYPE_BI,
+
+ VAR_INTERLACE_TYPE,
+ VAR_INTERLACE_TYPE_P,
+ VAR_INTERLACE_TYPE_T,
+ VAR_INTERLACE_TYPE_B,
+
+ VAR_CONSUMED_SAMPLES_N,
+ VAR_SAMPLES_N,
+ VAR_SAMPLE_RATE,
+
+ VAR_N,
+ VAR_SELECTED_N,
+ VAR_PREV_SELECTED_N,
+
+ VAR_KEY,
+ VAR_POS,
+
+ VAR_SCENE,
+
+ VAR_CONCATDEC_SELECT,
+
+ VAR_VARS_NB
+};
+
+typedef struct SelectContext {
+ const AVClass *class;
+ char *expr_str;
+ AVExpr *expr;
+ double var_values[VAR_VARS_NB];
+ int do_scene_detect; ///< 1 if the expression requires scene detection variables, 0 otherwise
+ av_pixelutils_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
+ double prev_mafd; ///< previous MAFD (scene detect only)
+ AVFrame *prev_picref; ///< previous frame (scene detect only)
+ double select;
+ int select_out; ///< mark the selected output pad index
+ int nb_outputs;
+} SelectContext;
+
+#define OFFSET(x) offsetof(SelectContext, x)
+#define DEFINE_OPTIONS(filt_name, FLAGS) \
+static const AVOption filt_name##_options[] = { \
+ { "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
+ { "e", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
+ { "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
+ { "n", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
+ { NULL } \
+}
+
+static int request_frame(AVFilterLink *outlink);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ SelectContext *select = ctx->priv;
+ int i, ret;
+
+ if ((ret = av_expr_parse(&select->expr, select->expr_str,
+ var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",
+ select->expr_str);
+ return ret;
+ }
+ select->do_scene_detect = !!strstr(select->expr_str, "scene");
+
+ for (i = 0; i < select->nb_outputs; i++) {
+ AVFilterPad pad = { 0 };
+
+ pad.name = av_asprintf("output%d", i);
+ if (!pad.name)
+ return AVERROR(ENOMEM);
+ pad.type = ctx->filter->inputs[0].type;
+ pad.request_frame = request_frame;
+ ff_insert_outpad(ctx, i, &pad);
+ }
+
+ return 0;
+}
+
+#define INTERLACE_TYPE_P 0
+#define INTERLACE_TYPE_T 1
+#define INTERLACE_TYPE_B 2
+
+static int config_input(AVFilterLink *inlink)
+{
+ SelectContext *select = inlink->dst->priv;
+
+ select->var_values[VAR_N] = 0.0;
+ select->var_values[VAR_SELECTED_N] = 0.0;
+
+ select->var_values[VAR_TB] = av_q2d(inlink->time_base);
+
+ select->var_values[VAR_PREV_PTS] = NAN;
+ select->var_values[VAR_PREV_SELECTED_PTS] = NAN;
+ select->var_values[VAR_PREV_SELECTED_T] = NAN;
+ select->var_values[VAR_PREV_T] = NAN;
+ select->var_values[VAR_START_PTS] = NAN;
+ select->var_values[VAR_START_T] = NAN;
+
+ select->var_values[VAR_I] = AV_PICTURE_TYPE_I;
+ select->var_values[VAR_P] = AV_PICTURE_TYPE_P;
+ select->var_values[VAR_B] = AV_PICTURE_TYPE_B;
+ select->var_values[VAR_SI] = AV_PICTURE_TYPE_SI;
+ select->var_values[VAR_SP] = AV_PICTURE_TYPE_SP;
+ select->var_values[VAR_BI] = AV_PICTURE_TYPE_BI;
+ select->var_values[VAR_PICT_TYPE_I] = AV_PICTURE_TYPE_I;
+ select->var_values[VAR_PICT_TYPE_P] = AV_PICTURE_TYPE_P;
+ select->var_values[VAR_PICT_TYPE_B] = AV_PICTURE_TYPE_B;
+ select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI;
+ select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP;
+ select->var_values[VAR_PICT_TYPE_BI] = AV_PICTURE_TYPE_BI;
+
+ select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P;
+ select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
+ select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;
+
+ select->var_values[VAR_PICT_TYPE] = NAN;
+ select->var_values[VAR_INTERLACE_TYPE] = NAN;
+ select->var_values[VAR_SCENE] = NAN;
+ select->var_values[VAR_CONSUMED_SAMPLES_N] = NAN;
+ select->var_values[VAR_SAMPLES_N] = NAN;
+
+ select->var_values[VAR_SAMPLE_RATE] =
+ inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
+
+ if (select->do_scene_detect) {
+ select->sad = av_pixelutils_get_sad_fn(3, 3, 2, select); // 8x8 both sources aligned
+ if (!select->sad)
+ return AVERROR(EINVAL);
+ }
+ return 0;
+}
+
+static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
+{
+ double ret = 0;
+ SelectContext *select = ctx->priv;
+ AVFrame *prev_picref = select->prev_picref;
+
+ if (prev_picref &&
+ frame->height == prev_picref->height &&
+ frame->width == prev_picref->width) {
+ int x, y, nb_sad = 0;
+ int64_t sad = 0;
+ double mafd, diff;
+ uint8_t *p1 = frame->data[0];
+ uint8_t *p2 = prev_picref->data[0];
+ const int p1_linesize = frame->linesize[0];
+ const int p2_linesize = prev_picref->linesize[0];
+
+ for (y = 0; y < frame->height - 7; y += 8) {
+ for (x = 0; x < frame->width*3 - 7; x += 8) {
+ sad += select->sad(p1 + x, p1_linesize, p2 + x, p2_linesize);
+ nb_sad += 8 * 8;
+ }
+ p1 += 8 * p1_linesize;
+ p2 += 8 * p2_linesize;
+ }
+ emms_c();
+ mafd = nb_sad ? (double)sad / nb_sad : 0;
+ diff = fabs(mafd - select->prev_mafd);
+ ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
+ select->prev_mafd = mafd;
+ av_frame_free(&prev_picref);
+ }
+ select->prev_picref = av_frame_clone(frame);
+ return ret;
+}
+
+static double get_concatdec_select(AVFrame *frame, int64_t pts)
+{
+ AVDictionary *metadata = av_frame_get_metadata(frame);
+ AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);
+ AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);
+ if (start_time_entry) {
+ int64_t start_time = strtoll(start_time_entry->value, NULL, 10);
+ if (pts >= start_time) {
+ if (duration_entry) {
+ int64_t duration = strtoll(duration_entry->value, NULL, 10);
+ if (pts < start_time + duration)
+ return -1;
+ else
+ return 0;
+ }
+ return -1;
+ }
+ return 0;
+ }
+ return NAN;
+}
+
+#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
+#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
+
+static void select_frame(AVFilterContext *ctx, AVFrame *frame)
+{
+ SelectContext *select = ctx->priv;
+ AVFilterLink *inlink = ctx->inputs[0];
+ double res;
+
+ if (isnan(select->var_values[VAR_START_PTS]))
+ select->var_values[VAR_START_PTS] = TS2D(frame->pts);
+ if (isnan(select->var_values[VAR_START_T]))
+ select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
+
+ select->var_values[VAR_N ] = inlink->frame_count_out;
+ select->var_values[VAR_PTS] = TS2D(frame->pts);
+ select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
+ select->var_values[VAR_POS] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
+ select->var_values[VAR_KEY] = frame->key_frame;
+ select->var_values[VAR_CONCATDEC_SELECT] = get_concatdec_select(frame, av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q));
+
+ switch (inlink->type) {
+ case AVMEDIA_TYPE_AUDIO:
+ select->var_values[VAR_SAMPLES_N] = frame->nb_samples;
+ break;
+
+ case AVMEDIA_TYPE_VIDEO:
+ select->var_values[VAR_INTERLACE_TYPE] =
+ !frame->interlaced_frame ? INTERLACE_TYPE_P :
+ frame->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
+ select->var_values[VAR_PICT_TYPE] = frame->pict_type;
+ if (select->do_scene_detect) {
+ char buf[32];
+ select->var_values[VAR_SCENE] = get_scene_score(ctx, frame);
+ // TODO: document metadata
+ snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
+ av_dict_set(avpriv_frame_get_metadatap(frame), "lavfi.scene_score", buf, 0);
+ }
+ break;
+ }
+
+ select->select = res = av_expr_eval(select->expr, select->var_values, NULL);
+ av_log(inlink->dst, AV_LOG_DEBUG,
+ "n:%f pts:%f t:%f key:%d",
+ select->var_values[VAR_N],
+ select->var_values[VAR_PTS],
+ select->var_values[VAR_T],
+ frame->key_frame);
+
+ switch (inlink->type) {
+ case AVMEDIA_TYPE_VIDEO:
+ av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",
+ (!frame->interlaced_frame) ? 'P' :
+ frame->top_field_first ? 'T' : 'B',
+ av_get_picture_type_char(frame->pict_type),
+ select->var_values[VAR_SCENE]);
+ break;
+ case AVMEDIA_TYPE_AUDIO:
+ av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",
+ frame->nb_samples,
+ select->var_values[VAR_CONSUMED_SAMPLES_N]);
+ break;
+ }
+
+ if (res == 0) {
+ select->select_out = -1; /* drop */
+ } else if (isnan(res) || res < 0) {
+ select->select_out = 0; /* first output */
+ } else {
+ select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */
+ }
+
+ av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);
+
+ if (res) {
+ select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
+ select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];
+ select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
+ select->var_values[VAR_SELECTED_N] += 1.0;
+ if (inlink->type == AVMEDIA_TYPE_AUDIO)
+ select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;
+ }
+
+ select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];
+ select->var_values[VAR_PREV_T] = select->var_values[VAR_T];
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ SelectContext *select = ctx->priv;
+
+ select_frame(ctx, frame);
+ if (select->select)
+ return ff_filter_frame(ctx->outputs[select->select_out], frame);
+
+ av_frame_free(&frame);
+ return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterLink *inlink = outlink->src->inputs[0];
+ int ret = ff_request_frame(inlink);
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SelectContext *select = ctx->priv;
+ int i;
+
+ av_expr_free(select->expr);
+ select->expr = NULL;
+
+ for (i = 0; i < ctx->nb_outputs; i++)
+ av_freep(&ctx->output_pads[i].name);
+
+ if (select->do_scene_detect) {
+ av_frame_free(&select->prev_picref);
+ }
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ SelectContext *select = ctx->priv;
+
+ if (!select->do_scene_detect) {
+ return ff_default_query_formats(ctx);
+ } else {
+ int ret;
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
+ AV_PIX_FMT_NONE
+ };
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ ret = ff_set_common_formats(ctx, fmts_list);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+#if CONFIG_ASELECT_FILTER
+
+DEFINE_OPTIONS(aselect, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(aselect);
+
+static av_cold int aselect_init(AVFilterContext *ctx)
+{
+ SelectContext *select = ctx->priv;
+ int ret;
+
+ if ((ret = init(ctx)) < 0)
+ return ret;
+
+ if (select->do_scene_detect) {
+ av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+static const AVFilterPad avfilter_af_aselect_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_af_aselect = {
+ .name = "aselect",
+ .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
+ .init = aselect_init,
+ .uninit = uninit,
+ .priv_size = sizeof(SelectContext),
+ .inputs = avfilter_af_aselect_inputs,
+ .priv_class = &aselect_class,
+ .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
+};
+#endif /* CONFIG_ASELECT_FILTER */
+
+#if CONFIG_SELECT_FILTER
+
+DEFINE_OPTIONS(select, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(select);
+
+static av_cold int select_init(AVFilterContext *ctx)
+{
+ int ret;
+
+ if ((ret = init(ctx)) < 0)
+ return ret;
+
+ return 0;
+}
+
+static const AVFilterPad avfilter_vf_select_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_select = {
+ .name = "select",
+ .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
+ .init = select_init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .priv_size = sizeof(SelectContext),
+ .priv_class = &select_class,
+ .inputs = avfilter_vf_select_inputs,
+ .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
+};
+#endif /* CONFIG_SELECT_FILTER */
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