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ffmpeg/libavfilter/avfiltergraph.c

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/*
* filter graphs
* Copyright (c) 2008 Vitor Sessak
* Copyright (c) 2007 Bobby Bingham
*
* 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 <ctype.h>
#include <string.h>
#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#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 = {
.class_name = "AVFilterGraph",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
};
AVFilterGraph *avfilter_graph_alloc(void)
{
AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
if (!ret)
return NULL;
#if FF_API_GRAPH_AVCLASS
ret->av_class = &filtergraph_class;
#endif
return ret;
}
void avfilter_graph_free(AVFilterGraph **graph)
{
if (!*graph)
return;
for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
av_freep(&(*graph)->sink_links);
av_freep(&(*graph)->scale_sws_opts);
av_freep(&(*graph)->filters);
av_freep(graph);
}
int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
{
AVFilterContext **filters = av_realloc(graph->filters,
sizeof(AVFilterContext*) * (graph->filter_count+1));
if (!filters)
return AVERROR(ENOMEM);
graph->filters = filters;
graph->filters[graph->filter_count++] = filter;
return 0;
}
int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
const char *name, const char *args, void *opaque,
AVFilterGraph *graph_ctx)
{
int ret;
if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
goto fail;
if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
goto fail;
if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
goto fail;
return 0;
fail:
if (*filt_ctx)
avfilter_free(*filt_ctx);
*filt_ctx = NULL;
return ret;
}
void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
{
graph->disable_auto_convert = flags;
}
/**
* Check for the validity of graph.
*
* A graph is considered valid if all its input and output pads are
* connected.
*
* @return 0 in case of success, a negative value otherwise
*/
static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
{
AVFilterContext *filt;
int i, j;
for (i = 0; i < graph->filter_count; i++) {
filt = graph->filters[i];
for (j = 0; j < filt->input_count; j++) {
if (!filt->inputs[j] || !filt->inputs[j]->src) {
av_log(log_ctx, AV_LOG_ERROR,
"Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
filt->input_pads[j].name, filt->name, filt->filter->name);
return AVERROR(EINVAL);
}
}
for (j = 0; j < filt->output_count; j++) {
if (!filt->outputs[j] || !filt->outputs[j]->dst) {
av_log(log_ctx, AV_LOG_ERROR,
"Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
filt->output_pads[j].name, filt->name, filt->filter->name);
return AVERROR(EINVAL);
}
}
}
return 0;
}
/**
* Configure all the links of graphctx.
*
* @return 0 in case of success, a negative value otherwise
*/
static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
{
AVFilterContext *filt;
int i, ret;
for (i=0; i < graph->filter_count; i++) {
filt = graph->filters[i];
if (!filt->output_count) {
if ((ret = avfilter_config_links(filt)))
return ret;
}
}
return 0;
}
AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
{
int i;
for (i = 0; i < graph->filter_count; i++)
if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
return graph->filters[i];
return NULL;
}
static int filter_query_formats(AVFilterContext *ctx)
{
int ret;
AVFilterFormats *formats;
AVFilterChannelLayouts *chlayouts;
AVFilterFormats *samplerates;
enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
AVMEDIA_TYPE_VIDEO;
if ((ret = ctx->filter->query_formats(ctx)) < 0)
return ret;
formats = avfilter_make_all_formats(type);
if (!formats)
return AVERROR(ENOMEM);
avfilter_set_common_formats(ctx, formats);
if (type == AVMEDIA_TYPE_AUDIO) {
samplerates = ff_all_samplerates();
if (!samplerates)
return AVERROR(ENOMEM);
ff_set_common_samplerates(ctx, samplerates);
chlayouts = ff_all_channel_layouts();
if (!chlayouts)
return AVERROR(ENOMEM);
ff_set_common_channel_layouts(ctx, chlayouts);
}
return 0;
}
static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
const char *filt_name, const char *filt_args)
{
static int auto_count = 0, ret;
char inst_name[32];
AVFilterContext *filt_ctx;
if (graph->disable_auto_convert) {
av_log(NULL, AV_LOG_ERROR,
"The filters '%s' and '%s' do not have a common format "
"and automatic conversion is disabled.\n",
link->src->name, link->dst->name);
return AVERROR(EINVAL);
}
snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
filt_name, auto_count++);
if ((ret = avfilter_graph_create_filter(&filt_ctx,
avfilter_get_by_name(filt_name),
inst_name, filt_args, NULL, graph)) < 0)
return ret;
if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
return ret;
filter_query_formats(filt_ctx);
if ( ((link = filt_ctx-> inputs[0]) &&
!avfilter_merge_formats(link->in_formats, link->out_formats)) ||
((link = filt_ctx->outputs[0]) &&
!avfilter_merge_formats(link->in_formats, link->out_formats))
) {
av_log(NULL, 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 AVERROR(EINVAL);
}
if (link->type == AVMEDIA_TYPE_AUDIO &&
(((link = filt_ctx-> inputs[0]) &&
!ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
((link = filt_ctx->outputs[0]) &&
!ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
) {
av_log(NULL, AV_LOG_ERROR,
"Impossible to convert between the channel layouts formats supported by the filter "
"'%s' and the filter '%s'\n", link->src->name, link->dst->name);
return AVERROR(EINVAL);
}
return 0;
}
static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
{
int i, j, ret;
char filt_args[128];
AVFilterFormats *formats;
AVFilterChannelLayouts *chlayouts;
AVFilterFormats *samplerates;
int scaler_count = 0, resampler_count = 0;
for (j = 0; j < 2; j++) {
/* ask all the sub-filters for their supported media formats */
for (i = 0; i < graph->filter_count; i++) {
/* Call query_formats on sources first.
This is a temporary workaround for amerge,
until format renegociation is implemented. */
if (!graph->filters[i]->input_count == j)
continue;
if (graph->filters[i]->filter->query_formats)
ret = filter_query_formats(graph->filters[i]);
else
ret = ff_default_query_formats(graph->filters[i]);
if (ret < 0)
return ret;
}
}
/* go through and merge as many format lists as possible */
for (i = 0; i < graph->filter_count; i++) {
AVFilterContext *filter = graph->filters[i];
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)
return AVERROR(EINVAL);
if (link->type == AVMEDIA_TYPE_VIDEO &&
!avfilter_merge_formats(link->in_formats, link->out_formats)) {
/* couldn't merge format lists, auto-insert scale filter */
snprintf(filt_args, sizeof(filt_args), "0:0:%s",
graph->scale_sws_opts);
if (ret = insert_conv_filter(graph, link, "scale", filt_args))
return ret;
}
else if (link->type == AVMEDIA_TYPE_AUDIO) {
if (!link->in_channel_layouts || !link->out_channel_layouts)
return AVERROR(EINVAL);
/* Merge all three list before checking: that way, in all
* three categories, aconvert will use a common format
* whenever possible. */
formats = avfilter_merge_formats(link->in_formats, link->out_formats);
chlayouts = ff_merge_channel_layouts(link->in_channel_layouts , link->out_channel_layouts);
samplerates = ff_merge_samplerates (link->in_samplerates, link->out_samplerates);
if (!formats || !chlayouts || !samplerates)
if (ret = insert_conv_filter(graph, link, "aresample", NULL))
return ret;
#else
int convert_needed = 0;
if (!link)
continue;
if (link->in_formats != link->out_formats &&
!ff_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("aresample"))) {
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("aresample"),
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;
filter_query_formats(convert);
inlink = convert->inputs[0];
outlink = convert->outputs[0];
if (!ff_merge_formats( inlink->in_formats, inlink->out_formats) ||
!ff_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
}
}
}
return 0;
}
static int pick_format(AVFilterLink *link, AVFilterLink *ref)
{
if (!link || !link->in_formats)
return 0;
if (link->type == AVMEDIA_TYPE_VIDEO) {
if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
enum PixelFormat best= PIX_FMT_NONE;
int i;
for (i=0; i<link->in_formats->format_count; i++) {
enum PixelFormat p = link->in_formats->formats[i];
best= avcodec_find_best_pix_fmt2(best, p, ref->format, has_alpha, NULL);
}
link->in_formats->formats[0] = best;
}
}
link->in_formats->format_count = 1;
link->format = link->in_formats->formats[0];
if (link->type == AVMEDIA_TYPE_AUDIO) {
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];
}
ff_formats_unref(&link->in_formats);
ff_formats_unref(&link->out_formats);
ff_formats_unref(&link->in_samplerates);
ff_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;
REDUCE_FORMATS(int, AVFilterFormats, formats, formats,
format_count, ff_add_format);
REDUCE_FORMATS(int, AVFilterFormats, samplerates, formats,
format_count, ff_add_format);
REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
channel_layouts, nb_channel_layouts, ff_add_channel_layout);
return ret;
}
static void reduce_formats(AVFilterGraph *graph)
{
int i, reduced;
do {
reduced = 0;
for (i = 0; i < graph->filter_count; i++)
reduced |= reduce_formats_on_filter(graph->filters[i]);
} while (reduced);
}
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 void swap_sample_fmts_on_filter(AVFilterContext *filter)
{
AVFilterLink *link = NULL;
int format, bps;
int i, j;
for (i = 0; i < filter->input_count; i++) {
link = filter->inputs[i];
if (link->type == AVMEDIA_TYPE_AUDIO &&
link->out_formats->format_count == 1)
break;
}
if (i == filter->input_count)
return;
format = link->out_formats->formats[0];
bps = av_get_bytes_per_sample(format);
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_formats->format_count < 2)
continue;
for (j = 0; j < outlink->in_formats->format_count; j++) {
int out_format = outlink->in_formats->formats[j];
int out_bps = av_get_bytes_per_sample(out_format);
int score;
if (av_get_packed_sample_fmt(out_format) == format ||
av_get_planar_sample_fmt(out_format) == format) {
best_idx = j;
break;
}
/* for s32 and float prefer double to prevent loss of information */
if (bps == 4 && out_bps == 8) {
best_idx = j;
break;
}
/* prefer closest higher or equal bps */
score = -abs(out_bps - bps);
if (out_bps >= bps)
score += INT_MAX/2;
if (score > best_score) {
best_score = score;
best_idx = j;
}
}
FFSWAP(int, outlink->in_formats->formats[0],
outlink->in_formats->formats[best_idx]);
}
}
static void swap_sample_fmts(AVFilterGraph *graph)
{
int i;
for (i = 0; i < graph->filter_count; i++)
swap_sample_fmts_on_filter(graph->filters[i]);
}
static int pick_formats(AVFilterGraph *graph)
{
int i, j, ret;
int change;
do{
change = 0;
for (i = 0; i < graph->filter_count; i++) {
AVFilterContext *filter = graph->filters[i];
if (filter->input_count){
for (j = 0; j < filter->input_count; j++){
if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
pick_format(filter->inputs[j], NULL);
change = 1;
}
}
}
if (filter->output_count){
for (j = 0; j < filter->output_count; j++){
if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
pick_format(filter->outputs[j], NULL);
change = 1;
}
}
}
if (filter->input_count && filter->output_count && filter->inputs[0]->format>=0) {
for (j = 0; j < filter->output_count; j++) {
if(filter->outputs[j]->format<0) {
pick_format(filter->outputs[j], filter->inputs[0]);
change = 1;
}
}
}
}
}while(change);
for (i = 0; i < graph->filter_count; i++) {
AVFilterContext *filter = graph->filters[i];
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;
}
/**
* Configure the formats of all the links in the graph.
*/
static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
{
int ret;
/* find supported formats from sub-filters, and merge along links */
if ((ret = query_formats(graph, log_ctx)) < 0)
return ret;
/* Once everything is merged, it's possible that we'll still have
* multiple valid media format choices. We try to minimize the amount
* of format conversion inside filters */
reduce_formats(graph);
/* for audio filters, ensure the best format, sample rate and channel layout
* is selected */
swap_sample_fmts(graph);
swap_samplerates(graph);
swap_channel_layouts(graph);
if ((ret = pick_formats(graph)) < 0)
return ret;
return 0;
}
static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
AVClass *log_ctx)
{
unsigned i, j;
int sink_links_count = 0, n = 0;
AVFilterContext *f;
AVFilterLink **sinks;
for (i = 0; i < graph->filter_count; i++) {
f = graph->filters[i];
for (j = 0; j < f->input_count; j++) {
f->inputs[j]->graph = graph;
f->inputs[j]->age_index = -1;
}
for (j = 0; j < f->output_count; j++) {
f->outputs[j]->graph = graph;
f->outputs[j]->age_index= -1;
}
if (!f->output_count) {
if (f->input_count > INT_MAX - sink_links_count)
return AVERROR(EINVAL);
sink_links_count += f->input_count;
}
}
sinks = av_calloc(sink_links_count, sizeof(*sinks));
if (!sinks)
return AVERROR(ENOMEM);
for (i = 0; i < graph->filter_count; i++) {
f = graph->filters[i];
if (!f->output_count) {
for (j = 0; j < f->input_count; j++) {
sinks[n] = f->inputs[j];
f->inputs[j]->age_index = n++;
}
}
}
av_assert0(n == sink_links_count);
graph->sink_links = sinks;
graph->sink_links_count = sink_links_count;
return 0;
}
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
{
int ret;
if ((ret = graph_check_validity(graphctx, log_ctx)))
return ret;
if ((ret = graph_config_formats(graphctx, log_ctx)))
return ret;
if ((ret = graph_config_links(graphctx, log_ctx)))
return ret;
if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
return ret;
return 0;
}
int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
{
int i, r = AVERROR(ENOSYS);
if(!graph)
return r;
if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
if(r != AVERROR(ENOSYS))
return r;
}
if(res_len && res)
res[0]= 0;
for (i = 0; i < graph->filter_count; i++) {
AVFilterContext *filter = graph->filters[i];
if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
if(r != AVERROR(ENOSYS)) {
if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
return r;
}
}
}
return r;
}
int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
{
int i;
if(!graph)
return 0;
for (i = 0; i < graph->filter_count; i++) {
AVFilterContext *filter = graph->filters[i];
if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
AVFilterCommand **que = &filter->command_queue, *next;
while(*que && (*que)->time <= ts)
que = &(*que)->next;
next= *que;
*que= av_mallocz(sizeof(AVFilterCommand));
(*que)->command = av_strdup(command);
(*que)->arg = av_strdup(arg);
(*que)->time = ts;
(*que)->flags = flags;
(*que)->next = next;
if(flags & AVFILTER_CMD_FLAG_ONE)
return 0;
}
}
return 0;
}
static void heap_bubble_up(AVFilterGraph *graph,
AVFilterLink *link, int index)
{
AVFilterLink **links = graph->sink_links;
while (index) {
int parent = (index - 1) >> 1;
if (links[parent]->current_pts >= link->current_pts)
break;
links[index] = links[parent];
links[index]->age_index = index;
index = parent;
}
links[index] = link;
link->age_index = index;
}
static void heap_bubble_down(AVFilterGraph *graph,
AVFilterLink *link, int index)
{
AVFilterLink **links = graph->sink_links;
while (1) {
int child = 2 * index + 1;
if (child >= graph->sink_links_count)
break;
if (child + 1 < graph->sink_links_count &&
links[child + 1]->current_pts < links[child]->current_pts)
child++;
if (link->current_pts < links[child]->current_pts)
break;
links[index] = links[child];
links[index]->age_index = index;
index = child;
}
links[index] = link;
link->age_index = index;
}
void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
{
heap_bubble_up (graph, link, link->age_index);
heap_bubble_down(graph, link, link->age_index);
}
int avfilter_graph_request_oldest(AVFilterGraph *graph)
{
while (graph->sink_links_count) {
AVFilterLink *oldest = graph->sink_links[0];
int r = avfilter_request_frame(oldest);
if (r != AVERROR_EOF)
return r;
/* EOF: remove the link from the heap */
if (oldest->age_index < --graph->sink_links_count)
heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
oldest->age_index);
oldest->age_index = -1;
}
return AVERROR_EOF;
}
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