252 lines
8.0 KiB
C
252 lines
8.0 KiB
C
/*
|
|
* 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 "avfilter.h"
|
|
#include "avfiltergraph.h"
|
|
#include "internal.h"
|
|
|
|
AVFilterGraph *avfilter_graph_alloc(void)
|
|
{
|
|
return av_mallocz(sizeof(AVFilterGraph));
|
|
}
|
|
|
|
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)->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;
|
|
}
|
|
|
|
int ff_avfilter_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;
|
|
}
|
|
|
|
int ff_avfilter_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 query_formats(AVFilterGraph *graph, AVClass *log_ctx)
|
|
{
|
|
int i, j, ret;
|
|
int scaler_count = 0;
|
|
char inst_name[30];
|
|
|
|
/* ask all the sub-filters for their supported media formats */
|
|
for (i = 0; i < graph->filter_count; i++) {
|
|
if (graph->filters[i]->filter->query_formats)
|
|
graph->filters[i]->filter->query_formats(graph->filters[i]);
|
|
else
|
|
avfilter_default_query_formats(graph->filters[i]);
|
|
}
|
|
|
|
/* 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 (link && link->in_formats != link->out_formats) {
|
|
if (!avfilter_merge_formats(link->in_formats,
|
|
link->out_formats)) {
|
|
AVFilterContext *scale;
|
|
char scale_args[256];
|
|
/* couldn't merge format lists. auto-insert scale filter */
|
|
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(&scale, avfilter_get_by_name("scale"),
|
|
inst_name, scale_args, NULL, graph)) < 0)
|
|
return ret;
|
|
if ((ret = avfilter_insert_filter(link, scale, 0, 0)) < 0)
|
|
return ret;
|
|
|
|
scale->filter->query_formats(scale);
|
|
if (((link = scale-> inputs[0]) &&
|
|
!avfilter_merge_formats(link->in_formats, link->out_formats)) ||
|
|
((link = scale->outputs[0]) &&
|
|
!avfilter_merge_formats(link->in_formats, link->out_formats))) {
|
|
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 AVERROR(EINVAL);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pick_format(AVFilterLink *link)
|
|
{
|
|
if (!link || !link->in_formats)
|
|
return;
|
|
|
|
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);
|
|
}
|
|
|
|
}
|
|
|
|
static void pick_formats(AVFilterGraph *graph)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < graph->filter_count; i++) {
|
|
AVFilterContext *filter = graph->filters[i];
|
|
|
|
for (j = 0; j < filter->input_count; j++)
|
|
pick_format(filter->inputs[j]);
|
|
for (j = 0; j < filter->output_count; j++)
|
|
pick_format(filter->outputs[j]);
|
|
}
|
|
}
|
|
|
|
int ff_avfilter_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 pick the first one. */
|
|
pick_formats(graph);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
|
|
{
|
|
int ret;
|
|
|
|
if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))
|
|
return ret;
|
|
if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))
|
|
return ret;
|
|
if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|