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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 "avfilter.h"
#include "avfiltergraph.h"
void avfilter_destroy_graph(AVFilterGraph *graph)
{
for(; graph->filter_count > 0; graph->filter_count --)
avfilter_destroy(graph->filters[graph->filter_count - 1]);
av_freep(&graph->filters);
}
void avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
{
graph->filters = av_realloc(graph->filters,
sizeof(AVFilterContext*) * ++graph->filter_count);
graph->filters[graph->filter_count - 1] = filter;
}
AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
{
int i;
if(!name)
return NULL;
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)
{
int i, j;
/* ask all the sub-filters for their supported colorspaces */
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;
if(!(link = filter->inputs[j]))
continue;
if(link->in_formats != link->out_formats) {
if(!avfilter_merge_formats(link->in_formats,
link->out_formats)) {
/* couldn't merge format lists. auto-insert scale filter */
AVFilterContext *scale;
if(!(scale =
avfilter_open(avfilter_get_by_name("scale"), NULL)))
return -1;
if(scale->filter->init(scale, NULL, NULL) ||
avfilter_insert_filter(link, scale, 0, 0)) {
avfilter_destroy(scale);
return -1;
}
avfilter_graph_add_filter(graph, scale);
scale->filter->query_formats(scale);
if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,
scale-> inputs[0]->out_formats) ||
!avfilter_merge_formats(scale->outputs[0]->in_formats,
scale->outputs[0]->out_formats))
return -1;
}
}
}
}
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);
}
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 avfilter_graph_config_formats(AVFilterGraph *graph)
{
/* find supported formats from sub-filters, and merge along links */
if(query_formats(graph))
return -1;
/* Once everything is merged, it's possible that we'll still have
* multiple valid colorspace choices. We pick the first one. */
pick_formats(graph);
return 0;
}
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