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/*
* Filter graphs
* 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 <string.h>
#include <stddef.h>
#include "avfilter.h"
#include "avfiltergraph.h"
struct AVFilterGraph {
unsigned filter_count;
AVFilterContext **filters;
};
AVFilterGraph *avfilter_create_graph(void)
{
return av_mallocz(sizeof(AVFilterGraph));
}
static void destroy_graph_filters(AVFilterGraph *graph)
{
for(; graph->filter_count > 0; graph->filter_count --)
avfilter_destroy(graph->filters[graph->filter_count - 1]);
av_freep(&graph->filters);
}
void avfilter_destroy_graph(AVFilterGraph *graph)
{
destroy_graph_filters(graph);
av_free(graph);
}
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;
}
static AVFilterContext *create_filter_with_args(char *filter)
{
AVFilterContext *ret;
char *name, *args;
name = filter;
if((args = strchr(filter, '='))) {
/* ensure we at least have a name */
if(args == filter)
return NULL;
*args ++ = 0;
}
av_log(NULL, AV_LOG_INFO, "creating filter \"%s\" with args \"%s\"\n",
name, args ? args : "(none)");
if((ret = avfilter_create_by_name(name, NULL))) {
if(avfilter_init_filter(ret, args)) {
av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
avfilter_destroy(ret);
ret = NULL;
}
} else av_log(NULL, AV_LOG_ERROR, "error creating filter!\n");
return ret;
}
int avfilter_graph_load_chain(AVFilterGraph *graph,
unsigned count, char **filter_list,
AVFilterContext **first, AVFilterContext **last)
{
unsigned i;
AVFilterContext *filters[2] = {NULL,NULL};
for(i = 0; i < count; i ++) {
if(!(filters[1] = create_filter_with_args(filter_list[i])))
goto fail;
if(i == 0) {
if(first) *first = filters[1];
} else {
if(avfilter_link(filters[0], 0, filters[1], 0)) {
av_log(NULL, AV_LOG_ERROR, "error linking filters!\n");
goto fail;
}
}
avfilter_graph_add_filter(graph, filters[1]);
filters[0] = filters[1];
}
if(last) *last = filters[1];
return 0;
fail:
destroy_graph_filters(graph);
if(first) *first = NULL;
if(last) *last = NULL;
return -1;
}
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