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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 "avstring.h"
#include "avfilter.h"
#include "avfiltergraph.h"
typedef struct AVFilterGraph {
unsigned filter_count;
AVFilterContext **filters;
} GraphContext;
static void uninit(AVFilterContext *ctx)
{
GraphContext *graph = ctx->priv;
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(AVFilterContext *graphctx, AVFilterContext *filter)
{
GraphContext *graph = graphctx->priv;
graph->filters = av_realloc(graph->filters,
sizeof(AVFilterContext*) * ++graph->filter_count);
graph->filters[graph->filter_count - 1] = filter;
}
static AVFilterContext *create_filter_with_args(const char *filt, void *opaque)
{
AVFilterContext *ret;
char *filter = av_strdup(filt); /* copy - don't mangle the input string */
char *name, *args;
name = filter;
if((args = strchr(filter, '='))) {
/* ensure we at least have a name */
if(args == filter)
goto fail;
*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, opaque)) {
av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
avfilter_destroy(ret);
goto fail;
}
} else av_log(NULL, AV_LOG_ERROR, "error creating filter!\n");
av_free(filter);
return ret;
fail:
av_free(filter);
return NULL;
}
static int graph_load_chain(AVFilterContext *graphctx,
unsigned count, char **filter_list, void **opaque,
AVFilterContext **first, AVFilterContext **last)
{
unsigned i;
AVFilterContext *filters[2] = {NULL,NULL};
for(i = 0; i < count; i ++) {
void *op;
if(opaque) op = opaque[i];
else op = NULL;
if(!(filters[1] = create_filter_with_args(filter_list[i], op)))
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(graphctx, filters[1]);
filters[0] = filters[1];
}
if(last) *last = filters[1];
return 0;
fail:
uninit(graphctx);
if(first) *first = NULL;
if(last) *last = NULL;
return -1;
}
static int graph_load_chain_from_string(AVFilterContext *ctx, const char *str,
AVFilterContext **first,
AVFilterContext **last)
{
int count, ret = 0;
char **strings;
char *filt;
strings = av_malloc(sizeof(char *));
strings[0] = av_strdup(str);
filt = strchr(strings[0], ',');
for(count = 1; filt; count ++) {
if(filt == strings[count-1]) {
ret = -1;
goto done;
}
strings = av_realloc(strings, sizeof(char *) * (count+1));
strings[count] = filt + 1;
*filt = '\0';
filt = strchr(strings[count], ',');
}
ret = graph_load_chain(ctx, count, strings, NULL, first, last);
done:
av_free(strings[0]);
av_free(strings);
return ret;
}
static int init(AVFilterContext *ctx, const char *args, void *opaque)
{
AVFilterContext **filters = opaque;
if(!args)
return 0;
if(!opaque)
return -1;
return graph_load_chain_from_string(ctx, args, filters, filters + 1);
}
AVFilter vf_graph =
{
.name = "graph",
.author = "Bobby Bingham",
.priv_size = sizeof(GraphContext),
.init = init,
.uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = NULL, }},
.outputs = (AVFilterPad[]) {{ .name = NULL, }},
};
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