3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "avfiltergraph.h"
29 struct AVFilterGraph {
30 unsigned filter_count;
31 AVFilterContext **filters;
34 AVFilterGraph *avfilter_create_graph(void)
36 return av_mallocz(sizeof(AVFilterGraph));
39 static void destroy_graph_filters(AVFilterGraph *graph)
41 for(; graph->filter_count > 0; graph->filter_count --)
42 avfilter_destroy(graph->filters[graph->filter_count - 1]);
43 av_freep(&graph->filters);
46 void avfilter_destroy_graph(AVFilterGraph *graph)
48 destroy_graph_filters(graph);
52 void avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
54 graph->filters = av_realloc(graph->filters,
55 sizeof(AVFilterContext*) * ++graph->filter_count);
56 graph->filters[graph->filter_count - 1] = filter;
59 static AVFilterContext *create_filter_with_args(const char *filt, void *opaque)
62 char *filter = av_strdup(filt); /* copy - don't mangle the input string */
66 if((args = strchr(filter, '='))) {
67 /* ensure we at least have a name */
74 av_log(NULL, AV_LOG_INFO, "creating filter \"%s\" with args \"%s\"\n",
75 name, args ? args : "(none)");
77 if((ret = avfilter_create_by_name(name, NULL))) {
78 if(avfilter_init_filter(ret, args, opaque)) {
79 av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
80 avfilter_destroy(ret);
83 } else av_log(NULL, AV_LOG_ERROR, "error creating filter!\n");
92 int avfilter_graph_load_chain(AVFilterGraph *graph,
93 unsigned count, char **filter_list, void **opaque,
94 AVFilterContext **first, AVFilterContext **last)
97 AVFilterContext *filters[2] = {NULL,NULL};
99 for(i = 0; i < count; i ++) {
102 if(opaque) op = opaque[i];
105 if(!(filters[1] = create_filter_with_args(filter_list[i], op)))
108 if(first) *first = filters[1];
110 if(avfilter_link(filters[0], 0, filters[1], 0)) {
111 av_log(NULL, AV_LOG_ERROR, "error linking filters!\n");
115 avfilter_graph_add_filter(graph, filters[1]);
116 filters[0] = filters[1];
119 if(last) *last = filters[1];
123 destroy_graph_filters(graph);
124 if(first) *first = NULL;
125 if(last) *last = NULL;