Cosmetical: alignment
[ffmpeg.git] / libavfilter / avfiltergraph.c
1 /*
2  * filter graphs
3  * copyright (c) 2008 Vitor Sessak
4  * copyright (c) 2007 Bobby Bingham
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include <ctype.h>
24 #include <string.h>
25
26 #include "avfilter.h"
27 #include "avfiltergraph.h"
28
29 void avfilter_destroy_graph(AVFilterGraph *graph)
30 {
31     for(; graph->filter_count > 0; graph->filter_count --)
32         avfilter_destroy(graph->filters[graph->filter_count - 1]);
33     av_freep(&graph->filters);
34 }
35
36 void avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
37 {
38     graph->filters = av_realloc(graph->filters,
39                                 sizeof(AVFilterContext*) * ++graph->filter_count);
40     graph->filters[graph->filter_count - 1] = filter;
41 }
42
43 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
44 {
45     int i;
46
47     if(!name)
48         return NULL;
49
50     for(i = 0; i < graph->filter_count; i ++)
51         if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
52             return graph->filters[i];
53
54     return NULL;
55 }
56
57 static int query_formats(AVFilterGraph *graph)
58 {
59     int i, j;
60
61     /* ask all the sub-filters for their supported colorspaces */
62     for(i = 0; i < graph->filter_count; i ++) {
63         if(graph->filters[i]->filter->query_formats)
64             graph->filters[i]->filter->query_formats(graph->filters[i]);
65         else
66             avfilter_default_query_formats(graph->filters[i]);
67     }
68
69     /* go through and merge as many format lists as possible */
70     for(i = 0; i < graph->filter_count; i ++) {
71         AVFilterContext *filter = graph->filters[i];
72
73         for(j = 0; j < filter->input_count; j ++) {
74             AVFilterLink *link;
75             if(!(link = filter->inputs[j]))
76                 continue;
77             if(link->in_formats != link->out_formats) {
78                 if(!avfilter_merge_formats(link->in_formats,
79                                            link->out_formats)) {
80                     /* couldn't merge format lists. auto-insert scale filter */
81                     AVFilterContext *scale;
82
83                     if(!(scale =
84                          avfilter_open(avfilter_get_by_name("scale"), NULL)))
85                         return -1;
86                     if(scale->filter->init(scale, NULL, NULL) ||
87                        avfilter_insert_filter(link, scale, 0, 0)) {
88                         avfilter_destroy(scale);
89                         return -1;
90                     }
91
92                     avfilter_graph_add_filter(graph, scale);
93                     scale->filter->query_formats(scale);
94                     if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,
95                                                scale-> inputs[0]->out_formats)||
96                        !avfilter_merge_formats(scale->outputs[0]->in_formats,
97                                                scale->outputs[0]->out_formats))
98                         return -1;
99                 }
100             }
101         }
102     }
103
104     return 0;
105 }
106
107 static void pick_format(AVFilterLink *link)
108 {
109     if(!link || !link->in_formats)
110         return;
111
112     link->in_formats->format_count = 1;
113     link->format = link->in_formats->formats[0];
114
115     avfilter_formats_unref(&link->in_formats);
116     avfilter_formats_unref(&link->out_formats);
117 }
118
119 static void pick_formats(AVFilterGraph *graph)
120 {
121     int i, j;
122
123     for(i = 0; i < graph->filter_count; i ++) {
124         AVFilterContext *filter = graph->filters[i];
125
126         for(j = 0; j < filter->input_count; j ++)
127             pick_format(filter->inputs[j]);
128         for(j = 0; j < filter->output_count; j ++)
129             pick_format(filter->outputs[j]);
130     }
131 }
132
133 int avfilter_graph_config_formats(AVFilterGraph *graph)
134 {
135     /* find supported formats from sub-filters, and merge along links */
136     if(query_formats(graph))
137         return -1;
138
139     /* Once everything is merged, it's possible that we'll still have
140      * multiple valid colorspace choices. We pick the first one. */
141     pick_formats(graph);
142
143     return 0;
144 }
145