269d566d5f50121934ec06b089412951e1b35fcf
[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_graph_destroy(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->scale_sws_opts);
34     av_freep(&graph->filters);
35 }
36
37 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
38 {
39     graph->filters = av_realloc(graph->filters,
40                                 sizeof(AVFilterContext*) * ++graph->filter_count);
41
42     if (!graph->filters)
43         return -1;
44
45     graph->filters[graph->filter_count - 1] = filter;
46
47     return 0;
48 }
49
50 int avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
51 {
52     AVFilterContext *filt;
53     int i, j;
54
55     for (i=0; i < graph->filter_count; i++) {
56         filt = graph->filters[i];
57
58         for (j = 0; j < filt->input_count; j++) {
59             if (!filt->inputs[j] || !filt->inputs[j]->src) {
60                 av_log(log_ctx, AV_LOG_ERROR,
61                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
62                        filt->input_pads[j].name, filt->name, filt->filter->name);
63                 return -1;
64             }
65         }
66
67         for (j = 0; j < filt->output_count; j++) {
68             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
69                 av_log(log_ctx, AV_LOG_ERROR,
70                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
71                        filt->output_pads[j].name, filt->name, filt->filter->name);
72                 return -1;
73             }
74         }
75     }
76
77     return 0;
78 }
79
80 int avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
81 {
82     AVFilterContext *filt;
83     int i, ret;
84
85     for (i=0; i < graph->filter_count; i++) {
86         filt = graph->filters[i];
87
88         if (!filt->output_count) {
89             if ((ret = avfilter_config_links(filt)))
90                 return ret;
91         }
92     }
93
94     return 0;
95 }
96
97 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
98 {
99     int i;
100
101     for(i = 0; i < graph->filter_count; i ++)
102         if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
103             return graph->filters[i];
104
105     return NULL;
106 }
107
108 static int query_formats(AVFilterGraph *graph)
109 {
110     int i, j;
111     int scaler_count = 0;
112     char inst_name[30];
113
114     /* ask all the sub-filters for their supported colorspaces */
115     for(i = 0; i < graph->filter_count; i ++) {
116         if(graph->filters[i]->filter->query_formats)
117             graph->filters[i]->filter->query_formats(graph->filters[i]);
118         else
119             avfilter_default_query_formats(graph->filters[i]);
120     }
121
122     /* go through and merge as many format lists as possible */
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             AVFilterLink *link = filter->inputs[j];
128             if(link && link->in_formats != link->out_formats) {
129                 if(!avfilter_merge_formats(link->in_formats,
130                                            link->out_formats)) {
131                     AVFilterContext *scale;
132                     char scale_args[256];
133                     /* couldn't merge format lists. auto-insert scale filter */
134                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
135                              scaler_count);
136                     scale =
137                         avfilter_open(avfilter_get_by_name("scale"),inst_name);
138
139                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
140                     if(!scale || scale->filter->init(scale, scale_args, NULL) ||
141                                  avfilter_insert_filter(link, scale, 0, 0)) {
142                         avfilter_destroy(scale);
143                         return -1;
144                     }
145
146                     if (avfilter_graph_add_filter(graph, scale) < 0)
147                         return -1;
148
149                     scale->filter->query_formats(scale);
150                     if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,
151                                                scale-> inputs[0]->out_formats)||
152                        !avfilter_merge_formats(scale->outputs[0]->in_formats,
153                                                scale->outputs[0]->out_formats))
154                         return -1;
155                 }
156             }
157         }
158     }
159
160     return 0;
161 }
162
163 static void pick_format(AVFilterLink *link)
164 {
165     if(!link || !link->in_formats)
166         return;
167
168     link->in_formats->format_count = 1;
169     link->format = link->in_formats->formats[0];
170
171     avfilter_formats_unref(&link->in_formats);
172     avfilter_formats_unref(&link->out_formats);
173 }
174
175 static void pick_formats(AVFilterGraph *graph)
176 {
177     int i, j;
178
179     for(i = 0; i < graph->filter_count; i ++) {
180         AVFilterContext *filter = graph->filters[i];
181
182         for(j = 0; j < filter->input_count; j ++)
183             pick_format(filter->inputs[j]);
184         for(j = 0; j < filter->output_count; j ++)
185             pick_format(filter->outputs[j]);
186     }
187 }
188
189 int avfilter_graph_config_formats(AVFilterGraph *graph)
190 {
191     /* find supported formats from sub-filters, and merge along links */
192     if(query_formats(graph))
193         return -1;
194
195     /* Once everything is merged, it's possible that we'll still have
196      * multiple valid colorspace choices. We pick the first one. */
197     pick_formats(graph);
198
199     return 0;
200 }
201