Fix style nits in avfiltergraph.c.
[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 #include "internal.h"
29
30 AVFilterGraph *avfilter_graph_alloc(void)
31 {
32     return av_mallocz(sizeof(AVFilterGraph));
33 }
34
35 void avfilter_graph_free(AVFilterGraph *graph)
36 {
37     for (; graph->filter_count > 0; graph->filter_count --)
38         avfilter_free(graph->filters[graph->filter_count - 1]);
39     av_freep(&graph->scale_sws_opts);
40     av_freep(&graph->filters);
41 }
42
43 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
44 {
45     AVFilterContext **filters = av_realloc(graph->filters,
46                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
47     if (!filters)
48         return AVERROR(ENOMEM);
49
50     graph->filters = filters;
51     graph->filters[graph->filter_count++] = filter;
52
53     return 0;
54 }
55
56 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
57                                  const char *name, const char *args, void *opaque,
58                                  AVFilterGraph *graph_ctx)
59 {
60     int ret;
61
62     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
63         goto fail;
64     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
65         goto fail;
66     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
67         goto fail;
68     return 0;
69
70 fail:
71     if (*filt_ctx)
72         avfilter_free(*filt_ctx);
73     *filt_ctx = NULL;
74     return ret;
75 }
76
77 int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
78 {
79     AVFilterContext *filt;
80     int i, j;
81
82     for (i = 0; i < graph->filter_count; i++) {
83         filt = graph->filters[i];
84
85         for (j = 0; j < filt->input_count; j++) {
86             if (!filt->inputs[j] || !filt->inputs[j]->src) {
87                 av_log(log_ctx, AV_LOG_ERROR,
88                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
89                        filt->input_pads[j].name, filt->name, filt->filter->name);
90                 return -1;
91             }
92         }
93
94         for (j = 0; j < filt->output_count; j++) {
95             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
96                 av_log(log_ctx, AV_LOG_ERROR,
97                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
98                        filt->output_pads[j].name, filt->name, filt->filter->name);
99                 return -1;
100             }
101         }
102     }
103
104     return 0;
105 }
106
107 int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
108 {
109     AVFilterContext *filt;
110     int i, ret;
111
112     for (i=0; i < graph->filter_count; i++) {
113         filt = graph->filters[i];
114
115         if (!filt->output_count) {
116             if ((ret = avfilter_config_links(filt)))
117                 return ret;
118         }
119     }
120
121     return 0;
122 }
123
124 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
125 {
126     int i;
127
128     for (i = 0; i < graph->filter_count; i++)
129         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
130             return graph->filters[i];
131
132     return NULL;
133 }
134
135 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
136 {
137     int i, j, ret;
138     int scaler_count = 0;
139     char inst_name[30];
140
141     /* ask all the sub-filters for their supported media formats */
142     for (i = 0; i < graph->filter_count; i++) {
143         if (graph->filters[i]->filter->query_formats)
144             graph->filters[i]->filter->query_formats(graph->filters[i]);
145         else
146             avfilter_default_query_formats(graph->filters[i]);
147     }
148
149     /* go through and merge as many format lists as possible */
150     for (i = 0; i < graph->filter_count; i++) {
151         AVFilterContext *filter = graph->filters[i];
152
153         for (j = 0; j < filter->input_count; j++) {
154             AVFilterLink *link = filter->inputs[j];
155             if (link && link->in_formats != link->out_formats) {
156                 if (!avfilter_merge_formats(link->in_formats,
157                                             link->out_formats)) {
158                     AVFilterContext *scale;
159                     char scale_args[256];
160                     /* couldn't merge format lists. auto-insert scale filter */
161                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
162                              scaler_count++);
163                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
164                     if ((ret = avfilter_graph_create_filter(&scale, avfilter_get_by_name("scale"),
165                                                             inst_name, scale_args, NULL, graph)) < 0)
166                         return ret;
167                     if ((ret = avfilter_insert_filter(link, scale, 0, 0)) < 0)
168                         return ret;
169
170                     scale->filter->query_formats(scale);
171                     if (((link = scale-> inputs[0]) &&
172                          !avfilter_merge_formats(link->in_formats, link->out_formats)) ||
173                         ((link = scale->outputs[0]) &&
174                          !avfilter_merge_formats(link->in_formats, link->out_formats))) {
175                         av_log(log_ctx, AV_LOG_ERROR,
176                                "Impossible to convert between the formats supported by the filter "
177                                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
178                         return -1;
179                     }
180                 }
181             }
182         }
183     }
184
185     return 0;
186 }
187
188 static void pick_format(AVFilterLink *link)
189 {
190     if (!link || !link->in_formats)
191         return;
192
193     link->in_formats->format_count = 1;
194     link->format = link->in_formats->formats[0];
195
196     avfilter_formats_unref(&link->in_formats);
197     avfilter_formats_unref(&link->out_formats);
198 }
199
200 static void pick_formats(AVFilterGraph *graph)
201 {
202     int i, j;
203
204     for (i = 0; i < graph->filter_count; i++) {
205         AVFilterContext *filter = graph->filters[i];
206
207         for (j = 0; j < filter->input_count; j++)
208             pick_format(filter->inputs[j]);
209         for (j = 0; j < filter->output_count; j++)
210             pick_format(filter->outputs[j]);
211     }
212 }
213
214 int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
215 {
216     /* find supported formats from sub-filters, and merge along links */
217     if (query_formats(graph, log_ctx))
218         return -1;
219
220     /* Once everything is merged, it's possible that we'll still have
221      * multiple valid media format choices. We pick the first one. */
222     pick_formats(graph);
223
224     return 0;
225 }
226
227 int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx)
228 {
229     int ret;
230
231     if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))
232         return ret;
233     if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))
234         return ret;
235     if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))
236         return ret;
237
238     return 0;
239 }