segafilm: use the sample rate as the time base for audio streams
[ffmpeg.git] / tools / graph2dot.c
1 /*
2  * Copyright (c) 2008-2010 Stefano Sabatini
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20
21 #include <unistd.h>             /* getopt */
22
23 #include "libavutil/pixdesc.h"
24 #include "libavutil/audioconvert.h"
25 #include "libavfilter/avfiltergraph.h"
26
27 static void usage(void)
28 {
29     printf("Convert a libavfilter graph to a dot file\n");
30     printf("Usage: graph2dot [OPTIONS]\n");
31     printf("\n"
32            "Options:\n"
33            "-i INFILE         set INFILE as input file, stdin if omitted\n"
34            "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
35            "-h                print this help\n");
36 }
37
38 struct line {
39     char data[256];
40     struct line *next;
41 };
42
43 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
44 {
45     int i, j;
46
47     fprintf(outfile, "digraph G {\n");
48     fprintf(outfile, "node [shape=box]\n");
49     fprintf(outfile, "rankdir=LR\n");
50
51     for (i = 0; i < graph->filter_count; i++) {
52         char filter_ctx_label[128];
53         const AVFilterContext *filter_ctx = graph->filters[i];
54
55         snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
56                  filter_ctx->name,
57                  filter_ctx->filter->name);
58
59         for (j = 0; j < filter_ctx->output_count; j++) {
60             AVFilterLink *link = filter_ctx->outputs[j];
61             if (link) {
62                 char dst_filter_ctx_label[128];
63                 const AVFilterContext *dst_filter_ctx = link->dst;
64
65                 snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
66                          "%s (%s)",
67                          dst_filter_ctx->name,
68                          dst_filter_ctx->filter->name);
69
70                 fprintf(outfile, "\"%s\" -> \"%s\"",
71                         filter_ctx_label, dst_filter_ctx_label);
72                 if (link->type == AVMEDIA_TYPE_VIDEO) {
73                     fprintf(outfile,
74                             " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ]",
75                             av_pix_fmt_descriptors[link->format].name,
76                             link->w, link->h, link->time_base.num,
77                             link->time_base.den);
78                 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
79                     char buf[255];
80                     av_get_channel_layout_string(buf, sizeof(buf), -1,
81                                                  link->channel_layout);
82                     fprintf(outfile,
83                             " [ label= \"fmt:%s sr:%"PRId64 " cl:%s\" ]",
84                             av_get_sample_fmt_name(link->format),
85                             link->sample_rate, buf);
86                 }
87                 fprintf(outfile, ";\n");
88             }
89         }
90     }
91     fprintf(outfile, "}\n");
92 }
93
94 int main(int argc, char **argv)
95 {
96     const char *outfilename = NULL;
97     const char *infilename  = NULL;
98     FILE *outfile           = NULL;
99     FILE *infile            = NULL;
100     char *graph_string      = NULL;
101     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
102     char c;
103
104     av_log_set_level(AV_LOG_DEBUG);
105
106     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
107         switch (c) {
108         case 'h':
109             usage();
110             return 0;
111         case 'i':
112             infilename = optarg;
113             break;
114         case 'o':
115             outfilename = optarg;
116             break;
117         case '?':
118             return 1;
119         }
120     }
121
122     if (!infilename || !strcmp(infilename, "-"))
123         infilename = "/dev/stdin";
124     infile = fopen(infilename, "r");
125     if (!infile) {
126         fprintf(stderr, "Impossible to open input file '%s': %s\n",
127                 infilename, strerror(errno));
128         return 1;
129     }
130
131     if (!outfilename || !strcmp(outfilename, "-"))
132         outfilename = "/dev/stdout";
133     outfile = fopen(outfilename, "w");
134     if (!outfile) {
135         fprintf(stderr, "Impossible to open output file '%s': %s\n",
136                 outfilename, strerror(errno));
137         return 1;
138     }
139
140     /* read from infile and put it in a buffer */
141     {
142         unsigned int count = 0;
143         struct line *line, *last_line, *first_line;
144         char *p;
145         last_line = first_line = av_malloc(sizeof(struct line));
146
147         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
148             struct line *new_line = av_malloc(sizeof(struct line));
149             count += strlen(last_line->data);
150             last_line->next = new_line;
151             last_line       = new_line;
152         }
153         last_line->next = NULL;
154
155         graph_string = av_malloc(count + 1);
156         p = graph_string;
157         for (line = first_line; line->next; line = line->next) {
158             unsigned int l = strlen(line->data);
159             memcpy(p, line->data, l);
160             p += l;
161         }
162         *p = '\0';
163     }
164
165     avfilter_register_all();
166
167     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
168         fprintf(stderr, "Impossible to parse the graph description\n");
169         return 1;
170     }
171
172     if (avfilter_graph_config(graph, NULL) < 0)
173         return 1;
174
175     print_digraph(outfile, graph);
176     fflush(outfile);
177
178     return 0;
179 }