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graph2dot.c
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1 /*
2  * Copyright (c) 2008-2010 Stefano Sabatini
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "config.h"
22 #if HAVE_UNISTD_H
23 #include <unistd.h> /* getopt */
24 #endif
25 #include <stdio.h>
26 #include <string.h>
27 
29 #include "libavutil/mem.h"
30 #include "libavutil/pixdesc.h"
31 #include "libavfilter/avfilter.h"
32 
33 #if !HAVE_GETOPT
34 #include "compat/getopt.c"
35 #endif
36 
37 static void usage(void)
38 {
39  printf("Convert a libavfilter graph to a dot file.\n");
40  printf("Usage: graph2dot [OPTIONS]\n");
41  printf("\n"
42  "Options:\n"
43  "-i INFILE set INFILE as input file, stdin if omitted\n"
44  "-o OUTFILE set OUTFILE as output file, stdout if omitted\n"
45  "-h print this help\n");
46 }
47 
48 struct line {
49  char data[256];
50  struct line *next;
51 };
52 
53 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
54 {
55  int i, j;
56 
57  fprintf(outfile, "digraph G {\n");
58  fprintf(outfile, "node [shape=box]\n");
59  fprintf(outfile, "rankdir=LR\n");
60 
61  for (i = 0; i < graph->nb_filters; i++) {
62  char filter_ctx_label[128];
63  const AVFilterContext *filter_ctx = graph->filters[i];
64 
65  snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s\\n(%s)",
66  filter_ctx->name,
67  filter_ctx->filter->name);
68 
69  for (j = 0; j < filter_ctx->nb_outputs; j++) {
70  AVFilterLink *link = filter_ctx->outputs[j];
71  if (link) {
72  char dst_filter_ctx_label[128];
73  const AVFilterContext *dst_filter_ctx = link->dst;
74 
75  snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
76  "%s\\n(%s)",
77  dst_filter_ctx->name,
78  dst_filter_ctx->filter->name);
79 
80  fprintf(outfile, "\"%s\" -> \"%s\" [ label= \"inpad:%s -> outpad:%s\\n",
81  filter_ctx_label, dst_filter_ctx_label,
82  link->srcpad->name, link->dstpad->name);
83 
84  if (link->type == AVMEDIA_TYPE_VIDEO) {
85  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
86  fprintf(outfile,
87  "fmt:%s w:%d h:%d tb:%d/%d",
88  desc->name,
89  link->w, link->h,
90  link->time_base.num, link->time_base.den);
91  } else if (link->type == AVMEDIA_TYPE_AUDIO) {
92  char buf[255];
93  av_get_channel_layout_string(buf, sizeof(buf), -1,
94  link->channel_layout);
95  fprintf(outfile,
96  "fmt:%s sr:%d cl:%s tb:%d/%d",
98  link->sample_rate, buf,
99  link->time_base.num, link->time_base.den);
100  }
101  fprintf(outfile, "\" ];\n");
102  }
103  }
104  }
105  fprintf(outfile, "}\n");
106 }
107 
108 int main(int argc, char **argv)
109 {
110  const char *outfilename = NULL;
111  const char *infilename = NULL;
112  FILE *outfile = NULL;
113  FILE *infile = NULL;
114  char *graph_string = NULL;
115  AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
116  char c;
117 
119 
120  while ((c = getopt(argc, argv, "hi:o:")) != -1) {
121  switch (c) {
122  case 'h':
123  usage();
124  return 0;
125  case 'i':
126  infilename = optarg;
127  break;
128  case 'o':
129  outfilename = optarg;
130  break;
131  case '?':
132  return 1;
133  }
134  }
135 
136  if (!infilename || !strcmp(infilename, "-"))
137  infilename = "/dev/stdin";
138  infile = fopen(infilename, "r");
139  if (!infile) {
140  fprintf(stderr, "Failed to open input file '%s': %s\n",
141  infilename, strerror(errno));
142  return 1;
143  }
144 
145  if (!outfilename || !strcmp(outfilename, "-"))
146  outfilename = "/dev/stdout";
147  outfile = fopen(outfilename, "w");
148  if (!outfile) {
149  fprintf(stderr, "Failed to open output file '%s': %s\n",
150  outfilename, strerror(errno));
151  return 1;
152  }
153 
154  /* read from infile and put it in a buffer */
155  {
156  unsigned int count = 0;
157  struct line *line, *last_line, *first_line;
158  char *p;
159  last_line = first_line = av_malloc(sizeof(struct line));
160  if (!last_line) {
161  fprintf(stderr, "Memory allocation failure\n");
162  return 1;
163  }
164 
165  while (fgets(last_line->data, sizeof(last_line->data), infile)) {
166  struct line *new_line = av_malloc(sizeof(struct line));
167  if (!new_line) {
168  fprintf(stderr, "Memory allocation failure\n");
169  return 1;
170  }
171  count += strlen(last_line->data);
172  last_line->next = new_line;
173  last_line = new_line;
174  }
175  last_line->next = NULL;
176 
177  graph_string = av_malloc(count + 1);
178  if (!graph_string) {
179  fprintf(stderr, "Memory allocation failure\n");
180  return 1;
181  }
182  p = graph_string;
183  for (line = first_line; line->next; line = line->next) {
184  unsigned int l = strlen(line->data);
185  memcpy(p, line->data, l);
186  p += l;
187  }
188  *p = '\0';
189  }
190 
192 
193  if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
194  fprintf(stderr, "Failed to parse the graph description\n");
195  return 1;
196  }
197 
198  if (avfilter_graph_config(graph, NULL) < 0)
199  return 1;
200 
201  print_digraph(outfile, graph);
202  fflush(outfile);
203 
204  return 0;
205 }