tools/graph2dot.c

   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
  28 #include "libavutil/channel_layout.h"
  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                         avfilter_pad_get_name(link->srcpad, 0),
  83                         avfilter_pad_get_name(link->dstpad, 0));
  84
  85                 if (link->type == AVMEDIA_TYPE_VIDEO) {
  86                     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
  87                     fprintf(outfile,
  88                             "fmt:%s w:%d h:%d tb:%d/%d",
  89                             desc->name,
  90                             link->w, link->h,
  91                             link->time_base.num, link->time_base.den);
  92                 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
  93                     char buf[255];
  94                     av_get_channel_layout_string(buf, sizeof(buf), -1,
  95                                                  link->channel_layout);
  96                     fprintf(outfile,
  97                             "fmt:%s sr:%d cl:%s tb:%d/%d",
  98                             av_get_sample_fmt_name(link->format),
  99                             link->sample_rate, buf,
 100                             link->time_base.num, link->time_base.den);
 101                 }
 102                 fprintf(outfile, "\" ];\n");
 103             }
 104         }
 105     }
 106     fprintf(outfile, "}\n");
 107 }
 108
 109 int main(int argc, char **argv)
 110 {
 111     const char *outfilename = NULL;
 112     const char *infilename  = NULL;
 113     FILE *outfile           = NULL;
 114     FILE *infile            = NULL;
 115     char *graph_string      = NULL;
 116     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
 117     char c;
 118
 119     av_log_set_level(AV_LOG_DEBUG);
 120
 121     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
 122         switch (c) {
 123         case 'h':
 124             usage();
 125             return 0;
 126         case 'i':
 127             infilename = optarg;
 128             break;
 129         case 'o':
 130             outfilename = optarg;
 131             break;
 132         case '?':
 133             return 1;
 134         }
 135     }
 136
 137     if (!infilename || !strcmp(infilename, "-"))
 138         infilename = "/dev/stdin";
 139     infile = fopen(infilename, "r");
 140     if (!infile) {
 141         fprintf(stderr, "Failed to open input file '%s': %s\n",
 142                 infilename, strerror(errno));
 143         return 1;
 144     }
 145
 146     if (!outfilename || !strcmp(outfilename, "-"))
 147         outfilename = "/dev/stdout";
 148     outfile = fopen(outfilename, "w");
 149     if (!outfile) {
 150         fprintf(stderr, "Failed to open output file '%s': %s\n",
 151                 outfilename, strerror(errno));
 152         return 1;
 153     }
 154
 155     /* read from infile and put it in a buffer */
 156     {
 157         int64_t count = 0;
 158         struct line *line, *last_line, *first_line;
 159         char *p;
 160         last_line = first_line = av_malloc(sizeof(struct line));
 161         if (!last_line) {
 162             fprintf(stderr, "Memory allocation failure\n");
 163             return 1;
 164         }
 165
 166         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
 167             struct line *new_line = av_malloc(sizeof(struct line));
 168             if (!new_line) {
 169                 fprintf(stderr, "Memory allocation failure\n");
 170                 return 1;
 171             }
 172             count += strlen(last_line->data);
 173             last_line->next = new_line;
 174             last_line       = new_line;
 175         }
 176         last_line->next = NULL;
 177
 178         graph_string = av_malloc(count + 1);
 179         if (!graph_string) {
 180             fprintf(stderr, "Memory allocation failure\n");
 181             return 1;
 182         }
 183         p = graph_string;
 184         for (line = first_line; line->next; line = line->next) {
 185             size_t l = strlen(line->data);
 186             memcpy(p, line->data, l);
 187             p += l;
 188         }
 189         *p = '\0';
 190     }
 191
 192     avfilter_register_all();
 193
 194     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
 195         fprintf(stderr, "Failed to parse the graph description\n");
 196         return 1;
 197     }
 198
 199     if (avfilter_graph_config(graph, NULL) < 0)
 200         return 1;
 201
 202     print_digraph(outfile, graph);
 203     fflush(outfile);
 204
 205     return 0;
 206 }