git.sesse.net Git - ffmpeg/blob - 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                         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",
  97                             av_get_sample_fmt_name(link->format),
  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
 118     av_log_set_level(AV_LOG_DEBUG);
 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
 191     avfilter_register_all();
 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 }