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 "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 "libavutil/audioconvert.h"
  32 #include "libavfilter/avfilter.h"
  33
  34 #if !HAVE_GETOPT
  35 #include "compat/getopt.c"
  36 #endif
  37
  38 static void usage(void)
  39 {
  40     printf("Convert a libavfilter graph to a dot file.\n");
  41     printf("Usage: graph2dot [OPTIONS]\n");
  42     printf("\n"
  43            "Options:\n"
  44            "-i INFILE         set INFILE as input file, stdin if omitted\n"
  45            "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
  46            "-h                print this help\n");
  47 }
  48
  49 struct line {
  50     char data[256];
  51     struct line *next;
  52 };
  53
  54 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
  55 {
  56     int i, j;
  57
  58     fprintf(outfile, "digraph G {\n");
  59     fprintf(outfile, "node [shape=box]\n");
  60     fprintf(outfile, "rankdir=LR\n");
  61
  62     for (i = 0; i < graph->nb_filters; i++) {
  63         char filter_ctx_label[128];
  64         const AVFilterContext *filter_ctx = graph->filters[i];
  65
  66         snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
  67                  filter_ctx->name,
  68                  filter_ctx->filter->name);
  69
  70         for (j = 0; j < filter_ctx->nb_outputs; j++) {
  71             AVFilterLink *link = filter_ctx->outputs[j];
  72             if (link) {
  73                 char dst_filter_ctx_label[128];
  74                 const AVFilterContext *dst_filter_ctx = link->dst;
  75
  76                 snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
  77                          "%s (%s)",
  78                          dst_filter_ctx->name,
  79                          dst_filter_ctx->filter->name);
  80
  81                 fprintf(outfile, "\"%s\" -> \"%s\"",
  82                         filter_ctx_label, dst_filter_ctx_label);
  83                 if (link->type == AVMEDIA_TYPE_VIDEO) {
  84                     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
  85                     fprintf(outfile,
  86                             " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ]",
  87                             desc->name, link->w, link->h, link->time_base.num,
  88                             link->time_base.den);
  89                 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
  90                     char buf[255];
  91                     av_get_channel_layout_string(buf, sizeof(buf), -1,
  92                                                  link->channel_layout);
  93                     fprintf(outfile,
  94                             " [ label= \"fmt:%s sr:%d cl:%s\" ]",
  95                             av_get_sample_fmt_name(link->format),
  96                             link->sample_rate, buf);
  97                 }
  98                 fprintf(outfile, ";\n");
  99             }
 100         }
 101     }
 102     fprintf(outfile, "}\n");
 103 }
 104
 105 int main(int argc, char **argv)
 106 {
 107     const char *outfilename = NULL;
 108     const char *infilename  = NULL;
 109     FILE *outfile           = NULL;
 110     FILE *infile            = NULL;
 111     char *graph_string      = NULL;
 112     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
 113     char c;
 114
 115     av_log_set_level(AV_LOG_DEBUG);
 116
 117     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
 118         switch (c) {
 119         case 'h':
 120             usage();
 121             return 0;
 122         case 'i':
 123             infilename = optarg;
 124             break;
 125         case 'o':
 126             outfilename = optarg;
 127             break;
 128         case '?':
 129             return 1;
 130         }
 131     }
 132
 133     if (!infilename || !strcmp(infilename, "-"))
 134         infilename = "/dev/stdin";
 135     infile = fopen(infilename, "r");
 136     if (!infile) {
 137         fprintf(stderr, "Failed to open input file '%s': %s\n",
 138                 infilename, strerror(errno));
 139         return 1;
 140     }
 141
 142     if (!outfilename || !strcmp(outfilename, "-"))
 143         outfilename = "/dev/stdout";
 144     outfile = fopen(outfilename, "w");
 145     if (!outfile) {
 146         fprintf(stderr, "Failed to open output file '%s': %s\n",
 147                 outfilename, strerror(errno));
 148         return 1;
 149     }
 150
 151     /* read from infile and put it in a buffer */
 152     {
 153         unsigned int count = 0;
 154         struct line *line, *last_line, *first_line;
 155         char *p;
 156         last_line = first_line = av_malloc(sizeof(struct line));
 157
 158         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
 159             struct line *new_line = av_malloc(sizeof(struct line));
 160             count += strlen(last_line->data);
 161             last_line->next = new_line;
 162             last_line       = new_line;
 163         }
 164         last_line->next = NULL;
 165
 166         graph_string = av_malloc(count + 1);
 167         p = graph_string;
 168         for (line = first_line; line->next; line = line->next) {
 169             unsigned int l = strlen(line->data);
 170             memcpy(p, line->data, l);
 171             p += l;
 172         }
 173         *p = '\0';
 174     }
 175
 176     avfilter_register_all();
 177
 178     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
 179         fprintf(stderr, "Failed to parse the graph description\n");
 180         return 1;
 181     }
 182
 183     if (avfilter_graph_config(graph, NULL) < 0)
 184         return 1;
 185
 186     print_digraph(outfile, graph);
 187     fflush(outfile);
 188
 189     return 0;
 190 }