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 }