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/mem.h"
  29 #include "libavutil/pixdesc.h"
  30 #include "libavutil/audioconvert.h"
  31 #include "libavfilter/avfiltergraph.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->filter_count; 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 (%s)",
  66                  filter_ctx->name,
  67                  filter_ctx->filter->name);
  68
  69         for (j = 0; j < filter_ctx->output_count; 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 (%s)",
  77                          dst_filter_ctx->name,
  78                          dst_filter_ctx->filter->name);
  79
  80                 fprintf(outfile, "\"%s\" -> \"%s\"",
  81                         filter_ctx_label, dst_filter_ctx_label);
  82                 if (link->type == AVMEDIA_TYPE_VIDEO) {
  83                     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
  84                     fprintf(outfile,
  85                             " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ]",
  86                             desc->name, link->w, link->h, link->time_base.num,
  87                             link->time_base.den);
  88                 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
  89                     char buf[255];
  90                     av_get_channel_layout_string(buf, sizeof(buf), -1,
  91                                                  link->channel_layout);
  92                     fprintf(outfile,
  93                             " [ label= \"fmt:%s sr:%d cl:%s\" ]",
  94                             av_get_sample_fmt_name(link->format),
  95                             link->sample_rate, buf);
  96                 }
  97                 fprintf(outfile, ";\n");
  98             }
  99         }
 100     }
 101     fprintf(outfile, "}\n");
 102 }
 103
 104 int main(int argc, char **argv)
 105 {
 106     const char *outfilename = NULL;
 107     const char *infilename  = NULL;
 108     FILE *outfile           = NULL;
 109     FILE *infile            = NULL;
 110     char *graph_string      = NULL;
 111     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
 112     char c;
 113
 114     av_log_set_level(AV_LOG_DEBUG);
 115
 116     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
 117         switch (c) {
 118         case 'h':
 119             usage();
 120             return 0;
 121         case 'i':
 122             infilename = optarg;
 123             break;
 124         case 'o':
 125             outfilename = optarg;
 126             break;
 127         case '?':
 128             return 1;
 129         }
 130     }
 131
 132     if (!infilename || !strcmp(infilename, "-"))
 133         infilename = "/dev/stdin";
 134     infile = fopen(infilename, "r");
 135     if (!infile) {
 136         fprintf(stderr, "Impossible to open input file '%s': %s\n",
 137                 infilename, strerror(errno));
 138         return 1;
 139     }
 140
 141     if (!outfilename || !strcmp(outfilename, "-"))
 142         outfilename = "/dev/stdout";
 143     outfile = fopen(outfilename, "w");
 144     if (!outfile) {
 145         fprintf(stderr, "Impossible to open output file '%s': %s\n",
 146                 outfilename, strerror(errno));
 147         return 1;
 148     }
 149
 150     /* read from infile and put it in a buffer */
 151     {
 152         unsigned int count = 0;
 153         struct line *line, *last_line, *first_line;
 154         char *p;
 155         last_line = first_line = av_malloc(sizeof(struct line));
 156
 157         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
 158             struct line *new_line = av_malloc(sizeof(struct line));
 159             count += strlen(last_line->data);
 160             last_line->next = new_line;
 161             last_line       = new_line;
 162         }
 163         last_line->next = NULL;
 164
 165         graph_string = av_malloc(count + 1);
 166         p = graph_string;
 167         for (line = first_line; line->next; line = line->next) {
 168             unsigned int l = strlen(line->data);
 169             memcpy(p, line->data, l);
 170             p += l;
 171         }
 172         *p = '\0';
 173     }
 174
 175     avfilter_register_all();
 176
 177     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
 178         fprintf(stderr, "Impossible to parse the graph description\n");
 179         return 1;
 180     }
 181
 182     if (avfilter_graph_config(graph, NULL) < 0)
 183         return 1;
 184
 185     print_digraph(outfile, graph);
 186     fflush(outfile);
 187
 188     return 0;
 189 }