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 <unistd.h>             /* getopt */
  22
  23 #undef HAVE_AV_CONFIG_H
  24 #include "libavutil/pixdesc.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), "%s (%s)",
  66                          dst_filter_ctx->name,
  67                          dst_filter_ctx->filter->name);
  68
  69                 fprintf(outfile, "\"%s\" -> \"%s\"", filter_ctx_label, dst_filter_ctx_label);
  70                 fprintf(outfile, " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ];\n",
  71                         av_pix_fmt_descriptors[link->format].name, link->w, link->h,
  72                         link->time_base.num, link->time_base.den);
  73             }
  74         }
  75     }
  76     fprintf(outfile, "}\n");
  77 }
  78
  79 int main(int argc, char **argv)
  80 {
  81     const char *outfilename = NULL;
  82     const char *infilename = NULL;
  83     FILE *outfile = NULL;
  84     FILE *infile = NULL;
  85     char *graph_string = NULL;
  86     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
  87     char c;
  88
  89     av_log_set_level(AV_LOG_DEBUG);
  90
  91     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
  92         switch(c) {
  93         case 'h':
  94             usage();
  95             return 0;
  96         case 'i':
  97             infilename = optarg;
  98             break;
  99         case 'o':
 100             outfilename = optarg;
 101             break;
 102         case '?':
 103             return 1;
 104         }
 105     }
 106
 107     if (!infilename || !strcmp(infilename, "-"))
 108         infilename = "/dev/stdin";
 109     infile = fopen(infilename, "r");
 110     if (!infile) {
 111         fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
 112         return 1;
 113     }
 114
 115     if (!outfilename || !strcmp(outfilename, "-"))
 116         outfilename = "/dev/stdout";
 117     outfile = fopen(outfilename, "w");
 118     if (!outfile) {
 119         fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
 120         return 1;
 121     }
 122
 123     /* read from infile and put it in a buffer */
 124     {
 125         unsigned int count = 0;
 126         struct line *line, *last_line, *first_line;
 127         char *p;
 128         last_line = first_line = av_malloc(sizeof(struct line));
 129
 130         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
 131             struct line *new_line = av_malloc(sizeof(struct line));
 132             count += strlen(last_line->data);
 133             last_line->next = new_line;
 134             last_line = new_line;
 135         }
 136         last_line->next = NULL;
 137
 138         graph_string = av_malloc(count + 1);
 139         p = graph_string;
 140         for (line = first_line; line->next; line = line->next) {
 141             unsigned int l = strlen(line->data);
 142             memcpy(p, line->data, l);
 143             p += l;
 144         }
 145         *p = '\0';
 146     }
 147
 148     avfilter_register_all();
 149
 150     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
 151         fprintf(stderr, "Impossible to parse the graph description\n");
 152         return 1;
 153     }
 154
 155     if (avfilter_graph_config(graph, NULL) < 0)
 156         return 1;
 157
 158     print_digraph(outfile, graph);
 159     fflush(outfile);
 160
 161     return 0;
 162 }