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 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "libavutil/mem.h"
  26 #include "libavutil/pixdesc.h"
  27 #include "libavutil/audioconvert.h"
  28 #include "libavfilter/avfiltergraph.h"
  29
  30 static void usage(void)
  31 {
  32     printf("Convert a libavfilter graph to a dot file\n");
  33     printf("Usage: graph2dot [OPTIONS]\n");
  34     printf("\n"
  35            "Options:\n"
  36            "-i INFILE         set INFILE as input file, stdin if omitted\n"
  37            "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
  38            "-h                print this help\n");
  39 }
  40
  41 struct line {
  42     char data[256];
  43     struct line *next;
  44 };
  45
  46 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
  47 {
  48     int i, j;
  49
  50     fprintf(outfile, "digraph G {\n");
  51     fprintf(outfile, "node [shape=box]\n");
  52     fprintf(outfile, "rankdir=LR\n");
  53
  54     for (i = 0; i < graph->filter_count; i++) {
  55         char filter_ctx_label[128];
  56         const AVFilterContext *filter_ctx = graph->filters[i];
  57
  58         snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
  59                  filter_ctx->name,
  60                  filter_ctx->filter->name);
  61
  62         for (j = 0; j < filter_ctx->output_count; j++) {
  63             AVFilterLink *link = filter_ctx->outputs[j];
  64             if (link) {
  65                 char dst_filter_ctx_label[128];
  66                 const AVFilterContext *dst_filter_ctx = link->dst;
  67
  68                 snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
  69                          "%s (%s)",
  70                          dst_filter_ctx->name,
  71                          dst_filter_ctx->filter->name);
  72
  73                 fprintf(outfile, "\"%s\" -> \"%s\"",
  74                         filter_ctx_label, dst_filter_ctx_label);
  75                 if (link->type == AVMEDIA_TYPE_VIDEO) {
  76                     fprintf(outfile,
  77                             " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ]",
  78                             av_pix_fmt_descriptors[link->format].name,
  79                             link->w, link->h, link->time_base.num,
  80                             link->time_base.den);
  81                 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
  82                     char buf[255];
  83                     av_get_channel_layout_string(buf, sizeof(buf), -1,
  84                                                  link->channel_layout);
  85                     fprintf(outfile,
  86                             " [ label= \"fmt:%s sr:%d cl:%s\" ]",
  87                             av_get_sample_fmt_name(link->format),
  88                             link->sample_rate, buf);
  89                 }
  90                 fprintf(outfile, ";\n");
  91             }
  92         }
  93     }
  94     fprintf(outfile, "}\n");
  95 }
  96
  97 int main(int argc, char **argv)
  98 {
  99     const char *outfilename = NULL;
 100     const char *infilename  = NULL;
 101     FILE *outfile           = NULL;
 102     FILE *infile            = NULL;
 103     char *graph_string      = NULL;
 104     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
 105     char c;
 106
 107     av_log_set_level(AV_LOG_DEBUG);
 108
 109     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
 110         switch (c) {
 111         case 'h':
 112             usage();
 113             return 0;
 114         case 'i':
 115             infilename = optarg;
 116             break;
 117         case 'o':
 118             outfilename = optarg;
 119             break;
 120         case '?':
 121             return 1;
 122         }
 123     }
 124
 125     if (!infilename || !strcmp(infilename, "-"))
 126         infilename = "/dev/stdin";
 127     infile = fopen(infilename, "r");
 128     if (!infile) {
 129         fprintf(stderr, "Impossible to open input file '%s': %s\n",
 130                 infilename, strerror(errno));
 131         return 1;
 132     }
 133
 134     if (!outfilename || !strcmp(outfilename, "-"))
 135         outfilename = "/dev/stdout";
 136     outfile = fopen(outfilename, "w");
 137     if (!outfile) {
 138         fprintf(stderr, "Impossible to open output file '%s': %s\n",
 139                 outfilename, strerror(errno));
 140         return 1;
 141     }
 142
 143     /* read from infile and put it in a buffer */
 144     {
 145         unsigned int count = 0;
 146         struct line *line, *last_line, *first_line;
 147         char *p;
 148         last_line = first_line = av_malloc(sizeof(struct line));
 149
 150         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
 151             struct line *new_line = av_malloc(sizeof(struct line));
 152             count += strlen(last_line->data);
 153             last_line->next = new_line;
 154             last_line       = new_line;
 155         }
 156         last_line->next = NULL;
 157
 158         graph_string = av_malloc(count + 1);
 159         p = graph_string;
 160         for (line = first_line; line->next; line = line->next) {
 161             unsigned int l = strlen(line->data);
 162             memcpy(p, line->data, l);
 163             p += l;
 164         }
 165         *p = '\0';
 166     }
 167
 168     avfilter_register_all();
 169
 170     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
 171         fprintf(stderr, "Impossible to parse the graph description\n");
 172         return 1;
 173     }
 174
 175     if (avfilter_graph_config(graph, NULL) < 0)
 176         return 1;
 177
 178     print_digraph(outfile, graph);
 179     fflush(outfile);
 180
 181     return 0;
 182 }