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 #undef HAVE_AV_CONFIG_H
  24 #include "libavutil/pixdesc.h"
  25 #include "libavutil/audioconvert.h"
  26 #include "libavfilter/avfiltergraph.h"
  27
  28 static void usage(void)
  29 {
  30     printf("Convert a libavfilter graph to a dot file\n");
  31     printf("Usage: graph2dot [OPTIONS]\n");
  32     printf("\n"
  33            "Options:\n"
  34            "-i INFILE         set INFILE as input file, stdin if omitted\n"
  35            "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
  36            "-h                print this help\n");
  37 }
  38
  39 struct line {
  40     char data[256];
  41     struct line *next;
  42 };
  43
  44 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
  45 {
  46     int i, j;
  47
  48     fprintf(outfile, "digraph G {\n");
  49     fprintf(outfile, "node [shape=box]\n");
  50     fprintf(outfile, "rankdir=LR\n");
  51
  52     for (i = 0; i < graph->filter_count; i++) {
  53         char filter_ctx_label[128];
  54         const AVFilterContext *filter_ctx = graph->filters[i];
  55
  56         snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
  57                  filter_ctx->name,
  58                  filter_ctx->filter->name);
  59
  60         for (j = 0; j < filter_ctx->output_count; j++) {
  61             AVFilterLink *link = filter_ctx->outputs[j];
  62             if (link) {
  63                 char dst_filter_ctx_label[128];
  64                 const AVFilterContext *dst_filter_ctx = link->dst;
  65
  66                 snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
  67                          "%s (%s)",
  68                          dst_filter_ctx->name,
  69                          dst_filter_ctx->filter->name);
  70
  71                 fprintf(outfile, "\"%s\" -> \"%s\"",
  72                         filter_ctx_label, dst_filter_ctx_label);
  73                 if (link->type == AVMEDIA_TYPE_VIDEO) {
  74                     fprintf(outfile,
  75                             " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ]",
  76                             av_pix_fmt_descriptors[link->format].name,
  77                             link->w, link->h, link->time_base.num,
  78                             link->time_base.den);
  79                 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
  80                     char buf[255];
  81                     av_get_channel_layout_string(buf, sizeof(buf), -1,
  82                                                  link->channel_layout);
  83                     fprintf(outfile,
  84                             " [ label= \"fmt:%s sr:%"PRId64 " cl:%s\" ]",
  85                             av_get_sample_fmt_name(link->format),
  86                             link->sample_rate, buf);
  87                 }
  88                 fprintf(outfile, ";\n");
  89             }
  90         }
  91     }
  92     fprintf(outfile, "}\n");
  93 }
  94
  95 int main(int argc, char **argv)
  96 {
  97     const char *outfilename = NULL;
  98     const char *infilename  = NULL;
  99     FILE *outfile           = NULL;
 100     FILE *infile            = NULL;
 101     char *graph_string      = NULL;
 102     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
 103     char c;
 104
 105     av_log_set_level(AV_LOG_DEBUG);
 106
 107     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
 108         switch (c) {
 109         case 'h':
 110             usage();
 111             return 0;
 112         case 'i':
 113             infilename = optarg;
 114             break;
 115         case 'o':
 116             outfilename = optarg;
 117             break;
 118         case '?':
 119             return 1;
 120         }
 121     }
 122
 123     if (!infilename || !strcmp(infilename, "-"))
 124         infilename = "/dev/stdin";
 125     infile = fopen(infilename, "r");
 126     if (!infile) {
 127         fprintf(stderr, "Impossible to open input file '%s': %s\n",
 128                 infilename, strerror(errno));
 129         return 1;
 130     }
 131
 132     if (!outfilename || !strcmp(outfilename, "-"))
 133         outfilename = "/dev/stdout";
 134     outfile = fopen(outfilename, "w");
 135     if (!outfile) {
 136         fprintf(stderr, "Impossible to open output file '%s': %s\n",
 137                 outfilename, strerror(errno));
 138         return 1;
 139     }
 140
 141     /* read from infile and put it in a buffer */
 142     {
 143         unsigned int count = 0;
 144         struct line *line, *last_line, *first_line;
 145         char *p;
 146         last_line = first_line = av_malloc(sizeof(struct line));
 147
 148         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
 149             struct line *new_line = av_malloc(sizeof(struct line));
 150             count += strlen(last_line->data);
 151             last_line->next = new_line;
 152             last_line       = new_line;
 153         }
 154         last_line->next = NULL;
 155
 156         graph_string = av_malloc(count + 1);
 157         p = graph_string;
 158         for (line = first_line; line->next; line = line->next) {
 159             unsigned int l = strlen(line->data);
 160             memcpy(p, line->data, l);
 161             p += l;
 162         }
 163         *p = '\0';
 164     }
 165
 166     avfilter_register_all();
 167
 168     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
 169         fprintf(stderr, "Impossible to parse the graph description\n");
 170         return 1;
 171     }
 172
 173     if (avfilter_graph_config(graph, NULL) < 0)
 174         return 1;
 175
 176     print_digraph(outfile, graph);
 177     fflush(outfile);
 178
 179     return 0;
 180 }