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tools/graph2dot.c

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00001 /*
00002  * Copyright (c) 2008-2010 Stefano Sabatini
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include <unistd.h>             /* getopt */
00022 
00023 #undef HAVE_AV_CONFIG_H
00024 #include "libavutil/pixdesc.h"
00025 #include "libavfilter/graphparser.h"
00026 
00027 static void usage(void)
00028 {
00029     printf("Convert a libavfilter graph to a dot file\n");
00030     printf("Usage: graph2dot [OPTIONS]\n");
00031     printf("\n"
00032            "Options:\n"
00033            "-i INFILE         set INFILE as input file, stdin if omitted\n"
00034            "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
00035            "-h                print this help\n");
00036 }
00037 
00038 struct line {
00039     char data[256];
00040     struct line *next;
00041 };
00042 
00043 static void print_digraph(FILE *outfile, AVFilterGraph *graph)
00044 {
00045     int i, j;
00046 
00047     fprintf(outfile, "digraph G {\n");
00048     fprintf(outfile, "node [shape=box]\n");
00049     fprintf(outfile, "rankdir=LR\n");
00050 
00051     for (i = 0; i < graph->filter_count; i++) {
00052         char filter_ctx_label[128];
00053         const AVFilterContext *filter_ctx = graph->filters[i];
00054 
00055         snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
00056                  filter_ctx->name,
00057                  filter_ctx->filter->name);
00058 
00059         for (j = 0; j < filter_ctx->output_count; j++) {
00060             AVFilterLink *link = filter_ctx->outputs[j];
00061             if (link) {
00062                 char dst_filter_ctx_label[128];
00063                 const AVFilterContext *dst_filter_ctx = link->dst;
00064 
00065                 snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label), "%s (%s)",
00066                          dst_filter_ctx->name,
00067                          dst_filter_ctx->filter->name);
00068 
00069                 fprintf(outfile, "\"%s\" -> \"%s\"", filter_ctx_label, dst_filter_ctx_label);
00070                 fprintf(outfile, " [ label= \"fmt:%s w:%d h:%d\"];\n",
00071                         av_pix_fmt_descriptors[link->format].name, link->w, link->h);
00072             }
00073         }
00074     }
00075     fprintf(outfile, "}\n");
00076 }
00077 
00078 int main(int argc, char **argv)
00079 {
00080     const char *outfilename = NULL;
00081     const char *infilename = NULL;
00082     FILE *outfile = NULL;
00083     FILE *infile = NULL;
00084     char *graph_string = NULL;
00085     AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
00086     char c;
00087 
00088     av_log_set_level(AV_LOG_DEBUG);
00089 
00090     while ((c = getopt(argc, argv, "hi:o:")) != -1) {
00091         switch(c) {
00092         case 'h':
00093             usage();
00094             return 0;
00095         case 'i':
00096             infilename = optarg;
00097             break;
00098         case 'o':
00099             outfilename = optarg;
00100             break;
00101         case '?':
00102             return 1;
00103         }
00104     }
00105 
00106     if (!infilename || !strcmp(infilename, "-"))
00107         infilename = "/dev/stdin";
00108     infile = fopen(infilename, "r");
00109     if (!infile) {
00110         fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
00111         return 1;
00112     }
00113 
00114     if (!outfilename || !strcmp(outfilename, "-"))
00115         outfilename = "/dev/stdout";
00116     outfile = fopen(outfilename, "w");
00117     if (!outfile) {
00118         fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
00119         return 1;
00120     }
00121 
00122     /* read from infile and put it in a buffer */
00123     {
00124         unsigned int count = 0;
00125         struct line *line, *last_line, *first_line;
00126         char *p;
00127         last_line = first_line = av_malloc(sizeof(struct line));
00128 
00129         while (fgets(last_line->data, sizeof(last_line->data), infile)) {
00130             struct line *new_line = av_malloc(sizeof(struct line));
00131             count += strlen(last_line->data);
00132             last_line->next = new_line;
00133             last_line = new_line;
00134         }
00135         last_line->next = NULL;
00136 
00137         graph_string = av_malloc(count + 1);
00138         p = graph_string;
00139         for (line = first_line; line->next; line = line->next) {
00140             unsigned int l = strlen(line->data);
00141             memcpy(p, line->data, l);
00142             p += l;
00143         }
00144         *p = '\0';
00145     }
00146 
00147     avfilter_register_all();
00148 
00149     if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
00150         fprintf(stderr, "Impossible to parse the graph description\n");
00151         return 1;
00152     }
00153 
00154     if (avfilter_graph_check_validity(graph, NULL) ||
00155         avfilter_graph_config_formats(graph, NULL) ||
00156         avfilter_graph_config_links  (graph, NULL))
00157         return 1;
00158 
00159     print_digraph(outfile, graph);
00160     fflush(outfile);
00161 
00162     return 0;
00163 }

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