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/graphparser.h"
26
27static 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
38struct line {
39    char data[256];
40    struct line *next;
41};
42
43static 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\"];\n",
71                        av_pix_fmt_descriptors[link->format].name, link->w, link->h);
72            }
73        }
74    }
75    fprintf(outfile, "}\n");
76}
77
78int main(int argc, char **argv)
79{
80    const char *outfilename = NULL;
81    const char *infilename = NULL;
82    FILE *outfile = NULL;
83    FILE *infile = NULL;
84    char *graph_string = NULL;
85    AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
86    char c;
87
88    av_log_set_level(AV_LOG_DEBUG);
89
90    while ((c = getopt(argc, argv, "hi:o:")) != -1) {
91        switch(c) {
92        case 'h':
93            usage();
94            return 0;
95        case 'i':
96            infilename = optarg;
97            break;
98        case 'o':
99            outfilename = optarg;
100            break;
101        case '?':
102            return 1;
103        }
104    }
105
106    if (!infilename || !strcmp(infilename, "-"))
107        infilename = "/dev/stdin";
108    infile = fopen(infilename, "r");
109    if (!infile) {
110        fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
111        return 1;
112    }
113
114    if (!outfilename || !strcmp(outfilename, "-"))
115        outfilename = "/dev/stdout";
116    outfile = fopen(outfilename, "w");
117    if (!outfile) {
118        fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
119        return 1;
120    }
121
122    /* read from infile and put it in a buffer */
123    {
124        unsigned int count = 0;
125        struct line *line, *last_line, *first_line;
126        char *p;
127        last_line = first_line = av_malloc(sizeof(struct line));
128
129        while (fgets(last_line->data, sizeof(last_line->data), infile)) {
130            struct line *new_line = av_malloc(sizeof(struct line));
131            count += strlen(last_line->data);
132            last_line->next = new_line;
133            last_line = new_line;
134        }
135        last_line->next = NULL;
136
137        graph_string = av_malloc(count + 1);
138        p = graph_string;
139        for (line = first_line; line->next; line = line->next) {
140            unsigned int l = strlen(line->data);
141            memcpy(p, line->data, l);
142            p += l;
143        }
144        *p = '\0';
145    }
146
147    avfilter_register_all();
148
149    if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
150        fprintf(stderr, "Impossible to parse the graph description\n");
151        return 1;
152    }
153
154    if (avfilter_graph_check_validity(graph, NULL) ||
155        avfilter_graph_config_formats(graph, NULL) ||
156        avfilter_graph_config_links  (graph, NULL))
157        return 1;
158
159    print_digraph(outfile, graph);
160    fflush(outfile);
161
162    return 0;
163}
164