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
28static 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
39struct line {
40    char data[256];
41    struct line *next;
42};
43
44static 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), "%s (%s)",
67                         dst_filter_ctx->name,
68                         dst_filter_ctx->filter->name);
69
70                fprintf(outfile, "\"%s\" -> \"%s\"", filter_ctx_label, dst_filter_ctx_label);
71                if (link->type == AVMEDIA_TYPE_VIDEO) {
72                    fprintf(outfile, " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ]",
73                            av_pix_fmt_descriptors[link->format].name,
74                            link->w, link->h, link->time_base.num, link->time_base.den);
75                } else if (link->type == AVMEDIA_TYPE_AUDIO) {
76                    char buf[255];
77                    av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
78                    fprintf(outfile, " [ label= \"fmt:%s sr:%"PRId64" cl:%s\" ]",
79                            av_get_sample_fmt_name(link->format),
80                            link->sample_rate, buf);
81                }
82                fprintf(outfile, ";\n");
83            }
84        }
85    }
86    fprintf(outfile, "}\n");
87}
88
89int main(int argc, char **argv)
90{
91    const char *outfilename = NULL;
92    const char *infilename = NULL;
93    FILE *outfile = NULL;
94    FILE *infile = NULL;
95    char *graph_string = NULL;
96    AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
97    char c;
98
99    av_log_set_level(AV_LOG_DEBUG);
100
101    while ((c = getopt(argc, argv, "hi:o:")) != -1) {
102        switch(c) {
103        case 'h':
104            usage();
105            return 0;
106        case 'i':
107            infilename = optarg;
108            break;
109        case 'o':
110            outfilename = optarg;
111            break;
112        case '?':
113            return 1;
114        }
115    }
116
117    if (!infilename || !strcmp(infilename, "-"))
118        infilename = "/dev/stdin";
119    infile = fopen(infilename, "r");
120    if (!infile) {
121        fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
122        return 1;
123    }
124
125    if (!outfilename || !strcmp(outfilename, "-"))
126        outfilename = "/dev/stdout";
127    outfile = fopen(outfilename, "w");
128    if (!outfile) {
129        fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
130        return 1;
131    }
132
133    /* read from infile and put it in a buffer */
134    {
135        unsigned int count = 0;
136        struct line *line, *last_line, *first_line;
137        char *p;
138        last_line = first_line = av_malloc(sizeof(struct line));
139
140        while (fgets(last_line->data, sizeof(last_line->data), infile)) {
141            struct line *new_line = av_malloc(sizeof(struct line));
142            count += strlen(last_line->data);
143            last_line->next = new_line;
144            last_line = new_line;
145        }
146        last_line->next = NULL;
147
148        graph_string = av_malloc(count + 1);
149        p = graph_string;
150        for (line = first_line; line->next; line = line->next) {
151            unsigned int l = strlen(line->data);
152            memcpy(p, line->data, l);
153            p += l;
154        }
155        *p = '\0';
156    }
157
158    avfilter_register_all();
159
160    if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
161        fprintf(stderr, "Impossible to parse the graph description\n");
162        return 1;
163    }
164
165    if (avfilter_graph_config(graph, NULL) < 0)
166        return 1;
167
168    print_digraph(outfile, graph);
169    fflush(outfile);
170
171    return 0;
172}
173