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 "config.h"
22#if HAVE_UNISTD_H
23#include <unistd.h>             /* getopt */
24#endif
25#include <stdio.h>
26#include <string.h>
27
28#include "libavutil/channel_layout.h"
29#include "libavutil/mem.h"
30#include "libavutil/pixdesc.h"
31#include "libavfilter/avfilter.h"
32
33#if !HAVE_GETOPT
34#include "compat/getopt.c"
35#endif
36
37static void usage(void)
38{
39    printf("Convert a libavfilter graph to a dot file.\n");
40    printf("Usage: graph2dot [OPTIONS]\n");
41    printf("\n"
42           "Options:\n"
43           "-i INFILE         set INFILE as input file, stdin if omitted\n"
44           "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
45           "-h                print this help\n");
46}
47
48struct line {
49    char data[256];
50    struct line *next;
51};
52
53static void print_digraph(FILE *outfile, AVFilterGraph *graph)
54{
55    int i, j;
56
57    fprintf(outfile, "digraph G {\n");
58    fprintf(outfile, "node [shape=box]\n");
59    fprintf(outfile, "rankdir=LR\n");
60
61    for (i = 0; i < graph->nb_filters; i++) {
62        char filter_ctx_label[128];
63        const AVFilterContext *filter_ctx = graph->filters[i];
64
65        snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s\\n(%s)",
66                 filter_ctx->name,
67                 filter_ctx->filter->name);
68
69        for (j = 0; j < filter_ctx->nb_outputs; j++) {
70            AVFilterLink *link = filter_ctx->outputs[j];
71            if (link) {
72                char dst_filter_ctx_label[128];
73                const AVFilterContext *dst_filter_ctx = link->dst;
74
75                snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label),
76                         "%s\\n(%s)",
77                         dst_filter_ctx->name,
78                         dst_filter_ctx->filter->name);
79
80                fprintf(outfile, "\"%s\" -> \"%s\" [ label= \"inpad:%s -> outpad:%s\\n",
81                        filter_ctx_label, dst_filter_ctx_label,
82                        link->srcpad->name, link->dstpad->name);
83
84                if (link->type == AVMEDIA_TYPE_VIDEO) {
85                    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
86                    fprintf(outfile,
87                            "fmt:%s w:%d h:%d tb:%d/%d",
88                            desc->name,
89                            link->w, link->h,
90                            link->time_base.num, link->time_base.den);
91                } else if (link->type == AVMEDIA_TYPE_AUDIO) {
92                    char buf[255];
93                    av_get_channel_layout_string(buf, sizeof(buf), -1,
94                                                 link->channel_layout);
95                    fprintf(outfile,
96                            "fmt:%s sr:%d cl:%s tb:%d/%d",
97                            av_get_sample_fmt_name(link->format),
98                            link->sample_rate, buf,
99                            link->time_base.num, link->time_base.den);
100                }
101                fprintf(outfile, "\" ];\n");
102            }
103        }
104    }
105    fprintf(outfile, "}\n");
106}
107
108int main(int argc, char **argv)
109{
110    const char *outfilename = NULL;
111    const char *infilename  = NULL;
112    FILE *outfile           = NULL;
113    FILE *infile            = NULL;
114    char *graph_string      = NULL;
115    AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
116    char c;
117
118    av_log_set_level(AV_LOG_DEBUG);
119
120    while ((c = getopt(argc, argv, "hi:o:")) != -1) {
121        switch (c) {
122        case 'h':
123            usage();
124            return 0;
125        case 'i':
126            infilename = optarg;
127            break;
128        case 'o':
129            outfilename = optarg;
130            break;
131        case '?':
132            return 1;
133        }
134    }
135
136    if (!infilename || !strcmp(infilename, "-"))
137        infilename = "/dev/stdin";
138    infile = fopen(infilename, "r");
139    if (!infile) {
140        fprintf(stderr, "Failed to open input file '%s': %s\n",
141                infilename, strerror(errno));
142        return 1;
143    }
144
145    if (!outfilename || !strcmp(outfilename, "-"))
146        outfilename = "/dev/stdout";
147    outfile = fopen(outfilename, "w");
148    if (!outfile) {
149        fprintf(stderr, "Failed to open output file '%s': %s\n",
150                outfilename, strerror(errno));
151        return 1;
152    }
153
154    /* read from infile and put it in a buffer */
155    {
156        unsigned int count = 0;
157        struct line *line, *last_line, *first_line;
158        char *p;
159        last_line = first_line = av_malloc(sizeof(struct line));
160
161        while (fgets(last_line->data, sizeof(last_line->data), infile)) {
162            struct line *new_line = av_malloc(sizeof(struct line));
163            count += strlen(last_line->data);
164            last_line->next = new_line;
165            last_line       = new_line;
166        }
167        last_line->next = NULL;
168
169        graph_string = av_malloc(count + 1);
170        p = graph_string;
171        for (line = first_line; line->next; line = line->next) {
172            unsigned int l = strlen(line->data);
173            memcpy(p, line->data, l);
174            p += l;
175        }
176        *p = '\0';
177    }
178
179    avfilter_register_all();
180
181    if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
182        fprintf(stderr, "Failed to parse the graph description\n");
183        return 1;
184    }
185
186    if (avfilter_graph_config(graph, NULL) < 0)
187        return 1;
188
189    print_digraph(outfile, graph);
190    fflush(outfile);
191
192    return 0;
193}
194