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ffmpeg / tools / graph2dot.c @ b382d1e3

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/*
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 * Copyright (c) 2008-2010 Stefano Sabatini
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <unistd.h>             /* getopt */
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#undef HAVE_AV_CONFIG_H
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#include "libavutil/pixdesc.h"
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#include "libavfilter/avfiltergraph.h"
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static void usage(void)
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{
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    printf("Convert a libavfilter graph to a dot file\n");
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    printf("Usage: graph2dot [OPTIONS]\n");
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    printf("\n"
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           "Options:\n"
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           "-i INFILE         set INFILE as input file, stdin if omitted\n"
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           "-o OUTFILE        set OUTFILE as output file, stdout if omitted\n"
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           "-h                print this help\n");
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}
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struct line {
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    char data[256];
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    struct line *next;
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};
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static void print_digraph(FILE *outfile, AVFilterGraph *graph)
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{
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    int i, j;
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    fprintf(outfile, "digraph G {\n");
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    fprintf(outfile, "node [shape=box]\n");
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    fprintf(outfile, "rankdir=LR\n");
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    for (i = 0; i < graph->filter_count; i++) {
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        char filter_ctx_label[128];
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        const AVFilterContext *filter_ctx = graph->filters[i];
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        snprintf(filter_ctx_label, sizeof(filter_ctx_label), "%s (%s)",
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                 filter_ctx->name,
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                 filter_ctx->filter->name);
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        for (j = 0; j < filter_ctx->output_count; j++) {
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            AVFilterLink *link = filter_ctx->outputs[j];
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            if (link) {
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                char dst_filter_ctx_label[128];
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                const AVFilterContext *dst_filter_ctx = link->dst;
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                snprintf(dst_filter_ctx_label, sizeof(dst_filter_ctx_label), "%s (%s)",
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                         dst_filter_ctx->name,
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                         dst_filter_ctx->filter->name);
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                fprintf(outfile, "\"%s\" -> \"%s\"", filter_ctx_label, dst_filter_ctx_label);
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                fprintf(outfile, " [ label= \"fmt:%s w:%d h:%d tb:%d/%d\" ];\n",
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                        link->type == AVMEDIA_TYPE_VIDEO ? av_pix_fmt_descriptors[link->format].name :
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                        link->type == AVMEDIA_TYPE_AUDIO ? av_get_sample_fmt_name(link->format) : "unknown",
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                        link->w, link->h, link->time_base.num, link->time_base.den);
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            }
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        }
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    }
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    fprintf(outfile, "}\n");
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}
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int main(int argc, char **argv)
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{
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    const char *outfilename = NULL;
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    const char *infilename = NULL;
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    FILE *outfile = NULL;
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    FILE *infile = NULL;
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    char *graph_string = NULL;
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    AVFilterGraph *graph = av_mallocz(sizeof(AVFilterGraph));
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    char c;
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    av_log_set_level(AV_LOG_DEBUG);
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    while ((c = getopt(argc, argv, "hi:o:")) != -1) {
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        switch(c) {
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        case 'h':
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            usage();
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            return 0;
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        case 'i':
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            infilename = optarg;
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            break;
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        case 'o':
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            outfilename = optarg;
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            break;
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        case '?':
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            return 1;
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        }
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    }
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    if (!infilename || !strcmp(infilename, "-"))
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        infilename = "/dev/stdin";
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    infile = fopen(infilename, "r");
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    if (!infile) {
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        fprintf(stderr, "Impossible to open input file '%s': %s\n", infilename, strerror(errno));
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        return 1;
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    }
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    if (!outfilename || !strcmp(outfilename, "-"))
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        outfilename = "/dev/stdout";
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    outfile = fopen(outfilename, "w");
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    if (!outfile) {
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        fprintf(stderr, "Impossible to open output file '%s': %s\n", outfilename, strerror(errno));
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        return 1;
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    }
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    /* read from infile and put it in a buffer */
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    {
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        unsigned int count = 0;
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        struct line *line, *last_line, *first_line;
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        char *p;
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        last_line = first_line = av_malloc(sizeof(struct line));
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        while (fgets(last_line->data, sizeof(last_line->data), infile)) {
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            struct line *new_line = av_malloc(sizeof(struct line));
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            count += strlen(last_line->data);
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            last_line->next = new_line;
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            last_line = new_line;
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        }
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        last_line->next = NULL;
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        graph_string = av_malloc(count + 1);
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        p = graph_string;
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        for (line = first_line; line->next; line = line->next) {
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            unsigned int l = strlen(line->data);
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            memcpy(p, line->data, l);
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            p += l;
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        }
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        *p = '\0';
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    }
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    avfilter_register_all();
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    if (avfilter_graph_parse(graph, graph_string, NULL, NULL, NULL) < 0) {
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        fprintf(stderr, "Impossible to parse the graph description\n");
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        return 1;
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    }
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    if (avfilter_graph_config(graph, NULL) < 0)
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        return 1;
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    print_digraph(outfile, graph);
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    fflush(outfile);
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    return 0;
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}