pktdumper.c 3.93 KB
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/*
 * Copyright (c) 2005 Francois Revol
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#include <limits.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

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#include "libavformat/avformat.h"
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#define PKTFILESUFF "_%08" PRId64 "_%02d_%010" PRId64 "_%06d_%c.bin"
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static int usage(int ret)
{
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    fprintf(stderr, "dump (up to maxpkts) AVPackets as they are demuxed by libavformat.\n");
    fprintf(stderr, "each packet is dumped in its own file named like `basename file.ext`_$PKTNUM_$STREAMINDEX_$STAMP_$SIZE_$FLAGS.bin\n");
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    fprintf(stderr, "pktdumper [-nw] file [maxpkts]\n");
    fprintf(stderr, "-n\twrite No file at all, only demux.\n");
    fprintf(stderr, "-w\tWait at end of processing instead of quitting.\n");
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    return ret;
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}

int main(int argc, char **argv)
{
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    char fntemplate[PATH_MAX];
    char pktfilename[PATH_MAX];
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    AVFormatContext *fctx = NULL;
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    AVPacket pkt;
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    int64_t pktnum  = 0;
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    int64_t maxpkts = 0;
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    int donotquit   = 0;
    int nowrite     = 0;
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    int err;
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    if ((argc > 1) && !strncmp(argv[1], "-", 1)) {
        if (strchr(argv[1], 'w'))
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            donotquit = 1;
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        if (strchr(argv[1], 'n'))
            nowrite = 1;
        argv++;
        argc--;
    }
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    if (argc < 2)
        return usage(1);
    if (argc > 2)
        maxpkts = atoi(argv[2]);
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    strncpy(fntemplate, argv[1], PATH_MAX - 1);
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    if (strrchr(argv[1], '/'))
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        strncpy(fntemplate, strrchr(argv[1], '/') + 1, PATH_MAX - 1);
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    if (strrchr(fntemplate, '.'))
        *strrchr(fntemplate, '.') = '\0';
    if (strchr(fntemplate, '%')) {
        fprintf(stderr, "can't use filenames containing '%%'\n");
        return usage(1);
    }
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    if (strlen(fntemplate) + sizeof(PKTFILESUFF) >= PATH_MAX - 1) {
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        fprintf(stderr, "filename too long\n");
        return usage(1);
    }
    strcat(fntemplate, PKTFILESUFF);
    printf("FNTEMPLATE: '%s'\n", fntemplate);
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    // register all file formats
    av_register_all();
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    err = avformat_open_input(&fctx, argv[1], NULL, NULL);
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    if (err < 0) {
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        fprintf(stderr, "cannot open input: error %d\n", err);
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        return 1;
    }
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    err = avformat_find_stream_info(fctx, NULL);
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    if (err < 0) {
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        fprintf(stderr, "avformat_find_stream_info: error %d\n", err);
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        return 1;
    }
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    av_init_packet(&pkt);
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    while ((err = av_read_frame(fctx, &pkt)) >= 0) {
        int fd;
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        snprintf(pktfilename, PATH_MAX - 1, fntemplate, pktnum,
                 pkt.stream_index, pkt.pts, pkt.size,
                 (pkt.flags & AV_PKT_FLAG_KEY) ? 'K' : '_');
        printf(PKTFILESUFF "\n", pktnum, pkt.stream_index, pkt.pts, pkt.size,
               (pkt.flags & AV_PKT_FLAG_KEY) ? 'K' : '_');
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        //printf("open(\"%s\")\n", pktfilename);
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        if (!nowrite) {
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            fd  = open(pktfilename, O_WRONLY | O_CREAT, 0644);
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            err = write(fd, pkt.data, pkt.size);
            if (err < 0) {
                fprintf(stderr, "write: error %d\n", err);
                return 1;
            }
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            close(fd);
        }
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        av_free_packet(&pkt);
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        pktnum++;
        if (maxpkts && (pktnum >= maxpkts))
            break;
    }
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    avformat_close_input(&fctx);
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    while (donotquit)
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        usleep(60 * 1000000);
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    return 0;
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}