mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 03:34:56 +00:00
94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
|
|
* Copyright (c) 2003 Fabrice Bellard
|
|
* Copyright (c) 2007 Michael Niedermayer
|
|
*
|
|
* 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
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
#include "avformat.h"
|
|
|
|
#undef exit
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
const char *filename;
|
|
AVFormatContext *ic;
|
|
int i, ret, stream_id;
|
|
int64_t timestamp;
|
|
|
|
/* initialize libavcodec, and register all codecs and formats */
|
|
av_register_all();
|
|
|
|
if (argc != 2) {
|
|
printf("usage: %s input_file\n"
|
|
"\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
filename = argv[1];
|
|
|
|
/* allocate the media context */
|
|
ic = av_alloc_format_context();
|
|
if (!ic) {
|
|
fprintf(stderr, "Memory error\n");
|
|
exit(1);
|
|
}
|
|
|
|
ret = av_open_input_file(&ic, filename, NULL, 0, NULL);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "cannot open %s\n", filename);
|
|
exit(1);
|
|
}
|
|
|
|
ret = av_find_stream_info(ic);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "%s: could not find codec parameters\n", filename);
|
|
exit(1);
|
|
}
|
|
|
|
for(i=0; ; i++){
|
|
AVPacket pkt;
|
|
AVStream *st;
|
|
|
|
memset(&pkt, 0, sizeof(pkt));
|
|
if(ret>=0){
|
|
ret= av_read_frame(ic, &pkt);
|
|
printf("ret:%2d", ret);
|
|
if(ret>=0){
|
|
st= ic->streams[pkt.stream_index];
|
|
printf(" st:%2d dts:%f pts:%f pos:%" PRId64 " size:%d flags:%d", pkt.stream_index, pkt.dts*av_q2d(st->time_base), pkt.pts*av_q2d(st->time_base), pkt.pos, pkt.size, pkt.flags);
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
if(i>25) break;
|
|
|
|
stream_id= (i>>1)%(ic->nb_streams+1) - 1;
|
|
timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE;
|
|
if(stream_id>=0){
|
|
st= ic->streams[stream_id];
|
|
timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base);
|
|
}
|
|
ret = av_seek_frame(ic, stream_id, timestamp, (i&1)*AVSEEK_FLAG_BACKWARD);
|
|
printf("ret:%2d st:%2d ts:%f flags:%d\n", ret, stream_id, timestamp*(stream_id<0 ? 1.0/AV_TIME_BASE : av_q2d(st->time_base)), i&1);
|
|
}
|
|
|
|
return 0;
|
|
}
|