mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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* Copyright (c) 2003 Fabrice Bellard
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* Copyright (c) 2007 Michael Niedermayer
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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 <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "libavformat/avformat.h"
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#undef exit
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int main(int argc, char **argv)
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{
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const char *filename;
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AVFormatContext *ic;
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int i, ret, stream_id;
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int64_t timestamp;
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AVFormatParameters params, *ap= ¶ms;
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memset(ap, 0, sizeof(params));
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ap->channels=1;
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ap->sample_rate= 22050;
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/* initialize libavcodec, and register all codecs and formats */
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av_register_all();
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if (argc != 2) {
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printf("usage: %s input_file\n"
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"\n", argv[0]);
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exit(1);
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}
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filename = argv[1];
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/* allocate the media context */
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ic = av_alloc_format_context();
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if (!ic) {
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fprintf(stderr, "Memory error\n");
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exit(1);
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}
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ret = av_open_input_file(&ic, filename, NULL, 0, ap);
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if (ret < 0) {
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fprintf(stderr, "cannot open %s\n", filename);
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exit(1);
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}
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ret = av_find_stream_info(ic);
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if (ret < 0) {
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fprintf(stderr, "%s: could not find codec parameters\n", filename);
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exit(1);
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}
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for(i=0; ; i++){
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AVPacket pkt;
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AVStream *st;
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memset(&pkt, 0, sizeof(pkt));
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if(ret>=0){
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ret= av_read_frame(ic, &pkt);
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printf("ret:%2d", ret);
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if(ret>=0){
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st= ic->streams[pkt.stream_index];
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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);
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}
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printf("\n");
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}
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if(i>25) break;
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stream_id= (i>>1)%(ic->nb_streams+1) - 1;
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timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE;
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if(stream_id>=0){
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st= ic->streams[stream_id];
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timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base);
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}
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ret = av_seek_frame(ic, stream_id, timestamp, (i&1)*AVSEEK_FLAG_BACKWARD);
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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);
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}
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return 0;
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}
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