1/* 2 * Copyright (c) 2003 Fabrice Bellard 3 * Copyright (c) 2007 Michael Niedermayer 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <stdint.h> 23#include <stdlib.h> 24#include <stdio.h> 25 26#include "libavformat/avformat.h" 27 28#undef exit 29 30int main(int argc, char **argv) 31{ 32 const char *filename; 33 AVFormatContext *ic; 34 int i, ret, stream_id; 35 int64_t timestamp; 36 AVFormatParameters params, *ap= ¶ms; 37 memset(ap, 0, sizeof(params)); 38 ap->channels=1; 39 ap->sample_rate= 22050; 40 41 /* initialize libavcodec, and register all codecs and formats */ 42 av_register_all(); 43 44 if (argc != 2) { 45 printf("usage: %s input_file\n" 46 "\n", argv[0]); 47 exit(1); 48 } 49 50 filename = argv[1]; 51 52 /* allocate the media context */ 53 ic = avformat_alloc_context(); 54 if (!ic) { 55 fprintf(stderr, "Memory error\n"); 56 exit(1); 57 } 58 59 ret = av_open_input_file(&ic, filename, NULL, 0, ap); 60 if (ret < 0) { 61 fprintf(stderr, "cannot open %s\n", filename); 62 exit(1); 63 } 64 65 ret = av_find_stream_info(ic); 66 if (ret < 0) { 67 fprintf(stderr, "%s: could not find codec parameters\n", filename); 68 exit(1); 69 } 70 71 for(i=0; ; i++){ 72 AVPacket pkt; 73 AVStream *st; 74 75 memset(&pkt, 0, sizeof(pkt)); 76 if(ret>=0){ 77 ret= av_read_frame(ic, &pkt); 78 printf("ret:%2d", ret); 79 if(ret>=0){ 80 st= ic->streams[pkt.stream_index]; 81 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); 82 } 83 printf("\n"); 84 } 85 86 if(i>25) break; 87 88 stream_id= (i>>1)%(ic->nb_streams+1) - 1; 89 timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE; 90 if(stream_id>=0){ 91 st= ic->streams[stream_id]; 92 timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base); 93 } 94 ret = av_seek_frame(ic, stream_id, timestamp, (i&1)*AVSEEK_FLAG_BACKWARD); 95 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); 96 } 97 98 return 0; 99} 100