2 * Copyright (c) 2003 Fabrice Bellard
3 * Copyright (c) 2007 Michael Niedermayer
5 * This file is part of FFmpeg.
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.
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.
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
26 #include "libavformat/avformat.h"
30 int main(int argc, char **argv)
34 int i, ret, stream_id;
36 AVFormatParameters params, *ap= ¶ms;
37 memset(ap, 0, sizeof(params));
39 ap->sample_rate= 22050;
41 /* initialize libavcodec, and register all codecs and formats */
45 printf("usage: %s input_file\n"
52 /* allocate the media context */
53 ic = avformat_alloc_context();
55 fprintf(stderr, "Memory error\n");
59 ret = av_open_input_file(&ic, filename, NULL, 0, ap);
61 fprintf(stderr, "cannot open %s\n", filename);
65 ret = av_find_stream_info(ic);
67 fprintf(stderr, "%s: could not find codec parameters\n", filename);
75 memset(&pkt, 0, sizeof(pkt));
77 ret= av_read_frame(ic, &pkt);
78 printf("ret:%2d", ret);
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);
88 stream_id= (i>>1)%(ic->nb_streams+1) - 1;
89 timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE;
91 st= ic->streams[stream_id];
92 timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base);
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);