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= &params;
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