tests/seek_test.c

   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
  30 int 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 = av_alloc_format_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 }