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 #include <stdlib.h>
  22 #include <stdio.h>
  23
  24 #include "avformat.h"
  25
  26 #undef exit
  27
  28 int main(int argc, char **argv)
  29 {
  30     const char *filename;
  31     AVFormatContext *ic;
  32     int i, ret, stream_id;
  33     int64_t timestamp;
  34     AVFormatParameters params, *ap= &params;
  35     memset(ap, 0, sizeof(params));
  36     ap->channels=1;
  37     ap->sample_rate= 22050;
  38
  39     /* initialize libavcodec, and register all codecs and formats */
  40     av_register_all();
  41
  42     if (argc != 2) {
  43         printf("usage: %s input_file\n"
  44                "\n", argv[0]);
  45         exit(1);
  46     }
  47
  48     filename = argv[1];
  49
  50     /* allocate the media context */
  51     ic = av_alloc_format_context();
  52     if (!ic) {
  53         fprintf(stderr, "Memory error\n");
  54         exit(1);
  55     }
  56
  57     ret = av_open_input_file(&ic, filename, NULL, 0, ap);
  58     if (ret < 0) {
  59         fprintf(stderr, "cannot open %s\n", filename);
  60         exit(1);
  61     }
  62
  63     ret = av_find_stream_info(ic);
  64     if (ret < 0) {
  65         fprintf(stderr, "%s: could not find codec parameters\n", filename);
  66         exit(1);
  67     }
  68
  69     for(i=0; ; i++){
  70         AVPacket pkt;
  71         AVStream *st;
  72
  73         memset(&pkt, 0, sizeof(pkt));
  74         if(ret>=0){
  75             ret= av_read_frame(ic, &pkt);
  76             printf("ret:%2d", ret);
  77             if(ret>=0){
  78                 st= ic->streams[pkt.stream_index];
  79                 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);
  80             }
  81             printf("\n");
  82         }
  83
  84         if(i>25) break;
  85
  86         stream_id= (i>>1)%(ic->nb_streams+1) - 1;
  87         timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE;
  88         if(stream_id>=0){
  89             st= ic->streams[stream_id];
  90             timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base);
  91         }
  92         ret = av_seek_frame(ic, stream_id, timestamp, (i&1)*AVSEEK_FLAG_BACKWARD);
  93         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);
  94     }
  95
  96     return 0;
  97 }