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ffmpeg / tests / seek_test.c @ 953f54f1

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/*
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 * Copyright (c) 2003 Fabrice Bellard
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 * Copyright (c) 2007 Michael Niedermayer
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "avformat.h"
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#undef exit
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int main(int argc, char **argv)
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{
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    const char *filename;
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    AVFormatContext *ic;
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    int i, ret, stream_id;
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    int64_t timestamp;
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    AVFormatParameters params, *ap= &params;
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    memset(ap, 0, sizeof(params));
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    ap->channels=1;
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    ap->sample_rate= 22050;
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    /* initialize libavcodec, and register all codecs and formats */
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    av_register_all();
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    if (argc != 2) {
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        printf("usage: %s input_file\n"
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               "\n", argv[0]);
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        exit(1);
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    }
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    filename = argv[1];
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    /* allocate the media context */
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    ic = av_alloc_format_context();
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    if (!ic) {
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        fprintf(stderr, "Memory error\n");
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        exit(1);
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    }
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    ret = av_open_input_file(&ic, filename, NULL, 0, ap);
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    if (ret < 0) {
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        fprintf(stderr, "cannot open %s\n", filename);
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        exit(1);
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    }
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    ret = av_find_stream_info(ic);
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    if (ret < 0) {
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        fprintf(stderr, "%s: could not find codec parameters\n", filename);
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        exit(1);
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    }
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    for(i=0; ; i++){
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        AVPacket pkt;
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        AVStream *st;
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        memset(&pkt, 0, sizeof(pkt));
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        if(ret>=0){
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            ret= av_read_frame(ic, &pkt);
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            printf("ret:%2d", ret);
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            if(ret>=0){
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                st= ic->streams[pkt.stream_index];
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                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);
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            }
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            printf("\n");
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        }
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        if(i>25) break;
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        stream_id= (i>>1)%(ic->nb_streams+1) - 1;
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        timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE;
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        if(stream_id>=0){
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            st= ic->streams[stream_id];
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            timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base);
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        }
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        ret = av_seek_frame(ic, stream_id, timestamp, (i&1)*AVSEEK_FLAG_BACKWARD);
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        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);
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    }
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    return 0;
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}