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avformat/flacdec/flac_read_timestamp: dont modify AVStream state

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-04-15 23:53:31 +02:00
parent 5f4f9ee99f
commit 6d8ccc7ac7
1 changed files with 12 additions and 8 deletions
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20
libavformat/flacdec.c
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@ -167,17 +167,19 @@ static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_inde
{
AVPacket pkt, out_pkt;
AVStream *st = s->streams[stream_index];
AVCodecParserContext *parser;
int ret;
int64_t pts = AV_NOPTS_VALUE;
if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
return AV_NOPTS_VALUE;
av_init_packet(&pkt);
st->parser = av_parser_init(st->codec->codec_id);
if (!st->parser){
parser = av_parser_init(st->codec->codec_id);
if (!parser){
return AV_NOPTS_VALUE;
}
st->parser->flags |= PARSER_FLAG_USE_CODEC_TS;
parser->flags |= PARSER_FLAG_USE_CODEC_TS;
for (;;){
ret = ff_raw_read_partial_packet(s, &pkt);
@ -188,22 +190,24 @@ static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_inde
return AV_NOPTS_VALUE;
}
av_init_packet(&out_pkt);
ret = av_parser_parse2(st->parser, st->codec,
ret = av_parser_parse2(parser, st->codec,
&out_pkt.data, &out_pkt.size, pkt.data, pkt.size,
pkt.pts, pkt.dts, *ppos);
if (out_pkt.size){
int size = out_pkt.size;
av_free_packet(&out_pkt);
if (st->parser->pts != AV_NOPTS_VALUE){
if (parser->pts != AV_NOPTS_VALUE){
// seeking may not have started from beginning of a frame
// calculate frame start position from next frame backwards
*ppos = st->parser->next_frame_offset - size;
return st->parser->pts;
*ppos = parser->next_frame_offset - size;
pts = parser->pts;
break;
}
}
}
return AV_NOPTS_VALUE;
av_parser_close(parser);
return pts;
}
AVInputFormat ff_flac_demuxer = {