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vorbisdec: read the previous window flag for long windows

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When reading sequentially, we are using the actual flag from the previous
frame, but when seeking we do not know what the previous window flag was, so
we need to read it from the bitstream.
This commit is contained in:
Justin Ruggles 2012-02-24 18:04:05 -05:00
parent 7fb6c9225c
commit 737ca4482b
1 changed files with 4 additions and 2 deletions
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6
libavcodec/vorbisdec.c
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@ -1510,8 +1510,10 @@ static int vorbis_parse_audio_packet(vorbis_context *vc)
blockflag = vc->modes[mode_number].blockflag;
blocksize = vc->blocksize[blockflag];
vlen = blocksize / 2;
if (blockflag)
skip_bits(gb, 2); // previous_window, next_window
if (blockflag) {
previous_window = get_bits(gb, 1);
skip_bits1(gb); // next_window
}
memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?