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.
---
libavcodec/vorbisdec.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
index d3f6faf..c83d49d 100644
--- a/libavcodec/vorbisdec.c
+++ b/libavcodec/vorbisdec.c
@@ -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 ?
--
1.7.1
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