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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-03-11 20:45:29 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-03-11 20:45:29 +0100 |
| commit | 5171ae781a240cac3860c20f9aefc6d1b2c61cac (patch) | |
| tree | b8cefa65555d1ba0d9e94b9cd792d59af63d646f | |
| parent | 5d75730c58f72918a41bb5abda4b448ecdd4273c (diff) | |
| download | ffmpeg-5171ae781a240cac3860c20f9aefc6d1b2c61cac.tar.gz | |
avcodec/vorbisdec: use the stored previous window type only when the actual previous is not known
Fixes Ticket3432
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/vorbisdec.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c index a2f7dd27f8..d928446722 100644 --- a/libavcodec/vorbisdec.c +++ b/libavcodec/vorbisdec.c @@ -151,7 +151,7 @@ typedef struct vorbis_context_s { uint8_t mode_count; vorbis_mode *modes; uint8_t mode_number; // mode number for the current packet - uint8_t previous_window; + int8_t previous_window; float *channel_residues; float *saved; } vorbis_context; @@ -989,7 +989,7 @@ static int vorbis_parse_id_hdr(vorbis_context *vc) if (!vc->channel_residues || !vc->saved) return AVERROR(ENOMEM); - vc->previous_window = 0; + vc->previous_window = -1; ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0); ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0); @@ -1548,7 +1548,7 @@ static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr) { GetBitContext *gb = &vc->gb; FFTContext *mdct; - unsigned previous_window = vc->previous_window; + int previous_window = vc->previous_window; unsigned mode_number, blockflag, blocksize; int i, j; uint8_t no_residue[255]; @@ -1581,9 +1581,11 @@ static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr) blocksize = vc->blocksize[blockflag]; vlen = blocksize / 2; if (blockflag) { - previous_window = get_bits(gb, 1); - skip_bits1(gb); // next_window - } + int code = get_bits(gb, 2); + if (previous_window < 0) + previous_window = code>>1; + } else if (previous_window < 0) + previous_window = 0; memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ? for (i = 0; i < vc->audio_channels; ++i) @@ -1812,7 +1814,7 @@ static av_cold void vorbis_decode_flush(AVCodecContext *avctx) memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved)); } - vc->previous_window = 0; + vc->previous_window = -1; } AVCodec ff_vorbis_decoder = { |