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avcodec/vorbisdec: use the stored previous window type only when the actual previous is not known

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Fixes Ticket3432

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-03-11 20:45:29 +01:00
parent 5d75730c58
commit 5171ae781a
1 changed files with 9 additions and 7 deletions
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16
libavcodec/vorbisdec.c
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@ -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 = {