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wmalossless: reset lms_update

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It may contain garbage at the end, and zeroing allows using DSP
with longer loops.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2015-02-07 09:20:09 +00:00 committed by Michael Niedermayer
parent 1de742145f
commit 46e2afa4dc
1 changed files with 14 additions and 12 deletions
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26
libavcodec/wmalosslessdec.c
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@ -147,8 +147,8 @@ typedef struct WmallDecodeCtx {
int coefsend;
int bitsend;
DECLARE_ALIGNED(16, int16_t, coefs)[MAX_ORDER + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
DECLARE_ALIGNED(16, int16_t, lms_prevvalues)[MAX_ORDER * 2];
DECLARE_ALIGNED(16, int16_t, lms_updates)[MAX_ORDER * 2];
DECLARE_ALIGNED(16, int16_t, lms_prevvalues)[MAX_ORDER * 2 + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
DECLARE_ALIGNED(16, int16_t, lms_updates)[MAX_ORDER * 2 + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
int recent;
} cdlms[WMALL_MAX_CHANNELS][9];
@ -711,17 +711,16 @@ static void lms_update(WmallDecodeCtx *s, int ich, int ilms, int input)
{
int recent = s->cdlms[ich][ilms].recent;
int range = 1 << s->bits_per_sample - 1;
int order = s->cdlms[ich][ilms].order;
if (recent)
recent--;
else {
memcpy(&s->cdlms[ich][ilms].lms_prevvalues[s->cdlms[ich][ilms].order],
s->cdlms[ich][ilms].lms_prevvalues,
2 * s->cdlms[ich][ilms].order);
memcpy(&s->cdlms[ich][ilms].lms_updates[s->cdlms[ich][ilms].order],
s->cdlms[ich][ilms].lms_updates,
2 * s->cdlms[ich][ilms].order);
recent = s->cdlms[ich][ilms].order - 1;
memcpy(s->cdlms[ich][ilms].lms_prevvalues + order,
s->cdlms[ich][ilms].lms_prevvalues, 2 * order);
memcpy(s->cdlms[ich][ilms].lms_updates + order,
s->cdlms[ich][ilms].lms_updates, 2 * order);
recent = order - 1;
}
s->cdlms[ich][ilms].lms_prevvalues[recent] = av_clip(input, -range, range - 1);
@ -732,9 +731,11 @@ static void lms_update(WmallDecodeCtx *s, int ich, int ilms, int input)
else
s->cdlms[ich][ilms].lms_updates[recent] = s->update_speed[ich];
s->cdlms[ich][ilms].lms_updates[recent + (s->cdlms[ich][ilms].order >> 4)] >>= 2;
s->cdlms[ich][ilms].lms_updates[recent + (s->cdlms[ich][ilms].order >> 3)] >>= 1;
s->cdlms[ich][ilms].lms_updates[recent + (order >> 4)] >>= 2;
s->cdlms[ich][ilms].lms_updates[recent + (order >> 3)] >>= 1;
s->cdlms[ich][ilms].recent = recent;
memset(s->cdlms[ich][ilms].lms_updates + recent + order, 0,
sizeof(s->cdlms[ich][ilms].lms_updates) - 2*(recent+order));
}
static void use_high_update_speed(WmallDecodeCtx *s, int ich)
@ -790,7 +791,8 @@ static void revert_cdlms(WmallDecodeCtx *s, int ch,
+ s->cdlms[ch][ilms].recent,
s->cdlms[ch][ilms].lms_updates
+ s->cdlms[ch][ilms].recent,
s->cdlms[ch][ilms].order,
FFALIGN(s->cdlms[ch][ilms].order,
WMALL_COEFF_PAD_SIZE),
WMASIGN(residue));
input = residue + (pred >> s->cdlms[ch][ilms].scaling);
lms_update(s, ch, ilms, input);