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Implement lms_predict() 

(cherry picked from commit 83e31db195b9d0a07b0526eab5780817d8ce9444)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Mashiat Sarker Shakkhar 2011-11-06 03:02:11 +06:00 committed by Michael Niedermayer
parent f12f189638
commit afd930dca2
1 changed files with 17 additions and 0 deletions
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17
libavcodec/wmalosslessdec.c
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@ -757,6 +757,23 @@ static void reset_codec(WmallDecodeCtx *s)
static int lms_predict(WmallDecodeCtx *s, int ich, int ilms)
{
int32_t pred, icoef;
int recent = s->cdlms[ich][ilms].recent;
for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
pred += s->cdlms[ich][ilms].coefs[icoef] *
s->cdlms[ich][ilms].lms_prevvalues[icoef + recent];
pred += (1 << (s->cdlms[ich][ilms].scaling - 1));
/* XXX: Table 29 has:
iPred >= cdlms[iCh][ilms].scaling;
seems to me like a missing > */
pred >>= s->cdlms[ich][ilms].scaling;
return pred;
}
/**
*@brief Decode a single subframe (block).
*@param s codec context