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takdec: simplify use of scalarproduct_int16 in decode_subframe() 

Makes decoding little faster.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-05-09 09:59:38 +00:00
parent 43b6482d0a
commit 13cb6ed3c4
1 changed files with 7 additions and 20 deletions
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27
libavcodec/takdec.c
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@ -468,27 +468,14 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
for (i = 0; i < tmp; i++) {
int v = 1 << (filter_quant - 1);
if (!(filter_order & 15)) {
if (filter_order & -16)
v += s->dsp.scalarproduct_int16(&s->residues[i], s->filter,
filter_order);
} else if (filter_order & 4) {
for (j = 0; j < filter_order; j += 4) {
v += s->residues[i + j + 3] * s->filter[j + 3] +
s->residues[i + j + 2] * s->filter[j + 2] +
s->residues[i + j + 1] * s->filter[j + 1] +
s->residues[i + j ] * s->filter[j ];
}
} else {
for (j = 0; j < filter_order; j += 8) {
v += s->residues[i + j + 7] * s->filter[j + 7] +
s->residues[i + j + 6] * s->filter[j + 6] +
s->residues[i + j + 5] * s->filter[j + 5] +
s->residues[i + j + 4] * s->filter[j + 4] +
s->residues[i + j + 3] * s->filter[j + 3] +
s->residues[i + j + 2] * s->filter[j + 2] +
s->residues[i + j + 1] * s->filter[j + 1] +
s->residues[i + j ] * s->filter[j ];
}
filter_order & -16);
for (j = filter_order & -16; j < filter_order; j += 4) {
v += s->residues[i + j + 3] * s->filter[j + 3] +
s->residues[i + j + 2] * s->filter[j + 2] +
s->residues[i + j + 1] * s->filter[j + 1] +
s->residues[i + j ] * s->filter[j ];
}
v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
*decoded++ = v;