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takdec: pad filter coeff buffer for DSP functions

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Currently, a part of the loop has to be handled in plain C, because of DSP
function requirements of having batches of 16 elements to process.

Instead, pad the buffer with 0 where the DSP functions are overreading.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Christophe Gisquet 2013-05-10 11:32:58 +01:00 committed by James Almer
parent b7e7ee6231
commit e0c7ba40cf
1 changed files with 8 additions and 24 deletions
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32
libavcodec/takdec.c
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@ -372,7 +372,7 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
{
GetBitContext *gb = &s->gb;
int x, y, i, j, ret = 0;
int dshift, size, filter_quant, filter_order;
int dshift, size, filter_quant, filter_order, filter_order16;
int tfilter[MAX_PREDICTORS];
if (!get_bits1(gb))
@ -445,6 +445,9 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
tfilter[i] = s->predictors[i] << 6;
}
filter_order16 = FFALIGN(filter_order, 16);
AV_ZERO128(s->filter + filter_order16 - 16);
AV_ZERO128(s->filter + filter_order16 - 8);
x = 1 << (32 - (15 - filter_quant));
y = 1 << ((15 - filter_quant) - 1);
for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
@ -467,15 +470,8 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
for (i = 0; i < tmp; i++) {
int v = 1 << (filter_quant - 1);
if (filter_order & -16)
v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
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 += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
filter_order16);
v = (av_clip_intp2(v >> filter_quant, 13) << dshift) - *decoded;
*decoded++ = v;
s->residues[filter_order + i] = v >> dshift;
@ -596,6 +592,7 @@ static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
dval1 = get_bits1(gb);
dval2 = get_bits1(gb);
AV_ZERO128(s->filter + 8);
for (i = 0; i < filter_order; i++) {
if (!(i & 3))
code_size = 14 - get_bits(gb, 3);
@ -638,20 +635,7 @@ static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
for (i = 0; i < tmp; i++) {
int v = 1 << 9;
if (filter_order == 16) {
v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
filter_order);
} else {
v += s->residues[i + 7] * s->filter[7] +
s->residues[i + 6] * s->filter[6] +
s->residues[i + 5] * s->filter[5] +
s->residues[i + 4] * s->filter[4] +
s->residues[i + 3] * s->filter[3] +
s->residues[i + 2] * s->filter[2] +
s->residues[i + 1] * s->filter[1] +
s->residues[i ] * s->filter[0];
}
v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter, 16);
v = (av_clip_intp2(v >> 10, 13) << dshift) - *p1;
*p1++ = v;
}