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Make tables generation insensitive to floating-point implementation

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Using doubles make the double -> int cast well defined for all the values
used, with the exception of when s[i]==1.0, which is special-cased.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Vitor Sessak 2011-02-12 10:15:58 +01:00 committed by Mans Rullgard
parent e063f5886b
commit 47d62c965b
1 changed files with 16 additions and 9 deletions
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25
libavcodec/bink.c
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@ -1217,30 +1217,37 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
*/
static av_cold void binkb_calc_quant()
{
float s[64];
double s[64];
int i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
if (j && j != 4)
if (i && i != 4)
s[j*8 + i] = cos(j * M_PI/16.0f) * cos(i * M_PI/16.0f) * 2.0f;
s[j*8 + i] = cos(j * M_PI/16.0) * cos(i * M_PI/16.0) * 2.0;
else
s[j*8 + i] = cos(j * M_PI/16.0f) * sqrt(2.0f);
s[j*8 + i] = cos(j * M_PI/16.0) * sqrt(2.0);
else
if (i && i != 4)
s[j*8 + i] = cos(i * M_PI/16.0f) * sqrt(2.0f);
s[j*8 + i] = cos(i * M_PI/16.0) * sqrt(2.0);
else
s[j*8 + i] = 1.0f;
s[j*8 + i] = 1.0;
}
}
for (j = 0; j < 16; j++) {
for (i = 0; i < 64; i++) {
binkb_intra_quant[j][i] = (1L << 12) * binkb_intra_seed[i] * s[i] *
binkb_num[j]/(float)binkb_den[j];
binkb_inter_quant[j][i] = (1L << 12) * binkb_inter_seed[i] * s[i] *
binkb_num[j]/(float)binkb_den[j];
if (s[i] == 1.0) {
binkb_intra_quant[j][i] = (1L << 12) * binkb_intra_seed[i] *
binkb_num[j]/binkb_den[j];
binkb_inter_quant[j][i] = (1L << 12) * binkb_inter_seed[i] *
binkb_num[j]/binkb_den[j];
} else {
binkb_intra_quant[j][i] = (1L << 12) * binkb_intra_seed[i] * s[i] *
binkb_num[j]/(double)binkb_den[j];
binkb_inter_quant[j][i] = (1L << 12) * binkb_inter_seed[i] * s[i] *
binkb_num[j]/(double)binkb_den[j];
}
}
}
}