Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

Make tables generation insensitive to floating-point implementation

Browse Source 
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>
oldabi
Vitor Sessak 14 years ago committed by Mans Rullgard
parent e063f5886b
commit 47d62c965b
1 changed files with 16 additions and 9 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 21
      libavcodec/bink.c

21
libavcodec/bink.c
Unescape View File

@ -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++) {
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]/(float)binkb_den[j];
binkb_num[j]/(double)binkb_den[j];
binkb_inter_quant[j][i] = (1L << 12) * binkb_inter_seed[i] * s[i] *
binkb_num[j]/(float)binkb_den[j];
binkb_num[j]/(double)binkb_den[j];
}
}
}
}

Write Preview
Loading…
Cancel
Save