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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-02-06 19:28:22 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-09-29 16:23:57 +0200 |
| commit | 574e87943e720ed6ea640cb51f7593bba07b4301 (patch) | |
| tree | 94b2b714df201de47ee6795b9f63906798c268e1 /libavcodec/bink.c | |
| parent | 062cd9acc129b46256e73900e8e49701e4bb00fd (diff) | |
| download | ffmpeg-574e87943e720ed6ea640cb51f7593bba07b4301.tar.gz | |
bink: get rid of double precision float use
Add a small table of integers instead as this is simpler and
avoid rounding issues (though such rounding issues are unlikely in this case)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/bink.c')
| -rw-r--r-- | libavcodec/bink.c | 38 |
1 files changed, 16 insertions, 22 deletions
diff --git a/libavcodec/bink.c b/libavcodec/bink.c index 9990700797..490e4be9ad 100644 --- a/libavcodec/bink.c +++ b/libavcodec/bink.c @@ -1228,40 +1228,34 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac static av_cold void binkb_calc_quant(void) { uint8_t inv_bink_scan[64]; - double s[64]; + static const int s[64]={ + 1073741824,1489322693,1402911301,1262586814,1073741824, 843633538, 581104888, 296244703, + 1489322693,2065749918,1945893874,1751258219,1489322693,1170153332, 806015634, 410903207, + 1402911301,1945893874,1832991949,1649649171,1402911301,1102260336, 759250125, 387062357, + 1262586814,1751258219,1649649171,1484645031,1262586814, 992008094, 683307060, 348346918, + 1073741824,1489322693,1402911301,1262586814,1073741824, 843633538, 581104888, 296244703, + 843633538,1170153332,1102260336, 992008094, 843633538, 662838617, 456571181, 232757969, + 581104888, 806015634, 759250125, 683307060, 581104888, 456571181, 314491699, 160326478, + 296244703, 410903207, 387062357, 348346918, 296244703, 232757969, 160326478, 81733730, + }; 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/16.0) * cos(i * M_PI/16.0) * 2.0; - else - 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/16.0) * sqrt(2.0); - else - s[j*8 + i] = 1.0; - } - } - +#define C (1LL<<30) for (i = 0; i < 64; i++) inv_bink_scan[bink_scan[i]] = i; for (j = 0; j < 16; j++) { for (i = 0; i < 64; i++) { int k = inv_bink_scan[i]; - if (s[i] == 1.0) { + if (s[i] == C) { binkb_intra_quant[j][k] = (1L << 12) * binkb_intra_seed[i] * binkb_num[j]/binkb_den[j]; binkb_inter_quant[j][k] = (1L << 12) * binkb_inter_seed[i] * binkb_num[j]/binkb_den[j]; } else { - binkb_intra_quant[j][k] = (1L << 12) * binkb_intra_seed[i] * s[i] * - binkb_num[j]/(double)binkb_den[j]; - binkb_inter_quant[j][k] = (1L << 12) * binkb_inter_seed[i] * s[i] * - binkb_num[j]/(double)binkb_den[j]; + binkb_intra_quant[j][k] = binkb_intra_seed[i] * (int64_t)s[i] * + binkb_num[j]/(binkb_den[j] * (C>>12)); + binkb_inter_quant[j][k] = binkb_inter_seed[i] * (int64_t)s[i] * + binkb_num[j]/(binkb_den[j] * (C>>12)); } } } |