diff options
| -rw-r--r-- | libavcodec/mpegaudiodec.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/mpegaudiodec.c b/libavcodec/mpegaudiodec.c index dd986bd859..e531fd37d8 100644 --- a/libavcodec/mpegaudiodec.c +++ b/libavcodec/mpegaudiodec.c @@ -408,9 +408,10 @@ static av_cold int decode_init(AVCodecContext * avctx) int_pow_init(); for(i=1;i<TABLE_4_3_SIZE;i++) { + double value = i/4; double f, fm; int e, m; - f = pow((double)(i/4), 4.0 / 3.0) * pow(2, (i&3)*0.25); + f = value * cbrtf(value) * exp2f((i&3)*0.25); fm = frexp(f, &e); m = (uint32_t)(fm*(1LL<<31) + 0.5); e+= FRAC_BITS - 31 + 5 - 100; @@ -420,8 +421,9 @@ static av_cold int decode_init(AVCodecContext * avctx) table_4_3_exp[i] = -e; } for(i=0; i<512*16; i++){ + double value = i & 15; int exponent= (i>>4); - double f= pow(i&15, 4.0 / 3.0) * pow(2, (exponent-400)*0.25 + FRAC_BITS + 5); + double f= value * cbrtf(value) * exp2f((exponent-400)*0.25 + FRAC_BITS + 5); expval_table[exponent][i&15]= llrint(f); if((i&15)==1) exp_table[exponent]= llrint(f); |