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Move constant multiplication out of the loop 

Originally committed as revision 15404 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-09-24 20:31:24 +00:00
parent e60daa340b
commit b6c7758168
1 changed files with 4 additions and 4 deletions
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8
libavcodec/ra288.c
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@ -96,12 +96,12 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
/* block 48 of G.728 spec */
/* exp(sum * 0.1151292546497) == pow(10.0,sum/20) */
sumsum = exp(sum * 0.1151292546497) * gain / 2048.;
sumsum = exp(sum * 0.1151292546497) * gain / (2048 * 4096);
for (i=0; i < 5; i++)
buffer[i] = codetable[cb_coef][i] * sumsum;
sum = scalar_product_float(buffer, buffer, 5) / 5;
sum = (4096 * 4096) * scalar_product_float(buffer, buffer, 5) / 5;
sum = FFMAX(sum, 1);
@ -118,7 +118,7 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
/* output */
for (i=0; i < 5; i++)
block[i] = av_clipf(block[i], -4095, 4095);
block[i] = av_clipf(block[i], -4095./4096., 4095./4096.);
}
/**
@ -210,7 +210,7 @@ static int ra288_decode_frame(AVCodecContext * avctx, void *data,
decode(ractx, gain, cb_coef);
for (j=0; j < 5; j++)
*(out++) = (1/4096.) * ractx->sp_hist[70 + 36 + j];
*(out++) = ractx->sp_hist[70 + 36 + j];
if ((i & 7) == 3)
backward_filter(ractx);