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Factorize lpc code slightly. 

Originally committed as revision 15393 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-09-23 22:49:22 +00:00
parent b6bd726843
commit 571bbaf814
1 changed files with 7 additions and 9 deletions
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16
libavcodec/ra288.c
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@ -79,12 +79,6 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
memmove(ractx->sp_hist + 70, ractx->sp_hist + 75, 36*sizeof(*block));
for (i=0; i < 5; i++) {
block[i] = 0.;
for (j=0; j < 36; j++)
block[i] -= block[i-1-j]*ractx->sp_lpc[j];
}
/* block 46 of G.728 spec */
sum = 32.;
for (i=0; i < 10; i++)
@ -108,9 +102,13 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
gain_block[9] = 10 * log10(sum) - 32;
for (i=1; i < 5; i++)
for (j=i-1; j >= 0; j--)
buffer[i] -= ractx->sp_lpc[i-j-1] * buffer[j];
for (i=0; i < 5; i++) {
block[i] = 0;
for (j=0; j < 36; j++)
block[i] -= block[i-1-j]*ractx->sp_lpc[j];
for (j=0; j < i; j++)
buffer[i] -= buffer[i-1-j]*ractx->sp_lpc[j];
}
/* output */
for (i=0; i < 5; i++)