From 571bbaf81490997218cb74eb0a0e69ae24cbe85e Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 23 Sep 2008 22:49:22 +0000 Subject: [PATCH] Factorize lpc code slightly. Originally committed as revision 15393 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/ra288.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c index 1f177b5f5d..c56718a521 100644 --- a/libavcodec/ra288.c +++ b/libavcodec/ra288.c @@ -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++)