From 571bbaf81490997218cb74eb0a0e69ae24cbe85e Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
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 1f177b5f5df..c56718a5212 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++)
--
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