From 645a6be1e763441ee38ecc1b55b8d0408ef8f04f Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 23 Sep 2008 23:16:48 +0000
Subject: [PATCH] Merge the 2 lpc loops. This changes the output by (stddev:
0.21 PSNR:109.51, file:ddinterview28.ra), the changes are due to float
rounding inaccuracies and do not happen if doubles are used.
Originally committed as revision 15394 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/ra288.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c
index c56718a5212..f7e1af55a03 100644
--- a/libavcodec/ra288.c
+++ b/libavcodec/ra288.c
@@ -103,16 +103,14 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
gain_block[9] = 10 * log10(sum) - 32;
for (i=0; i < 5; i++) {
- block[i] = 0;
+ block[i] = buffer[i];
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++)
- block[i] = av_clipf(block[i] + buffer[i], -4095, 4095);
+ block[i] = av_clipf(block[i], -4095, 4095);
}
static void convolve(float *tgt, const float *src, int len, int n)
--
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