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dither lpc cpeffs
author
Michael Niedermayer
<michaelni@gmx.at>
Thu, 13 Jul 2006 11:41:52 +0000
(11:41 +0000)
committer
Michael Niedermayer
<michaelni@gmx.at>
Thu, 13 Jul 2006 11:41:52 +0000
(11:41 +0000)
Originally committed as revision 5727 to svn://svn.ffmpeg.org/ffmpeg/trunk
libavcodec/flacenc.c
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diff --git
a/libavcodec/flacenc.c
b/libavcodec/flacenc.c
index
6d4e1d0
..
e21326d
100644
(file)
--- a/
libavcodec/flacenc.c
+++ b/
libavcodec/flacenc.c
@@
-661,7
+661,7
@@
static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
int32_t *lpc_out, int *shift)
{
int i;
- double cmax;
+ double cmax
, error
;
int32_t qmax;
int sh;
@@
-697,8
+697,11
@@
static void quantize_lpc_coefs(double *lpc_in, int order, int precision,
}
/* output quantized coefficients and level shift */
+ error=0;
for(i=0; i<order; i++) {
- lpc_out[i] = (int32_t)(lpc_in[i] * (1 << sh));
+ error += lpc_in[i] * (1 << sh);
+ lpc_out[i] = clip(lrintf(error), -qmax, qmax);
+ error -= lpc_out[i];
}
*shift = sh;
}