Author: ariff
Date: Mon Jun 15 04:05:38 2009
New Revision: 194232
URL: http://svn.freebsd.org/changeset/base/194232
Log:
Remap type of polynomial interpolators for better polyphase
coefficients quality:
- Linear interpolator for oversampling factor larger and equal
than 4096 (log2 = 12).
- Quadratic interpolator for oversampling factor larger and equal
than 256 (log2 = 8).
Default oversampling factor (128 ~ log2 = 7) will use OPT32X, which
provides better accuracy.
Modified:
head/sys/dev/sound/pcm/feeder_rate.c
Modified: head/sys/dev/sound/pcm/feeder_rate.c
==============================================================================
--- head/sys/dev/sound/pcm/feeder_rate.c Mon Jun 15 02:17:10 2009
(r194231)
+++ head/sys/dev/sound/pcm/feeder_rate.c Mon Jun 15 04:05:38 2009
(r194232)
@@ -789,13 +789,11 @@ z_resampler_sinc_len(struct z_info *info
defined(Z_COEFF_INTER_BSPLINE) || defined(Z_COEFF_INTERP_OPT32X) ||
\
defined(Z_COEFF_INTERP_OPT16X) || defined(Z_COEFF_INTERP_OPT8X) ||
\
defined(Z_COEFF_INTERP_OPT4X) || defined(Z_COEFF_INTERP_OPT2X))
-#if Z_DRIFT_SHIFT >= 8
+#if Z_DRIFT_SHIFT >= 12
#define Z_COEFF_INTERP_LINEAR 1
-#elif Z_DRIFT_SHIFT == 7
+#elif Z_DRIFT_SHIFT >= 8
#define Z_COEFF_INTERP_QUADRATIC 1
-#elif Z_DRIFT_SHIFT == 6
-#define Z_COEFF_INTERP_HERMITE 1
-#elif Z_DRIFT_SHIFT == 5
+#elif Z_DRIFT_SHIFT >= 5
#define Z_COEFF_INTERP_OPT32X 1
#elif Z_DRIFT_SHIFT == 4
#define Z_COEFF_INTERP_OPT16X 1
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