svn commit: r194232 - head/sys/dev/sound/pcm

[Ariff Abdullah]

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