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| author | ariff <ariff@FreeBSD.org> | 2009-06-15 04:05:38 +0000 |
|---|---|---|
| committer | ariff <ariff@FreeBSD.org> | 2009-06-15 04:05:38 +0000 |
| commit | 548135de8c5758a1ed1974d90650e40b03cd5b87 (patch) | |
| tree | 2be3d7fb1b3eed0e74b8a7feceab7bab6a0a57ae | |
| parent | d573bd048d1afbc9827d0675e99125818da1fcd5 (diff) | |
| download | FreeBSD-src-548135de8c5758a1ed1974d90650e40b03cd5b87.zip FreeBSD-src-548135de8c5758a1ed1974d90650e40b03cd5b87.tar.gz | |
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.
| -rw-r--r-- | sys/dev/sound/pcm/feeder_rate.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/sys/dev/sound/pcm/feeder_rate.c b/sys/dev/sound/pcm/feeder_rate.c index 73a780a..eeb8e92 100644 --- a/sys/dev/sound/pcm/feeder_rate.c +++ b/sys/dev/sound/pcm/feeder_rate.c @@ -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 |
