Hello,
When trying out the new sox support in 0.19, I noticed the best recipe
SOXR_VHQ sounds a little more harsh than what we used in the past, which
was samplerate_converter "1" (medium sinc) in 0.18.X
I could never get samplerate_converter "0" to work on power efficient
atom/celeron hardware.
Sox is way more efficient than libsamplerate, so we started testing
SOXR_LSR0Q which is sox's libsamplerate emulation for libsamplerate's
"best sinc".
It actually sounded much better than the real libsamplerate's "Medium
Sinc Interpolator", so I wrote a small patch to include these recipes.
example for a 24/96 .wav file upsampling to 705.6 kHz on a celeron 847,
which my ifi dac supports:
samplerate_converter "soxr best sinc" consumes 20% cpu on one core
samplerate_converter "1 " consumes 95% cpu on one core
As the difference in sound quality between these two upsamplers is day
and night in favor for sox, and the cpu load is only a fraction, please
find my patch attached.
--
Best regards,
Frederic Vanden Poel
Klinkt Beter
www.klinktbeter.be
[email protected]
+32 473 79 36 91
Blauwe Paal 45
9230 Wetteren
--- SoxrResampler.cxx 2014-10-20 18:56:47.626263734 +0200
+++ SoxrResampler.cxx.new 2014-10-20 19:01:18.913522079 +0200
@@ -48,6 +48,12 @@
return "Low Quality";
case SOXR_QQ:
return "Quick";
+ case SOXR_LSR0Q:
+ return "Libsamplerate equivalent Best sinc";
+ case SOXR_LSR1Q:
+ return "Libsamplerate equivalent Medium sinc";
+ case SOXR_LSR2Q:
+ return "Libsamplerate equivalent Fast sinc";
}
gcc_unreachable();
@@ -76,6 +82,12 @@
soxr_quality_recipe = SOXR_LQ;
else if (strcmp(quality, "quick") == 0)
soxr_quality_recipe = SOXR_QQ;
+ else if (strcmp(quality, "best sinc") == 0)
+ soxr_quality_recipe = SOXR_LSR0Q;
+ else if (strcmp(quality, "medium sinc") == 0)
+ soxr_quality_recipe = SOXR_LSR1Q;
+ else if (strcmp(quality, "fast sinc") == 0)
+ soxr_quality_recipe = SOXR_LSR2Q;
else
return false;
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