On 3/11/2014 8:37, Max Kellermann wrote:
add new soxr recipes: libsamplerate equivalent SOXR_LSR0Q, SOXR_LSR1Q
>and SOXR_LSR2Q
Tried to summarize this info, but it's still long:
add new soxr recipes: libsamplerate equivalent SOXR_LSR0Q, SOXR_LSR1Q
and SOXR_LSR2Q
Since 0.19 mpd implements soxr, which is much faster than libsamplerate
(effiency x5 measured on a celeron).
Most power efficient cpu's such as atoms and celerons cannot handle
libsamplerate samplerate_converter "0" (best sinc), and are limited to
samplerate_converter "1" (medium sinc).
While the new samplerate_converter "soxr very high" provides a faster
alternative, it sounds a little more harsh.
soxr provides recipes that emulate libsamplerate settings which are
SOXR_LSR0Q , SOXR_LSR1Q and SOXR_LSR2Q, which remove this harshness.
This patch includes these better sounding libsamplerate equivalents:
samplerate_converter "soxr best sinc" uses the SOXR_LSR0Q recipe, and is
an alternative to samplerate_converter "0"
samplerate_converter "soxr medium sinc" uses the SOXR_LSR1Q recipe, and
is an alternative to samplerate_converter "1"
samplerate_converter "soxr fast sinc" uses the SOXR_LSR2Q recipe, and is
an alternative to samplerate_converter "2"
"soxr best sinc" sounds much better than samplerate_converter "1", and
uses a fraction of the cpu load:
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
--
Vriendelijke groeten,
Frederic Vanden Poel
Klinkt Beter
www.klinktbeter.be
[email protected]
+32 473 79 36 91
Blauwe Paal 45
9230 Wetteren
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