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pcm/Volume: add constant PCM_VOLUME_BITS

This commit is contained in:
Max Kellermann 2013-12-22 17:37:36 +01:00
parent bfe020e06c
commit 316a25dead
2 changed files with 6 additions and 1 deletions
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2
src/pcm/PcmVolume.cxx
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@ -37,7 +37,7 @@ pcm_volume_change(typename Traits::pointer_type buffer,
sample = (sample * volume + pcm_volume_dither() + sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1S / 2) PCM_VOLUME_1S / 2)
/ PCM_VOLUME_1S; >> PCM_VOLUME_BITS;
*buffer++ = PcmClamp<F, Traits>(sample); *buffer++ = PcmClamp<F, Traits>(sample);
} }

5
src/pcm/PcmVolume.hxx
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@ -26,6 +26,11 @@
#include <stdint.h> #include <stdint.h>
#include <stddef.h> #include <stddef.h>
/**
* Number of fractional bits for a fixed-point volume value.
*/
static constexpr unsigned PCM_VOLUME_BITS = 10;
/** /**
* This value means "100% volume". * This value means "100% volume".
*/ */