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pcm/Volume: move code to template pcm_volume_sample()

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This commit is contained in:
Max Kellermann 2013-12-23 10:03:05 +01:00
parent 6d21b9448a
commit 4a62cd4ad8
1 changed files with 16 additions and 7 deletions
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23
src/pcm/Volume.cxx
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@ -26,6 +26,20 @@
#include <stdint.h> #include <stdint.h>
#include <string.h> #include <string.h>
template<SampleFormat F, class Traits=SampleTraits<F>>
static inline typename Traits::value_type
pcm_volume_sample(typename Traits::value_type _sample,
int volume)
{
typename Traits::long_type sample(_sample);
sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1S / 2)
>> PCM_VOLUME_BITS;
return PcmClamp<F, Traits>(sample);
}
template<SampleFormat F, class Traits=SampleTraits<F>> template<SampleFormat F, class Traits=SampleTraits<F>>
static void static void
pcm_volume_change(typename Traits::pointer_type buffer, pcm_volume_change(typename Traits::pointer_type buffer,
@ -33,13 +47,8 @@ pcm_volume_change(typename Traits::pointer_type buffer,
int volume) int volume)
{ {
while (buffer < end) { while (buffer < end) {
typename Traits::long_type sample = *buffer; const auto sample = *buffer;
*buffer++ = pcm_volume_sample<F, Traits>(sample, volume);
sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1S / 2)
>> PCM_VOLUME_BITS;
*buffer++ = PcmClamp<F, Traits>(sample);
} }
} }