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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "Volume.hxx"
#include "Domain.hxx"
#include "PcmUtils.hxx"
#include "Traits.hxx"
#include "util/ConstBuffer.hxx"
#include "util/Error.hxx"
#include <stdint.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>>
static void
pcm_volume_change(typename Traits::pointer_type dest,
typename Traits::const_pointer_type src,
typename Traits::const_pointer_type end,
int volume)
{
while (src < end) {
const auto sample = *src++;
*dest++ = pcm_volume_sample<F, Traits>(sample, volume);
}
}
static void
pcm_volume_change_8(int8_t *dest, const int8_t *src, const int8_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S8>(dest, src, end, volume);
}
static void
pcm_volume_change_16(int16_t *dest, const int16_t *src, const int16_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S16>(dest, src, end, volume);
}
static void
pcm_volume_change_24(int32_t *dest, const int32_t *src, const int32_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S24_P32>(dest, src, end, volume);
}
static void
pcm_volume_change_32(int32_t *dest, const int32_t *src, const int32_t *end,
int volume)
{
pcm_volume_change<SampleFormat::S32>(dest, src, end, volume);
}
static void
pcm_volume_change_float(float *dest, const float *src, const float *end,
float volume)
{
while (src < end) {
float sample = *src++;
sample *= volume;
*dest++ = sample;
}
}
bool
PcmVolume::Open(SampleFormat _format, Error &error)
{
assert(format == SampleFormat::UNDEFINED);
switch (_format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
error.Format(pcm_domain,
"Software volume for %s is not implemented",
sample_format_to_string(_format));
return false;
case SampleFormat::S8:
case SampleFormat::S16:
case SampleFormat::S24_P32:
case SampleFormat::S32:
case SampleFormat::FLOAT:
break;
}
format = _format;
return true;
}
ConstBuffer<void>
PcmVolume::Apply(ConstBuffer<void> src)
{
if (volume == PCM_VOLUME_1)
return src;
void *data = buffer.Get(src.size);
if (volume == 0) {
/* optimized special case: 0% volume = memset(0) */
/* TODO: is this valid for all sample formats? What
about floating point? */
memset(data, 0, src.size);
return { data, src.size };
}
const void *end = pcm_end_pointer(src.data, src.size);
switch (format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
assert(false);
gcc_unreachable();
case SampleFormat::S8:
pcm_volume_change_8((int8_t *)data,
(const int8_t *)src.data,
(const int8_t *)end,
volume);
break;
case SampleFormat::S16:
pcm_volume_change_16((int16_t *)data,
(const int16_t *)src.data,
(const int16_t *)end,
volume);
break;
case SampleFormat::S24_P32:
pcm_volume_change_24((int32_t *)data,
(const int32_t *)src.data,
(const int32_t *)end,
volume);
break;
case SampleFormat::S32:
pcm_volume_change_32((int32_t *)data,
(const int32_t *)src.data,
(const int32_t *)end,
volume);
break;
case SampleFormat::FLOAT:
pcm_volume_change_float((float *)data,
(const float *)src.data,
(const float *)end,
pcm_volume_to_float(volume));
break;
}
return { data, src.size };
}
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