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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 "PcmMix.hxx"
#include "Volume.hxx"
#include "PcmUtils.hxx"
#include "AudioFormat.hxx"
#include "Traits.hxx"
#include "util/Clamp.hxx"
#include <assert.h>
#include <math.h>
template<SampleFormat F, class Traits=SampleTraits<F>>
static typename Traits::value_type
PcmAddVolume(typename Traits::value_type _a, typename Traits::value_type _b,
int volume1, int volume2)
{
typename Traits::long_type a(_a), b(_b);
typename Traits::value_type c = ((a * volume1 + b * volume2) +
pcm_volume_dither() + PCM_VOLUME_1S / 2)
/ PCM_VOLUME_1S;
return PcmClamp<F, Traits>(c);
}
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAddVolume(typename Traits::pointer_type a,
typename Traits::const_pointer_type b,
size_t n, int volume1, int volume2)
{
for (size_t i = 0; i != n; ++i)
a[i] = PcmAddVolume<F, Traits>(a[i], b[i], volume1, volume2);
}
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAddVolumeVoid(void *a, const void *b, size_t size, int volume1, int volume2)
{
constexpr size_t sample_size = Traits::SAMPLE_SIZE;
assert(size % sample_size == 0);
PcmAddVolume<F, Traits>(typename Traits::pointer_type(a),
typename Traits::const_pointer_type(b),
size / sample_size,
volume1, volume2);
}
static void
pcm_add_vol_float(float *buffer1, const float *buffer2,
unsigned num_samples, float volume1, float volume2)
{
while (num_samples > 0) {
float sample1 = *buffer1;
float sample2 = *buffer2++;
sample1 = (sample1 * volume1 + sample2 * volume2);
*buffer1++ = sample1;
--num_samples;
}
}
static bool
pcm_add_vol(void *buffer1, const void *buffer2, size_t size,
int vol1, int vol2,
SampleFormat format)
{
switch (format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
/* not implemented */
return false;
case SampleFormat::S8:
PcmAddVolumeVoid<SampleFormat::S8>(buffer1, buffer2, size,
vol1, vol2);
return true;
case SampleFormat::S16:
PcmAddVolumeVoid<SampleFormat::S16>(buffer1, buffer2, size,
vol1, vol2);
return true;
case SampleFormat::S24_P32:
PcmAddVolumeVoid<SampleFormat::S24_P32>(buffer1, buffer2, size,
vol1, vol2);
return true;
case SampleFormat::S32:
PcmAddVolumeVoid<SampleFormat::S32>(buffer1, buffer2, size,
vol1, vol2);
return true;
case SampleFormat::FLOAT:
pcm_add_vol_float((float *)buffer1, (const float *)buffer2,
size / 4,
pcm_volume_to_float(vol1),
pcm_volume_to_float(vol2));
return true;
}
assert(false);
gcc_unreachable();
}
template<SampleFormat F, class Traits=SampleTraits<F>>
static typename Traits::value_type
PcmAdd(typename Traits::value_type _a, typename Traits::value_type _b)
{
typename Traits::sum_type a(_a), b(_b);
return PcmClamp<F, Traits>(a + b);
}
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAdd(typename Traits::pointer_type a,
typename Traits::const_pointer_type b,
size_t n)
{
for (size_t i = 0; i != n; ++i)
a[i] = PcmAdd<F, Traits>(a[i], b[i]);
}
template<SampleFormat F, class Traits=SampleTraits<F>>
static void
PcmAddVoid(void *a, const void *b, size_t size)
{
constexpr size_t sample_size = Traits::SAMPLE_SIZE;
assert(size % sample_size == 0);
PcmAdd<F, Traits>(typename Traits::pointer_type(a),
typename Traits::const_pointer_type(b),
size / sample_size);
}
static void
pcm_add_float(float *buffer1, const float *buffer2, unsigned num_samples)
{
while (num_samples > 0) {
float sample1 = *buffer1;
float sample2 = *buffer2++;
*buffer1++ = sample1 + sample2;
--num_samples;
}
}
static bool
pcm_add(void *buffer1, const void *buffer2, size_t size,
SampleFormat format)
{
switch (format) {
case SampleFormat::UNDEFINED:
case SampleFormat::DSD:
/* not implemented */
return false;
case SampleFormat::S8:
PcmAddVoid<SampleFormat::S8>(buffer1, buffer2, size);
return true;
case SampleFormat::S16:
PcmAddVoid<SampleFormat::S16>(buffer1, buffer2, size);
return true;
case SampleFormat::S24_P32:
PcmAddVoid<SampleFormat::S24_P32>(buffer1, buffer2, size);
return true;
case SampleFormat::S32:
PcmAddVoid<SampleFormat::S32>(buffer1, buffer2, size);
return true;
case SampleFormat::FLOAT:
pcm_add_float((float *)buffer1, (const float *)buffer2,
size / 4);
return true;
}
assert(false);
gcc_unreachable();
}
bool
pcm_mix(void *buffer1, const void *buffer2, size_t size,
SampleFormat format, float portion1)
{
float s;
/* portion1 is between 0.0 and 1.0 for crossfading, MixRamp uses -1
* to signal mixing rather than fading */
if (portion1 < 0)
return pcm_add(buffer1, buffer2, size, format);
s = sin(M_PI_2 * portion1);
s *= s;
int vol1 = s * PCM_VOLUME_1S + 0.5;
vol1 = Clamp<int>(vol1, 0, PCM_VOLUME_1S);
return pcm_add_vol(buffer1, buffer2, size, vol1, PCM_VOLUME_1S - vol1, format);
}
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