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/* aKode Volume-Filter
Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "audioframe.h"
#include "arithmetic.h"
#include "volumefilter.h"
#define VM_FIDELITY (1<<14)
namespace aKode {
VolumeFilter::VolumeFilter() : m_volume(0) {}
// T is the input/output type, S is the fast arithmetics type, Arithm is a division definition
template<typename T, typename S, template<typename S> class Arithm>
static bool _doFrame(AudioFrame* in, AudioFrame* out, int volume)
{
T** indata = (T**)in->data;
T** outdata = (T**)out->data;
long length = in->length;
if (in->channels != out->channels) return false;
if (in->sample_width != out->sample_width) return false;
S smax = Arithm<S>::max(in->sample_width);
for(int i=0; i<in->channels; i++) {
for(int j=0; j<length; j++) {
S signal = Arithm<S>::muldiv(outdata[i][j], volume, VM_FIDELITY);
if (signal > smax) signal = smax;
else
if (signal < -smax) signal = -smax;
indata[i][j] = (T)(signal);
}
}
return true;
}
bool VolumeFilter::doFrame(AudioFrame* in, AudioFrame* out)
{
if (!out) out = in;
int volint = (int)(m_volume*VM_FIDELITY+0.5);
if (in->sample_width < -32) {
return _doFrame<double, double, Arithm_FP>(in, out, volint);
} else
if (in->sample_width < 0) {
return _doFrame<float, float, Arithm_FP>(in, out, volint);
} else
if (in->sample_width <= 8) {
return _doFrame<int8_t, int32_t, Arithm_Int>(in, out, volint);
} else
if (in->sample_width <= 16) {
return _doFrame<int16_t, int32_t, Arithm_Int>(in, out, volint);
} else
if (in->sample_width <= 24) {
return _doFrame<int32_t, int32_t, Arithm_Int>(in, out, volint);
} else
return _doFrame<int32_t, int64_t, Arithm_Int>(in, out, volint);
}
void VolumeFilter::setVolume(float volume) {
m_volume = volume;
}
float VolumeFilter::volume() const {
return m_volume;
}
} // namespace
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