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/* aKode: Converter
Copyright (C) 2005,2006 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 "arithmetic.h"
#include "audioframe.h"
#include "converter.h"
namespace aKode {
Converter::Converter(int sample_width) : m_sample_width(sample_width) {}
template<typename T, typename S, template<typename T> class ArithmT, template<typename S> class ArithmS>
static bool __doFrameFP(AudioFrame* in, AudioFrame* out, int sample_width)
{
AudioConfiguration config = *in;
config.sample_width = sample_width;
if (out)
out->reserveSpace(&config, in->length);
else
out = in;
// ### Use doubles if double sized or 32bit samples are used.
float scale = 1.0;
scale = ArithmS<S>::max(sample_width)/(float)ArithmT<T>::max(in->sample_width);
int channels = in->channels;
int length = in->length;
T** indata = (T**)in->data;
S** outdata = (S**)out->data;
for(int i=0; i<channels; i++)
for(int j=0; j<length; j++)
outdata[i][j] = (S)(scale*indata[i][j]);
return true;
}
template<typename T, typename S>
static bool __doFrame(AudioFrame* in, AudioFrame* out, int sample_width)
{
AudioConfiguration config = *in;
config.sample_width = sample_width;
if (out)
out->reserveSpace(&config, in->length);
else
out = in;
int width_T = sizeof(T)*8;
int shift = width_T - sample_width;
int channels = in->channels;
uint32_t length = in->length;
T** indata = (T**)in->data;
S** outdata = (S**)out->data;
for(int i=0; i<channels; i++)
for(uint32_t j=0; j<length; j++)
outdata[i][j] = (S)(indata[i][j] >> shift);
out->sample_width = sample_width;
return true;
}
template<typename T>
static inline bool _doFrameFP(AudioFrame* in, AudioFrame* out, int sample_width)
{
if (in->sample_width == -64) {
return __doFrameFP<double, T, Arithm_FP, Arithm_FP>(in, out, sample_width);
} else
if (in->sample_width == -32) {
return __doFrameFP<float, T, Arithm_FP, Arithm_FP>(in, out, sample_width);
} else
if (in->sample_width <= 8) {
return __doFrameFP<int8_t, T, Arithm_Int, Arithm_FP>(in, out, sample_width);
} else
if (in->sample_width <= 16) {
return __doFrameFP<int16_t, T, Arithm_Int, Arithm_FP>(in, out, sample_width);
} else
return __doFrameFP<int32_t, T, Arithm_Int, Arithm_FP>(in, out, sample_width);
}
template<typename T>
static inline bool _doFrame(AudioFrame* in, AudioFrame* out, int sample_width)
{
if (in->sample_width == -64) {
return __doFrameFP<double, T, Arithm_FP, Arithm_Int>(in, out, sample_width);
} else
if (in->sample_width == -32) {
return __doFrameFP<float, T, Arithm_FP, Arithm_Int>(in, out, sample_width);
} else
if (in->sample_width <= 8) {
return __doFrame<int8_t, T>(in, out, sample_width);
} else
if (in->sample_width <= 16) {
return __doFrame<int16_t, T>(in, out, sample_width);
} else
return __doFrame<int32_t, T>(in, out, sample_width);
}
bool Converter::doFrame(AudioFrame* in, AudioFrame* out)
{
if (m_sample_width == 0) return false;
if (!out && in->sample_width == m_sample_width) return true;
if (m_sample_width < 0) {
if (m_sample_width == -64)
return _doFrameFP<double>(in, out, m_sample_width);
else
return _doFrameFP<float>(in, out, m_sample_width);
} else
if (m_sample_width <= 8) {
return _doFrame<int8_t>(in, out, m_sample_width);
} else
if (m_sample_width <= 16) {
return _doFrame<int16_t>(in, out, m_sample_width);
} else
return _doFrame<int32_t>(in, out, m_sample_width);
return false;
}
void Converter::setSampleWidth(int sample_width)
{
m_sample_width = sample_width;
}
} // namespace
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