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149 lines
4.5 KiB
149 lines
4.5 KiB
/* aKode: Converter
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Copyright (C) 2005,2006 Allan Sandfeld Jensen <kde@carewolf.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "arithmetic.h"
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#include "audioframe.h"
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#include "converter.h"
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namespace aKode {
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Converter::Converter(int sample_width) : m_sample_width(sample_width) {}
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template<typename T, typename S, template<typename T_Type> class ArithmT, template<typename S_Type> class ArithmS>
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static bool __doFrameFP(AudioFrame* in, AudioFrame* out, int sample_width)
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{
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AudioConfiguration config = *in;
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config.sample_width = sample_width;
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if (out)
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out->reserveSpace(&config, in->length);
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else
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out = in;
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// ### Use doubles if double sized or 32bit samples are used.
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float scale = 1.0;
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scale = ArithmS<S>::max(sample_width)/(float)ArithmT<T>::max(in->sample_width);
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int channels = in->channels;
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int length = in->length;
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T** indata = (T**)in->data;
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S** outdata = (S**)out->data;
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for(int i=0; i<channels; i++)
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for(int j=0; j<length; j++)
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outdata[i][j] = (S)(scale*indata[i][j]);
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return true;
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}
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template<typename T, typename S>
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static bool __doFrame(AudioFrame* in, AudioFrame* out, int sample_width)
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{
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AudioConfiguration config = *in;
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config.sample_width = sample_width;
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if (out)
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out->reserveSpace(&config, in->length);
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else
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out = in;
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int width_T = sizeof(T)*8;
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int shift = width_T - sample_width;
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int channels = in->channels;
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uint32_t length = in->length;
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T** indata = (T**)in->data;
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S** outdata = (S**)out->data;
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for(int i=0; i<channels; i++)
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for(uint32_t j=0; j<length; j++)
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outdata[i][j] = (S)(indata[i][j] >> shift);
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out->sample_width = sample_width;
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return true;
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}
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template<typename T>
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static inline bool _doFrameFP(AudioFrame* in, AudioFrame* out, int sample_width)
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{
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if (in->sample_width == -64) {
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return __doFrameFP<double, T, Arithm_FP, Arithm_FP>(in, out, sample_width);
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} else
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if (in->sample_width == -32) {
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return __doFrameFP<float, T, Arithm_FP, Arithm_FP>(in, out, sample_width);
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} else
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if (in->sample_width <= 8) {
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return __doFrameFP<int8_t, T, Arithm_Int, Arithm_FP>(in, out, sample_width);
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} else
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if (in->sample_width <= 16) {
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return __doFrameFP<int16_t, T, Arithm_Int, Arithm_FP>(in, out, sample_width);
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} else
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return __doFrameFP<int32_t, T, Arithm_Int, Arithm_FP>(in, out, sample_width);
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}
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template<typename T>
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static inline bool _doFrame(AudioFrame* in, AudioFrame* out, int sample_width)
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{
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if (in->sample_width == -64) {
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return __doFrameFP<double, T, Arithm_FP, Arithm_Int>(in, out, sample_width);
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} else
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if (in->sample_width == -32) {
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return __doFrameFP<float, T, Arithm_FP, Arithm_Int>(in, out, sample_width);
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} else
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if (in->sample_width <= 8) {
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return __doFrame<int8_t, T>(in, out, sample_width);
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} else
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if (in->sample_width <= 16) {
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return __doFrame<int16_t, T>(in, out, sample_width);
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} else
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return __doFrame<int32_t, T>(in, out, sample_width);
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}
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bool Converter::doFrame(AudioFrame* in, AudioFrame* out)
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{
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if (m_sample_width == 0) return false;
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if (!out && in->sample_width == m_sample_width) return true;
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if (m_sample_width < 0) {
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if (m_sample_width == -64)
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return _doFrameFP<double>(in, out, m_sample_width);
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else
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return _doFrameFP<float>(in, out, m_sample_width);
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} else
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if (m_sample_width <= 8) {
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return _doFrame<int8_t>(in, out, m_sample_width);
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} else
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if (m_sample_width <= 16) {
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return _doFrame<int16_t>(in, out, m_sample_width);
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} else
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return _doFrame<int32_t>(in, out, m_sample_width);
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return false;
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}
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void Converter::setSampleWidth(int sample_width)
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{
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m_sample_width = sample_width;
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}
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} // namespace
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