131 lines
4.6 KiB
C++
131 lines
4.6 KiB
C++
/**
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* @author Bojan MARKOVIC
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* @author Edouard DUPIN
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* @copyright 2006, ChunkWare Music Software, OPEN-SOURCE
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* @license BSD-1 (see license file)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* * The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <audio/algo/chunkware/Gate.h>
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#include <audio/algo/chunkware/debug.h>
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#include <cmath>
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audio::algo::chunkware::Gate::Gate() :
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AttRelEnvelope(1.0, 100.0),
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m_thresholddB(0.0),
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m_threshold(1.0),
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m_overThresholdEnvelope(DC_OFFSET) {
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}
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void audio::algo::chunkware::Gate::setThreshold(double _dB) {
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m_thresholddB = _dB;
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m_threshold = dB2lin(_dB);
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}
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void audio::algo::chunkware::Gate::init() {
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m_overThresholdEnvelope = DC_OFFSET;
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m_isConfigured = true;
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}
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std::vector<enum audio::format> audio::algo::chunkware::Gate::getSupportedFormat() {
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std::vector<enum audio::format> out = getNativeSupportedFormat();
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out.push_back(audio::format_int16);
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return out;
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}
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std::vector<enum audio::format> audio::algo::chunkware::Gate::getNativeSupportedFormat() {
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std::vector<enum audio::format> out;
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out.push_back(audio::format_double);
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return out;
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}
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void audio::algo::chunkware::Gate::process(void* _output, const void* _input, size_t _nbChunk, int8_t _nbChannel, enum audio::format _format) {
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// TODO : Check init ...
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if (_nbChannel != 1) {
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AA_CHUNK_ERROR("Can not compress with Other than single channel: " << _nbChannel);
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}
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switch (_format) {
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case audio::format_int16:
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{
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const int16_t* input = reinterpret_cast<const int16_t*>(_input);
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int16_t* output = reinterpret_cast<int16_t*>(_output);
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double vals[_nbChannel];
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for (size_t iii=0; iii<_nbChunk ; ++iii) {
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for (int8_t kkk=0; kkk<_nbChannel ; ++kkk) {
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vals[kkk] = double(input[iii*_nbChannel+kkk]) / 32768.0;
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}
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processDouble(vals, vals, _nbChannel);
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for (int8_t kkk=0; kkk<_nbChannel ; ++kkk) {
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vals[kkk] *= 32768.0;
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output[iii*_nbChannel+kkk] = int16_t(std::avg(-32768.0, vals[kkk], 32767.0));
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}
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}
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}
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break;
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case audio::format_double:
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{
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const double* input = reinterpret_cast<const double*>(_input);
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double* output = reinterpret_cast<double*>(_output);
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for (size_t iii=0; iii<_nbChunk ; ++iii) {
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processDouble(&output[iii*_nbChannel], &input[iii*_nbChannel], _nbChannel);
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//AA_CHUNK_INFO(" in=" << input[iii] << " => " << output[iii]);
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}
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}
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break;
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default:
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AA_CHUNK_ERROR("Can not compress with unsupported format : " << _format);
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return;
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}
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}
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void audio::algo::chunkware::Gate::processDouble(double* _out, const double* _in, int8_t _nbChannel) {
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double keyLink = 0;
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// get greater value;
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for (int8_t iii=0; iii<_nbChannel; ++iii) {
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double absValue = std::abs(_in[iii]);
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keyLink = std::max(keyLink, absValue);
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}
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processDouble(_out, _in, _nbChannel, keyLink);
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}
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void audio::algo::chunkware::Gate::processDouble(double* _out, const double* _in, int8_t _nbChannel, double _keyLinked) {
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// threshold
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// key over threshold (0.0 or 1.0)
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double over = double(_keyLinked > m_threshold);
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// attack/release
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over += DC_OFFSET; // add DC offset to avoid denormal
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audio::algo::chunkware::AttRelEnvelope::run(over, m_overThresholdEnvelope); // run attack/release
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over = m_overThresholdEnvelope - DC_OFFSET; // subtract DC offset
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/* REGARDING THE DC OFFSET: In this case, since the offset is added before
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* the attack/release processes, the envelope will never fall below the offset,
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* thereby avoiding denormals. However, to prevent the offset from causing
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* constant gain reduction, we must subtract it from the envelope, yielding
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* a minimum value of 0dB.
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*/
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// output gain
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for (int8_t iii=0; iii<_nbChannel; ++iii) {
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_out[iii] = _in[iii] * over;
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}
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}
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