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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "audio/softsynth/fmtowns_pc98/pcm_common.h"
#include "audio/mixer.h"
PCMChannel_Base::PCMChannel_Base() : _vol(0), _data(nullptr), _dataEnd(0), _loopLen(0), _pos(0), _loopStart(0), _step(0), _panLeft(7), _panRight(7), _activeOutput(false) {
}
PCMChannel_Base::~PCMChannel_Base() {
clear();
}
void PCMChannel_Base::clear() {
_vol = 0;
_data = nullptr;
_dataEnd = 0;
_loopLen = 0;
_pos = 0;
_loopStart = 0;
_step = 0;
_panLeft = _panRight = 7;
_activeOutput = false;
}
void PCMChannel_Base::updateOutput() {
if (!isPlaying())
return;
_pos += _step;
if (_pos >= _dataEnd) {
if (_loopStart != _dataEnd) {
_pos = _loopStart;
_dataEnd = _loopStart + _loopLen;
} else {
_pos = 0;
stopInternal();
}
}
}
int32 PCMChannel_Base::currentSampleLeft() {
return (isActive() && _panLeft) ? (((_data[_pos >> 11] * _vol) * _panLeft) >> 3) : 0;
}
int32 PCMChannel_Base::currentSampleRight() {
return (isActive() && _panRight) ? (((_data[_pos >> 11] * _vol) * _panRight) >> 3) : 0;
}
bool PCMChannel_Base::isActive() const {
return _activeOutput;
}
void PCMChannel_Base::activate() {
_activeOutput = true;
}
void PCMChannel_Base::deactivate() {
_activeOutput = false;
}
void PCMChannel_Base::setData(const int8 *data, uint32 dataEnd, uint32 dataStart) {
_data = data;
_dataEnd = dataEnd;
_pos = dataStart;
}
void PCMChannel_Base::setVolume(uint8 vol) {
_vol = vol;
}
void PCMChannel_Base::setPanPos(uint8 pan) {
_panLeft = pan & 0x0f;
_panRight = pan >> 4;
}
void PCMChannel_Base::setupLoop(uint32 loopStart, uint32 loopLen) {
_loopStart = loopStart << 11;
_loopLen = loopLen << 11;
}
void PCMChannel_Base::setRate(uint16 rate) {
_step = rate;
}
PCMDevice_Base::PCMDevice_Base(int samplingRate, int deviceVolume, int numChannels) : _numChannels(numChannels), _deviceVolume(deviceVolume), _intRate((7670454 << 8) / samplingRate),
_extRate(72 << 8), _timer(0), _musicVolume(Audio::Mixer::kMaxMixerVolume), _sfxVolume(Audio::Mixer::kMaxMixerVolume), _pcmSfxChanMask(0) {
_channels = new PCMChannel_Base*[numChannels];
}
PCMDevice_Base::~PCMDevice_Base() {
delete[] _channels;
}
void PCMDevice_Base::assignChannel(uint8 id, PCMChannel_Base *const chan) {
assert(id < _numChannels);
_channels[id] = chan;
}
void PCMDevice_Base::setMusicVolume(uint16 vol) {
_musicVolume = vol;
}
void PCMDevice_Base::setSfxVolume(uint16 vol) {
_sfxVolume = vol;
}
void PCMDevice_Base::setSfxChanMask(int mask) {
_pcmSfxChanMask = mask;
}
void PCMDevice_Base::readBuffer(int32 *buffer, uint32 bufferSize) {
for (uint32 i = 0; i < bufferSize; i++) {
_timer += _extRate;
while (_timer >= _intRate) {
_timer -= _intRate;
for (int ii = 0; ii < 8; ii++)
_channels[ii]->updateOutput();
}
int32 finOutL = 0;
int32 finOutR = 0;
for (int ii = 0; ii < _numChannels; ii++) {
if (_channels[ii]->isActive()) {
int32 oL = _channels[ii]->currentSampleLeft();
int32 oR = _channels[ii]->currentSampleRight();
if ((1 << ii) & (~_pcmSfxChanMask)) {
oL = (oL * _musicVolume) / Audio::Mixer::kMaxMixerVolume;
oR = (oR * _musicVolume) / Audio::Mixer::kMaxMixerVolume;
}
if ((1 << ii) & _pcmSfxChanMask) {
oL = (oL * _sfxVolume) / Audio::Mixer::kMaxMixerVolume;
oR = (oR * _sfxVolume) / Audio::Mixer::kMaxMixerVolume;
}
finOutL += oL;
finOutR += oR;
if (!_channels[ii]->isPlaying())
_channels[ii]->deactivate();
}
}
buffer[i << 1] += ((finOutL * _deviceVolume) >> 7);
buffer[(i << 1) + 1] += ((finOutR * _deviceVolume) >> 7);
}
}
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