void SfxPlayer::stop() {
debug(DBG_SND, "SfxPlayer::stop()");
MutexStack(_stub, _mutex);
if (_resNum != 0) {
_resNum = 0;
_stub->removeTimer(_timerId);
}
}
void Mixer::playChannel(uint8 channel, const MixerChunk *mc, uint16 freq, uint8 volume) {
debug(DBG_SND, "Mixer::playChannel(%d, %d, %d)", channel, freq, volume);
assert(channel < NUM_CHANNELS);
MutexStack(_stub, _mutex);
MixerChannel *ch = &_channels[channel];
ch->active = true;
ch->volume = volume;
ch->chunk = *mc;
ch->chunkPos = 0;
ch->chunkInc = (freq << 8) / _stub->getOutputSampleRate();
}
void SfxPlayer::handleEvents() {
MutexStack(sys, _mutex);
uint8_t order = _sfxMod.orderTable[_sfxMod.curOrder];
const uint8_t *patternData = _sfxMod.data + _sfxMod.curPos + order * 1024;
for (uint8_t ch = 0; ch < 4; ++ch) {
handlePattern(ch, patternData);
patternData += 4;
}
_sfxMod.curPos += 4 * 4;
debug(DBG_SND, "SfxPlayer::handleEvents() order = 0x%X curPos = 0x%X", order, _sfxMod.curPos);
if (_sfxMod.curPos >= 1024) {
_sfxMod.curPos = 0;
order = _sfxMod.curOrder + 1;
if (order == _sfxMod.numOrder) {
_resNum = 0;
sys->removeTimer(_timerId);
mixer->stopAll();
}
_sfxMod.curOrder = order;
}
}
void Mixer::mix(int8 *buf, int len) {
MutexStack(_stub, _mutex);
memset(buf, 0, len);
for (uint8 i = 0; i < NUM_CHANNELS; ++i) {
MixerChannel *ch = &_channels[i];
if (ch->active) {
int8 *pBuf = buf;
for (int j = 0; j < len; ++j, ++pBuf) {
uint16 p1, p2;
uint16 ilc = (ch->chunkPos & 0xFF);
p1 = ch->chunkPos >> 8;
ch->chunkPos += ch->chunkInc;
if (ch->chunk.loopLen != 0) {
if (p1 == ch->chunk.loopPos + ch->chunk.loopLen - 1) {
debug(DBG_SND, "Looping sample on channel %d", i);
ch->chunkPos = p2 = ch->chunk.loopPos;
} else {
p2 = p1 + 1;
}
} else {
if (p1 == ch->chunk.len - 1) {
debug(DBG_SND, "Stopping sample on channel %d", i);
ch->active = false;
break;
} else {
p2 = p1 + 1;
}
}
// interpolate
int8 b1 = *(int8 *)(ch->chunk.data + p1);
int8 b2 = *(int8 *)(ch->chunk.data + p2);
int8 b = (int8)((b1 * (0xFF - ilc) + b2 * ilc) >> 8);
// set volume and clamp
*pBuf = addclamp(*pBuf, (int)b * ch->volume / 0x40);
}
}
}
void SfxPlayer::start() {
debug(DBG_SND, "SfxPlayer::start()");
MutexStack(sys, _mutex);
_sfxMod.curPos = 0;
_timerId = sys->addTimer(_delay, eventsCallback, this);
}
void SfxPlayer::setEventsDelay(uint16_t delay) {
debug(DBG_SND, "SfxPlayer::setEventsDelay(%d)", delay);
MutexStack(sys, _mutex);
_delay = delay * 60 / 7050;
}
void Mixer::setChannelVolume(uint8 channel, uint8 volume) {
debug(DBG_SND, "Mixer::setChannelVolume(%d, %d)", channel, volume);
assert(channel < NUM_CHANNELS);
MutexStack(_stub, _mutex);
_channels[channel].volume = volume;
}
void Mixer::stopChannel(uint8 channel) {
debug(DBG_SND, "Mixer::stopChannel(%d)", channel);
assert(channel < NUM_CHANNELS);
MutexStack(_stub, _mutex);
_channels[channel].active = false;
}