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/* REminiscence - Flashback interpreter
* Copyright (C) 2005-2011 Gregory Montoir
*
* 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 "mixer.h"
#include "sfx_player.h"
SfxPlayer::SfxPlayer(Mixer *mixer)
: _mod(0), _playing(false), _mix(mixer) {
}
void SfxPlayer::play(uint8 num) {
debug(DBG_SFX, "SfxPlayer::play(%d)", num);
if (!_playing) {
if (num >= 68 && num <= 75) {
static const Module *modTable[] = {
&_module68, &_module68, &_module70, &_module70,
&_module72, &_module73, &_module74, &_module75
};
_mod = modTable[num - 68];
_curOrder = 0;
_numOrders = READ_BE_UINT16(_mod->moduleData);
_orderDelay = 0;
_modData = _mod->moduleData + 0x22;
memset(_samples, 0, sizeof(_samples));
_samplesLeft = 0;
_mix->setPremixHook(mixCallback, this);
_playing = true;
}
}
}
void SfxPlayer::stop() {
if (_playing) {
_mix->setPremixHook(0, 0);
_playing = false;
}
}
void SfxPlayer::playSample(int channel, const uint8 *sampleData, uint16 period) {
assert(channel < NUM_CHANNELS);
SampleInfo *si = &_samples[channel];
si->len = READ_BE_UINT16(sampleData); sampleData += 2;
si->vol = READ_BE_UINT16(sampleData); sampleData += 2;
si->loopPos = READ_BE_UINT16(sampleData); sampleData += 2;
si->loopLen = READ_BE_UINT16(sampleData); sampleData += 2;
si->freq = PAULA_FREQ / period;
si->pos = 0;
si->data = sampleData;
}
void SfxPlayer::handleTick() {
if (!_playing) {
return;
}
if (_orderDelay != 0) {
--_orderDelay;
// check for end of song
if (_orderDelay == 0 && _modData == 0) {
_playing = false;
}
} else {
_orderDelay = READ_BE_UINT16(_mod->moduleData + 2);
debug(DBG_SFX, "curOrder=%d/%d _orderDelay=%d\n", _curOrder, _numOrders, _orderDelay);
int16 period = 0;
for (int ch = 0; ch < 3; ++ch) {
const uint8 *sampleData = 0;
uint8 b = *_modData++;
if (b != 0) {
--b;
assert(b < 5);
period = READ_BE_UINT16(_mod->moduleData + 4 + b * 2);
sampleData = _mod->sampleData[b];
}
b = *_modData++;
if (b != 0) {
int16 per = period + (b - 1);
if (per >= 0 && per < 40) {
per = _periodTable[per];
} else if (per == -3) {
per = 0xA0;
} else {
per = 0x71;
}
playSample(ch, sampleData, per);
}
}
++_curOrder;
if (_curOrder >= _numOrders) {
debug(DBG_SFX, "End of song");
_orderDelay += 20;
_modData = 0;
}
}
}
void SfxPlayer::mixSamples(int8 *buf, int samplesLen) {
for (int i = 0; i < NUM_CHANNELS; ++i) {
SampleInfo *si = &_samples[i];
if (si->data) {
int8 *mixbuf = buf;
int len = si->len << FRAC_BITS;
int loopLen = si->loopLen << FRAC_BITS;
int loopPos = si->loopPos << FRAC_BITS;
int deltaPos = (si->freq << FRAC_BITS) / _mix->getSampleRate();
int curLen = samplesLen;
int pos = si->pos;
while (curLen != 0) {
int count;
if (loopLen > (2 << FRAC_BITS)) {
assert(si->loopPos + si->loopLen <= si->len);
if (pos >= loopPos + loopLen) {
pos -= loopLen;
}
count = MIN(curLen, (loopPos + loopLen - pos - 1) / deltaPos + 1);
curLen -= count;
} else {
if (pos >= len) {
count = 0;
} else {
count = MIN(curLen, (len - pos - 1) / deltaPos + 1);
}
curLen = 0;
}
while (count--) {
int out = resampleLinear(si, pos, deltaPos, FRAC_BITS);
Mixer::addclamp(*mixbuf++, out * si->vol / 64);
pos += deltaPos;
}
}
si->pos = pos;
}
}
}
bool SfxPlayer::mix(int8 *buf, int len) {
if (_playing) {
memset(buf, 0, len);
const int samplesPerTick = _mix->getSampleRate() / 50;
while (len != 0) {
if (_samplesLeft == 0) {
handleTick();
_samplesLeft = samplesPerTick;
}
int count = _samplesLeft;
if (count > len) {
count = len;
}
_samplesLeft -= count;
len -= count;
mixSamples(buf, count);
buf += count;
}
}
return _playing;
}
bool SfxPlayer::mixCallback(void *param, int8 *buf, int len) {
return ((SfxPlayer *)param)->mix(buf, len);
}
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