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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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "sci/sound/drivers/mididriver.h"
#include "audio/softsynth/emumidi.h"
#include "audio/softsynth/cms.h"
#include "audio/mixer.h"
#include "common/system.h"
#include "sci/resource.h"
#include "sci/util.h"
namespace Sci {
// FIXME: We don't seem to be sending the polyphony init data, so disable this for now
#define CMS_DISABLE_VOICE_MAPPING
class MidiDriver_CMS : public MidiDriver_Emulated {
public:
MidiDriver_CMS(Audio::Mixer *mixer, ResourceManager *resMan)
: MidiDriver_Emulated(mixer), _resMan(resMan), _cms(0), _rate(0), _playSwitch(true), _masterVolume(0) {
}
int open();
void close();
void send(uint32 b);
uint32 property(int prop, uint32 param);
MidiChannel *allocateChannel() { return 0; }
MidiChannel *getPercussionChannel() { return 0; }
bool isStereo() const { return true; }
int getRate() const { return _rate; }
void playSwitch(bool play);
private:
void generateSamples(int16 *buffer, int len);
ResourceManager *_resMan;
CMSEmulator *_cms;
void writeToChip1(int address, int data);
void writeToChip2(int address, int data);
int32 _samplesPerCallback;
int32 _samplesPerCallbackRemainder;
int32 _samplesTillCallback;
int32 _samplesTillCallbackRemainder;
int _rate;
bool _playSwitch;
uint16 _masterVolume;
Common::SpanOwner<SciSpan<uint8> > _patchData;
struct Channel {
Channel()
: patch(0), volume(0), pan(0x40), hold(0), extraVoices(0),
pitchWheel(0x2000), pitchModifier(0), pitchAdditive(false),
lastVoiceUsed(0) {
}
uint8 patch;
uint8 volume;
uint8 pan;
uint8 hold;
uint8 extraVoices;
uint16 pitchWheel;
uint8 pitchModifier;
bool pitchAdditive;
uint8 lastVoiceUsed;
};
Channel _channel[16];
struct Voice {
Voice() : channel(0xFF), note(0xFF), sustained(0xFF), ticks(0),
turnOffTicks(0), patchDataPtr(), patchDataIndex(0),
amplitudeTimer(0), amplitudeModifier(0), turnOff(false),
velocity(0) {
}
uint8 channel;
uint8 note;
uint8 sustained;
uint16 ticks;
uint16 turnOffTicks;
SciSpan<uint8> patchDataPtr;
uint8 patchDataIndex;
uint8 amplitudeTimer;
uint8 amplitudeModifier;
bool turnOff;
uint8 velocity;
};
Voice _voice[12];
void voiceOn(int voice, int note, int velocity);
void voiceOff(int voice);
void noteSend(int voice);
void noteOn(int channel, int note, int velocity);
void noteOff(int channel, int note);
void controlChange(int channel, int control, int value);
void pitchWheel(int channel, int value);
void voiceMapping(int channel, int value);
void bindVoices(int channel, int voices);
void unbindVoices(int channel, int voices);
void donateVoices();
int findVoice(int channel);
int findVoiceBasic(int channel);
void updateVoiceAmplitude(int voice);
void setupVoiceAmplitude(int voice);
uint8 _octaveRegs[2][3];
static const int _timerFreq = 60;
static const int _frequencyTable[];
static const int _velocityTable[];
};
const int MidiDriver_CMS::_frequencyTable[] = {
3, 10, 17, 24,
31, 38, 46, 51,
58, 64, 71, 77,
83, 89, 95, 101,
107, 113, 119, 124,
130, 135, 141, 146,
151, 156, 162, 167,
172, 177, 182, 186,
191, 196, 200, 205,
209, 213, 217, 222,
226, 230, 234, 238,
242, 246, 250, 253
};
const int MidiDriver_CMS::_velocityTable[] = {
1, 3, 6, 8, 9, 10, 11, 12,
12, 13, 13, 14, 14, 14, 15, 15,
0, 1, 2, 2, 3, 4, 4, 5,
6, 6, 7, 8, 8, 9, 10, 10
};
int MidiDriver_CMS::open() {
if (_cms)
return MERR_ALREADY_OPEN;
assert(_resMan);
Resource *res = _resMan->findResource(ResourceId(kResourceTypePatch, 101), false);
if (!res)
return -1;
_patchData->allocateFromSpan(*res);
for (uint i = 0; i < ARRAYSIZE(_channel); ++i)
_channel[i] = Channel();
for (uint i = 0; i < ARRAYSIZE(_voice); ++i)
_voice[i] = Voice();
_rate = _mixer->getOutputRate();
_cms = new CMSEmulator(_rate);
assert(_cms);
_playSwitch = true;
_masterVolume = 0;
for (int i = 0; i < 31; ++i) {
writeToChip1(i, 0);
writeToChip2(i, 0);
}
writeToChip1(0x14, 0xFF);
writeToChip2(0x14, 0xFF);
writeToChip1(0x1C, 1);
writeToChip2(0x1C, 1);
_samplesPerCallback = getRate() / _timerFreq;
_samplesPerCallbackRemainder = getRate() % _timerFreq;
_samplesTillCallback = 0;
_samplesTillCallbackRemainder = 0;
int retVal = MidiDriver_Emulated::open();
if (retVal != 0)
return retVal;
_mixer->playStream(Audio::Mixer::kPlainSoundType, &_mixerSoundHandle, this, -1, _mixer->kMaxChannelVolume, 0, DisposeAfterUse::NO);
return 0;
}
void MidiDriver_CMS::close() {
_mixer->stopHandle(_mixerSoundHandle);
_patchData.clear();
delete _cms;
_cms = nullptr;
}
void MidiDriver_CMS::send(uint32 b) {
const uint8 command = b & 0xf0;
const uint8 channel = b & 0xf;
const uint8 op1 = (b >> 8) & 0xff;
const uint8 op2 = (b >> 16) & 0xff;
switch (command) {
case 0x80:
noteOff(channel, op1);
break;
case 0x90:
noteOn(channel, op1, op2);
break;
case 0xB0:
controlChange(channel, op1, op2);
break;
case 0xC0:
_channel[channel].patch = op1;
break;
case 0xE0:
pitchWheel(channel, (op1 & 0x7f) | ((op2 & 0x7f) << 7));
break;
default:
break;
}
}
uint32 MidiDriver_CMS::property(int prop, uint32 param) {
switch (prop) {
case MIDI_PROP_MASTER_VOLUME:
if (param != 0xffff)
_masterVolume = param;
return _masterVolume;
default:
return MidiDriver_Emulated::property(prop, param);
}
}
void MidiDriver_CMS::playSwitch(bool play) {
_playSwitch = play;
}
void MidiDriver_CMS::writeToChip1(int address, int data) {
_cms->portWrite(0x221, address);
_cms->portWrite(0x220, data);
if (address >= 16 && address <= 18)
_octaveRegs[0][address - 16] = data;
}
void MidiDriver_CMS::writeToChip2(int address, int data) {
_cms->portWrite(0x223, address);
_cms->portWrite(0x222, data);
if (address >= 16 && address <= 18)
_octaveRegs[1][address - 16] = data;
}
void MidiDriver_CMS::voiceOn(int voiceNr, int note, int velocity) {
Voice &voice = _voice[voiceNr];
voice.note = note;
voice.turnOff = false;
voice.patchDataIndex = 0;
voice.amplitudeTimer = 0;
voice.ticks = 0;
voice.turnOffTicks = 0;
voice.patchDataPtr = _patchData->subspan(_patchData->getUint16LEAt(_channel[voice.channel].patch * 2));
if (velocity)
velocity = _velocityTable[(velocity >> 3)];
voice.velocity = velocity;
noteSend(voiceNr);
}
void MidiDriver_CMS::voiceOff(int voiceNr) {
Voice &voice = _voice[voiceNr];
voice.velocity = 0;
voice.note = 0xFF;
voice.sustained = 0;
voice.turnOff = false;
voice.patchDataIndex = 0;
voice.amplitudeTimer = 0;
voice.amplitudeModifier = 0;
voice.ticks = 0;
voice.turnOffTicks = 0;
setupVoiceAmplitude(voiceNr);
}
void MidiDriver_CMS::noteSend(int voiceNr) {
Voice &voice = _voice[voiceNr];
int frequency = (CLIP<int>(voice.note, 21, 116) - 21) * 4;
if (_channel[voice.channel].pitchModifier) {
int modifier = _channel[voice.channel].pitchModifier;
if (!_channel[voice.channel].pitchAdditive) {
if (frequency > modifier)
frequency -= modifier;
else
frequency = 0;
} else {
int tempFrequency = 384 - frequency;
if (modifier < tempFrequency)
frequency += modifier;
else
frequency = 383;
}
}
int chipNumber = 0;
if (voiceNr >= 6) {
voiceNr -= 6;
chipNumber = 1;
}
int octave = 0;
while (frequency >= 48) {
frequency -= 48;
++octave;
}
frequency = _frequencyTable[frequency];
if (chipNumber == 1)
writeToChip2(8 + voiceNr, frequency);
else
writeToChip1(8 + voiceNr, frequency);
uint8 octaveData = _octaveRegs[chipNumber][voiceNr >> 1];
if (voiceNr & 1) {
octaveData &= 0x0F;
octaveData |= (octave << 4);
} else {
octaveData &= 0xF0;
octaveData |= octave;
}
if (chipNumber == 1)
writeToChip2(0x10 + (voiceNr >> 1), octaveData);
else
writeToChip1(0x10 + (voiceNr >> 1), octaveData);
}
void MidiDriver_CMS::noteOn(int channel, int note, int velocity) {
if (note < 21 || note > 116)
return;
if (velocity == 0) {
noteOff(channel, note);
return;
}
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channel && _voice[i].note == note) {
_voice[i].sustained = 0;
voiceOff(i);
voiceOn(i, note, velocity);
return;
}
}
#ifdef CMS_DISABLE_VOICE_MAPPING
int voice = findVoiceBasic(channel);
#else
int voice = findVoice(channel);
#endif
if (voice != -1)
voiceOn(voice, note, velocity);
}
int MidiDriver_CMS::findVoiceBasic(int channel) {
int voice = -1;
int oldestVoice = -1;
int oldestAge = -1;
// Try to find a voice assigned to this channel that is free (round-robin)
for (int i = 0; i < ARRAYSIZE(_voice); i++) {
int v = (_channel[channel].lastVoiceUsed + i + 1) % ARRAYSIZE(_voice);
if (_voice[v].note == 0xFF) {
voice = v;
break;
}
// We also keep track of the oldest note in case the search fails
if (_voice[v].ticks > oldestAge) {
oldestAge = _voice[v].ticks;
oldestVoice = v;
}
}
if (voice == -1) {
if (oldestVoice >= 0) {
voiceOff(oldestVoice);
voice = oldestVoice;
} else {
return -1;
}
}
_voice[voice].channel = channel;
_channel[channel].lastVoiceUsed = voice;
return voice;
}
void MidiDriver_CMS::noteOff(int channel, int note) {
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channel && _voice[i].note == note) {
if (_channel[channel].hold != 0)
_voice[i].sustained = true;
else
_voice[i].turnOff = true;
}
}
}
void MidiDriver_CMS::controlChange(int channel, int control, int value) {
switch (control) {
case 7:
if (value) {
value >>= 3;
if (!value)
++value;
}
_channel[channel].volume = value;
break;
case 10:
_channel[channel].pan = value;
break;
case 64:
_channel[channel].hold = value;
if (!value) {
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channel && _voice[i].sustained) {
_voice[i].sustained = 0;
_voice[i].turnOff = true;
}
}
}
break;
case 75:
#ifndef CMS_DISABLE_VOICE_MAPPING
voiceMapping(channel, value);
#endif
break;
case 123:
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channel && _voice[i].note != 0xFF)
voiceOff(i);
}
break;
default:
return;
}
}
void MidiDriver_CMS::pitchWheel(int channelNr, int value) {
Channel &channel = _channel[channelNr];
channel.pitchWheel = value;
channel.pitchAdditive = false;
channel.pitchModifier = 0;
if (value < 0x2000) {
channel.pitchModifier = (0x2000 - value) / 170;
} else if (value > 0x2000) {
channel.pitchModifier = (value - 0x2000) / 170;
channel.pitchAdditive = true;
}
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channelNr && _voice[i].note != 0xFF)
noteSend(i);
}
}
void MidiDriver_CMS::voiceMapping(int channelNr, int value) {
int curVoices = 0;
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channelNr)
++curVoices;
}
curVoices += _channel[channelNr].extraVoices;
if (curVoices == value) {
return;
} else if (curVoices < value) {
bindVoices(channelNr, value - curVoices);
} else {
unbindVoices(channelNr, curVoices - value);
donateVoices();
}
}
void MidiDriver_CMS::bindVoices(int channel, int voices) {
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == 0xFF)
continue;
Voice &voice = _voice[i];
voice.channel = channel;
if (voice.note != 0xFF)
voiceOff(i);
--voices;
if (voices == 0)
break;
}
_channel[channel].extraVoices += voices;
// The original called "PatchChange" here, since this just
// copies the value of _channel[channel].patch to itself
// it is left out here though.
}
void MidiDriver_CMS::unbindVoices(int channelNr, int voices) {
Channel &channel = _channel[channelNr];
if (channel.extraVoices >= voices) {
channel.extraVoices -= voices;
} else {
voices -= channel.extraVoices;
channel.extraVoices = 0;
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == channelNr
&& _voice[i].note == 0xFF) {
--voices;
if (voices == 0)
return;
}
}
do {
uint16 voiceTime = 0;
uint voiceNr = 0;
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel != channelNr)
continue;
uint16 curTime = _voice[i].turnOffTicks;
if (curTime)
curTime += 0x8000;
else
curTime = _voice[i].ticks;
if (curTime >= voiceTime) {
voiceNr = i;
voiceTime = curTime;
}
}
_voice[voiceNr].sustained = 0;
voiceOff(voiceNr);
_voice[voiceNr].channel = 0xFF;
--voices;
} while (voices != 0);
}
}
void MidiDriver_CMS::donateVoices() {
int freeVoices = 0;
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].channel == 0xFF)
++freeVoices;
}
if (!freeVoices)
return;
for (uint i = 0; i < ARRAYSIZE(_channel); ++i) {
Channel &channel = _channel[i];
if (!channel.extraVoices) {
continue;
} else if (channel.extraVoices < freeVoices) {
freeVoices -= channel.extraVoices;
channel.extraVoices = 0;
bindVoices(i, channel.extraVoices);
} else {
channel.extraVoices -= freeVoices;
bindVoices(i, freeVoices);
return;
}
}
}
int MidiDriver_CMS::findVoice(int channelNr) {
Channel &channel = _channel[channelNr];
int voiceNr = channel.lastVoiceUsed;
int newVoice = 0;
uint16 newVoiceTime = 0;
bool loopDone = false;
do {
++voiceNr;
if (voiceNr == 12)
voiceNr = 0;
Voice &voice = _voice[voiceNr];
if (voiceNr == channel.lastVoiceUsed)
loopDone = true;
if (voice.channel == channelNr) {
if (voice.note == 0xFF) {
channel.lastVoiceUsed = voiceNr;
return voiceNr;
}
uint16 curTime = voice.turnOffTicks;
if (curTime)
curTime += 0x8000;
else
curTime = voice.ticks;
if (curTime >= newVoiceTime) {
newVoice = voiceNr;
newVoiceTime = curTime;
}
}
} while (!loopDone);
if (newVoiceTime > 0) {
voiceNr = newVoice;
_voice[voiceNr].sustained = 0;
voiceOff(voiceNr);
channel.lastVoiceUsed = voiceNr;
return voiceNr;
} else {
return -1;
}
}
void MidiDriver_CMS::updateVoiceAmplitude(int voiceNr) {
Voice &voice = _voice[voiceNr];
if (voice.amplitudeTimer != 0 && voice.amplitudeTimer != 254) {
--voice.amplitudeTimer;
return;
} else if (voice.amplitudeTimer == 254) {
if (!voice.turnOff)
return;
voice.amplitudeTimer = 0;
}
int nextDataIndex = voice.patchDataIndex;
uint8 timerData = 0;
uint8 amplitudeData = voice.patchDataPtr[nextDataIndex];
if (amplitudeData == 255) {
timerData = amplitudeData = 0;
voiceOff(voiceNr);
} else {
timerData = voice.patchDataPtr[nextDataIndex + 1];
nextDataIndex += 2;
}
voice.patchDataIndex = nextDataIndex;
voice.amplitudeTimer = timerData;
voice.amplitudeModifier = amplitudeData;
}
void MidiDriver_CMS::setupVoiceAmplitude(int voiceNr) {
Voice &voice = _voice[voiceNr];
uint amplitude = 0;
if (_channel[voice.channel].volume && voice.velocity
&& voice.amplitudeModifier && _masterVolume) {
amplitude = _channel[voice.channel].volume * voice.velocity;
amplitude /= 0x0F;
amplitude *= voice.amplitudeModifier;
amplitude /= 0x0F;
amplitude *= _masterVolume;
amplitude /= 0x0F;
if (!amplitude)
++amplitude;
}
uint8 amplitudeData = 0;
int pan = _channel[voice.channel].pan >> 2;
if (pan >= 16) {
amplitudeData = (amplitude * (31 - pan) / 0x0F) & 0x0F;
amplitudeData |= (amplitude << 4);
} else {
amplitudeData = (amplitude * pan / 0x0F) & 0x0F;
amplitudeData <<= 4;
amplitudeData |= amplitude;
}
if (!_playSwitch)
amplitudeData = 0;
if (voiceNr >= 6)
writeToChip2(voiceNr - 6, amplitudeData);
else
writeToChip1(voiceNr, amplitudeData);
}
void MidiDriver_CMS::generateSamples(int16 *buffer, int len) {
while (len) {
if (!_samplesTillCallback) {
for (uint i = 0; i < ARRAYSIZE(_voice); ++i) {
if (_voice[i].note == 0xFF)
continue;
++_voice[i].ticks;
if (_voice[i].turnOff)
++_voice[i].turnOffTicks;
updateVoiceAmplitude(i);
setupVoiceAmplitude(i);
}
_samplesTillCallback = _samplesPerCallback;
_samplesTillCallbackRemainder += _samplesPerCallbackRemainder;
if (_samplesTillCallbackRemainder >= _timerFreq) {
_samplesTillCallback++;
_samplesTillCallbackRemainder -= _timerFreq;
}
}
int32 render = MIN<int32>(len, _samplesTillCallback);
len -= render;
_samplesTillCallback -= render;
_cms->readBuffer(buffer, render);
buffer += render * 2;
}
}
class MidiPlayer_CMS : public MidiPlayer {
public:
MidiPlayer_CMS(SciVersion version) : MidiPlayer(version) {
}
int open(ResourceManager *resMan) {
if (_driver)
return MidiDriver::MERR_ALREADY_OPEN;
_driver = new MidiDriver_CMS(g_system->getMixer(), resMan);
int driverRetVal = _driver->open();
if (driverRetVal != 0)
return driverRetVal;
return 0;
}
void close() {
_driver->setTimerCallback(0, 0);
_driver->close();
delete _driver;
_driver = nullptr;
}
bool hasRhythmChannel() const { return false; }
byte getPlayId() const { return 9; }
int getPolyphony() const { return 12; }
void playSwitch(bool play) { static_cast<MidiDriver_CMS *>(_driver)->playSwitch(play); }
};
MidiPlayer *MidiPlayer_CMS_create(SciVersion version) {
return new MidiPlayer_CMS(version);
}
} // End of namespace SCI
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