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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 "kyra/sound/sound_intern.h"
#include "audio/mixer.h"
#include "audio/softsynth/pcspk.h"
namespace Kyra {
MidiDriver_PCSpeaker::MidiDriver_PCSpeaker(Audio::Mixer *mixer)
: MidiDriver_Emulated(mixer), _rate(mixer->getOutputRate()) {
_timerValue = 0;
memset(_channel, 0, sizeof(_channel));
memset(_note, 0, sizeof(_note));
for (int i = 0; i < 2; ++i)
_note[i].hardwareChannel = 0xFF;
_speaker = new Audio::PCSpeaker(_rate);
assert(_speaker);
_mixer->playStream(Audio::Mixer::kMusicSoundType, &_mixerSoundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
_countdown = 0xFFFF;
_hardwareChannel[0] = 0xFF;
_modulationFlag = false;
}
MidiDriver_PCSpeaker::~MidiDriver_PCSpeaker() {
_mixer->stopHandle(_mixerSoundHandle);
delete _speaker;
_speaker = 0;
}
void MidiDriver_PCSpeaker::send(uint32 data) {
Common::StackLock lock(_mutex);
uint8 channel = data & 0x0F;
uint8 param1 = (data >> 8) & 0xFF;
uint8 param2 = (data >> 16) & 0xFF;
uint8 flags = 0x00;
if (channel > 1)
return;
switch (data & 0xF0) {
case 0x80: // note off
noteOff(channel, param1);
return;
case 0x90: // note on
if (channel > 1)
return;
if (param2)
noteOn(channel, param1);
else
noteOff(channel, param1);
return;
case 0xB0: // controller
switch (param1) {
case 0x01: // modulation
_channel[channel].modulation = param2;
break;
case 0x40: // hold
_channel[channel].hold = param2;
if (param2 < 0x40)
resetController(channel);
return;
case 0x70: // voice protect
_channel[channel].voiceProtect = param2;
return;
case 0x79: // all notes off
_channel[channel].hold = 0;
resetController(channel);
_channel[channel].modulation = 0;
_channel[channel].pitchBendLow = 0;
_channel[channel].pitchBendHigh = 0x40;
flags = 0x01;
break;
default:
return;
}
break;
case 0xE0: // pitch bend
flags = 0x01;
_channel[channel].pitchBendLow = param1;
_channel[channel].pitchBendHigh = param2;
break;
default:
return;
}
for (int i = 0; i < 2; ++i) {
if (_note[i].enabled && _note[i].midiChannel == channel) {
_note[i].flags |= flags;
setupTone(i);
}
}
}
void MidiDriver_PCSpeaker::resetController(int channel) {
for (int i = 0; i < 2; ++i) {
if (_note[i].enabled && _note[i].midiChannel == channel && _note[i].processHold)
noteOff(channel, _note[i].note);
}
}
void MidiDriver_PCSpeaker::noteOn(int channel, int note) {
int n = 0;
while (n < 2 && _note[n].enabled)
++n;
if (n >= 2)
return;
_note[n].midiChannel = channel;
_note[n].note = note;
_note[n].enabled = true;
_note[n].processHold = false;
_note[n].hardwareFlags = 0x20;
_note[n].priority = 0x7FFF;
_note[n].flags = 0x01;
turnNoteOn(n);
}
void MidiDriver_PCSpeaker::turnNoteOn(int note) {
if (_hardwareChannel[0] == 0xFF) {
_note[note].hardwareChannel = 0;
++_channel[_note[note].midiChannel].noteCount;
_hardwareChannel[0] = _note[note].midiChannel;
_note[note].flags = 0x01;
setupTone(note);
} else {
overwriteNote(note);
}
}
void MidiDriver_PCSpeaker::overwriteNote(int note) {
int totalNotes = 0;
for (int i = 0; i < 2; ++i) {
if (_note[i].enabled) {
++totalNotes;
const int channel = _note[i].midiChannel;
uint16 priority = 0xFFFF;
if (_channel[channel].voiceProtect < 0x40)
priority = _note[i].priority;
if (_channel[channel].noteCount > priority)
priority = 0;
else
priority -= _channel[channel].noteCount;
_note[i].precedence = priority;
}
}
if (totalNotes <= 1)
return;
do {
uint16 maxValue = 0;
uint16 minValue = 0xFFFF;
int newNote = 0;
for (int i = 0; i < 2; ++i) {
if (_note[i].enabled) {
if (_note[i].hardwareChannel == 0xFF) {
if (_note[i].precedence >= maxValue) {
maxValue = _note[i].precedence;
newNote = i;
}
} else {
if (_note[i].precedence <= minValue) {
minValue = _note[i].precedence;
note = i;
}
}
}
}
if (maxValue < minValue)
return;
turnNoteOff(_note[note].hardwareChannel);
_note[note].enabled = false;
_note[newNote].hardwareChannel = _note[note].hardwareChannel;
++_channel[_note[newNote].midiChannel].noteCount;
_hardwareChannel[_note[note].hardwareChannel] = _note[newNote].midiChannel;
_note[newNote].flags = 0x01;
setupTone(newNote);
} while (--totalNotes);
}
void MidiDriver_PCSpeaker::noteOff(int channel, int note) {
for (int i = 0; i < 2; ++i) {
if (_note[i].enabled && _note[i].note == note && _note[i].midiChannel == channel) {
if (_channel[i].hold < 0x40) {
turnNoteOff(i);
_note[i].enabled = false;
} else {
_note[i].processHold = true;
}
}
}
}
void MidiDriver_PCSpeaker::turnNoteOff(int note) {
if (_note[note].hardwareChannel != 0xFF) {
_note[note].hardwareFlags &= 0xDF;
_note[note].flags |= 1;
setupTone(note);
--_channel[_note[note].midiChannel].noteCount;
_hardwareChannel[_note[note].hardwareChannel] = 0xFF;
_note[note].hardwareChannel = 0xFF;
}
}
void MidiDriver_PCSpeaker::setupTone(int note) {
if (_note[note].hardwareChannel == 0xFF)
return;
if (!(_note[note].flags & 0x01))
return;
if (!(_note[note].hardwareFlags & 0x20)) {
_speaker->stop();
} else {
const int midiChannel = _note[note].midiChannel;
uint16 pitchBend = (_channel[midiChannel].pitchBendHigh << 7) | _channel[midiChannel].pitchBendLow;
int noteValue = _note[note].note;
noteValue -= 24;
do {
noteValue += 12;
} while (noteValue < 0);
noteValue += 12;
do {
noteValue -= 12;
} while (noteValue > 95);
int16 modulation = _note[note].modulation;
int tableIndex = MAX(noteValue - 12, 0);
uint16 note1 = (_noteTable2[tableIndex] << 8) | _noteTable1[tableIndex];
tableIndex = MIN(noteValue + 12, 95);
uint16 note2 = (_noteTable2[tableIndex] << 8) | _noteTable1[tableIndex];
uint16 note3 = (_noteTable2[noteValue] << 8) | _noteTable1[noteValue];
int32 countdown = pitchBend - 0x2000;
countdown += modulation;
if (countdown >= 0)
countdown *= (note2 - note3);
else
countdown *= (note3 - note1);
countdown /= 0x2000;
countdown += note3;
countdown = uint16(countdown & 0xFFFF);
if (countdown != _countdown)
_countdown = countdown;
_speaker->play(Audio::PCSpeaker::kWaveFormSquare, 1193180 / _countdown, -1);
}
_note[note].flags &= 0xFE;
}
void MidiDriver_PCSpeaker::generateSamples(int16 *buffer, int numSamples) {
Common::StackLock lock(_mutex);
_speaker->readBuffer(buffer, numSamples);
}
void MidiDriver_PCSpeaker::onTimer() {
/*Common::StackLock lock(_mutex);
_timerValue += 20;
if (_timerValue < 120)
return;
_timerValue -= 120;
_modulationFlag = !_modulationFlag;
for (int i = 0; i < 2; ++i) {
if (_note[i].enabled) {
uint16 modValue = 5 * _channel[_note[i].midiChannel].modulation;
if (_modulationFlag)
modValue = -modValue;
_note[i].modulation = modValue;
_note[i].flags |= 1;
setupTone(i);
}
}*/
}
const uint8 MidiDriver_PCSpeaker::_noteTable1[] = {
0x88, 0xB5, 0x4E, 0x40, 0x41, 0xCD, 0xC4, 0x3D,
0x43, 0x7C, 0x2A, 0xD6, 0x88, 0xB5, 0xFF, 0xD1,
0x20, 0xA7, 0xE2, 0x1E, 0xCE, 0xBE, 0xF2, 0x8A,
0x44, 0x41, 0x7F, 0xE8, 0x90, 0x63, 0x63, 0x8F,
0xE7, 0x5F, 0x01, 0xBD, 0xA2, 0xA0, 0xBF, 0xF4,
0x48, 0xB1, 0x31, 0xC7, 0x70, 0x2F, 0xFE, 0xE0,
0xD1, 0xD0, 0xDE, 0xFB, 0x24, 0x58, 0x98, 0xE3,
0x39, 0x97, 0xFF, 0x6F, 0xE8, 0x68, 0xEF, 0x7D,
0x11, 0xAC, 0x4C, 0xF1, 0x9C, 0x4B, 0xFF, 0xB7,
0x74, 0x34, 0xF7, 0xBE, 0x88, 0x56, 0x26, 0xF8,
0xCE, 0xA5, 0x7F, 0x5B, 0x3A, 0x1A, 0xFB, 0xDF,
0xC4, 0xAB, 0x93, 0x7C, 0x67, 0x52, 0x3F, 0x2D
};
const uint8 MidiDriver_PCSpeaker::_noteTable2[] = {
0x8E, 0x86, 0xFD, 0xF0, 0xE2, 0xD5, 0xC9, 0xBE,
0xB3, 0xA9, 0xA0, 0x96, 0x8E, 0x86, 0x7E, 0x77,
0x71, 0x6A, 0x64, 0x5F, 0x59, 0x54, 0x4F, 0x4B,
0x47, 0x43, 0x3F, 0x3B, 0x38, 0x35, 0x32, 0x2F,
0x2C, 0x2A, 0x28, 0x25, 0x23, 0x21, 0x1F, 0x1D,
0x1C, 0x1A, 0x19, 0x17, 0x16, 0x15, 0x13, 0x12,
0x11, 0x10, 0x0F, 0x0E, 0x0E, 0x0D, 0x0C, 0x0B,
0x0B, 0x0A, 0x09, 0x09, 0x08, 0x08, 0x07, 0x07,
0x07, 0x06, 0x06, 0x05, 0x05, 0x05, 0x04, 0x04,
0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
};
} // End of namespace Kyra
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