1 files changed, 275 insertions, 0 deletions
diff --git a/audio/mods/soundfx.cpp b/audio/mods/soundfx.cpp
new file mode 100644
index 0000000000..06a1e29514
--- /dev/null
+++ b/audio/mods/soundfx.cpp
@@ -0,0 +1,275 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/endian.h"
+
+#include "audio/mods/paula.h"
+#include "audio/mods/soundfx.h"
+#include "audio/audiostream.h"
+
+namespace Audio {
+
+struct SoundFxInstrument {
+	char name[23];
+	uint16 len;
+	uint8 finetune;
+	uint8 volume;
+	uint16 repeatPos;
+	uint16 repeatLen;
+	int8 *data;
+};
+
+class SoundFx : public Paula {
+public:
+
+	enum {
+		NUM_CHANNELS = 4,
+		NUM_INSTRUMENTS = 15
+	};
+
+	SoundFx(int rate, bool stereo);
+	virtual ~SoundFx();
+
+	bool load(Common::SeekableReadStream *data, LoadSoundFxInstrumentCallback loadCb);
+	void play();
+
+protected:
+
+	void handlePattern(int ch, uint32 pat);
+	void updateEffects(int ch);
+	void handleTick();
+
+	void disablePaulaChannel(uint8 channel);
+	void setupPaulaChannel(uint8 channel, const int8 *data, uint16 len, uint16 repeatPos, uint16 repeatLen);
+
+	virtual void interrupt();
+
+	uint8 _ticks;
+	uint16 _delay;
+	SoundFxInstrument _instruments[NUM_INSTRUMENTS];
+	uint8 _numOrders;
+	uint8 _curOrder;
+	uint16 _curPos;
+	uint8 _ordersTable[128];
+	uint8 *_patternData;
+	uint16 _effects[NUM_CHANNELS];
+};
+
+SoundFx::SoundFx(int rate, bool stereo)
+	: Paula(stereo, rate) {
+	setTimerBaseValue(kPalCiaClock);
+	_ticks = 0;
+	_delay = 0;
+	memset(_instruments, 0, sizeof(_instruments));
+	_numOrders = 0;
+	_curOrder = 0;
+	_curPos = 0;
+	memset(_ordersTable, 0, sizeof(_ordersTable));
+	_patternData = 0;
+	memset(_effects, 0, sizeof(_effects));
+}
+
+SoundFx::~SoundFx() {
+	free(_patternData);
+	for (int i = 0; i < NUM_INSTRUMENTS; ++i) {
+		free(_instruments[i].data);
+	}
+}
+
+bool SoundFx::load(Common::SeekableReadStream *data, LoadSoundFxInstrumentCallback loadCb) {
+	int instrumentsSize[15];
+	if (!loadCb) {
+		for (int i = 0; i < NUM_INSTRUMENTS; ++i) {
+			instrumentsSize[i] = data->readUint32BE();
+		}
+	}
+	uint8 tag[4];
+	data->read(tag, 4);
+	if (memcmp(tag, "SONG", 4) != 0) {
+		return false;
+	}
+	_delay = data->readUint16BE();
+	data->skip(7 * 2);
+	for (int i = 0; i < NUM_INSTRUMENTS; ++i) {
+		SoundFxInstrument *ins = &_instruments[i];
+		data->read(ins->name, 22); ins->name[22] = 0;
+		ins->len = data->readUint16BE();
+		ins->finetune = data->readByte();
+		ins->volume = data->readByte();
+		ins->repeatPos = data->readUint16BE();
+		ins->repeatLen = data->readUint16BE();
+	}
+	_numOrders = data->readByte();
+	data->skip(1);
+	data->read(_ordersTable, 128);
+	int maxOrder = 0;
+	for (int i = 0; i < _numOrders; ++i) {
+		if (_ordersTable[i] > maxOrder) {
+			maxOrder = _ordersTable[i];
+		}
+	}
+	int patternSize = (maxOrder + 1) * 4 * 4 * 64;
+	_patternData = (uint8 *)malloc(patternSize);
+	if (!_patternData) {
+		return false;
+	}
+	data->read(_patternData, patternSize);
+	for (int i = 0; i < NUM_INSTRUMENTS; ++i) {
+		SoundFxInstrument *ins = &_instruments[i];
+		if (!loadCb) {
+			if (instrumentsSize[i] != 0) {
+				assert(ins->len <= 1 || ins->len * 2 <= instrumentsSize[i]);
+				assert(ins->repeatLen <= 1 || (ins->repeatPos + ins->repeatLen) * 2 <= instrumentsSize[i]);
+				ins->data = (int8 *)malloc(instrumentsSize[i]);
+				if (!ins->data) {
+					return false;
+				}
+				data->read(ins->data, instrumentsSize[i]);
+			}
+		} else {
+			if (ins->name[0]) {
+				ins->name[8] = '\0';
+				ins->data = (int8 *)(*loadCb)(ins->name, 0);
+				if (!ins->data) {
+					return false;
+				}
+			}
+		}
+	}
+	return true;
+}
+
+void SoundFx::play() {
+	_curPos = 0;
+	_curOrder = 0;
+	_ticks = 0;
+	setInterruptFreqUnscaled(_delay);
+	startPaula();
+}
+
+void SoundFx::handlePattern(int ch, uint32 pat) {
+	uint16 note1 = pat >> 16;
+	uint16 note2 = pat & 0xFFFF;
+	if (note1 == 0xFFFD) { // PIC
+		_effects[ch] = 0;
+		return;
+	}
+	_effects[ch] = note2;
+	if (note1 == 0xFFFE) { // STP
+		disablePaulaChannel(ch);
+		return;
+	}
+	int ins = (note2 & 0xF000) >> 12;
+	if (ins != 0) {
+		SoundFxInstrument *i = &_instruments[ins - 1];
+		setupPaulaChannel(ch, i->data, i->len, i->repeatPos, i->repeatLen);
+		int effect = (note2 & 0xF00) >> 8;
+		int volume = i->volume;
+		switch (effect) {
+		case 5: // volume up
+			volume += (note2 & 0xFF);
+			if (volume > 63) {
+				volume = 63;
+			}
+			break;
+		case 6: // volume down
+			volume -= (note2 & 0xFF);
+			if (volume < 0) {
+				volume = 0;
+			}
+			break;
+		}
+		setChannelVolume(ch, volume);
+	}
+	if (note1 != 0) {
+		setChannelPeriod(ch, note1);
+	}
+}
+
+void SoundFx::updateEffects(int ch) {
+	// updateEffects() is a no-op in all Delphine Software games using SoundFx : FW,OS,Cruise,AW
+	if (_effects[ch] != 0) {
+		switch (_effects[ch]) {
+		case 1: // appreggiato
+		case 2: // pitchbend
+		case 3: // ledon, enable low-pass filter
+		case 4: // ledoff, disable low-pass filter
+		case 7: // set step up
+		case 8: // set step down
+			warning("Unhandled effect %d", _effects[ch]);
+			break;
+		}
+	}
+}
+
+void SoundFx::handleTick() {
+	++_ticks;
+	if (_ticks != 6) {
+		for (int ch = 0; ch < 4; ++ch) {
+			updateEffects(ch);
+		}
+	} else {
+		_ticks = 0;
+		const uint8 *patternData = _patternData + _ordersTable[_curOrder] * 1024 + _curPos;
+		for (int ch = 0; ch < 4; ++ch) {
+			handlePattern(ch, READ_BE_UINT32(patternData));
+			patternData += 4;
+		}
+		_curPos += 4 * 4;
+		if (_curPos >= 1024) {
+			_curPos = 0;
+			++_curOrder;
+			if (_curOrder == _numOrders) {
+				stopPaula();
+			}
+		}
+	}
+}
+
+void SoundFx::disablePaulaChannel(uint8 channel) {
+	disableChannel(channel);
+}
+
+void SoundFx::setupPaulaChannel(uint8 channel, const int8 *data, uint16 len, uint16 repeatPos, uint16 repeatLen) {
+	if (data && len > 1) {
+		setChannelData(channel, data, data + repeatPos * 2, len * 2, repeatLen * 2);
+	}
+}
+
+void SoundFx::interrupt() {
+	handleTick();
+}
+
+AudioStream *makeSoundFxStream(Common::SeekableReadStream *data, LoadSoundFxInstrumentCallback loadCb, int rate, bool stereo) {
+	SoundFx *stream = new SoundFx(rate, stereo);
+	if (stream->load(data, loadCb)) {
+		stream->play();
+		return stream;
+	}
+	delete stream;
+	return 0;
+}
+
+} // End of namespace Audio