changed structure of musicdriver, added General Midi music support.

mapping table mt32->gm needs a lot of changes.

svn-id: r7273

1 files changed, 201 insertions, 0 deletions

diff --git a/sky/gmchannel.cpp b/sky/gmchannel.cpp
new file mode 100644
index 0000000000..6383427c0d
--- /dev/null
+++ b/sky/gmchannel.cpp
@@ -0,0 +1,201 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#include "gmchannel.h"
+
+// instrument map copied from scumm/instrument.cpp
+
+const byte SkyGmChannel::_mt32_to_gm[128] = {
+//    0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
+	  0,   1,   0,   2,   4,   4,   5,   3,  16,  17,  18,  16,  16,  19,  20,  21, // 0x
+	  6,   6,   6,   7,   7,   7,   8, 112,  62,  62,  63,  63,  38,  38,  39,  39, // 1x
+	 88,  95,  52,  98,  97,  99,  14,  54, 102,  96,  53, 102,  81, 100,  14,  80, // 2x
+	 48,  48,  49,  45,  41,  40,  42,  42,  43,  46,  45,  24,  25,  28,  27, 104, // 3x
+	 32,  32,  34,  33,  36,  37,  35,  35,  79,  73,  72,  72,  74,  75,  64,  65, // 4x
+	 66,  67,  71,  71,  68,  69,  70,  22,  56,  59,  57,  57,  60,  60,  58,  61, // 5x
+	 61,  11,  11,  98,  14,   9,  14,  13,  12, 107, 107,  77,  78,  78,  76,  76, // 6x
+	 47, 117, 127, 118, 118, 116, 115, 119, 115, 112,  55, 124, 123,   0,  14, 117  // 7x
+};
+
+SkyGmChannel::SkyGmChannel(uint8 *pMusicData, uint16 startOfData, MidiDriver *pMidiDrv)
+{
+	_musicData = pMusicData;
+	_midiDrv = pMidiDrv;
+	_channelData.startOfData = startOfData;
+	_channelData.eventDataPtr = startOfData;
+	_channelData.channelActive = 1;
+	_channelData.nextEventTime = getNextEventTime();
+
+	_musicVolume = 0x100;
+}
+
+void SkyGmChannel::updateVolume(uint16 pVolume) {
+
+	_musicVolume = pVolume;
+}
+
+void SkyGmChannel::stopNote(void) {
+
+	_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x7B00 | 0 | 0x79000000);
+	_midiDrv->send(0);
+}
+
+int32 SkyGmChannel::getNextEventTime(void)
+{
+	int32 retV = 0; 
+	uint8 cnt, lVal;
+	for (cnt = 0; cnt < 4; cnt++) {
+		lVal = _musicData[_channelData.eventDataPtr];
+		_channelData.eventDataPtr++;
+		retV = (retV << 7) | (lVal & 0x7F);
+		if (!(lVal & 0x80)) break;
+	}
+	if (lVal & 0x80) { // should never happen
+		return -1;
+	} else return retV;
+
+}
+
+uint8 SkyGmChannel::process(uint16 aktTime) {
+
+	if (!_channelData.channelActive)
+		return 0;
+	
+	uint8 returnVal = 0;
+
+	_channelData.nextEventTime -= aktTime;
+	uint8 opcode;
+
+	while ((_channelData.nextEventTime < 0) && (_channelData.channelActive)) {
+		opcode = _musicData[_channelData.eventDataPtr];
+		_channelData.eventDataPtr++;
+		if (opcode&0x80) {
+			if (opcode == 0xFF) {
+				// dummy opcode
+			} else if (opcode >= 0x90) {
+				switch (opcode&0xF) {
+					case 0: com90_caseNoteOff(); break;
+					case 1: com90_stopChannel(); break;
+					case 2: com90_setupInstrument(); break;
+					case 3: 
+						returnVal = com90_updateTempo();
+						break;
+					case 5: com90_getPitch(); break;
+					case 6: com90_getChannelVolume(); break;
+					case 8: com90_rewindMusic(); break;
+					case 9: com90_keyOff(); break;
+					case 11: com90_getChannelPanValue(); break;
+					case 12: com90_setStartOfData(); break;
+					case 13: com90_getChannelControl(); break;
+					case 4: //com90_dummy();
+					case 7: //com90_skipTremoVibro();
+					case 10: //com90_error();
+						error("SkyChannel: dummy music routine 0x%02X was called",opcode);
+						_channelData.channelActive = 0;
+						break;
+					default:
+						// these opcodes aren't implemented in original music driver
+						error("SkyChannel: Not existant routine 0x%02X was called",opcode);
+						_channelData.channelActive = 0;
+						break;
+				}
+			} else {
+				// new midi channel assignment
+				_channelData.midiChannelNumber = opcode&0xF;
+			}
+		} else {
+			_channelData.note = opcode;
+			_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (opcode << 8) | (_musicData[_channelData.eventDataPtr] << 16));
+			_channelData.eventDataPtr++;
+		}
+		if (_channelData.channelActive)
+			_channelData.nextEventTime += getNextEventTime();
+	}
+	return returnVal;
+}
+
+//- command 90h routines
+
+void SkyGmChannel::com90_caseNoteOff(void) {
+
+	_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (_musicData[_channelData.eventDataPtr] << 8));
+	_channelData.eventDataPtr++;
+}
+
+void SkyGmChannel::com90_stopChannel(void) {
+
+	stopNote();
+	_channelData.channelActive = 0;
+}
+
+void SkyGmChannel::com90_setupInstrument(void) {
+
+	_midiDrv->send((0xC0 | _channelData.midiChannelNumber) | (_mt32_to_gm[_musicData[_channelData.eventDataPtr]] << 8));
+	_channelData.eventDataPtr++;
+}
+
+uint8 SkyGmChannel::com90_updateTempo(void) {
+
+	uint8 retV = _musicData[_channelData.eventDataPtr];
+	_channelData.eventDataPtr++;
+	return retV;
+}
+
+void SkyGmChannel::com90_getPitch(void) {
+
+	_midiDrv->send((0xE0 | _channelData.midiChannelNumber) | 0 | (_musicData[_channelData.eventDataPtr] << 16));
+	_channelData.eventDataPtr++;
+}
+
+void SkyGmChannel::com90_getChannelVolume(void) {
+
+	_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x700 | (_musicData[_channelData.eventDataPtr] << 16));
+	_channelData.eventDataPtr++;
+}
+
+void SkyGmChannel::com90_rewindMusic(void) {
+
+	_channelData.eventDataPtr = _channelData.startOfData;
+}
+
+void SkyGmChannel::com90_keyOff(void) {
+
+	_midiDrv->send((0x90 | _channelData.midiChannelNumber) | (_channelData.note << 8) | 0);
+}
+
+void SkyGmChannel::com90_setStartOfData(void) {
+
+	_channelData.startOfData = _channelData.eventDataPtr;
+}
+
+void SkyGmChannel::com90_getChannelPanValue(void) {
+
+	_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | 0x0A00 | (_musicData[_channelData.eventDataPtr] << 16));
+	_channelData.eventDataPtr++;
+}
+
+void SkyGmChannel::com90_getChannelControl(void) {
+
+	uint8 conNum = _musicData[_channelData.eventDataPtr];
+	uint8 conDat = _musicData[_channelData.eventDataPtr + 1];
+	_channelData.eventDataPtr += 2;
+	_midiDrv->send((0xB0 | _channelData.midiChannelNumber) | (conNum << 8) | (conDat << 16));
+}