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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.
*
*/
/*
We have the following information from Lars Christensen (lechimp) and
Jamieson Christian (jamieson630):
RESOURCE DATA
LE 2 bytes Resource size
2 bytes Unknown
2 bytes 'so'
14 bytes Unknown
BE 2 bytes Instrument for Stream 1
BE 2 bytes Instrument for Stream 2
BE 2 bytes Instrument for Stream 3
BE 2 bytes Instrument for Stream 4
BE 2 bytes Instrument for Stream 5
BE 2 bytes Offset to Stream 1
BE 2 bytes Offset to Stream 2
BE 2 bytes Offset to Stream 3
BE 2 bytes Offset to Stream 4
BE 2 bytes Offset to Stream 5
? bytes The streams
STREAM DATA
BE 2 bytes Unknown (always 1?)
2 bytes Unknown (always 0?)
BE 2 bytes Number of events in stream
? bytes Stream data
Each stream event is exactly 3 bytes, therefore one can
assert that numEvents == (streamSize - 6) / 3. The
polyphony of a stream appears to be 1; in other words, only
one note at a time can be playing in each stream. The next
event is not executed until the current note (or rest) is
finished playing; therefore, note duration also serves as the
time delta between events.
FOR EACH EVENTS
BE 2 bytes Note duration
1 byte Note number to play (0 = rest/silent)
Oh, and quick speculation -- Stream 1 may be used for a
single-voice interleaved version of the music, where Stream 2-
5 represent a version of the music in up to 4-voice
polyphony, one voice per stream. I postulate thus because
the first stream of the Mac Loom theme music contains
interleaved voices, whereas the second stream seemed to
contain only the pizzicato bottom-end harp. Stream 5, in this
example, is empty, so if my speculation is correct, this
particular musical number supports 3-voice polyphony at
most. I must check out Streams 3 and 4 to see what they
contain.
==========
The instruments appear to be identified by their resource IDs:
1000 Dual Harp
10895 harp1
11445 strings1
11548 silent
13811 staff1
15703 brass1
16324 flute1
25614 accordian 1
28110 f horn1
29042 bassoon1
*/
#include "common/macresman.h"
#include "common/translation.h"
#include "engines/engine.h"
#include "gui/message.h"
#include "scumm/player_v3m.h"
#include "scumm/scumm.h"
#define RES_SND MKTAG('s', 'n', 'd', ' ')
namespace Scumm {
Player_V3M::Player_V3M(ScummEngine *scumm, Audio::Mixer *mixer)
: _vm(scumm),
_mixer(mixer),
_sampleRate(_mixer->getOutputRate()),
_soundPlaying(-1) {
assert(scumm);
assert(mixer);
assert(_vm->_game.id == GID_LOOM);
int i;
for (i = 0; i < 5; i++) {
_channel[i]._looped = false;
_channel[i]._length = 0;
_channel[i]._data = NULL;
_channel[i]._pos = 0;
_channel[i]._pitchModifier = 0;
_channel[i]._velocity = 0;
_channel[i]._remaining = 0;
_channel[i]._notesLeft = false;
_channel[i]._instrument._data = NULL;
_channel[i]._instrument._size = 0;
_channel[i]._instrument._rate = 0;
_channel[i]._instrument._loopStart = 0;
_channel[i]._instrument._loopEnd = 0;
_channel[i]._instrument._baseFreq = 0;
_channel[i]._instrument._pos = 0;
_channel[i]._instrument._subPos = 0;
}
_pitchTable[116] = 1664510;
_pitchTable[117] = 1763487;
_pitchTable[118] = 1868350;
_pitchTable[119] = 1979447;
_pitchTable[120] = 2097152;
_pitchTable[121] = 2221855;
_pitchTable[122] = 2353973;
_pitchTable[123] = 2493948;
_pitchTable[124] = 2642246;
_pitchTable[125] = 2799362;
_pitchTable[126] = 2965820;
_pitchTable[127] = 3142177;
for (i = 115; i >= 0; --i) {
_pitchTable[i] = _pitchTable[i + 12] / 2;
}
setMusicVolume(255);
Common::MacResManager resource;
// \252 is a trademark glyph. I don't think we should assume that it
// will be preserved when copying from the Mac disk.
if (!resource.exists("Loom\252") && !resource.exists("Loom")) {
GUI::MessageDialog dialog(_(
"Could not find the 'Loom' Macintosh executable to read the\n"
"instruments from. Music will be disabled."), _("OK"));
dialog.runModal();
return;
}
_mixer->playStream(Audio::Mixer::kPlainSoundType, &_soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
}
Player_V3M::~Player_V3M() {
Common::StackLock lock(_mutex);
_mixer->stopHandle(_soundHandle);
stopAllSounds_Internal();
}
void Player_V3M::setMusicVolume(int vol) {
debug(5, "Player_V3M::setMusicVolume(%d)", vol);
}
void Player_V3M::stopAllSounds_Internal() {
_soundPlaying = -1;
for (int i = 0; i < 3; i++) {
// The channel data is managed by the resource manager, so
// don't delete that.
delete[] _channel[i]._instrument._data;
_channel[i]._instrument._data = NULL;
_channel[i]._remaining = 0;
_channel[i]._notesLeft = false;
}
}
void Player_V3M::stopAllSounds() {
Common::StackLock lock(_mutex);
debug(5, "Player_V3M::stopAllSounds()");
stopAllSounds_Internal();
}
void Player_V3M::stopSound(int nr) {
Common::StackLock lock(_mutex);
debug(5, "Player_V3M::stopSound(%d)", nr);
if (nr == _soundPlaying) {
stopAllSounds();
}
}
void Player_V3M::startSound(int nr) {
Common::StackLock lock(_mutex);
debug(5, "Player_V3M::startSound(%d)", nr);
Common::MacResManager resource;
if (!resource.open("Loom\252") && !resource.open("Loom")) {
return;
}
const byte *ptr = _vm->getResourceAddress(rtSound, nr);
assert(ptr);
const byte *src = ptr;
uint i;
assert(src[4] == 's' && src[5] == 'o');
for (i = 0; i < 5; i++) {
int instrument = READ_BE_UINT16(src + 20 + 2 * i);
int offset = READ_BE_UINT16(src + 30 + 2 * i);
_channel[i]._looped = false;
_channel[i]._length = READ_BE_UINT16(src + offset + 4) * 3;
_channel[i]._data = src + offset + 6;
_channel[i]._pos = 0;
_channel[i]._pitchModifier = 0;
_channel[i]._velocity = 0;
_channel[i]._remaining = 0;
_channel[i]._notesLeft = true;
Common::SeekableReadStream *stream = resource.getResource(RES_SND, instrument);
if (_channel[i].loadInstrument(stream)) {
debug(6, "Player_V3M::startSound: Channel %d - Loaded Instrument %d (%s)", i, instrument, resource.getResName(RES_SND, instrument).c_str());
} else {
resource.close();
return;
}
}
resource.close();
_soundPlaying = nr;
}
bool Player_V3M::Channel::loadInstrument(Common::SeekableReadStream *stream) {
// Load the sound
uint16 soundType = stream->readUint16BE();
if (soundType != 1) {
warning("Player_V3M::loadInstrument: Unsupported sound type %d", soundType);
return false;
}
uint16 typeCount = stream->readUint16BE();
if (typeCount != 1) {
warning("Player_V3M::loadInstrument: Unsupported data type count %d", typeCount);
return false;
}
uint16 dataType = stream->readUint16BE();
if (dataType != 5) {
warning("Player_V3M::loadInstrument: Unsupported data type %d", dataType);
return false;
}
stream->readUint32BE(); // initialization option
uint16 cmdCount = stream->readUint16BE();
if (cmdCount != 1) {
warning("Player_V3M::loadInstrument: Unsupported command count %d", cmdCount);
return false;
}
uint16 command = stream->readUint16BE();
if (command != 0x8050 && command != 0x8051) {
warning("Player_V3M::loadInstrument: Unsupported command 0x%04X", command);
return false;
}
stream->readUint16BE(); // 0
uint32 soundHeaderOffset = stream->readUint32BE();
stream->seek(soundHeaderOffset);
uint32 soundDataOffset = stream->readUint32BE();
uint32 size = stream->readUint32BE();
uint32 rate = stream->readUint32BE() >> 16;
uint32 loopStart = stream->readUint32BE();
uint32 loopEnd = stream->readUint32BE();
byte encoding = stream->readByte();
byte baseFreq = stream->readByte();
if (encoding != 0) {
warning("Player_V3M::loadInstrument: Unsupported encoding %d", encoding);
return false;
}
stream->skip(soundDataOffset);
byte *data = new byte[size];
stream->read(data, size);
_instrument._data = data;
_instrument._size = size;
_instrument._rate = rate;
_instrument._loopStart = loopStart;
_instrument._loopEnd = loopEnd;
_instrument._baseFreq = baseFreq;
return true;
}
int Player_V3M::getMusicTimer() {
return 0;
}
int Player_V3M::getSoundStatus(int nr) const {
return _soundPlaying == nr;
}
int Player_V3M::readBuffer(int16 *data, const int numSamples) {
Common::StackLock lock(_mutex);
memset(data, 0, numSamples * 2);
if (_soundPlaying == -1) {
return numSamples;
}
bool notesLeft = false;
// Channel 0 seems to be what was played on low-end macs, that couldn't
// handle multi-channel music and play the game at the same time. I'm
// not sure if stream 4 is ever used, but let's use it just in case.
for (int i = 1; i < 5; i++) {
uint samplesLeft = numSamples;
int16 *ptr = data;
while (samplesLeft > 0) {
int generated;
if (_channel[i]._remaining == 0) {
uint16 duration;
byte note, velocity;
if (_channel[i].getNextNote(duration, note, velocity)) {
if (note > 0) {
const int pitchIdx = note + 60 - _channel[i]._instrument._baseFreq;
assert(pitchIdx >= 0);
// I don't want to use floating-point arithmetics here,
// but I ran into overflow problems with the church
// music. It's only once per note, so it should be ok.
double mult = (double)(_channel[i]._instrument._rate) / (double)_sampleRate;
_channel[i]._pitchModifier = mult * _pitchTable[pitchIdx];
_channel[i]._velocity = velocity;
} else {
_channel[i]._pitchModifier = 0;
_channel[i]._velocity = 0;
}
// The correct formula should be:
//
// (duration * 473 * _sampleRate) / (4 * 480 * 480)
//
// But that's likely to cause integer overflow, so
// we do it in two steps and hope that the rounding
// error won't be noticeable.
//
// The original code is a bit unclear on if it should
// be 473 or 437, but since the comments indicated
// 473 I'm assuming 437 was a typo.
_channel[i]._remaining = (duration * _sampleRate) / (4 * 480);
_channel[i]._remaining = (_channel[i]._remaining * 473) / 480;
} else {
_channel[i]._pitchModifier = 0;
_channel[i]._velocity = 0;
_channel[i]._remaining = samplesLeft;
}
}
generated = MIN(_channel[i]._remaining, samplesLeft);
if (_channel[i]._velocity != 0) {
_channel[i]._instrument.generateSamples(ptr, _channel[i]._pitchModifier, _channel[i]._velocity, generated);
}
ptr += generated;
samplesLeft -= generated;
_channel[i]._remaining -= generated;
}
if (_channel[i]._notesLeft) {
notesLeft = true;
}
}
if (!notesLeft) {
stopAllSounds_Internal();
}
return numSamples;
}
bool Player_V3M::Channel::getNextNote(uint16 &duration, byte ¬e, byte &velocity) {
_instrument.newNote();
if (_pos >= _length) {
if (!_looped) {
_notesLeft = false;
return false;
}
_pos = 0;
}
duration = READ_BE_UINT16(&_data[_pos]);
note = _data[_pos + 2];
velocity = 127;
_pos += 3;
return true;
}
void Player_V3M::Instrument::generateSamples(int16 *data, int pitchModifier, int volume, int numSamples) {
int samplesLeft = numSamples;
while (samplesLeft) {
_subPos += pitchModifier;
while (_subPos >= 0x10000) {
_subPos -= 0x10000;
_pos++;
if (_pos >= _loopEnd) {
_pos = _loopStart;
}
}
int sample = *data + ((_data[_pos] - 129) * 128 * volume) / 255;
if (sample > 32767) {
sample = 32767;
} else if (sample < -32768) {
sample = -32768;
}
*data++ = sample; // (_data[_pos] * 127) / 100;
samplesLeft--;
}
}
} // End of namespace Scumm
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