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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"
namespace Scumm {
Player_V3M::Player_V3M(ScummEngine *scumm, Audio::Mixer *mixer)
: Player_Mac(scumm, mixer, 5, 0x1E) {
assert(_vm->_game.id == GID_LOOM);
// 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.
}
// \xAA is a trademark glyph in Mac OS Roman. We try that, but also the Windows
// version, the UTF-8 version, and just plain without in case the file system
// can't handle exotic characters like that.
static const char *loomFileNames[] = {
"Loom\xAA",
"Loom\x99",
"Loom\xE2\x84\xA2",
"Loom"
};
bool Player_V3M::checkMusicAvailable() {
Common::MacResManager resource;
bool found = false;
for (int i = 0; i < ARRAYSIZE(loomFileNames); i++) {
if (resource.exists(loomFileNames[i])) {
found = true;
break;
}
}
if (!found) {
GUI::MessageDialog dialog(_(
"Could not find the 'Loom' Macintosh executable to read the\n"
"instruments from. Music will be disabled."), _("OK"));
dialog.runModal();
return false;
}
return true;
}
bool Player_V3M::loadMusic(const byte *ptr) {
Common::MacResManager resource;
bool found = false;
for (int i = 0; i < ARRAYSIZE(loomFileNames); i++) {
if (resource.open(loomFileNames[i])) {
found = true;
break;
}
}
if (!found) {
return false;
}
assert(ptr[4] == 's' && ptr[5] == 'o');
uint i;
for (i = 0; i < 5; i++) {
int instrument = READ_BE_UINT16(ptr + 20 + 2 * i);
int offset = READ_BE_UINT16(ptr + 30 + 2 * i);
_channel[i]._looped = false;
_channel[i]._length = READ_BE_UINT16(ptr + offset + 4) * 3;
_channel[i]._data = ptr + 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::loadMusic: Channel %d - Loaded Instrument %d (%s)", i, instrument, resource.getResName(RES_SND, instrument).c_str());
} else {
resource.close();
return false;
}
}
resource.close();
return true;
}
bool Player_V3M::getNextNote(int ch, uint32 &samples, int &pitchModifier, byte &velocity) {
_channel[ch]._instrument.newNote();
if (_channel[ch]._pos >= _channel[ch]._length) {
if (!_channel[ch]._looped) {
_channel[ch]._notesLeft = false;
return false;
}
_channel[ch]._pos = 0;
}
uint16 duration = READ_BE_UINT16(&_channel[ch]._data[_channel[ch]._pos]);
byte note = _channel[ch]._data[_channel[ch]._pos + 2];
samples = durationToSamples(duration);
if (note > 0) {
pitchModifier = noteToPitchModifier(note, &_channel[ch]._instrument);
velocity = 127;
} else {
pitchModifier = 0;
velocity = 0;
}
_channel[ch]._pos += 3;
return true;
}
} // End of namespace Scumm
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