diff options
Diffstat (limited to 'engines/m4/midi.cpp')
| -rw-r--r-- | engines/m4/midi.cpp | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/engines/m4/midi.cpp b/engines/m4/midi.cpp deleted file mode 100644 index bfe77828da..0000000000 --- a/engines/m4/midi.cpp +++ /dev/null @@ -1,256 +0,0 @@ -/* 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. - * - */ - -// FIXME: This is cribbed together from the SAGA music player. It needs cleanup -// and testing. - -#include "m4/m4.h" -#include "m4/midi.h" -#include "audio/midiparser.h" -#include "common/config-manager.h" -#include "common/memstream.h" -#include "common/textconsole.h" - -namespace M4 { - -MidiPlayer::MidiPlayer(MadsM4Engine *vm) : _vm(vm), _isGM(false) { - - MidiPlayer::createDriver(); - - int ret = _driver->open(); - if (ret == 0) { - _driver->setTimerCallback(this, &timerCallback); - } -} - -void MidiPlayer::send(uint32 b) { - if ((b & 0xF0) == 0xC0 && !_isGM && !_nativeMT32) { - b = (b & 0xFFFF00FF) | MidiDriver::_mt32ToGm[(b >> 8) & 0xFF] << 8; - } - - Audio::MidiPlayer::send(b); -} - -void MidiPlayer::playMusic(const char *name, int32 vol, bool loop, int32 trigger, int32 scene) { - Common::StackLock lock(_mutex); - - stop(); - - char fullname[144]; - _vm->res()->changeExtension(fullname, name, "HMP"); - - Common::SeekableReadStream *midiFile = _vm->res()->get(fullname); - byte *hmpData = new byte[midiFile->size()]; - uint32 smfSize; - - midiFile->read(hmpData, midiFile->size()); - _midiData = convertHMPtoSMF(hmpData, midiFile->size(), smfSize); - delete[] hmpData; - _vm->res()->toss(fullname); - _vm->res()->purge(); - - if (_midiData) { - _parser = MidiParser::createParser_SMF(); - _parser->setMidiDriver(this); - _parser->setTimerRate(_driver->getBaseTempo()); - - _parser->loadMusic(_midiData, smfSize); - _parser->property(MidiParser::mpAutoLoop, loop); - } - - setVolume(255); - - _isPlaying = true; -} - -// This function will convert HMP music into type 1 SMF, which our SMF parser -// will be able to handle. It is based on Hans de Goede's HMP 2 MIDI file -// converter, which in turn is "based on the conversion algorithms found in -// d1x, d2x-xl and jjffe". Hans's original code is licensed under the LGPL. -// -// TODO: It would probably be nicer to write a MIDI parser class to deal with -// HMP data directly. Though the multi-track nature of HMP makes that tricky. - -byte *MidiPlayer::convertHMPtoSMF(byte *data, uint32 inSize, uint32 &outSize) { - Common::MemoryReadStream readS(data, inSize); - Common::MemoryWriteStreamDynamic writeS; - - byte buf[8]; - - readS.read(buf, sizeof(buf)); - if (memcmp(buf, "HMIMIDIP", 8) != 0) { - warning("convertHMPtoSMF: Invalid HMP header"); - return NULL; - } - - // Read the number of tracks. Note that all the tracks are still part - // of the same song, just like in type 1 SMF files. - - readS.seek(0x30); - - uint32 numTracks = readS.readUint32LE(); - - // The first track starts on offset 0x300. It's currently unknown what - // the skipped data is for. - - readS.seek(0x300); - - // For some reason, we skip the first track entirely. - - byte a = readS.readByte(); - byte b = readS.readByte(); - byte c = readS.readByte(); - - while (a != 0xFF || b != 0x2F || c != 0x00) { - a = b; - b = c; - c = readS.readByte(); - } - - // The beginning of the MIDI header - static const byte midiHeader1[] = { 'M', 'T', 'h', 'd', 0, 0, 0, 6, 0, 1 }; - // The last 2 bytes of the midi header and track 0 - static const byte midiHeader2[] = { 0, 0xC0, 'M', 'T', 'r', 'k', 0, 0, 0, 0x0B, 0, 0xFF, 0x51, 0x03, 0x18, 0x80, 0, 0, 0xFF, 0x2F, 0 }; - - - // Write the MIDI header - writeS.write(midiHeader1, sizeof(midiHeader1)); - - // Write the number of tracks - writeS.writeUint16BE(numTracks); - - // Write the rest of the MIDI header and track 0. - writeS.write(midiHeader2, sizeof(midiHeader2)); - - // Read and convert all the tracks - for (uint i = 1; i < numTracks; i++) { - if (readS.readUint32LE() != i) { - warning("convertHMPtoSMF: Invalid HMP track number"); - delete[] writeS.getData(); - return NULL; - } - - uint32 trackLength = readS.readUint32LE() - 12; - readS.readUint32LE(); // Unused? - - // Write the track header - writeS.write("MTrk", 4); - - // This is where we will write the length of the track. - uint32 trackLengthPos = writeS.pos(); - writeS.writeUint32LE(0); - - // In the original, this is cleared once at the beginning of - // the function, but surely the last command does not carry - // over to the next track? - - byte lastCmd = 0; - - // Now we can finally convert the track - int32 endPos = readS.pos() + trackLength; - while (readS.pos() < endPos) { - // Convert the VLQ - byte vlq[4]; - int j = -1; - - do { - j++; - vlq[j] = readS.readByte(); - } while (!(vlq[j] & 0x80)); - - for (int k = 0; k <= j; k++) { - a = vlq[j - k] & 0x7F; - if (k != j) - a |= 0x80; - writeS.writeByte(a); - } - - a = readS.readByte(); - - if (a == 0xFF) { - // META event - b = readS.readByte(); - c = readS.readByte(); - - writeS.writeByte(a); - writeS.writeByte(b); - writeS.writeByte(c); - - if (c > 0) { - byte *metaBuf = new byte[c]; - readS.read(metaBuf, c); - writeS.write(metaBuf, c); - delete[] metaBuf; - } - - if (b == 0x2F) { - if (c != 0x00) { - warning("convertHMPtoSMF: End of track with non-zero size"); - delete[] writeS.getData(); - return NULL; - } - break; - } - } else { - if (a != lastCmd) - writeS.writeByte(a); - - switch (a & 0xF0) { - case 0x80: - case 0x90: - case 0xA0: - case 0xB0: - case 0xE0: - b = readS.readByte(); - c = readS.readByte(); - writeS.writeByte(b); - writeS.writeByte(c); - break; - case 0xC0: - case 0xD0: - b = readS.readByte(); - writeS.writeByte(b); - break; - default: - warning("convertHMPtoSMF: Invalid HMP command %02X", a); - delete[] writeS.getData(); - return NULL; - } - - lastCmd = a; - } - } - - if (readS.pos() != endPos) { - warning("convertHMPtoSMF: Invalid track length"); - delete[] writeS.getData(); - return NULL; - } - - WRITE_BE_UINT32(writeS.getData() + trackLengthPos, writeS.pos() - trackLengthPos - 4); - } - - outSize = writeS.size(); - return writeS.getData(); -} - -} // End of namespace M4 |