mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-17 15:18:11 +00:00
363 lines
8.7 KiB
C++
363 lines
8.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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// FIXME: This is cribbed together from the SAGA music player. It needs cleanup
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// and testing.
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#include "m4/m4.h"
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#include "m4/midi.h"
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#include "common/stream.h"
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namespace M4 {
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MidiPlayer::MidiPlayer(M4Engine *vm, MidiDriver *driver) : _vm(vm), _midiData(NULL), _driver(driver), _isPlaying(false), _passThrough(false), _isGM(false) {
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memset(_channel, 0, sizeof(_channel));
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_masterVolume = 0;
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_parser = MidiParser::createParser_SMF();
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_parser->setMidiDriver(this);
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_parser->setTimerRate(getBaseTempo());
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open();
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}
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MidiPlayer::~MidiPlayer() {
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_driver->setTimerCallback(NULL, NULL);
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_parser->setMidiDriver(NULL);
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stopMusic();
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close();
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delete _parser;
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free(_midiData);
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}
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void MidiPlayer::setVolume(int volume) {
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Common::StackLock lock(_mutex);
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if (volume < 0)
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volume = 0;
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else if (volume > 255)
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volume = 255;
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if (_masterVolume == volume)
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return;
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_masterVolume = volume;
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for (int i = 0; i < 16; ++i) {
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if (_channel[i]) {
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_channel[i]->volume(_channelVolume[i] * _masterVolume / 255);
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}
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}
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}
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int MidiPlayer::open() {
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// Don't ever call open without first setting the output driver!
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if (!_driver)
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return 255;
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int ret = _driver->open();
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if (ret)
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return ret;
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_driver->setTimerCallback(this, &onTimer);
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return 0;
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}
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void MidiPlayer::close() {
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stopMusic();
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if (_driver)
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_driver->close();
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_driver = 0;
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}
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void MidiPlayer::send(uint32 b) {
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if (_passThrough) {
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_driver->send(b);
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return;
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}
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byte channel = (byte)(b & 0x0F);
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if ((b & 0xFFF0) == 0x07B0) {
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// Adjust volume changes by master volume
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byte volume = (byte)((b >> 16) & 0x7F);
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_channelVolume[channel] = volume;
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volume = volume * _masterVolume / 255;
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b = (b & 0xFF00FFFF) | (volume << 16);
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} else if ((b & 0xF0) == 0xC0 && !_isGM && !_nativeMT32) {
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b = (b & 0xFFFF00FF) | MidiDriver::_mt32ToGm[(b >> 8) & 0xFF] << 8;
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}
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else if ((b & 0xFFF0) == 0x007BB0) {
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//Only respond to All Notes Off if this channel
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//has currently been allocated
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if (_channel[b & 0x0F])
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return;
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}
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if (!_channel[channel])
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_channel[channel] = (channel == 9) ? _driver->getPercussionChannel() : _driver->allocateChannel();
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if (_channel[channel])
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_channel[channel]->send(b);
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}
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void MidiPlayer::metaEvent(byte type, byte *data, uint16 length) {
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switch (type) {
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case 0x2F:
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// End of track. (Not called when auto-looping.)
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stopMusic();
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break;
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case 0x51:
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// Set tempo. Handled by the standard MIDI parser already.
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break;
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default:
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warning("Unhandled meta event: %02x", type);
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break;
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}
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}
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void MidiPlayer::onTimer(void *refCon) {
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MidiPlayer *midi = (MidiPlayer *)refCon;
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Common::StackLock lock(midi->_mutex);
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if (midi->_isPlaying)
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midi->_parser->onTimer();
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}
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void MidiPlayer::playMusic(const char *name, int32 vol, bool loop, int32 trigger, int32 scene) {
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stopMusic();
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char fullname[144];
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_vm->res()->changeExtension(fullname, name, "HMP");
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Common::SeekableReadStream *midiFile = _vm->res()->get(fullname);
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byte *hmpData = new byte[midiFile->size()];
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uint32 smfSize;
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midiFile->read(hmpData, midiFile->size());
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_midiData = convertHMPtoSMF(hmpData, midiFile->size(), smfSize);
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delete[] hmpData;
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_vm->res()->toss(fullname);
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_vm->res()->purge();
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if (_midiData) {
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/*
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FILE *out = fopen("music.mid", "wb");
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fwrite(_midiData, smfSize, 1, out);
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fclose(out);
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*/
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_parser->loadMusic(_midiData, smfSize);
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_parser->property(MidiParser::mpAutoLoop, loop);
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}
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setVolume(255);
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_isPlaying = true;
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}
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void MidiPlayer::stopMusic() {
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Common::StackLock lock(_mutex);
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_isPlaying = false;
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if (_parser) {
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_parser->unloadMusic();
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}
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if (_midiData) {
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free(_midiData);
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_midiData = NULL;
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}
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}
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// This function will convert HMP music into type 1 SMF, which our SMF parser
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// will be able to handle. It is based on Hans de Goede's HMP 2 MIDI file
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// converter, which in turn is "based on the conversion algorithms found in
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// d1x, d2x-xl and jjffe". Hans's original code is licensed under the LGPL.
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//
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// TODO: It would probably be nicer to write a MIDI parser class to deal with
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// HMP data directly. Though the multi-track nature of HMP makes that tricky.
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byte *MidiPlayer::convertHMPtoSMF(byte *data, uint32 inSize, uint32 &outSize) {
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Common::MemoryReadStream readS(data, inSize);
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Common::MemoryWriteStreamDynamic writeS;
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byte buf[8];
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readS.read(buf, sizeof(buf));
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if (memcmp(buf, "HMIMIDIP", 8) != 0) {
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warning("convertHMPtoSMF: Invalid HMP header");
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return NULL;
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}
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// Read the number of tracks. Note that all the tracks are still part
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// of the same song, just like in type 1 SMF files.
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readS.seek(0x30);
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uint32 numTracks = readS.readUint32LE();
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// The first track starts on offset 0x300. It's currently unknown what
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// the skipped data is for.
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readS.seek(0x300);
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// For some reason, we skip the first track entirely.
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byte a = readS.readByte();
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byte b = readS.readByte();
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byte c = readS.readByte();
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while (a != 0xFF || b != 0x2F || c != 0x00) {
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a = b;
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b = c;
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c = readS.readByte();
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}
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// The beginning of the MIDI header
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static const byte midiHeader1[] = { 'M', 'T', 'h', 'd', 0, 0, 0, 6, 0, 1 };
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// The last 2 bytes of the midi header and track 0
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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 };
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// Write the MIDI header
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writeS.write(midiHeader1, sizeof(midiHeader1));
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// Write the number of tracks
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writeS.writeUint16BE(numTracks);
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// Write the rest of the MIDI header and track 0.
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writeS.write(midiHeader2, sizeof(midiHeader2));
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// Read and convert all the tracks
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for (uint i = 1; i < numTracks; i++) {
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if (readS.readUint32LE() != i) {
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warning("convertHMPtoSMF: Invalid HMP track number");
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delete[] writeS.getData();
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return NULL;
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}
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uint32 trackLength = readS.readUint32LE() - 12;
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readS.readUint32LE(); // Unused?
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// Write the track header
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writeS.write("MTrk", 4);
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// This is where we will write the length of the track.
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uint32 trackLengthPos = writeS.pos();
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writeS.writeUint32LE(0);
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// In the original, this is cleared once at the beginning of
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// the function, but surely the last command does not carry
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// over to the next track?
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byte lastCmd = 0;
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// Now we can finally convert the track
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int32 endPos = readS.pos() + trackLength;
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while (readS.pos() < endPos) {
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// Convert the VLQ
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byte vlq[4];
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int j = -1;
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do {
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j++;
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vlq[j] = readS.readByte();
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} while (!(vlq[j] & 0x80));
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for (int k = 0; k <= j; k++) {
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a = vlq[j - k] & 0x7F;
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if (k != j)
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a |= 0x80;
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writeS.writeByte(a);
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}
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a = readS.readByte();
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if (a == 0xFF) {
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// META event
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b = readS.readByte();
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c = readS.readByte();
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writeS.writeByte(a);
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writeS.writeByte(b);
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writeS.writeByte(c);
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if (c > 0) {
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byte *metaBuf = new byte[c];
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readS.read(metaBuf, c);
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writeS.write(metaBuf, c);
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delete[] metaBuf;
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}
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if (b == 0x2F) {
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if (c != 0x00) {
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warning("convertHMPtoSMF: End of track with non-zero size");
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delete[] writeS.getData();
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return NULL;
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}
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break;
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}
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} else {
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if (a != lastCmd)
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writeS.writeByte(a);
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switch (a & 0xF0) {
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case 0x80:
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case 0x90:
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case 0xA0:
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case 0xB0:
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case 0xE0:
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b = readS.readByte();
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c = readS.readByte();
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writeS.writeByte(b);
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writeS.writeByte(c);
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break;
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case 0xC0:
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case 0xD0:
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b = readS.readByte();
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writeS.writeByte(b);
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break;
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default:
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warning("convertHMPtoSMF: Invalid HMP command %02X", a);
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delete[] writeS.getData();
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return NULL;
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}
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lastCmd = a;
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}
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}
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if (readS.pos() != endPos) {
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warning("convertHMPtoSMF: Invalid track length");
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delete[] writeS.getData();
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return NULL;
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}
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WRITE_BE_UINT32(writeS.getData() + trackLengthPos, writeS.pos() - trackLengthPos - 4);
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}
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outSize = writeS.size();
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return writeS.getData();
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}
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} // End of namespace M4
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