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123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001/2002 The ScummVM project
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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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*
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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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*
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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#ifdef MACOSX
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#include "sound/mpu401.h"
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#include <AudioUnit/AudioUnit.h>
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// FIXME - the following disables reverb support in the QuickTime / CoreAudio
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// midi backends. For some reasons, reverb will suck away a *lot* of CPU time.
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// Until we know for sure what is causing this and if there is a better way to
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// fix the problem, we just disable all reverb for these backends.
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#define COREAUDIO_REVERB_HACK
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/* CoreAudio MIDI driver
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* Based on code by Benjamin W. Zale
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* Extended by Max Horn
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*/
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class MidiDriver_CORE : public MidiDriver_MPU401 {
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public:
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MidiDriver_CORE() : au_MusicDevice(0), au_output(0) { }
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int open();
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void close();
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void send(uint32 b);
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private:
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AudioUnit au_MusicDevice;
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AudioUnit au_output;
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};
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int MidiDriver_CORE::open()
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{
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if (au_output != NULL)
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return MERR_ALREADY_OPEN;
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int err;
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AudioUnitConnection auconnect;
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ComponentDescription compdesc;
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Component compid;
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// Open the Music Device
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compdesc.componentType = kAudioUnitComponentType;
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compdesc.componentSubType = kAudioUnitSubType_MusicDevice;
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compdesc.componentManufacturer = kAudioUnitID_DLSSynth;
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compdesc.componentFlags = 0;
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compdesc.componentFlagsMask = 0;
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compid = FindNextComponent(NULL, &compdesc);
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au_MusicDevice = (AudioUnit) OpenComponent(compid);
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// open the output unit
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au_output = (AudioUnit) OpenDefaultComponent(kAudioUnitComponentType, kAudioUnitSubType_Output);
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// connect the units
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auconnect.sourceAudioUnit = au_MusicDevice;
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auconnect.sourceOutputNumber = 0;
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auconnect.destInputNumber = 0;
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err =
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AudioUnitSetProperty(au_output, kAudioUnitProperty_MakeConnection, kAudioUnitScope_Input, 0,
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(void *)&auconnect, sizeof(AudioUnitConnection));
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// initialize the units
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AudioUnitInitialize(au_MusicDevice);
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AudioUnitInitialize(au_output);
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// start the output
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AudioOutputUnitStart(au_output);
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return 0;
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}
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void MidiDriver_CORE::close()
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{
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// Stop the output
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AudioOutputUnitStop(au_output);
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// Cleanup
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CloseComponent(au_output);
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CloseComponent(au_MusicDevice);
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}
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void MidiDriver_CORE::send(uint32 b)
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{
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unsigned char first_byte, seccond_byte, status_byte;
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status_byte = (b & 0x000000FF);
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first_byte = (b & 0x0000FF00) >> 8;
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seccond_byte = (b & 0x00FF0000) >> 16;
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#ifdef COREAUDIO_REVERB_HACK
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if ((status_byte&0xF0) == 0xB0 && first_byte == 0x5b)
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return;
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#endif
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MusicDeviceMIDIEvent(au_MusicDevice, status_byte, first_byte, seccond_byte, 0);
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}
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MidiDriver *MidiDriver_CORE_create()
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{
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return new MidiDriver_CORE();
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}
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#endif // MACOSX
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