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| //
// Music.cpp
// test26
//
// Created by Lion User on 14/03/13.
// Copyright (c) 2013 Lion User. All rights reserved.
//
#ifdef _cplusplus
#include "Music.h"
#include <CoreServices/CoreServices.h> //for file stuff
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioToolbox.h> //for AUGraph
#include <unistd.h> // used for usleep...
// This call creates the Graph and the Synth unit...
OSStatus CreateAUGraph (AUGraph &outGraph, AudioUnit &outSynth)
{
OSStatus result;
//create the nodes of the graph
AUNode synthNode, limiterNode, outNode;
AudioComponentDescription cd;
cd.componentManufacturer = kAudioUnitManufacturer_Apple;
cd.componentFlags = 0;
cd.componentFlagsMask = 0;
require_noerr (result = NewAUGraph (&outGraph), home);
cd.componentType = kAudioUnitType_MusicDevice;
cd.componentSubType = kAudioUnitSubType_DLSSynth;
require_noerr (result = AUGraphAddNode (outGraph, &cd, &synthNode), home);
cd.componentType = kAudioUnitType_Effect;
cd.componentSubType = kAudioUnitSubType_PeakLimiter;
require_noerr (result = AUGraphAddNode (outGraph, &cd, &limiterNode), home);
cd.componentType = kAudioUnitType_Output;
cd.componentSubType = kAudioUnitSubType_DefaultOutput;
require_noerr (result = AUGraphAddNode (outGraph, &cd, &outNode), home);
require_noerr (result = AUGraphOpen (outGraph), home);
require_noerr (result = AUGraphConnectNodeInput (outGraph, synthNode, 0, limiterNode, 0), home);
require_noerr (result = AUGraphConnectNodeInput (outGraph, limiterNode, 0, outNode, 0), home);
// ok we're good to go - get the Synth Unit...
require_noerr (result = AUGraphNodeInfo(outGraph, synthNode, 0, &outSynth), home);
home:
return result;
}
// some MIDI constants:
enum {
kMidiMessage_ControlChange = 0xB,
kMidiMessage_ProgramChange = 0xC,
kMidiMessage_BankMSBControl = 0,
kMidiMessage_BankLSBControl = 32,
kMidiMessage_NoteOn = 0x9
};
int test() {
AUGraph graph = 0;
AudioUnit synthUnit;
OSStatus result;
char* bankPath = 0;
UInt8 midiChannelInUse = 0; //we're using midi channel 1...
// this is the only option to main that we have...
// just the full path of the sample bank...
// On OS X there are known places were sample banks can be stored
// Library/Audio/Sounds/Banks - so you could scan this directory and give the user options
// about which sample bank to use...
//if (argc > 1) bankPath = const_cast<char*>(argv[1]);
require_noerr (result = CreateAUGraph (graph, synthUnit), home);
// if the user supplies a sound bank, we'll set that before we initialize and start playing
if (bankPath)
{
FSRef fsRef;
require_noerr (result = FSPathMakeRef ((const UInt8*)bankPath, &fsRef, 0), home);
printf ("Setting Sound Bank:%s\n", bankPath);
require_noerr (result = AudioUnitSetProperty (synthUnit,
kMusicDeviceProperty_SoundBankFSRef,
kAudioUnitScope_Global, 0,
&fsRef, sizeof(fsRef)), home);
}
// ok we're set up to go - initialize and start the graph
require_noerr (result = AUGraphInitialize (graph), home);
//set our bank
require_noerr (result = MusicDeviceMIDIEvent(synthUnit,
kMidiMessage_ControlChange << 4 | midiChannelInUse,
kMidiMessage_BankMSBControl, 0,
0/*sample offset*/), home);
require_noerr (result = MusicDeviceMIDIEvent(synthUnit,
kMidiMessage_ProgramChange << 4 | midiChannelInUse,
0/*prog change num*/, 0,
0/*sample offset*/), home);
CAShow (graph); // prints out the graph so we can see what it looks like...
require_noerr (result = AUGraphStart (graph), home);
// we're going to play an octave of MIDI notes: one a second
for (int i = 0; i < 4; i++) {
//UInt32 noteNum = i + 60;
UInt32 onVelocity = 127;
UInt32 noteOnCommand = kMidiMessage_NoteOn << 4 | midiChannelInUse;
require_noerr (result = MusicDeviceMIDIEvent(synthUnit, noteOnCommand, 60, onVelocity, 0), home);
require_noerr (result = MusicDeviceMIDIEvent(synthUnit, noteOnCommand, 65, onVelocity, 0), home);
require_noerr (result = MusicDeviceMIDIEvent(synthUnit, noteOnCommand, 68, onVelocity, 0), home);
// sleep for a second
usleep (1 * 1000 * 1000);
require_noerr (result = MusicDeviceMIDIEvent(synthUnit, noteOnCommand, 60, 0, 0), home);
require_noerr (result = MusicDeviceMIDIEvent(synthUnit, noteOnCommand, 65, 0, 0), home);
require_noerr (result = MusicDeviceMIDIEvent(synthUnit, noteOnCommand, 68, 0, 0), home);
}
// ok we're done now
home:
if (graph) {
AUGraphStop (graph); // stop playback - AUGraphDispose will do that for us but just showing you what to do
DisposeAUGraph (graph);
}
return result;
}
#endif |
