Allowing user to set one note to the host instead of having to load a MIDI file

src/AHHost.cpp

@@ -77,6 +77,11 @@ void AHHost::LoadMidiFile(const std::string midiFile)
 	midiPlayer_.LoadMidiFile(midiFile);	
 }
 
+void AHHost::CreateOneNote(int noteNumber, float duration, int velocity)
+{
+    midiPlayer_.CreateOneNote(noteNumber, duration, velocity); 
+}
+
 // Most was copy-pasted from PlaySequence example
 void AHHost::Play()
 {	
@@ -335,15 +340,11 @@ vector< list< vector<float> > > AHHost::RenderToBuffer()//CAStreamBasicDescripti
 		{
 			vector<float> data_temp(bufferSize_);
 			AudioBuffer ab = abl->mBuffers[i];
-
 			// TODO : if my understanding is correct, since we assume that we are using the genericOutput, we also assume that 32-bit little-endian float, deinterleaved
 			//        are coming from AudioUnitRender
 			memcpy(&(data_temp[0]), ab.mData, ab.mDataByteSize);
 			data[i].push_back(data_temp);
 
-			//for(int j=0; j<10; j++)
-			//	printf("%.5f ", data_temp[j]);
-			//printf("\n");
 		}
 
         midiPlayer_.GetTime( &currentTime );        

src/AHHost.h

@@ -53,6 +53,8 @@ class AHHost
 
 
     void LoadMidiFile(const string midiFile);
+    void CreateOneNote(int noteNumnber, float duration, int velocity);
+
 //	void LoadInstrument( const string& instrument, UInt32 busIndex = 0 );
 
 	vector< list< vector<float> > > Bounce();

src/AHMidiPlayer.cpp

@@ -54,6 +54,64 @@ void AHMidiPlayer::Stop()
     PrintIfErr( MusicPlayerStop( musicPlayer_ ) );
 }
 
+void AHMidiPlayer::CreateOneNote(int noteNumber, float duration, int velocity)
+{
+    // new music stuff
+    MusicPlayer temp_musicPlayer;
+    MusicSequence temp_musicSequence;
+    PrintIfErr( NewMusicPlayer(&temp_musicPlayer));
+    PrintIfErr( NewMusicSequence(&temp_musicSequence) );
+    PrintIfErr( MusicPlayerSetSequence(temp_musicPlayer, temp_musicSequence) );
+
+
+    // Disposing old music stuff
+    MusicTrack track;
+    UInt32 ntracks = GetTrackCount();
+    for( UInt32 trackIndex = 0; trackIndex < ntracks; ++trackIndex )
+    {
+        PrintIfErr( MusicSequenceGetIndTrack( musicSequence_, 0, &track ) );// 0 because we always delete the first one
+        PrintIfErr( MusicSequenceDisposeTrack(musicSequence_, track) );
+    }
+    PrintIfErr( DisposeMusicPlayer(musicPlayer_) );
+    PrintIfErr( DisposeMusicSequence(musicSequence_) );
+
+    // Create a MusicSequence with one track, one note called temp_musicSequence
+    PrintIfErr(MusicSequenceNewTrack(temp_musicSequence, &track));
+    MusicTimeStamp beat = 1.0;
+    MIDINoteMessage mess;
+    mess.channel = 0;
+    mess.note = noteNumber;
+    mess.velocity = velocity;
+    mess.releaseVelocity = 0;
+    mess.duration = duration;
+    PrintIfErr(MusicTrackNewMIDINoteEvent(track, beat, &mess));
+
+    musicPlayer_ = temp_musicPlayer;
+    musicSequence_ = temp_musicSequence;
+
+    PrintIfErr( MusicSequenceSetAUGraph(musicSequence_, graph_->GetAUGraph()) );
+
+
+    // // figure out sequence length, and add 8 beats to the end of the file to take decay etc. into account
+    MusicTimeStamp trackLength;
+    UInt32 propsize = sizeof( MusicTimeStamp );
+
+    ntracks = GetTrackCount();
+    //CAShow(musicSequence_);
+    musicSequenceLength_ = 0;
+    for( UInt32 trackIndex = 0; trackIndex < ntracks; ++trackIndex )
+    {        
+        PrintIfErr( MusicSequenceGetIndTrack( musicSequence_, trackIndex, &track ) );
+        PrintIfErr( MusicTrackGetProperty( track, kSequenceTrackProperty_TrackLength, &trackLength, &propsize ) );
+
+        if ( trackLength > musicSequenceLength_ ) musicSequenceLength_ = trackLength;
+    }
+    musicSequenceLength_ += 8;
+
+    SetupMidiChannelMapping();
+
+}
+
 void AHMidiPlayer::LoadMidiFile( const string& midiFilePath )
 {
     // new music stuff

src/AHMidiPlayer.h

@@ -33,6 +33,8 @@ class AHMidiPlayer
     ~AHMidiPlayer();
 
     void LoadMidiFile( const std::string& midiFile );
+    void CreateOneNote(int noteNumber, float duration, int velocity);
+
     void GetTime( MusicTimeStamp* currentTime );
     MusicTimeStamp GetSequenceLength() { return musicSequenceLength_; }
     MusicSequence GetMusicSequence() { return musicSequence_; }