/// <summary>
/// Event handler for individual miniGrid (holding 1-4 sounds) in mastergrid
/// </summary>
void OnMiniGridTapped(MiniGrid miniGrid)
{
Instrument selectedInstrument = selectedInstrButton.Instrument;
// Changes UI represenation and returns new set of colors on this grid
bool added = miniGrid.ToggleColor(selectedInstrument.color);
// If sidebar color isn't part of button's new set of colors, remove it
Instrument.Note toggledNote = selectedInstrument.AtPitch(miniGrid.semitoneShift);
//If sidebar button color = clicked button color
if (added)
{
song.AddNote(toggledNote, Grid.GetColumn(miniGrid)); // Add the note
if (!player.IsPlaying)
{
SingleNotePlayer.PlayNote(selectedInstrument.AtPitch(miniGrid.semitoneShift)); // Play note so long as not already playing a song
}
}
else
{
song.RemoveNote(toggledNote, Grid.GetColumn(miniGrid));
}
//Undo clear stops woking when user adds stuff to grid so they don't accidentally undo clear
clearedSong = null;
loadedSongChanged = true; // If song is empty, no need to worry about changes, otherwise
}
/// <summary>
/// Plays a single note. Separate from the rest of the song playing code
/// </summary>
public static void PlayNote(Instrument.Note note)
{
lock (syncObj)
{
#if __ANDROID__
if (playingTrack != null)
{
//We use pause instead of stop because pause stops playing immediately
playingTrack.Pause();
playingTrack.Release();
playingTrack.Dispose();
}
#endif
#if __IOS__
if (audioQueue != null)
{
//Pass true to stop immediately
audioQueue.Stop(true);
audioQueue.Dispose();
}
#endif
#if __ANDROID__
playingTrack = new AudioTrack(
// Stream type
Android.Media.Stream.Music,
// Frequency
SongPlayer.PLAYBACK_RATE,
// Mono or stereo
ChannelOut.Mono,
// Audio encoding
Android.Media.Encoding.Pcm16bit,
// Length of the audio clip in bytes
(note.data.Length * 2),
// Mode. Stream or static.
AudioTrackMode.Static);
playingTrack.Write(note.data, 0, note.data.Length);
playingTrack.Play();
#endif
#if __IOS__
audioQueue = new OutputAudioQueue(AudioStreamBasicDescription.CreateLinearPCM(SongPlayer.PLAYBACK_RATE, 1, 16, false));
unsafe
{
AudioQueueBuffer *buffer;
audioQueue.AllocateBuffer(note.data.Length * 2, out buffer);
fixed(short *beatData = note.data)
{
buffer->CopyToAudioData((IntPtr)beatData, note.data.Length * 2);
}
audioQueue.EnqueueBuffer((IntPtr)buffer, note.data.Length * 2, null);
}
audioQueue.Start();
#endif
}
}
/// <summary>
/// Remove a note from the song at a specific beat
/// </summary>
/// <param name="note">The note to remove from the song</param>
/// <param name="beat">The beat to remove the note from</param>
public void RemoveNote(Instrument.Note note, int beat)
{
//We use a lock so that the beat data is not modified while we are removing
lock (beats)
{
beats[beat].Remove(note);
}
}
/// <summary>
/// Add a note to the song at a specific beat
/// </summary>
/// <param name="note">The note to add to the song</param>
/// <param name="beat">The beat to add the note at</param>
public void AddNote(Instrument.Note note, int beat)
{
//We use a lock so that the beat data is not modified while we are adding
lock (beats)
{
beats[beat].Add(note);
}
}
/// <summary>
/// Generates a Song object from a stream containing a text representation of a song
/// </summary>
public static Song LoadSongFromStream(Stream stream)
{
//Use StreamReader because the songs are in text foma
StreamReader file = new StreamReader(stream);
String versionString = file.ReadLine();
if (versionString != "VERSION 1" && versionString != "VERSION 1.0.2")
{
throw new FileLoadException("Save file is in an invalid format");
}
//The first line of a song file contains the number of beats
//and the song's instruments. It usually looks something like
//16 beats|Snare|BassDrum|Piano|Clap
//Get total beats
String[] firstLineParts = file.ReadLine().Split('|');
int totalBeats = int.Parse(firstLineParts[0].Split(' ')[0]);
//Load instruments
Instrument[] songInstruments = new Instrument[firstLineParts.Length - 1];
for (int i = 1; i < firstLineParts.Length; i++)
{
songInstruments[i - 1] = Instrument.GetByName(firstLineParts[i]);
}
//Tempo is stored at the end of the file, so for now set the tempo to be -1
Song loadedSong = new Song(totalBeats, songInstruments, -1);
//Load notes
for (int i = 0; i < totalBeats; i++)
{
//Each beat starts with a header of the form
//Beat <beat number>|<number of notes>
String header = file.ReadLine();
int numNotes = int.Parse(header.Split('|')[1]);
for (int n = 0; n < numNotes; n++)
{
//Each note is stored like so:
//<instrument name>:<semitone shift>
String[] noteStringParts = file.ReadLine().Split(':');
String instrName = noteStringParts[0];
int semitoneShift = int.Parse(noteStringParts[1]);
Instrument.Note note = Instrument.GetByName(instrName).AtPitch(semitoneShift);
loadedSong.AddNote(note, i);
}
}
//The last line of the file is the tempo
loadedSong.Tempo = int.Parse(file.ReadLine());
return(loadedSong);
}
/// <summary>
/// Returns an array containing the notes at the given beat
/// </summary>
/// <param name="beat">The beat to get the notes from</param>
/// <returns>The notes at <code>beat</code></returns>
public Instrument.Note[] NotesAtBeat(int beat)
{
Instrument.Note[] notes;
//Lock so that the notes do not change while they are being copied
lock (beats)
{
notes = new Instrument.Note[beats[beat].Count];
beats[beat].CopyTo(notes);
}
return(notes);
}
/// <summary>
/// Replaces the instruments listed in oldInstruments with the respective instrument in newInstruments
/// </summary>
public void ReplaceInstruments(IList <Instrument> oldInstruments, IList <Instrument> newInstruments)
{
//Lock so that the beats do not change while they are being modified
lock (beats)
{
foreach (HashSet <Instrument.Note> beat in beats)
{
List <Instrument.Note> oldNotes = beat.ToList();
beat.Clear();
foreach (Instrument.Note oldNote in oldNotes)
{
//If this note's instrument is in oldInstrument, replace it with a note
//of the same pitch but from the new instrument
int index = oldInstruments.IndexOf(oldNote.instrument);
if (index < 0)
{
//Not supposed to be replaced, so just readd it.
beat.Add(oldNote);
}
else
{
//Replace with new note
Instrument.Note newNote = newInstruments[index].AtPitch(oldNote.semitoneShift);
beat.Add(newNote);
}
}
}
//Update Instruments
for (int i = 0; i < oldInstruments.Count; i++)
{
Instrument oldInstr = oldInstruments[i];
Instruments[Array.IndexOf(Instruments, oldInstr)] = newInstruments[i];
}
}
}
public PlayingNote(Instrument.Note note, int startSample)
{
this.note = note;
this.startSample = startSample;
}
