static bool displayNotesPlayed = false; //Stores whether the notes that the user played should be displayed or not
#region Form Triggered Methods
public frmTest(midiFile _inputMidi, databaseInterface _databaseInterface)
{
InitializeComponent();
currentMidiFile = _inputMidi; //new midiFile(_inputMidi.devision, _inputMidi.tempo, _inputMidi.timeSig, _inputMidi.keySig, _inputMidi.listOfNotes, _inputMidi.Instrument, _databaseInterface, out bool error, out string errorString);
databaseInterface = _databaseInterface;
currentMidiFile.GenerateMusicPage(picDisplay.Width, picDisplay.Height, 0, ckbFingering.Checked, false, out Bitmap pageToDisplay, out nextFirstStaff, out string errorString);
picDisplay.Image = pageToDisplay;
}
public frmViewMusic(midiFile inputFile)
{
string errorString;
loadedMidiFile = inputFile;
InitializeComponent();
//Load bitmaps
loadedMidiFile.GenerateMusicPage(picDisplay.Width, picDisplay.Height, 0, false, false, out Bitmap pageToDisplay, out int nextLine, out errorString);
picDisplay.Image = pageToDisplay;
}
/// <summary>
/// Parses the MIDI file into the midiFile class
/// </summary>
/// <param name="midiStream">The Stream that should be parsed</param>
/// <param name="outputMidiFile">The MIDI File class that will be outputted filled with data</param>
/// <param name="errorString">In case the file could not be parsed, then this will contain the error</param>
/// <returns>Returns whether the parse was sucsessful</returns>
private bool ParseMidiFile(Stream midiStream, string instrument, out midiFile outputMidiFile, out string errorString)
{
#region Variables
byte currentbyte; //Stores the current byte being processed
byte statusCarry; //Stores the last status byte for use by status carry
bool end = false; //Has the end of the file been reached?
uint chunkType;
uint currentChunkLength; //Stores the length of the current chunk
outputMidiFile = null; //Stores the parsed midiFile
errorString = null; //Stores any error messages that are generated
List <Note> listOfNotes; //List to store the parsed notes
ushort format; //Stores the Midi file's format. (The program can only deal with format 0 MIDI files)
ushort numOfTracks; //Store the number of track chuhnks to be found in the file. Should be 1 for Format 0 files
ushort division; //Store the pace of the MIDI file
#endregion
#region Parse Head Chunk
#region Get data from stream
//Chunk Type (4 bytes) - Will be either "MThd" for the head chunk or "MTrk" for track chunk in ASCII.
chunkType = (uint)((midiStream.ReadByte() << 24) | (midiStream.ReadByte() << 16) | (midiStream.ReadByte() << 8) | (midiStream.ReadByte())); //Gets the chunk type
//Length (4 bytes) - In Head chunk, should always be 6
currentChunkLength = (uint)((midiStream.ReadByte() << 24) | (midiStream.ReadByte() << 16) | (midiStream.ReadByte() << 8) | (midiStream.ReadByte())); //Convert the 4 bytes into 1 integer. First byte times by 16^6 plus the second byte times 16^4 and so on
//Format (2 byte) - Should be either 0, 1 or 2. This program can only deal with format 0 MIDI Files
format = (ushort)((midiStream.ReadByte() << 8) | (midiStream.ReadByte()));
//Number of Tracks (2 bytes) - Should be 1 for format 0 MIDI files
numOfTracks = (ushort)((midiStream.ReadByte() << 8) | (midiStream.ReadByte()));
//Division (2 bytes) - Stores the speed and the tempo of the MIDI File. Can either store the Number of delta time units in a crochet, or the number of frames per second and the number of ticks per frame. Outlined below.
division = (ushort)((midiStream.ReadByte() << 8) | (midiStream.ReadByte()));
/* Bit: | 15 | 14 - 8 | 7 - 0 |
* | 0 | Ticks per crochet |
* | 1 |-frames/second|ticks/frame|
*/
#endregion
#region Validate data
//Make sure all aspects of the head chunks are valid, if they are not, then output an error and return that the parse failed
if (chunkType != 0x4d546864)
{
errorString = "Head Chunk title not found";
return(false);
}
else if (currentChunkLength != 6)
{
errorString = "Head Chunk invalid length";
return(false);
}
else if (format != 0)
{
errorString = "Format not valid";
return(false);
}
else if (numOfTracks != 1)
{
errorString = "Invalid number of Track Chunks";
return(false);
}
else if (division > 0x8000)
{
errorString = "Invalid division format";
return(false);
}
#endregion
#endregion
#region Parse Track Chunk
//Chunk Type (4 bytes) - Will be either "MThd" for the head chunk or "MTrk" for track chunk in ASCII.
chunkType = (uint)((midiStream.ReadByte() << 24) | (midiStream.ReadByte() << 16) | (midiStream.ReadByte() << 8) | (midiStream.ReadByte())); //Gets the chunk type
//Length (4 bytes)
currentChunkLength = (uint)((midiStream.ReadByte() << 24) | (midiStream.ReadByte() << 16) | (midiStream.ReadByte() << 8) | (midiStream.ReadByte())); //Convert the 4 bytes into 1 integer. First byte times by 16^6 plus the second byte times 16^4 and so on
//If the chunk type is not the track chunk, then display the error and exit the function
if (chunkType != 0x4d54726b)
{
errorString = "Could not find Track Chunk";
return(false);
}
//Read MIDI Track Data. If the track data could not be read properly, end the function
if (!ReadTrackData(midiStream, currentChunkLength, out listOfNotes, out errorString))
{
return(false);
}
#endregion
//Create the new midiFile and assign it the values that have been read from the stream
outputMidiFile = new midiFile(division, null, null, null, listOfNotes, instrument, new databaseInterface(dbConnectionString), out bool error, out errorString);
//Un-grey out the buttons to allow the people to choose other forms
btnLookAtMusic.Enabled = true;
btnTest.Enabled = true;
return(true);
}
