public static short ReadInt16LE(this IReadable input)
{
var ch1 = input.ReadByte();
var ch2 = input.ReadByte();
return(Platform.ToInt16((ch2 << 8) | ch1));
}
public static ushort ReadUInt16BE(this IReadable input)
{
var ch1 = input.ReadByte();
var ch2 = input.ReadByte();
return(Platform.Platform.ToUInt16((ch1 << 8) | (ch2 << 0)));
}
private static MidiEvent ReadVoiceMessage(IReadable input, int delta, byte status, byte data1)
{
switch ((MidiEventTypeEnum)(status & 0xF0))
{
case MidiEventTypeEnum.NoteOff:
return(new MidiEvent(delta, status, data1, (byte)input.ReadByte()));
case MidiEventTypeEnum.NoteOn:
var velocity = input.ReadByte();
if (velocity == 0)
{
status = (byte)((status & 0x0F) | 0x80);
}
return(new MidiEvent(delta, status, data1, (byte)velocity));
case MidiEventTypeEnum.NoteAftertouch:
return(new MidiEvent(delta, status, data1, (byte)input.ReadByte()));
case MidiEventTypeEnum.Controller:
return(new MidiEvent(delta, status, data1, (byte)input.ReadByte()));
case MidiEventTypeEnum.ProgramChange:
return(new MidiEvent(delta, status, data1, 0));
case MidiEventTypeEnum.ChannelAftertouch:
return(new MidiEvent(delta, status, data1, 0));
case MidiEventTypeEnum.PitchBend:
return(new MidiEvent(delta, status, data1, (byte)input.ReadByte()));
default:
throw new Exception("The status provided was not that of a voice message.");
}
}
public static short ReadInt16BE(this IReadable input)
{
var ch1 = input.ReadByte();
var ch2 = input.ReadByte();
return(TypeUtils.ToInt16((ch1 << 8) | (ch2 << 0)));
}
public SoundFontSampleData(IReadable input)
{
var id = input.Read8BitChars(4);
var size = input.ReadInt32LE();
if (id.ToLower() != "list")
throw new Exception("Invalid soundfont. Could not find sdta LIST chunk.");
var readTo = input.Position + size;
id = input.Read8BitChars(4);
if (id.ToLower() != "sdta")
throw new Exception("Invalid soundfont. The LIST chunk is not of type sdta.");
BitsPerSample = 0;
byte[] rawSampleData = null;
while (input.Position < readTo)
{
var subID = input.Read8BitChars(4);
size = input.ReadInt32LE();
switch (subID.ToLower())
{
case "smpl":
BitsPerSample = 16;
rawSampleData = input.ReadByteArray(size);
break;
case "sm24":
if (rawSampleData == null || size != Math.Ceiling(SampleData.Length / 2.0))
{//ignore this chunk if wrong size or if it comes first
input.Skip(size);
}
else
{
BitsPerSample = 24;
for (var x = 0; x < SampleData.Length; x++)
{
var b = new byte[3];
b[0] = (byte)input.ReadByte();
b[1] = rawSampleData[2 * x];
b[2] = rawSampleData[2 * x + 1];
}
}
if (size % 2 == 1)
{
if (input.ReadByte() != 0)
{
input.Position--;
}
}
break;
default:
throw new Exception("Invalid soundfont. Unknown chunk id: " + subID + ".");
}
}
if (BitsPerSample == 16)
{
SampleData = rawSampleData;
}
else if (BitsPerSample != 24)
throw new Exception("Only 16 and 24 bit samples are supported.");
}
public static uint ReadUInt32(this IReadable input)
{
var ch1 = input.ReadByte();
var ch2 = input.ReadByte();
var ch3 = input.ReadByte();
var ch4 = input.ReadByte();
return(TypeUtils.ToUInt32((ch1 << 24) | (ch2 << 16) | (ch3 << 8) | (ch4 << 0)));
}
public static int ReadInt32LE(this IReadable input)
{
var ch1 = input.ReadByte();
var ch2 = input.ReadByte();
var ch3 = input.ReadByte();
var ch4 = input.ReadByte();
return((ch4 << 24) | (ch3 << 16) | (ch2 << 8) | (ch1 << 0));
}
public static uint ReadUInt32LE(this IReadable input)
{
var ch1 = input.ReadByte();
var ch2 = input.ReadByte();
var ch3 = input.ReadByte();
var ch4 = input.ReadByte();
return(Platform.ToUInt32((ch4 << 24) | (ch3 << 16) | (ch2 << 8) | ch1));
}
public static float GpReadFloat(this IReadable data)
{
var bytes = new byte[4];
bytes[3] = (byte)data.ReadByte();
bytes[2] = (byte)data.ReadByte();
bytes[2] = (byte)data.ReadByte();
bytes[1] = (byte)data.ReadByte();
return(Platform.Platform.ToFloat(bytes));
}
public static string Read8BitString(this IReadable input)
{
var s = new StringBuilder();
var c = input.ReadByte();
while (c != 0)
{
s.AppendChar(c);
c = input.ReadByte();
}
return(s.ToString());
}
public SampleHeader(IReadable input)
{
Name = input.Read8BitStringLength(20);
Start = input.ReadInt32LE();
End = input.ReadInt32LE();
StartLoop = input.ReadInt32LE();
EndLoop = input.ReadInt32LE();
SampleRate = input.ReadInt32LE();
RootKey = (byte)input.ReadByte();
Tune = Platform.Platform.ToInt16(input.ReadByte());
SampleLink = input.ReadUInt16LE();
SoundFontSampleLink = (SFSampleLink)input.ReadUInt16LE();
}
public SampleHeader(IReadable input)
{
Name = input.Read8BitStringLength(20);
Start = input.ReadInt32LE();
End = input.ReadInt32LE();
StartLoop = input.ReadInt32LE();
EndLoop = input.ReadInt32LE();
SampleRate = input.ReadInt32LE();
RootKey = (byte) input.ReadByte();
Tune = TypeUtils.ToInt16(input.ReadByte());
SampleLink = input.ReadUInt16LE();
SoundFontSampleLink = (SFSampleLink) input.ReadUInt16LE();
}
public static string Read8BitStringLength(this IReadable input, int length)
{
var s = new StringBuilder();
var z = -1;
for (var i = 0; i < length; i++)
{
var c = input.ReadByte();
if (c == 0 && z == -1)
{
z = i;
}
s.AppendChar(c);
}
var t = s.ToString();
if (z >= 0)
{
return(t.Substring(0, z));
}
return(t);
}
/// <summary>
/// Reads an integer as size, skips a byte and reads the string itself
/// </summary>
/// <returns></returns>
public static string GpReadStringIntByte(this IReadable data)
{
var length = data.ReadInt32LE() - 1;
data.ReadByte();
return(data.GpReadString(length));
}
private bool FindHead(IReadable input, int attempts)
{
var match = 0;
while (attempts > 0)
{
switch (input.ReadByte())
{
case (int)'M':
match = 1;
break;
case (int)'T':
match = match == 1 ? 2 : 0;
break;
case (int)'h':
match = match == 2 ? 3 : 0;
break;
case (int)'d':
if (match == 3)
{
return(true);
}
match = 0;
break;
}
attempts--;
}
return(false);
}
public static Color GpReadColor(this IReadable data, bool readAlpha = false)
{
byte r = (byte)data.ReadByte();
byte g = (byte)data.ReadByte();
byte b = (byte)data.ReadByte();
byte a = 255;
if (readAlpha)
{
a = (byte)data.ReadByte();
}
else
{
data.Skip(1);
}
return(new Color(r, g, b, a));
}
public static string Read8BitChars(this IReadable input, int length)
{
var s = new StringBuilder();
for (int i = 0; i < length; i++)
{
s.AppendChar(input.ReadByte());
}
return(s.ToString());
}
public static sbyte ReadSignedByte(this IReadable readable)
{
var n = readable.ReadByte();
if (n >= 128)
{
return((sbyte)(n - 256));
}
return((sbyte)n);
}
private static MidiEvent ReadSystemCommonMessage(IReadable input, int delta, byte status)
{
switch ((SystemCommonTypeEnum)status)
{
case SystemCommonTypeEnum.SystemExclusive2:
case SystemCommonTypeEnum.SystemExclusive:
{
var maker = input.ReadInt16BE();
if (maker == 0x0)
{
maker = input.ReadInt16BE();
}
else if (maker == 0xF7)
{
return(null);
}
var data = new FastList <byte>();
var b = input.ReadByte();
while (b != 0xF7)
{
data.Add((byte)b);
b = input.ReadByte();
}
return(new SystemExclusiveEvent(delta, status, maker, data.ToArray()));
}
case SystemCommonTypeEnum.MtcQuarterFrame:
return(new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0));
case SystemCommonTypeEnum.SongPosition:
return(new SystemCommonEvent(delta, status, (byte)input.ReadByte(), (byte)input.ReadByte()));
case SystemCommonTypeEnum.SongSelect:
return(new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0));
case SystemCommonTypeEnum.TuneRequest:
return(new SystemCommonEvent(delta, status, 0, 0));
default:
throw new Exception("The system common message was invalid or unsupported : " + status);
}
}
/// <summary>
/// Reads a byte as size and the string itself.
/// Additionally it is ensured the specified amount of bytes is read.
/// </summary>
/// <param name="data">the data to read from.</param>
/// <param name="length">the amount of bytes to read</param>
/// <returns></returns>
public static string GpReadStringByteLength(this IReadable data, int length)
{
var stringLength = data.ReadByte();
var s = data.GpReadString(stringLength);
if (stringLength < length)
{
data.Skip(length - stringLength);
}
return(s);
}
private static int ReadVariableLength(IReadable input)
{
var value = 0;
int next;
do
{
next = input.ReadByte();
value = value << 7;
value = value | (next & 0x7F);
} while ((next & 0x80) == 0x80);
return(value);
}
public static HydraShdr Load(IReadable reader)
{
var shdr = new HydraShdr();
shdr.SampleName = reader.Read8BitStringLength(20);
shdr.Start = reader.ReadUInt32LE();
shdr.End = reader.ReadUInt32LE();
shdr.StartLoop = reader.ReadUInt32LE();
shdr.EndLoop = reader.ReadUInt32LE();
shdr.SampleRate = reader.ReadUInt32LE();
shdr.OriginalPitch = (byte)reader.ReadByte();
shdr.PitchCorrection = reader.ReadSignedByte();
shdr.SampleLink = reader.ReadUInt16LE();
shdr.SampleType = reader.ReadUInt16LE();
return(shdr);
}
public int ReadBit()
{
// need a new byte?
if (_position >= ByteSize)
{
_currentByte = _source.ReadByte();
if (_currentByte == -1)
{
throw new EndOfReaderException();
}
_position = 0;
}
// shift the desired byte to the least significant bit and
// get the value using masking
var value = (_currentByte >> (ByteSize - _position - 1)) & 0x01;
_position++;
return(value);
}
private static MidiEvent ReadSystemCommonMessage(IReadable input, int delta, byte status)
{
switch ((SystemCommonTypeEnum)status)
{
case SystemCommonTypeEnum.SystemExclusive2:
case SystemCommonTypeEnum.SystemExclusive:
{
var maker = input.ReadInt16BE();
if (maker == 0x0)
{
maker = input.ReadInt16BE();
}
else if (maker == 0xF7)
return null;
var data = new FastList<byte>();
var b = input.ReadByte();
while (b != 0xF7)
{
data.Add((byte)b);
b = input.ReadByte();
}
return new SystemExclusiveEvent(delta, status, maker, data.ToArray());
}
case SystemCommonTypeEnum.MtcQuarterFrame:
return new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0);
case SystemCommonTypeEnum.SongPosition:
return new SystemCommonEvent(delta, status, (byte)input.ReadByte(), (byte)input.ReadByte());
case SystemCommonTypeEnum.SongSelect:
return new SystemCommonEvent(delta, status, (byte)input.ReadByte(), 0);
case SystemCommonTypeEnum.TuneRequest:
return new SystemCommonEvent(delta, status, 0, 0);
default:
throw new Exception("The system common message was invalid or unsupported : " + status);
}
}
private static MidiEvent ReadMetaMessage(IReadable input, int delta, byte status)
{
var metaStatus = input.ReadByte();
switch ((MetaEventTypeEnum)metaStatus)
{
case MetaEventTypeEnum.SequenceNumber:
{
var count = input.ReadByte();
if (count == 0)
{
return(new MetaNumberEvent(delta, status, (byte)metaStatus, -1));
}
else if (count == 2)
{
return(new MetaNumberEvent(delta, status, (byte)metaStatus, input.ReadInt16BE()));
}
else
{
throw new Exception("Invalid sequence number event.");
}
}
case MetaEventTypeEnum.TextEvent:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.CopyrightNotice:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.SequenceOrTrackName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.InstrumentName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.LyricText:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.MarkerText:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.CuePoint:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.PatchName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.PortName:
return(new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input)));
case MetaEventTypeEnum.MidiChannel:
if (input.ReadByte() != 1)
{
throw new Exception("Invalid midi channel event. Expected size of 1.");
}
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.MidiPort:
if (input.ReadByte() != 1)
{
throw new Exception("Invalid midi port event. Expected size of 1.");
}
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.EndOfTrack:
return(new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte()));
case MetaEventTypeEnum.Tempo:
if (input.ReadByte() != 3)
{
throw new Exception("Invalid tempo event. Expected size of 3.");
}
return(new MetaNumberEvent(delta, status, (byte)metaStatus, (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte()));
case MetaEventTypeEnum.SmpteOffset:
if (input.ReadByte() != 5)
{
throw new Exception("Invalid smpte event. Expected size of 5.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.TimeSignature:
if (input.ReadByte() != 4)
{
throw new Exception("Invalid time signature event. Expected size of 4.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.KeySignature:
if (input.ReadByte() != 2)
{
throw new Exception("Invalid key signature event. Expected size of 2.");
}
return(new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte()));
case MetaEventTypeEnum.SequencerSpecific:
var length = ReadVariableLength(input);
var data = input.ReadByteArray(length);
return(new MetaDataEvent(delta, status, (byte)metaStatus, data));
}
throw new Exception("Not a valid meta message Status: " + status + " Meta: " + metaStatus);
}
private MidiTrack ReadTrack(IReadable input)
{
var instList = new FastList <Byte>();
var drumList = new FastList <Byte>();
var channelList = new FastList <Byte>();
var eventList = new FastList <MidiEvent>();
var noteOnCount = 0;
var totalTime = 0;
while (input.Read8BitChars(4) != "MTrk")
{
var length = input.ReadInt32BE();
while (length > 0)
{
length--;
input.ReadByte();
}
}
var endPosition = input.ReadInt32BE() + input.Position;
var prevStatus = 0;
while (input.Position < endPosition)
{
var delta = ReadVariableLength(input);
totalTime += delta;
var status = input.ReadByte();
if (status >= 0x80 && status <= 0xEF)
{//voice message
prevStatus = status;
eventList.Add(ReadVoiceMessage(input, delta, (byte)status, (byte)input.ReadByte()));
noteOnCount = TrackVoiceStats(eventList[eventList.Count - 1], instList, drumList, channelList, noteOnCount);
}
else if (status >= 0xF0 && status <= 0xF7)
{//system common message
prevStatus = 0;
eventList.Add(ReadSystemCommonMessage(input, delta, (byte)status));
}
else if (status >= 0xF8 && status <= 0xFF)
{//realtime message
eventList.Add(ReadRealTimeMessage(input, delta, (byte)status));
}
else
{ //data bytes
if (prevStatus == 0)
{ //if no running status continue to next status byte
while ((status & 0x80) != 0x80)
{
status = input.ReadByte();
}
if (status >= 0x80 && status <= 0xEF)
{//voice message
prevStatus = status;
eventList.Add(ReadVoiceMessage(input, delta, (byte)status, (byte)input.ReadByte()));
noteOnCount = TrackVoiceStats(eventList[eventList.Count - 1], instList, drumList, channelList, noteOnCount);
}
else if (status >= 0xF0 && status <= 0xF7)
{//system common message
eventList.Add(ReadSystemCommonMessage(input, delta, (byte)status));
}
else if (status >= 0xF8 && status <= 0xFF)
{//realtime message
eventList.Add(ReadRealTimeMessage(input, delta, (byte)status));
}
}
else
{//otherwise apply running status
eventList.Add(ReadVoiceMessage(input, delta, (byte)prevStatus, (byte)status));
noteOnCount = TrackVoiceStats(eventList[eventList.Count - 1], instList, drumList, channelList, noteOnCount);
}
}
}
if (input.Position != endPosition)
{
throw new Exception("The track length was invalid for the current MTrk chunk.");
}
if (channelList.IndexOf(MidiHelper.DrumChannel) != -1)
{
if (drumList.IndexOf(0) == -1)
{
drumList.Add(0);
}
}
else
{
if (instList.IndexOf(0) == -1)
{
instList.Add(0);
}
}
var track = new MidiTrack(instList.ToArray(),
drumList.ToArray(),
channelList.ToArray(),
eventList.ToArray());
track.NoteOnCount = noteOnCount;
track.EndTime = totalTime;
return(track);
}
/// <summary>
/// Skips an integer (4byte) and reads a string using
/// a bytesize
/// </summary>
/// <returns></returns>
public static string GpReadStringIntUnused(this IReadable data)
{
data.Skip(4);
return(data.GpReadString(data.ReadByte()));
}
private bool FindHead(IReadable input, int attempts)
{
var match = 0;
while (attempts > 0)
{
switch (input.ReadByte())
{
case (int)'M':
match = 1;
break;
case (int)'T':
match = match == 1 ? 2 : 0;
break;
case (int)'h':
match = match == 2 ? 3 : 0;
break;
case (int)'d':
if (match == 3) return true;
match = 0;
break;
}
attempts--;
}
return false;
}
public static bool GpReadBool(this IReadable data)
{
return(data.ReadByte() != 0);
}
public static int ReadSInt8(this IReadable input)
{
var v = input.ReadByte();
return((((v & 255) >> 7) * (-256)) + (v & 255));
}
private static MidiEvent ReadVoiceMessage(IReadable input, int delta, byte status, byte data1)
{
switch ((MidiEventTypeEnum)(status & 0xF0))
{
case MidiEventTypeEnum.NoteOff:
return new MidiEvent(delta, status, data1, (byte)input.ReadByte());
case MidiEventTypeEnum.NoteOn:
var velocity = input.ReadByte();
if (velocity == 0)
status = (byte)((status & 0x0F) | 0x80);
return new MidiEvent(delta, status, data1, (byte)velocity);
case MidiEventTypeEnum.NoteAftertouch:
return new MidiEvent(delta, status, data1, (byte)input.ReadByte());
case MidiEventTypeEnum.Controller:
return new MidiEvent(delta, status, data1, (byte)input.ReadByte());
case MidiEventTypeEnum.ProgramChange:
return new MidiEvent(delta, status, data1, 0);
case MidiEventTypeEnum.ChannelAftertouch:
return new MidiEvent(delta, status, data1, 0);
case MidiEventTypeEnum.PitchBend:
return new MidiEvent(delta, status, data1, (byte)input.ReadByte());
default:
throw new Exception("The status provided was not that of a voice message.");
}
}
private static int ReadVariableLength(IReadable input)
{
var value = 0;
int next;
do
{
next = input.ReadByte();
value = value << 7;
value = value | (next & 0x7F);
} while ((next & 0x80) == 0x80);
return value;
}
public override HaxeInt ReadByte()
{
return(_readable.ReadByte());
}
public SoundFontSampleData(IReadable input)
{
var id = input.Read8BitChars(4);
var size = input.ReadInt32LE();
if (id.ToLower() != "list")
{
throw new Exception("Invalid soundfont. Could not find sdta LIST chunk.");
}
var readTo = input.Position + size;
id = input.Read8BitChars(4);
if (id.ToLower() != "sdta")
{
throw new Exception("Invalid soundfont. The LIST chunk is not of type sdta.");
}
BitsPerSample = 0;
byte[] rawSampleData = null;
while (input.Position < readTo)
{
var subID = input.Read8BitChars(4);
size = input.ReadInt32LE();
switch (subID.ToLower())
{
case "smpl":
BitsPerSample = 16;
rawSampleData = input.ReadByteArray(size);
break;
case "sm24":
if (rawSampleData == null || size != Math.Ceiling(SampleData.Length / 2.0))
{ //ignore this chunk if wrong size or if it comes first
input.Skip(size);
}
else
{
BitsPerSample = 24;
for (var x = 0; x < SampleData.Length; x++)
{
var b = new byte[3];
b[0] = (byte)input.ReadByte();
b[1] = rawSampleData[2 * x];
b[2] = rawSampleData[2 * x + 1];
}
}
if (size % 2 == 1)
{
if (input.ReadByte() != 0)
{
input.Position--;
}
}
break;
default:
throw new Exception("Invalid soundfont. Unknown chunk id: " + subID + ".");
}
}
if (BitsPerSample == 16)
{
SampleData = rawSampleData;
}
else if (BitsPerSample != 24)
{
throw new Exception("Only 16 and 24 bit samples are supported.");
}
}
private static MidiEvent ReadMetaMessage(IReadable input, int delta, byte status)
{
var metaStatus = input.ReadByte();
switch ((MetaEventTypeEnum)metaStatus)
{
case MetaEventTypeEnum.SequenceNumber:
{
var count = input.ReadByte();
if (count == 0)
return new MetaNumberEvent(delta, status, (byte)metaStatus, -1);
else if (count == 2)
{
return new MetaNumberEvent(delta, status, (byte)metaStatus, input.ReadInt16BE());
}
else
throw new Exception("Invalid sequence number event.");
}
case MetaEventTypeEnum.TextEvent:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.CopyrightNotice:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.SequenceOrTrackName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.InstrumentName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.LyricText:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.MarkerText:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.CuePoint:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.PatchName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.PortName:
return new MetaTextEvent(delta, status, (byte)metaStatus, ReadString(input));
case MetaEventTypeEnum.MidiChannel:
if (input.ReadByte() != 1)
throw new Exception("Invalid midi channel event. Expected size of 1.");
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.MidiPort:
if (input.ReadByte() != 1)
throw new Exception("Invalid midi port event. Expected size of 1.");
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.EndOfTrack:
return new MetaEvent(delta, status, (byte)metaStatus, (byte)input.ReadByte());
case MetaEventTypeEnum.Tempo:
if (input.ReadByte() != 3)
throw new Exception("Invalid tempo event. Expected size of 3.");
return new MetaNumberEvent(delta, status, (byte)metaStatus, (input.ReadByte() << 16) | (input.ReadByte() << 8) | input.ReadByte());
case MetaEventTypeEnum.SmpteOffset:
if (input.ReadByte() != 5)
throw new Exception("Invalid smpte event. Expected size of 5.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.TimeSignature:
if (input.ReadByte() != 4)
throw new Exception("Invalid time signature event. Expected size of 4.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.KeySignature:
if (input.ReadByte() != 2)
throw new Exception("Invalid key signature event. Expected size of 2.");
return new MetaTextEvent(delta, status, (byte)metaStatus, input.ReadByte() + ":" + input.ReadByte());
case MetaEventTypeEnum.SequencerSpecific:
var length = ReadVariableLength(input);
var data = input.ReadByteArray(length);
return new MetaDataEvent(delta, status, (byte)metaStatus, data);
}
throw new Exception("Not a valid meta message Status: " + status + " Meta: " + metaStatus);
}
public static sbyte ReadSignedByte(this IReadable readable)
{
return(unchecked ((sbyte)(byte)readable.ReadByte()));
}
private MidiTrack ReadTrack(IReadable input)
{
var instList = new FastList<Byte>();
var drumList = new FastList<Byte>();
var channelList = new FastList<Byte>();
var eventList = new FastList<MidiEvent>();
var noteOnCount = 0;
var totalTime = 0;
while (input.Read8BitChars(4) != "MTrk")
{
var length = input.ReadInt32BE();
while (length > 0)
{
length--;
input.ReadByte();
}
}
var endPosition = input.ReadInt32BE() + input.Position;
var prevStatus = 0;
while (input.Position < endPosition)
{
var delta = ReadVariableLength(input);
totalTime += delta;
var status = input.ReadByte();
if (status >= 0x80 && status <= 0xEF)
{//voice message
prevStatus = status;
eventList.Add(ReadVoiceMessage(input, delta, (byte)status, (byte)input.ReadByte()));
noteOnCount = TrackVoiceStats(eventList[eventList.Count - 1], instList, drumList, channelList, noteOnCount);
}
else if (status >= 0xF0 && status <= 0xF7)
{//system common message
prevStatus = 0;
eventList.Add(ReadSystemCommonMessage(input, delta, (byte)status));
}
else if (status >= 0xF8 && status <= 0xFF)
{//realtime message
eventList.Add(ReadRealTimeMessage(input, delta, (byte)status));
}
else
{//data bytes
if (prevStatus == 0)
{//if no running status continue to next status byte
while ((status & 0x80) != 0x80)
{
status = input.ReadByte();
}
if (status >= 0x80 && status <= 0xEF)
{//voice message
prevStatus = status;
eventList.Add(ReadVoiceMessage(input, delta, (byte)status, (byte)input.ReadByte()));
noteOnCount = TrackVoiceStats(eventList[eventList.Count - 1], instList, drumList, channelList, noteOnCount);
}
else if (status >= 0xF0 && status <= 0xF7)
{//system common message
eventList.Add(ReadSystemCommonMessage(input, delta, (byte)status));
}
else if (status >= 0xF8 && status <= 0xFF)
{//realtime message
eventList.Add(ReadRealTimeMessage(input, delta, (byte)status));
}
}
else
{//otherwise apply running status
eventList.Add(ReadVoiceMessage(input, delta, (byte)prevStatus, (byte)status));
noteOnCount = TrackVoiceStats(eventList[eventList.Count - 1], instList, drumList, channelList, noteOnCount);
}
}
}
if (input.Position != endPosition)
throw new Exception("The track length was invalid for the current MTrk chunk.");
if (channelList.IndexOf(MidiHelper.DrumChannel) != -1)
{
if (drumList.IndexOf(0) == -1)
drumList.Add(0);
}
else
{
if (instList.IndexOf(0) == -1)
instList.Add(0);
}
var track = new MidiTrack(instList.ToArray(),
drumList.ToArray(),
channelList.ToArray(),
eventList.ToArray());
track.NoteOnCount = noteOnCount;
track.EndTime = totalTime;
return track;
}
