/// <summary>
/// In MIDI Format 1, this would be the first track (index = 0).
/// Otherwise Format 0: index = 0 and with
/// Format 2, each track will essentially be like a Format 0 track.
///
/// This method collects information from the 'tempo map' track such as
///
/// - Tempo Information
/// - SMPTE Offset
/// - Time Signature
/// - Key Signatuer
/// - Sequencer Specific Data
/// - System Exclusive Data (in tempo map)
/// </summary>
int GetTempoMap(int nTrackIndex, int nTrackOffset, int delta)
{
int DELTA_Returned = delta;
var msg16 = FileHandle.Get16Bit(nTrackIndex, nTrackOffset);
byte msg8 = (byte)(msg16 & 0xFF);
CurrentStatus = msg16; // This is just an attempt at aligning running status.
// var hexMsg = $"{msg16:X2}";
if (msg16 >= 0xFF00 && msg16 <= 0xFF0C)
{
DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset);
return(++DELTA_Returned);
}
switch (msg16)
{
// text
case Stat16.SequenceNumber: // 0xFF00
case Stat16.ChannelPrefix: // 0xFF20
case Stat16.PortMessage: /* 0xFF21 */ DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset); break;
case Stat16.EndOfTrack: /* 0xFF2F */ DELTA_Returned = FileHandle.Tracks[nTrackIndex].Data.Length - 1; break;
case Stat16.SetTempo: // 0xFF51
var muspqn = FileHandle[ReaderIndex].ReadU24(nTrackOffset + 3);
TempoMap.Push(muspqn, Division, CurrentTrackPulse);
DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset);
break;
case Stat16.SMPTEOffset: // 0xFF54
SMPTE.SetSMPTE(
FileHandle.Tracks[nTrackIndex].Data[nTrackOffset + 3],
FileHandle.Tracks[nTrackIndex].Data[nTrackOffset + 4],
FileHandle.Tracks[nTrackIndex].Data[nTrackOffset + 5],
FileHandle.Tracks[nTrackIndex].Data[nTrackOffset + 6],
FileHandle.Tracks[nTrackIndex].Data[nTrackOffset + 7]
);
DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset);
break;
case Stat16.TimeSignature: // 0xFF58
TimeSignature.SetSignature(
(int)this[nTrackIndex, nTrackOffset + 3],
(int)Math.Pow(-this[nTrackIndex, nTrackOffset + 4], 2),
(int)this[nTrackIndex, nTrackOffset + 5],
(int)this[nTrackIndex, nTrackOffset + 6]
);
DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset);
break;
case Stat16.KeySignature: // 0xFF59
KeySignature.SetSignature(
this[nTrackIndex, nTrackOffset + 3],
this[nTrackIndex, nTrackOffset + 4]);
DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset);
break;
case Stat16.SequencerSpecific_70: // 0xFF70
case Stat16.SequencerSpecific_71: // 0xFF71
case Stat16.SequencerSpecific_72: // 0xFF72
case Stat16.SequencerSpecific_73: // 0xFF73
case Stat16.SequencerSpecific_74: // 0xFF74
case Stat16.SequencerSpecific_75: // 0xFF75
case Stat16.SequencerSpecific_76: // 0xFF76
case Stat16.SequencerSpecific_77: // 0xFF77
case Stat16.SequencerSpecific_78: // 0xFF78
case Stat16.SequencerSpecific_79: // 0xFF79
case Stat16.SequencerSpecific_7A: // 0xFF7A
case Stat16.SequencerSpecific_7B: // 0xFF7B
case Stat16.SequencerSpecific_7C: // 0xFF7C
case Stat16.SequencerSpecific_7D: // 0xFF7D
case Stat16.SequencerSpecific_7E: // 0xFF7E
case Stat16.SequencerSpecific: // 0xFF7F
DELTA_Returned = FileHandle.Tracks[nTrackIndex].DeltaSeek(nTrackOffset);
break;
case Stat16.SystemExclusive:
var pLastIndex = FileHandle[nTrackIndex].GetEndOfSystemExclusive(nTrackOffset);
DELTA_Returned = pLastIndex;
break;
default:
{
if (FileHandle.Tracks[nTrackIndex].Data[nTrackOffset] < 0x80)
{
CurrentStatus = CurrentRunningStatus16;
// Running Status
// int ExpandedRSE = CurrentTrackRunningStatus;// << 8;
int ExpandedRSE = CurrentRunningStatus8;// << 8;
int delta1 = -1;
if ((delta1 = Increment(nTrackOffset)) == -1)
{
int test = GetOffset(nTrackIndex, nTrackOffset);
Debug.Assert(false, string.Format("warning… {0:X2}, {1:X}|{1:N0}", ExpandedRSE, test));
}
else
{
DELTA_Returned = delta1;
}
}
else if (StatusQuery.IsMidiMessage(msg8))
{
CurrentRunningStatus8 = msg8;
CurrentRunningStatus16 = msg16;
DELTA_Returned = Increment(nTrackOffset + 1);
return(++DELTA_Returned);
}
else
{
throw new FormatException("Bad format!\nThere is probably a problem with the Input File unless we made an error reading it!)");
}
}
break;
}
return(++DELTA_Returned);
}
