//--Private Methods private void loadStream(Stream stream) { combinedTrack = null; byte[] tmp = new byte[4]; stream.Read(tmp, 0, 4); if (UTF8Encoding.UTF8.GetString(tmp, 0, tmp.Length) != "MThd") { throw new Exception("Not a valid midi file!"); } mheader = new MidiHeader(); //Read header length then discard, since the header's length always 6 stream.Read(tmp, 0, 4); //Array.Reverse(tmp); //int headerLength = BitConverter.ToInt32(tmp, 0); //Read midi format tmp = new byte[2]; stream.Read(tmp, 0, 2); Array.Reverse(tmp); mheader.setMidiFormat(BitConverter.ToInt16(tmp, 0)); //Read Track Count stream.Read(tmp, 0, 2); Array.Reverse(tmp); int trackCount = BitConverter.ToInt16(tmp, 0); tracks = new MidiTrack[trackCount]; //Read Delta time stream.Read(tmp, 0, 2); Array.Reverse(tmp); int delta = BitConverter.ToInt16(tmp, 0); mheader.deltaTicksPerQuarterNote = (delta & 0x7FFF); //Time Format mheader.TimeFormat = ((delta & 0x8000) > 0) ? MidiHelper.MidiTimeFormat.FamesPerSecond : MidiHelper.MidiTimeFormat.TicksPerBeat; //Begin Reading Each Track for (int x = 0; x < trackCount; x++) { List <byte> Programs = new List <byte>(); List <byte> DrumPrograms = new List <byte>(); List <MidiEvent> midiEvList = new List <MidiEvent>(); tracks[x] = new MidiTrack(); //assume the track uses program at 0 in case no program changes are used Programs.Add(0); DrumPrograms.Add(0); tmp = new byte[4]; //is valid MIDI track? stream.Read(tmp, 0, 4); if (UTF8Encoding.UTF8.GetString(tmp, 0, tmp.Length) != "MTrk") { throw new Exception("Invalid track!"); } //read track's length in byte stream.Read(tmp, 0, 4); Array.Reverse(tmp); //Reverse the bytes int TrackLength = BitConverter.ToInt32(tmp, 0); //Read The Rest of The Track tmp = new byte[TrackLength]; stream.Read(tmp, 0, TrackLength); //read index int index = 0; byte prevByte = 0; int prevChan = 0; ulong lastDeltaTimeFromStart = 0; while (index < tmp.Length) { UInt16 numofbytes = 0; //UInt32 ScrmbledDta = BitConverter.ToUInt32(tmp, index); MidiEvent MEv = new MidiEvent(); //delta time MEv.deltaTime = MEv.sampleTime = ReadDeltaTime(tmp, index, ref numofbytes); //update delta time from start MEv.deltaTimeFromStart = lastDeltaTimeFromStart += MEv.deltaTime; lastDeltaTimeFromStart = MEv.deltaTimeFromStart; //MEv.sampleTime = GetTime(ScrmbledDta, ref numofbytes); //index += 4 - (4 - numofbytes); // deduce bytes used when reading delta time index += numofbytes; byte statusByte = tmp[index]; int CHANNEL = GetChannel(statusByte); if (statusByte < 0x80) { statusByte = prevByte; CHANNEL = prevChan; index--; } if (statusByte != 0xFF) { statusByte &= 0xF0; } prevByte = statusByte; prevChan = CHANNEL; switch (statusByte) { case 0x80: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Note_Off; ++index; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; MEv.parameter1 = tmp[index++]; MEv.parameter2 = tmp[index++]; MEv.Parameters[1] = MEv.parameter1; MEv.Parameters[2] = MEv.parameter2; } break; case 0x90: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Note_On; ++index; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; MEv.parameter1 = tmp[index++]; MEv.parameter2 = tmp[index++]; MEv.Parameters[1] = MEv.parameter1; MEv.Parameters[2] = MEv.parameter2; if (MEv.parameter2 == 0x00) //Setting velocity to 0 is actually just turning the note off. { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Note_Off; } tracks[x].notesPlayed++; } break; case 0xA0: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Note_Aftertouch; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; ++index; MEv.parameter1 = tmp[++index]; //note number MEv.parameter2 = tmp[++index]; //Amount } break; case 0xB0: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Controller; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; ++index; MEv.parameter1 = tmp[index++]; //type MEv.parameter2 = tmp[index++]; //value MEv.Parameters[1] = MEv.parameter1; MEv.Parameters[2] = MEv.parameter2; } break; case 0xC0: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Program_Change; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; ++index; MEv.parameter1 = tmp[index++]; MEv.Parameters[1] = MEv.parameter1; //record which programs are used by the track if (MEv.channel != 9) { if (Programs.Contains(MEv.parameter1) == false) { Programs.Add(MEv.parameter1); } } else { if (DrumPrograms.Contains(MEv.parameter1) == false) { DrumPrograms.Add(MEv.parameter1); } } } break; case 0xD0: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Channel_Aftertouch; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; ++index; //Amount MEv.parameter1 = tmp[++index]; } break; case 0xE0: { MEv.midiChannelEvent = MidiHelper.MidiChannelEvent.Pitch_Bend; MEv.channel = (byte)CHANNEL; MEv.Parameters[0] = MEv.channel; ++index; MEv.parameter1 = tmp[++index]; MEv.parameter2 = tmp[++index]; ushort s = (ushort)MEv.parameter1; s <<= 7; s |= (ushort)MEv.parameter2; MEv.Parameters[1] = ((double)s - 8192.0) / 8192.0; } break; case 0xFF: statusByte = tmp[++index]; switch (statusByte) { case 0x00: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Sequence_Number; ++index; break; case 0x01: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Text_Event; ++index; //Get the length of the string MEv.parameter1 = tmp[index++]; MEv.Parameters[0] = MEv.parameter1; //Set the string in the parameter list MEv.Parameters[1] = UTF8Encoding.UTF8.GetString(tmp, index, ((int)tmp[index - 1])); index += (int)tmp[index - 1]; break; case 0x02: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Copyright_Notice; ++index; //Get the length of the string MEv.parameter1 = tmp[index++]; MEv.Parameters[0] = MEv.parameter1; //Set the string in the parameter list MEv.Parameters[1] = UTF8Encoding.UTF8.GetString(tmp, index, ((int)tmp[index - 1])); index += (int)tmp[index - 1]; break; case 0x03: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Sequence_Or_Track_Name; ++index; //Get the length of the string MEv.parameter1 = tmp[index++]; MEv.Parameters[0] = MEv.parameter1; //Set the string in the parameter list and also the name of this track MEv.Parameters[1] = tracks[x].trackName = UTF8Encoding.UTF8.GetString(tmp, index, ((int)tmp[index - 1])); index += (int)tmp[index - 1]; break; case 0x04: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Instrument_Name; ++index; //Set the instrument name MEv.Parameters[0] = UTF8Encoding.UTF8.GetString(tmp, index + 1, (int)tmp[index]); index += (int)tmp[index] + 1; break; case 0x05: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Lyric_Text; ++index; //Set the lyric string MEv.Parameters[0] = tracks[x].lyricText = UTF8Encoding.UTF8.GetString(tmp, index + 1, (int)tmp[index]); index += (int)tmp[index] + 1; break; case 0x06: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Marker_Text; ++index; //Set the marker MEv.Parameters[0] = tracks[x].markerText = UTF8Encoding.UTF8.GetString(tmp, index + 1, (int)tmp[index]); index += (int)tmp[index] + 1; break; case 0x07: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Cue_Point; ++index; //Set the cue point MEv.Parameters[0] = UTF8Encoding.UTF8.GetString(tmp, index + 1, (int)tmp[index]); index += (int)tmp[index] + 1; break; case 0x20: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Midi_Channel_Prefix_Assignment; index++; //Get the length of the data MEv.parameter1 = tmp[index++]; MEv.Parameters[0] = MEv.parameter1; //Set the string in the parameter list MEv.Parameters[1] = tmp[index++]; break; case 0x2F: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.End_of_Track; index += 2; break; case 0x51: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Tempo; ++index; //Get the length of the data MEv.Parameters[4] = tmp[index++]; //Put the data into an array byte[] mS = new byte[4]; for (int i = 0; i < 3; i++) { mS[i + 1] = tmp[i + index]; } index += 3; //Put it into a readable format byte[] mS2 = new byte[4]; for (int i = 0; i < 4; i++) { mS2[3 - i] = mS[i]; } //Get the value from the array UInt32 Val = BitConverter.ToUInt32(mS2, 0); //Set the value MEv.Parameters[0] = Val; break; case 0x54: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Smpte_Offset; ++index; int v = tmp[index++]; if (v >= 4) { for (int i = 0; i < 4; i++) { MEv.Parameters[i] = tmp[index++]; } } else { for (int i = 0; i < v; i++) { MEv.Parameters[i] = tmp[index++]; } } for (int i = 4; i < v; i++) { index++; } break; case 0x58: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Time_Signature; ++index; int v1 = tmp[index++]; if (v1 >= 4) { for (int i = 0; i < 4; i++) { MEv.Parameters[i] = tmp[index++]; } } else { for (int i = 0; i < v1; i++) { MEv.Parameters[i] = tmp[index++]; } } for (int i = 4; i < v1; i++) { index++; } break; case 0x59: MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Key_Signature; ++index; int v2 = tmp[index++]; if (v2 >= 4) { for (int i = 0; i < 4; i++) { MEv.Parameters[i] = tmp[index++]; } } else { for (int i = 0; i < v2; i++) { MEv.Parameters[i] = tmp[index++]; } } for (int i = 4; i < v2; i++) { index++; } break; case 0x7F: //Sequencer specific events MEv.midiMetaEvent = MidiHelper.MidiMetaEvent.Sequencer_Specific_Event; ++index; //increment the indexer //Get the length of the data MEv.Parameters[4] = tmp[index++]; //Get the byte length byte[] len = new byte[(byte)MEv.Parameters[4]]; //get the byte info for (int i = 0; i < len.Length; i++) { len[i] = tmp[index++]; } MEv.Parameters[0] = len; break; } break; //System exclusive case 0xF0: while (tmp[index] != 0xF7) { index++; } index++; break; } midiEvList.Add(MEv); //MEv.deltaTimeFromStart = tracks[x].totalTime; tracks[x].totalTime = tracks[x].totalTime + MEv.sampleTime; } tracks[x].programs = Programs.ToArray(); tracks[x].drumPrograms = DrumPrograms.ToArray(); tracks[x].midiEvents = midiEvList.ToArray(); } }
public void CombineTracks() { if (tracks.Length < 2) { return; } int total_eventCount = 0; UInt64 total_notesPlayed = 0; List <byte> programsUsed = new List <byte>(); List <byte> DrumprogramsUsed = new List <byte>(); //Loop to get track info for (int x = 0; x < tracks.Length; x++) { total_eventCount = total_eventCount + tracks[x].midiEvents.Length; total_notesPlayed = total_notesPlayed + tracks[x].notesPlayed; for (int x2 = 0; x2 < tracks[x].programs.Length; x2++) { if (programsUsed.Contains(tracks[x].programs[x2]) == false) { programsUsed.Add(tracks[x].programs[x2]); } } for (int x2 = 0; x2 < tracks[x].drumPrograms.Length; x2++) { if (DrumprogramsUsed.Contains(tracks[x].drumPrograms[x2]) == false) { DrumprogramsUsed.Add(tracks[x].drumPrograms[x2]); } } } //Now process the midi events Dictionary <uint, LinkedList <MidiEvent> > orderedTracks = new Dictionary <uint, LinkedList <MidiEvent> >(total_eventCount); for (int x = 0; x < tracks.Length; x++) { uint currentDeltaTime = 0; MidiEvent[] trackMidiEvents = new MidiEvent[tracks[x].midiEvents.Length]; tracks[x].midiEvents.CopyTo(trackMidiEvents, 0); for (int x2 = 0; x2 < trackMidiEvents.Length; x2++) { currentDeltaTime = currentDeltaTime + trackMidiEvents[x2].sampleTime; trackMidiEvents[x2].sampleTime = currentDeltaTime; if (orderedTracks.ContainsKey(trackMidiEvents[x2].sampleTime) == true) { orderedTracks[trackMidiEvents[x2].sampleTime].AddLast(trackMidiEvents[x2]); } else { LinkedList <MidiEvent> tmplist = new LinkedList <MidiEvent>(); tmplist.AddLast(trackMidiEvents[x2]); orderedTracks.Add(trackMidiEvents[x2].sampleTime, tmplist); } } } //Sort the Dictionary uint[] keys = new uint[orderedTracks.Keys.Count]; orderedTracks.Keys.CopyTo(keys, 0); Array.Sort(keys); //mirror the events to appropriate timeline LinkedList <MidiEvent>[] trackEvents = new LinkedList <MidiEvent> [orderedTracks.Values.Count]; for (int x = 0; x < trackEvents.Length; x++) { trackEvents[x] = orderedTracks[keys[x]]; } orderedTracks.Clear(); keys = null; //separate combined tracks into a new one combinedTrack = new MidiTrack(); combinedTrack.programs = programsUsed.ToArray(); combinedTrack.drumPrograms = DrumprogramsUsed.ToArray(); combinedTrack.midiEvents = new MidiEvent[total_eventCount]; uint PreviousDeltaTime = 0; uint cc = 0; for (int x = 0; x < trackEvents.Length; x++) { LinkedListNode <MidiEvent> tmpN = trackEvents[x].First; while (tmpN != null) { uint old1 = tmpN.Value.sampleTime; tmpN.Value.sampleTime = (tmpN.Value.sampleTime - PreviousDeltaTime); PreviousDeltaTime = old1; combinedTrack.midiEvents[cc] = tmpN.Value; combinedTrack.totalTime = combinedTrack.totalTime + (ulong)tmpN.Value.sampleTime; tmpN = tmpN.Next; cc++; } } combinedTrack.notesPlayed = (uint)total_notesPlayed; }