public JaiEventType loadNextOp()
{
if (OpcodeAddressStack.Count == 16)
{
OpcodeAddressStack.Dequeue();
}
if (OpcodeHistory.Count == 16)
{
OpcodeHistory.Dequeue();
}
OpcodeAddressStack.Enqueue((int)Sequence.BaseStream.Position); // push address to FIFO stack.
State.current_address = (int)Sequence.BaseStream.Position;
byte current_opcode = Sequence.ReadByte(); // Reads the current byte in front of the cursor.
last_opcode = current_opcode;
OpcodeHistory.Enqueue(current_opcode); // push opcode to FIFO stack
if (current_opcode < 0x80)
{
State.note = current_opcode; // The note on event is laid out like a piano with 127 (0x7F1) keys.
// So this means that the first 0x80 bytes are just pressing the individual keys.
State.voice = Sequence.ReadByte(); // The next byte tells the voice, 0-8
State.vel = Sequence.ReadByte(); // And finally, the next byte will tell the velocity
return(JaiEventType.NOTE_ON); // Return the note on event.
}
else if (current_opcode == (byte)JaiSeqEvent.WAIT_8) // Contrast to above, the opcode between these two is WAIT_U8
{
State.delay += Sequence.ReadByte(); // Add u8 ticks to the delay.
return(JaiEventType.DELAY);
}
else if (current_opcode < 0x88) // We already check if it's 0x80, so anything between here will be 0x81 and 0x87
{
// Only the first 7 bits are going to determine which voice we're stopping.
State.voice = (byte)(current_opcode & 0x7F);
return(JaiEventType.NOTE_OFF);
}
else // Finally, we can fall into our CASE statement.
{
switch (current_opcode)
{
/* Delays and waits */
case (byte)JaiSeqEvent.WAIT_16: // Wait (UInt16)
State.delay = Sequence.ReadUInt16(); // Add to the state delay
return(JaiEventType.DELAY);
case (byte)JaiSeqEvent.WAIT_VAR: // Wait (VLQ) see readVlq function.
State.delay += Helpers.ReadVLQ(Sequence);
return(JaiEventType.DELAY);
/* Logical jumps */
case (byte)JaiSeqEvent.JUMP: // Unconditional jump
State.jump_mode = 0; // Set jump mode to 0
State.jump_address = Sequence.ReadInt32(); // Absolute address.
return(JaiEventType.JUMP);
case (byte)JaiSeqEvent.JUMP_COND: // Jump based on mode
State.jump_mode = Sequence.ReadByte();
State.jump_address = (int)Helpers.ReadUInt24BE(Sequence); // pointer
return(JaiEventType.JUMP);
case (byte)JaiSeqEvent.RET_COND:
State.jump_mode = Sequence.ReadByte();
return(JaiEventType.RET);
case (byte)JaiSeqEvent.CALL_COND:
State.jump_mode = Sequence.ReadByte();
State.jump_address = (int)Helpers.ReadUInt24BE(Sequence);
return(JaiEventType.CALL);
case (byte)JaiSeqEvent.RET:
return(JaiEventType.RET);
/* Tempo Control */
case (byte)JaiSeqEvent.J2_SET_ARTIC: // The very same.
{
var type = Sequence.ReadByte();
var val = Sequence.ReadInt16();
if (type == 0x62)
{
State.ppqn = val;
}
return(JaiEventType.TIME_BASE);
}
case (byte)JaiSeqEvent.TIME_BASE: // Set ticks per quarter note.
State.ppqn = (short)(Sequence.ReadInt16() - 40);
Console.WriteLine("Timebase ppqn set {0}", State.ppqn);
return(JaiEventType.TIME_BASE);
case (byte)JaiSeqEvent.J2_TEMPO: // Set BPM, Same format
case (byte)JaiSeqEvent.TEMPO: // Set BPM
State.bpm = Sequence.ReadInt16();
return(JaiEventType.TIME_BASE);
/* Track Control */
case (byte)JaiSeqEvent.OPEN_TRACK:
State.track_id = Sequence.ReadByte();
State.track_address = (int)Helpers.ReadUInt24BE(Sequence); // Pointer to track inside of BMS file (Absolute)
return(JaiEventType.NEW_TRACK);
case (byte)JaiSeqEvent.FIN:
return(JaiEventType.HALT);
case (byte)JaiSeqEvent.J2_SET_BANK:
State.voice_bank = Sequence.ReadByte();
return(JaiEventType.BANK_CHANGE);
case (byte)JaiSeqEvent.J2_SET_PROG:
State.voice_program = Sequence.ReadByte();
return(JaiEventType.PROG_CHANGE);
/* Parameter control */
case (byte)JaiSeqEvent.J2_SET_PERF_8:
State.param = Sequence.ReadByte();
State.param_value = Sequence.ReadByte();
return(JaiEventType.PARAM);
case (byte)JaiSeqEvent.J2_SET_PERF_16:
State.param = Sequence.ReadByte();
State.param_value = Sequence.ReadInt16();
return(JaiEventType.PARAM);
case (byte)JaiSeqEvent.PARAM_SET_8: // Set track parameters (Usually used for instruments)
State.param = Sequence.ReadByte();
State.param_value = Sequence.ReadByte();
if (State.param == 0x20) // 0x20 is bank change
{
State.voice_bank = (byte)State.param_value;
return(JaiEventType.BANK_CHANGE);
}
if (State.param == 0x21) // 0x21 is program change
{
State.voice_program = (byte)State.param_value;
return(JaiEventType.PROG_CHANGE);
}
return(JaiEventType.PARAM);
case (byte)JaiSeqEvent.PARAM_SET_16: // Set track parameters (Usually used for instruments)
State.param = Sequence.ReadByte();
State.param_value = Sequence.ReadInt16();
if (State.param == 0x20) // 0x20 is bank change
{
State.voice_bank = (byte)State.param_value;
return(JaiEventType.BANK_CHANGE);
}
if (State.param == 0x21) // 0x21 is program change
{
State.voice_program = (byte)State.param_value;
return(JaiEventType.PROG_CHANGE);
}
return(JaiEventType.PARAM);
/* PERF Control*/
/* Perf structure is as follows
* <byte> type
* <?> val
* (<?> dur)
*/
case (byte)JaiSeqEvent.PERF_U8_NODUR:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadByte();
State.perf_duration = 0;
State.perf_type = 1;
State.perf_decimal = ((double)State.perf_value / 0xFFd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_U8_DUR_U8:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadByte();
State.perf_duration = Sequence.ReadByte();
State.perf_type = 1;
State.perf_decimal = ((double)State.perf_value / 0xFFd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_U8_DUR_U16:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadByte();
State.perf_duration = Sequence.ReadUInt16();
State.perf_type = 1;
State.perf_decimal = ((double)State.perf_value / 0xFFd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_S8_NODUR:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadSByte();
State.perf_duration = 0;
State.perf_type = 2;
State.perf_decimal = ((double)(State.perf_value) / 0x7Fd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_S8_DUR_U8:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadSByte();
State.perf_duration = Sequence.ReadByte();
State.perf_type = 2;
State.perf_decimal = ((double)(State.perf_value) / 0x7Fd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_S8_DUR_U16:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadSByte();
State.perf_duration = Sequence.ReadUInt16();
State.perf_type = 2;
State.perf_decimal = ((double)(State.perf_value) / 0x7Fd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_S16_NODUR:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadInt16();
State.perf_duration = 0;
State.perf_type = 3;
State.perf_decimal = ((double)(State.perf_value) / 0x7FFFd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_S16_DUR_U8:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadInt16();
State.perf_duration = Sequence.ReadByte();
State.perf_type = 3;
State.perf_decimal = ((double)(State.perf_value) / 0x7FFFd);
return(JaiEventType.PERF);
case (byte)JaiSeqEvent.PERF_S16_DUR_U16:
State.perf = Sequence.ReadByte();
State.perf_value = Sequence.ReadInt16();
State.perf_duration = Sequence.ReadUInt16();
State.perf_type = 3;
State.perf_decimal = ((double)(State.perf_value) / 0x7FFFd);
return(JaiEventType.PERF);
/* J2 Opcodes */
/* Unsure as of yet, but we have to keep alignment */
case 0xDD:
skip(3);
return(JaiEventType.UNKNOWN);
case 0xEF:
case 0xF9:
case 0xE6:
case 0xE7:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xA0:
case 0xA1:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xA3:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xA5:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xA7:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xA9:
skip(4);
return(JaiEventType.UNKNOWN);
case 0xAA:
skip(4);
return(JaiEventType.UNKNOWN);
case 0xAD:
skip(3);
return(JaiEventType.UNKNOWN);
case 0xAE:
return(JaiEventType.UNKNOWN);
case 0xB1:
case 0xB2:
case 0xB3:
case 0xB4:
case 0xB5:
case 0xB6:
case 0xB7:
int flag = Sequence.ReadByte();
if (flag == 0x40)
{
skip(2);
}
if (flag == 0x80)
{
skip(4);
}
return(JaiEventType.UNKNOWN);
case 0xDB:
case 0xDF:
skip(4);
return(JaiEventType.UNKNOWN);
case 0xCB:
case 0xBE:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xCC:
skip(2);
return(JaiEventType.UNKNOWN);
case 0xCF:
skip(1);
return(JaiEventType.UNKNOWN);
case 0xD0:
case 0xD1:
case 0xD2:
case 0xD5:
case 0xD9:
case 0xDE:
case 0xDA:
skip(1);
return(JaiEventType.UNKNOWN);
case 0xF1:
case 0xF4:
case 0xD6:
skip(1);
return(JaiEventType.UNKNOWN);
}
}
return(JaiEventType.UNKNOWN_ALIGN_FAIL);
}
