It's basically a simplified MIDI file (lacks support for SMPTE and most meta/system messages) encoded in a smarter way. This implementation can decode anything in the 550 cache, convert it to MIDI format and then re-encode it bit-for-bit identically to the original. Signed-off-by: Graham <gpe@openrs2.org>bzip2
parent
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package org.openrs2.cache.midi |
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|
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import io.netty.buffer.ByteBuf |
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import io.netty.buffer.ByteBufAllocator |
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import org.openrs2.buffer.readVarInt |
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import org.openrs2.buffer.writeVarInt |
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import javax.sound.midi.MetaMessage |
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import javax.sound.midi.MidiEvent |
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import javax.sound.midi.Sequence |
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import javax.sound.midi.ShortMessage |
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public object Song { |
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private const val NOTE_ON = 0 |
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private const val NOTE_OFF = 1 |
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private const val CONTROL_CHANGE = 2 |
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private const val PITCH_WHEEL_CHANGE = 3 |
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private const val CHANNEL_PRESSURE_CHANGE = 4 |
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private const val KEY_PRESSURE_CHANGE = 5 |
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private const val PROGRAM_CHANGE = 6 |
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private const val END_OF_TRACK = 7 |
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private const val SET_TEMPO = 23 |
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private const val BANK_SELECT_MSB = 0 |
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private const val BANK_SELECT_LSB = 32 |
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private const val MODULATION_WHEEL_MSB = 1 |
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private const val MODULATION_WHEEL_LSB = 33 |
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private const val CHANNEL_VOLUME_MSB = 7 |
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private const val CHANNEL_VOLUME_LSB = 39 |
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private const val PAN_MSB = 10 |
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private const val PAN_LSB = 42 |
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private const val NON_REGISTERED_MSB = 99 |
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private const val NON_REGISTERED_LSB = 98 |
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private const val REGISTERED_MSB = 101 |
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private const val REGISTERED_LSB = 100 |
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private const val DAMPER = 64 |
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private const val PORTAMENTO = 65 |
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private const val ALL_SOUND_OFF = 120 |
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private const val RESET_CONTROLLERS = 121 |
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private const val ALL_NOTES_OFF = 123 |
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private const val META_END_OF_TRACK = 47 |
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private const val META_SET_TEMPO = 81 |
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private const val CONTROLLERS = 128 |
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public fun read(buf: ByteBuf): Sequence { |
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buf.markReaderIndex() |
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val tracks = buf.getUnsignedByte(buf.writerIndex() - 3).toInt() |
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val division = buf.getUnsignedShort(buf.writerIndex() - 2) |
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if (division and 0x8000 != 0) { |
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throw IllegalArgumentException("SMPTE unsupported") |
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} |
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val sequence = Sequence(Sequence.PPQ, division and 0x7FFF) |
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var events = 0 |
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var tempoChanges = 0 |
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var noteOnEvents = 0 |
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var noteOffEvents = 0 |
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var controllerEvents = 0 |
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var pitchWheelEvents = 0 |
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var channelPressureEvents = 0 |
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var keyPressureEvents = 0 |
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var bankSelectEvents = 0 |
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for (i in 0 until tracks) { |
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while (true) { |
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events++ |
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val statusAndChannel = buf.readUnsignedByte().toInt() |
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if (statusAndChannel == END_OF_TRACK) { |
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break |
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} else if (statusAndChannel == SET_TEMPO) { |
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tempoChanges++ |
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continue |
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} |
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|
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when (val status = statusAndChannel and 0xF) { |
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NOTE_ON -> noteOnEvents++ |
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NOTE_OFF -> noteOffEvents++ |
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CONTROL_CHANGE -> controllerEvents++ |
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PITCH_WHEEL_CHANGE -> pitchWheelEvents++ |
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CHANNEL_PRESSURE_CHANGE -> channelPressureEvents++ |
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KEY_PRESSURE_CHANGE -> keyPressureEvents++ |
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PROGRAM_CHANGE -> bankSelectEvents++ |
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else -> throw IllegalArgumentException("Unsupported status: $status") |
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} |
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} |
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} |
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val deltaTimeBuf = buf.slice() |
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for (i in 0 until events) { |
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buf.readVarInt() |
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} |
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var modulationWheelMsbEvents = 0 |
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var modulationWheelLsbEvents = 0 |
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var channelVolumeMsbEvents = 0 |
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var channelVolumeLsbEvents = 0 |
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var panMsbEvents = 0 |
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var panLsbEvents = 0 |
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var nonRegisteredMsbEvents = 0 |
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var nonRegisteredLsbEvents = 0 |
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var registeredMsbEvents = 0 |
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var registeredLsbEvents = 0 |
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var otherKnownControllerEvents = 0 |
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var unknownControllerEvents = 0 |
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val controllerBuf = buf.slice() |
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var controller = 0 |
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for (i in 0 until controllerEvents) { |
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controller = (controller + buf.readUnsignedByte()) and 0x7F |
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when (controller) { |
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BANK_SELECT_MSB, BANK_SELECT_LSB -> bankSelectEvents++ |
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MODULATION_WHEEL_MSB -> modulationWheelMsbEvents++ |
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MODULATION_WHEEL_LSB -> modulationWheelLsbEvents++ |
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CHANNEL_VOLUME_MSB -> channelVolumeMsbEvents++ |
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CHANNEL_VOLUME_LSB -> channelVolumeLsbEvents++ |
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PAN_MSB -> panMsbEvents++ |
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PAN_LSB -> panLsbEvents++ |
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NON_REGISTERED_MSB -> nonRegisteredMsbEvents++ |
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NON_REGISTERED_LSB -> nonRegisteredLsbEvents++ |
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REGISTERED_MSB -> registeredMsbEvents++ |
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REGISTERED_LSB -> registeredLsbEvents++ |
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DAMPER, PORTAMENTO, ALL_SOUND_OFF, RESET_CONTROLLERS, ALL_NOTES_OFF -> otherKnownControllerEvents++ |
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else -> unknownControllerEvents++ |
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} |
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} |
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val otherKnownControllerBuf = buf.readSlice(otherKnownControllerEvents) |
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val keyPressureBuf = buf.readSlice(keyPressureEvents) |
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val channelPressureBuf = buf.readSlice(channelPressureEvents) |
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val pitchWheelMsbBuf = buf.readSlice(pitchWheelEvents) |
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val modulationWheelMsbBuf = buf.readSlice(modulationWheelMsbEvents) |
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val channelVolumeMsbBuf = buf.readSlice(channelVolumeMsbEvents) |
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val panMsbBuf = buf.readSlice(panMsbEvents) |
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val keyBuf = buf.readSlice(noteOnEvents + noteOffEvents + keyPressureEvents) |
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val onVelocityBuf = buf.readSlice(noteOnEvents) |
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val unknownControllerBuf = buf.readSlice(unknownControllerEvents) |
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val offVelocityBuf = buf.readSlice(noteOffEvents) |
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val modulationWheelLsbBuf = buf.readSlice(modulationWheelLsbEvents) |
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val channelVolumeLsbBuf = buf.readSlice(channelVolumeLsbEvents) |
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val panLsbBuf = buf.readSlice(panLsbEvents) |
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val bankSelectBuf = buf.readSlice(bankSelectEvents) |
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val pitchWheelLsbBuf = buf.readSlice(pitchWheelEvents) |
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val nonRegisteredMsbBuf = buf.readSlice(nonRegisteredMsbEvents) |
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val nonRegisteredLsbBuf = buf.readSlice(nonRegisteredLsbEvents) |
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val registeredMsbBuf = buf.readSlice(registeredMsbEvents) |
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val registeredLsbBuf = buf.readSlice(registeredLsbEvents) |
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val tempoBuf = buf.readSlice(tempoChanges * 3) |
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// check only the three trailer bytes are remaining |
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assert(buf.readableBytes() == 3) |
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buf.resetReaderIndex() |
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var channel = 0 |
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var key = 0 |
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var onVelocity = 0 |
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var offVelocity = 0 |
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controller = 0 |
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val values = IntArray(CONTROLLERS) |
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var pitchWheel = 0 |
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var channelPressure = 0 |
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var keyPressure = 0 |
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for (i in 0 until tracks) { |
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val track = sequence.createTrack() |
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var time = 0L |
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while (true) { |
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time += deltaTimeBuf.readVarInt() |
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val statusAndChannel = buf.readUnsignedByte().toInt() |
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if (statusAndChannel == END_OF_TRACK) { |
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track.add(MidiEvent(MetaMessage(META_END_OF_TRACK, null, 0), time)) |
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break |
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} else if (statusAndChannel == SET_TEMPO) { |
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val tempo = ByteArray(3) |
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tempoBuf.readBytes(tempo) |
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track.add(MidiEvent(MetaMessage(META_SET_TEMPO, tempo, tempo.size), time)) |
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continue |
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} |
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val status = statusAndChannel and 0xF |
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channel = channel xor (statusAndChannel shr 4) |
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val message = when (status) { |
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NOTE_ON -> { |
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key = (key + keyBuf.readUnsignedByte().toInt()) and 0x7F |
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onVelocity = (onVelocity + onVelocityBuf.readUnsignedByte().toInt()) and 0x7F |
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ShortMessage(ShortMessage.NOTE_ON, channel, key, onVelocity) |
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} |
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NOTE_OFF -> { |
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key = (key + keyBuf.readUnsignedByte().toInt()) and 0x7F |
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offVelocity = (offVelocity + offVelocityBuf.readUnsignedByte().toInt()) and 0x7F |
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ShortMessage(ShortMessage.NOTE_OFF, channel, key, offVelocity) |
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} |
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CONTROL_CHANGE -> { |
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controller = (controller + controllerBuf.readUnsignedByte()) and 0x7F |
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val valueDelta = when (controller) { |
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BANK_SELECT_MSB, BANK_SELECT_LSB -> bankSelectBuf.readUnsignedByte().toInt() |
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MODULATION_WHEEL_MSB -> modulationWheelMsbBuf.readUnsignedByte().toInt() |
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MODULATION_WHEEL_LSB -> modulationWheelLsbBuf.readUnsignedByte().toInt() |
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CHANNEL_VOLUME_MSB -> channelVolumeMsbBuf.readUnsignedByte().toInt() |
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CHANNEL_VOLUME_LSB -> channelVolumeLsbBuf.readUnsignedByte().toInt() |
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PAN_MSB -> panMsbBuf.readUnsignedByte().toInt() |
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PAN_LSB -> panLsbBuf.readUnsignedByte().toInt() |
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NON_REGISTERED_MSB -> nonRegisteredMsbBuf.readUnsignedByte().toInt() |
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NON_REGISTERED_LSB -> nonRegisteredLsbBuf.readUnsignedByte().toInt() |
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REGISTERED_MSB -> registeredMsbBuf.readUnsignedByte().toInt() |
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REGISTERED_LSB -> registeredLsbBuf.readUnsignedByte().toInt() |
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DAMPER, PORTAMENTO, ALL_SOUND_OFF, RESET_CONTROLLERS, ALL_NOTES_OFF -> |
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otherKnownControllerBuf.readUnsignedByte().toInt() |
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else -> unknownControllerBuf.readUnsignedByte().toInt() |
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} |
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val value = values[controller] + valueDelta |
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values[controller] = value |
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ShortMessage(ShortMessage.CONTROL_CHANGE, channel, controller, value and 0x7F) |
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} |
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PITCH_WHEEL_CHANGE -> { |
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pitchWheel += pitchWheelLsbBuf.readUnsignedByte().toInt() |
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pitchWheel += (pitchWheelMsbBuf.readUnsignedByte().toInt() shl 7) |
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pitchWheel = pitchWheel and 0x3FFF |
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ShortMessage(ShortMessage.PITCH_BEND, channel, pitchWheel and 0x7F, pitchWheel shr 7) |
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} |
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CHANNEL_PRESSURE_CHANGE -> { |
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channelPressure = (channelPressure + channelPressureBuf.readUnsignedByte().toInt()) and 0x7F |
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ShortMessage(ShortMessage.CHANNEL_PRESSURE, channel, channelPressure, 0) |
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} |
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KEY_PRESSURE_CHANGE -> { |
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key = (key + keyBuf.readUnsignedByte().toInt()) and 0x7F |
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keyPressure = (keyPressure + keyPressureBuf.readUnsignedByte().toInt()) and 0x7F |
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ShortMessage(ShortMessage.POLY_PRESSURE, channel, key, keyPressure) |
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} |
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PROGRAM_CHANGE -> { |
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val bankSelect = bankSelectBuf.readUnsignedByte().toInt() |
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ShortMessage(ShortMessage.PROGRAM_CHANGE, channel, bankSelect, 0) |
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} |
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else -> throw IllegalStateException() |
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} |
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track.add(MidiEvent(message, time)) |
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} |
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} |
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// we've consumed the entire buf (checked by an assertion above) |
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buf.readerIndex(buf.writerIndex()) |
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return sequence |
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} |
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public fun write(sequence: Sequence, buf: ByteBuf) { |
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if (sequence.divisionType != Sequence.PPQ) { |
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throw IllegalArgumentException("SMPTE unsupported") |
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} |
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val buffers = Buffers.alloc(buf.alloc()) |
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try { |
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val deltaTimeBuf = buffers.deltaTimeBuf |
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val controllerBuf = buffers.controllerBuf |
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val otherKnownControllerBuf = buffers.otherKnownControllerBuf |
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val keyPressureBuf = buffers.keyPressureBuf |
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val channelPressureBuf = buffers.channelPressureBuf |
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val pitchWheelMsbBuf = buffers.pitchWheelMsbBuf |
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val modulationWheelMsbBuf = buffers.modulationWheelMsbBuf |
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val channelVolumeMsbBuf = buffers.channelVolumeMsbBuf |
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val panMsbBuf = buffers.panMsbBuf |
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val keyBuf = buffers.keyBuf |
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val onVelocityBuf = buffers.onVelocityBuf |
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val unknownControllerBuf = buffers.unknownControllerBuf |
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val offVelocityBuf = buffers.offVelocityBuf |
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val modulationWheelLsbBuf = buffers.modulationWheelLsbBuf |
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val channelVolumeLsbBuf = buffers.channelVolumeLsbBuf |
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val panLsbBuf = buffers.panLsbBuf |
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val bankSelectBuf = buffers.bankSelectBuf |
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val pitchWheelLsbBuf = buffers.pitchWheelLsbBuf |
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val nonRegisteredMsbBuf = buffers.nonRegisteredMsbBuf |
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val nonRegisteredLsbBuf = buffers.nonRegisteredLsbBuf |
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val registeredMsbBuf = buffers.nonRegisteredMsbBuf |
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val registeredLsbBuf = buffers.nonRegisteredLsbBuf |
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val tempoBuf = buffers.tempoBuf |
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var prevChannel = 0 |
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var prevKey = 0 |
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var prevOnVelocity = 0 |
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var prevOffVelocity = 0 |
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var prevController = 0 |
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var prevPitchWheel = 0 |
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var prevChannelPressure = 0 |
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var prevKeyPressure = 0 |
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val prevValues = IntArray(CONTROLLERS) |
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for (track in sequence.tracks) { |
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var prevTime = 0L |
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for (i in 0 until track.size()) { |
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val event = track[i] |
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val time = event.tick |
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deltaTimeBuf.writeVarInt((time - prevTime).toInt()) |
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prevTime = time |
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when (val message = event.message) { |
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is MetaMessage -> { |
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when (val type = message.type) { |
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META_END_OF_TRACK -> buf.writeByte(END_OF_TRACK) |
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META_SET_TEMPO -> { |
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buf.writeByte(SET_TEMPO) |
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require(message.data.size == 3) |
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tempoBuf.writeBytes(message.data) |
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} |
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else -> throw IllegalArgumentException("Unsupported meta type: $type") |
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} |
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} |
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is ShortMessage -> { |
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val command = message.status and 0xF0 |
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val channel = message.status and 0xF |
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val status = when (command) { |
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ShortMessage.NOTE_ON -> NOTE_ON |
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ShortMessage.NOTE_OFF -> NOTE_OFF |
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ShortMessage.CONTROL_CHANGE -> CONTROL_CHANGE |
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ShortMessage.PITCH_BEND -> PITCH_WHEEL_CHANGE |
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ShortMessage.CHANNEL_PRESSURE -> CHANNEL_PRESSURE_CHANGE |
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ShortMessage.POLY_PRESSURE -> KEY_PRESSURE_CHANGE |
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ShortMessage.PROGRAM_CHANGE -> PROGRAM_CHANGE |
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else -> throw IllegalArgumentException("Unsupported command: $command") |
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} |
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buf.writeByte(((channel xor prevChannel) shl 4) or status) |
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prevChannel = channel |
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if ( |
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command == ShortMessage.NOTE_ON || |
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command == ShortMessage.NOTE_OFF || |
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command == ShortMessage.POLY_PRESSURE |
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) { |
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val key = message.data1 |
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keyBuf.writeByte((key - prevKey) and 0x7F) |
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prevKey = key |
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} |
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when (command) { |
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ShortMessage.NOTE_ON -> { |
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val onVelocity = message.data2 |
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onVelocityBuf.writeByte((onVelocity - prevOnVelocity) and 0x7F) |
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prevOnVelocity = onVelocity |
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} |
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ShortMessage.NOTE_OFF -> { |
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val offVelocity = message.data2 |
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offVelocityBuf.writeByte((offVelocity - prevOffVelocity) and 0x7F) |
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prevOffVelocity = offVelocity |
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} |
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ShortMessage.CONTROL_CHANGE -> { |
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val controller = message.data1 |
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controllerBuf.writeByte((controller - prevController) and 0x7F) |
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prevController = controller |
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val value = message.data2 |
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val valueDelta = (value - prevValues[controller]) and 0x7F |
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when (controller) { |
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BANK_SELECT_MSB, BANK_SELECT_LSB -> bankSelectBuf.writeByte(valueDelta) |
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MODULATION_WHEEL_MSB -> modulationWheelMsbBuf.writeByte(valueDelta) |
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MODULATION_WHEEL_LSB -> modulationWheelLsbBuf.writeByte(valueDelta) |
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CHANNEL_VOLUME_MSB -> channelVolumeMsbBuf.writeByte(valueDelta) |
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CHANNEL_VOLUME_LSB -> channelVolumeLsbBuf.writeByte(valueDelta) |
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PAN_MSB -> panMsbBuf.writeByte(valueDelta) |
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PAN_LSB -> panLsbBuf.writeByte(valueDelta) |
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NON_REGISTERED_MSB -> nonRegisteredMsbBuf.writeByte(valueDelta) |
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NON_REGISTERED_LSB -> nonRegisteredLsbBuf.writeByte(valueDelta) |
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REGISTERED_MSB -> registeredMsbBuf.writeByte(valueDelta) |
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REGISTERED_LSB -> registeredLsbBuf.writeByte(valueDelta) |
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DAMPER, PORTAMENTO, ALL_SOUND_OFF, RESET_CONTROLLERS, ALL_NOTES_OFF -> |
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otherKnownControllerBuf.writeByte(valueDelta) |
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else -> unknownControllerBuf.writeByte(valueDelta) |
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} |
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prevValues[controller] = value |
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} |
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ShortMessage.PITCH_BEND -> { |
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val pitchWheel = message.data1 or (message.data2 shl 7) |
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val pitchWheelDelta = (pitchWheel - prevPitchWheel) and 0x3FFF |
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pitchWheelLsbBuf.writeByte(pitchWheelDelta and 0x7F) |
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pitchWheelMsbBuf.writeByte(pitchWheelDelta shr 7) |
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prevPitchWheel = pitchWheel |
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} |
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ShortMessage.CHANNEL_PRESSURE -> { |
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val channelPressure = message.data1 |
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channelPressureBuf.writeByte((channelPressure - prevChannelPressure) and 0x7F) |
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prevChannelPressure = channelPressure |
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} |
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ShortMessage.POLY_PRESSURE -> { |
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val keyPressure = message.data2 |
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keyPressureBuf.writeByte((keyPressure - prevKeyPressure) and 0x7F) |
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prevKeyPressure = keyPressure |
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} |
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ShortMessage.PROGRAM_CHANGE -> { |
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bankSelectBuf.writeByte(message.data1) |
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} |
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else -> throw IllegalStateException() |
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} |
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} |
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else -> throw IllegalArgumentException("Unsupported message type: ${message.javaClass.name}") |
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} |
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} |
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} |
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buf.writeBytes(deltaTimeBuf) |
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buf.writeBytes(controllerBuf) |
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buf.writeBytes(otherKnownControllerBuf) |
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buf.writeBytes(keyPressureBuf) |
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buf.writeBytes(channelPressureBuf) |
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buf.writeBytes(pitchWheelMsbBuf) |
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buf.writeBytes(modulationWheelMsbBuf) |
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buf.writeBytes(channelVolumeMsbBuf) |
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buf.writeBytes(panMsbBuf) |
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buf.writeBytes(keyBuf) |
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buf.writeBytes(onVelocityBuf) |
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buf.writeBytes(unknownControllerBuf) |
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buf.writeBytes(offVelocityBuf) |
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buf.writeBytes(modulationWheelLsbBuf) |
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buf.writeBytes(channelVolumeLsbBuf) |
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buf.writeBytes(panLsbBuf) |
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buf.writeBytes(bankSelectBuf) |
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buf.writeBytes(pitchWheelLsbBuf) |
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buf.writeBytes(nonRegisteredMsbBuf) |
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buf.writeBytes(nonRegisteredLsbBuf) |
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buf.writeBytes(registeredMsbBuf) |
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buf.writeBytes(registeredLsbBuf) |
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buf.writeBytes(tempoBuf) |
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} finally { |
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buffers.release() |
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} |
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buf.writeByte(sequence.tracks.size) |
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buf.writeShort(sequence.resolution and 0x7FFF) |
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} |
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private class Buffers private constructor( |
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val deltaTimeBuf: ByteBuf, |
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val controllerBuf: ByteBuf, |
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val otherKnownControllerBuf: ByteBuf, |
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val keyPressureBuf: ByteBuf, |
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val channelPressureBuf: ByteBuf, |
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val pitchWheelMsbBuf: ByteBuf, |
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val modulationWheelMsbBuf: ByteBuf, |
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val channelVolumeMsbBuf: ByteBuf, |
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val panMsbBuf: ByteBuf, |
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val keyBuf: ByteBuf, |
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val onVelocityBuf: ByteBuf, |
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val unknownControllerBuf: ByteBuf, |
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val offVelocityBuf: ByteBuf, |
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val modulationWheelLsbBuf: ByteBuf, |
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val channelVolumeLsbBuf: ByteBuf, |
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val panLsbBuf: ByteBuf, |
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val bankSelectBuf: ByteBuf, |
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val pitchWheelLsbBuf: ByteBuf, |
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val nonRegisteredMsbBuf: ByteBuf, |
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val nonRegisteredLsbBuf: ByteBuf, |
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val registeredMsbBuf: ByteBuf, |
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val registeredLsbBuf: ByteBuf, |
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val tempoBuf: ByteBuf |
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) { |
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fun release() { |
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deltaTimeBuf.release() |
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controllerBuf.release() |
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otherKnownControllerBuf.release() |
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keyPressureBuf.release() |
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channelPressureBuf.release() |
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pitchWheelMsbBuf.release() |
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modulationWheelMsbBuf.release() |
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channelVolumeMsbBuf.release() |
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panMsbBuf.release() |
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keyBuf.release() |
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onVelocityBuf.release() |
||||
unknownControllerBuf.release() |
||||
offVelocityBuf.release() |
||||
modulationWheelLsbBuf.release() |
||||
channelVolumeLsbBuf.release() |
||||
panLsbBuf.release() |
||||
bankSelectBuf.release() |
||||
pitchWheelLsbBuf.release() |
||||
nonRegisteredMsbBuf.release() |
||||
nonRegisteredLsbBuf.release() |
||||
registeredMsbBuf.release() |
||||
registeredLsbBuf.release() |
||||
tempoBuf.release() |
||||
} |
||||
|
||||
companion object { |
||||
fun alloc(alloc: ByteBufAllocator): Buffers { |
||||
val bufs = mutableListOf<ByteBuf>() |
||||
try { |
||||
for (i in 0..22) { |
||||
bufs += alloc.buffer() |
||||
} |
||||
|
||||
return Buffers( |
||||
bufs[0].retain(), |
||||
bufs[1].retain(), |
||||
bufs[2].retain(), |
||||
bufs[3].retain(), |
||||
bufs[4].retain(), |
||||
bufs[5].retain(), |
||||
bufs[6].retain(), |
||||
bufs[7].retain(), |
||||
bufs[8].retain(), |
||||
bufs[9].retain(), |
||||
bufs[10].retain(), |
||||
bufs[11].retain(), |
||||
bufs[12].retain(), |
||||
bufs[13].retain(), |
||||
bufs[14].retain(), |
||||
bufs[15].retain(), |
||||
bufs[16].retain(), |
||||
bufs[17].retain(), |
||||
bufs[18].retain(), |
||||
bufs[19].retain(), |
||||
bufs[20].retain(), |
||||
bufs[21].retain(), |
||||
bufs[22].retain() |
||||
) |
||||
} finally { |
||||
bufs.forEach(ByteBuf::release) |
||||
} |
||||
} |
||||
} |
||||
} |
||||
} |
||||
Loading…
Reference in new issue