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4.0 Migration guide

SpessaSynth 4.0 (The TypeScript Update) updates its libraries to ship with TypeScript definitions.

It also includes a few breaking changes which were made to make the API more consistent and logical.

This page documents all the breaking changes in spessasynth_core.

Note

Please report any innacurate or missing changes.

Breaking changes

All variables with soundfont in them have been renamed to use soundBank instead. This is done because spessasynth can load sound bank formats other than SoundFonts as well.

MIDI Patch System

SpessaSynth 4.0 brings the full bank LSB support in the API.

The system now operates on MIDI Patches - a way of selecting MIDI presets using 4 properties, compatible with GM, GS, XG and GM2. The existing MIDI files will continue to work as the preset selection system has been fine-tuned for various types of MIDI files.

The properties are explained below.

program

The MIDI program number, from 0 to 127.

bankLSB

Bank LSB controller, 0 to 127. This is mostly used in XG and GM2 for selecting variations of instruments, much like MSB in GS.

Note that the SF2 format does not support writing the bank LSB number so the wBank is still interpreted as both and flattened when writing.

bankMSB

This is what the previous bank used to be, but it’s now properly split up.

It is used for sound variation in GS, and for channel type in XG and GM2. This means that with bank MSB of 127 for example, a channel in XG mode will turn into a drum channel.

isGMGSDrum

This flag is exclusive to GM and GS systems. These don’t use bank MSB as a drum flag. GM has channel 9 hardcoded as drums, and GS has a system exclusive for setting them. This allows XG and GS drums to coexist in a single sound bank and can be thought of as bank 128 in SF2.

MIDI

MIDI (Class)

Removed, replaced by BasicMIDI.fromArrayBuffer(). Drop-in replacement.

MIDISequenceData

Removed, BasicMIDI now contains all data.

MIDIMessage

A few properties have been renamed for consistency. They behave in exactly the same way.

  • messageStatusByte -> statusByte
  • messageData -> data

BasicMIDI

A few methods and properties have been renamed for consistency. They behave in exactly the same way.

  • embeddedSoundFont -> embeddedSoundBank
  • MIDITicksToSeconds() -> midiTicksToSeconds()
  • modifyMIDI() -> modify()
  • midiPortChannelOffsets -> portChannelOffsetMap
  • applySnapshotToMIDI() -> applySnapshot()

RMIDInfo

Renamed to rmidiInfo.

Like soundBankInfo, the object’s property names are no longer the fourCCs, but human-readable names.

However, they still are stored as Uint8Arrays due to possibly unknown encodings.

Use getRMIDInfo or setRMIDInfo to get the decoded JS objects.

writeRMIDI

Now takes a partial options object instead of separate optional arguments.

Now returns ArrayBuffer instead of Uint8Array.

writeMIDI

Now returns ArrayBuffer instead of Uint8Array.

midiName

Removed.

It was only decoded via fromCharCode (due to the requirement of AudioWorkletGlobalScope which does not have the TextDecoder), so it often resulted in broken names.

getName() solves this issue and provides all the needed fallbacks (rawName, RMIDInfo and fileName). It’s a direct replacement.

Removed in favor of extraMetadata. There isn’t a consistent way to determine a copyright of a MIDI file as it’s often stored in track names or markers. Extra metadata separates what copyright was: a stitched string of all meta events that were “interesting”.

Like with midiName, getExtraMetadata() decodes the text.

tracks

Is no longer an array of MIDIMessage, but its own class: MIDITrack. The property events contains the events of the track.

trackNames

Removed, replaced with MIDITrack.name.

lyrics

Now contains MIDIMessage list instead of Uint8Array. Note that karaoke sanitization is no longer performed.

midiPorts

Removed, replaced with MIDITrack.port

usedChannelsOnTracks

Removed, replaced with MIDITrack.channels.

rawMidiName

Renamed to binaryName and will now be undefined if a name is not found. It is also protected. Use getName instead, which handles everything for you.

midiNameUsesFileName

Removed. You can compare getName() === fileName.

MIDIBuilder

Now takes an optional options object instead of separate option arguments. It also enforces correct MIDI formats 0 and 1.

Enums

messageTypes

Enum renamed to midiMessageTypes.

RMIDINFOChunks

Enum removed due to the rmidInfo object being reworked.

interpolationTypes

  • fourthOrder -> hermite

synthDisplayTypes

Removed. The synthdisplay now provides the entire message data.

BasicSoundBank

A few methods and properties have been renamed for consistency. They behave in exactly the same way.

  • getDummySoundfontFile() -> getSampleSoundBankFile()
  • write() -> writeSF2()

soundBankInfo

Renamed from soundFontInfo to soundBankInfo.

Overhaul: now mandatory fields are always required and naming has been changed from the confusing FourCCs to human-readable names such as name or engineer.

ifil and iver are no longer strings. They are objects version and romVersion respectively. The objects contain major and minor version numbers instead of a stitched together <major>.<minor> string.

Creation date is now a Date.

loadSoundFont

Removed, replaced by SoundBankLoader.fromArrayBuffer(). Drop-in replacement.

Modulator

modulatorDestination has been renamed to destination.

All properties regarding source have been replaced with a class ModulatorSource, which can automatically turn itself into an SF2 enum or transform values.

The static method copy has been made local. So Modulator.copy(mod) turns into mod.copy()

BasicSample

A few properties have been renamed for consistency. They behave in exactly the same way.

  • sampleName -> name
  • samplePitch -> originalKey
  • samplePitchCorrection -> samplePitchCorrection
  • sampleLoopStartIndex -> loopStart
  • sampleLoopEndIndex -> loopEnd

sampleData property is now protected. It was never meant to be accessed directly, getAudioData should be used instead.

setAudioData now requires two parameters instead of one: sample data and sample rate.

CreatedSample

CreatedSample has been removed and replaced in favor of EmptySample. The constructor takes no arguments.

BasicInstrument

A few methods and properties have been renamed for consistency. They behave in exactly the same way.

  • instrumentZones -> zones
  • instrumentName -> name
  • deleteInstrument() -> delete()

BasicInstrumentZone

  • setSample -> sample (setter)

Instrument zones now require a sample. This means that createZone() now requires one argument: the sample that belongs to that zone.

BasicPreset

bank

replaced with the MIDI patch system. For BasicPreset this means splitting up into three properties:

  • bankLSB
  • bankMSB
  • isGMGSDrum

A few methods and properties have been renamed for consistency. They behave in exactly the same way.

  • presetZones -> zones
  • presetName -> name
  • deletePreset() -> delete()

Preset zones now require an instrument. This means that createZone() now requires one argument: the instrument that belongs to that zone.

SpessaSynthProcessor

A few methods and properties have been renamed for consistency.

  • soundfontManager -> soundBankManager
  • midiAudioChannels -> midiChannels
  • createMidiChannel() -> createMIDIChannel()

The option effectsEnabled has been renamed to enableEffects.

pitchWheel

Now takes a single pitch 14-bit value instead of the confusing MSB and LSB parameters. Same with the pitchWheel event.

Events

onMasterParameterChange has been replaced with an event masterParameterChange. onChannelPropertyChange has been replaced with an event channelPropertyChange.

onEventCall now takes a single object as an argument. This is done to help with TypeScript type narrowing in switch statements.

The event names have been capitalized with camelCase. So, for example noteon becomes noteOn.

allControllerReset event no longer calls CC changes to default values. This was never intended as they are redundant when this controller exists. The default reset values can be accessed via the defaultMIDIControllerValues export. Locked controllers still get restored.

stopAll now specifies a channel number.

Master parameters

The master parameter system has been overhauled to use strings instead of enums.

processor.setMasterParameter(masterParameterType.masterPan, 1);
changes into: 
processor.setMasterParameter("masterPan", 1);

setSystem has been replaced with a master parameter.

A few properties have been replaced with master parameters.

  • deviceID
  • interpolationType
  • highPerformanceMode - note: renamed to blackMIDIMode
  • transposition
  • mainVolume - note: renamed to masterGain
  • reverbGain
  • chorusGain
  • voiceCap
  • pan
  • system
  • _monophonicRetriggerMode

Sound Bank Manager

A few methods and properties have been renamed for consistency. They behave in exactly the same way.

  • soundfontList -> soundBankList
  • deleteSoundFont -> deleteSoundBank
  • addNewSoundFont -> addSoundBank
  • destroyManager -> destroy
  • getCurrentSoundFontOrder -> priorityOrder (getter)
  • rearrangeSoundFonts -> priorityOrder (setter)
  • getPresetList -> presetList (getter)

presetList

presetName -> name

reloadManager

Removed. addSoundBank can be used to replace an existing one. reloadManager could cause issues with embedded sound banks.

channel configuration

Removed. It only had one property (velocity override) which can be implemented via key modifiers.

Synthesizer Snapshot

The following properties have been replaced by a property masterParameters:

  • mainVolume
  • pan
  • interpolation
  • system
  • transposition

static applySnapshot()

Removed, replaced by non-static apply(). Drop-in replacement.

static createSynthesizerSnapshot()

Removed, replaced by static create() Drop-in replacement.

SpessaSynthSequencer

The behavior has been overhauled:

The preservePlaybackState has been removed and is always on. Loading a new song list no longer automatically starts the playback.

loop

Removed, loopCount of zero disables the loop.

previousSong, nextSong

Removed, replaced with setting the songIndex property.

onEvent…

All onSomething have been replaced with onEventCall to bring the API in-line with SpessaSynthProcessor.

Note that this method also only takes a single object to help with TypeScript type narrowing.

SpessaSynthLogging

The parameter table has been removed as the console.table command is not used.

AudioToWav

Now takes an options object instead of separate optional parameters.