Writing Wave files

SpessaSynth has a helper function for writing wave files.

audioToWav

Converts PCM audio data into a fully valid wave file.

const file = audioToWav(audioData, sampleRate, normalizeAudio = true, metadata = {}, loop = undefined);

• audioData - an Array of Float32Arrays representing the data. For stereo, pass [leftData, rightData].
• sampleRate - number the sample rate, in Hertz.
• normalizeAudio - optional boolean - if true, the gain of the entire song will be adjusted, so the max sample is always 32,767 or min is always -32,768 (whichever is greater). Recommended.
• metadata - optional Object described below. All options are string and are optional:
  • title - the song's title
  • artist - the song's artist
  • album - the song's album
  • genre - the song's genre
• loop - optional Object that will write loop points to the file (using the cue chunk)
  • start - start time in seconds
  • end - end time in seconds

The metadata uses the INFO chunk to write the information. It is encoded with utf-8

Example code

Refer to examples/midi_to_wav_node for an example of rendering audio data to a wav file.