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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, options);
  • audioData - an Array of Float32Arrays representing the data. For stereo, pass [leftData, rightData].
  • sampleRate - number the sample rate, in Hertz.
  • options - an optional Object, described below:
  • 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.ts for an example of rendering audio data to a wav file.