QOA

The Quite OK Audio Format for Fast, Lossy Compression.

The qoa package is a pure Go implementation.

Decode a .qoa file:

data, _ := os.ReadFile("groovy-tunes.qoa")
qoaMetadata, decodedData, err = qoa.Decode(inputData)
// Do stuff with decodedData

Or encode audio samples. This example shows a WAV file:

// Read a WAV
data, _ := os.ReadFile("groovy-tunes.wav")
wavReader := bytes.NewReader(data)
wavDecoder := wav.NewDecoder(wavReader)
wavBuffer, err := wavDecoder.FullPCMBuffer()

// Figure out audio metadata and create a new QOA encoder using the info
numSamples := uint32(len(wavBuffer.Data) / wavBuffer.Format.NumChannels)
qoaFormat := qoa.NewEncoder(
  uint32(wavBuffer.Format.SampleRate),
  uint32(wavBuffer.Format.NumChannels),
  numSamples)
// Convert the audio data to int16 (QOA format)
decodedData = make([]int16, len(wavBuffer.Data))
for i, val := range wavBuffer.Data {
  decodedData[i] = int16(val)
}

// Finally, encode the audio data
qoaEncodedData, err := qoa.Encode(decodedData)

Commit History

Most of this package was developed in goqoa and the commit history can be found there.

I moved it out of that project because I didn't want the version of the library to be dependent on the version of the higher level goqoa tool and I didn't know (at the time) that Go has an opinionated way of handling module versions.