wav

README

wav

A simple Go library for reading PCM WAV audio files.

Usage

import "github.com/djfritz/wav"

w, err := wav.LoadFromFile("audio.wav")
if err != nil {
    // handle error
}

fmt.Println(w.Channels)      // number of channels
fmt.Println(w.Frequency)     // sample rate (e.g., 44100)
fmt.Println(w.BitsPerSample) // e.g., 16
fmt.Println(w.Length())      // duration

Loading from bytes

w, err := wav.Load(data)

Data

The PCM data is arranged as N many channels in the wav.Data field. Each channel has the same number of samples, and is stored as an int regardless of the bits per sample. You will have to scale the data using the BitsPerSample field.

License

BSD 2-Clause

Documentation

Index

• Variables
• type WAV
  • func Load(b []byte) (*WAV, error)
  • func LoadFromFile(filename string) (*WAV, error)
  • func (w *WAV) FloatData() [][]float64
  • func (w *WAV) Length() time.Duration
  • func (w *WAV) NumSamples() int

Variables

var (
	ErrShort                 = errors.New("short buffer")
	ErrRIFF                  = errors.New("invalid RIFF header")
	ErrNotWav                = errors.New("not a wav file")
	ErrMissingFmt            = errors.New("missing format block")
	ErrInvalidFmtSize        = errors.New("invalid format size")
	ErrAudioFmt              = errors.New("invalid audio format, only PCM integer supported")
	ErrUnsupportedSampleSize = errors.New("unsupported sample size")
)

Types

type WAV

type WAV struct {
	Size           int
	Channels       int
	Frequency      int
	BytesPerSecond int
	BytesPerBlock  int
	BitsPerSample  int
	Data           [][]int32
}

func Load

func Load(b []byte) (*WAV, error)

func LoadFromFile

func LoadFromFile(filename string) (*WAV, error)

func (*WAV) FloatData

func (w *WAV) FloatData() [][]float64

func (*WAV) Length

func (w *WAV) Length() time.Duration

func (*WAV) NumSamples

func (w *WAV) NumSamples() int