wav

README

go-wav

A Go library to read/write WAVE(RIFF waveform Audio) Format

Usage

package main

import (
	"flag"
	"fmt"
	"github.com/youpy/go-wav"
	"io"
	"os"
)

func main() {
	infile_path := flag.String("infile", "", "wav file to read")
	flag.Parse()

	file, _ := os.Open(*infile_path)
	reader := wav.NewReader(file)

  	defer file.Close()

	for {
		samples, err := reader.ReadSamples()
		if err == io.EOF {
			break
		}

		for _, sample := range samples {
			fmt.Printf("L/R: %d/%d\n", reader.IntValue(sample, 0), reader.IntValue(sample, 1))
		}
	}
}

Supported format

Format

• PCM
• IEEE float (read-only)
• G.711 A-law (read-only)
• G.711 µ-law (read-only)

Number of channels

• 1(mono)
• 2(stereo)

Bits per sample

• 32-bit
• 24-bit
• 16-bit
• 8-bit

Documentation

• https://godoc.org/github.com/youpy/go-wav

See Also

• http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html

Documentation

Index

• Constants
• type Reader
  • func NewReader(r riff.RIFFReader) *Reader
  • func (r *Reader) Duration() (time.Duration, error)
  • func (r *Reader) FloatValue(sample Sample, channel uint) float64
  • func (r *Reader) Format() (format *WavFormat, err error)
  • func (r *Reader) Info() (*WavInfo, error)
  • func (r *Reader) IntValue(sample Sample, channel uint) int
  • func (r *Reader) Read(p []byte) (n int, err error)
  • func (r *Reader) ReadSamples(params ...uint32) (samples []Sample, err error)
• type Sample
• type WavData
• type WavFormat
• type WavInfo
• type Writer
  • func NewWriter(w io.Writer, numSamples uint32, numChannels uint16, sampleRate uint32, ...) (writer *Writer)
  • func (w *Writer) WriteSamples(samples []Sample) (err error)

Constants

const (
	AudioFormatPCM       = 1
	AudioFormatIEEEFloat = 3
	AudioFormatALaw      = 6
	AudioFormatMULaw     = 7
)

Types

type Reader

type Reader struct {
	*WavData
	// contains filtered or unexported fields
}

func NewReader

func NewReader(r riff.RIFFReader) *Reader

func (*Reader) Duration

func (r *Reader) Duration() (time.Duration, error)

func (*Reader) FloatValue

func (r *Reader) FloatValue(sample Sample, channel uint) float64

func (*Reader) Format

func (r *Reader) Format() (format *WavFormat, err error)

func (*Reader) Info

func (r *Reader) Info() (*WavInfo, error)

func (*Reader) IntValue

func (r *Reader) IntValue(sample Sample, channel uint) int

func (*Reader) Read

func (r *Reader) Read(p []byte) (n int, err error)

func (*Reader) ReadSamples

func (r *Reader) ReadSamples(params ...uint32) (samples []Sample, err error)

type Sample

type Sample struct {
	Values [2]int
}

type WavData

type WavData struct {
	io.Reader
	Size uint32
	// contains filtered or unexported fields
}

type WavFormat

type WavFormat struct {
	AudioFormat   uint16
	NumChannels   uint16
	SampleRate    uint32
	ByteRate      uint32
	BlockAlign    uint16
	BitsPerSample uint16
}

type WavInfo

type WavInfo struct {
	NFrames     int
	SampleWidth int
	FrameRate   int
	NChannels   int
	FrameSize   int
}

type Writer

type Writer struct {
	io.Writer
	Format *WavFormat
}

func NewWriter

func NewWriter(w io.Writer, numSamples uint32, numChannels uint16, sampleRate uint32, bitsPerSample uint16) (writer *Writer)

func (*Writer) WriteSamples

func (w *Writer) WriteSamples(samples []Sample) (err error)