gomplerate

README

Gomplerate

A fast and simple pure Go audio resampling (sample rate conversion) library with zero dependencies.

Example

Resample audio with 2 channels from 11kHz to 44.1kHz

package main

import (
	"fmt"

	"github.com/zeozeozeo/gomplerate"
)

func main() {
	// create a new resampler, the first number is the amount of channels, the second
	// number is the original audio sample rate, the second audio is the target sample rate
	r, err := gomplerate.NewResampler(2, 11000, 44100)
	if err != nil {
		panic(err)
	}

	// you should have at least 16 samples (per channel) to actually resample anything
	// instead of this, you can load any kind of audio, remember to use ResampleFloat64
	// for float64 audio and ResampleInt16 for int16 audio (ResampleInt16 will convert
	// the audio to float64, resample it and convert back to int16)
	data := []float64{
		// each second value is repeated here, because that's the second audio channel
		0, 0, .5, .5, 1, 1, .9, .9, .8, .8, .7, .7, .6, .6, .5, .5,
		.4, .4, .3, .3, .2, .2, .25, .25, .3, .3, .35, .35, .4, .4,
		.45, .45, .5, .5, .55, .55, .6, .6, .65, .65, .7, .7, .75,
		.75, .8, .8, .85, .85, .9, .9, .95, .95, 1, 1, 1, 1, 1, 0, 0,
	}

	resampled := r.ResampleFloat64(data)
	fmt.Println(resampled) // will print out a lot of resampled floats
}

that's it...

Documentation

Index

• type Resampler
  • func NewResampler(channels, inputRate, outputRate int) (*Resampler, error)
  • func (resampler *Resampler) ResampleFloat64(data []float64) []float64
  • func (resampler *Resampler) ResampleInt16(data []int16) (resampledi16 []int16)

Types

type Resampler

type Resampler struct {
	FromRate int // The original audio sample rate.
	ToRate   int // The resampled audio sample rate.
	Channels int // The amount of channels.
}

func NewResampler

func NewResampler(channels, inputRate, outputRate int) (*Resampler, error)

func (*Resampler) ResampleFloat64

func (resampler *Resampler) ResampleFloat64(data []float64) []float64

Resamples a float64 audio buffer. Returns the resampled buffer.

func (*Resampler) ResampleInt16

func (resampler *Resampler) ResampleInt16(data []int16) (resampledi16 []int16)

Resamples an int16 audio buffer. Returns the resampled buffer.