143 lines
3.3 KiB
Go
143 lines
3.3 KiB
Go
package goborator
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/*
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#cgo pkg-config: cgaborator
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#include <cgaborator.h>
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void cgoCallback(uintptr_t callback_data, float* data, int size);
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typedef void (*gaborator_transform_callback)(uintptr_t callback_data, float* data, int size);
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*/
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import "C"
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import (
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"fmt"
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"log"
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"runtime/cgo"
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"unsafe"
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)
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type Gaborator struct {
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pointer C.uintptr_t
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audioBlockSize int
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coefficientOutputChannel chan []float32
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bandsPerOctave int
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bandNumberCache int
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latency int64
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}
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func NewGaborator(blockSize int, sampleRate float64, bandsPerOctave int, minimumFrequency, maximumFrequency, referenceFrequency float64, stepSize int) *Gaborator {
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ob := &Gaborator{
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pointer: C.gaborator_initialize(C.int(blockSize), C.double(sampleRate), C.int(bandsPerOctave), C.double(minimumFrequency), C.double(referenceFrequency), C.double(maximumFrequency), C.int(stepSize)),
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audioBlockSize: blockSize,
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bandsPerOctave: bandsPerOctave,
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}
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ob.bandNumberCache = ob.GetNumberOfBands()
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ob.latency = int64(C.gaborator_analysis_support(ob.pointer))
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return ob
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}
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func (g *Gaborator) GetNumberOfBands() int {
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return int(C.gaborator_number_of_bands(g.pointer))
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}
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func (g *Gaborator) gaborTransform(audioData []float32) {
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g.analyze(audioData)
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}
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func (g *Gaborator) GetChannel() chan []float32 {
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if g.coefficientOutputChannel == nil {
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g.coefficientOutputChannel = make(chan []float32, 1024)
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}
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return g.coefficientOutputChannel
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}
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func (g *Gaborator) GaborBlockTransform(source chan []float32) (channel chan []float32) {
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channel = g.GetChannel()
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go func() {
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defer g.ProcessingFinished()
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for {
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block, more := <-source
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if !more {
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break
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}
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err := g.Process(block)
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if err != nil {
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log.Panic(err)
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}
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}
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}()
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return channel
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}
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func (g *Gaborator) GaborTransform(source chan float32) (channel chan []float32) {
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channel = g.GetChannel()
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go func() {
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defer g.ProcessingFinished()
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audioData := make([]float32, 0, g.audioBlockSize)
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for {
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f, more := <-source
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if !more {
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break
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}
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audioData = append(audioData, f)
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for len(audioData) >= g.audioBlockSize {
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g.gaborTransform(audioData[0:g.audioBlockSize])
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audioData = audioData[:0]
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}
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}
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}()
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return channel
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}
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func (g *Gaborator) Process(block []float32) error {
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if len(block) != g.audioBlockSize {
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return fmt.Errorf("invalid block size %d != %d", len(block), g.audioBlockSize)
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}
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g.gaborTransform(block)
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return nil
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}
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func (g *Gaborator) ProcessingFinished() {
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if g.pointer != 0 {
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C.gaborator_release(g.pointer)
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g.pointer = 0
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}
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if g.coefficientOutputChannel != nil {
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close(g.coefficientOutputChannel)
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g.coefficientOutputChannel = nil
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}
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}
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func (g *Gaborator) GetBlockSize() int {
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return g.audioBlockSize
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}
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func (g *Gaborator) GetLatency() int64 {
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return g.latency
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}
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func (g *Gaborator) GetBandwidth() float64 {
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return 1200. / float64(g.bandsPerOctave)
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}
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func (g *Gaborator) analyze(block []float32) {
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handle := cgo.NewHandle(g.coefficientOutputChannel)
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defer handle.Delete()
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C.gaborator_transform(g.pointer, (*C.float)(&block[0]), C.int(len(block)), C.gaborator_transform_callback(C.cgoCallback), C.uintptr_t(handle))
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}
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//export cgoCallback
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func cgoCallback(ptr C.uintptr_t, data *C.float, size C.int) {
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buf := make([]float32, size)
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copy(buf, unsafe.Slice((*float32)(data), int(size)))
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cgo.Handle(ptr).Value().(chan []float32) <- buf
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}
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