/
microphone.go
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/
microphone.go
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// Copyright 2022 Symbl.ai SDK contributors. All Rights Reserved.
// Use of this source code is governed by an Apache-2.0 license that can be found in the LICENSE file.
// SPDX-License-Identifier: Apache-2.0
package microphone
import (
"bytes"
"encoding/binary"
"io"
"github.com/gordonklaus/portaudio"
klog "k8s.io/klog/v2"
)
// Initialize inits the library
func Initialize() {
portaudio.Initialize()
}
// Teardown cleans up the library
func Teardown() {
portaudio.Terminate()
}
// New creates a new microphone using portaudio
func New(cfg AudioConfig) (*Microphone, error) {
klog.V(6).Infof("Microphone.New ENTER\n")
m := &Microphone{
stopChan: make(chan struct{}),
intBuf: make([]int16, 1024),
muted: false,
}
portaudio.Initialize()
stream, err := portaudio.OpenDefaultStream(cfg.InputChannels, 0, float64(cfg.SamplingRate), len(m.intBuf), m.intBuf)
if err != nil {
klog.V(1).Infof("OpenDefaultStream failed. Err: %v\n", err)
klog.V(6).Infof("Microphone.New LEAVE\n")
return nil, err
}
// housekeeping
m.stream = stream
klog.V(3).Infof("OpenDefaultStream succeded\n")
klog.V(6).Infof("Microphone.New LEAVE\n")
return m, nil
}
// Start begins the listening on the microphone
func (m *Microphone) Start() error {
err := m.stream.Start()
if err != nil {
klog.V(1).Infof("Mic failed to start. Err: %v\n", err)
return err
}
klog.V(3).Infof("Start() succeded\n")
return nil
}
// Read gets the raw bits generated by the mic
func (m *Microphone) Read() ([]int16, error) {
err := m.stream.Read()
if err != nil {
klog.V(1).Infof("stream.Read failed. Err: %v\n", err)
return nil, err
}
buf := make([]int16, 1024)
byteCopied := copy(buf, m.intBuf)
klog.V(7).Infof("stream.Read bytes copied: %d\n", byteCopied)
return buf, nil
}
// Stream is a helper function to stream the mic data to a source
func (m *Microphone) Stream(w io.Writer) error {
for {
select {
case <-m.stopChan:
return nil
default:
err := m.stream.Read()
if err != nil {
klog.V(1).Infof("stream.Read failed. Err: %v\n", err)
return err
}
byteCount, err := w.Write(m.int16ToLittleEndianByte(m.intBuf))
if err != nil {
klog.V(1).Infof("w.Write failed. Err: %v\n", err)
return err
}
klog.V(7).Infof("io.Writer succeeded. Bytes written: %d\n", byteCount)
}
}
return nil
}
// Mute silences the mic
func (m *Microphone) Mute() {
m.mute.Lock()
m.muted = true
m.mute.Unlock()
}
// Unmute restores recording on the mic
func (m *Microphone) Unmute() {
m.mute.Lock()
m.muted = false
m.mute.Unlock()
}
// Stop terminates listening on the mic
func (m *Microphone) Stop() error {
err := m.stream.Stop()
if err != nil {
klog.V(1).Infof("stream.Stop failed. Err: %v\n", err)
return err
}
close(m.stopChan)
<-m.stopChan
return nil
}
func (m *Microphone) int16ToLittleEndianByte(f []int16) []byte {
m.mute.Lock()
isMuted := m.muted
m.mute.Unlock()
if isMuted {
klog.V(7).Infof("Mic is MUTED!\n")
f = make([]int16, len(f))
}
var buf bytes.Buffer
err := binary.Write(&buf, binary.LittleEndian, f)
if err != nil {
klog.V(1).Infof("binary.Write failed. Err %v\n", err)
}
return buf.Bytes()
}