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|
package main
import (
"bufio"
"fmt"
"log"
"net"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/gordonklaus/portaudio"
)
type AudioRelay struct {
// TCP
listener net.Listener // TCP监听器，用于接受客户端连接
clients map[net.Conn]bool // 已连接的客户端
clientsMu sync.RWMutex // 客户端集合的读写锁
// 音频流
stream *portaudio.Stream // PortAudio捕获音频实例
sampleRate float64 // 采样率
channels int // 声道数
bufferSize int // 缓冲区大小
isRunning bool // 运行状态标
devices []*portaudio.DeviceInfo // 可用输入设备列表
// 音频捕获控制
captureStarted bool // 捕获状态
captureMutex sync.RWMutex // 捕获状态的读写锁
selectedDevice *portaudio.DeviceInfo // 选择音频输入设备
}
func NewAudioRelay() *AudioRelay {
if err := portaudio.Initialize(); err != nil {
log.Printf("Error: PortAudio initialization failed: %v", err)
}
return &AudioRelay{
clients: make(map[net.Conn]bool),
sampleRate: 48000,
channels: 2,
bufferSize: 1024,
isRunning: false,
captureStarted: false,
}
}
// 获取输入设备
func (n *AudioRelay) GetInputDevices() ([]*portaudio.DeviceInfo, error) {
allDevices, err := portaudio.Devices()
if err != nil {
return nil, fmt.Errorf("failed to get input device list: %v", err)
}
var inputDevices []*portaudio.DeviceInfo
for _, device := range allDevices {
if device.MaxInputChannels > 0 {
inputDevices = append(inputDevices, device)
}
}
n.devices = inputDevices
return inputDevices, nil
}
// 选择设备
func (n *AudioRelay) SelectInputDevice() (*portaudio.DeviceInfo, error) {
devices, err := n.GetInputDevices()
if err != nil {
return nil, err
}
if len(devices) == 0 {
return nil, fmt.Errorf(" No available input devices found")
}
fmt.Println("\n🎧 Currently available audio devices:")
fmt.Println("\n ")
for i, device := range devices {
defaultMarker := ""
defaultDevice, err := portaudio.DefaultInputDevice()
if err == nil && device.Name == defaultDevice.Name {
defaultMarker = " (default)"
}
fmt.Printf("[%d] %s%s\n", i, device.Name, defaultMarker)
fmt.Printf(" Input Channels: %d, Sample Rate: %.0f Hz API: %s\n",
device.MaxInputChannels, device.DefaultSampleRate,
device.HostApi.Name)
fmt.Println()
}
reader := bufio.NewReader(os.Stdin)
for {
fmt.Print("Input Device number (q to quit): ")
input, _ := reader.ReadString('\n')
input = strings.TrimSpace(input)
if strings.ToLower(input) == "q" {
return nil, fmt.Errorf("operation cancelled by user")
}
index, err := strconv.Atoi(input)
if err != nil || index < 0 || index >= len(devices) {
fmt.Printf("X Invalid choice, enter 0-%d\n", len(devices)-1)
continue
}
selectedDevice := devices[index]
fmt.Printf("\n √ Selected: %s\n", selectedDevice.Name)
// 显示设备详细信息
n.DisplayDeviceInfo(selectedDevice)
return selectedDevice, nil
}
}
// 检测BlackHole设备
func (n *AudioRelay) AutoDetectBlackHole() *portaudio.DeviceInfo {
blackHoleNames := []string{
"BlackHole 2ch",
"BlackHole 16ch",
"BlackHole",
}
for _, device := range n.devices {
for _, name := range blackHoleNames {
if strings.Contains(strings.ToLower(device.Name), strings.ToLower(name)) {
return device
}
}
}
return nil
}
// 获取本机IP地址
func (n *AudioRelay) getLocalIPs() ([]string, error) {
var ips []string
addrs, err := net.InterfaceAddrs()
if err != nil {
return nil, err
}
for _, addr := range addrs {
ipNet, ok := addr.(*net.IPNet)
if ok && !ipNet.IP.IsLoopback() {
if ipNet.IP.To4() != nil {
// 只显示IPv4地址
ips = append(ips, ipNet.IP.String())
}
}
}
if len(ips) == 0 {
return nil, fmt.Errorf("no local IPs found")
}
return ips, nil
}
// 显示设备详细信息
func (n *AudioRelay) DisplayDeviceInfo(device *portaudio.DeviceInfo) {
fmt.Printf("\n Details:\n")
fmt.Printf(" Name: %s\n", device.Name)
fmt.Printf(" Input Channels: %d\n", device.MaxInputChannels)
fmt.Printf(" Output Channels: %d\n", device.MaxOutputChannels)
fmt.Printf(" Sample Rate: %.0f Hz\n", device.DefaultSampleRate)
fmt.Printf(" Low Latency: %.1f ms\n", device.DefaultLowInputLatency.Seconds()*1000)
fmt.Printf(" High Latency: %.1f ms\n", device.DefaultHighInputLatency.Seconds()*1000)
fmt.Printf(" Host API: %s\n", device.HostApi.Name)
fmt.Println()
}
// 启动音频捕获（使用指定设备）
func (n *AudioRelay) StartAudioCaptureWithDevice(device *portaudio.DeviceInfo) error {
buffer := make([]int16, n.bufferSize*n.channels)
fmt.Printf(" Using audio device: %s\n", device.Name)
fmt.Printf(" Sample Rate: %.0f Hz, Channels: %d, Buffer: %d samples\n",
n.sampleRate, n.channels, n.bufferSize)
stream, err := portaudio.OpenStream(
portaudio.StreamParameters{
Input: portaudio.StreamDeviceParameters{
Device: device,
Channels: n.channels,
Latency: device.DefaultLowInputLatency,
},
SampleRate: n.sampleRate,
FramesPerBuffer: len(buffer),
},
buffer,
)
if err != nil {
return fmt.Errorf("failed to open audio stream: %v", err)
}
n.stream = stream
n.isRunning = true
if err := stream.Start(); err != nil {
return fmt.Errorf(" X failed to start audio stream: %v", err)
}
fmt.Println(" √ Audio capture started")
go n.processAudio(buffer)
return nil
}
// 启动音频捕获（等待客户端）
func (n *AudioRelay) checkAndStartCapture() {
n.captureMutex.Lock()
defer n.captureMutex.Unlock()
if !n.captureStarted && n.getClientCount() > 0 {
fmt.Println("Client connected, starting audio capture...")
if err := n.StartAudioCaptureWithDevice(n.selectedDevice); err != nil {
log.Printf("Failed to start audio capture: %v", err)
return
}
n.captureStarted = true
}
}
// 停止音频捕获（客户端断开）
func (n *AudioRelay) checkAndStopCapture() {
n.captureMutex.Lock()
defer n.captureMutex.Unlock()
if n.captureStarted && n.getClientCount() == 0 {
fmt.Println("⏸️ All clients disconnected, stopping audio capture...")
if n.stream != nil {
n.stream.Stop()
n.stream.Close()
n.stream = nil
}
n.captureStarted = false
}
}
func (n *AudioRelay) processAudio(buffer []int16) {
frameCount := 0
lastStats := time.Now()
bytesTransferred := 0
silenceFrames := 0
for n.isRunning {
if n.getClientCount() == 0 {
fmt.Println(" ⏸ No clients connected, stopping audio processing")
n.captureMutex.Lock()
n.captureStarted = false
if n.stream != nil {
n.stream.Stop()
n.stream.Close()
n.stream = nil
}
n.captureMutex.Unlock()
return
}
if err := n.stream.Read(); err != nil {
log.Printf("Read error: %v", err)
time.Sleep(10 * time.Millisecond)
continue
}
frameCount++
// 静音判断
if n.isSilence(buffer) {
silenceFrames++
// 连续静音，尝试跳过处理以减少带宽
if silenceFrames > 10 {
continue
}
} else {
silenceFrames = 0
}
// 处理音频数据
processedBuffer := n.processAudioData(buffer)
audioData := n.int16ToBytes(processedBuffer)
bytesTransferred += len(audioData)
// 广播给客户端
n.broadcastToClients(audioData)
// 显示统计信息
if time.Since(lastStats) > 3*time.Second {
rate := float64(bytesTransferred) / time.Since(lastStats).Seconds() / 1024
clientCount := n.getClientCount()
status := "Normal"
if silenceFrames > 0 {
status = "Abnormal"
}
fmt.Printf("Status: %s Frames: %d, Rate: %.1f KB/s, Clients: %d\n",
status, frameCount, rate, clientCount)
bytesTransferred = 0
lastStats = time.Now()
}
}
}
// 检查静音
func (n *AudioRelay) isSilence(buffer []int16) bool {
const silenceThreshold = 1000 // 静音阈值
for i := 0; i < len(buffer); i++ {
if buffer[i] > silenceThreshold || buffer[i] < -silenceThreshold {
return false
}
}
return true
}
func (n *AudioRelay) processAudioData(buffer []int16) []int16 {
processed := make([]int16, len(buffer))
copy(processed, buffer)
for i := range processed {
// 降低音量
processed[i] = int16(float64(processed[i]) * 0.8)
// 限幅
if processed[i] > 28000 {
processed[i] = 28000
} else if processed[i] < -28000 {
processed[i] = -28000
}
}
return processed
}
func (n *AudioRelay) int16ToBytes(buffer []int16) []byte {
bytes := make([]byte, len(buffer)*2)
for i, sample := range buffer {
bytes[i*2] = byte(sample & 0xFF)
bytes[i*2+1] = byte((sample >> 8) & 0xFF)
}
return bytes
}
func (n *AudioRelay) broadcastToClients(data []byte) {
n.clientsMu.RLock()
defer n.clientsMu.RUnlock()
if len(n.clients) == 0 {
return
}
failedClients := make([]net.Conn, 0)
for client := range n.clients {
client.SetWriteDeadline(time.Now().Add(2 * time.Second))
_, err := client.Write(data)
if err != nil {
failedClients = append(failedClients, client)
}
}
if len(failedClients) > 0 {
go n.cleanupClients(failedClients)
}
}
func (n *AudioRelay) cleanupClients(failedClients []net.Conn) {
n.clientsMu.Lock()
defer n.clientsMu.Unlock()
for _, client := range failedClients {
delete(n.clients, client)
client.Close()
fmt.Printf("Client disconnected: %s\n", client.RemoteAddr())
}
// 是否需要停止音频捕获
if len(n.clients) == 0 {
go n.checkAndStopCapture()
}
}
func (n *AudioRelay) getClientCount() int {
n.clientsMu.RLock()
defer n.clientsMu.RUnlock()
return len(n.clients)
}
func (n *AudioRelay) StartTCPServer(port string) error {
var err error
n.listener, err = net.Listen("tcp", ":"+port)
if err != nil {
return err
}
fmt.Printf("TCP listening on port %s \n", port)
if ips, err := n.getLocalIPs(); err == nil {
fmt.Printf("Server addresses:\n")
for _, ip := range ips {
fmt.Printf("http://%s:%s\n", ip, port)
}
} else {
fmt.Printf("Server address: 0.0.0.0:%s\n", port)
}
return nil
}
func (n *AudioRelay) AcceptClients() {
for {
conn, err := n.listener.Accept()
if err != nil {
if n.isRunning {
log.Printf("Client connection error: %v", err)
}
return
}
if tcpConn, ok := conn.(*net.TCPConn); ok {
tcpConn.SetNoDelay(true)
tcpConn.SetWriteBuffer(32 * 1024)
tcpConn.SetReadBuffer(16 * 1024)
tcpConn.SetKeepAlive(true)
}
fmt.Printf(" √ Client connected: %s\n", conn.RemoteAddr())
n.addClient(conn)
// 检查是否需要启动音频捕获
go n.checkAndStartCapture()
}
}
func (n *AudioRelay) addClient(conn net.Conn) {
n.clientsMu.Lock()
defer n.clientsMu.Unlock()
n.clients[conn] = true
}
func (n *AudioRelay) Start() error {
fmt.Println("👊 Welcome to the audio relay —— xiaolin")
fmt.Println("=====================")
// 让用户选择输入设备
selectedDevice, err := n.SelectInputDevice()
if err != nil {
return fmt.Errorf("device selection failed: %v", err)
}
n.selectedDevice = selectedDevice
// 启动TCP服务器
if err := n.StartTCPServer("12345"); err != nil {
return err
}
// 开始接受客户端连接
go n.AcceptClients()
fmt.Println("Service started,")
fmt.Println("Waiting for receiving clients...")
select {}
}
func (n *AudioRelay) Stop() {
fmt.Println("Stopping service...")
n.isRunning = false
if n.stream != nil {
n.stream.Stop()
n.stream.Close()
fmt.Println("Audio stream closed")
}
if n.listener != nil {
n.listener.Close()
fmt.Println("TCP server closed")
}
n.clientsMu.Lock()
for client := range n.clients {
client.Close()
}
n.clients = make(map[net.Conn]bool)
n.clientsMu.Unlock()
portaudio.Terminate()
fmt.Println("Service fully stopped")
}
func main() {
relay := NewAudioRelay()
defer relay.Stop()
defer func() {
if r := recover(); r != nil {
log.Printf("Program crashed: %v", r)
}
}()
if err := relay.Start(); err != nil {
log.Fatalf("Failed to start: %v", err)
}
}
|
