feat: full WSL2 audio support and Windows audio stability fix

pkg/audio/playback_linux.go

@@ -0,0 +1,201 @@
+//go:build linux
+
+package audio
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/gordonklaus/portaudio"
+)
+
+// Player handles audio playback using PortAudio
+type Player struct {
+	stream   *portaudio.Stream
+	volume   float32
+	muted    bool
+	mu       sync.Mutex
+	running  bool
+	stopChan chan struct{}
+
+	// User buffers for mixing
+	userBuffers map[uint16][]int16
+	// User settings
+	userSettings map[uint16]*UserSettings
+	bufferMu     sync.Mutex
+}
+
+func NewPlayer() (*Player, error) {
+	if err := initPortAudio(); err != nil {
+		return nil, err
+	}
+
+	p := &Player{
+		volume:       1.0,
+		muted:        false,
+		stopChan:     make(chan struct{}),
+		userBuffers:  make(map[uint16][]int16),
+		userSettings: make(map[uint16]*UserSettings),
+	}
+
+	return p, nil
+}
+
+func (p *Player) Start() error {
+	p.mu.Lock()
+	if p.running {
+		p.mu.Unlock()
+		return nil
+	}
+
+	// Create stream (Mono, 48kHz, 16-bit)
+	// We'll use a callback-based stream for lower latency
+	var err error
+	p.stream, err = portaudio.OpenDefaultStream(0, 1, 48000, frameSamples, p.processAudio)
+	if err != nil {
+		p.mu.Unlock()
+		return fmt.Errorf("failed to open portaudio stream: %w", err)
+	}
+
+	if err := p.stream.Start(); err != nil {
+		p.stream.Close()
+		p.mu.Unlock()
+		return fmt.Errorf("failed to start portaudio stream: %w", err)
+	}
+
+	p.running = true
+	p.mu.Unlock()
+	return nil
+}
+
+func (p *Player) Stop() {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	if !p.running {
+		return
+	}
+	p.running = false
+	if p.stream != nil {
+		p.stream.Abort()
+	}
+}
+
+func (p *Player) Close() {
+	p.Stop()
+	p.mu.Lock()
+	if p.stream != nil {
+		p.stream.Close()
+	}
+	p.mu.Unlock()
+	terminatePortAudio()
+}
+
+// processAudio is the PortAudio callback
+func (p *Player) processAudio(out []int16) {
+	p.bufferMu.Lock()
+	defer p.bufferMu.Unlock()
+
+	// Initial silence
+	for i := range out {
+		out[i] = 0
+	}
+
+	if p.muted {
+		return
+	}
+
+	p.mu.Lock()
+	vol := p.volume
+	p.mu.Unlock()
+
+	mixed := make([]int32, len(out))
+
+	for id, buf := range p.userBuffers {
+		if len(buf) > 0 {
+			toTake := len(out)
+			if len(buf) < toTake {
+				toTake = len(buf)
+			}
+
+			for i := 0; i < toTake; i++ {
+				sample := int32(buf[i])
+				if settings, ok := p.userSettings[id]; ok {
+					sample = int32(float32(sample) * settings.Volume)
+				}
+				mixed[i] += sample
+			}
+
+			// Advance buffer
+			if len(buf) <= len(out) {
+				delete(p.userBuffers, id)
+			} else {
+				p.userBuffers[id] = buf[len(out):]
+			}
+		}
+	}
+
+	// Apply master volume and clip
+	for i := 0; i < len(out); i++ {
+		val := int32(float32(mixed[i]) * vol)
+		if val > 32767 {
+			val = 32767
+		} else if val < -32768 {
+			val = -32768
+		}
+		out[i] = int16(val)
+	}
+}
+
+func (p *Player) PlayPCM(senderID uint16, samples []int16) {
+	p.bufferMu.Lock()
+	defer p.bufferMu.Unlock()
+
+	if settings, ok := p.userSettings[senderID]; ok && settings.Muted {
+		return
+	}
+
+	p.userBuffers[senderID] = append(p.userBuffers[senderID], samples...)
+	if len(p.userBuffers[senderID]) > 48000*2 {
+		drop := len(p.userBuffers[senderID]) - 48000
+		p.userBuffers[senderID] = p.userBuffers[senderID][drop:]
+	}
+}
+
+func (p *Player) SetVolume(vol float32) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.volume = vol
+}
+
+func (p *Player) SetMuted(muted bool) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.muted = muted
+}
+
+func (p *Player) SetUserVolume(clientID uint16, vol float32) {
+	p.bufferMu.Lock()
+	defer p.bufferMu.Unlock()
+	if _, ok := p.userSettings[clientID]; !ok {
+		p.userSettings[clientID] = &UserSettings{Volume: 1.0, Muted: false}
+	}
+	p.userSettings[clientID].Volume = vol
+}
+
+func (p *Player) SetUserMuted(clientID uint16, muted bool) {
+	p.bufferMu.Lock()
+	defer p.bufferMu.Unlock()
+	if _, ok := p.userSettings[clientID]; !ok {
+		p.userSettings[clientID] = &UserSettings{Volume: 1.0, Muted: false}
+	}
+	p.userSettings[clientID].Muted = muted
+}
+
+func (p *Player) GetUserSettings(clientID uint16) (float32, bool) {
+	p.bufferMu.Lock()
+	defer p.bufferMu.Unlock()
+	if settings, ok := p.userSettings[clientID]; ok {
+		return settings.Volume, settings.Muted
+	}
+	return 1.0, false
+}