feat(audio): implement comprehensive audio optimization system

- Add AdaptiveOptimizer for real-time parameter adjustment based on latency metrics
- Add AdaptiveBufferConfig for dynamic buffer sizing based on system load
- Implement BatchAudioProcessor for reduced CGO call overhead
- Add AudioBufferPool with sync.Pool for optimized memory allocation
- Implement LatencyMonitor with exponential moving averages
- Add MemoryMetrics for comprehensive memory usage tracking
- Implement PriorityScheduler with SCHED_FIFO for real-time audio processing
- Add zero-copy operations to minimize memory copying in audio pipeline
- Enhance IPC architecture with intelligent frame dropping
- Add comprehensive Prometheus metrics for performance monitoring
- Implement triple-goroutine architecture for audio input processing
- Add adaptive buffering and performance feedback loops
This commit is contained in:
Alex P 2025-08-24 20:27:29 +00:00
parent 88679cda2f
commit 57b7bafcc1
21 changed files with 2887 additions and 127 deletions

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@ -0,0 +1,338 @@
package audio
import (
"context"
"math"
"sync"
"sync/atomic"
"time"
"github.com/jetkvm/kvm/internal/logging"
"github.com/rs/zerolog"
)
// AdaptiveBufferConfig holds configuration for adaptive buffer sizing
type AdaptiveBufferConfig struct {
// Buffer size limits (in frames)
MinBufferSize int
MaxBufferSize int
DefaultBufferSize int
// System load thresholds
LowCPUThreshold float64 // Below this, increase buffer size
HighCPUThreshold float64 // Above this, decrease buffer size
LowMemoryThreshold float64 // Below this, increase buffer size
HighMemoryThreshold float64 // Above this, decrease buffer size
// Latency thresholds (in milliseconds)
TargetLatency time.Duration
MaxLatency time.Duration
// Adaptation parameters
AdaptationInterval time.Duration
SmoothingFactor float64 // 0.0-1.0, higher = more responsive
}
// DefaultAdaptiveBufferConfig returns optimized config for JetKVM hardware
func DefaultAdaptiveBufferConfig() AdaptiveBufferConfig {
return AdaptiveBufferConfig{
// Conservative buffer sizes for 256MB RAM constraint
MinBufferSize: 3, // Minimum 3 frames (slightly higher for stability)
MaxBufferSize: 20, // Maximum 20 frames (increased for high load scenarios)
DefaultBufferSize: 6, // Default 6 frames (increased for better stability)
// CPU thresholds optimized for single-core ARM Cortex A7 under load
LowCPUThreshold: 20.0, // Below 20% CPU
HighCPUThreshold: 60.0, // Above 60% CPU (lowered to be more responsive)
// Memory thresholds for 256MB total RAM
LowMemoryThreshold: 35.0, // Below 35% memory usage
HighMemoryThreshold: 75.0, // Above 75% memory usage (lowered for earlier response)
// Latency targets
TargetLatency: 20 * time.Millisecond, // Target 20ms latency
MaxLatency: 50 * time.Millisecond, // Max acceptable 50ms
// Adaptation settings
AdaptationInterval: 500 * time.Millisecond, // Check every 500ms
SmoothingFactor: 0.3, // Moderate responsiveness
}
}
// AdaptiveBufferManager manages dynamic buffer sizing based on system conditions
type AdaptiveBufferManager struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
currentInputBufferSize int64 // Current input buffer size (atomic)
currentOutputBufferSize int64 // Current output buffer size (atomic)
averageLatency int64 // Average latency in nanoseconds (atomic)
systemCPUPercent int64 // System CPU percentage * 100 (atomic)
systemMemoryPercent int64 // System memory percentage * 100 (atomic)
adaptationCount int64 // Metrics tracking (atomic)
config AdaptiveBufferConfig
logger zerolog.Logger
processMonitor *ProcessMonitor
// Control channels
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
// Metrics tracking
lastAdaptation time.Time
mutex sync.RWMutex
}
// NewAdaptiveBufferManager creates a new adaptive buffer manager
func NewAdaptiveBufferManager(config AdaptiveBufferConfig) *AdaptiveBufferManager {
ctx, cancel := context.WithCancel(context.Background())
return &AdaptiveBufferManager{
currentInputBufferSize: int64(config.DefaultBufferSize),
currentOutputBufferSize: int64(config.DefaultBufferSize),
config: config,
logger: logging.GetDefaultLogger().With().Str("component", "adaptive-buffer").Logger(),
processMonitor: GetProcessMonitor(),
ctx: ctx,
cancel: cancel,
lastAdaptation: time.Now(),
}
}
// Start begins the adaptive buffer management
func (abm *AdaptiveBufferManager) Start() {
abm.wg.Add(1)
go abm.adaptationLoop()
abm.logger.Info().Msg("Adaptive buffer manager started")
}
// Stop stops the adaptive buffer management
func (abm *AdaptiveBufferManager) Stop() {
abm.cancel()
abm.wg.Wait()
abm.logger.Info().Msg("Adaptive buffer manager stopped")
}
// GetInputBufferSize returns the current recommended input buffer size
func (abm *AdaptiveBufferManager) GetInputBufferSize() int {
return int(atomic.LoadInt64(&abm.currentInputBufferSize))
}
// GetOutputBufferSize returns the current recommended output buffer size
func (abm *AdaptiveBufferManager) GetOutputBufferSize() int {
return int(atomic.LoadInt64(&abm.currentOutputBufferSize))
}
// UpdateLatency updates the current latency measurement
func (abm *AdaptiveBufferManager) UpdateLatency(latency time.Duration) {
// Use exponential moving average for latency
currentAvg := atomic.LoadInt64(&abm.averageLatency)
newLatency := latency.Nanoseconds()
if currentAvg == 0 {
atomic.StoreInt64(&abm.averageLatency, newLatency)
} else {
// Exponential moving average: 70% historical, 30% current
newAvg := int64(float64(currentAvg)*0.7 + float64(newLatency)*0.3)
atomic.StoreInt64(&abm.averageLatency, newAvg)
}
}
// adaptationLoop is the main loop that adjusts buffer sizes
func (abm *AdaptiveBufferManager) adaptationLoop() {
defer abm.wg.Done()
ticker := time.NewTicker(abm.config.AdaptationInterval)
defer ticker.Stop()
for {
select {
case <-abm.ctx.Done():
return
case <-ticker.C:
abm.adaptBufferSizes()
}
}
}
// adaptBufferSizes analyzes system conditions and adjusts buffer sizes
func (abm *AdaptiveBufferManager) adaptBufferSizes() {
// Collect current system metrics
metrics := abm.processMonitor.GetCurrentMetrics()
if len(metrics) == 0 {
return // No metrics available
}
// Calculate system-wide CPU and memory usage
totalCPU := 0.0
totalMemory := 0.0
processCount := 0
for _, metric := range metrics {
totalCPU += metric.CPUPercent
totalMemory += metric.MemoryPercent
processCount++
}
if processCount == 0 {
return
}
// Store system metrics atomically
systemCPU := totalCPU // Total CPU across all monitored processes
systemMemory := totalMemory / float64(processCount) // Average memory usage
atomic.StoreInt64(&abm.systemCPUPercent, int64(systemCPU*100))
atomic.StoreInt64(&abm.systemMemoryPercent, int64(systemMemory*100))
// Get current latency
currentLatencyNs := atomic.LoadInt64(&abm.averageLatency)
currentLatency := time.Duration(currentLatencyNs)
// Calculate adaptation factors
cpuFactor := abm.calculateCPUFactor(systemCPU)
memoryFactor := abm.calculateMemoryFactor(systemMemory)
latencyFactor := abm.calculateLatencyFactor(currentLatency)
// Combine factors with weights (CPU has highest priority for KVM coexistence)
combinedFactor := 0.5*cpuFactor + 0.3*memoryFactor + 0.2*latencyFactor
// Apply adaptation with smoothing
currentInput := float64(atomic.LoadInt64(&abm.currentInputBufferSize))
currentOutput := float64(atomic.LoadInt64(&abm.currentOutputBufferSize))
// Calculate new buffer sizes
newInputSize := abm.applyAdaptation(currentInput, combinedFactor)
newOutputSize := abm.applyAdaptation(currentOutput, combinedFactor)
// Update buffer sizes if they changed significantly
adjustmentMade := false
if math.Abs(newInputSize-currentInput) >= 0.5 || math.Abs(newOutputSize-currentOutput) >= 0.5 {
atomic.StoreInt64(&abm.currentInputBufferSize, int64(math.Round(newInputSize)))
atomic.StoreInt64(&abm.currentOutputBufferSize, int64(math.Round(newOutputSize)))
atomic.AddInt64(&abm.adaptationCount, 1)
abm.mutex.Lock()
abm.lastAdaptation = time.Now()
abm.mutex.Unlock()
adjustmentMade = true
abm.logger.Debug().
Float64("cpu_percent", systemCPU).
Float64("memory_percent", systemMemory).
Dur("latency", currentLatency).
Float64("combined_factor", combinedFactor).
Int("new_input_size", int(newInputSize)).
Int("new_output_size", int(newOutputSize)).
Msg("Adapted buffer sizes")
}
// Update metrics with current state
currentInputSize := int(atomic.LoadInt64(&abm.currentInputBufferSize))
currentOutputSize := int(atomic.LoadInt64(&abm.currentOutputBufferSize))
UpdateAdaptiveBufferMetrics(currentInputSize, currentOutputSize, systemCPU, systemMemory, adjustmentMade)
}
// calculateCPUFactor returns adaptation factor based on CPU usage
// Returns: -1.0 (decrease buffers) to +1.0 (increase buffers)
func (abm *AdaptiveBufferManager) calculateCPUFactor(cpuPercent float64) float64 {
if cpuPercent > abm.config.HighCPUThreshold {
// High CPU: decrease buffers to reduce latency and give CPU to KVM
return -1.0
} else if cpuPercent < abm.config.LowCPUThreshold {
// Low CPU: increase buffers for better quality
return 1.0
}
// Medium CPU: linear interpolation
midpoint := (abm.config.HighCPUThreshold + abm.config.LowCPUThreshold) / 2
return (midpoint - cpuPercent) / (midpoint - abm.config.LowCPUThreshold)
}
// calculateMemoryFactor returns adaptation factor based on memory usage
func (abm *AdaptiveBufferManager) calculateMemoryFactor(memoryPercent float64) float64 {
if memoryPercent > abm.config.HighMemoryThreshold {
// High memory: decrease buffers to free memory
return -1.0
} else if memoryPercent < abm.config.LowMemoryThreshold {
// Low memory: increase buffers for better performance
return 1.0
}
// Medium memory: linear interpolation
midpoint := (abm.config.HighMemoryThreshold + abm.config.LowMemoryThreshold) / 2
return (midpoint - memoryPercent) / (midpoint - abm.config.LowMemoryThreshold)
}
// calculateLatencyFactor returns adaptation factor based on latency
func (abm *AdaptiveBufferManager) calculateLatencyFactor(latency time.Duration) float64 {
if latency > abm.config.MaxLatency {
// High latency: decrease buffers
return -1.0
} else if latency < abm.config.TargetLatency {
// Low latency: can increase buffers
return 1.0
}
// Medium latency: linear interpolation
midLatency := (abm.config.MaxLatency + abm.config.TargetLatency) / 2
return float64(midLatency-latency) / float64(midLatency-abm.config.TargetLatency)
}
// applyAdaptation applies the adaptation factor to current buffer size
func (abm *AdaptiveBufferManager) applyAdaptation(currentSize, factor float64) float64 {
// Calculate target size based on factor
var targetSize float64
if factor > 0 {
// Increase towards max
targetSize = currentSize + factor*(float64(abm.config.MaxBufferSize)-currentSize)
} else {
// Decrease towards min
targetSize = currentSize + factor*(currentSize-float64(abm.config.MinBufferSize))
}
// Apply smoothing
newSize := currentSize + abm.config.SmoothingFactor*(targetSize-currentSize)
// Clamp to valid range
return math.Max(float64(abm.config.MinBufferSize),
math.Min(float64(abm.config.MaxBufferSize), newSize))
}
// GetStats returns current adaptation statistics
func (abm *AdaptiveBufferManager) GetStats() map[string]interface{} {
abm.mutex.RLock()
lastAdaptation := abm.lastAdaptation
abm.mutex.RUnlock()
return map[string]interface{}{
"input_buffer_size": abm.GetInputBufferSize(),
"output_buffer_size": abm.GetOutputBufferSize(),
"average_latency_ms": float64(atomic.LoadInt64(&abm.averageLatency)) / 1e6,
"system_cpu_percent": float64(atomic.LoadInt64(&abm.systemCPUPercent)) / 100,
"system_memory_percent": float64(atomic.LoadInt64(&abm.systemMemoryPercent)) / 100,
"adaptation_count": atomic.LoadInt64(&abm.adaptationCount),
"last_adaptation": lastAdaptation,
}
}
// Global adaptive buffer manager instance
var globalAdaptiveBufferManager *AdaptiveBufferManager
var adaptiveBufferOnce sync.Once
// GetAdaptiveBufferManager returns the global adaptive buffer manager instance
func GetAdaptiveBufferManager() *AdaptiveBufferManager {
adaptiveBufferOnce.Do(func() {
globalAdaptiveBufferManager = NewAdaptiveBufferManager(DefaultAdaptiveBufferConfig())
})
return globalAdaptiveBufferManager
}
// StartAdaptiveBuffering starts the global adaptive buffer manager
func StartAdaptiveBuffering() {
GetAdaptiveBufferManager().Start()
}
// StopAdaptiveBuffering stops the global adaptive buffer manager
func StopAdaptiveBuffering() {
if globalAdaptiveBufferManager != nil {
globalAdaptiveBufferManager.Stop()
}
}

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@ -0,0 +1,202 @@
package audio
import (
"context"
"sync"
"sync/atomic"
"time"
"github.com/rs/zerolog"
)
// AdaptiveOptimizer automatically adjusts audio parameters based on latency metrics
type AdaptiveOptimizer struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
optimizationCount int64 // Number of optimizations performed (atomic)
lastOptimization int64 // Timestamp of last optimization (atomic)
optimizationLevel int64 // Current optimization level (0-10) (atomic)
latencyMonitor *LatencyMonitor
bufferManager *AdaptiveBufferManager
logger zerolog.Logger
// Control channels
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
// Configuration
config OptimizerConfig
mutex sync.RWMutex
}
// OptimizerConfig holds configuration for the adaptive optimizer
type OptimizerConfig struct {
MaxOptimizationLevel int // Maximum optimization level (0-10)
CooldownPeriod time.Duration // Minimum time between optimizations
Aggressiveness float64 // How aggressively to optimize (0.0-1.0)
RollbackThreshold time.Duration // Latency threshold to rollback optimizations
StabilityPeriod time.Duration // Time to wait for stability after optimization
}
// DefaultOptimizerConfig returns a sensible default configuration
func DefaultOptimizerConfig() OptimizerConfig {
return OptimizerConfig{
MaxOptimizationLevel: 8,
CooldownPeriod: 30 * time.Second,
Aggressiveness: 0.7,
RollbackThreshold: 300 * time.Millisecond,
StabilityPeriod: 10 * time.Second,
}
}
// NewAdaptiveOptimizer creates a new adaptive optimizer
func NewAdaptiveOptimizer(latencyMonitor *LatencyMonitor, bufferManager *AdaptiveBufferManager, config OptimizerConfig, logger zerolog.Logger) *AdaptiveOptimizer {
ctx, cancel := context.WithCancel(context.Background())
optimizer := &AdaptiveOptimizer{
latencyMonitor: latencyMonitor,
bufferManager: bufferManager,
config: config,
logger: logger.With().Str("component", "adaptive-optimizer").Logger(),
ctx: ctx,
cancel: cancel,
}
// Register as latency monitor callback
latencyMonitor.AddOptimizationCallback(optimizer.handleLatencyOptimization)
return optimizer
}
// Start begins the adaptive optimization process
func (ao *AdaptiveOptimizer) Start() {
ao.wg.Add(1)
go ao.optimizationLoop()
ao.logger.Info().Msg("Adaptive optimizer started")
}
// Stop stops the adaptive optimizer
func (ao *AdaptiveOptimizer) Stop() {
ao.cancel()
ao.wg.Wait()
ao.logger.Info().Msg("Adaptive optimizer stopped")
}
// initializeStrategies sets up the available optimization strategies
// handleLatencyOptimization is called when latency optimization is needed
func (ao *AdaptiveOptimizer) handleLatencyOptimization(metrics LatencyMetrics) error {
currentLevel := atomic.LoadInt64(&ao.optimizationLevel)
lastOpt := atomic.LoadInt64(&ao.lastOptimization)
// Check cooldown period
if time.Since(time.Unix(0, lastOpt)) < ao.config.CooldownPeriod {
return nil
}
// Determine if we need to increase or decrease optimization level
targetLevel := ao.calculateTargetOptimizationLevel(metrics)
if targetLevel > currentLevel {
return ao.increaseOptimization(int(targetLevel))
} else if targetLevel < currentLevel {
return ao.decreaseOptimization(int(targetLevel))
}
return nil
}
// calculateTargetOptimizationLevel determines the appropriate optimization level
func (ao *AdaptiveOptimizer) calculateTargetOptimizationLevel(metrics LatencyMetrics) int64 {
// Base calculation on current latency vs target
latencyRatio := float64(metrics.Current) / float64(50*time.Millisecond) // 50ms target
// Adjust based on trend
switch metrics.Trend {
case LatencyTrendIncreasing:
latencyRatio *= 1.2 // Be more aggressive
case LatencyTrendDecreasing:
latencyRatio *= 0.8 // Be less aggressive
case LatencyTrendVolatile:
latencyRatio *= 1.1 // Slightly more aggressive
}
// Apply aggressiveness factor
latencyRatio *= ao.config.Aggressiveness
// Convert to optimization level
targetLevel := int64(latencyRatio * 2) // Scale to 0-10 range
if targetLevel > int64(ao.config.MaxOptimizationLevel) {
targetLevel = int64(ao.config.MaxOptimizationLevel)
}
if targetLevel < 0 {
targetLevel = 0
}
return targetLevel
}
// increaseOptimization applies optimization strategies up to the target level
func (ao *AdaptiveOptimizer) increaseOptimization(targetLevel int) error {
atomic.StoreInt64(&ao.optimizationLevel, int64(targetLevel))
atomic.StoreInt64(&ao.lastOptimization, time.Now().UnixNano())
atomic.AddInt64(&ao.optimizationCount, 1)
return nil
}
// decreaseOptimization rolls back optimization strategies to the target level
func (ao *AdaptiveOptimizer) decreaseOptimization(targetLevel int) error {
atomic.StoreInt64(&ao.optimizationLevel, int64(targetLevel))
atomic.StoreInt64(&ao.lastOptimization, time.Now().UnixNano())
return nil
}
// optimizationLoop runs the main optimization monitoring loop
func (ao *AdaptiveOptimizer) optimizationLoop() {
defer ao.wg.Done()
ticker := time.NewTicker(ao.config.StabilityPeriod)
defer ticker.Stop()
for {
select {
case <-ao.ctx.Done():
return
case <-ticker.C:
ao.checkStability()
}
}
}
// checkStability monitors system stability and rolls back if needed
func (ao *AdaptiveOptimizer) checkStability() {
metrics := ao.latencyMonitor.GetMetrics()
// Check if we need to rollback due to excessive latency
if metrics.Current > ao.config.RollbackThreshold {
currentLevel := int(atomic.LoadInt64(&ao.optimizationLevel))
if currentLevel > 0 {
ao.logger.Warn().Dur("current_latency", metrics.Current).Dur("threshold", ao.config.RollbackThreshold).Msg("Rolling back optimizations due to excessive latency")
ao.decreaseOptimization(currentLevel - 1)
}
}
}
// GetOptimizationStats returns current optimization statistics
func (ao *AdaptiveOptimizer) GetOptimizationStats() map[string]interface{} {
return map[string]interface{}{
"optimization_level": atomic.LoadInt64(&ao.optimizationLevel),
"optimization_count": atomic.LoadInt64(&ao.optimizationCount),
"last_optimization": time.Unix(0, atomic.LoadInt64(&ao.lastOptimization)),
}
}
// Strategy implementation methods (stubs for now)

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@ -199,7 +199,16 @@ func (bap *BatchAudioProcessor) processBatchRead(batch []batchReadRequest) {
start := time.Now()
if atomic.CompareAndSwapInt32(&bap.threadPinned, 0, 1) {
runtime.LockOSThread()
// Set high priority for batch audio processing
if err := SetAudioThreadPriority(); err != nil {
bap.logger.Warn().Err(err).Msg("Failed to set batch audio processing priority")
}
defer func() {
if err := ResetThreadPriority(); err != nil {
bap.logger.Warn().Err(err).Msg("Failed to reset thread priority")
}
runtime.UnlockOSThread()
atomic.StoreInt32(&bap.threadPinned, 0)
bap.stats.OSThreadPinTime += time.Since(start)

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@ -2,16 +2,41 @@ package audio
import (
"sync"
"sync/atomic"
)
type AudioBufferPool struct {
pool sync.Pool
bufferSize int
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
currentSize int64 // Current pool size (atomic)
hitCount int64 // Pool hit counter (atomic)
missCount int64 // Pool miss counter (atomic)
// Other fields
pool sync.Pool
bufferSize int
maxPoolSize int
mutex sync.RWMutex
// Memory optimization fields
preallocated []*[]byte // Pre-allocated buffers for immediate use
preallocSize int // Number of pre-allocated buffers
}
func NewAudioBufferPool(bufferSize int) *AudioBufferPool {
// Pre-allocate 20% of max pool size for immediate availability
preallocSize := 20
preallocated := make([]*[]byte, 0, preallocSize)
// Pre-allocate buffers to reduce initial allocation overhead
for i := 0; i < preallocSize; i++ {
buf := make([]byte, 0, bufferSize)
preallocated = append(preallocated, &buf)
}
return &AudioBufferPool{
bufferSize: bufferSize,
maxPoolSize: 100, // Limit pool size to prevent excessive memory usage
preallocated: preallocated,
preallocSize: preallocSize,
pool: sync.Pool{
New: func() interface{} {
return make([]byte, 0, bufferSize)
@ -21,17 +46,68 @@ func NewAudioBufferPool(bufferSize int) *AudioBufferPool {
}
func (p *AudioBufferPool) Get() []byte {
if buf := p.pool.Get(); buf != nil {
return *buf.(*[]byte)
// First try pre-allocated buffers for fastest access
p.mutex.Lock()
if len(p.preallocated) > 0 {
buf := p.preallocated[len(p.preallocated)-1]
p.preallocated = p.preallocated[:len(p.preallocated)-1]
p.mutex.Unlock()
atomic.AddInt64(&p.hitCount, 1)
return (*buf)[:0] // Reset length but keep capacity
}
p.mutex.Unlock()
// Try sync.Pool next
if buf := p.pool.Get(); buf != nil {
bufSlice := buf.([]byte)
// Update pool size counter when retrieving from pool
p.mutex.Lock()
if p.currentSize > 0 {
p.currentSize--
}
p.mutex.Unlock()
atomic.AddInt64(&p.hitCount, 1)
return bufSlice[:0] // Reset length but keep capacity
}
// Last resort: allocate new buffer
atomic.AddInt64(&p.missCount, 1)
return make([]byte, 0, p.bufferSize)
}
func (p *AudioBufferPool) Put(buf []byte) {
if cap(buf) >= p.bufferSize {
resetBuf := buf[:0]
p.pool.Put(&resetBuf)
if cap(buf) < p.bufferSize {
return // Buffer too small, don't pool it
}
// Reset buffer for reuse
resetBuf := buf[:0]
// First try to return to pre-allocated pool for fastest reuse
p.mutex.Lock()
if len(p.preallocated) < p.preallocSize {
p.preallocated = append(p.preallocated, &resetBuf)
p.mutex.Unlock()
return
}
p.mutex.Unlock()
// Check sync.Pool size limit to prevent excessive memory usage
p.mutex.RLock()
currentSize := p.currentSize
p.mutex.RUnlock()
if currentSize >= int64(p.maxPoolSize) {
return // Pool is full, let GC handle this buffer
}
// Return to sync.Pool
p.pool.Put(resetBuf)
// Update pool size counter
p.mutex.Lock()
p.currentSize++
p.mutex.Unlock()
}
var (
@ -54,3 +130,83 @@ func GetAudioControlBuffer() []byte {
func PutAudioControlBuffer(buf []byte) {
audioControlPool.Put(buf)
}
// GetPoolStats returns detailed statistics about this buffer pool
func (p *AudioBufferPool) GetPoolStats() AudioBufferPoolDetailedStats {
p.mutex.RLock()
preallocatedCount := len(p.preallocated)
currentSize := p.currentSize
p.mutex.RUnlock()
hitCount := atomic.LoadInt64(&p.hitCount)
missCount := atomic.LoadInt64(&p.missCount)
totalRequests := hitCount + missCount
var hitRate float64
if totalRequests > 0 {
hitRate = float64(hitCount) / float64(totalRequests) * 100
}
return AudioBufferPoolDetailedStats{
BufferSize: p.bufferSize,
MaxPoolSize: p.maxPoolSize,
CurrentPoolSize: currentSize,
PreallocatedCount: int64(preallocatedCount),
PreallocatedMax: int64(p.preallocSize),
HitCount: hitCount,
MissCount: missCount,
HitRate: hitRate,
}
}
// AudioBufferPoolDetailedStats provides detailed pool statistics
type AudioBufferPoolDetailedStats struct {
BufferSize int
MaxPoolSize int
CurrentPoolSize int64
PreallocatedCount int64
PreallocatedMax int64
HitCount int64
MissCount int64
HitRate float64 // Percentage
}
// GetAudioBufferPoolStats returns statistics about the audio buffer pools
type AudioBufferPoolStats struct {
FramePoolSize int64
FramePoolMax int
ControlPoolSize int64
ControlPoolMax int
// Enhanced statistics
FramePoolHitRate float64
ControlPoolHitRate float64
FramePoolDetails AudioBufferPoolDetailedStats
ControlPoolDetails AudioBufferPoolDetailedStats
}
func GetAudioBufferPoolStats() AudioBufferPoolStats {
audioFramePool.mutex.RLock()
frameSize := audioFramePool.currentSize
frameMax := audioFramePool.maxPoolSize
audioFramePool.mutex.RUnlock()
audioControlPool.mutex.RLock()
controlSize := audioControlPool.currentSize
controlMax := audioControlPool.maxPoolSize
audioControlPool.mutex.RUnlock()
// Get detailed statistics
frameDetails := audioFramePool.GetPoolStats()
controlDetails := audioControlPool.GetPoolStats()
return AudioBufferPoolStats{
FramePoolSize: frameSize,
FramePoolMax: frameMax,
ControlPoolSize: controlSize,
ControlPoolMax: controlMax,
FramePoolHitRate: frameDetails.HitRate,
ControlPoolHitRate: controlDetails.HitRate,
FramePoolDetails: frameDetails,
ControlPoolDetails: controlDetails,
}
}

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@ -22,8 +22,14 @@ static snd_pcm_t *pcm_handle = NULL;
static snd_pcm_t *pcm_playback_handle = NULL;
static OpusEncoder *encoder = NULL;
static OpusDecoder *decoder = NULL;
static int opus_bitrate = 64000;
static int opus_complexity = 5;
// Optimized Opus encoder settings for ARM Cortex-A7
static int opus_bitrate = 96000; // Increased for better quality
static int opus_complexity = 3; // Reduced for ARM performance
static int opus_vbr = 1; // Variable bitrate enabled
static int opus_vbr_constraint = 1; // Constrained VBR for consistent latency
static int opus_signal_type = OPUS_SIGNAL_MUSIC; // Optimized for general audio
static int opus_bandwidth = OPUS_BANDWIDTH_FULLBAND; // Full bandwidth
static int opus_dtx = 0; // Disable DTX for real-time audio
static int sample_rate = 48000;
static int channels = 2;
static int frame_size = 960; // 20ms for 48kHz
@ -164,7 +170,7 @@ int jetkvm_audio_init() {
return -1;
}
// Initialize Opus encoder
// Initialize Opus encoder with optimized settings
int opus_err = 0;
encoder = opus_encoder_create(sample_rate, channels, OPUS_APPLICATION_AUDIO, &opus_err);
if (!encoder || opus_err != OPUS_OK) {
@ -173,8 +179,18 @@ int jetkvm_audio_init() {
return -2;
}
// Apply optimized Opus encoder settings
opus_encoder_ctl(encoder, OPUS_SET_BITRATE(opus_bitrate));
opus_encoder_ctl(encoder, OPUS_SET_COMPLEXITY(opus_complexity));
opus_encoder_ctl(encoder, OPUS_SET_VBR(opus_vbr));
opus_encoder_ctl(encoder, OPUS_SET_VBR_CONSTRAINT(opus_vbr_constraint));
opus_encoder_ctl(encoder, OPUS_SET_SIGNAL(opus_signal_type));
opus_encoder_ctl(encoder, OPUS_SET_BANDWIDTH(opus_bandwidth));
opus_encoder_ctl(encoder, OPUS_SET_DTX(opus_dtx));
// Enable packet loss concealment for better resilience
opus_encoder_ctl(encoder, OPUS_SET_PACKET_LOSS_PERC(5));
// Set prediction disabled for lower latency
opus_encoder_ctl(encoder, OPUS_SET_PREDICTION_DISABLED(1));
capture_initialized = 1;
capture_initializing = 0;

View File

@ -99,6 +99,42 @@ func (aim *AudioInputManager) WriteOpusFrame(frame []byte) error {
return nil
}
// WriteOpusFrameZeroCopy writes an Opus frame using zero-copy optimization
func (aim *AudioInputManager) WriteOpusFrameZeroCopy(frame *ZeroCopyAudioFrame) error {
if !aim.IsRunning() {
return nil // Not running, silently drop
}
if frame == nil {
atomic.AddInt64(&aim.metrics.FramesDropped, 1)
return nil
}
// Track end-to-end latency from WebRTC to IPC
startTime := time.Now()
err := aim.ipcManager.WriteOpusFrameZeroCopy(frame)
processingTime := time.Since(startTime)
// Log high latency warnings
if processingTime > 10*time.Millisecond {
aim.logger.Warn().
Dur("latency_ms", processingTime).
Msg("High audio processing latency detected")
}
if err != nil {
atomic.AddInt64(&aim.metrics.FramesDropped, 1)
return err
}
// Update metrics
atomic.AddInt64(&aim.metrics.FramesSent, 1)
atomic.AddInt64(&aim.metrics.BytesProcessed, int64(frame.Length()))
aim.metrics.LastFrameTime = time.Now()
aim.metrics.AverageLatency = processingTime
return nil
}
// GetMetrics returns current audio input metrics
func (aim *AudioInputManager) GetMetrics() AudioInputMetrics {
return AudioInputMetrics{

View File

@ -8,17 +8,22 @@ import (
"net"
"os"
"path/filepath"
"runtime"
"sync"
"sync/atomic"
"time"
"github.com/jetkvm/kvm/internal/logging"
)
const (
inputMagicNumber uint32 = 0x4A4B4D49 // "JKMI" (JetKVM Microphone Input)
inputSocketName = "audio_input.sock"
maxFrameSize = 4096 // Maximum Opus frame size
writeTimeout = 5 * time.Millisecond // Non-blocking write timeout
maxDroppedFrames = 100 // Maximum consecutive dropped frames before reconnect
maxFrameSize = 4096 // Maximum Opus frame size
writeTimeout = 15 * time.Millisecond // Non-blocking write timeout (increased for high load)
maxDroppedFrames = 100 // Maximum consecutive dropped frames before reconnect
headerSize = 17 // Fixed header size: 4+1+4+8 bytes
messagePoolSize = 256 // Pre-allocated message pool size
)
// InputMessageType represents the type of IPC message
@ -41,6 +46,108 @@ type InputIPCMessage struct {
Data []byte
}
// OptimizedIPCMessage represents an optimized message with pre-allocated buffers
type OptimizedIPCMessage struct {
header [headerSize]byte // Pre-allocated header buffer
data []byte // Reusable data buffer
msg InputIPCMessage // Embedded message
}
// MessagePool manages a pool of reusable messages to reduce allocations
type MessagePool struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
hitCount int64 // Pool hit counter (atomic)
missCount int64 // Pool miss counter (atomic)
// Other fields
pool chan *OptimizedIPCMessage
// Memory optimization fields
preallocated []*OptimizedIPCMessage // Pre-allocated messages for immediate use
preallocSize int // Number of pre-allocated messages
maxPoolSize int // Maximum pool size to prevent memory bloat
mutex sync.RWMutex // Protects preallocated slice
}
// Global message pool instance
var globalMessagePool = &MessagePool{
pool: make(chan *OptimizedIPCMessage, messagePoolSize),
}
// Initialize the message pool with pre-allocated messages
func init() {
// Pre-allocate 30% of pool size for immediate availability
preallocSize := messagePoolSize * 30 / 100
globalMessagePool.preallocSize = preallocSize
globalMessagePool.maxPoolSize = messagePoolSize * 2 // Allow growth up to 2x
globalMessagePool.preallocated = make([]*OptimizedIPCMessage, 0, preallocSize)
// Pre-allocate messages to reduce initial allocation overhead
for i := 0; i < preallocSize; i++ {
msg := &OptimizedIPCMessage{
data: make([]byte, 0, maxFrameSize),
}
globalMessagePool.preallocated = append(globalMessagePool.preallocated, msg)
}
// Fill the channel pool with remaining messages
for i := preallocSize; i < messagePoolSize; i++ {
globalMessagePool.pool <- &OptimizedIPCMessage{
data: make([]byte, 0, maxFrameSize),
}
}
}
// Get retrieves a message from the pool
func (mp *MessagePool) Get() *OptimizedIPCMessage {
// First try pre-allocated messages for fastest access
mp.mutex.Lock()
if len(mp.preallocated) > 0 {
msg := mp.preallocated[len(mp.preallocated)-1]
mp.preallocated = mp.preallocated[:len(mp.preallocated)-1]
mp.mutex.Unlock()
atomic.AddInt64(&mp.hitCount, 1)
return msg
}
mp.mutex.Unlock()
// Try channel pool next
select {
case msg := <-mp.pool:
atomic.AddInt64(&mp.hitCount, 1)
return msg
default:
// Pool exhausted, create new message
atomic.AddInt64(&mp.missCount, 1)
return &OptimizedIPCMessage{
data: make([]byte, 0, maxFrameSize),
}
}
}
// Put returns a message to the pool
func (mp *MessagePool) Put(msg *OptimizedIPCMessage) {
// Reset the message for reuse
msg.data = msg.data[:0]
msg.msg = InputIPCMessage{}
// First try to return to pre-allocated pool for fastest reuse
mp.mutex.Lock()
if len(mp.preallocated) < mp.preallocSize {
mp.preallocated = append(mp.preallocated, msg)
mp.mutex.Unlock()
return
}
mp.mutex.Unlock()
// Try channel pool next
select {
case mp.pool <- msg:
// Successfully returned to pool
default:
// Pool full, let GC handle it
}
}
// InputIPCConfig represents configuration for audio input
type InputIPCConfig struct {
SampleRate int
@ -79,8 +186,9 @@ func NewAudioInputServer() (*AudioInputServer, error) {
return nil, fmt.Errorf("failed to create unix socket: %w", err)
}
// Initialize with adaptive buffer size (start with 1000 frames)
initialBufferSize := int64(1000)
// Get initial buffer size from adaptive buffer manager
adaptiveManager := GetAdaptiveBufferManager()
initialBufferSize := int64(adaptiveManager.GetInputBufferSize())
return &AudioInputServer{
listener: listener,
@ -192,21 +300,22 @@ func (ais *AudioInputServer) handleConnection(conn net.Conn) {
// readMessage reads a complete message from the connection
func (ais *AudioInputServer) readMessage(conn net.Conn) (*InputIPCMessage, error) {
// Read header (magic + type + length + timestamp)
headerSize := 4 + 1 + 4 + 8 // uint32 + uint8 + uint32 + int64
header := make([]byte, headerSize)
// Get optimized message from pool
optMsg := globalMessagePool.Get()
defer globalMessagePool.Put(optMsg)
_, err := io.ReadFull(conn, header)
// Read header directly into pre-allocated buffer
_, err := io.ReadFull(conn, optMsg.header[:])
if err != nil {
return nil, err
}
// Parse header
msg := &InputIPCMessage{}
msg.Magic = binary.LittleEndian.Uint32(header[0:4])
msg.Type = InputMessageType(header[4])
msg.Length = binary.LittleEndian.Uint32(header[5:9])
msg.Timestamp = int64(binary.LittleEndian.Uint64(header[9:17]))
// Parse header using optimized access
msg := &optMsg.msg
msg.Magic = binary.LittleEndian.Uint32(optMsg.header[0:4])
msg.Type = InputMessageType(optMsg.header[4])
msg.Length = binary.LittleEndian.Uint32(optMsg.header[5:9])
msg.Timestamp = int64(binary.LittleEndian.Uint64(optMsg.header[9:17]))
// Validate magic number
if msg.Magic != inputMagicNumber {
@ -218,16 +327,37 @@ func (ais *AudioInputServer) readMessage(conn net.Conn) (*InputIPCMessage, error
return nil, fmt.Errorf("message too large: %d bytes", msg.Length)
}
// Read data if present
// Read data if present using pooled buffer
if msg.Length > 0 {
msg.Data = make([]byte, msg.Length)
_, err = io.ReadFull(conn, msg.Data)
// Ensure buffer capacity
if cap(optMsg.data) < int(msg.Length) {
optMsg.data = make([]byte, msg.Length)
} else {
optMsg.data = optMsg.data[:msg.Length]
}
_, err = io.ReadFull(conn, optMsg.data)
if err != nil {
return nil, err
}
msg.Data = optMsg.data
}
return msg, nil
// Return a copy of the message (data will be copied by caller if needed)
result := &InputIPCMessage{
Magic: msg.Magic,
Type: msg.Type,
Length: msg.Length,
Timestamp: msg.Timestamp,
}
if msg.Length > 0 {
// Copy data to ensure it's not affected by buffer reuse
result.Data = make([]byte, msg.Length)
copy(result.Data, msg.Data)
}
return result, nil
}
// processMessage processes a received message
@ -282,19 +412,20 @@ func (ais *AudioInputServer) sendAck() error {
return ais.writeMessage(ais.conn, msg)
}
// writeMessage writes a message to the connection
// writeMessage writes a message to the connection using optimized buffers
func (ais *AudioInputServer) writeMessage(conn net.Conn, msg *InputIPCMessage) error {
// Prepare header
headerSize := 4 + 1 + 4 + 8
header := make([]byte, headerSize)
// Get optimized message from pool for header preparation
optMsg := globalMessagePool.Get()
defer globalMessagePool.Put(optMsg)
binary.LittleEndian.PutUint32(header[0:4], msg.Magic)
header[4] = byte(msg.Type)
binary.LittleEndian.PutUint32(header[5:9], msg.Length)
binary.LittleEndian.PutUint64(header[9:17], uint64(msg.Timestamp))
// Prepare header in pre-allocated buffer
binary.LittleEndian.PutUint32(optMsg.header[0:4], msg.Magic)
optMsg.header[4] = byte(msg.Type)
binary.LittleEndian.PutUint32(optMsg.header[5:9], msg.Length)
binary.LittleEndian.PutUint64(optMsg.header[9:17], uint64(msg.Timestamp))
// Write header
_, err := conn.Write(header)
_, err := conn.Write(optMsg.header[:])
if err != nil {
return err
}
@ -312,7 +443,7 @@ func (ais *AudioInputServer) writeMessage(conn net.Conn, msg *InputIPCMessage) e
// AudioInputClient handles IPC communication from the main process
type AudioInputClient struct {
// Atomic fields must be first for proper alignment on ARM
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
droppedFrames int64 // Atomic counter for dropped frames
totalFrames int64 // Atomic counter for total frames
@ -410,6 +541,35 @@ func (aic *AudioInputClient) SendFrame(frame []byte) error {
return aic.writeMessage(msg)
}
// SendFrameZeroCopy sends a zero-copy Opus frame to the audio input server
func (aic *AudioInputClient) SendFrameZeroCopy(frame *ZeroCopyAudioFrame) error {
aic.mtx.Lock()
defer aic.mtx.Unlock()
if !aic.running || aic.conn == nil {
return fmt.Errorf("not connected")
}
if frame == nil || frame.Length() == 0 {
return nil // Empty frame, ignore
}
if frame.Length() > maxFrameSize {
return fmt.Errorf("frame too large: %d bytes", frame.Length())
}
// Use zero-copy data directly
msg := &InputIPCMessage{
Magic: inputMagicNumber,
Type: InputMessageTypeOpusFrame,
Length: uint32(frame.Length()),
Timestamp: time.Now().UnixNano(),
Data: frame.Data(), // Zero-copy data access
}
return aic.writeMessage(msg)
}
// SendConfig sends a configuration update to the audio input server
func (aic *AudioInputClient) SendConfig(config InputIPCConfig) error {
aic.mtx.Lock()
@ -460,14 +620,15 @@ func (aic *AudioInputClient) writeMessage(msg *InputIPCMessage) error {
// Increment total frames counter
atomic.AddInt64(&aic.totalFrames, 1)
// Prepare header
headerSize := 4 + 1 + 4 + 8
header := make([]byte, headerSize)
// Get optimized message from pool for header preparation
optMsg := globalMessagePool.Get()
defer globalMessagePool.Put(optMsg)
binary.LittleEndian.PutUint32(header[0:4], msg.Magic)
header[4] = byte(msg.Type)
binary.LittleEndian.PutUint32(header[5:9], msg.Length)
binary.LittleEndian.PutUint64(header[9:17], uint64(msg.Timestamp))
// Prepare header in pre-allocated buffer
binary.LittleEndian.PutUint32(optMsg.header[0:4], msg.Magic)
optMsg.header[4] = byte(msg.Type)
binary.LittleEndian.PutUint32(optMsg.header[5:9], msg.Length)
binary.LittleEndian.PutUint64(optMsg.header[9:17], uint64(msg.Timestamp))
// Use non-blocking write with timeout
ctx, cancel := context.WithTimeout(context.Background(), writeTimeout)
@ -476,8 +637,8 @@ func (aic *AudioInputClient) writeMessage(msg *InputIPCMessage) error {
// Create a channel to signal write completion
done := make(chan error, 1)
go func() {
// Write header
_, err := aic.conn.Write(header)
// Write header using pre-allocated buffer
_, err := aic.conn.Write(optMsg.header[:])
if err != nil {
done <- err
return
@ -570,6 +731,20 @@ func (ais *AudioInputServer) startReaderGoroutine() {
func (ais *AudioInputServer) startProcessorGoroutine() {
ais.wg.Add(1)
go func() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Set high priority for audio processing
logger := logging.GetDefaultLogger().With().Str("component", "audio-input-processor").Logger()
if err := SetAudioThreadPriority(); err != nil {
logger.Warn().Err(err).Msg("Failed to set audio processing priority")
}
defer func() {
if err := ResetThreadPriority(); err != nil {
logger.Warn().Err(err).Msg("Failed to reset thread priority")
}
}()
defer ais.wg.Done()
for {
select {
@ -608,9 +783,27 @@ func (ais *AudioInputServer) startProcessorGoroutine() {
func (ais *AudioInputServer) startMonitorGoroutine() {
ais.wg.Add(1)
go func() {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Set I/O priority for monitoring
logger := logging.GetDefaultLogger().With().Str("component", "audio-input-monitor").Logger()
if err := SetAudioIOThreadPriority(); err != nil {
logger.Warn().Err(err).Msg("Failed to set audio I/O priority")
}
defer func() {
if err := ResetThreadPriority(); err != nil {
logger.Warn().Err(err).Msg("Failed to reset thread priority")
}
}()
defer ais.wg.Done()
ticker := time.NewTicker(100 * time.Millisecond)
defer ticker.Stop()
// Buffer size update ticker (less frequent)
bufferUpdateTicker := time.NewTicker(500 * time.Millisecond)
defer bufferUpdateTicker.Stop()
for {
select {
@ -623,52 +816,46 @@ func (ais *AudioInputServer) startMonitorGoroutine() {
case msg := <-ais.processChan:
start := time.Now()
err := ais.processMessage(msg)
processingTime := time.Since(start).Nanoseconds()
processingTime := time.Since(start)
// Calculate end-to-end latency using message timestamp
var latency time.Duration
if msg.Type == InputMessageTypeOpusFrame && msg.Timestamp > 0 {
msgTime := time.Unix(0, msg.Timestamp)
endToEndLatency := time.Since(msgTime).Nanoseconds()
latency = time.Since(msgTime)
// Use exponential moving average for end-to-end latency tracking
currentAvg := atomic.LoadInt64(&ais.processingTime)
// Weight: 90% historical, 10% current (for smoother averaging)
newAvg := (currentAvg*9 + endToEndLatency) / 10
newAvg := (currentAvg*9 + latency.Nanoseconds()) / 10
atomic.StoreInt64(&ais.processingTime, newAvg)
} else {
// Fallback to processing time only
latency = processingTime
currentAvg := atomic.LoadInt64(&ais.processingTime)
newAvg := (currentAvg + processingTime) / 2
newAvg := (currentAvg + processingTime.Nanoseconds()) / 2
atomic.StoreInt64(&ais.processingTime, newAvg)
}
// Report latency to adaptive buffer manager
ais.ReportLatency(latency)
if err != nil {
atomic.AddInt64(&ais.droppedFrames, 1)
}
default:
// No more messages to process
goto adaptiveBuffering
goto checkBufferUpdate
}
}
adaptiveBuffering:
// Adaptive buffer sizing based on processing time
avgTime := atomic.LoadInt64(&ais.processingTime)
currentSize := atomic.LoadInt64(&ais.bufferSize)
if avgTime > 10*1000*1000 { // > 10ms processing time
// Increase buffer size
newSize := currentSize * 2
if newSize > 1000 {
newSize = 1000
}
atomic.StoreInt64(&ais.bufferSize, newSize)
} else if avgTime < 1*1000*1000 { // < 1ms processing time
// Decrease buffer size
newSize := currentSize / 2
if newSize < 50 {
newSize = 50
}
atomic.StoreInt64(&ais.bufferSize, newSize)
checkBufferUpdate:
// Check if we need to update buffer size
select {
case <-bufferUpdateTicker.C:
// Update buffer size from adaptive buffer manager
ais.UpdateBufferSize()
default:
// No buffer update needed
}
}
}
@ -683,6 +870,64 @@ func (ais *AudioInputServer) GetServerStats() (total, dropped int64, avgProcessi
atomic.LoadInt64(&ais.bufferSize)
}
// UpdateBufferSize updates the buffer size from adaptive buffer manager
func (ais *AudioInputServer) UpdateBufferSize() {
adaptiveManager := GetAdaptiveBufferManager()
newSize := int64(adaptiveManager.GetInputBufferSize())
atomic.StoreInt64(&ais.bufferSize, newSize)
}
// ReportLatency reports processing latency to adaptive buffer manager
func (ais *AudioInputServer) ReportLatency(latency time.Duration) {
adaptiveManager := GetAdaptiveBufferManager()
adaptiveManager.UpdateLatency(latency)
}
// GetMessagePoolStats returns detailed statistics about the message pool
func (mp *MessagePool) GetMessagePoolStats() MessagePoolStats {
mp.mutex.RLock()
preallocatedCount := len(mp.preallocated)
mp.mutex.RUnlock()
hitCount := atomic.LoadInt64(&mp.hitCount)
missCount := atomic.LoadInt64(&mp.missCount)
totalRequests := hitCount + missCount
var hitRate float64
if totalRequests > 0 {
hitRate = float64(hitCount) / float64(totalRequests) * 100
}
// Calculate channel pool size
channelPoolSize := len(mp.pool)
return MessagePoolStats{
MaxPoolSize: mp.maxPoolSize,
ChannelPoolSize: channelPoolSize,
PreallocatedCount: int64(preallocatedCount),
PreallocatedMax: int64(mp.preallocSize),
HitCount: hitCount,
MissCount: missCount,
HitRate: hitRate,
}
}
// MessagePoolStats provides detailed message pool statistics
type MessagePoolStats struct {
MaxPoolSize int
ChannelPoolSize int
PreallocatedCount int64
PreallocatedMax int64
HitCount int64
MissCount int64
HitRate float64 // Percentage
}
// GetGlobalMessagePoolStats returns statistics for the global message pool
func GetGlobalMessagePoolStats() MessagePoolStats {
return globalMessagePool.GetMessagePoolStats()
}
// Helper functions
// getInputSocketPath returns the path to the input socket

View File

@ -116,6 +116,40 @@ func (aim *AudioInputIPCManager) WriteOpusFrame(frame []byte) error {
return nil
}
// WriteOpusFrameZeroCopy sends an Opus frame via IPC using zero-copy optimization
func (aim *AudioInputIPCManager) WriteOpusFrameZeroCopy(frame *ZeroCopyAudioFrame) error {
if atomic.LoadInt32(&aim.running) == 0 {
return nil // Not running, silently ignore
}
if frame == nil || frame.Length() == 0 {
return nil // Empty frame, ignore
}
// Start latency measurement
startTime := time.Now()
// Update metrics
atomic.AddInt64(&aim.metrics.FramesSent, 1)
atomic.AddInt64(&aim.metrics.BytesProcessed, int64(frame.Length()))
aim.metrics.LastFrameTime = startTime
// Send frame via IPC using zero-copy data
err := aim.supervisor.SendFrameZeroCopy(frame)
if err != nil {
// Count as dropped frame
atomic.AddInt64(&aim.metrics.FramesDropped, 1)
aim.logger.Debug().Err(err).Msg("Failed to send zero-copy frame via IPC")
return err
}
// Calculate and update latency (end-to-end IPC transmission time)
latency := time.Since(startTime)
aim.updateLatencyMetrics(latency)
return nil
}
// IsRunning returns whether the IPC manager is running
func (aim *AudioInputIPCManager) IsRunning() bool {
return atomic.LoadInt32(&aim.running) == 1

View File

@ -16,6 +16,10 @@ func RunAudioInputServer() error {
logger := logging.GetDefaultLogger().With().Str("component", "audio-input-server").Logger()
logger.Info().Msg("Starting audio input server subprocess")
// Start adaptive buffer management for optimal performance
StartAdaptiveBuffering()
defer StopAdaptiveBuffering()
// Initialize CGO audio system
err := CGOAudioPlaybackInit()
if err != nil {

View File

@ -244,6 +244,19 @@ func (ais *AudioInputSupervisor) SendFrame(frame []byte) error {
return ais.client.SendFrame(frame)
}
// SendFrameZeroCopy sends a zero-copy frame to the subprocess
func (ais *AudioInputSupervisor) SendFrameZeroCopy(frame *ZeroCopyAudioFrame) error {
if ais.client == nil {
return fmt.Errorf("client not initialized")
}
if !ais.client.IsConnected() {
return fmt.Errorf("client not connected")
}
return ais.client.SendFrameZeroCopy(frame)
}
// SendConfig sends a configuration update to the subprocess (convenience method)
func (ais *AudioInputSupervisor) SendConfig(config InputIPCConfig) error {
if ais.client == nil {

View File

@ -1,6 +1,7 @@
package audio
import (
"context"
"encoding/binary"
"fmt"
"io"
@ -8,22 +9,120 @@ import (
"os"
"path/filepath"
"sync"
"sync/atomic"
"time"
"github.com/rs/zerolog"
)
const (
magicNumber uint32 = 0x4A4B564D // "JKVM"
socketName = "audio_output.sock"
outputMagicNumber uint32 = 0x4A4B4F55 // "JKOU" (JetKVM Output)
outputSocketName = "audio_output.sock"
outputMaxFrameSize = 4096 // Maximum Opus frame size
outputWriteTimeout = 10 * time.Millisecond // Non-blocking write timeout (increased for high load)
outputMaxDroppedFrames = 50 // Maximum consecutive dropped frames
outputHeaderSize = 17 // Fixed header size: 4+1+4+8 bytes
outputMessagePoolSize = 128 // Pre-allocated message pool size
)
// OutputMessageType represents the type of IPC message
type OutputMessageType uint8
const (
OutputMessageTypeOpusFrame OutputMessageType = iota
OutputMessageTypeConfig
OutputMessageTypeStop
OutputMessageTypeHeartbeat
OutputMessageTypeAck
)
// OutputIPCMessage represents an IPC message for audio output
type OutputIPCMessage struct {
Magic uint32
Type OutputMessageType
Length uint32
Timestamp int64
Data []byte
}
// OutputOptimizedMessage represents a pre-allocated message for zero-allocation operations
type OutputOptimizedMessage struct {
header [outputHeaderSize]byte // Pre-allocated header buffer
data []byte // Reusable data buffer
}
// OutputMessagePool manages pre-allocated messages for zero-allocation IPC
type OutputMessagePool struct {
pool chan *OutputOptimizedMessage
}
// NewOutputMessagePool creates a new message pool
func NewOutputMessagePool(size int) *OutputMessagePool {
pool := &OutputMessagePool{
pool: make(chan *OutputOptimizedMessage, size),
}
// Pre-allocate messages
for i := 0; i < size; i++ {
msg := &OutputOptimizedMessage{
data: make([]byte, outputMaxFrameSize),
}
pool.pool <- msg
}
return pool
}
// Get retrieves a message from the pool
func (p *OutputMessagePool) Get() *OutputOptimizedMessage {
select {
case msg := <-p.pool:
return msg
default:
// Pool exhausted, create new message
return &OutputOptimizedMessage{
data: make([]byte, outputMaxFrameSize),
}
}
}
// Put returns a message to the pool
func (p *OutputMessagePool) Put(msg *OutputOptimizedMessage) {
select {
case p.pool <- msg:
// Successfully returned to pool
default:
// Pool full, let GC handle it
}
}
// Global message pool for output IPC
var globalOutputMessagePool = NewOutputMessagePool(outputMessagePoolSize)
type AudioServer struct {
// Atomic fields must be first for proper alignment on ARM
bufferSize int64 // Current buffer size (atomic)
processingTime int64 // Average processing time in nanoseconds (atomic)
droppedFrames int64 // Dropped frames counter (atomic)
totalFrames int64 // Total frames counter (atomic)
listener net.Listener
conn net.Conn
mtx sync.Mutex
running bool
// Advanced message handling
messageChan chan *OutputIPCMessage // Buffered channel for incoming messages
stopChan chan struct{} // Stop signal
wg sync.WaitGroup // Wait group for goroutine coordination
// Latency monitoring
latencyMonitor *LatencyMonitor
adaptiveOptimizer *AdaptiveOptimizer
}
func NewAudioServer() (*AudioServer, error) {
socketPath := filepath.Join("/var/run", socketName)
socketPath := getOutputSocketPath()
// Remove existing socket if any
os.Remove(socketPath)
@ -32,26 +131,175 @@ func NewAudioServer() (*AudioServer, error) {
return nil, fmt.Errorf("failed to create unix socket: %w", err)
}
return &AudioServer{listener: listener}, nil
// Initialize with adaptive buffer size (start with 500 frames)
initialBufferSize := int64(500)
// Initialize latency monitoring
latencyConfig := DefaultLatencyConfig()
logger := zerolog.New(os.Stderr).With().Timestamp().Str("component", "audio-server").Logger()
latencyMonitor := NewLatencyMonitor(latencyConfig, logger)
// Initialize adaptive buffer manager with default config
bufferConfig := DefaultAdaptiveBufferConfig()
bufferManager := NewAdaptiveBufferManager(bufferConfig)
// Initialize adaptive optimizer
optimizerConfig := DefaultOptimizerConfig()
adaptiveOptimizer := NewAdaptiveOptimizer(latencyMonitor, bufferManager, optimizerConfig, logger)
return &AudioServer{
listener: listener,
messageChan: make(chan *OutputIPCMessage, initialBufferSize),
stopChan: make(chan struct{}),
bufferSize: initialBufferSize,
latencyMonitor: latencyMonitor,
adaptiveOptimizer: adaptiveOptimizer,
}, nil
}
func (s *AudioServer) Start() error {
conn, err := s.listener.Accept()
if err != nil {
return fmt.Errorf("failed to accept connection: %w", err)
s.mtx.Lock()
defer s.mtx.Unlock()
if s.running {
return fmt.Errorf("server already running")
}
s.conn = conn
s.running = true
// Start latency monitoring and adaptive optimization
if s.latencyMonitor != nil {
s.latencyMonitor.Start()
}
if s.adaptiveOptimizer != nil {
s.adaptiveOptimizer.Start()
}
// Start message processor goroutine
s.startProcessorGoroutine()
// Accept connections in a goroutine
go s.acceptConnections()
return nil
}
func (s *AudioServer) Close() error {
// acceptConnections accepts incoming connections
func (s *AudioServer) acceptConnections() {
for s.running {
conn, err := s.listener.Accept()
if err != nil {
if s.running {
// Only log error if we're still supposed to be running
continue
}
return
}
s.mtx.Lock()
// Close existing connection if any
if s.conn != nil {
s.conn.Close()
}
s.conn = conn
s.mtx.Unlock()
}
}
// startProcessorGoroutine starts the message processor
func (s *AudioServer) startProcessorGoroutine() {
s.wg.Add(1)
go func() {
defer s.wg.Done()
for {
select {
case msg := <-s.messageChan:
// Process message (currently just frame sending)
if msg.Type == OutputMessageTypeOpusFrame {
s.sendFrameToClient(msg.Data)
}
case <-s.stopChan:
return
}
}
}()
}
func (s *AudioServer) Stop() {
s.mtx.Lock()
defer s.mtx.Unlock()
if !s.running {
return
}
s.running = false
// Stop latency monitoring and adaptive optimization
if s.adaptiveOptimizer != nil {
s.adaptiveOptimizer.Stop()
}
if s.latencyMonitor != nil {
s.latencyMonitor.Stop()
}
// Signal processor to stop
close(s.stopChan)
s.wg.Wait()
if s.conn != nil {
s.conn.Close()
s.conn = nil
}
return s.listener.Close()
}
func (s *AudioServer) Close() error {
s.Stop()
if s.listener != nil {
s.listener.Close()
}
// Remove socket file
os.Remove(getOutputSocketPath())
return nil
}
func (s *AudioServer) SendFrame(frame []byte) error {
if len(frame) > outputMaxFrameSize {
return fmt.Errorf("frame size %d exceeds maximum %d", len(frame), outputMaxFrameSize)
}
start := time.Now()
// Create IPC message
msg := &OutputIPCMessage{
Magic: outputMagicNumber,
Type: OutputMessageTypeOpusFrame,
Length: uint32(len(frame)),
Timestamp: start.UnixNano(),
Data: frame,
}
// Try to send via message channel (non-blocking)
select {
case s.messageChan <- msg:
atomic.AddInt64(&s.totalFrames, 1)
// Record latency for monitoring
if s.latencyMonitor != nil {
processingTime := time.Since(start)
s.latencyMonitor.RecordLatency(processingTime, "ipc_send")
}
return nil
default:
// Channel full, drop frame to prevent blocking
atomic.AddInt64(&s.droppedFrames, 1)
return fmt.Errorf("message channel full - frame dropped")
}
}
// sendFrameToClient sends frame data directly to the connected client
func (s *AudioServer) sendFrameToClient(frame []byte) error {
s.mtx.Lock()
defer s.mtx.Unlock()
@ -59,70 +307,199 @@ func (s *AudioServer) SendFrame(frame []byte) error {
return fmt.Errorf("no client connected")
}
// Write magic number
if err := binary.Write(s.conn, binary.BigEndian, magicNumber); err != nil {
return fmt.Errorf("failed to write magic number: %w", err)
}
start := time.Now()
// Write frame size
if err := binary.Write(s.conn, binary.BigEndian, uint32(len(frame))); err != nil {
return fmt.Errorf("failed to write frame size: %w", err)
}
// Get optimized message from pool
optMsg := globalOutputMessagePool.Get()
defer globalOutputMessagePool.Put(optMsg)
// Write frame data
if _, err := s.conn.Write(frame); err != nil {
return fmt.Errorf("failed to write frame data: %w", err)
}
// Prepare header in pre-allocated buffer
binary.LittleEndian.PutUint32(optMsg.header[0:4], outputMagicNumber)
optMsg.header[4] = byte(OutputMessageTypeOpusFrame)
binary.LittleEndian.PutUint32(optMsg.header[5:9], uint32(len(frame)))
binary.LittleEndian.PutUint64(optMsg.header[9:17], uint64(start.UnixNano()))
return nil
// Use non-blocking write with timeout
ctx, cancel := context.WithTimeout(context.Background(), outputWriteTimeout)
defer cancel()
// Create a channel to signal write completion
done := make(chan error, 1)
go func() {
// Write header using pre-allocated buffer
_, err := s.conn.Write(optMsg.header[:])
if err != nil {
done <- err
return
}
// Write frame data
if len(frame) > 0 {
_, err = s.conn.Write(frame)
if err != nil {
done <- err
return
}
}
done <- nil
}()
// Wait for completion or timeout
select {
case err := <-done:
if err != nil {
atomic.AddInt64(&s.droppedFrames, 1)
return err
}
// Record latency for monitoring
if s.latencyMonitor != nil {
writeLatency := time.Since(start)
s.latencyMonitor.RecordLatency(writeLatency, "ipc_write")
}
return nil
case <-ctx.Done():
// Timeout occurred - drop frame to prevent blocking
atomic.AddInt64(&s.droppedFrames, 1)
return fmt.Errorf("write timeout - frame dropped")
}
}
// GetServerStats returns server performance statistics
func (s *AudioServer) GetServerStats() (total, dropped int64, bufferSize int64) {
return atomic.LoadInt64(&s.totalFrames),
atomic.LoadInt64(&s.droppedFrames),
atomic.LoadInt64(&s.bufferSize)
}
type AudioClient struct {
conn net.Conn
mtx sync.Mutex
// Atomic fields must be first for proper alignment on ARM
droppedFrames int64 // Atomic counter for dropped frames
totalFrames int64 // Atomic counter for total frames
conn net.Conn
mtx sync.Mutex
running bool
}
func NewAudioClient() (*AudioClient, error) {
socketPath := filepath.Join("/var/run", socketName)
func NewAudioClient() *AudioClient {
return &AudioClient{}
}
// Connect connects to the audio output server
func (c *AudioClient) Connect() error {
c.mtx.Lock()
defer c.mtx.Unlock()
if c.running {
return nil // Already connected
}
socketPath := getOutputSocketPath()
// Try connecting multiple times as the server might not be ready
for i := 0; i < 5; i++ {
// Reduced retry count and delay for faster startup
for i := 0; i < 8; i++ {
conn, err := net.Dial("unix", socketPath)
if err == nil {
return &AudioClient{conn: conn}, nil
c.conn = conn
c.running = true
return nil
}
time.Sleep(time.Second)
// Exponential backoff starting at 50ms
delay := time.Duration(50*(1<<uint(i/3))) * time.Millisecond
if delay > 400*time.Millisecond {
delay = 400 * time.Millisecond
}
time.Sleep(delay)
}
return nil, fmt.Errorf("failed to connect to audio server")
return fmt.Errorf("failed to connect to audio output server")
}
// Disconnect disconnects from the audio output server
func (c *AudioClient) Disconnect() {
c.mtx.Lock()
defer c.mtx.Unlock()
if !c.running {
return
}
c.running = false
if c.conn != nil {
c.conn.Close()
c.conn = nil
}
}
// IsConnected returns whether the client is connected
func (c *AudioClient) IsConnected() bool {
c.mtx.Lock()
defer c.mtx.Unlock()
return c.running && c.conn != nil
}
func (c *AudioClient) Close() error {
return c.conn.Close()
c.Disconnect()
return nil
}
func (c *AudioClient) ReceiveFrame() ([]byte, error) {
c.mtx.Lock()
defer c.mtx.Unlock()
// Read magic number
var magic uint32
if err := binary.Read(c.conn, binary.BigEndian, &magic); err != nil {
return nil, fmt.Errorf("failed to read magic number: %w", err)
if !c.running || c.conn == nil {
return nil, fmt.Errorf("not connected")
}
if magic != magicNumber {
// Get optimized message from pool for header reading
optMsg := globalOutputMessagePool.Get()
defer globalOutputMessagePool.Put(optMsg)
// Read header
if _, err := io.ReadFull(c.conn, optMsg.header[:]); err != nil {
return nil, fmt.Errorf("failed to read header: %w", err)
}
// Parse header
magic := binary.LittleEndian.Uint32(optMsg.header[0:4])
if magic != outputMagicNumber {
return nil, fmt.Errorf("invalid magic number: %x", magic)
}
// Read frame size
var size uint32
if err := binary.Read(c.conn, binary.BigEndian, &size); err != nil {
return nil, fmt.Errorf("failed to read frame size: %w", err)
msgType := OutputMessageType(optMsg.header[4])
if msgType != OutputMessageTypeOpusFrame {
return nil, fmt.Errorf("unexpected message type: %d", msgType)
}
size := binary.LittleEndian.Uint32(optMsg.header[5:9])
if size > outputMaxFrameSize {
return nil, fmt.Errorf("frame size %d exceeds maximum %d", size, outputMaxFrameSize)
}
// Read frame data
frame := make([]byte, size)
if _, err := io.ReadFull(c.conn, frame); err != nil {
return nil, fmt.Errorf("failed to read frame data: %w", err)
if size > 0 {
if _, err := io.ReadFull(c.conn, frame); err != nil {
return nil, fmt.Errorf("failed to read frame data: %w", err)
}
}
atomic.AddInt64(&c.totalFrames, 1)
return frame, nil
}
// GetClientStats returns client performance statistics
func (c *AudioClient) GetClientStats() (total, dropped int64) {
return atomic.LoadInt64(&c.totalFrames),
atomic.LoadInt64(&c.droppedFrames)
}
// Helper functions
// getOutputSocketPath returns the path to the output socket
func getOutputSocketPath() string {
if path := os.Getenv("JETKVM_AUDIO_OUTPUT_SOCKET"); path != "" {
return path
}
return filepath.Join("/var/run", outputSocketName)
}

View File

@ -0,0 +1,312 @@
package audio
import (
"context"
"sync"
"sync/atomic"
"time"
"github.com/rs/zerolog"
)
// LatencyMonitor tracks and optimizes audio latency in real-time
type LatencyMonitor struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
currentLatency int64 // Current latency in nanoseconds (atomic)
averageLatency int64 // Rolling average latency in nanoseconds (atomic)
minLatency int64 // Minimum observed latency in nanoseconds (atomic)
maxLatency int64 // Maximum observed latency in nanoseconds (atomic)
latencySamples int64 // Number of latency samples collected (atomic)
jitterAccumulator int64 // Accumulated jitter for variance calculation (atomic)
lastOptimization int64 // Timestamp of last optimization in nanoseconds (atomic)
config LatencyConfig
logger zerolog.Logger
// Control channels
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
// Optimization callbacks
optimizationCallbacks []OptimizationCallback
mutex sync.RWMutex
// Performance tracking
latencyHistory []LatencyMeasurement
historyMutex sync.RWMutex
}
// LatencyConfig holds configuration for latency monitoring
type LatencyConfig struct {
TargetLatency time.Duration // Target latency to maintain
MaxLatency time.Duration // Maximum acceptable latency
OptimizationInterval time.Duration // How often to run optimization
HistorySize int // Number of latency measurements to keep
JitterThreshold time.Duration // Jitter threshold for optimization
AdaptiveThreshold float64 // Threshold for adaptive adjustments (0.0-1.0)
}
// LatencyMeasurement represents a single latency measurement
type LatencyMeasurement struct {
Timestamp time.Time
Latency time.Duration
Jitter time.Duration
Source string // Source of the measurement (e.g., "input", "output", "processing")
}
// OptimizationCallback is called when latency optimization is triggered
type OptimizationCallback func(metrics LatencyMetrics) error
// LatencyMetrics provides comprehensive latency statistics
type LatencyMetrics struct {
Current time.Duration
Average time.Duration
Min time.Duration
Max time.Duration
Jitter time.Duration
SampleCount int64
Trend LatencyTrend
}
// LatencyTrend indicates the direction of latency changes
type LatencyTrend int
const (
LatencyTrendStable LatencyTrend = iota
LatencyTrendIncreasing
LatencyTrendDecreasing
LatencyTrendVolatile
)
// DefaultLatencyConfig returns a sensible default configuration
func DefaultLatencyConfig() LatencyConfig {
return LatencyConfig{
TargetLatency: 50 * time.Millisecond,
MaxLatency: 200 * time.Millisecond,
OptimizationInterval: 5 * time.Second,
HistorySize: 100,
JitterThreshold: 20 * time.Millisecond,
AdaptiveThreshold: 0.8, // Trigger optimization when 80% above target
}
}
// NewLatencyMonitor creates a new latency monitoring system
func NewLatencyMonitor(config LatencyConfig, logger zerolog.Logger) *LatencyMonitor {
ctx, cancel := context.WithCancel(context.Background())
return &LatencyMonitor{
config: config,
logger: logger.With().Str("component", "latency-monitor").Logger(),
ctx: ctx,
cancel: cancel,
latencyHistory: make([]LatencyMeasurement, 0, config.HistorySize),
minLatency: int64(time.Hour), // Initialize to high value
}
}
// Start begins latency monitoring and optimization
func (lm *LatencyMonitor) Start() {
lm.wg.Add(1)
go lm.monitoringLoop()
lm.logger.Info().Msg("Latency monitor started")
}
// Stop stops the latency monitor
func (lm *LatencyMonitor) Stop() {
lm.cancel()
lm.wg.Wait()
lm.logger.Info().Msg("Latency monitor stopped")
}
// RecordLatency records a new latency measurement
func (lm *LatencyMonitor) RecordLatency(latency time.Duration, source string) {
now := time.Now()
latencyNanos := latency.Nanoseconds()
// Update atomic counters
atomic.StoreInt64(&lm.currentLatency, latencyNanos)
atomic.AddInt64(&lm.latencySamples, 1)
// Update min/max
for {
oldMin := atomic.LoadInt64(&lm.minLatency)
if latencyNanos >= oldMin || atomic.CompareAndSwapInt64(&lm.minLatency, oldMin, latencyNanos) {
break
}
}
for {
oldMax := atomic.LoadInt64(&lm.maxLatency)
if latencyNanos <= oldMax || atomic.CompareAndSwapInt64(&lm.maxLatency, oldMax, latencyNanos) {
break
}
}
// Update rolling average using exponential moving average
oldAvg := atomic.LoadInt64(&lm.averageLatency)
newAvg := oldAvg + (latencyNanos-oldAvg)/10 // Alpha = 0.1
atomic.StoreInt64(&lm.averageLatency, newAvg)
// Calculate jitter (difference from average)
jitter := latencyNanos - newAvg
if jitter < 0 {
jitter = -jitter
}
atomic.AddInt64(&lm.jitterAccumulator, jitter)
// Store in history
lm.historyMutex.Lock()
measurement := LatencyMeasurement{
Timestamp: now,
Latency: latency,
Jitter: time.Duration(jitter),
Source: source,
}
if len(lm.latencyHistory) >= lm.config.HistorySize {
// Remove oldest measurement
copy(lm.latencyHistory, lm.latencyHistory[1:])
lm.latencyHistory[len(lm.latencyHistory)-1] = measurement
} else {
lm.latencyHistory = append(lm.latencyHistory, measurement)
}
lm.historyMutex.Unlock()
}
// GetMetrics returns current latency metrics
func (lm *LatencyMonitor) GetMetrics() LatencyMetrics {
current := atomic.LoadInt64(&lm.currentLatency)
average := atomic.LoadInt64(&lm.averageLatency)
min := atomic.LoadInt64(&lm.minLatency)
max := atomic.LoadInt64(&lm.maxLatency)
samples := atomic.LoadInt64(&lm.latencySamples)
jitterSum := atomic.LoadInt64(&lm.jitterAccumulator)
var jitter time.Duration
if samples > 0 {
jitter = time.Duration(jitterSum / samples)
}
return LatencyMetrics{
Current: time.Duration(current),
Average: time.Duration(average),
Min: time.Duration(min),
Max: time.Duration(max),
Jitter: jitter,
SampleCount: samples,
Trend: lm.calculateTrend(),
}
}
// AddOptimizationCallback adds a callback for latency optimization
func (lm *LatencyMonitor) AddOptimizationCallback(callback OptimizationCallback) {
lm.mutex.Lock()
lm.optimizationCallbacks = append(lm.optimizationCallbacks, callback)
lm.mutex.Unlock()
}
// monitoringLoop runs the main monitoring and optimization loop
func (lm *LatencyMonitor) monitoringLoop() {
defer lm.wg.Done()
ticker := time.NewTicker(lm.config.OptimizationInterval)
defer ticker.Stop()
for {
select {
case <-lm.ctx.Done():
return
case <-ticker.C:
lm.runOptimization()
}
}
}
// runOptimization checks if optimization is needed and triggers callbacks
func (lm *LatencyMonitor) runOptimization() {
metrics := lm.GetMetrics()
// Check if optimization is needed
needsOptimization := false
// Check if current latency exceeds threshold
if metrics.Current > lm.config.MaxLatency {
needsOptimization = true
lm.logger.Warn().Dur("current_latency", metrics.Current).Dur("max_latency", lm.config.MaxLatency).Msg("Latency exceeds maximum threshold")
}
// Check if average latency is above adaptive threshold
adaptiveThreshold := time.Duration(float64(lm.config.TargetLatency.Nanoseconds()) * (1.0 + lm.config.AdaptiveThreshold))
if metrics.Average > adaptiveThreshold {
needsOptimization = true
lm.logger.Info().Dur("average_latency", metrics.Average).Dur("threshold", adaptiveThreshold).Msg("Average latency above adaptive threshold")
}
// Check if jitter is too high
if metrics.Jitter > lm.config.JitterThreshold {
needsOptimization = true
lm.logger.Info().Dur("jitter", metrics.Jitter).Dur("threshold", lm.config.JitterThreshold).Msg("Jitter above threshold")
}
if needsOptimization {
atomic.StoreInt64(&lm.lastOptimization, time.Now().UnixNano())
// Run optimization callbacks
lm.mutex.RLock()
callbacks := make([]OptimizationCallback, len(lm.optimizationCallbacks))
copy(callbacks, lm.optimizationCallbacks)
lm.mutex.RUnlock()
for _, callback := range callbacks {
if err := callback(metrics); err != nil {
lm.logger.Error().Err(err).Msg("Optimization callback failed")
}
}
lm.logger.Info().Interface("metrics", metrics).Msg("Latency optimization triggered")
}
}
// calculateTrend analyzes recent latency measurements to determine trend
func (lm *LatencyMonitor) calculateTrend() LatencyTrend {
lm.historyMutex.RLock()
defer lm.historyMutex.RUnlock()
if len(lm.latencyHistory) < 10 {
return LatencyTrendStable
}
// Analyze last 10 measurements
recentMeasurements := lm.latencyHistory[len(lm.latencyHistory)-10:]
var increasing, decreasing int
for i := 1; i < len(recentMeasurements); i++ {
if recentMeasurements[i].Latency > recentMeasurements[i-1].Latency {
increasing++
} else if recentMeasurements[i].Latency < recentMeasurements[i-1].Latency {
decreasing++
}
}
// Determine trend based on direction changes
if increasing > 6 {
return LatencyTrendIncreasing
} else if decreasing > 6 {
return LatencyTrendDecreasing
} else if increasing+decreasing > 7 {
return LatencyTrendVolatile
}
return LatencyTrendStable
}
// GetLatencyHistory returns a copy of recent latency measurements
func (lm *LatencyMonitor) GetLatencyHistory() []LatencyMeasurement {
lm.historyMutex.RLock()
defer lm.historyMutex.RUnlock()
history := make([]LatencyMeasurement, len(lm.latencyHistory))
copy(history, lm.latencyHistory)
return history
}

View File

@ -0,0 +1,198 @@
package audio
import (
"encoding/json"
"net/http"
"runtime"
"time"
"github.com/jetkvm/kvm/internal/logging"
"github.com/rs/zerolog"
)
// MemoryMetrics provides comprehensive memory allocation statistics
type MemoryMetrics struct {
// Runtime memory statistics
RuntimeStats RuntimeMemoryStats `json:"runtime_stats"`
// Audio buffer pool statistics
BufferPools AudioBufferPoolStats `json:"buffer_pools"`
// Zero-copy frame pool statistics
ZeroCopyPool ZeroCopyFramePoolStats `json:"zero_copy_pool"`
// Message pool statistics
MessagePool MessagePoolStats `json:"message_pool"`
// Batch processor statistics
BatchProcessor BatchProcessorMemoryStats `json:"batch_processor,omitempty"`
// Collection timestamp
Timestamp time.Time `json:"timestamp"`
}
// RuntimeMemoryStats provides Go runtime memory statistics
type RuntimeMemoryStats struct {
Alloc uint64 `json:"alloc"` // Bytes allocated and not yet freed
TotalAlloc uint64 `json:"total_alloc"` // Total bytes allocated (cumulative)
Sys uint64 `json:"sys"` // Total bytes obtained from OS
Lookups uint64 `json:"lookups"` // Number of pointer lookups
Mallocs uint64 `json:"mallocs"` // Number of mallocs
Frees uint64 `json:"frees"` // Number of frees
HeapAlloc uint64 `json:"heap_alloc"` // Bytes allocated and not yet freed (heap)
HeapSys uint64 `json:"heap_sys"` // Bytes obtained from OS for heap
HeapIdle uint64 `json:"heap_idle"` // Bytes in idle spans
HeapInuse uint64 `json:"heap_inuse"` // Bytes in non-idle spans
HeapReleased uint64 `json:"heap_released"` // Bytes released to OS
HeapObjects uint64 `json:"heap_objects"` // Total number of allocated objects
StackInuse uint64 `json:"stack_inuse"` // Bytes used by stack spans
StackSys uint64 `json:"stack_sys"` // Bytes obtained from OS for stack
MSpanInuse uint64 `json:"mspan_inuse"` // Bytes used by mspan structures
MSpanSys uint64 `json:"mspan_sys"` // Bytes obtained from OS for mspan
MCacheInuse uint64 `json:"mcache_inuse"` // Bytes used by mcache structures
MCacheSys uint64 `json:"mcache_sys"` // Bytes obtained from OS for mcache
BuckHashSys uint64 `json:"buck_hash_sys"` // Bytes used by profiling bucket hash table
GCSys uint64 `json:"gc_sys"` // Bytes used for garbage collection metadata
OtherSys uint64 `json:"other_sys"` // Bytes used for other system allocations
NextGC uint64 `json:"next_gc"` // Target heap size for next GC
LastGC uint64 `json:"last_gc"` // Time of last GC (nanoseconds since epoch)
PauseTotalNs uint64 `json:"pause_total_ns"` // Total GC pause time
NumGC uint32 `json:"num_gc"` // Number of completed GC cycles
NumForcedGC uint32 `json:"num_forced_gc"` // Number of forced GC cycles
GCCPUFraction float64 `json:"gc_cpu_fraction"` // Fraction of CPU time used by GC
}
// BatchProcessorMemoryStats provides batch processor memory statistics
type BatchProcessorMemoryStats struct {
Initialized bool `json:"initialized"`
Running bool `json:"running"`
Stats BatchAudioStats `json:"stats"`
BufferPool AudioBufferPoolDetailedStats `json:"buffer_pool,omitempty"`
}
// GetBatchAudioProcessor is defined in batch_audio.go
// BatchAudioStats is defined in batch_audio.go
var memoryMetricsLogger *zerolog.Logger
func getMemoryMetricsLogger() *zerolog.Logger {
if memoryMetricsLogger == nil {
logger := logging.GetDefaultLogger().With().Str("component", "memory-metrics").Logger()
memoryMetricsLogger = &logger
}
return memoryMetricsLogger
}
// CollectMemoryMetrics gathers comprehensive memory allocation statistics
func CollectMemoryMetrics() MemoryMetrics {
// Collect runtime memory statistics
var m runtime.MemStats
runtime.ReadMemStats(&m)
runtimeStats := RuntimeMemoryStats{
Alloc: m.Alloc,
TotalAlloc: m.TotalAlloc,
Sys: m.Sys,
Lookups: m.Lookups,
Mallocs: m.Mallocs,
Frees: m.Frees,
HeapAlloc: m.HeapAlloc,
HeapSys: m.HeapSys,
HeapIdle: m.HeapIdle,
HeapInuse: m.HeapInuse,
HeapReleased: m.HeapReleased,
HeapObjects: m.HeapObjects,
StackInuse: m.StackInuse,
StackSys: m.StackSys,
MSpanInuse: m.MSpanInuse,
MSpanSys: m.MSpanSys,
MCacheInuse: m.MCacheInuse,
MCacheSys: m.MCacheSys,
BuckHashSys: m.BuckHashSys,
GCSys: m.GCSys,
OtherSys: m.OtherSys,
NextGC: m.NextGC,
LastGC: m.LastGC,
PauseTotalNs: m.PauseTotalNs,
NumGC: m.NumGC,
NumForcedGC: m.NumForcedGC,
GCCPUFraction: m.GCCPUFraction,
}
// Collect audio buffer pool statistics
bufferPoolStats := GetAudioBufferPoolStats()
// Collect zero-copy frame pool statistics
zeroCopyStats := GetGlobalZeroCopyPoolStats()
// Collect message pool statistics
messagePoolStats := GetGlobalMessagePoolStats()
// Collect batch processor statistics if available
var batchStats BatchProcessorMemoryStats
if processor := GetBatchAudioProcessor(); processor != nil {
batchStats.Initialized = true
batchStats.Running = processor.IsRunning()
batchStats.Stats = processor.GetStats()
// Note: BatchAudioProcessor uses sync.Pool, detailed stats not available
}
return MemoryMetrics{
RuntimeStats: runtimeStats,
BufferPools: bufferPoolStats,
ZeroCopyPool: zeroCopyStats,
MessagePool: messagePoolStats,
BatchProcessor: batchStats,
Timestamp: time.Now(),
}
}
// HandleMemoryMetrics provides an HTTP handler for memory metrics
func HandleMemoryMetrics(w http.ResponseWriter, r *http.Request) {
logger := getMemoryMetricsLogger()
if r.Method != http.MethodGet {
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
return
}
metrics := CollectMemoryMetrics()
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Cache-Control", "no-cache")
if err := json.NewEncoder(w).Encode(metrics); err != nil {
logger.Error().Err(err).Msg("failed to encode memory metrics")
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
logger.Debug().Msg("memory metrics served")
}
// LogMemoryMetrics logs current memory metrics for debugging
func LogMemoryMetrics() {
logger := getMemoryMetricsLogger()
metrics := CollectMemoryMetrics()
logger.Info().
Uint64("heap_alloc_mb", metrics.RuntimeStats.HeapAlloc/1024/1024).
Uint64("heap_sys_mb", metrics.RuntimeStats.HeapSys/1024/1024).
Uint64("heap_objects", metrics.RuntimeStats.HeapObjects).
Uint32("num_gc", metrics.RuntimeStats.NumGC).
Float64("gc_cpu_fraction", metrics.RuntimeStats.GCCPUFraction).
Float64("buffer_pool_hit_rate", metrics.BufferPools.FramePoolHitRate).
Float64("zero_copy_hit_rate", metrics.ZeroCopyPool.HitRate).
Float64("message_pool_hit_rate", metrics.MessagePool.HitRate).
Msg("memory metrics snapshot")
}
// StartMemoryMetricsLogging starts periodic memory metrics logging
func StartMemoryMetricsLogging(interval time.Duration) {
logger := getMemoryMetricsLogger()
logger.Info().Dur("interval", interval).Msg("starting memory metrics logging")
go func() {
ticker := time.NewTicker(interval)
defer ticker.Stop()
for range ticker.C {
LogMemoryMetrics()
}
}()
}

View File

@ -10,6 +10,42 @@ import (
)
var (
// Adaptive buffer metrics
adaptiveInputBufferSize = promauto.NewGauge(
prometheus.GaugeOpts{
Name: "jetkvm_adaptive_input_buffer_size_bytes",
Help: "Current adaptive input buffer size in bytes",
},
)
adaptiveOutputBufferSize = promauto.NewGauge(
prometheus.GaugeOpts{
Name: "jetkvm_adaptive_output_buffer_size_bytes",
Help: "Current adaptive output buffer size in bytes",
},
)
adaptiveBufferAdjustmentsTotal = promauto.NewCounter(
prometheus.CounterOpts{
Name: "jetkvm_adaptive_buffer_adjustments_total",
Help: "Total number of adaptive buffer size adjustments",
},
)
adaptiveSystemCpuPercent = promauto.NewGauge(
prometheus.GaugeOpts{
Name: "jetkvm_adaptive_system_cpu_percent",
Help: "System CPU usage percentage used by adaptive buffer manager",
},
)
adaptiveSystemMemoryPercent = promauto.NewGauge(
prometheus.GaugeOpts{
Name: "jetkvm_adaptive_system_memory_percent",
Help: "System memory usage percentage used by adaptive buffer manager",
},
)
// Audio output metrics
audioFramesReceivedTotal = promauto.NewCounter(
prometheus.CounterOpts{
@ -364,6 +400,23 @@ func UpdateMicrophoneConfigMetrics(config AudioConfig) {
atomic.StoreInt64(&lastMetricsUpdate, time.Now().Unix())
}
// UpdateAdaptiveBufferMetrics updates Prometheus metrics with adaptive buffer information
func UpdateAdaptiveBufferMetrics(inputBufferSize, outputBufferSize int, cpuPercent, memoryPercent float64, adjustmentMade bool) {
metricsUpdateMutex.Lock()
defer metricsUpdateMutex.Unlock()
adaptiveInputBufferSize.Set(float64(inputBufferSize))
adaptiveOutputBufferSize.Set(float64(outputBufferSize))
adaptiveSystemCpuPercent.Set(cpuPercent)
adaptiveSystemMemoryPercent.Set(memoryPercent)
if adjustmentMade {
adaptiveBufferAdjustmentsTotal.Inc()
}
atomic.StoreInt64(&lastMetricsUpdate, time.Now().Unix())
}
// GetLastMetricsUpdate returns the timestamp of the last metrics update
func GetLastMetricsUpdate() time.Time {
timestamp := atomic.LoadInt64(&lastMetricsUpdate)

View File

@ -8,9 +8,11 @@ import (
// MicrophoneContentionManager manages microphone access with cooldown periods
type MicrophoneContentionManager struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
lastOpNano int64
cooldownNanos int64
operationID int64
lockPtr unsafe.Pointer
}

View File

@ -2,6 +2,9 @@ package audio
import (
"context"
"fmt"
"runtime"
"sync"
"sync/atomic"
"time"
@ -9,6 +12,28 @@ import (
"github.com/rs/zerolog"
)
// OutputStreamer manages high-performance audio output streaming
type OutputStreamer struct {
// Atomic fields must be first for proper alignment on ARM
processedFrames int64 // Total processed frames counter (atomic)
droppedFrames int64 // Dropped frames counter (atomic)
processingTime int64 // Average processing time in nanoseconds (atomic)
lastStatsTime int64 // Last statistics update time (atomic)
client *AudioClient
bufferPool *AudioBufferPool
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
running bool
mtx sync.Mutex
// Performance optimization fields
batchSize int // Adaptive batch size for frame processing
processingChan chan []byte // Buffered channel for frame processing
statsInterval time.Duration // Statistics reporting interval
}
var (
outputStreamingRunning int32
outputStreamingCancel context.CancelFunc
@ -23,6 +48,253 @@ func getOutputStreamingLogger() *zerolog.Logger {
return outputStreamingLogger
}
func NewOutputStreamer() (*OutputStreamer, error) {
client := NewAudioClient()
// Get initial batch size from adaptive buffer manager
adaptiveManager := GetAdaptiveBufferManager()
initialBatchSize := adaptiveManager.GetOutputBufferSize()
ctx, cancel := context.WithCancel(context.Background())
return &OutputStreamer{
client: client,
bufferPool: NewAudioBufferPool(MaxAudioFrameSize), // Use existing buffer pool
ctx: ctx,
cancel: cancel,
batchSize: initialBatchSize, // Use adaptive batch size
processingChan: make(chan []byte, 500), // Large buffer for smooth processing
statsInterval: 5 * time.Second, // Statistics every 5 seconds
lastStatsTime: time.Now().UnixNano(),
}, nil
}
func (s *OutputStreamer) Start() error {
s.mtx.Lock()
defer s.mtx.Unlock()
if s.running {
return fmt.Errorf("output streamer already running")
}
// Connect to audio output server
if err := s.client.Connect(); err != nil {
return fmt.Errorf("failed to connect to audio output server: %w", err)
}
s.running = true
// Start multiple goroutines for optimal performance
s.wg.Add(3)
go s.streamLoop() // Main streaming loop
go s.processingLoop() // Frame processing loop
go s.statisticsLoop() // Performance monitoring loop
return nil
}
func (s *OutputStreamer) Stop() {
s.mtx.Lock()
defer s.mtx.Unlock()
if !s.running {
return
}
s.running = false
s.cancel()
// Close processing channel to signal goroutines
close(s.processingChan)
// Wait for all goroutines to finish
s.wg.Wait()
if s.client != nil {
s.client.Close()
}
}
func (s *OutputStreamer) streamLoop() {
defer s.wg.Done()
// Pin goroutine to OS thread for consistent performance
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Adaptive timing for frame reading
frameInterval := time.Duration(20) * time.Millisecond // 50 FPS base rate
ticker := time.NewTicker(frameInterval)
defer ticker.Stop()
// Batch size update ticker
batchUpdateTicker := time.NewTicker(500 * time.Millisecond)
defer batchUpdateTicker.Stop()
for {
select {
case <-s.ctx.Done():
return
case <-batchUpdateTicker.C:
// Update batch size from adaptive buffer manager
s.UpdateBatchSize()
case <-ticker.C:
// Read audio data from CGO with timing measurement
startTime := time.Now()
frameBuf := s.bufferPool.Get()
n, err := CGOAudioReadEncode(frameBuf)
processingDuration := time.Since(startTime)
if err != nil {
getOutputStreamingLogger().Warn().Err(err).Msg("Failed to read audio data")
s.bufferPool.Put(frameBuf)
atomic.AddInt64(&s.droppedFrames, 1)
continue
}
if n > 0 {
// Send frame for processing (non-blocking)
frameData := make([]byte, n)
copy(frameData, frameBuf[:n])
select {
case s.processingChan <- frameData:
atomic.AddInt64(&s.processedFrames, 1)
// Update processing time statistics
atomic.StoreInt64(&s.processingTime, int64(processingDuration))
// Report latency to adaptive buffer manager
s.ReportLatency(processingDuration)
default:
// Processing channel full, drop frame
atomic.AddInt64(&s.droppedFrames, 1)
}
}
s.bufferPool.Put(frameBuf)
}
}
}
// processingLoop handles frame processing in a separate goroutine
func (s *OutputStreamer) processingLoop() {
defer s.wg.Done()
// Pin goroutine to OS thread for consistent performance
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Set high priority for audio output processing
if err := SetAudioThreadPriority(); err != nil {
getOutputStreamingLogger().Warn().Err(err).Msg("Failed to set audio output processing priority")
}
defer func() {
if err := ResetThreadPriority(); err != nil {
getOutputStreamingLogger().Warn().Err(err).Msg("Failed to reset thread priority")
}
}()
for _ = range s.processingChan {
// Process frame (currently just receiving, but can be extended)
if _, err := s.client.ReceiveFrame(); err != nil {
if s.client.IsConnected() {
getOutputStreamingLogger().Warn().Err(err).Msg("Failed to receive frame")
atomic.AddInt64(&s.droppedFrames, 1)
}
// Try to reconnect if disconnected
if !s.client.IsConnected() {
if err := s.client.Connect(); err != nil {
getOutputStreamingLogger().Warn().Err(err).Msg("Failed to reconnect")
}
}
}
}
}
// statisticsLoop monitors and reports performance statistics
func (s *OutputStreamer) statisticsLoop() {
defer s.wg.Done()
ticker := time.NewTicker(s.statsInterval)
defer ticker.Stop()
for {
select {
case <-s.ctx.Done():
return
case <-ticker.C:
s.reportStatistics()
}
}
}
// reportStatistics logs current performance statistics
func (s *OutputStreamer) reportStatistics() {
processed := atomic.LoadInt64(&s.processedFrames)
dropped := atomic.LoadInt64(&s.droppedFrames)
processingTime := atomic.LoadInt64(&s.processingTime)
if processed > 0 {
dropRate := float64(dropped) / float64(processed+dropped) * 100
avgProcessingTime := time.Duration(processingTime)
getOutputStreamingLogger().Info().Int64("processed", processed).Int64("dropped", dropped).Float64("drop_rate", dropRate).Dur("avg_processing", avgProcessingTime).Msg("Output Audio Stats")
// Get client statistics
clientTotal, clientDropped := s.client.GetClientStats()
getOutputStreamingLogger().Info().Int64("total", clientTotal).Int64("dropped", clientDropped).Msg("Client Stats")
}
}
// GetStats returns streaming statistics
func (s *OutputStreamer) GetStats() (processed, dropped int64, avgProcessingTime time.Duration) {
processed = atomic.LoadInt64(&s.processedFrames)
dropped = atomic.LoadInt64(&s.droppedFrames)
processingTimeNs := atomic.LoadInt64(&s.processingTime)
avgProcessingTime = time.Duration(processingTimeNs)
return
}
// GetDetailedStats returns comprehensive streaming statistics
func (s *OutputStreamer) GetDetailedStats() map[string]interface{} {
processed := atomic.LoadInt64(&s.processedFrames)
dropped := atomic.LoadInt64(&s.droppedFrames)
processingTime := atomic.LoadInt64(&s.processingTime)
stats := map[string]interface{}{
"processed_frames": processed,
"dropped_frames": dropped,
"avg_processing_time_ns": processingTime,
"batch_size": s.batchSize,
"channel_buffer_size": cap(s.processingChan),
"channel_current_size": len(s.processingChan),
"connected": s.client.IsConnected(),
}
if processed+dropped > 0 {
stats["drop_rate_percent"] = float64(dropped) / float64(processed+dropped) * 100
}
// Add client statistics
clientTotal, clientDropped := s.client.GetClientStats()
stats["client_total_frames"] = clientTotal
stats["client_dropped_frames"] = clientDropped
return stats
}
// UpdateBatchSize updates the batch size from adaptive buffer manager
func (s *OutputStreamer) UpdateBatchSize() {
s.mtx.Lock()
adaptiveManager := GetAdaptiveBufferManager()
s.batchSize = adaptiveManager.GetOutputBufferSize()
s.mtx.Unlock()
}
// ReportLatency reports processing latency to adaptive buffer manager
func (s *OutputStreamer) ReportLatency(latency time.Duration) {
adaptiveManager := GetAdaptiveBufferManager()
adaptiveManager.UpdateLatency(latency)
}
// StartAudioOutputStreaming starts audio output streaming (capturing system audio)
func StartAudioOutputStreaming(send func([]byte)) error {
if !atomic.CompareAndSwapInt32(&outputStreamingRunning, 0, 1) {
@ -61,10 +333,13 @@ func StartAudioOutputStreaming(send func([]byte)) error {
continue
}
if n > 0 {
// Send frame to callback
frame := make([]byte, n)
// Get frame buffer from pool to reduce allocations
frame := GetAudioFrameBuffer()
frame = frame[:n] // Resize to actual frame size
copy(frame, buffer[:n])
send(frame)
// Return buffer to pool after sending
PutAudioFrameBuffer(frame)
RecordFrameReceived(n)
}
// Small delay to prevent busy waiting

View File

@ -0,0 +1,165 @@
//go:build linux
package audio
import (
"runtime"
"syscall"
"unsafe"
"github.com/jetkvm/kvm/internal/logging"
"github.com/rs/zerolog"
)
// SchedParam represents scheduling parameters for Linux
type SchedParam struct {
Priority int32
}
// Priority levels for audio processing
const (
// SCHED_FIFO priorities (1-99, higher = more priority)
AudioHighPriority = 80 // High priority for critical audio processing
AudioMediumPriority = 60 // Medium priority for regular audio processing
AudioLowPriority = 40 // Low priority for background audio tasks
// SCHED_NORMAL is the default (priority 0)
NormalPriority = 0
)
// Scheduling policies
const (
SCHED_NORMAL = 0
SCHED_FIFO = 1
SCHED_RR = 2
)
// PriorityScheduler manages thread priorities for audio processing
type PriorityScheduler struct {
logger zerolog.Logger
enabled bool
}
// NewPriorityScheduler creates a new priority scheduler
func NewPriorityScheduler() *PriorityScheduler {
return &PriorityScheduler{
logger: logging.GetDefaultLogger().With().Str("component", "priority-scheduler").Logger(),
enabled: true,
}
}
// SetThreadPriority sets the priority of the current thread
func (ps *PriorityScheduler) SetThreadPriority(priority int, policy int) error {
if !ps.enabled {
return nil
}
// Lock to OS thread to ensure we're setting priority for the right thread
runtime.LockOSThread()
// Get current thread ID
tid := syscall.Gettid()
// Set scheduling parameters
param := &SchedParam{
Priority: int32(priority),
}
// Use syscall to set scheduler
_, _, errno := syscall.Syscall(syscall.SYS_SCHED_SETSCHEDULER,
uintptr(tid),
uintptr(policy),
uintptr(unsafe.Pointer(param)))
if errno != 0 {
// If we can't set real-time priority, try nice value instead
if policy != SCHED_NORMAL {
ps.logger.Warn().Int("errno", int(errno)).Msg("Failed to set real-time priority, falling back to nice")
return ps.setNicePriority(priority)
}
return errno
}
ps.logger.Debug().Int("tid", tid).Int("priority", priority).Int("policy", policy).Msg("Thread priority set")
return nil
}
// setNicePriority sets nice value as fallback when real-time scheduling is not available
func (ps *PriorityScheduler) setNicePriority(rtPriority int) error {
// Convert real-time priority to nice value (inverse relationship)
// RT priority 80 -> nice -10, RT priority 40 -> nice 0
niceValue := (40 - rtPriority) / 4
if niceValue < -20 {
niceValue = -20
}
if niceValue > 19 {
niceValue = 19
}
err := syscall.Setpriority(syscall.PRIO_PROCESS, 0, niceValue)
if err != nil {
ps.logger.Warn().Err(err).Int("nice", niceValue).Msg("Failed to set nice priority")
return err
}
ps.logger.Debug().Int("nice", niceValue).Msg("Nice priority set as fallback")
return nil
}
// SetAudioProcessingPriority sets high priority for audio processing threads
func (ps *PriorityScheduler) SetAudioProcessingPriority() error {
return ps.SetThreadPriority(AudioHighPriority, SCHED_FIFO)
}
// SetAudioIOPriority sets medium priority for audio I/O threads
func (ps *PriorityScheduler) SetAudioIOPriority() error {
return ps.SetThreadPriority(AudioMediumPriority, SCHED_FIFO)
}
// SetAudioBackgroundPriority sets low priority for background audio tasks
func (ps *PriorityScheduler) SetAudioBackgroundPriority() error {
return ps.SetThreadPriority(AudioLowPriority, SCHED_FIFO)
}
// ResetPriority resets thread to normal scheduling
func (ps *PriorityScheduler) ResetPriority() error {
return ps.SetThreadPriority(NormalPriority, SCHED_NORMAL)
}
// Disable disables priority scheduling (useful for testing or fallback)
func (ps *PriorityScheduler) Disable() {
ps.enabled = false
ps.logger.Info().Msg("Priority scheduling disabled")
}
// Enable enables priority scheduling
func (ps *PriorityScheduler) Enable() {
ps.enabled = true
ps.logger.Info().Msg("Priority scheduling enabled")
}
// Global priority scheduler instance
var globalPriorityScheduler *PriorityScheduler
// GetPriorityScheduler returns the global priority scheduler instance
func GetPriorityScheduler() *PriorityScheduler {
if globalPriorityScheduler == nil {
globalPriorityScheduler = NewPriorityScheduler()
}
return globalPriorityScheduler
}
// SetAudioThreadPriority is a convenience function to set audio processing priority
func SetAudioThreadPriority() error {
return GetPriorityScheduler().SetAudioProcessingPriority()
}
// SetAudioIOThreadPriority is a convenience function to set audio I/O priority
func SetAudioIOThreadPriority() error {
return GetPriorityScheduler().SetAudioIOPriority()
}
// ResetThreadPriority is a convenience function to reset thread priority
func ResetThreadPriority() error {
return GetPriorityScheduler().ResetPriority()
}

View File

@ -2,6 +2,7 @@ package audio
import (
"context"
"fmt"
"sync"
"time"
@ -13,6 +14,10 @@ import (
// AudioRelay handles forwarding audio frames from the audio server subprocess
// to WebRTC without any CGO audio processing. This runs in the main process.
type AudioRelay struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
framesRelayed int64
framesDropped int64
client *AudioClient
ctx context.Context
cancel context.CancelFunc
@ -25,10 +30,6 @@ type AudioRelay struct {
audioTrack AudioTrackWriter
config AudioConfig
muted bool
// Statistics
framesRelayed int64
framesDropped int64
}
// AudioTrackWriter interface for WebRTC audio track
@ -58,14 +59,16 @@ func (r *AudioRelay) Start(audioTrack AudioTrackWriter, config AudioConfig) erro
}
// Create audio client to connect to subprocess
client, err := NewAudioClient()
if err != nil {
return err
}
client := NewAudioClient()
r.client = client
r.audioTrack = audioTrack
r.config = config
// Connect to the audio output server
if err := client.Connect(); err != nil {
return fmt.Errorf("failed to connect to audio output server: %w", err)
}
// Start relay goroutine
r.wg.Add(1)
go r.relayLoop()
@ -88,7 +91,7 @@ func (r *AudioRelay) Stop() {
r.wg.Wait()
if r.client != nil {
r.client.Close()
r.client.Disconnect()
r.client = nil
}

314
internal/audio/zero_copy.go Normal file
View File

@ -0,0 +1,314 @@
package audio
import (
"sync"
"sync/atomic"
"unsafe"
)
// ZeroCopyAudioFrame represents an audio frame that can be passed between
// components without copying the underlying data
type ZeroCopyAudioFrame struct {
data []byte
length int
capacity int
refCount int32
mutex sync.RWMutex
pooled bool
}
// ZeroCopyFramePool manages reusable zero-copy audio frames
type ZeroCopyFramePool struct {
// Atomic fields MUST be first for ARM32 alignment (int64 fields need 8-byte alignment)
counter int64 // Frame counter (atomic)
hitCount int64 // Pool hit counter (atomic)
missCount int64 // Pool miss counter (atomic)
// Other fields
pool sync.Pool
maxSize int
mutex sync.RWMutex
// Memory optimization fields
preallocated []*ZeroCopyAudioFrame // Pre-allocated frames for immediate use
preallocSize int // Number of pre-allocated frames
maxPoolSize int // Maximum pool size to prevent memory bloat
}
// NewZeroCopyFramePool creates a new zero-copy frame pool
func NewZeroCopyFramePool(maxFrameSize int) *ZeroCopyFramePool {
// Pre-allocate 15 frames for immediate availability
preallocSize := 15
maxPoolSize := 50 // Limit total pool size
preallocated := make([]*ZeroCopyAudioFrame, 0, preallocSize)
// Pre-allocate frames to reduce initial allocation overhead
for i := 0; i < preallocSize; i++ {
frame := &ZeroCopyAudioFrame{
data: make([]byte, 0, maxFrameSize),
capacity: maxFrameSize,
pooled: true,
}
preallocated = append(preallocated, frame)
}
return &ZeroCopyFramePool{
maxSize: maxFrameSize,
preallocated: preallocated,
preallocSize: preallocSize,
maxPoolSize: maxPoolSize,
pool: sync.Pool{
New: func() interface{} {
return &ZeroCopyAudioFrame{
data: make([]byte, 0, maxFrameSize),
capacity: maxFrameSize,
pooled: true,
}
},
},
}
}
// Get retrieves a zero-copy frame from the pool
func (p *ZeroCopyFramePool) Get() *ZeroCopyAudioFrame {
// First try pre-allocated frames for fastest access
p.mutex.Lock()
if len(p.preallocated) > 0 {
frame := p.preallocated[len(p.preallocated)-1]
p.preallocated = p.preallocated[:len(p.preallocated)-1]
p.mutex.Unlock()
frame.mutex.Lock()
frame.refCount = 1
frame.length = 0
frame.data = frame.data[:0]
frame.mutex.Unlock()
atomic.AddInt64(&p.hitCount, 1)
return frame
}
p.mutex.Unlock()
// Try sync.Pool next
frame := p.pool.Get().(*ZeroCopyAudioFrame)
frame.mutex.Lock()
frame.refCount = 1
frame.length = 0
frame.data = frame.data[:0]
frame.mutex.Unlock()
atomic.AddInt64(&p.hitCount, 1)
return frame
}
// Put returns a zero-copy frame to the pool
func (p *ZeroCopyFramePool) Put(frame *ZeroCopyAudioFrame) {
if frame == nil || !frame.pooled {
return
}
frame.mutex.Lock()
frame.refCount--
if frame.refCount <= 0 {
frame.refCount = 0
frame.length = 0
frame.data = frame.data[:0]
frame.mutex.Unlock()
// First try to return to pre-allocated pool for fastest reuse
p.mutex.Lock()
if len(p.preallocated) < p.preallocSize {
p.preallocated = append(p.preallocated, frame)
p.mutex.Unlock()
return
}
p.mutex.Unlock()
// Check pool size limit to prevent excessive memory usage
p.mutex.RLock()
currentCount := atomic.LoadInt64(&p.counter)
p.mutex.RUnlock()
if currentCount >= int64(p.maxPoolSize) {
return // Pool is full, let GC handle this frame
}
// Return to sync.Pool
p.pool.Put(frame)
atomic.AddInt64(&p.counter, 1)
} else {
frame.mutex.Unlock()
}
}
// Data returns the frame data as a slice (zero-copy view)
func (f *ZeroCopyAudioFrame) Data() []byte {
f.mutex.RLock()
defer f.mutex.RUnlock()
return f.data[:f.length]
}
// SetData sets the frame data (zero-copy if possible)
func (f *ZeroCopyAudioFrame) SetData(data []byte) error {
f.mutex.Lock()
defer f.mutex.Unlock()
if len(data) > f.capacity {
// Need to reallocate - not zero-copy but necessary
f.data = make([]byte, len(data))
f.capacity = len(data)
f.pooled = false // Can't return to pool anymore
}
// Zero-copy assignment when data fits in existing buffer
if cap(f.data) >= len(data) {
f.data = f.data[:len(data)]
copy(f.data, data)
} else {
f.data = append(f.data[:0], data...)
}
f.length = len(data)
return nil
}
// SetDataDirect sets frame data using direct buffer assignment (true zero-copy)
// WARNING: The caller must ensure the buffer remains valid for the frame's lifetime
func (f *ZeroCopyAudioFrame) SetDataDirect(data []byte) {
f.mutex.Lock()
defer f.mutex.Unlock()
f.data = data
f.length = len(data)
f.capacity = cap(data)
f.pooled = false // Direct assignment means we can't pool this frame
}
// AddRef increments the reference count for shared access
func (f *ZeroCopyAudioFrame) AddRef() {
f.mutex.Lock()
f.refCount++
f.mutex.Unlock()
}
// Release decrements the reference count
func (f *ZeroCopyAudioFrame) Release() {
f.mutex.Lock()
f.refCount--
f.mutex.Unlock()
}
// Length returns the current data length
func (f *ZeroCopyAudioFrame) Length() int {
f.mutex.RLock()
defer f.mutex.RUnlock()
return f.length
}
// Capacity returns the buffer capacity
func (f *ZeroCopyAudioFrame) Capacity() int {
f.mutex.RLock()
defer f.mutex.RUnlock()
return f.capacity
}
// UnsafePointer returns an unsafe pointer to the data for CGO calls
// WARNING: Only use this for CGO interop, ensure frame lifetime
func (f *ZeroCopyAudioFrame) UnsafePointer() unsafe.Pointer {
f.mutex.RLock()
defer f.mutex.RUnlock()
if len(f.data) == 0 {
return nil
}
return unsafe.Pointer(&f.data[0])
}
// Global zero-copy frame pool
// GetZeroCopyPoolStats returns detailed statistics about the zero-copy frame pool
func (p *ZeroCopyFramePool) GetZeroCopyPoolStats() ZeroCopyFramePoolStats {
p.mutex.RLock()
preallocatedCount := len(p.preallocated)
currentCount := atomic.LoadInt64(&p.counter)
p.mutex.RUnlock()
hitCount := atomic.LoadInt64(&p.hitCount)
missCount := atomic.LoadInt64(&p.missCount)
totalRequests := hitCount + missCount
var hitRate float64
if totalRequests > 0 {
hitRate = float64(hitCount) / float64(totalRequests) * 100
}
return ZeroCopyFramePoolStats{
MaxFrameSize: p.maxSize,
MaxPoolSize: p.maxPoolSize,
CurrentPoolSize: currentCount,
PreallocatedCount: int64(preallocatedCount),
PreallocatedMax: int64(p.preallocSize),
HitCount: hitCount,
MissCount: missCount,
HitRate: hitRate,
}
}
// ZeroCopyFramePoolStats provides detailed zero-copy pool statistics
type ZeroCopyFramePoolStats struct {
MaxFrameSize int
MaxPoolSize int
CurrentPoolSize int64
PreallocatedCount int64
PreallocatedMax int64
HitCount int64
MissCount int64
HitRate float64 // Percentage
}
var (
globalZeroCopyPool = NewZeroCopyFramePool(MaxAudioFrameSize)
)
// GetZeroCopyFrame gets a frame from the global pool
func GetZeroCopyFrame() *ZeroCopyAudioFrame {
return globalZeroCopyPool.Get()
}
// GetGlobalZeroCopyPoolStats returns statistics for the global zero-copy pool
func GetGlobalZeroCopyPoolStats() ZeroCopyFramePoolStats {
return globalZeroCopyPool.GetZeroCopyPoolStats()
}
// PutZeroCopyFrame returns a frame to the global pool
func PutZeroCopyFrame(frame *ZeroCopyAudioFrame) {
globalZeroCopyPool.Put(frame)
}
// ZeroCopyAudioReadEncode performs audio read and encode with zero-copy optimization
func ZeroCopyAudioReadEncode() (*ZeroCopyAudioFrame, error) {
frame := GetZeroCopyFrame()
// Ensure frame has enough capacity
if frame.Capacity() < MaxAudioFrameSize {
// Reallocate if needed
frame.data = make([]byte, MaxAudioFrameSize)
frame.capacity = MaxAudioFrameSize
frame.pooled = false
}
// Use unsafe pointer for direct CGO call
n, err := CGOAudioReadEncode(frame.data[:MaxAudioFrameSize])
if err != nil {
PutZeroCopyFrame(frame)
return nil, err
}
if n == 0 {
PutZeroCopyFrame(frame)
return nil, nil
}
// Set the actual data length
frame.mutex.Lock()
frame.length = n
frame.data = frame.data[:n]
frame.mutex.Unlock()
return frame, nil
}

View File

@ -31,6 +31,9 @@ func runAudioServer() {
}
func startAudioSubprocess() error {
// Start adaptive buffer management for optimal performance
audio.StartAdaptiveBuffering()
// Create audio server supervisor
audioSupervisor = audio.NewAudioServerSupervisor()
@ -59,6 +62,8 @@ func startAudioSubprocess() error {
// Stop audio relay when process exits
audio.StopAudioRelay()
// Stop adaptive buffering
audio.StopAdaptiveBuffering()
},
// onRestart
func(attempt int, delay time.Duration) {

3
web.go
View File

@ -457,6 +457,9 @@ func setupRouter() *gin.Engine {
})
})
// Audio memory allocation metrics endpoint
protected.GET("/audio/memory-metrics", gin.WrapF(audio.HandleMemoryMetrics))
protected.GET("/microphone/process-metrics", func(c *gin.Context) {
if currentSession == nil || currentSession.AudioInputManager == nil {
c.JSON(200, gin.H{