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* AudioMonitor - Performance and memory monitoring for audio system
* Tracks memory usage, load times, and FPS impact
*/
export interface AudioMemoryStats {
readonly totalLoadedMB: number;
readonly assetCount: number;
readonly estimatedSizeMB: number;
readonly largestAssetMB: number;
readonly averageAssetMB: number;
}
export interface AudioPerformanceStats {
readonly averageLoadTimeMs: number;
readonly maxLoadTimeMs: number;
readonly minLoadTimeMs: number;
readonly totalLoads: number;
readonly failedLoads: number;
readonly averagePlaybackLatencyMs: number;
}
export interface AudioFPSImpact {
readonly baselineFPS: number;
readonly currentFPS: number;
readonly fpsDropDuringLoad: number;
readonly fpsDropDuringPlayback: number;
readonly impactDetected: boolean;
}
export interface MemoryWarning {
readonly level: "info" | "warning" | "critical";
readonly message: string;
readonly currentMB: number;
readonly thresholdMB: number;
readonly timestamp: number;
}
export class AudioMonitor {
private memoryThresholdMB = 100;
private loadTimes: number[] = [];
private playbackLatencies: number[] = [];
private failedLoadCount = 0;
private totalLoadCount = 0;
private assetSizes: Map<string, number> = new Map();
private warnings: MemoryWarning[] = [];
private lastFPSCheck = 0;
private baselineFPS = 60;
private currentFPS = 60;
private fpsHistory: number[] = [];
private lastWarningTime = 0;
private readonly WARNING_COOLDOWN_MS = 5000; // 5 seconds between similar warnings
/**
* Record a successful asset load
*/
recordLoad(assetId: string, loadTimeMs: number, estimatedSizeMB: number): void {
this.totalLoadCount++;
this.loadTimes.push(loadTimeMs);
this.assetSizes.set(assetId, estimatedSizeMB);
// Keep only last 100 load times
if (this.loadTimes.length > 100) {
this.loadTimes.shift();
}
// Check memory threshold
this.checkMemoryThreshold();
}
/**
* Record a failed asset load
*/
recordLoadFailure(assetId: string, error: Error): void {
this.failedLoadCount++;
this.totalLoadCount++;
console.warn(`Load failed for ${assetId}:`, error.message);
}
/**
* Record playback latency (time from play() call to actual playback)
*/
recordPlaybackLatency(latencyMs: number): void {
this.playbackLatencies.push(latencyMs);
// Keep only last 100 measurements
if (this.playbackLatencies.length > 100) {
this.playbackLatencies.shift();
}
}
/**
* Update current FPS measurement
*/
updateFPS(fps: number): void {
this.currentFPS = fps;
this.fpsHistory.push(fps);
// Keep only last 60 measurements (1 second at 60fps)
if (this.fpsHistory.length > 60) {
this.fpsHistory.shift();
}
// Update baseline if we haven't checked recently
const now = Date.now();
if (now - this.lastFPSCheck > 5000) {
// 5 seconds
this.updateBaseline();
this.lastFPSCheck = now;
}
}
/**
* Get current memory statistics
*/
getMemoryStats(): AudioMemoryStats {
const sizes = Array.from(this.assetSizes.values());
const totalLoadedMB = sizes.reduce((sum, size) => sum + size, 0);
const averageAssetMB = sizes.length > 0 ? totalLoadedMB / sizes.length : 0;
const largestAssetMB = sizes.length > 0 ? Math.max(...sizes) : 0;
return {
totalLoadedMB,
assetCount: this.assetSizes.size,
estimatedSizeMB: totalLoadedMB,
largestAssetMB,
averageAssetMB,
};
}
/**
* Get current performance statistics
*/
getPerformanceStats(): AudioPerformanceStats {
const avgLoadTime =
this.loadTimes.length > 0
? this.loadTimes.reduce((sum, t) => sum + t, 0) / this.loadTimes.length
: 0;
const maxLoadTime =
this.loadTimes.length > 0 ? Math.max(...this.loadTimes) : 0;
const minLoadTime =
this.loadTimes.length > 0 ? Math.min(...this.loadTimes) : 0;
const avgLatency =
this.playbackLatencies.length > 0
? this.playbackLatencies.reduce((sum, l) => sum + l, 0) /
this.playbackLatencies.length
: 0;
return {
averageLoadTimeMs: avgLoadTime,
maxLoadTimeMs: maxLoadTime,
minLoadTimeMs: minLoadTime,
totalLoads: this.totalLoadCount,
failedLoads: this.failedLoadCount,
averagePlaybackLatencyMs: avgLatency,
};
}
/**
* Get FPS impact analysis
*/
getFPSImpact(): AudioFPSImpact {
const avgFPS =
this.fpsHistory.length > 0
? this.fpsHistory.reduce((sum, fps) => sum + fps, 0) /
this.fpsHistory.length
: this.currentFPS;
const fpsDropDuringLoad = this.baselineFPS - avgFPS;
const fpsDropDuringPlayback = this.baselineFPS - this.currentFPS;
const impactDetected = fpsDropDuringLoad > 5 || fpsDropDuringPlayback > 5;
return {
baselineFPS: this.baselineFPS,
currentFPS: this.currentFPS,
fpsDropDuringLoad,
fpsDropDuringPlayback,
impactDetected,
};
}
/**
* Get all warnings
*/
getWarnings(): readonly MemoryWarning[] {
return [...this.warnings];
}
/**
* Get recent warnings (last N)
*/
getRecentWarnings(count: number = 10): readonly MemoryWarning[] {
return this.warnings.slice(-count);
}
/**
* Clear all warnings
*/
clearWarnings(): void {
this.warnings = [];
}
/**
* Set memory threshold for warnings
*/
setMemoryThreshold(thresholdMB: number): void {
this.memoryThresholdMB = thresholdMB;
}
/**
* Check memory threshold and create warnings with rate limiting
*/
private checkMemoryThreshold(): void {
const stats = this.getMemoryStats();
const currentMB = stats.totalLoadedMB;
const now = Date.now();
// Rate limit warnings to prevent spam during rapid asset loading
if (now - this.lastWarningTime < this.WARNING_COOLDOWN_MS) {
return;
}
if (currentMB > this.memoryThresholdMB * 1.5) {
// 150% threshold
this.addWarning({
level: "critical",
message: `Audio memory usage critical: ${currentMB.toFixed(1)}MB (threshold: ${this.memoryThresholdMB}MB)`,
currentMB,
thresholdMB: this.memoryThresholdMB,
timestamp: now,
});
this.lastWarningTime = now;
} else if (currentMB > this.memoryThresholdMB) {
// 100% threshold
this.addWarning({
level: "warning",
message: `Audio memory usage high: ${currentMB.toFixed(1)}MB (threshold: ${this.memoryThresholdMB}MB)`,
currentMB,
thresholdMB: this.memoryThresholdMB,
timestamp: now,
});
this.lastWarningTime = now;
} else if (currentMB > this.memoryThresholdMB * 0.8) {
// 80% threshold
this.addWarning({
level: "info",
message: `Audio memory usage approaching threshold: ${currentMB.toFixed(1)}MB (threshold: ${this.memoryThresholdMB}MB)`,
currentMB,
thresholdMB: this.memoryThresholdMB,
timestamp: now,
});
this.lastWarningTime = now;
}
}
/**
* Add a warning to the list
*/
private addWarning(warning: MemoryWarning): void {
this.warnings.push(warning);
// Keep only last 100 warnings
Iif (this.warnings.length > 100) {
this.warnings.shift();
}
// Log critical warnings
if (warning.level === "critical") {
console.error(warning.message);
} else if (warning.level === "warning") {
console.warn(warning.message);
}
}
/**
* Update baseline FPS based on recent stable measurements
*/
private updateBaseline(): void {
Eif (this.fpsHistory.length < 30) {
return; // Need more data
}
// Get average of recent stable FPS measurements
const recent = this.fpsHistory.slice(-30);
const avg = recent.reduce((sum, fps) => sum + fps, 0) / recent.length;
// Allow baseline to adjust with dampening (slower downward adjustment)
if (avg > this.baselineFPS) {
this.baselineFPS = Math.min(avg, 60); // Cap at 60fps
} else if (avg < this.baselineFPS - 5) {
// Only adjust down if significantly lower (5fps drop)
this.baselineFPS = Math.max(avg, 30); // Floor at 30fps
}
}
/**
* Reset all statistics
*/
reset(): void {
this.loadTimes = [];
this.playbackLatencies = [];
this.failedLoadCount = 0;
this.totalLoadCount = 0;
this.assetSizes.clear();
this.warnings = [];
this.fpsHistory = [];
}
/**
* Unregister an asset (when unloaded)
*/
unregisterAsset(assetId: string): void {
this.assetSizes.delete(assetId);
}
/**
* Get comprehensive report
*/
getReport(): {
readonly memory: AudioMemoryStats;
readonly performance: AudioPerformanceStats;
readonly fps: AudioFPSImpact;
readonly warnings: readonly MemoryWarning[];
} {
return {
memory: this.getMemoryStats(),
performance: this.getPerformanceStats(),
fps: this.getFPSImpact(),
warnings: this.getRecentWarnings(5),
};
}
}
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