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\"name\": \"lip-sync-engine\",\n \"version\": \"1.0.3\",\n \"description\": \"🎙️ WebAssembly port of Rhubarb Lip Sync for browser-based lip-sync animation. Analyzes audio to generate precise mouth movements using PocketSphinx speech recognition. Framework-agnostic TypeScript API for React, Vue, Svelte, Next.js, and vanilla JS. Perfect for games, chatbots, and virtual characters.\",\n \"author\": \"Santiago Forero\",\n \"license\": \"MIT\",\n \"keywords\": [\n \"lip-sync\",\n \"speech-recognition\",\n \"animation\",\n \"wasm\",\n \"webassembly\",\n \"typescript\",\n \"rhubarb\",\n \"visemes\",\n \"phonemes\",\n \"framework-agnostic\"\n ],\n \"main\": \"./dist/index.js\",\n \"module\": \"./dist/index.mjs\",\n \"types\": \"./dist/index.d.ts\",\n \"exports\": {\n \".\": {\n \"types\": \"./dist/index.d.ts\",\n \"import\": \"./dist/index.mjs\",\n \"require\": \"./dist/index.js\"\n },\n \"./worker\": {\n \"import\": \"./dist/worker.js\"\n },\n \"./wasm\": {\n \"default\": \"./dist/wasm/lip-sync-engine.js\"\n },\n \"./dist/wasm/lip-sync-engine.wasm\": \"./dist/wasm/lip-sync-engine.wasm\",\n \"./dist/wasm/lip-sync-engine.data\": \"./dist/wasm/lip-sync-engine.data\",\n \"./dist/wasm/lip-sync-engine.js\": \"./dist/wasm/lip-sync-engine.js\",\n \"./dist/worker.js\": \"./dist/worker.js\"\n },\n \"files\": [\n \"dist\",\n \"README.md\",\n \"LICENSE\"\n ],\n \"scripts\": {\n \"build:wasm\": \"./scripts/build-wasm.sh\",\n \"build:ts\": \"tsup\",\n \"build\": \"npm run build:wasm && npm run build:ts\",\n \"dev\": \"tsup --watch\",\n \"test\": \"vitest run\",\n \"test:watch\": \"vitest\",\n \"typecheck\": \"tsc --noEmit\",\n \"clean\": \"rm -rf dist build\",\n \"prepublishOnly\": \"npm run clean && npm run build\"\n },\n \"devDependencies\": {\n \"@types/node\": \"^20.10.0\",\n \"tsup\": \"^8.0.1\",\n \"typescript\": \"^5.3.3\",\n \"vitest\": \"^1.0.4\"\n },\n \"sideEffects\": false,\n \"repository\": {\n \"type\": \"git\",\n \"url\": \"git+https://github.com/biolimbo/lip-sync-engine.git\"\n },\n \"bugs\": {\n \"url\": \"https://github.com/biolimbo/lip-sync-engine/issues\"\n },\n \"homepage\": \"https://github.com/biolimbo/lip-sync-engine#readme\"\n}\n","import type { LipSyncEngineResult, LipSyncEngineOptions } from './types';\nimport type { WorkerRequest, WorkerResponse } from './worker';\nimport packageJson from '../../package.json';\n\n/**\n * Represents a worker in the pool\n */\ninterface PoolWorker {\n worker: Worker;\n busy: boolean;\n ready: boolean;\n}\n\n/**\n * Represents a pending analysis job\n */\ninterface PendingJob {\n id: number;\n pcm16: Int16Array;\n options: LipSyncEngineOptions;\n resolve: (result: LipSyncEngineResult) => void;\n reject: (error: Error) => void;\n}\n\n/**\n * Web Worker pool for non-blocking lip-sync-engine analysis\n * Manages multiple workers with automatic load balancing\n */\nexport class WorkerPool {\n private static instance: WorkerPool | null = null;\n\n private workers: PoolWorker[] = [];\n private queue: PendingJob[] = [];\n private inFlightJobs: Map = new Map();\n private nextJobId = 0;\n private maxWorkers: number;\n private workerScriptUrl: string;\n private wasmPaths: {\n wasmPath: string;\n dataPath: string;\n jsPath: string;\n };\n private initialized = false;\n\n private constructor(\n maxWorkers: number = navigator.hardwareConcurrency || 4,\n workerScriptUrl?: string\n ) {\n this.maxWorkers = Math.max(1, maxWorkers);\n\n const version = packageJson.version;\n\n // Default worker script URL - uses CDN, can be overridden\n this.workerScriptUrl = workerScriptUrl || `https://unpkg.com/lip-sync-engine@${version}/dist/worker.js`;\n\n // Default WASM paths - uses CDN, can be configured via init()\n this.wasmPaths = {\n wasmPath: `https://unpkg.com/lip-sync-engine@${version}/dist/wasm/lip-sync-engine.wasm`,\n dataPath: `https://unpkg.com/lip-sync-engine@${version}/dist/wasm/lip-sync-engine.data`,\n jsPath: `https://unpkg.com/lip-sync-engine@${version}/dist/wasm/lip-sync-engine.js`\n };\n }\n\n /**\n * Get singleton instance\n */\n static getInstance(maxWorkers?: number, workerScriptUrl?: string): WorkerPool {\n if (!this.instance) {\n this.instance = new WorkerPool(maxWorkers, workerScriptUrl);\n }\n return this.instance;\n }\n\n /**\n * Initialize the worker pool\n * Must be called before using analyze()\n *\n * Strategy: Start with 1 worker for fast initialization\n * - Use warmup() to create all workers upfront if needed\n * - Workers scale on-demand automatically\n */\n async init(options?: {\n wasmPath?: string;\n dataPath?: string;\n jsPath?: string;\n workerScriptUrl?: string;\n }): Promise {\n if (this.initialized) {\n return;\n }\n\n // Update paths if provided\n if (options) {\n if (options.wasmPath) this.wasmPaths.wasmPath = options.wasmPath;\n if (options.dataPath) this.wasmPaths.dataPath = options.dataPath;\n if (options.jsPath) this.wasmPaths.jsPath = options.jsPath;\n if (options.workerScriptUrl) this.workerScriptUrl = options.workerScriptUrl;\n }\n\n // Start with 1 worker for fast initialization\n // More workers will be created on-demand when needed\n await this.createWorker();\n\n this.initialized = true;\n }\n\n /**\n * Pre-create all workers up to maxWorkers\n * Call this during app initialization to eliminate worker creation overhead\n *\n * @example\n * ```typescript\n * const pool = WorkerPool.getInstance();\n * await pool.init({ ... });\n * await pool.warmup(); // Pre-create all workers\n * // Now all workers are ready for chunked processing\n * ```\n */\n async warmup(): Promise {\n if (!this.initialized) {\n throw new Error('WorkerPool not initialized. Call init() first.');\n }\n\n const workersToCreate = this.maxWorkers - this.workers.length;\n\n if (workersToCreate <= 0) {\n return; // Already at max workers\n }\n\n // Create remaining workers in parallel\n const promises: Promise[] = [];\n for (let i = 0; i < workersToCreate; i++) {\n promises.push(this.createWorker());\n }\n\n await Promise.all(promises);\n }\n\n /**\n * Create a new worker and initialize it\n */\n private async createWorker(): Promise {\n return new Promise(async (resolve, reject) => {\n try {\n // If the worker URL is from a CDN (cross-origin), fetch it and create a blob URL\n let workerUrl = this.workerScriptUrl;\n if (workerUrl.startsWith('http://') || workerUrl.startsWith('https://')) {\n try {\n const response = await fetch(workerUrl);\n const blob = await response.blob();\n workerUrl = URL.createObjectURL(blob);\n } catch (fetchError) {\n console.warn('Failed to fetch worker script, trying direct URL:', fetchError);\n // Fall back to direct URL (will fail with CORS but worth trying)\n }\n }\n\n const worker = new Worker(workerUrl);\n\n const poolWorker: PoolWorker = {\n worker,\n busy: false,\n ready: false\n };\n\n // Set up message handler\n worker.onmessage = (event: MessageEvent) => {\n this.handleWorkerMessage(poolWorker, event.data);\n };\n\n worker.onerror = (error) => {\n console.error('Worker error:', error);\n this.removeWorker(poolWorker);\n };\n\n // Wait for worker to be ready\n const initHandler = (event: MessageEvent) => {\n if (event.data.type === 'ready') {\n poolWorker.ready = true;\n this.workers.push(poolWorker);\n worker.removeEventListener('message', initHandler);\n resolve(poolWorker);\n } else if (event.data.type === 'error') {\n worker.removeEventListener('message', initHandler);\n reject(new Error(event.data.error || 'Worker initialization failed'));\n }\n };\n\n worker.addEventListener('message', initHandler);\n\n // Send init message\n const initMessage: WorkerRequest = {\n type: 'init',\n ...this.wasmPaths\n };\n worker.postMessage(initMessage);\n\n } catch (error) {\n reject(error);\n }\n });\n }\n\n /**\n * Handle messages from workers\n */\n private handleWorkerMessage(poolWorker: PoolWorker, message: WorkerResponse): void {\n if (message.type === 'result') {\n // Find and resolve the in-flight job\n const job = this.inFlightJobs.get(message.id);\n if (job) {\n this.inFlightJobs.delete(message.id);\n\n if (message.result) {\n job.resolve(message.result);\n } else {\n job.reject(new Error('No result returned from worker'));\n }\n }\n\n // Mark worker as available and process next job\n poolWorker.busy = false;\n this.processQueue();\n\n } else if (message.type === 'error') {\n // Check if this is an analyze error (has id) or init error (no id)\n if ('id' in message) {\n // Analyze error - find and reject the in-flight job\n const job = this.inFlightJobs.get(message.id);\n if (job) {\n this.inFlightJobs.delete(message.id);\n job.reject(new Error(message.error || 'Unknown worker error'));\n }\n\n // Mark worker as available and process next job\n poolWorker.busy = false;\n this.processQueue();\n }\n // Init errors are handled in createWorker()\n }\n }\n\n /**\n * Remove a worker from the pool\n */\n private removeWorker(poolWorker: PoolWorker): void {\n const index = this.workers.indexOf(poolWorker);\n if (index !== -1) {\n this.workers.splice(index, 1);\n poolWorker.worker.terminate();\n }\n }\n\n /**\n * Process queued jobs\n * Simple algorithm: assign each queued job to the next available idle worker\n * Workers must be pre-created via init() or warmup()\n */\n private processQueue(): void {\n // Assign all pending jobs to available idle workers\n while (this.queue.length > 0) {\n const idleWorker = this.workers.find(w => w.ready && !w.busy);\n\n if (!idleWorker) {\n // No idle workers available - jobs will be processed when a worker becomes free\n break;\n }\n\n const job = this.queue.shift();\n if (!job) break;\n\n this.assignJobToWorker(job, idleWorker);\n }\n }\n\n /**\n * Assign a job to a worker\n */\n private assignJobToWorker(job: PendingJob, worker: PoolWorker): void {\n // Add to in-flight jobs\n this.inFlightJobs.set(job.id, job);\n\n // Mark worker as busy\n worker.busy = true;\n\n // Send job to worker\n // Create a true copy with a new ArrayBuffer to avoid detaching the original\n const bufferCopy = new Int16Array(job.pcm16);\n\n const message: WorkerRequest = {\n type: 'analyze',\n id: job.id,\n pcm16: bufferCopy,\n options: job.options\n };\n\n // Use transferable objects for zero-copy transfer\n worker.worker.postMessage(message, [bufferCopy.buffer]);\n }\n\n /**\n * Analyze audio in a Web Worker (non-blocking)\n *\n * @param pcm16 - 16-bit PCM audio buffer\n * @param options - Optional configuration\n * @returns Promise resolving to lip-sync-engine result\n */\n async analyze(\n pcm16: Int16Array,\n options: LipSyncEngineOptions = {}\n ): Promise {\n if (!this.initialized) {\n throw new Error('WorkerPool not initialized. Call init() first.');\n }\n\n // Create a copy of the buffer since we'll transfer ownership to the worker\n const pcm16Copy = new Int16Array(pcm16);\n\n // Create job promise\n return new Promise((resolve, reject) => {\n const job: PendingJob = {\n id: this.nextJobId++,\n pcm16: pcm16Copy,\n options,\n resolve,\n reject\n };\n\n // Add to queue\n this.queue.push(job);\n\n // Try to process immediately\n this.processQueue();\n });\n }\n\n /**\n * Analyze multiple audio buffers in parallel using chunked processing\n *\n * @param chunks - Array of audio chunks to process\n * @param options - Optional configuration\n * @returns Promise resolving to array of results in same order as input\n */\n async analyzeChunks(\n chunks: Int16Array[],\n options: LipSyncEngineOptions = {}\n ): Promise {\n if (!this.initialized) {\n throw new Error('WorkerPool not initialized. Call init() first.');\n }\n\n // Analyze all chunks in parallel\n const promises = chunks.map(chunk => this.analyze(chunk, options));\n return Promise.all(promises);\n }\n\n /**\n * Create a dynamic streaming analyzer that allows adding chunks on-the-fly\n * Returns a controller that lets you add chunks as they arrive from a stream\n *\n * @param options - Optional configuration for all chunks\n * @returns StreamController with addChunk() and finalize() methods\n *\n * @example\n * ```typescript\n * const stream = pool.createStreamAnalyzer({ dialogText: \"hello\" });\n * await pool.warmup(); // Pre-create workers\n *\n * // Add chunks as they arrive from your audio stream\n * for await (const chunk of audioStream) {\n * stream.addChunk(chunk); // Non-blocking, queues immediately\n * }\n *\n * // Wait for all chunks to complete and get results in order\n * const results = await stream.finalize();\n * ```\n */\n createStreamAnalyzer(options: LipSyncEngineOptions = {}): StreamAnalyzerController {\n if (!this.initialized) {\n throw new Error('WorkerPool not initialized. Call init() first.');\n }\n\n const controller = new StreamAnalyzerController(this, options);\n return controller;\n }\n\n /**\n * Get pool statistics\n */\n getStats(): {\n totalWorkers: number;\n busyWorkers: number;\n idleWorkers: number;\n queuedJobs: number;\n maxWorkers: number;\n } {\n const busyWorkers = this.workers.filter(w => w.busy).length;\n return {\n totalWorkers: this.workers.length,\n busyWorkers,\n idleWorkers: this.workers.length - busyWorkers,\n queuedJobs: this.queue.length,\n maxWorkers: this.maxWorkers\n };\n }\n\n /**\n * Destroy the worker pool and terminate all workers\n */\n destroy(): void {\n // Reject all pending jobs in queue\n this.queue.forEach(job => {\n job.reject(new Error('WorkerPool destroyed'));\n });\n this.queue = [];\n\n // Reject all in-flight jobs\n this.inFlightJobs.forEach(job => {\n job.reject(new Error('WorkerPool destroyed'));\n });\n this.inFlightJobs.clear();\n\n // Terminate all workers\n this.workers.forEach(poolWorker => {\n poolWorker.worker.terminate();\n });\n this.workers = [];\n\n this.initialized = false;\n WorkerPool.instance = null;\n }\n}\n\n/**\n * Controller for dynamic streaming analysis\n * Allows adding chunks on-the-fly as they arrive from a stream\n */\nexport class StreamAnalyzerController {\n private pool: WorkerPool;\n private options: LipSyncEngineOptions;\n private chunks: Array<{ index: number; promise: Promise }> = [];\n private nextIndex = 0;\n private finalized = false;\n\n constructor(pool: WorkerPool, options: LipSyncEngineOptions) {\n this.pool = pool;\n this.options = options;\n }\n\n /**\n * Add a chunk to be analyzed\n * This immediately queues the chunk for processing - no main thread blocking\n *\n * @param chunk - Audio chunk to analyze\n * @returns The index of this chunk in the result array\n */\n addChunk(chunk: Int16Array): number {\n if (this.finalized) {\n throw new Error('Cannot add chunks after finalize() has been called');\n }\n\n const index = this.nextIndex++;\n const promise = this.pool.analyze(chunk, this.options);\n\n this.chunks.push({ index, promise });\n\n return index;\n }\n\n /**\n * Wait for all chunks to complete and return results in insertion order\n *\n * @returns Array of results in the same order chunks were added\n */\n async finalize(): Promise {\n this.finalized = true;\n\n // Wait for all chunks to complete\n const results = await Promise.all(this.chunks.map(c => c.promise));\n\n // Results are already in order since we preserved insertion order\n return results;\n }\n\n /**\n * Get current streaming statistics\n */\n getStats(): {\n chunksAdded: number;\n chunksCompleted: number;\n poolStats: ReturnType;\n } {\n return {\n chunksAdded: this.chunks.length,\n chunksCompleted: this.nextIndex,\n poolStats: this.pool.getStats()\n };\n }\n}\n","import type { LipSyncEngineModule, WasmLoaderOptions } from './types';\nimport packageJson from '../../package.json';\n\n// Declare worker globals for TypeScript\ndeclare const WorkerGlobalScope: any;\ndeclare function importScripts(...urls: string[]): void;\n\n/**\n * Loads the WASM module\n * This is a singleton loader that handles WASM initialization\n */\nexport class WasmLoader {\n private static modulePromise: Promise | null = null;\n private static module: LipSyncEngineModule | null = null;\n\n /**\n * Load the WASM module\n * @param options - Optional paths to WASM files\n * @returns Promise resolving to the loaded WASM module\n */\n static async load(options: WasmLoaderOptions = {}): Promise {\n // Return cached module if already loaded\n if (this.module) {\n return this.module;\n }\n\n // Return in-progress load if already loading\n if (this.modulePromise) {\n return this.modulePromise;\n }\n\n this.modulePromise = this._loadModule(options);\n this.module = await this.modulePromise;\n return this.module;\n }\n\n /**\n * Load module directly (for worker context)\n * This method doesn't use singleton caching and is suitable for workers\n */\n static async loadModule(options: WasmLoaderOptions = {}): Promise {\n return this._loadModuleImpl(options);\n }\n\n /**\n * Internal method to load the module\n */\n private static async _loadModule(\n options: WasmLoaderOptions\n ): Promise {\n return this._loadModuleImpl(options);\n }\n\n /**\n * Implementation of module loading that works in both window and worker contexts\n */\n private static async _loadModuleImpl(\n options: WasmLoaderOptions\n ): Promise {\n const version = packageJson.version;\n const {\n wasmPath = `https://unpkg.com/lip-sync-engine@${version}/dist/wasm/lip-sync-engine.wasm`,\n dataPath = `https://unpkg.com/lip-sync-engine@${version}/dist/wasm/lip-sync-engine.data`,\n jsPath = `https://unpkg.com/lip-sync-engine@${version}/dist/wasm/lip-sync-engine.js`,\n } = options;\n\n // Detect if we're in a worker context\n const isWorker = typeof WorkerGlobalScope !== 'undefined' && self instanceof WorkerGlobalScope;\n\n if (isWorker) {\n // Worker context - use importScripts\n return new Promise(async (resolve, reject) => {\n try {\n // Import the Emscripten JS file\n importScripts(jsPath);\n\n // The factory function is now available in global scope\n const createModule = (self as any).createLipSyncEngineModule;\n\n if (!createModule) {\n throw new Error(\n 'WASM module factory not found in worker. Make sure lip-sync-engine.js exports createLipSyncEngineModule.'\n );\n }\n\n const module = await createModule({\n locateFile: (path: string) => {\n if (path.endsWith('.wasm')) {\n return wasmPath;\n }\n if (path.endsWith('.data')) {\n return dataPath;\n }\n return path;\n },\n });\n\n resolve(module as LipSyncEngineModule);\n } catch (error) {\n reject(error);\n }\n });\n } else {\n // Window context - use dynamic script loading\n if (typeof window === 'undefined') {\n throw new Error('WasmLoader can only be used in browser or worker environments');\n }\n\n return new Promise((resolve, reject) => {\n const script = document.createElement('script');\n script.src = jsPath;\n script.async = true;\n\n script.onload = async () => {\n try {\n // The Emscripten module should expose a factory function\n const createModule = (window as any).createLipSyncEngineModule;\n\n if (!createModule) {\n throw new Error(\n 'WASM module factory not found. Make sure lip-sync-engine.js is loaded correctly.'\n );\n }\n\n const module = await createModule({\n locateFile: (path: string) => {\n if (path.endsWith('.wasm')) {\n return wasmPath;\n }\n if (path.endsWith('.data')) {\n return dataPath;\n }\n return path;\n },\n });\n\n resolve(module as LipSyncEngineModule);\n } catch (error) {\n reject(error);\n }\n };\n\n script.onerror = () => {\n reject(new Error(`Failed to load WASM module from ${jsPath}`));\n };\n\n document.head.appendChild(script);\n });\n }\n }\n\n /**\n * Reset the loader (useful for testing)\n */\n static reset(): void {\n this.module = null;\n this.modulePromise = null;\n }\n}\n","import type {\n LipSyncEngineResult,\n LipSyncEngineOptions,\n LipSyncEngineModule,\n WasmLoaderOptions,\n} from './types';\nimport { WasmLoader } from './WasmLoader';\n\n/**\n * Main API class for Lip Sync\n * Framework-agnostic - works with vanilla JS, React, Vue, Svelte, etc.\n *\n * @example Vanilla JavaScript\n * ```typescript\n * import { LipSyncEngine } from 'lip-sync-engine';\n *\n * const lipSyncEngine = LipSyncEngine.getInstance();\n * await lipSyncEngine.init();\n *\n * const result = await lipSyncEngine.analyze(pcm16Buffer, {\n * dialogText: \"Hello world\",\n * sampleRate: 16000\n * });\n *\n * console.log(result.mouthCues);\n * ```\n *\n * @example React\n * ```typescript\n * // Create a custom hook in your app\n * function useLipSyncEngine() {\n * const [result, setResult] = useState(null);\n * const lipSyncEngineRef = useRef(LipSyncEngine.getInstance());\n *\n * useEffect(() => {\n * lipSyncEngineRef.current.init();\n * return () => lipSyncEngineRef.current.destroy();\n * }, []);\n *\n * const analyze = async (pcm16, options) => {\n * const result = await lipSyncEngineRef.current.analyze(pcm16, options);\n * setResult(result);\n * };\n *\n * return { analyze, result };\n * }\n * ```\n */\nexport class LipSyncEngine {\n private static instance: LipSyncEngine | null = null;\n private module: LipSyncEngineModule | null = null;\n private initialized = false;\n private initPromise: Promise | null = null;\n\n private constructor() {}\n\n /**\n * Get singleton instance\n */\n static getInstance(): LipSyncEngine {\n if (!this.instance) {\n this.instance = new LipSyncEngine();\n }\n return this.instance;\n }\n\n /**\n * Initialize the WASM module\n * Call this once before using analyze()\n *\n * @param options - Optional paths to WASM files\n */\n async init(options: WasmLoaderOptions = {}): Promise {\n if (this.initialized) return;\n if (this.initPromise) return this.initPromise;\n\n this.initPromise = (async () => {\n // Load WASM module\n this.module = await WasmLoader.load(options);\n\n // Initialize LipSyncEngine with models\n const modelsPath = '/models';\n const modelsPathLen = this.module.lengthBytesUTF8(modelsPath) + 1;\n const modelsPathPtr = this.module._malloc(modelsPathLen);\n\n try {\n this.module.stringToUTF8(modelsPath, modelsPathPtr, modelsPathLen);\n const result = this.module._lipsyncengine_init(modelsPathPtr);\n\n if (result !== 0) {\n const errorPtr = this.module._lipsyncengine_get_last_error();\n const error = errorPtr\n ? this.module.UTF8ToString(errorPtr)\n : 'Unknown error';\n throw new Error(`LipSyncEngine initialization failed: ${error}`);\n }\n\n this.initialized = true;\n } finally {\n this.module._free(modelsPathPtr);\n }\n })();\n\n return this.initPromise;\n }\n\n /**\n * Analyze audio and generate lip-sync-engine data\n *\n * @param pcm16 - 16-bit PCM audio buffer (mono, 16kHz recommended)\n * @param options - Optional configuration\n * @returns Promise resolving to lip-sync-engine result with mouth cues\n *\n * @throws {TypeError} If pcm16 is not an Int16Array\n * @throws {Error} If audio buffer is empty\n * @throws {Error} If analysis fails\n */\n async analyze(\n pcm16: Int16Array,\n options: LipSyncEngineOptions = {}\n ): Promise {\n await this.init();\n\n if (!this.module) {\n throw new Error('Module not initialized');\n }\n\n const { dialogText, sampleRate = 16000 } = options;\n\n // Validate input\n if (!(pcm16 instanceof Int16Array)) {\n throw new TypeError('pcm16 must be an Int16Array');\n }\n\n if (pcm16.length === 0) {\n throw new Error('pcm16 buffer is empty');\n }\n\n if (sampleRate <= 0) {\n throw new Error('sampleRate must be positive');\n }\n\n let pcm16Ptr = 0;\n let dialogPtr = 0;\n let resultPtr = 0;\n\n try {\n // Allocate PCM buffer in WASM memory\n const pcm16Bytes = pcm16.length * 2;\n pcm16Ptr = this.module._malloc(pcm16Bytes);\n this.module.HEAP16.set(pcm16, pcm16Ptr / 2);\n\n // Allocate dialog text if provided\n if (dialogText) {\n const dialogLen = this.module.lengthBytesUTF8(dialogText) + 1;\n dialogPtr = this.module._malloc(dialogLen);\n this.module.stringToUTF8(dialogText, dialogPtr, dialogLen);\n }\n\n // Call WASM function\n resultPtr = this.module._lipsyncengine_analyze_pcm16(\n pcm16Ptr,\n pcm16.length,\n sampleRate,\n dialogPtr\n );\n\n if (!resultPtr) {\n const errorPtr = this.module._lipsyncengine_get_last_error();\n const error = errorPtr\n ? this.module.UTF8ToString(errorPtr)\n : 'Analysis failed';\n throw new Error(error);\n }\n\n // Parse JSON result\n const resultJson = this.module.UTF8ToString(resultPtr);\n const result: LipSyncEngineResult = JSON.parse(resultJson);\n\n // Add metadata\n result.metadata = {\n duration: result.mouthCues[result.mouthCues.length - 1]?.end || 0,\n sampleRate,\n dialogText,\n };\n\n return result;\n } finally {\n // Always cleanup allocated memory\n if (pcm16Ptr) this.module._free(pcm16Ptr);\n if (dialogPtr) this.module._free(dialogPtr);\n if (resultPtr) this.module._lipsyncengine_free(resultPtr);\n }\n }\n\n /**\n * Analyze audio using Web Worker (non-blocking)\n * Recommended for long audio files to avoid blocking UI\n *\n * @param pcm16 - 16-bit PCM audio buffer\n * @param options - Optional configuration\n * @returns Promise resolving to lip-sync-engine result\n */\n async analyzeAsync(\n pcm16: Int16Array,\n options: LipSyncEngineOptions = {}\n ): Promise {\n // Lazy load WorkerPool to avoid circular dependencies\n const { WorkerPool } = await import('./WorkerPool');\n const pool = WorkerPool.getInstance();\n return pool.analyze(pcm16, options);\n }\n\n /**\n * Destroy the instance and free resources\n * Call this when you're completely done with lip-sync-engine analysis\n */\n destroy(): void {\n this.module = null;\n this.initialized = false;\n this.initPromise = null;\n LipSyncEngine.instance = null;\n }\n}\n\n/**\n * Convenience function for one-off analysis\n * Framework-agnostic - works everywhere\n */\nexport const analyze = async (\n pcm16: Int16Array,\n options?: LipSyncEngineOptions\n): Promise => {\n const instance = LipSyncEngine.getInstance();\n await instance.init();\n return instance.analyze(pcm16, options);\n};\n\n/**\n * Convenience function for async analysis with Web Worker\n */\nexport const analyzeAsync = async (\n pcm16: Int16Array,\n options?: LipSyncEngineOptions\n): Promise => {\n const instance = LipSyncEngine.getInstance();\n return instance.analyzeAsync(pcm16, options);\n};\n","// Main exports\nexport { LipSyncEngine, analyze, analyzeAsync } from './LipSyncEngine';\nexport { WasmLoader } from './WasmLoader';\nexport { WorkerPool, StreamAnalyzerController } from './WorkerPool';\n\n// Utilities\nexport * from './utils/AudioConverter';\n\n// Types\nexport type {\n MouthCue,\n LipSyncEngineResult,\n LipSyncEngineOptions,\n LipSyncEngineModule,\n ProgressCallback,\n WasmLoaderOptions,\n} from './types';\n\n// Worker types\nexport type {\n WorkerAnalyzeRequest,\n WorkerAnalyzeResponse,\n WorkerInitRequest,\n WorkerInitResponse,\n WorkerRequest,\n WorkerResponse,\n} from './worker';\n","/**\n * Audio format conversion utilities\n * Framework-agnostic - works with any audio API\n */\n\n/**\n * Convert Float32Array to Int16Array PCM\n */\nexport function float32ToInt16(float32: Float32Array): Int16Array {\n const int16 = new Int16Array(float32.length);\n\n for (let i = 0; i < float32.length; i++) {\n const s = Math.max(-1, Math.min(1, float32[i]));\n int16[i] = s < 0 ? s * 0x8000 : s * 0x7fff;\n }\n\n return int16;\n}\n\n/**\n * Convert AudioBuffer to Int16Array PCM\n * @param audioBuffer - Web Audio API AudioBuffer\n * @param targetSampleRate - Target sample rate (default: 16000)\n * @returns Int16Array PCM data\n */\nexport function audioBufferToInt16(\n audioBuffer: AudioBuffer,\n targetSampleRate = 16000\n): Int16Array {\n const float32 = audioBuffer.getChannelData(0);\n\n // Resample if needed\n if (audioBuffer.sampleRate !== targetSampleRate) {\n const resampled = resample(\n float32,\n audioBuffer.sampleRate,\n targetSampleRate\n );\n return float32ToInt16(resampled);\n }\n\n return float32ToInt16(float32);\n}\n\n/**\n * Simple linear resampling\n * For better quality, consider using a dedicated library\n *\n * @param input - Input audio samples\n * @param fromRate - Source sample rate\n * @param toRate - Target sample rate\n * @returns Resampled audio\n */\nexport function resample(\n input: Float32Array,\n fromRate: number,\n toRate: number\n): Float32Array {\n if (fromRate === toRate) {\n return input;\n }\n\n const ratio = fromRate / toRate;\n const outputLength = Math.floor(input.length / ratio);\n const output = new Float32Array(outputLength);\n\n for (let i = 0; i < outputLength; i++) {\n const srcIndex = Math.floor(i * ratio);\n output[i] = input[srcIndex];\n }\n\n return output;\n}\n\n/**\n * Record audio from microphone\n *\n * @param durationMs - Recording duration in milliseconds\n * @param sampleRate - Target sample rate (default: 16000)\n * @returns Object containing PCM16 data and AudioBuffer\n */\nexport async function recordAudio(\n durationMs: number,\n sampleRate = 16000\n): Promise<{ pcm16: Int16Array; audioBuffer: AudioBuffer }> {\n const stream = await navigator.mediaDevices.getUserMedia({\n audio: {\n channelCount: 1,\n echoCancellation: true,\n noiseSuppression: true,\n },\n });\n\n const mediaRecorder = new MediaRecorder(stream);\n const audioChunks: Blob[] = [];\n\n mediaRecorder.ondataavailable = (event) => {\n audioChunks.push(event.data);\n };\n\n // Start recording\n mediaRecorder.start();\n\n // Record for specified duration\n await new Promise((resolve) => setTimeout(resolve, durationMs));\n\n // Stop recording\n mediaRecorder.stop();\n stream.getTracks().forEach((track) => track.stop());\n\n // Wait for final data\n await new Promise((resolve) => {\n mediaRecorder.onstop = resolve;\n });\n\n // Convert recorded audio to PCM\n const audioBlob = new Blob(audioChunks);\n const arrayBuffer = await audioBlob.arrayBuffer();\n\n const audioContext = new AudioContext({ sampleRate });\n const audioBuffer = await audioContext.decodeAudioData(arrayBuffer);\n\n const pcm16 = audioBufferToInt16(audioBuffer, sampleRate);\n\n return { pcm16, audioBuffer };\n}\n\n/**\n * Load audio from a URL or File\n *\n * @param source - URL string or File object\n * @param targetSampleRate - Target sample rate (default: 16000)\n * @returns Object containing PCM16 data and AudioBuffer\n */\nexport async function loadAudio(\n source: string | File,\n targetSampleRate = 16000\n): Promise<{ pcm16: Int16Array; audioBuffer: AudioBuffer }> {\n let arrayBuffer: ArrayBuffer;\n\n if (typeof source === 'string') {\n // Load from URL\n const response = await fetch(source);\n arrayBuffer = await response.arrayBuffer();\n } else {\n // Load from File\n arrayBuffer = await source.arrayBuffer();\n }\n\n const audioContext = new AudioContext({ sampleRate: targetSampleRate });\n const audioBuffer = await audioContext.decodeAudioData(arrayBuffer);\n\n const pcm16 = audioBufferToInt16(audioBuffer, targetSampleRate);\n\n return { pcm16, audioBuffer };\n}\n"]}