{"version":3,"sources":["../src/utils.ts","../src/logger.ts","../src/ProcessorWrapper.ts","../src/transformers/BackgroundTransformer.ts","../package.json","../src/webgl/utils.ts","../src/webgl/shader-programs/vertexShader.ts","../src/webgl/shader-programs/blurShader.ts","../src/webgl/shader-programs/boxBlurShader.ts","../src/webgl/shader-programs/compositeShader.ts","../src/webgl/shader-programs/downSampler.ts","../src/webgl/index.ts","../src/transformers/VideoTransformer.ts","../src/index.ts"],"sourcesContent":["/* eslint-disable @typescript-eslint/naming-convention */\nexport const supportsOffscreenCanvas = () => typeof OffscreenCanvas !== 'undefined';\n\nasync function sleep(time: number) {\n return new Promise((resolve) => setTimeout(resolve, time));\n}\n\nexport async function waitForTrackResolution(track: MediaStreamTrack) {\n const timeout = 500;\n\n // browsers report wrong initial resolution on iOS.\n // when slightly delaying the call to .getSettings(), the correct resolution is being reported\n await sleep(10);\n\n const started = Date.now();\n while (Date.now() - started < timeout) {\n const { width, height } = track.getSettings();\n if (width && height) {\n return { width, height };\n }\n await sleep(50);\n }\n return { width: undefined, height: undefined };\n}\n\nexport function createCanvas(width: number, height: number) {\n if (supportsOffscreenCanvas()) {\n return new OffscreenCanvas(width, height);\n }\n const canvas = document.createElement('canvas');\n canvas.width = width;\n canvas.height = height;\n return canvas;\n}\n","import { getLogger as clientGetLogger } from 'livekit-client';\n\nexport enum LogLevel {\n trace = 0,\n debug = 1,\n info = 2,\n warn = 3,\n error = 4,\n silent = 5,\n}\n\nexport enum LoggerNames {\n ProcessorWrapper = 'livekit-processor-wrapper',\n BackgroundProcessor = 'livekit-background-processor',\n WebGl = 'livekit-track-processor-web-gl',\n}\n\ntype LogLevelString = keyof typeof LogLevel;\n\nexport type StructuredLogger = ReturnType;\n\nlet livekitLogger = getLogger('livekit');\nconst livekitLoggers = Object.values(LoggerNames).map((name) => getLogger(name));\n\nlivekitLogger.setDefaultLevel(LogLevel.info);\n\nexport default livekitLogger as StructuredLogger;\n\n/**\n * @internal\n */\nexport function getLogger(name: string): StructuredLogger {\n return clientGetLogger(name);\n}\n\nexport function setLogLevel(level: LogLevel | LogLevelString, loggerName?: LoggerNames) {\n if (loggerName) {\n getLogger(loggerName).setLevel(level);\n } else {\n for (const logger of livekitLoggers) {\n logger.setLevel(level);\n }\n }\n}\n\nexport type LogExtension = (level: LogLevel, msg: string, context?: object) => void;\n\n/**\n * use this to hook into the logging function to allow sending internal livekit logs to third party services\n * if set, the browser logs will lose their stacktrace information (see https://github.com/pimterry/loglevel#writing-plugins)\n */\nexport function setLogExtension(extension: LogExtension, logger?: StructuredLogger) {\n const loggers = logger ? [logger] : livekitLoggers;\n\n loggers.forEach((logR) => {\n const originalFactory = logR.methodFactory;\n\n logR.methodFactory = (methodName, configLevel, loggerName) => {\n const rawMethod = originalFactory(methodName, configLevel, loggerName);\n\n const logLevel = LogLevel[methodName as LogLevelString];\n const needLog = logLevel >= configLevel && logLevel < LogLevel.silent;\n\n return (msg, context?: [msg: string, context: object]) => {\n if (context) rawMethod(msg, context);\n else rawMethod(msg);\n if (needLog) {\n extension(logLevel, msg, context);\n }\n };\n };\n logR.setLevel(logR.getLevel());\n });\n}\n","import { type ProcessorOptions, type Track, type TrackProcessor } from 'livekit-client';\nimport { TrackTransformer, TrackTransformerDestroyOptions } from './transformers';\nimport { createCanvas, waitForTrackResolution } from './utils';\nimport { LoggerNames, getLogger } from './logger';\n\ntype ProcessorWrapperLifecycleState = 'idle' | 'initializing' | 'running' | 'media-exhausted' | 'destroying' | 'destroyed';\n\nexport interface ProcessorWrapperOptions {\n /**\n * Maximum frame rate for fallback canvas.captureStream implementation\n * Default: 30\n */\n maxFps?: number;\n}\n\nexport default class ProcessorWrapper<\n TransformerOptions extends Record,\n Transformer extends TrackTransformer = TrackTransformer,\n>\n implements TrackProcessor\n{\n /**\n * Determines if the Processor is supported on the current browser\n */\n static get isSupported() {\n // Check for primary implementation support\n const hasStreamProcessor =\n typeof MediaStreamTrackGenerator !== 'undefined' &&\n typeof MediaStreamTrackProcessor !== 'undefined';\n\n // Check for fallback implementation support\n const hasFallbackSupport =\n typeof HTMLCanvasElement !== 'undefined' &&\n typeof VideoFrame !== 'undefined' &&\n 'captureStream' in HTMLCanvasElement.prototype;\n\n // We can work if either implementation is available\n return hasStreamProcessor || hasFallbackSupport;\n }\n\n /**\n * Determines if modern browser APIs are supported, which yield better performance\n */\n static get hasModernApiSupport() {\n return (\n typeof MediaStreamTrackGenerator !== 'undefined' &&\n typeof MediaStreamTrackProcessor !== 'undefined'\n );\n }\n\n name: string;\n\n source?: MediaStreamVideoTrack;\n\n processor?: MediaStreamTrackProcessor;\n\n trackGenerator?: MediaStreamTrackGenerator;\n\n canvas?: OffscreenCanvas | HTMLCanvasElement;\n\n displayCanvas?: HTMLCanvasElement;\n\n sourceDummy?: HTMLMediaElement;\n\n processedTrack?: MediaStreamTrack;\n\n transformer: Transformer;\n\n // For tracking whether we're using the stream API fallback\n private useStreamFallback = false;\n\n // For fallback rendering with canvas.captureStream()\n private capturedStream?: MediaStream;\n\n private animationFrameId?: number;\n\n private renderContext?: CanvasRenderingContext2D;\n\n private frameCallback?: (frame: VideoFrame) => void;\n\n private processingEnabled = false;\n\n // FPS control for fallback implementation\n private maxFps: number;\n\n private log = getLogger(LoggerNames.ProcessorWrapper);\n\n private lifecycleState: ProcessorWrapperLifecycleState = 'idle';\n\n constructor(\n transformer: Transformer,\n name: string,\n options: ProcessorWrapperOptions = {},\n ) {\n this.name = name;\n this.transformer = transformer;\n this.maxFps = options.maxFps ?? 30;\n }\n\n private async setup(opts: ProcessorOptions) {\n this.source = opts.track as MediaStreamVideoTrack;\n\n const { width, height } = await waitForTrackResolution(this.source);\n this.sourceDummy = opts.element;\n\n if (!(this.sourceDummy instanceof HTMLVideoElement)) {\n throw TypeError('Currently only video transformers are supported');\n }\n\n if (this.sourceDummy instanceof HTMLVideoElement) {\n this.sourceDummy.height = height ?? 300;\n this.sourceDummy.width = width ?? 300;\n }\n\n this.useStreamFallback = !ProcessorWrapper.hasModernApiSupport;\n\n if (this.useStreamFallback) {\n // Create a visible canvas for the fallback implementation or use an existing one if provided\n const existingCanvas = document.querySelector(\n 'canvas[data-livekit-processor=\"' + this.name + '\"]',\n ) as HTMLCanvasElement;\n\n if (existingCanvas) {\n this.displayCanvas = existingCanvas;\n this.displayCanvas.width = width ?? 300;\n this.displayCanvas.height = height ?? 300;\n } else {\n this.displayCanvas = document.createElement('canvas');\n this.displayCanvas.width = width ?? 300;\n this.displayCanvas.height = height ?? 300;\n this.displayCanvas.style.display = 'none';\n this.displayCanvas.dataset.livekitProcessor = this.name;\n document.body.appendChild(this.displayCanvas);\n }\n\n this.renderContext = this.displayCanvas.getContext('2d')!;\n this.capturedStream = this.displayCanvas.captureStream();\n this.canvas = createCanvas(width ?? 300, height ?? 300);\n } else {\n // Use MediaStreamTrackProcessor API\n this.processor = new MediaStreamTrackProcessor({ track: this.source });\n this.trackGenerator = new MediaStreamTrackGenerator({\n kind: 'video',\n signalTarget: this.source,\n });\n this.canvas = createCanvas(width ?? 300, height ?? 300);\n }\n }\n\n async init(opts: ProcessorOptions): Promise {\n this.log.debug('Init called');\n this.lifecycleState = 'initializing';\n await this.setup(opts);\n\n if (!this.canvas) {\n throw new TypeError('Expected canvas to be defined after setup');\n }\n\n await this.transformer.init({\n outputCanvas: this.canvas,\n inputElement: this.sourceDummy as HTMLVideoElement,\n });\n\n if (this.useStreamFallback) {\n this.initFallbackPath();\n } else {\n this.initStreamProcessorPath();\n }\n this.lifecycleState = 'running';\n }\n\n private initStreamProcessorPath() {\n if (!this.processor || !this.trackGenerator) {\n throw new TypeError(\n 'Expected processor and trackGenerator to be defined for stream processor path',\n );\n }\n\n const readableStream = this.processor.readable;\n const pipedStream = readableStream.pipeThrough(this.transformer!.transformer!);\n\n pipedStream\n .pipeTo(this.trackGenerator.writable)\n // if stream finishes, the media to process is exhausted\n .then(() => this.handleMediaExhausted())\n // destroy processor if stream errors - unless it's an abort error\n .catch((e) => {\n if (e instanceof DOMException && e.name === 'AbortError') {\n this.log.log('stream processor path aborted');\n } else if (e instanceof DOMException && e.name === 'InvalidStateError' && e.message === 'Stream closed') {\n this.log.log('stream processor underlying stream closed');\n this.handleMediaExhausted();\n } else {\n this.log.error('error when trying to pipe', e);\n this.destroy();\n }\n });\n\n this.processedTrack = this.trackGenerator as MediaStreamVideoTrack;\n }\n\n private initFallbackPath() {\n if (!this.capturedStream || !this.source || !this.canvas || !this.renderContext) {\n throw new TypeError('Missing required components for fallback implementation');\n }\n\n this.processedTrack = this.capturedStream.getVideoTracks()[0];\n this.processingEnabled = true;\n\n // Set up the frame callback for the transformer\n this.frameCallback = (frame: VideoFrame) => {\n if (!this.processingEnabled || !frame) {\n frame.close();\n return;\n }\n\n const controller = {\n enqueue: (processedFrame: VideoFrame) => {\n if (this.renderContext && this.displayCanvas) {\n // Draw the processed frame to the visible canvas\n this.renderContext.drawImage(\n processedFrame,\n 0,\n 0,\n this.displayCanvas.width,\n this.displayCanvas.height,\n );\n processedFrame.close();\n }\n },\n } as TransformStreamDefaultController;\n\n try {\n // Pass the frame through our transformer\n // @ts-ignore - The controller expects both VideoFrame & AudioData but we're only using VideoFrame\n this.transformer.transform(frame, controller);\n } catch (e) {\n this.log.error('Error in transform:', e);\n frame.close();\n }\n };\n\n // Start the rendering loop\n this.startRenderLoop();\n }\n\n private startRenderLoop() {\n if (!this.sourceDummy || !(this.sourceDummy instanceof HTMLVideoElement)) {\n this.handleMediaExhausted();\n return;\n }\n\n // Store the last processed timestamp to avoid duplicate processing\n let lastVideoTimestamp = -1;\n let lastFrameTime = 0;\n const videoElement = this.sourceDummy as HTMLVideoElement;\n const minFrameInterval = 1000 / this.maxFps; // Minimum time between frames\n\n // Estimate the video's native frame rate\n let estimatedVideoFps = this.maxFps;\n let frameTimeHistory: number[] = [];\n let lastVideoTimeChange = 0;\n let frameCount = 0;\n let lastFpsLog = 0;\n\n const renderLoop = () => {\n if (\n !this.processingEnabled ||\n !this.sourceDummy ||\n !(this.sourceDummy instanceof HTMLVideoElement)\n ) {\n this.handleMediaExhausted();\n return;\n }\n\n if (this.sourceDummy.paused) {\n this.log.warn('Video is paused, trying to play');\n this.sourceDummy.play().then(() => {\n this.animationFrameId = requestAnimationFrame(renderLoop);\n });\n return;\n }\n\n // Only process a new frame if the video has actually updated\n const videoTime = videoElement.currentTime;\n const now = performance.now();\n const timeSinceLastFrame = now - lastFrameTime;\n\n // Detect if video has a new frame\n const hasNewFrame = videoTime !== lastVideoTimestamp;\n\n // Update frame rate estimation if we have a new frame\n if (hasNewFrame) {\n if (lastVideoTimeChange > 0) {\n const timeBetweenFrames = now - lastVideoTimeChange;\n frameTimeHistory.push(timeBetweenFrames);\n\n // Keep a rolling window of the last 10 frame times\n if (frameTimeHistory.length > 10) {\n frameTimeHistory.shift();\n }\n\n // Calculate average frame interval\n if (frameTimeHistory.length > 2) {\n const avgFrameTime =\n frameTimeHistory.reduce((sum, time) => sum + time, 0) / frameTimeHistory.length;\n estimatedVideoFps = 1000 / avgFrameTime;\n\n // Log estimated FPS every 5 seconds in development environments\n // Use a simpler check that works in browsers without process.env\n const isDevelopment =\n (typeof window !== 'undefined' && window.location.hostname === 'localhost') ||\n window.location.hostname === '127.0.0.1';\n\n if (isDevelopment && now - lastFpsLog > 5000) {\n this.log.debug(\n `[${this.name}] Estimated video FPS: ${estimatedVideoFps.toFixed(\n 1,\n )}, Processing at: ${(frameCount / 5).toFixed(1)} FPS`,\n );\n frameCount = 0;\n lastFpsLog = now;\n }\n }\n }\n lastVideoTimeChange = now;\n }\n\n // Determine if we should process this frame\n // We'll process if:\n // 1. The video has a new frame\n // 2. Enough time has passed since last frame (respecting maxFps)\n const timeThresholdMet = timeSinceLastFrame >= minFrameInterval;\n\n if (hasNewFrame && timeThresholdMet) {\n lastVideoTimestamp = videoTime;\n lastFrameTime = now;\n frameCount++;\n\n try {\n // Create a VideoFrame from the video element\n if (videoElement.readyState >= HTMLMediaElement.HAVE_CURRENT_DATA) {\n const frame = new VideoFrame(videoElement);\n if (this.frameCallback) {\n this.frameCallback(frame);\n } else {\n frame.close();\n }\n }\n } catch (e) {\n this.log.error('Error in render loop:', e);\n }\n }\n this.animationFrameId = requestAnimationFrame(renderLoop);\n };\n\n this.animationFrameId = requestAnimationFrame(renderLoop);\n }\n\n async restart(opts: ProcessorOptions): Promise {\n this.log.debug('Restart called');\n await this.destroy({ willProcessorRestart: true });\n await this.init(opts);\n }\n\n async restartTransformer(...options: Parameters<(typeof this.transformer)['restart']>) {\n // @ts-ignore unclear why the restart method only accepts VideoTransformerInitOptions instead of either those or AudioTransformerInitOptions\n await this.transformer.restart(options[0]);\n }\n\n async updateTransformerOptions(...options: Parameters<(typeof this.transformer)['update']>) {\n await this.transformer.update(options[0]);\n }\n\n /** Called if the media pipeline no longer can read frames to process from the source media */\n private async handleMediaExhausted() {\n this.log.debug('Media was exhausted from source');\n if (this.lifecycleState !== 'running') {\n return;\n }\n this.lifecycleState = 'media-exhausted'\n await this.cleanup();\n }\n\n /** Tears down the media stack logic initialized in initStreamProcessorPath / initFallbackPath */\n private async cleanup() {\n if (this.useStreamFallback) {\n this.processingEnabled = false;\n if (this.animationFrameId) {\n cancelAnimationFrame(this.animationFrameId);\n this.animationFrameId = undefined;\n }\n if (this.displayCanvas && this.displayCanvas.parentNode) {\n this.displayCanvas.parentNode.removeChild(this.displayCanvas);\n }\n this.capturedStream?.getTracks().forEach((track) => track.stop());\n } else {\n // NOTE: closing writableControl below terminates the stream in initStreamProcessorPath /\n // calls the .then(...) which calls this.handleMediaExhausted\n await this.processor?.writableControl?.close();\n this.trackGenerator?.stop();\n }\n }\n\n async destroy(transformerDestroyOptions: TrackTransformerDestroyOptions = { willProcessorRestart: false }) {\n this.log.debug(`Destroy called - lifecycleState=${this.lifecycleState}, transformerDestroyOptions=${JSON.stringify(transformerDestroyOptions)}`);\n switch (this.lifecycleState) {\n case 'running':\n case 'media-exhausted':\n this.lifecycleState = 'destroying';\n\n await this.cleanup();\n\n await this.transformer.destroy(transformerDestroyOptions);\n this.lifecycleState = 'destroyed';\n break;\n\n default:\n break;\n }\n }\n}\n","import * as vision from '@mediapipe/tasks-vision';\nimport { getLogger, LoggerNames } from '../logger';\nimport { dependencies } from '../../package.json';\nimport VideoTransformer from './VideoTransformer';\nimport { TrackTransformerDestroyOptions, VideoTransformerInitOptions } from './types';\n\nexport type SegmenterOptions = Partial;\n\nexport interface FrameProcessingStats {\n processingTimeMs: number;\n segmentationTimeMs: number;\n filterTimeMs: number;\n}\n\nexport type BackgroundOptions = {\n blurRadius?: number;\n imagePath?: string;\n backgroundDisabled?: boolean;\n /** cannot be updated through the `update` method, needs a restart */\n segmenterOptions?: SegmenterOptions;\n /** cannot be updated through the `update` method, needs a restart */\n assetPaths?: { tasksVisionFileSet?: string; modelAssetPath?: string };\n /** called when a new frame is processed */\n onFrameProcessed?: (stats: FrameProcessingStats) => void;\n};\n\nexport default class BackgroundProcessor extends VideoTransformer {\n static get isSupported() {\n return (\n typeof OffscreenCanvas !== 'undefined' &&\n typeof VideoFrame !== 'undefined' &&\n typeof createImageBitmap !== 'undefined' &&\n !!document.createElement('canvas').getContext('webgl2')\n );\n }\n\n imageSegmenter?: vision.ImageSegmenter;\n\n segmentationResults: vision.ImageSegmenterResult | undefined;\n\n backgroundImageAndPath: { imageData: ImageBitmap, path: string } | null = null;\n\n options: BackgroundOptions;\n\n segmentationTimeMs: number = 0;\n\n isFirstFrame = true;\n\n private log = getLogger(LoggerNames.ProcessorWrapper);\n\n constructor(opts: BackgroundOptions) {\n super();\n this.options = opts;\n this.update(opts);\n }\n\n async init({ outputCanvas, inputElement: inputVideo }: VideoTransformerInitOptions) {\n // Initialize WebGL with appropriate options based on our current state\n\n await super.init({ outputCanvas, inputElement: inputVideo });\n\n const fileSet = await vision.FilesetResolver.forVisionTasks(\n this.options.assetPaths?.tasksVisionFileSet ??\n `https://cdn.jsdelivr.net/npm/@mediapipe/tasks-vision@${dependencies['@mediapipe/tasks-vision']}/wasm`,\n );\n\n this.imageSegmenter = await vision.ImageSegmenter.createFromOptions(fileSet, {\n baseOptions: {\n modelAssetPath:\n this.options.assetPaths?.modelAssetPath ??\n 'https://storage.googleapis.com/mediapipe-models/image_segmenter/selfie_segmenter/float16/latest/selfie_segmenter.tflite',\n delegate: 'GPU',\n ...this.options.segmenterOptions,\n },\n canvas: this.canvas,\n runningMode: 'VIDEO',\n outputCategoryMask: true,\n outputConfidenceMasks: false,\n });\n\n // Skip loading the image here if update already loaded the image below\n if (this.options?.imagePath) {\n await this.loadAndSetBackground(this.options.imagePath).catch((err) =>\n this.log.error('Error while loading processor background image: ', err),\n );\n }\n if (typeof this.options.blurRadius === 'number') {\n this.gl?.setBlurRadius(this.options.blurRadius);\n }\n this.gl?.setBackgroundDisabled(this.options.backgroundDisabled ?? false);\n }\n\n async destroy(options?: TrackTransformerDestroyOptions) {\n await super.destroy();\n await this.imageSegmenter?.close();\n this.backgroundImageAndPath = null;\n\n if (!options?.willProcessorRestart) {\n this.isFirstFrame = true;\n }\n }\n\n async loadAndSetBackground(path: string) {\n if (!this.backgroundImageAndPath || this.backgroundImageAndPath?.path !== path) {\n const img = new Image();\n\n await new Promise((resolve, reject) => {\n img.crossOrigin = 'Anonymous';\n img.onload = () => resolve(img);\n img.onerror = (err) => reject(err);\n img.src = path;\n });\n const imageData = await createImageBitmap(img);\n this.backgroundImageAndPath = { imageData, path };\n }\n this.gl?.setBackgroundImage(this.backgroundImageAndPath.imageData);\n }\n\n async transform(frame: VideoFrame, controller: TransformStreamDefaultController) {\n let enqueuedFrame = false;\n try {\n if (!(frame instanceof VideoFrame) || frame.codedWidth === 0 || frame.codedHeight === 0) {\n this.log.debug('empty frame detected, ignoring');\n return;\n }\n\n let skipProcessingFrame = this.isDisabled ?? this.options.backgroundDisabled ?? false;\n if (typeof this.options.blurRadius !== 'number' && typeof this.options.imagePath !== 'string') {\n skipProcessingFrame = true;\n }\n\n if (skipProcessingFrame) {\n controller.enqueue(frame);\n enqueuedFrame = true;\n return;\n }\n\n const frameTimeMs = Date.now();\n if (!this.canvas) {\n throw TypeError('Canvas needs to be initialized first');\n }\n this.canvas.width = frame.displayWidth;\n this.canvas.height = frame.displayHeight;\n\n // Render a copy of the first frame is rendered to the screen as soon as possible to act\n // as a less jarring initial state than a solid color while the synchronous work below\n // (segmentation + frame rendering) occurs.\n //\n // Ideally, these sync tasks could be offloaded to a webworker, but this is challenging\n // given WebGLTextures cannot be easily passed in a `postMessage`.\n if (this.isFirstFrame) {\n controller.enqueue(frame.clone());\n\n // Wait for the frame that was enqueued above to render before doing the sync work\n // below - otherwise, the sync work will take over the event loop and prevent the render\n // from occurring\n if (this.inputVideo) {\n await new Promise((resolve) => {\n this.inputVideo!.requestVideoFrameCallback((_now, e) => {\n const durationUntilFrameRenderedInMs = e.expectedDisplayTime - e.presentationTime;\n setTimeout(resolve, durationUntilFrameRenderedInMs);\n });\n });\n }\n }\n this.isFirstFrame = false;\n\n const filterStartTimeMs = performance.now();\n\n const segmentationPromise = new Promise((resolve, reject) => {\n try {\n let segmentationStartTimeMs = performance.now();\n // NOTE: this.imageSegmenter?.segmentForVideo is synchronous, and blocks the event loop\n // for tens to ~100 ms! The promise wrapper is just used to flatten out the call hierarchy.\n this.imageSegmenter?.segmentForVideo(frame, segmentationStartTimeMs, (result) => {\n this.segmentationTimeMs = performance.now() - segmentationStartTimeMs;\n this.segmentationResults = result;\n this.updateMask(result.categoryMask);\n result.close();\n resolve();\n });\n } catch (e) {\n reject(e);\n }\n });\n\n // NOTE: `this.drawFrame` is synchronous, and could take tens of ms to run!\n this.drawFrame(frame);\n if (this.canvas && this.canvas.width > 0 && this.canvas.height > 0) {\n const newFrame = new VideoFrame(this.canvas, {\n timestamp: frame.timestamp || frameTimeMs,\n });\n controller.enqueue(newFrame);\n const filterTimeMs = performance.now() - filterStartTimeMs;\n const stats: FrameProcessingStats = {\n processingTimeMs: this.segmentationTimeMs + filterTimeMs,\n segmentationTimeMs: this.segmentationTimeMs,\n filterTimeMs,\n };\n this.options.onFrameProcessed?.(stats);\n } else {\n controller.enqueue(frame);\n }\n await segmentationPromise;\n } catch (e) {\n this.log.error('Error while processing frame: ', e);\n } finally {\n if (!enqueuedFrame) {\n frame.close();\n }\n }\n }\n\n async update(opts: BackgroundOptions) {\n this.options = { ...this.options, ...opts };\n\n this.gl?.setBlurRadius(opts.blurRadius ?? null);\n if (opts.imagePath) {\n await this.loadAndSetBackground(opts.imagePath);\n } else {\n this.gl?.setBackgroundImage(null);\n }\n this.gl?.setBackgroundDisabled(opts.backgroundDisabled ?? false);\n }\n\n private async drawFrame(frame: VideoFrame) {\n if (!this.gl) return;\n this.gl?.renderFrame(frame);\n }\n\n private async updateMask(mask: vision.MPMask | undefined) {\n if (!mask) return;\n this.gl?.updateMask(mask.getAsWebGLTexture());\n }\n}\n","{\n \"name\": \"@livekit/track-processors\",\n \"version\": \"0.7.2\",\n \"description\": \"LiveKit track processors\",\n \"main\": \"dist/index.js\",\n \"module\": \"dist/index.mjs\",\n \"source\": \"src/index.ts\",\n \"types\": \"dist/src/index.d.ts\",\n \"repository\": {\n \"type\": \"git\",\n \"url\": \"https://github.com/livekit/track-processors-js.git\"\n },\n \"author\": \"Lukas Seiler\",\n \"license\": \"Apache-2.0\",\n \"scripts\": {\n \"build\": \"tsup --onSuccess \\\"tsc --declaration --emitDeclarationOnly\\\"\",\n \"build-sample\": \"cd example && vite build\",\n \"lint\": \"eslint src\",\n \"release\": \"pnpm build && changeset publish\",\n \"test\": \"jest\",\n \"dev\": \"vite example -c vite.config.mjs --open\",\n \"sample\": \"pnpm run dev\"\n },\n \"files\": [\n \"dist\",\n \"src\"\n ],\n \"dependencies\": {\n \"@mediapipe/tasks-vision\": \"0.10.14\"\n },\n \"peerDependencies\": {\n \"@types/dom-mediacapture-transform\": \"^0.1.9\",\n \"livekit-client\": \"^1.12.0 || ^2.1.0\"\n },\n \"devDependencies\": {\n \"@changesets/cli\": \"^2.26.2\",\n \"@livekit/changesets-changelog-github\": \"^0.0.4\",\n \"@trivago/prettier-plugin-sort-imports\": \"^4.2.1\",\n \"@types/offscreencanvas\": \"^2019.7.3\",\n \"@typescript-eslint/eslint-plugin\": \"^5.62.0\",\n \"eslint\": \"8.39.0\",\n \"eslint-config-airbnb-typescript\": \"17.0.0\",\n \"eslint-config-prettier\": \"8.8.0\",\n \"eslint-plugin-import\": \"2.27.5\",\n \"prettier\": \"^2.8.8\",\n \"tsup\": \"^7.2.0\",\n \"typescript\": \"^5.8.3\",\n \"vite\": \"^7.0.2\"\n },\n \"packageManager\": \"pnpm@9.15.9+sha512.68046141893c66fad01c079231128e9afb89ef87e2691d69e4d40eee228988295fd4682181bae55b58418c3a253bde65a505ec7c5f9403ece5cc3cd37dcf2531\"\n}\n","import { getLogger, LoggerNames} from '../logger';\n\nconst log = getLogger(LoggerNames.WebGl);\n\n/**\n * Initialize a WebGL texture\n */\nexport function initTexture(gl: WebGL2RenderingContext, texIndex: number) {\n const texRef = gl.TEXTURE0 + texIndex;\n gl.activeTexture(texRef);\n const texture = gl.createTexture();\n gl.bindTexture(gl.TEXTURE_2D, texture);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n gl.bindTexture(gl.TEXTURE_2D, texture);\n\n return texture;\n}\n\nexport function createShader(\n gl: WebGL2RenderingContext,\n type: number,\n source: string,\n): WebGLShader {\n const shader = gl.createShader(type)!;\n gl.shaderSource(shader, source);\n gl.compileShader(shader);\n if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {\n log.error('Shader compile failed:', gl.getShaderInfoLog(shader));\n gl.deleteShader(shader);\n throw new Error('Shader compile failed');\n }\n return shader;\n}\n\nexport function createProgram(\n gl: WebGL2RenderingContext,\n vs: WebGLShader,\n fs: WebGLShader,\n): WebGLProgram {\n const program = gl.createProgram()!;\n gl.attachShader(program, vs);\n gl.attachShader(program, fs);\n gl.linkProgram(program);\n if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {\n log.error('Program link failed:', gl.getProgramInfoLog(program));\n throw new Error('Program link failed');\n }\n return program;\n}\n\n/**\n * Create a WebGL framebuffer with the given texture as color attachment\n */\nexport function createFramebuffer(\n gl: WebGL2RenderingContext,\n texture: WebGLTexture,\n width: number,\n height: number,\n) {\n const framebuffer = gl.createFramebuffer();\n gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);\n\n // Set the texture as the color attachment\n gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);\n\n // Ensure texture dimensions match the provided width and height\n gl.bindTexture(gl.TEXTURE_2D, texture);\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);\n\n // Check if framebuffer is complete\n const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);\n if (status !== gl.FRAMEBUFFER_COMPLETE) {\n throw new Error('Framebuffer not complete');\n }\n\n gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n return framebuffer;\n}\n\n/**\n * Create a vertex buffer for a full-screen quad\n */\nexport function createVertexBuffer(gl: WebGL2RenderingContext): WebGLBuffer | null {\n const vertexBuffer = gl.createBuffer();\n gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);\n gl.bufferData(\n gl.ARRAY_BUFFER,\n new Float32Array([-1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1]),\n gl.STATIC_DRAW,\n );\n return vertexBuffer;\n}\n\n/**\n * Resizes and crops an image to cover a target canvas while maintaining aspect ratio\n * @param image The source image\n * @param targetWidth The target width\n * @param targetHeight The target height\n * @returns A cropped and resized ImageBitmap\n */\nexport async function resizeImageToCover(\n image: ImageBitmap,\n targetWidth: number,\n targetHeight: number,\n): Promise {\n // Calculate dimensions and crop for \"cover\" mode\n const imgAspect = image.width / image.height;\n const targetAspect = targetWidth / targetHeight;\n\n let sx = 0;\n let sy = 0;\n let sWidth = image.width;\n let sHeight = image.height;\n\n // For cover mode, we need to crop some parts of the image\n // to ensure it covers the canvas while maintaining aspect ratio\n if (imgAspect > targetAspect) {\n // Image is wider than target - crop the sides\n sWidth = Math.round(image.height * targetAspect);\n sx = Math.round((image.width - sWidth) / 2); // Center the crop horizontally\n } else if (imgAspect < targetAspect) {\n // Image is taller than target - crop the top/bottom\n sHeight = Math.round(image.width / targetAspect);\n sy = Math.round((image.height - sHeight) / 2); // Center the crop vertically\n }\n\n // Create a new ImageBitmap with the cropped portion\n return createImageBitmap(image, sx, sy, sWidth, sHeight, {\n resizeWidth: targetWidth,\n resizeHeight: targetHeight,\n resizeQuality: 'medium',\n });\n}\n\nlet emptyImageData: ImageData | undefined;\n\nfunction getEmptyImageData() {\n if (!emptyImageData) {\n emptyImageData = new ImageData(2, 2);\n emptyImageData.data[0] = 0;\n emptyImageData.data[1] = 0;\n emptyImageData.data[2] = 0;\n emptyImageData.data[3] = 0;\n }\n\n return emptyImageData;\n}\n\nconst glsl = (source: any) => source;\n\nexport { getEmptyImageData, glsl };\n","// Vertex shader source\nexport const vertexShaderSource = (flipY: boolean = true) => `#version 300 es\n in vec2 position;\n out vec2 texCoords;\n\n void main() {\n texCoords = (position + 1.0) / 2.0;\n texCoords.y = ${flipY ? '1.0 - texCoords.y' : 'texCoords.y'};\n gl_Position = vec4(position, 0, 1.0);\n }\n`;\n","import { createProgram, createShader, glsl } from '../utils';\nimport { vertexShaderSource } from './vertexShader';\n\n// Define the blur fragment shader\nexport const blurFragmentShader = glsl`#version 300 es\n precision mediump float;\n in vec2 texCoords;\n uniform sampler2D u_texture;\n uniform vec2 u_texelSize;\n uniform vec2 u_direction;\n uniform float u_radius;\n out vec4 fragColor;\n\n void main() {\n float sigma = u_radius;\n float twoSigmaSq = 2.0 * sigma * sigma;\n float totalWeight = 0.0;\n vec3 result = vec3(0.0);\n const int MAX_SAMPLES = 16;\n int radius = int(min(float(MAX_SAMPLES), ceil(u_radius)));\n\n for (int i = -MAX_SAMPLES; i <= MAX_SAMPLES; ++i) {\n float offset = float(i);\n if (abs(offset) > float(radius)) continue;\n float weight = exp(-(offset * offset) / twoSigmaSq);\n vec2 sampleCoord = texCoords + u_direction * u_texelSize * offset;\n result += texture(u_texture, sampleCoord).rgb * weight;\n totalWeight += weight;\n }\n\n fragColor = vec4(result / totalWeight, 1.0);\n }\n`;\n\nexport function createBlurProgram(gl: WebGL2RenderingContext) {\n const blurVertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource());\n const blurFrag = createShader(gl, gl.FRAGMENT_SHADER, blurFragmentShader);\n\n const blurProgram = createProgram(gl, blurVertexShader, blurFrag);\n\n // Get uniform locations\n const blurUniforms = {\n position: gl.getAttribLocation(blurProgram, 'position'),\n texture: gl.getUniformLocation(blurProgram, 'u_texture'),\n texelSize: gl.getUniformLocation(blurProgram, 'u_texelSize'),\n direction: gl.getUniformLocation(blurProgram, 'u_direction'),\n radius: gl.getUniformLocation(blurProgram, 'u_radius'),\n };\n\n return {\n program: blurProgram,\n shader: blurFrag,\n vertexShader: blurVertexShader,\n uniforms: blurUniforms,\n };\n}\n\nexport function applyBlur(\n gl: WebGL2RenderingContext,\n sourceTexture: WebGLTexture,\n width: number,\n height: number,\n blurRadius: number,\n blurProgram: WebGLProgram,\n blurUniforms: any,\n vertexBuffer: WebGLBuffer,\n processFramebuffers: WebGLFramebuffer[],\n processTextures: WebGLTexture[],\n) {\n gl.useProgram(blurProgram);\n\n // Set common attributes\n gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);\n gl.vertexAttribPointer(blurUniforms.position, 2, gl.FLOAT, false, 0, 0);\n gl.enableVertexAttribArray(blurUniforms.position);\n\n const texelWidth = 1.0 / width;\n const texelHeight = 1.0 / height;\n\n // First pass - horizontal blur\n gl.bindFramebuffer(gl.FRAMEBUFFER, processFramebuffers[0]);\n gl.viewport(0, 0, width, height);\n\n gl.activeTexture(gl.TEXTURE0);\n gl.bindTexture(gl.TEXTURE_2D, sourceTexture);\n gl.uniform1i(blurUniforms.texture, 0);\n gl.uniform2f(blurUniforms.texelSize, texelWidth, texelHeight);\n gl.uniform2f(blurUniforms.direction, 1.0, 0.0); // Horizontal\n gl.uniform1f(blurUniforms.radius, blurRadius);\n\n gl.drawArrays(gl.TRIANGLES, 0, 6);\n\n // Second pass - vertical blur\n gl.bindFramebuffer(gl.FRAMEBUFFER, processFramebuffers[1]);\n gl.viewport(0, 0, width, height);\n\n gl.activeTexture(gl.TEXTURE0);\n gl.bindTexture(gl.TEXTURE_2D, processTextures[0]);\n gl.uniform1i(blurUniforms.texture, 0);\n gl.uniform2f(blurUniforms.direction, 0.0, 1.0); // Vertical\n\n gl.drawArrays(gl.TRIANGLES, 0, 6);\n\n // Reset framebuffer\n gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n\n return processTextures[1];\n}\n","import { createProgram, createShader, glsl } from '../utils';\nimport { vertexShaderSource } from './vertexShader';\n\nexport const boxBlurFragmentShader = glsl`#version 300 es\nprecision mediump float;\n\nin vec2 texCoords;\n\nuniform sampler2D u_texture;\nuniform vec2 u_texelSize; // 1.0 / texture size\nuniform vec2 u_direction; // (1.0, 0.0) for horizontal, (0.0, 1.0) for vertical\nuniform float u_radius; // blur radius in texels\n\nout vec4 fragColor;\n\nvoid main() {\n vec3 sum = vec3(0.0);\n float count = 0.0;\n\n // Limit radius to avoid excessive loop cost\n const int MAX_RADIUS = 16;\n int radius = int(min(float(MAX_RADIUS), u_radius));\n\n for (int i = -MAX_RADIUS; i <= MAX_RADIUS; ++i) {\n if (abs(i) > radius) continue;\n\n vec2 offset = u_direction * u_texelSize * float(i);\n sum += texture(u_texture, texCoords + offset).rgb;\n count += 1.0;\n }\n\n fragColor = vec4(sum / count, 1.0);\n}\n`;\n\n/**\n * Create the box blur shader program\n */\nexport function createBoxBlurProgram(gl: WebGL2RenderingContext) {\n const vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource());\n const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, boxBlurFragmentShader);\n\n const program = createProgram(gl, vertexShader, fragmentShader);\n\n // Get attribute and uniform locations\n const uniforms = {\n position: gl.getAttribLocation(program, 'position'),\n texture: gl.getUniformLocation(program, 'u_texture'),\n texelSize: gl.getUniformLocation(program, 'u_texelSize'),\n direction: gl.getUniformLocation(program, 'u_direction'),\n radius: gl.getUniformLocation(program, 'u_radius'),\n };\n\n return {\n program,\n vertexShader,\n fragmentShader,\n uniforms,\n };\n}\n","import { createProgram, createShader, glsl } from '../utils';\nimport { vertexShaderSource } from './vertexShader';\n\n// Fragment shader source for compositing\nexport const compositeFragmentShader = glsl`#version 300 es\n precision mediump float;\n in vec2 texCoords;\n uniform sampler2D background;\n uniform bool disableBackground;\n uniform sampler2D frame;\n uniform sampler2D mask;\n out vec4 fragColor;\n \n void main() {\n vec4 frameTex = texture(frame, texCoords);\n\n if (disableBackground) {\n fragColor = frameTex;\n } else {\n vec4 bgTex = texture(background, texCoords);\n\n float maskVal = texture(mask, texCoords).r;\n\n // Compute screen-space gradient to detect edge sharpness\n float grad = length(vec2(dFdx(maskVal), dFdy(maskVal)));\n\n float edgeSoftness = 2.0; // higher = softer\n\n // Create a smooth edge around binary transition\n float smoothAlpha = smoothstep(0.5 - grad * edgeSoftness, 0.5 + grad * edgeSoftness, maskVal);\n\n // Optional: preserve frame alpha, or override as fully opaque\n vec4 blended = mix(bgTex, vec4(frameTex.rgb, 1.0), 1.0 - smoothAlpha);\n fragColor = blended;\n }\n \n }\n`;\n\n/**\n * Create the composite shader program\n */\nexport function createCompositeProgram(gl: WebGL2RenderingContext) {\n const vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource());\n const compositeShader = createShader(gl, gl.FRAGMENT_SHADER, compositeFragmentShader);\n\n const compositeProgram = createProgram(gl, vertexShader, compositeShader);\n\n // Get attribute and uniform locations\n const attribLocations = {\n position: gl.getAttribLocation(compositeProgram, 'position'),\n };\n\n const uniformLocations = {\n mask: gl.getUniformLocation(compositeProgram, 'mask')!,\n frame: gl.getUniformLocation(compositeProgram, 'frame')!,\n background: gl.getUniformLocation(compositeProgram, 'background')!,\n disableBackground: gl.getUniformLocation(compositeProgram, 'disableBackground')!,\n stepWidth: gl.getUniformLocation(compositeProgram, 'u_stepWidth')!,\n };\n\n return {\n program: compositeProgram,\n vertexShader,\n fragmentShader: compositeShader,\n attribLocations,\n uniformLocations,\n };\n}\n","import { createProgram, createShader } from '../utils';\n\nexport function createDownSampler(\n gl: WebGL2RenderingContext,\n width: number,\n height: number,\n): {\n framebuffer: WebGLFramebuffer;\n texture: WebGLTexture;\n program: WebGLProgram;\n uniforms: any;\n} {\n // Create texture\n const texture = gl.createTexture()!;\n gl.bindTexture(gl.TEXTURE_2D, texture);\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n\n // Create framebuffer\n const framebuffer = gl.createFramebuffer()!;\n gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);\n gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);\n\n // Create shader program for copying\n const vertexSource = `\n attribute vec2 position;\n varying vec2 v_uv;\n void main() {\n v_uv = (position + 1.0) * 0.5;\n gl_Position = vec4(position, 0.0, 1.0);\n }\n `;\n\n const fragmentSource = `\n precision mediump float;\n varying vec2 v_uv;\n uniform sampler2D u_texture;\n void main() {\n gl_FragColor = texture2D(u_texture, v_uv);\n }\n `;\n\n const vertShader = createShader(gl, gl.VERTEX_SHADER, vertexSource);\n const fragShader = createShader(gl, gl.FRAGMENT_SHADER, fragmentSource);\n const program = createProgram(gl, vertShader, fragShader);\n\n const uniforms = {\n texture: gl.getUniformLocation(program, 'u_texture'),\n position: gl.getAttribLocation(program, 'position'),\n };\n\n return {\n framebuffer,\n texture,\n program,\n uniforms,\n };\n}\n\nexport function applyDownsampling(\n gl: WebGL2RenderingContext,\n inputTexture: WebGLTexture,\n downSampler: {\n framebuffer: WebGLFramebuffer;\n texture: WebGLTexture;\n program: WebGLProgram;\n uniforms: any;\n },\n vertexBuffer: WebGLBuffer,\n width: number,\n height: number,\n): WebGLTexture {\n gl.useProgram(downSampler.program);\n\n gl.bindFramebuffer(gl.FRAMEBUFFER, downSampler.framebuffer);\n gl.viewport(0, 0, width, height);\n\n gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);\n gl.enableVertexAttribArray(downSampler.uniforms.position);\n gl.vertexAttribPointer(downSampler.uniforms.position, 2, gl.FLOAT, false, 0, 0);\n\n gl.activeTexture(gl.TEXTURE0);\n gl.bindTexture(gl.TEXTURE_2D, inputTexture);\n gl.uniform1i(downSampler.uniforms.texture, 0);\n\n gl.drawArrays(gl.TRIANGLES, 0, 6);\n\n gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n\n return downSampler.texture;\n}\n","/**\n * WebGL setup for the mask processor\n * potential improvements:\n * - downsample the video texture in background blur scenario before applying the (gaussian) blur for better performance\n *\n */\nimport { getLogger, LoggerNames} from '../logger';\nimport { applyBlur, createBlurProgram } from './shader-programs/blurShader';\nimport { createBoxBlurProgram } from './shader-programs/boxBlurShader';\nimport { createCompositeProgram } from './shader-programs/compositeShader';\nimport { applyDownsampling, createDownSampler } from './shader-programs/downSampler';\nimport {\n createFramebuffer,\n createVertexBuffer,\n getEmptyImageData,\n initTexture,\n resizeImageToCover,\n} from './utils';\n\nconst log = getLogger(LoggerNames.WebGl);\n\nexport const setupWebGL = (canvas: OffscreenCanvas | HTMLCanvasElement) => {\n const gl = canvas.getContext('webgl2', {\n antialias: true,\n premultipliedAlpha: true,\n }) as WebGL2RenderingContext;\n\n let blurRadius: number | null = null;\n let maskBlurRadius: number | null = 8;\n const downsampleFactor = 4;\n\n if (!gl) {\n log.error('Failed to create WebGL context');\n return undefined;\n }\n\n gl.enable(gl.BLEND);\n gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);\n\n // Create the composite program\n const composite = createCompositeProgram(gl);\n const compositeProgram = composite.program;\n const positionLocation = composite.attribLocations.position;\n const {\n mask: maskTextureLocation,\n frame: frameTextureLocation,\n background: bgTextureLocation,\n disableBackground: disableBackgroundLocation,\n } = composite.uniformLocations;\n\n // Create the blur program using the same vertex shader source\n const blur = createBlurProgram(gl);\n const blurProgram = blur.program;\n const blurUniforms = blur.uniforms;\n\n // Create the box blur program\n const boxBlur = createBoxBlurProgram(gl);\n const boxBlurProgram = boxBlur.program;\n const boxBlurUniforms = boxBlur.uniforms;\n\n const bgTexture = initTexture(gl, 0);\n const frameTexture = initTexture(gl, 1);\n const vertexBuffer = createVertexBuffer(gl);\n\n if (!vertexBuffer) {\n throw new Error('Failed to create vertex buffer');\n }\n\n // Create additional textures and framebuffers for processing\n let bgBlurTextures: WebGLTexture[] = [];\n let bgBlurFrameBuffers: WebGLFramebuffer[] = [];\n let blurredMaskTexture: WebGLTexture | null = null;\n\n // For double buffering the final mask\n let finalMaskTextures: WebGLTexture[] = [];\n let readMaskIndex = 0; // Index for renderFrame to read from\n let writeMaskIndex = 1; // Index for updateMask to write to\n\n // Create textures for background processing (blur)\n bgBlurTextures.push(initTexture(gl, 3)); // For blur pass 1\n bgBlurTextures.push(initTexture(gl, 4)); // For blur pass 2\n\n const bgBlurTextureWidth = Math.floor(canvas.width / downsampleFactor);\n const bgBlurTextureHeight = Math.floor(canvas.height / downsampleFactor);\n\n const downSampler = createDownSampler(gl, bgBlurTextureWidth, bgBlurTextureHeight);\n\n // Create framebuffers for background processing\n bgBlurFrameBuffers.push(\n createFramebuffer(gl, bgBlurTextures[0], bgBlurTextureWidth, bgBlurTextureHeight),\n );\n bgBlurFrameBuffers.push(\n createFramebuffer(gl, bgBlurTextures[1], bgBlurTextureWidth, bgBlurTextureHeight),\n );\n\n // Initialize texture for the first mask blur pass\n const tempMaskTexture = initTexture(gl, 5);\n const tempMaskFrameBuffer = createFramebuffer(gl, tempMaskTexture, canvas.width, canvas.height);\n\n // Initialize two textures for double-buffering the final mask\n finalMaskTextures.push(initTexture(gl, 6)); // For reading in renderFrame\n finalMaskTextures.push(initTexture(gl, 7)); // For writing in updateMask\n\n // Create framebuffers for the final mask textures\n const finalMaskFrameBuffers = [\n createFramebuffer(gl, finalMaskTextures[0], canvas.width, canvas.height),\n createFramebuffer(gl, finalMaskTextures[1], canvas.width, canvas.height),\n ];\n\n let backgroundImageDisabled = false;\n\n // Set up uniforms for the composite shader\n gl.useProgram(compositeProgram);\n gl.uniform1i(disableBackgroundLocation, backgroundImageDisabled ? 1 : 0);\n gl.uniform1i(bgTextureLocation, 0);\n gl.uniform1i(frameTextureLocation, 1);\n gl.uniform1i(maskTextureLocation, 2);\n\n // Store custom background image\n let customBackgroundImage: ImageBitmap | ImageData | null = null;\n\n function renderFrame(frame: VideoFrame) {\n if (frame.codedWidth === 0 || finalMaskTextures.length === 0) {\n return;\n }\n\n const width = frame.displayWidth;\n const height = frame.displayHeight;\n\n // Prepare frame texture\n gl.activeTexture(gl.TEXTURE1);\n gl.bindTexture(gl.TEXTURE_2D, frameTexture);\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, frame);\n\n // Apply blur if enabled (and no custom background is set)\n let backgroundTexture = bgTexture;\n\n if (blurRadius) {\n const downSampledFrameTexture = applyDownsampling(\n gl,\n frameTexture,\n downSampler,\n vertexBuffer!,\n bgBlurTextureWidth,\n bgBlurTextureHeight,\n );\n backgroundTexture = applyBlur(\n gl,\n downSampledFrameTexture,\n bgBlurTextureWidth,\n bgBlurTextureHeight,\n blurRadius,\n blurProgram,\n blurUniforms,\n vertexBuffer!,\n bgBlurFrameBuffers,\n bgBlurTextures,\n );\n } else if (customBackgroundImage) {\n gl.activeTexture(gl.TEXTURE0);\n gl.bindTexture(gl.TEXTURE_2D, bgTexture);\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, customBackgroundImage);\n backgroundTexture = bgTexture;\n }\n\n // Render the final composite\n gl.viewport(0, 0, width, height);\n gl.clearColor(1.0, 1.0, 1.0, 1.0);\n gl.clear(gl.COLOR_BUFFER_BIT);\n\n gl.useProgram(compositeProgram);\n gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);\n gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0);\n gl.enableVertexAttribArray(positionLocation);\n\n // Set background texture (either original, blurred or custom)\n gl.activeTexture(gl.TEXTURE0);\n gl.bindTexture(gl.TEXTURE_2D, backgroundTexture);\n gl.uniform1i(bgTextureLocation, 0);\n gl.uniform1i(disableBackgroundLocation, backgroundImageDisabled ? 1 : 0);\n\n // Set frame texture\n gl.activeTexture(gl.TEXTURE1);\n gl.bindTexture(gl.TEXTURE_2D, frameTexture);\n gl.uniform1i(frameTextureLocation, 1);\n\n // Set mask texture - always read from the current read index\n gl.activeTexture(gl.TEXTURE2);\n gl.bindTexture(gl.TEXTURE_2D, finalMaskTextures[readMaskIndex]);\n gl.uniform1i(maskTextureLocation, 2);\n gl.drawArrays(gl.TRIANGLES, 0, 6);\n }\n\n /**\n * Set or update the background image\n * @param image The background image to use, or null to clear\n */\n async function setBackgroundImage(image: ImageBitmap | null) {\n // Clear existing background\n customBackgroundImage = null;\n\n if (image) {\n customBackgroundImage = getEmptyImageData();\n try {\n // Resize and crop the image to cover the canvas\n const croppedImage = await resizeImageToCover(image, canvas.width, canvas.height);\n\n // Store the cropped and resized image\n customBackgroundImage = croppedImage;\n } catch (error) {\n log.error(\n 'Error processing background image, falling back to black background:',\n error,\n );\n }\n\n gl.activeTexture(gl.TEXTURE0);\n gl.bindTexture(gl.TEXTURE_2D, bgTexture);\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, customBackgroundImage);\n }\n }\n\n function setBlurRadius(radius: number | null) {\n blurRadius = radius ? Math.max(1, Math.floor(radius / downsampleFactor)) : null; // we are downsampling the blur texture, so decrease the radius here for better performance with a similar visual result\n setBackgroundImage(null);\n }\n\n function setBackgroundDisabled(disabled: boolean) {\n backgroundImageDisabled = disabled;\n }\n\n function updateMask(mask: WebGLTexture) {\n // Use the existing applyBlur function to apply the first blur pass\n // The second blur pass will be written to finalMaskTextures[writeMaskIndex]\n\n // Create temporary arrays for the single blur operation\n const tempFramebuffers = [tempMaskFrameBuffer, finalMaskFrameBuffers[writeMaskIndex]];\n\n const tempTextures = [tempMaskTexture, finalMaskTextures[writeMaskIndex]];\n\n // Apply the blur using the existing function\n applyBlur(\n gl,\n mask,\n canvas.width,\n canvas.height,\n maskBlurRadius || 1.0,\n boxBlurProgram,\n boxBlurUniforms,\n vertexBuffer!,\n tempFramebuffers,\n tempTextures,\n );\n\n // Swap indices for the next frame\n readMaskIndex = writeMaskIndex;\n writeMaskIndex = 1 - writeMaskIndex;\n }\n\n function cleanup() {\n gl.deleteProgram(compositeProgram);\n gl.deleteProgram(blurProgram);\n gl.deleteProgram(boxBlurProgram);\n gl.deleteTexture(bgTexture);\n gl.deleteTexture(frameTexture);\n gl.deleteTexture(tempMaskTexture);\n gl.deleteFramebuffer(tempMaskFrameBuffer);\n\n for (const texture of bgBlurTextures) {\n gl.deleteTexture(texture);\n }\n for (const framebuffer of bgBlurFrameBuffers) {\n gl.deleteFramebuffer(framebuffer);\n }\n for (const texture of finalMaskTextures) {\n gl.deleteTexture(texture);\n }\n for (const framebuffer of finalMaskFrameBuffers) {\n gl.deleteFramebuffer(framebuffer);\n }\n gl.deleteBuffer(vertexBuffer);\n\n if (blurredMaskTexture) {\n gl.deleteTexture(blurredMaskTexture);\n }\n\n if (downSampler) {\n gl.deleteTexture(downSampler.texture);\n gl.deleteFramebuffer(downSampler.framebuffer);\n gl.deleteProgram(downSampler.program);\n }\n\n // Release any ImageBitmap resources\n if (customBackgroundImage) {\n if (customBackgroundImage instanceof ImageBitmap) {\n customBackgroundImage.close();\n }\n customBackgroundImage = null;\n }\n bgBlurTextures = [];\n bgBlurFrameBuffers = [];\n finalMaskTextures = [];\n }\n\n return { renderFrame, updateMask, setBackgroundImage, setBlurRadius, setBackgroundDisabled, cleanup };\n};\n","import { createCanvas } from '../utils';\nimport { setupWebGL } from '../webgl/index';\nimport { VideoTrackTransformer, VideoTransformerInitOptions } from './types';\n\nexport default abstract class VideoTransformer>\n implements VideoTrackTransformer\n{\n transformer?: TransformStream;\n\n canvas?: OffscreenCanvas | HTMLCanvasElement;\n\n // ctx?: OffscreenCanvasRenderingContext2D;\n\n inputVideo?: HTMLVideoElement;\n\n gl?: ReturnType;\n\n protected isDisabled?: boolean = false;\n\n async init({\n outputCanvas,\n inputElement: inputVideo,\n }: VideoTransformerInitOptions): Promise {\n if (!(inputVideo instanceof HTMLVideoElement)) {\n throw TypeError('Video transformer needs a HTMLVideoElement as input');\n }\n\n this.transformer = new TransformStream({\n transform: (frame, controller) => this.transform(frame, controller),\n });\n this.canvas = outputCanvas || null;\n if (outputCanvas) {\n // this.ctx = this.canvas?.getContext('2d') || undefined;\n this.gl = setupWebGL(\n this.canvas || createCanvas(inputVideo.videoWidth, inputVideo.videoHeight),\n );\n }\n this.inputVideo = inputVideo;\n this.isDisabled = false;\n }\n\n async restart({ outputCanvas, inputElement: inputVideo }: VideoTransformerInitOptions) {\n this.canvas = outputCanvas || null;\n this.gl?.cleanup();\n this.gl = setupWebGL(\n this.canvas || createCanvas(inputVideo.videoWidth, inputVideo.videoHeight),\n );\n\n this.inputVideo = inputVideo;\n this.isDisabled = false;\n }\n\n async destroy() {\n this.isDisabled = true;\n this.canvas = undefined;\n this.gl?.cleanup();\n this.gl = undefined;\n }\n\n abstract transform(\n frame: 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'legacy';\n }\n\n async switchTo(options: SwitchBackgroundProcessorOptions) {\n switch (options.mode) {\n case 'background-blur':\n await this.updateTransformerOptions({\n imagePath: undefined,\n blurRadius: options.blurRadius ?? DEFAULT_BLUR_RADIUS,\n backgroundDisabled: false,\n });\n break;\n case 'virtual-background':\n await this.updateTransformerOptions({\n imagePath: options.imagePath,\n blurRadius: undefined,\n backgroundDisabled: false,\n });\n break;\n case 'disabled':\n await this.updateTransformerOptions({ imagePath: undefined, backgroundDisabled: true });\n break;\n }\n }\n}\n\n/**\n * Instantiates a background processor that supports blurring the background of a user's local\n * video or replacing the user's background with a virtual background image, and supports switching\n * the active mode later on the fly to avoid visual artifacts.\n *\n * @example\n * const camTrack = currentRoom.localParticipant.getTrackPublication(Track.Source.Camera)!.track as LocalVideoTrack;\n * const processor = BackgroundProcessor({ mode: 'background-blur', blurRadius: 10 });\n * camTrack.setProcessor(processor);\n *\n * // Change to background image:\n * processor.switchToVirtualBackground('path/to/image.png');\n * // Change back to background blur:\n * processor.switchToBackgroundBlur(10);\n */\nexport const BackgroundProcessor = (\n options: BackgroundProcessorOptions,\n name = 'background-processor',\n) => {\n const isTransformerSupported = BackgroundTransformer.isSupported;\n const isProcessorSupported = ProcessorWrapper.isSupported;\n\n if (!isTransformerSupported) {\n throw new Error('Background transformer is not supported in this browser');\n }\n\n if (!isProcessorSupported) {\n throw new Error(\n 'Neither MediaStreamTrackProcessor nor canvas.captureStream() fallback is supported in this browser',\n );\n }\n\n // Extract transformer-specific options and processor options\n let transformer, processorOpts;\n switch (options.mode) {\n case 'background-blur': {\n const {\n // eslint-disable-next-line no-unused-vars\n mode,\n blurRadius = DEFAULT_BLUR_RADIUS,\n segmenterOptions,\n assetPaths,\n onFrameProcessed,\n ...rest\n } = options;\n\n processorOpts = rest;\n transformer = new 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break;\n }\n }\n\n const processor = new BackgroundProcessorWrapper(transformer, name, processorOpts);\n\n return processor;\n};\n\n/**\n * Instantiates a background processor that is configured in blur mode.\n * @deprecated Use `BackgroundProcessor({ mode: 'background-blur', blurRadius: 10, ... })` instead.\n */\nexport const BackgroundBlur = (\n blurRadius: number = DEFAULT_BLUR_RADIUS,\n segmenterOptions?: SegmenterOptions,\n onFrameProcessed?: (stats: FrameProcessingStats) => void,\n processorOptions?: ProcessorWrapperOptions,\n) => {\n return BackgroundProcessor(\n {\n blurRadius,\n segmenterOptions,\n onFrameProcessed,\n ...processorOptions,\n },\n 'background-blur',\n );\n};\n\n/**\n * Instantiates a background processor that is configured in virtual background mode.\n * @deprecated Use `BackgroundProcessor({ mode: 'virtual-background', imagePath: '...', ... })` instead.\n */\nexport const VirtualBackground = (\n imagePath: string,\n segmenterOptions?: SegmenterOptions,\n 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