{"version":3,"sources":["../../src/voice/background_audio.ts","../../../node_modules/.pnpm/tsup@8.4.0_@microsoft+api-extractor@7.58.12_@types+node@22.19.1__postcss@8.5.23_tsx@4.23.1_typescript@5.9.3/node_modules/tsup/assets/cjs_shims.js"],"sourcesContent":["// SPDX-FileCopyrightText: 2025 LiveKit, Inc.\n//\n// SPDX-License-Identifier: Apache-2.0\nimport {\n AudioFrame,\n AudioMixer,\n AudioSource,\n LocalAudioTrack,\n type LocalTrackPublication,\n type Room,\n TrackPublishOptions,\n} from '@livekit/rtc-node';\nimport { dirname, join } from 'node:path';\nimport { fileURLToPath } from 'node:url';\nimport { audioFramesFromFile, loopAudioFramesFromFile } from '../audio.js';\nimport { log } from '../log.js';\nimport { Future, Task, cancelAndWait } from '../utils.js';\nimport type { AgentSession } from './agent_session.js';\nimport { AgentSessionEventTypes, type AgentStateChangedEvent } from './events.js';\n\nconst TASK_TIMEOUT_MS = 500;\n\nexport enum BuiltinAudioClip {\n HOLD_MUSIC = 'hold_music.ogg',\n OFFICE_AMBIENCE = 'office-ambience.ogg',\n KEYBOARD_TYPING = 'keyboard-typing.ogg',\n KEYBOARD_TYPING2 = 'keyboard-typing2.ogg',\n}\n\nexport function isBuiltinAudioClip(\n source: AudioSourceType | AudioConfig | AudioConfig[],\n): source is BuiltinAudioClip {\n return (\n typeof source === 'string' &&\n Object.values(BuiltinAudioClip).includes(source as BuiltinAudioClip)\n );\n}\n\nexport function getBuiltinAudioPath(clip: BuiltinAudioClip): string {\n const resourcesPath = join(dirname(fileURLToPath(import.meta.url)), '../../resources');\n return join(resourcesPath, clip);\n}\n\nexport type AudioSourceType = string | BuiltinAudioClip | AsyncIterable;\n\nexport interface AudioConfig {\n source: AudioSourceType;\n volume?: number;\n probability?: number;\n}\n\nexport interface BackgroundAudioPlayerOptions {\n /**\n * Ambient sound to play continuously in the background.\n * Can be a file path, BuiltinAudioClip, or AudioConfig.\n * File paths will be looped automatically.\n */\n ambientSound?: AudioSourceType | AudioConfig | AudioConfig[];\n\n /**\n * Sound to play when the agent is thinking.\n * Plays when agent state changes to 'thinking' and stops when it changes to other states.\n */\n thinkingSound?: AudioSourceType | AudioConfig | AudioConfig[];\n\n /**\n * Stream timeout in milliseconds for the audio mixer.\n * Controls how long the mixer waits for a stream to produce data before timing out.\n * Higher values are more tolerant of network latency and processing delays.\n * @defaultValue 2000\n */\n streamTimeoutMs?: number;\n}\n\nexport interface BackgroundAudioStartOptions {\n room: Room;\n agentSession?: AgentSession;\n trackPublishOptions?: TrackPublishOptions;\n}\n\n// Queue size for AudioSource buffer (400ms)\n// Kept small to avoid abrupt cutoffs when removing sounds\nconst AUDIO_SOURCE_BUFFER_MS = 400;\nconst STREAM_TIMEOUT_MS = 2000;\nconst BACKGROUND_AUDIO_TRACK_NAME = 'background_audio';\n\nexport class PlayHandle {\n private doneFuture = new Future();\n private stopFuture = new Future();\n\n done(): boolean {\n return this.doneFuture.done;\n }\n\n stop(): void {\n if (this.done()) return;\n\n if (!this.stopFuture.done) {\n this.stopFuture.resolve();\n }\n\n this._markPlayoutDone();\n }\n\n async waitForPlayout(): Promise {\n return this.doneFuture.await;\n }\n\n _markPlayoutDone(): void {\n if (!this.doneFuture.done) {\n this.doneFuture.resolve();\n }\n }\n}\n\n/**\n * Manages background audio playback for LiveKit agent sessions\n *\n * This class handles playing ambient sounds and manages audio track publishing.\n * It supports:\n * - Continuous ambient sound playback with looping\n * - Thinking sound playback during agent processing\n * - Multiple simultaneous audio streams via AudioMixer\n * - Volume control and probability-based sound selection\n * - Integration with LiveKit rooms and agent sessions\n *\n * @example\n * ```typescript\n * const player = new BackgroundAudioPlayer({\n * ambientSound: { source: BuiltinAudioClip.OFFICE_AMBIENCE, volume: 0.8 },\n * thinkingSound: { source: BuiltinAudioClip.KEYBOARD_TYPING, volume: 0.6 },\n * });\n *\n * await player.start({ room, agentSession });\n * ```\n */\nexport class BackgroundAudioPlayer {\n private ambientSound?: AudioSourceType | AudioConfig | AudioConfig[];\n private thinkingSound?: AudioSourceType | AudioConfig | AudioConfig[];\n private streamTimeoutMs: number;\n\n private playTasks: Task[] = [];\n private audioSource = new AudioSource(48000, 1, AUDIO_SOURCE_BUFFER_MS);\n private audioMixer: AudioMixer;\n private mixerTask?: Task;\n\n private room?: Room;\n private agentSession?: AgentSession;\n private publication?: LocalTrackPublication;\n private trackPublishOptions?: TrackPublishOptions;\n\n private ambientHandle?: PlayHandle;\n private thinkingHandle?: PlayHandle;\n\n private closed = true;\n\n // TODO (Brian): add lock\n\n #logger = log();\n\n constructor(options?: BackgroundAudioPlayerOptions) {\n const { ambientSound, thinkingSound, streamTimeoutMs = STREAM_TIMEOUT_MS } = options || {};\n\n this.ambientSound = ambientSound;\n this.thinkingSound = thinkingSound;\n this.streamTimeoutMs = streamTimeoutMs;\n\n this.audioMixer = new AudioMixer(48000, 1, {\n blocksize: 4800, // 100ms at 48kHz\n capacity: 1,\n streamTimeoutMs: this.streamTimeoutMs,\n });\n }\n\n /**\n * Select a sound from a list of background sound based on probability weights\n * Return undefined if no sound is selected (when sum of probabilities < 1.0).\n */\n private selectSoundFromList(sounds: AudioConfig[]): AudioConfig | undefined {\n const totalProbability = sounds.reduce((sum, sound) => sum + (sound.probability ?? 1.0), 0);\n\n if (totalProbability <= 0) {\n return undefined;\n }\n\n if (totalProbability < 1.0 && Math.random() > totalProbability) {\n return undefined;\n }\n\n const normalizeFactor = totalProbability <= 1.0 ? 1.0 : totalProbability;\n const r = Math.random() * Math.min(totalProbability, 1.0);\n let cumulative = 0.0;\n\n for (const sound of sounds) {\n const prob = sound.probability ?? 1.0;\n if (prob <= 0) {\n continue;\n }\n\n const normProb = prob / normalizeFactor;\n cumulative += normProb;\n\n if (r <= cumulative) {\n return sound;\n }\n }\n\n return sounds[sounds.length - 1];\n }\n\n private normalizeSoundSource(\n source?: AudioSourceType | AudioConfig | AudioConfig[],\n ): { source: AudioSourceType; volume: number } | undefined {\n if (source === undefined) {\n return undefined;\n }\n\n if (typeof source === 'string') {\n return {\n source: this.normalizeBuiltinAudio(source),\n volume: 1.0,\n };\n }\n\n if (Array.isArray(source)) {\n const selected = this.selectSoundFromList(source);\n if (selected === undefined) {\n return undefined;\n }\n\n return {\n source: selected.source,\n volume: selected.volume ?? 1.0,\n };\n }\n\n if (typeof source === 'object' && 'source' in source) {\n return {\n source: this.normalizeBuiltinAudio(source.source),\n volume: source.volume ?? 1.0,\n };\n }\n\n return { source, volume: 1.0 };\n }\n\n private normalizeBuiltinAudio(source: AudioSourceType): AudioSourceType {\n if (isBuiltinAudioClip(source)) {\n return getBuiltinAudioPath(source);\n }\n return source;\n }\n\n play(audio: AudioSourceType | AudioConfig | AudioConfig[], loop = false): PlayHandle {\n const normalized = this.normalizeSoundSource(audio);\n if (normalized === undefined) {\n const handle = new PlayHandle();\n handle._markPlayoutDone();\n return handle;\n }\n\n const { source, volume } = normalized;\n const playHandle = new PlayHandle();\n\n const task = Task.from(async ({ signal }) => {\n await this.playTask({ playHandle, sound: source, volume, loop, signal });\n });\n\n task.addDoneCallback(() => {\n playHandle._markPlayoutDone();\n this.playTasks.splice(this.playTasks.indexOf(task), 1);\n });\n\n this.playTasks.push(task);\n return playHandle;\n }\n\n /**\n * Start the background audio system, publishing the audio track\n * and beginning playback of any configured ambient sound.\n *\n * If `ambientSound` is provided (and contains file paths), they will loop\n * automatically. If `ambientSound` contains AsyncIterators, they are assumed\n * to be already infinite or looped.\n *\n * @param options - Options for starting background audio playback\n */\n async start(options: BackgroundAudioStartOptions): Promise {\n const { room, agentSession, trackPublishOptions } = options;\n this.room = room;\n this.agentSession = agentSession;\n this.trackPublishOptions = trackPublishOptions;\n\n this.closed = false;\n\n await this.publishTrack();\n\n // TODO (Brian): check job context is not fake\n\n this.mixerTask = Task.from(async () => {\n try {\n await this.runMixerTask();\n } catch (err) {\n if (this.closed) return; // expected when AudioSource is closed\n throw err;\n }\n });\n\n this.agentSession?.on(AgentSessionEventTypes.AgentStateChanged, this.onAgentStateChanged);\n if (!this.ambientSound) return;\n\n const normalized = this.normalizeSoundSource(this.ambientSound);\n if (!normalized) return;\n\n const { source, volume } = normalized;\n const selectedSound: AudioConfig = { source, volume, probability: 1.0 };\n this.ambientHandle = this.play(selectedSound, typeof source === 'string');\n }\n\n /**\n * Close and cleanup the background audio system\n */\n async close(): Promise {\n this.closed = true;\n\n await cancelAndWait(this.playTasks, TASK_TIMEOUT_MS);\n\n await this.audioMixer.aclose();\n await this.audioSource.close();\n\n if (this.mixerTask) {\n await this.mixerTask.cancelAndWait(TASK_TIMEOUT_MS);\n }\n\n this.agentSession?.off(AgentSessionEventTypes.AgentStateChanged, this.onAgentStateChanged);\n\n // The cached publication SID may be stale if the SDK auto-republished it\n // during a full reconnect, so resolve the current publication by track\n // name before unpublishing.\n const current = this.findCurrentPublication();\n if (current && current.sid) {\n await this.room?.localParticipant?.unpublishTrack(current.sid);\n }\n }\n\n private findCurrentPublication(): LocalTrackPublication | undefined {\n const pubs = this.room?.localParticipant?.trackPublications;\n if (!pubs) return undefined;\n for (const pub of pubs.values()) {\n if (pub.name === BACKGROUND_AUDIO_TRACK_NAME) return pub;\n }\n return undefined;\n }\n\n /**\n * Get the current track publication\n */\n getPublication(): LocalTrackPublication | undefined {\n return this.findCurrentPublication() ?? this.publication;\n }\n\n private async publishTrack(): Promise {\n if (this.publication !== undefined) {\n return;\n }\n\n const track = LocalAudioTrack.createAudioTrack(BACKGROUND_AUDIO_TRACK_NAME, this.audioSource);\n\n if (this.room?.localParticipant === undefined) {\n throw new Error('Local participant not available');\n }\n\n const publication = await this.room.localParticipant.publishTrack(\n track,\n this.trackPublishOptions ?? new TrackPublishOptions(),\n );\n\n this.publication = publication;\n this.#logger.debug(`Background audio track published: ${this.publication.sid}`);\n }\n\n private async runMixerTask(): Promise {\n for await (const frame of this.audioMixer) {\n await this.audioSource.captureFrame(frame);\n }\n }\n\n private onAgentStateChanged = (ev: AgentStateChangedEvent): void => {\n if (!this.thinkingSound) {\n return;\n }\n\n if (ev.newState === 'thinking') {\n if (this.thinkingHandle && !this.thinkingHandle.done()) {\n return;\n }\n\n const normalized = this.normalizeSoundSource(this.thinkingSound);\n if (normalized) {\n const { source, volume } = normalized;\n const selectedSound: AudioConfig = { source, volume, probability: 1.0 };\n // Loop thinking sound while in thinking state (same as ambient)\n this.thinkingHandle = this.play(selectedSound, typeof source === 'string');\n }\n } else {\n this.thinkingHandle?.stop();\n }\n };\n\n // Note: Python uses numpy, TS uses typed arrays for equivalent logic\n private applyVolumeToFrame(frame: AudioFrame, volume: number): AudioFrame {\n const int16Data = new Int16Array(\n frame.data.buffer,\n frame.data.byteOffset,\n frame.data.byteLength / 2,\n );\n const float32Data = new Float32Array(int16Data.length);\n\n for (let i = 0; i < int16Data.length; i++) {\n float32Data[i] = int16Data[i]!;\n }\n\n const volumeFactor = 10 ** Math.log10(volume);\n for (let i = 0; i < float32Data.length; i++) {\n float32Data[i]! *= volumeFactor;\n }\n\n const outputData = new Int16Array(float32Data.length);\n for (let i = 0; i < float32Data.length; i++) {\n const clipped = Math.max(-32768, Math.min(32767, float32Data[i]!));\n outputData[i] = Math.round(clipped);\n }\n\n return new AudioFrame(outputData, frame.sampleRate, frame.channels, frame.samplesPerChannel);\n }\n\n private async playTask({\n playHandle,\n sound,\n volume,\n loop,\n signal,\n }: {\n playHandle: PlayHandle;\n sound: AudioSourceType;\n volume: number;\n loop: boolean;\n signal: AbortSignal;\n }): Promise {\n if (isBuiltinAudioClip(sound)) {\n sound = getBuiltinAudioPath(sound);\n }\n\n let audioStream: AsyncIterable;\n if (typeof sound === 'string') {\n audioStream = loop\n ? loopAudioFramesFromFile(sound, { abortSignal: signal })\n : audioFramesFromFile(sound, { abortSignal: signal });\n } else {\n audioStream = sound;\n }\n\n const applyVolume = this.applyVolumeToFrame.bind(this);\n async function* genWrapper(): AsyncGenerator {\n for await (const frame of audioStream) {\n if (signal.aborted || playHandle.done()) break;\n yield volume !== 1.0 ? applyVolume(frame, volume) : frame;\n }\n playHandle._markPlayoutDone();\n }\n\n const gen = genWrapper();\n try {\n this.audioMixer.addStream(gen);\n await playHandle.waitForPlayout();\n } finally {\n this.audioMixer.removeStream(gen);\n playHandle._markPlayoutDone();\n\n if (playHandle.done()) {\n await gen.return(undefined);\n }\n }\n }\n}\n","// Shim globals in cjs bundle\n// There's a weird bug that esbuild will always inject importMetaUrl\n// if we export it as `const importMetaUrl = ... __filename ...`\n// But using a function will not cause this issue\n\nconst getImportMetaUrl = () =>\n typeof document === 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