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[web-wasm] Add minimal audio support
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76 changes: 76 additions & 0 deletions
76
ts/@live-compositor/web-wasm/src/mainContext/AudioMixer.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| import type { Api } from 'live-compositor'; | ||
| import { assert } from '../utils'; | ||
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| type AudioInput = { | ||
| source: MediaStreamAudioSourceNode; | ||
| gain: GainNode; | ||
| }; | ||
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| export class AudioMixer<OutputNode extends AudioNode = AudioNode> { | ||
| private ctx: AudioContext; | ||
| private inputs: Record<string, AudioInput> = {}; | ||
| protected outputNode: OutputNode; | ||
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| constructor(ctx: AudioContext, outputNode: OutputNode) { | ||
| this.ctx = ctx; | ||
| this.outputNode = outputNode; | ||
| } | ||
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| public addInput(inputId: string, track: MediaStreamTrack) { | ||
| const stream = new MediaStream(); | ||
| stream.addTrack(track); | ||
| const source = this.ctx.createMediaStreamSource(stream); | ||
| const gain = this.ctx.createGain(); | ||
| source.connect(gain); | ||
| gain.connect(this.outputNode ?? this.ctx.destination); | ||
| this.inputs[inputId] = { | ||
| source, | ||
| gain, | ||
| }; | ||
| } | ||
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| public removeInput(inputId: string) { | ||
| this.inputs[inputId]?.source.disconnect(); | ||
| this.inputs[inputId]?.gain.disconnect(); | ||
| delete this.inputs[inputId]; | ||
| } | ||
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| public update(inputConfig: Api.InputAudio[]) { | ||
| for (const [inputId, input] of Object.entries(this.inputs)) { | ||
| const config = inputConfig.find(input => input.input_id === inputId); | ||
| input.gain.gain.value = config?.volume || 0; | ||
| } | ||
| } | ||
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| public async close() { | ||
| await this.ctx.close(); | ||
| for (const inputId of Object.keys(this.inputs)) { | ||
| this.removeInput(inputId); | ||
| } | ||
| } | ||
| } | ||
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| export class MediaStreamAudioMixer extends AudioMixer<MediaStreamAudioDestinationNode> { | ||
| constructor() { | ||
| const ctx = new AudioContext(); | ||
| const outputNode = ctx.createMediaStreamDestination(); | ||
| const silence = ctx.createConstantSource(); | ||
| silence.offset.value = 0; | ||
| silence.connect(outputNode); | ||
| silence.start(); | ||
| super(ctx, outputNode); | ||
| } | ||
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| public outputMediaStreamTrack(): MediaStreamTrack { | ||
| const audioTrack = this.outputNode.stream.getAudioTracks()[0]; | ||
| assert(audioTrack); | ||
| return audioTrack; | ||
| } | ||
| } | ||
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| export class PlaybackAudioMixer extends AudioMixer<AudioDestinationNode> { | ||
| constructor() { | ||
| const ctx = new AudioContext(); | ||
| super(ctx, ctx.destination); | ||
| } | ||
| } |
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48 changes: 48 additions & 0 deletions
48
ts/@live-compositor/web-wasm/src/mainContext/input/stream.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| import type { Input, RegisterInputResult } from '../input'; | ||
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| export class StreamInput implements Input { | ||
| private mediaStream: MediaStream; | ||
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| constructor(mediaStream: MediaStream) { | ||
| this.mediaStream = mediaStream; | ||
| } | ||
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| public get audioTrack(): MediaStreamTrack | undefined { | ||
| return this.mediaStream.getAudioTracks()[0]; | ||
| } | ||
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| public async terminate(): Promise<void> { | ||
| this.mediaStream.getTracks().forEach(track => track.stop()); | ||
| } | ||
| } | ||
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| export async function handleRegisterStreamInput( | ||
| inputId: string, | ||
| stream: MediaStream | ||
| ): Promise<RegisterInputResult> { | ||
| const videoTrack = stream.getVideoTracks()[0]; | ||
| const transferable = []; | ||
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| // @ts-ignore | ||
| let videoTrackProcessor: MediaStreamTrackProcessor | undefined; | ||
| if (videoTrack) { | ||
| // @ts-ignore | ||
| videoTrackProcessor = new MediaStreamTrackProcessor({ track: videoTrack }); | ||
| transferable.push(videoTrackProcessor.readable); | ||
| } | ||
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| return { | ||
| input: new StreamInput(stream), | ||
| workerMessage: [ | ||
| { | ||
| type: 'registerInput', | ||
| inputId, | ||
| input: { | ||
| type: 'stream', | ||
| videoStream: videoTrackProcessor.readable, | ||
| }, | ||
| }, | ||
| transferable, | ||
| ], | ||
| }; | ||
| } |
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