Good enough 5 me.
This commit is contained in:
parent
9e29d552a0
commit
948d2ea1f1
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@ -1,28 +1,23 @@
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import * as Message from "../message";
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import * as MP4 from "../../mp4"
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import * as Stream from "../../stream"
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import * as Util from "../../util"
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import { Ring, RingState } from "../ring"
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import * as Message from "./message";
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import * as MP4 from "../mp4"
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import * as Stream from "../stream"
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import * as Util from "../util"
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// Ignore the timestamp output by WebCodecs since it's in microseconds
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// We will manually set the timestamp based on the sample rate.
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let frameCount = 0
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import Renderer from "./renderer"
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export default class Decoder {
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// Store the init message for each track
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tracks: Map<string, Util.Deferred<Message.Init>>;
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sampleRate: number;
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channels: Ring[];
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sync?: number; // the first timestamp
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decoder: AudioDecoder; // TODO one per track
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sync: Message.Sync;
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constructor(config: Message.Config) {
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constructor(config: Message.Config, renderer: Renderer) {
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this.tracks = new Map();
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this.sampleRate = config.sampleRate
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this.channels = []
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for (let state of config.channels) {
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this.channels.push(new Ring(state))
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}
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this.decoder = new AudioDecoder({
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output: renderer.emit.bind(renderer),
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error: console.warn,
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});
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}
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init(msg: Message.Init) {
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@ -39,14 +34,6 @@ export default class Decoder {
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const track = msg.info.audioTracks[0]
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const audio = track.audio
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if (audio.sample_rate != this.sampleRate) {
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throw new Error("sample rate not supported")
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}
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if (audio.channel_count > this.channels.length) {
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throw new Error("channel count not supported")
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}
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defer.resolve(msg)
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}
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@ -61,40 +48,24 @@ export default class Decoder {
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const init = await track.promise;
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const audio = init.info.audioTracks[0]
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const decoder = new AudioDecoder({
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output: (frame: AudioData) => {
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for (let i = 0; i < frame.numberOfChannels; i += 1) {
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this.channels[i].emit(frameCount, frame, i)
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}
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frameCount += frame.numberOfFrames;
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},
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error: (err: Error) => {
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console.warn(err)
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}
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});
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decoder.configure({
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codec: audio.codec,
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numberOfChannels: audio.audio.channel_count,
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sampleRate: audio.audio.sample_rate,
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// optimizeForLatency: true
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})
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if (this.decoder.state == "unconfigured") {
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this.decoder.configure({
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codec: audio.codec,
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numberOfChannels: audio.audio.channel_count,
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sampleRate: audio.audio.sample_rate,
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})
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}
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const input = MP4.New();
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input.onSamples = (id: number, user: any, samples: MP4.Sample[]) => {
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for (let sample of samples) {
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if (!this.sync) {
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this.sync = sample.dts;
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}
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// Convert to milliseconds
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const timestamp = 1000 * (sample.dts - this.sync) / sample.timescale
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const duration = 1000 * sample.duration / sample.timescale
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// Convert to microseconds
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const timestamp = 1000 * 1000 * sample.dts / sample.timescale
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const duration = 1000 * 1000 * sample.duration / sample.timescale
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// This assumes that timescale == sample rate
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decoder.decode(new EncodedAudioChunk({
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this.decoder.decode(new EncodedAudioChunk({
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type: sample.is_sync ? "key" : "delta",
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data: sample.data,
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duration: duration,
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@ -1,29 +0,0 @@
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import * as Message from "../message"
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// Wrapper to run the decoder in a Worker
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export default class Decoder {
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worker: Worker;
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constructor(config: Message.Config) {
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const url = new URL('worker.ts', import.meta.url)
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this.worker = new Worker(url, {
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name: "audio",
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type: "module",
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})
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this.worker.onmessage = this.onMessage.bind(this)
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this.worker.postMessage({ config })
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}
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init(init: Message.Init) {
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this.worker.postMessage({ init })
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}
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segment(segment: Message.Segment) {
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this.worker.postMessage({ segment }, [ segment.buffer.buffer, segment.reader ])
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}
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private onMessage(e: MessageEvent) {
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// TODO
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}
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}
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@ -1,35 +1,77 @@
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import * as Message from "./message"
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import Renderer from "./renderer"
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import Decoder from "./decoder"
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import { RingState } from "./ring"
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import { RingInit } from "./ring"
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// Abstracts the Worker and Worklet into a simpler API
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// This class must be created on the main thread due to AudioContext.
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export default class Audio {
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decoder: Decoder; // WebWorker
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renderer: Renderer; // AudioWorklet
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context: AudioContext;
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worker: Worker;
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worklet: Promise<AudioWorkletNode>;
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constructor() {
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// Assume 44.1kHz and two audio channels
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const config = {
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sampleRate: 44100,
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channels: [ new RingState(44100), new RingState(44100) ],
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ring: new RingInit(2, 4410), // 100ms at 44.1khz
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}
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// Start loading the worker script
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this.decoder = new Decoder(config)
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this.renderer = new Renderer(config)
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this.context = new AudioContext({
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latencyHint: "interactive",
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sampleRate: config.sampleRate,
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})
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this.worker = this.setupWorker(config)
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this.worklet = this.setupWorklet(config)
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}
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private setupWorker(config: Message.Config): Worker {
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const url = new URL('worker.ts', import.meta.url)
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const worker = new Worker(url, {
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name: "audio",
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type: "module",
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})
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worker.postMessage({ config })
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return worker
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}
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private async setupWorklet(config: Message.Config): Promise<AudioWorkletNode> {
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// Load the worklet source code.
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const url = new URL('worklet.ts', import.meta.url)
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await this.context.audioWorklet.addModule(url)
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const volume = this.context.createGain()
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volume.gain.value = 2.0;
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// Create a worklet
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const worklet = new AudioWorkletNode(this.context, 'renderer');
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worklet.onprocessorerror = (e: Event) => {
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console.error("Audio worklet error:", e)
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};
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worklet.port.postMessage({ config })
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// Connect the worklet to the volume node and then to the speakers
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worklet.connect(volume)
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volume.connect(this.context.destination)
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return worklet
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}
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init(init: Message.Init) {
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this.decoder.init(init)
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this.worker.postMessage({ init })
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}
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segment(segment: Message.Segment) {
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this.decoder.segment(segment)
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this.worker.postMessage({ segment }, [ segment.buffer.buffer, segment.reader ])
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}
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play() {
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this.renderer.play()
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play(play: Message.Play) {
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this.context.resume()
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//this.worker.postMessage({ play })
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}
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}
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@ -1,9 +1,9 @@
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import * as MP4 from "../mp4"
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import { RingState } from "./ring"
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import { RingInit } from "./ring"
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export interface Config {
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sampleRate: number;
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channels: RingState[];
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ring: RingInit;
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}
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export interface Init {
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track: string;
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buffer: Uint8Array; // unread buffered data
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reader: ReadableStream; // unread unbuffered data
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}
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// Audio tells video when the given timestamp should be rendered.
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export interface Sync {
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origin: number;
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clock: DOMHighResTimeStamp;
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timestamp: number;
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}
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export interface Play {
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timestamp?: number;
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}
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@ -0,0 +1,85 @@
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import * as Message from "./message"
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import { Ring } from "./ring"
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export default class Renderer {
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ring: Ring;
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queue: Array<AudioData>;
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sync?: DOMHighResTimeStamp
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running: number;
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constructor(config: Message.Config) {
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this.ring = new Ring(config.ring)
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this.queue = [];
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this.running = 0
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}
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emit(frame: AudioData) {
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if (!this.sync) {
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// Save the frame as the sync point
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this.sync = 1000 * performance.now() - frame.timestamp
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}
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// Insert the frame into the queue sorted by timestamp.
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if (this.queue.length > 0 && this.queue[this.queue.length-1].timestamp <= frame.timestamp) {
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// Fast path because we normally append to the end.
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this.queue.push(frame)
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} else {
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// Do a full binary search
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let low = 0
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let high = this.queue.length;
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while (low < high) {
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var mid = (low + high) >>> 1;
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if (this.queue[mid].timestamp < frame.timestamp) low = mid + 1;
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else high = mid;
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}
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this.queue.splice(low, 0, frame)
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}
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if (!this.running) {
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// Wait for the next animation frame
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this.running = self.requestAnimationFrame(this.render.bind(this))
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}
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}
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render() {
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// Determine the target timestamp.
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const target = 1000 * performance.now() - this.sync!
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// Check if we should skip some frames
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while (this.queue.length) {
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const next = this.queue[0]
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if (next.timestamp >= target) {
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break
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}
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console.warn("dropping audio")
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this.queue.shift()
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next.close()
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}
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// Push as many as we can to the ring buffer.
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while (this.queue.length) {
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let frame = this.queue[0]
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let ok = this.ring.write(frame)
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if (!ok) {
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break
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}
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frame.close()
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this.queue.shift()
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}
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if (this.queue.length) {
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this.running = self.requestAnimationFrame(this.render.bind(this))
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} else {
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this.running = 0
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}
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}
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play(play: Message.Play) {
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this.ring.reset()
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}
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}
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import * as Message from "../message"
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export default class Renderer {
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context: AudioContext;
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worklet: Promise<AudioWorkletNode>;
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constructor(config: Message.Config) {
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this.context = new AudioContext({
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latencyHint: "interactive",
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sampleRate: config.sampleRate,
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})
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this.worklet = this.setup(config)
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}
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private async setup(config: Message.Config): Promise<AudioWorkletNode> {
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// Load the worklet source code.
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const url = new URL('worklet.ts', import.meta.url)
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await this.context.audioWorklet.addModule(url)
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const volume = this.context.createGain()
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volume.gain.value = 2.0;
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// Create a worklet
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const worklet = new AudioWorkletNode(this.context, 'renderer');
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worklet.onprocessorerror = (e: Event) => {
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console.error("Audio worklet error:", e)
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};
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worklet.port.onmessage = this.onMessage.bind(this)
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worklet.port.postMessage({ config })
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// Connect the worklet to the volume node and then to the speakers
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worklet.connect(volume)
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volume.connect(this.context.destination)
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return worklet
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}
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private onMessage(e: MessageEvent) {
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// TODO
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}
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play() {
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this.context.resume()
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}
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}
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@ -1,142 +1,143 @@
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// Ring buffer with audio samples.
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enum STATE {
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START = 0, // First timestamp in the ring buffer.
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END, // Last timestamp in the ring buffer.
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LENGTH // Clever way of saving the total number of enums values.
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READ_INDEX = 0, // Index of the current read position (mod capacity)
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WRITE_INDEX, // Index of the current write position (mod capacity)
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LENGTH // Clever way of saving the total number of enums values.
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}
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export class Ring {
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state: RingState;
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state: Int32Array;
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channels: Float32Array[];
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capacity: number;
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constructor(state: RingState) {
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this.state = state
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}
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constructor(init: RingInit) {
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this.state = new Int32Array(init.state)
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// Add the samples for single audio frame with the given channel
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emit(timestamp: number, frame: AudioData, channel: number) {
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let start = timestamp;
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// The number of samples to skip at the start.
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let offset = this.start - timestamp;
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if (offset > 0) {
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console.warn("dropping old samples", offset)
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start += offset;
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} else {
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offset = 0
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this.channels = []
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for (let channel of init.channels) {
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this.channels.push(new Float32Array(channel))
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}
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let count = frame.numberOfFrames - offset;
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if (count <= 0) {
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frame.close()
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this.capacity = init.capacity
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}
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// Skip the entire frame
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// Add the samples for single audio frame
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write(frame: AudioData): boolean {
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let count = frame.numberOfFrames;
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let readIndex = Atomics.load(this.state, STATE.READ_INDEX)
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let writeIndex = Atomics.load(this.state, STATE.WRITE_INDEX)
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let writeIndexNew = writeIndex + count;
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// There's not enough space in the ring buffer
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if (writeIndexNew - readIndex > this.capacity) {
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return false
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}
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let startIndex = writeIndex % this.capacity;
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let endIndex = writeIndexNew % this.capacity;
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// Loop over each channel
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for (let i = 0; i < this.channels.length; i += 1) {
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const channel = this.channels[i]
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if (startIndex < endIndex) {
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// One continuous range to copy.
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const full = channel.subarray(startIndex, endIndex)
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frame.copyTo(full, {
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planeIndex: i,
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frameCount: count,
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})
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} else {
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const first = channel.subarray(startIndex)
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const second = channel.subarray(0, endIndex)
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frame.copyTo(first, {
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planeIndex: i,
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frameCount: first.length,
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})
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frame.copyTo(second, {
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planeIndex: i,
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frameOffset: first.length,
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frameCount: second.length,
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})
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}
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}
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Atomics.store(this.state, STATE.WRITE_INDEX, writeIndexNew)
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return true
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}
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read(dst: Float32Array[]) {
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let readIndex = Atomics.load(this.state, STATE.READ_INDEX)
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let writeIndex = Atomics.load(this.state, STATE.WRITE_INDEX)
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if (readIndex >= writeIndex) {
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// nothing to read
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return
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}
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let end = timestamp + count;
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if (end >= start + this.state.capacity) {
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// The renderer has to buffer frames; we have a fixed capacity.
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// TODO maybe it's better to buffer here instead.
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throw new Error("exceeded capacity")
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let readIndexNew = readIndex + dst[0].length
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if (readIndexNew > writeIndex) {
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// Partial read
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readIndexNew = writeIndex
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}
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const startIndex = start % this.state.capacity;
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const endIndex = end % this.state.capacity;
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let startIndex = readIndex % this.capacity;
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let endIndex = readIndexNew % this.capacity;
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if (startIndex < endIndex) {
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// One continuous range to copy.
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const full = new Float32Array(this.state.buffer, 4*startIndex, endIndex-startIndex)
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// Loop over each channel
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for (let i = 0; i < dst.length; i += 1) {
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if (i >= this.channels.length) {
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// ignore excess channels
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}
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frame.copyTo(full, {
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planeIndex: channel,
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frameOffset: offset,
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frameCount: count,
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})
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} else {
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// Wrapped around the ring buffer, so we have to copy twice.
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const wrap = this.state.capacity - startIndex;
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const input = this.channels[i]
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const output = dst[i]
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const first = new Float32Array(this.state.buffer, 4*startIndex, this.state.capacity - startIndex)
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const second = new Float32Array(this.state.buffer, 0, endIndex)
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||||
if (startIndex < endIndex) {
|
||||
const full = input.subarray(startIndex, endIndex)
|
||||
output.set(full)
|
||||
} else {
|
||||
const first = input.subarray(startIndex)
|
||||
const second = input.subarray(0, endIndex)
|
||||
|
||||
frame.copyTo(first, {
|
||||
planeIndex: channel,
|
||||
frameOffset: offset,
|
||||
frameCount: wrap,
|
||||
})
|
||||
|
||||
frame.copyTo(second, {
|
||||
planeIndex: channel,
|
||||
frameOffset: offset + wrap,
|
||||
frameCount: endIndex,
|
||||
})
|
||||
output.set(first)
|
||||
output.set(second, first.length)
|
||||
}
|
||||
}
|
||||
|
||||
if (this.end < end) {
|
||||
this.end = end
|
||||
}
|
||||
Atomics.store(this.state, STATE.READ_INDEX, readIndexNew)
|
||||
}
|
||||
|
||||
peek(count: number): Float32Array[] {
|
||||
const start = this.start
|
||||
|
||||
let end = this.end
|
||||
if (end > start + count) {
|
||||
end = start + count
|
||||
}
|
||||
|
||||
const startIndex = start % this.state.capacity;
|
||||
const endIndex = end % this.state.capacity;
|
||||
|
||||
if (startIndex < endIndex) {
|
||||
const full = new Float32Array(this.state.buffer, 4*startIndex, endIndex - startIndex)
|
||||
return [ full ]
|
||||
} else {
|
||||
const first = new Float32Array(this.state.buffer, 4*startIndex, this.state.capacity - startIndex)
|
||||
const second = new Float32Array(this.state.buffer, 0, endIndex)
|
||||
return [ first, second ]
|
||||
}
|
||||
}
|
||||
|
||||
advance(count: number) {
|
||||
this.start += count
|
||||
}
|
||||
|
||||
set start(start: number) {
|
||||
Atomics.store(this.state.stateView, STATE.START, start);
|
||||
}
|
||||
|
||||
get start(): number {
|
||||
return Atomics.load(this.state.stateView, STATE.START);
|
||||
}
|
||||
|
||||
set end(end: number) {
|
||||
Atomics.store(this.state.stateView, STATE.END, end);
|
||||
}
|
||||
|
||||
get end(): number {
|
||||
return Atomics.load(this.state.stateView, STATE.END);
|
||||
// TODO not thread safe
|
||||
clear() {
|
||||
const writeIndex = Atomics.load(this.state, STATE.WRITE_INDEX)
|
||||
Atomics.store(this.state, STATE.READ_INDEX, writeIndex)
|
||||
}
|
||||
}
|
||||
|
||||
// No prototype to make this easier to send via postMessage
|
||||
export class RingState {
|
||||
export class RingInit {
|
||||
state: SharedArrayBuffer;
|
||||
stateView: Int32Array;
|
||||
|
||||
buffer: SharedArrayBuffer;
|
||||
|
||||
channels: SharedArrayBuffer[];
|
||||
capacity: number;
|
||||
|
||||
constructor(capacity: number) {
|
||||
// Store this many samples in a ring buffer.
|
||||
this.buffer = new SharedArrayBuffer(capacity * Float32Array.BYTES_PER_ELEMENT)
|
||||
this.capacity = capacity
|
||||
|
||||
constructor(channels: number, capacity: number) {
|
||||
// Store the current state in a separate ring buffer.
|
||||
this.state = new SharedArrayBuffer(STATE.LENGTH * Int32Array.BYTES_PER_ELEMENT)
|
||||
this.stateView = new Int32Array(this.state)
|
||||
|
||||
// Create a buffer for each audio channel
|
||||
this.channels = []
|
||||
for (let i = 0; i < channels; i += 1) {
|
||||
const buffer = new SharedArrayBuffer(capacity * Float32Array.BYTES_PER_ELEMENT)
|
||||
this.channels.push(buffer)
|
||||
}
|
||||
|
||||
this.capacity = capacity
|
||||
}
|
||||
}
|
|
@ -1,10 +1,15 @@
|
|||
import Decoder from "./decoder"
|
||||
import Renderer from "./renderer"
|
||||
|
||||
import * as Message from "./message"
|
||||
|
||||
let decoder: Decoder
|
||||
let renderer: Renderer;
|
||||
|
||||
self.addEventListener('message', (e: MessageEvent) => {
|
||||
if (e.data.config) {
|
||||
decoder = new Decoder(e.data.config)
|
||||
renderer = new Renderer(e.data.config)
|
||||
decoder = new Decoder(e.data.config, renderer)
|
||||
}
|
||||
|
||||
if (e.data.init) {
|
||||
|
@ -14,4 +19,8 @@ self.addEventListener('message', (e: MessageEvent) => {
|
|||
if (e.data.segment) {
|
||||
decoder.decode(e.data.segment)
|
||||
}
|
||||
|
||||
if (e.data.play) {
|
||||
renderer.play(e.data.play)
|
||||
}
|
||||
})
|
|
@ -2,17 +2,19 @@
|
|||
// The renderer copies audio samples to a ring buffer read by this worklet.
|
||||
// The worklet then outputs those samples to emit audio.
|
||||
|
||||
import * as Message from "../message"
|
||||
import * as Message from "./message"
|
||||
|
||||
import { Ring, RingState } from "../ring"
|
||||
import { Ring } from "./ring"
|
||||
|
||||
class Renderer extends AudioWorkletProcessor {
|
||||
channels?: Ring[];
|
||||
ring?: Ring;
|
||||
base: number;
|
||||
|
||||
constructor(params: AudioWorkletNodeOptions) {
|
||||
// The super constructor call is required.
|
||||
super();
|
||||
|
||||
this.base = 0
|
||||
this.port.onmessage = this.onMessage.bind(this)
|
||||
}
|
||||
|
||||
|
@ -23,15 +25,12 @@ class Renderer extends AudioWorkletProcessor {
|
|||
}
|
||||
|
||||
config(config: Message.Config) {
|
||||
this.channels = []
|
||||
for (let state of config.channels) {
|
||||
this.channels.push(new Ring(state))
|
||||
}
|
||||
this.ring = new Ring(config.ring)
|
||||
}
|
||||
|
||||
// Inputs and outputs in groups of 128 samples.
|
||||
process(inputs: Float32Array[][], outputs: Float32Array[][], parameters: Record<string, Float32Array>): boolean {
|
||||
if (!this.channels) {
|
||||
if (!this.ring) {
|
||||
// Not initialized yet
|
||||
return true
|
||||
}
|
||||
|
@ -41,26 +40,7 @@ class Renderer extends AudioWorkletProcessor {
|
|||
}
|
||||
|
||||
const output = outputs[0]
|
||||
|
||||
for (let i = 0; i < output.length; i += 1) {
|
||||
const source = this.channels[i]
|
||||
const channel = output[i];
|
||||
|
||||
const parts = source.peek(channel.length)
|
||||
|
||||
let offset = 0
|
||||
for (let i = 0; i < parts.length; i += 1) {
|
||||
channel.set(parts[i], offset)
|
||||
offset += parts[i].length
|
||||
}
|
||||
|
||||
if (offset < channel.length) {
|
||||
// TODO render silence
|
||||
}
|
||||
|
||||
// Always advance the full amount.
|
||||
source.advance(channel.length)
|
||||
}
|
||||
this.ring.read(output)
|
||||
|
||||
return true;
|
||||
}
|
|
@ -34,7 +34,13 @@ export default class Player {
|
|||
}
|
||||
|
||||
play() {
|
||||
this.audio.play()
|
||||
this.video.play()
|
||||
this.audio.play({})
|
||||
//this.video.play()
|
||||
}
|
||||
|
||||
onMessage(msg: any) {
|
||||
if (msg.sync) {
|
||||
msg.sync
|
||||
}
|
||||
}
|
||||
}
|
|
@ -4,17 +4,13 @@ export default class Renderer {
|
|||
canvas: OffscreenCanvas;
|
||||
queue: Array<VideoFrame>;
|
||||
render: number; // non-zero if requestAnimationFrame has been called
|
||||
sync: DOMHighResTimeStamp; // the wall clock value for timestamp 0
|
||||
sync?: DOMHighResTimeStamp; // the wall clock value for timestamp 0
|
||||
last?: number; // the timestamp of the last rendered frame
|
||||
|
||||
maxDuration: number; // the maximum duration allowed in the buffer
|
||||
|
||||
constructor(config: Message.Config) {
|
||||
this.canvas = config.canvas;
|
||||
this.queue = [];
|
||||
this.render = 0;
|
||||
this.sync = 0;
|
||||
this.maxDuration = 10 * 1000
|
||||
}
|
||||
|
||||
emit(frame: VideoFrame) {
|
||||
|
@ -30,14 +26,14 @@ export default class Renderer {
|
|||
}
|
||||
|
||||
// Insert the frame into the queue sorted by timestamp.
|
||||
let low = 0
|
||||
let high = this.queue.length;
|
||||
|
||||
// Fast path because we normally append to the end.
|
||||
if (this.queue.length > 0 && this.queue[this.queue.length-1].timestamp <= frame.timestamp) {
|
||||
// Fast path because we normally append to the end.
|
||||
this.queue.push(frame)
|
||||
} else {
|
||||
// Do a full binary search
|
||||
let low = 0
|
||||
let high = this.queue.length;
|
||||
|
||||
while (low < high) {
|
||||
var mid = (low + high) >>> 1;
|
||||
if (this.queue[mid].timestamp < frame.timestamp) low = mid + 1;
|
||||
|
@ -47,18 +43,6 @@ export default class Renderer {
|
|||
this.queue.splice(low, 0, frame)
|
||||
}
|
||||
|
||||
// Trim the max size of the buffer
|
||||
const last = this.queue[this.queue.length-1].timestamp
|
||||
while (1) {
|
||||
const first = this.queue[0]
|
||||
if (first.timestamp + this.maxDuration >= last) {
|
||||
break
|
||||
}
|
||||
|
||||
first.close()
|
||||
this.queue.shift()
|
||||
}
|
||||
|
||||
// Queue up to render the next frame.
|
||||
if (!this.render) {
|
||||
this.render = self.requestAnimationFrame(this.draw.bind(this))
|
||||
|
@ -67,10 +51,10 @@ export default class Renderer {
|
|||
|
||||
draw(now: DOMHighResTimeStamp) {
|
||||
// Determine the target timestamp.
|
||||
const target = now - this.sync
|
||||
const target = now - this.sync!
|
||||
|
||||
let frame = this.queue[0]
|
||||
if (frame.timestamp > target) {
|
||||
if (frame.timestamp >= target) {
|
||||
// nothing to render yet, wait for the next animation frame
|
||||
this.render = self.requestAnimationFrame(this.draw.bind(this))
|
||||
return
|
||||
|
@ -92,7 +76,7 @@ export default class Renderer {
|
|||
}
|
||||
|
||||
const ctx = this.canvas.getContext("2d");
|
||||
ctx?.drawImage(frame, 0, 0, this.canvas.width, this.canvas.height) // TODO aspect ratio
|
||||
ctx!.drawImage(frame, 0, 0, this.canvas.width, this.canvas.height) // TODO aspect ratio
|
||||
|
||||
this.last = frame.timestamp;
|
||||
frame.close()
|
||||
|
|
Loading…
Reference in New Issue