104 lines
2.3 KiB
TypeScript
104 lines
2.3 KiB
TypeScript
import * as MP4 from "../mp4"
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export class Encoder {
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container: MP4.ISOFile
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audio: AudioEncoder
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video: VideoEncoder
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constructor() {
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this.container = new MP4.ISOFile();
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this.audio = new AudioEncoder({
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output: this.onAudio.bind(this),
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error: console.warn,
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});
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this.video = new VideoEncoder({
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output: this.onVideo.bind(this),
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error: console.warn,
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});
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this.container.init();
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this.audio.configure({
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codec: "mp4a.40.2",
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numberOfChannels: 2,
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sampleRate: 44100,
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// TODO bitrate
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})
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this.video.configure({
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codec: "avc1.42002A", // TODO h.264 baseline
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avc: { format: "avc" }, // or annexb
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width: 1280,
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height: 720,
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// TODO bitrate
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// TODO bitrateMode
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// TODO framerate
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// TODO latencyMode
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})
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}
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onAudio(frame: EncodedAudioChunk, metadata: EncodedAudioChunkMetadata) {
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const config = metadata.decoderConfig!
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const track_id = 1;
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if (!this.container.getTrackById(track_id)) {
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this.container.addTrack({
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id: track_id,
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type: "mp4a", // TODO wrong
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timescale: 1000, // TODO verify
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channel_count: config.numberOfChannels,
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samplerate: config.sampleRate,
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description: config.description, // TODO verify
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// TODO description_boxes?: Box[];
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});
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}
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const buffer = new Uint8Array(frame.byteLength);
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frame.copyTo(buffer);
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// TODO cts?
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const sample = this.container.addSample(track_id, buffer, {
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is_sync: frame.type == "key",
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duration: frame.duration!,
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dts: frame.timestamp,
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});
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const _stream = this.container.createSingleSampleMoof(sample);
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}
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onVideo(frame: EncodedVideoChunk, metadata?: EncodedVideoChunkMetadata) {
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const config = metadata!.decoderConfig!
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const track_id = 2;
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if (!this.container.getTrackById(track_id)) {
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this.container.addTrack({
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id: 2,
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type: "avc1",
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width: config.codedWidth,
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height: config.codedHeight,
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timescale: 1000, // TODO verify
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description: config.description, // TODO verify
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// TODO description_boxes?: Box[];
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});
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}
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const buffer = new Uint8Array(frame.byteLength);
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frame.copyTo(buffer);
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// TODO cts?
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const sample = this.container.addSample(track_id, buffer, {
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is_sync: frame.type == "key",
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duration: frame.duration!,
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dts: frame.timestamp,
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});
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const _stream = this.container.createSingleSampleMoof(sample);
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}
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} |