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Initial commit of WebOS receiver
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118 changed files with 18279 additions and 1746 deletions
208
receivers/common/web/FCastSession.ts
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208
receivers/common/web/FCastSession.ts
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import * as net from 'net';
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import * as log4js from "modules/log4js";
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import { EventEmitter } from 'node:events';
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import { PlaybackErrorMessage, PlaybackUpdateMessage, PlayMessage, SeekMessage, SetSpeedMessage, SetVolumeMessage, VersionMessage, VolumeUpdateMessage } from 'common/Packets';
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import { WebSocket } from 'modules/ws';
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const logger = log4js.getLogger();
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enum SessionState {
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Idle = 0,
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WaitingForLength,
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WaitingForData,
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Disconnected,
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};
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export enum Opcode {
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None = 0,
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Play = 1,
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Pause = 2,
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Resume = 3,
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Stop = 4,
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Seek = 5,
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PlaybackUpdate = 6,
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VolumeUpdate = 7,
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SetVolume = 8,
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PlaybackError = 9,
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SetSpeed = 10,
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Version = 11,
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Ping = 12,
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Pong = 13
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};
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const LENGTH_BYTES = 4;
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const MAXIMUM_PACKET_LENGTH = 32000;
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export class FCastSession {
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buffer: Buffer = Buffer.alloc(MAXIMUM_PACKET_LENGTH);
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bytesRead = 0;
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packetLength = 0;
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socket: net.Socket | WebSocket;
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writer: (data: Buffer) => void;
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state: SessionState;
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emitter = new EventEmitter();
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constructor(socket: net.Socket | WebSocket, writer: (data: Buffer) => void) {
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this.socket = socket;
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this.writer = writer;
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this.state = SessionState.WaitingForLength;
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}
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send(opcode: number, message = null) {
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const json = message ? JSON.stringify(message) : null;
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logger.info(`send (opcode: ${opcode}, body: ${json})`);
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let data: Uint8Array;
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if (json) {
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const utf8Encode = new TextEncoder();
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data = utf8Encode.encode(json);
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} else {
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data = new Uint8Array(0);
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}
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const size = 1 + data.length;
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const header = Buffer.alloc(4 + 1);
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header.writeUint32LE(size, 0);
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header[4] = opcode;
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let packet: Buffer;
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if (data.length > 0) {
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packet = Buffer.concat([ header, data ]);
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} else {
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packet = header;
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}
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this.writer(packet);
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}
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close() {
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if (this.socket instanceof WebSocket) {
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this.socket.close();
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} else if (this.socket instanceof net.Socket) {
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this.socket.end();
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}
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}
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processBytes(receivedBytes: Buffer) {
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//TODO: Multithreading?
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if (receivedBytes.length == 0) {
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return;
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}
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logger.info(`${receivedBytes.length} bytes received`);
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switch (this.state) {
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case SessionState.WaitingForLength:
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this.handleLengthBytes(receivedBytes);
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break;
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case SessionState.WaitingForData:
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this.handlePacketBytes(receivedBytes);
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break;
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default:
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logger.info(`Data received is unhandled in current session state ${this.state}.`);
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break;
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}
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}
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private handleLengthBytes(receivedBytes: Buffer) {
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const bytesToRead = Math.min(LENGTH_BYTES, receivedBytes.length);
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const bytesRemaining = receivedBytes.length - bytesToRead;
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receivedBytes.copy(this.buffer, this.bytesRead, 0, bytesToRead);
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this.bytesRead += bytesToRead;
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logger.info(`handleLengthBytes: Read ${bytesToRead} bytes from packet`);
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if (this.bytesRead >= LENGTH_BYTES) {
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this.state = SessionState.WaitingForData;
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this.packetLength = this.buffer.readUInt32LE(0);
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this.bytesRead = 0;
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logger.info(`Packet length header received from: ${this.packetLength}`);
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if (this.packetLength > MAXIMUM_PACKET_LENGTH) {
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throw new Error(`Maximum packet length is 32kB: ${this.packetLength}`);
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}
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if (bytesRemaining > 0) {
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logger.info(`${bytesRemaining} remaining bytes pushed to handlePacketBytes`);
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this.handlePacketBytes(receivedBytes.slice(bytesToRead));
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}
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}
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}
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private handlePacketBytes(receivedBytes: Buffer) {
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const bytesToRead = Math.min(this.packetLength, receivedBytes.length);
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const bytesRemaining = receivedBytes.length - bytesToRead;
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receivedBytes.copy(this.buffer, this.bytesRead, 0, bytesToRead);
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this.bytesRead += bytesToRead;
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logger.info(`handlePacketBytes: Read ${bytesToRead} bytes from packet`);
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if (this.bytesRead >= this.packetLength) {
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logger.info(`Packet finished receiving from of ${this.packetLength} bytes.`);
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this.handleNextPacket();
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this.state = SessionState.WaitingForLength;
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this.packetLength = 0;
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this.bytesRead = 0;
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if (bytesRemaining > 0) {
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logger.info(`${bytesRemaining} remaining bytes pushed to handleLengthBytes`);
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this.handleLengthBytes(receivedBytes.slice(bytesToRead));
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}
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}
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}
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private handlePacket(opcode: number, body: string | undefined) {
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logger.info(`handlePacket (opcode: ${opcode}, body: ${body})`);
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try {
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switch (opcode) {
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case Opcode.Play:
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this.emitter.emit("play", JSON.parse(body) as PlayMessage);
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break;
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case Opcode.Pause:
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this.emitter.emit("pause");
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break;
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case Opcode.Resume:
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this.emitter.emit("resume");
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break;
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case Opcode.Stop:
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this.emitter.emit("stop");
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break;
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case Opcode.Seek:
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this.emitter.emit("seek", JSON.parse(body) as SeekMessage);
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break;
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case Opcode.SetVolume:
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this.emitter.emit("setvolume", JSON.parse(body) as SetVolumeMessage);
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break;
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case Opcode.SetSpeed:
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this.emitter.emit("setspeed", JSON.parse(body) as SetSpeedMessage);
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break;
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case Opcode.Ping:
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this.send(Opcode.Pong);
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break;
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}
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} catch (e) {
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logger.warn(`Error handling packet from.`, e);
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}
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}
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private handleNextPacket() {
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logger.info(`Processing packet of ${this.bytesRead} bytes from`);
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const opcode = this.buffer[0];
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const body = this.packetLength > 1 ? this.buffer.toString('utf8', 1, this.packetLength) : null;
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logger.info('body', body);
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this.handlePacket(opcode, body);
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}
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bindEvents(emitter: EventEmitter) {
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this.emitter.on("play", (body: PlayMessage) => { emitter.emit("play", body) });
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this.emitter.on("pause", () => { emitter.emit("pause") });
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this.emitter.on("resume", () => { emitter.emit("resume") });
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this.emitter.on("stop", () => { emitter.emit("stop") });
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this.emitter.on("seek", (body: SeekMessage) => { emitter.emit("seek", body) });
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this.emitter.on("setvolume", (body: SetVolumeMessage) => { emitter.emit("setvolume", body) });
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this.emitter.on("setspeed", (body: SetSpeedMessage) => { emitter.emit("setspeed", body) });
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}
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}
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