222 lines
No EOL
6.3 KiB
JavaScript
222 lines
No EOL
6.3 KiB
JavaScript
const EventEmitter = require('events');
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const { sleep } = require('../libs/util.js');
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const { spawn } = require('child_process');
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const createWriteStream = require('fs').createWriteStream;
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const unlink = require('fs/promises').unlink;
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const resolve = require('path').resolve;
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const STATE_SPAWNED = 'spawned';
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const STATE_READY = 'ready';
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const STATE_PLAYING = 'playing';
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const STATE_PAUSED = 'paused';
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const STATE_STOPPED = 'stopped';
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const STATE_ERROR = 'error';
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class Player extends EventEmitter {
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constructor() {
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super();
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this.position = 0;
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this.events = [];
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this.buffer = [];
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this.tmp = {
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file: resolve('/tmp/kannon.tmp')
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}
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this.buffersize = 0;
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}
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async prepare(size, threshold) {
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logger.debug('preparing audio player...');
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this.size = size;
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this.threshold = threshold;
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this.tmp.stream = createWriteStream(this.tmp.file);
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this.#reset();
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this.#spawnProcess();
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}
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feed(buffer) {
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this.buffer.push(buffer);
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this.buffersize += buffer.length;
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if (this.isSpawned() && this.buffersize >= this.threshold) {
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this.#setState(STATE_READY);
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}
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}
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async play() {
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if (this.isPlaying()) {
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this.stop();
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}
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await this.#spawnProcess();
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this.process.stderr.on('data', (data) => {
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this.#setState(STATE_PLAYING);
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data = data.toString();
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const position = data.toString().trim().split(' ')[0];
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if (position.length === 0 || isNaN(position)) {
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return;
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}
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this.position = position;
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});
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this.process.stdin.on('error', (error) => {
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this.#setState(STATE_ERROR, error);
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});
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if (this.process.spawnargs[this.process.spawnargs.length] === this.tmp.file) {
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return;
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}
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if (this.buffer === undefined || this.buffer.length === 0) {
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logger.warn('aborting playback of an empty buffer...');
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return;
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}
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const timestamp = Date.now();
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while (true) {
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if (this.buffer.length === 0 && this.buffersize !== this.size) {
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await sleep(1);
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continue;
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}
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const tmp = this.buffer[0];
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this.buffer.shift();
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if (this.buffer.length === 0 && this.buffersize === this.size) {
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logger.warn('BUFFER EMPTIED AFTER ' + ( Date.now() - timestamp) + 'ms')
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this.process.stdin.end(tmp);
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this.tmp.stream.end(tmp);
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break;
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}
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this.tmp.stream.write(tmp);
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this.process.stdin.write(tmp);
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}
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}
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async pause() {
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this.#setState(STATE_PAUSED);
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this.#reset();
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this.#spawnProcess();
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}
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async stop() {
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this.#setState(STATE_STOPPED);
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this.#reset();
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}
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isSpawned() {
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return this.state === STATE_SPAWNED;
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}
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isReady() {
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return this.state === STATE_READY;
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}
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isPlaying() {
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return this.state === STATE_PLAYING;
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}
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isPaused() {
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return this.state === STATE_PAUSED;
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}
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isFinished() {
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return this.state === STATE_STOPPED;
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}
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hasError() {
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return this.state === STATE_ERROR;
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}
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async #spawnProcess() {
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if (this.process !== undefined) {
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return;
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}
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return new Promise((resolve, reject) => {
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const args = [
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'-vn',
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'-nodisp'
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];
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if (this.isPaused()) {
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args.unshift('-ss', this.position);
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args.push(this.tmp.file);
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} else {
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args.push('-');
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}
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this.process = spawn("ffplay", args);
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this.process.on('error', (error) => {
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this.#reset();
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// TODO: try/catch error
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reject('error spawning process \'ffplay\': ' + error);
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});
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this.process.on('exit', (code, signal) => {
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let msg = 'process \'ffplay\' exited with';
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if (code !== undefined) {
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msg += ' code \'' + code + '\'';
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} else {
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msg += ' signal \'' + signal + '\'';
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}
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logger.debug(msg);
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this.#closeStdIO();
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});
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this.process.on('close', (code, signal) => {
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let msg = 'process \'ffplay\' closed with';
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if (code !== undefined) {
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msg += ' code \'' + code + '\'';
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} else {
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msg += ' signal \'' + signal + '\'';
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}
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logger.debug(msg);
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this.process = undefined;
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});
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this.process.on('spawn', () => {
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logger.info('spawned process \'ffplay\' (pid: ' + this.process.pid + ')...');
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this.#setState(STATE_SPAWNED);
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resolve();
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});
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});
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}
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#setState(state, data) {
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if (this.state === state) {
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return;
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}
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this.state = state;
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logger.debug('setting state of audio player to \'' + state + '\'...');
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if (this.events.includes(state)) {
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return;
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}
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logger.debug('emitting state \'' + state + '\' of audio player...');
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this.emit(state, data);
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this.events.push(state);
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}
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#killProcess() {
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this.#closeStdIO();
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if (this.process?.killed === false) {
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this.process.kill('SIGTERM');
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}
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}
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#closeStdIO() {
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if (this.process?.stdio === undefined) {
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return;
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}
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logger.debug('closing all stdio streams of process \'ffplay\' (pid: ' + this.process.pid + ')...');
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for (let index = 0; index < this.process.stdio.length; index++) {
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this.process.stdio[index].destroy();
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}
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}
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async #reset() {
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this.#killProcess();
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this.events = [];
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this.buffer = [];
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if (!this.isPaused()) {
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this.position = 0;
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this.backupbuffer = [];
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this.buffersize = 0;
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try {
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await unlink(this.tmp.file);
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} catch (error) {
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logger.error('no file to unlink ' + this.tmp.file);
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}
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}
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}
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}
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module.exports = Player; |