1d33f3ed4e
When variant JS is loaded from featherChat (different origin), WASM imports need to resolve via the /audio/ Caddy path, not root /. All 4 variant files now use: (window.__WZP_BASE_URL || '') + '/wasm/...' Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
593 lines
19 KiB
JavaScript
593 lines
19 KiB
JavaScript
// WarzonePhone — WZP-WS-FEC client (Variant 5).
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// WebSocket transport, WZP wire protocol, WASM RaptorQ FEC.
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// Application-layer redundancy even over TCP.
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// Sends MediaPacket-formatted frames with FEC encoding.
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// Ready for direct relay WS support (no bridge translation needed).
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'use strict';
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// WASM module path (served from /wasm/ by the wzp-web bridge).
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const WZP_WS_FEC_WASM_PATH = (window.__WZP_BASE_URL || '') + '/wasm/wzp_wasm.js';
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// 12-byte MediaHeader size (matches wzp-proto MediaHeader::WIRE_SIZE).
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const WZP_WS_FEC_HEADER_SIZE = 12;
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// FEC wire header: block_id(1) + symbol_idx(1) + is_repair(1) = 3 bytes.
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const WZP_WS_FEC_FEC_HEADER_SIZE = 3;
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// FEC parameters.
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// A 960-sample Int16 PCM frame = 1920 bytes. We use symbol_size = 2048
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// (1920 payload + 2-byte length prefix + 126 bytes padding).
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const WZP_WS_FEC_BLOCK_SIZE = 5;
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const WZP_WS_FEC_SYMBOL_SIZE = 2048;
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// Length prefix size within each FEC symbol.
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const WZP_WS_FEC_LENGTH_PREFIX = 2;
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class WZPWsFecClient {
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/**
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* @param {Object} options
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* @param {string} options.wsUrl WebSocket URL (ws://host/ws/room)
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* @param {string} options.room Room name
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* @param {Function} options.onAudio callback(Int16Array) for playback
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* @param {Function} options.onStatus callback(string) for UI status
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* @param {Function} options.onStats callback(Object) for UI stats
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*/
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constructor(options) {
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this.wsUrl = options.wsUrl;
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this.room = options.room;
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this.authToken = options.authToken || null;
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this.onAudio = options.onAudio || null;
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this.onStatus = options.onStatus || null;
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this.onStats = options.onStats || null;
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this.ws = null;
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this.seq = 0;
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this.startTimestamp = 0;
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this.stats = { sent: 0, recv: 0, fecRecovered: 0 };
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this._startTime = 0;
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this._statsInterval = null;
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this._connected = false;
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this._authenticated = false;
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// WASM FEC instances (loaded in loadWasm() / connect()).
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this._wasmModule = null;
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this.fecEncoder = null;
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this.fecDecoder = null;
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this.wasmReady = false;
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// Current FEC block counter for outgoing packets.
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this._fecBlockId = 0;
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}
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/**
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* Load the WASM FEC module.
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* Called automatically by connect(), or can be called early.
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*/
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async loadWasm() {
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if (this.wasmReady) return;
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try {
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this._wasmModule = await import(WZP_WS_FEC_WASM_PATH);
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await this._wasmModule.default();
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this.fecEncoder = new this._wasmModule.WzpFecEncoder(
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WZP_WS_FEC_BLOCK_SIZE,
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WZP_WS_FEC_SYMBOL_SIZE
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);
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this.fecDecoder = new this._wasmModule.WzpFecDecoder(
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WZP_WS_FEC_BLOCK_SIZE,
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WZP_WS_FEC_SYMBOL_SIZE
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);
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this.wasmReady = true;
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console.log('[wzp-ws-fec] WASM FEC module loaded successfully');
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} catch (e) {
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console.error('[wzp-ws-fec] WASM FEC module failed to load:', e);
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this.wasmReady = false;
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throw e;
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}
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}
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/**
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* Build a 12-byte WZP MediaHeader.
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*
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* @param {number} seq Sequence number (u16)
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* @param {number} timestampMs Milliseconds since session start
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* @param {boolean} isRepair True if this is a FEC repair symbol
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* @param {number} codecId Codec ID (0=RawPcm16, 1=Opus16k, 2=Opus48k)
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* @param {number} fecBlock FEC block ID (u8)
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* @param {number} fecSymbol FEC symbol index (u8)
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* @param {number} fecRatio FEC ratio (0.0 to ~2.0)
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* @param {boolean} hasQuality Whether a quality report is attached
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* @returns {Uint8Array} 12-byte header
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*/
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_buildHeader(seq, timestampMs, isRepair = false, codecId = 0, fecBlock = 0, fecSymbol = 0, fecRatio = 0, hasQuality = false) {
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const buf = new ArrayBuffer(WZP_WS_FEC_HEADER_SIZE);
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const view = new DataView(buf);
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const fecRatioEncoded = Math.min(127, Math.round(fecRatio * 63.5));
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const byte0 = ((0 & 0x01) << 7) // version=0
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| ((isRepair ? 1 : 0) << 6) // T bit
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| ((codecId & 0x0F) << 2) // CodecID
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| ((hasQuality ? 1 : 0) << 1) // Q bit
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| ((fecRatioEncoded >> 6) & 0x01); // FecRatioHi
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view.setUint8(0, byte0);
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const byte1 = (fecRatioEncoded & 0x3F) << 2;
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view.setUint8(1, byte1);
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view.setUint16(2, seq & 0xFFFF); // big-endian (default for DataView)
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view.setUint32(4, timestampMs & 0xFFFFFFFF); // big-endian
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view.setUint8(8, fecBlock & 0xFF);
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view.setUint8(9, fecSymbol & 0xFF);
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view.setUint8(10, 0); // reserved
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view.setUint8(11, 0); // csrc_count
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return new Uint8Array(buf);
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}
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/**
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* Parse a 12-byte MediaHeader from received binary data.
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*
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* @param {Uint8Array} data At least 12 bytes
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* @returns {Object|null} Parsed header fields, or null if too short
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*/
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_parseHeader(data) {
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if (data.byteLength < WZP_WS_FEC_HEADER_SIZE) return null;
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const view = new DataView(data.buffer || data, data.byteOffset || 0, 12);
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const byte0 = view.getUint8(0);
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const byte1 = view.getUint8(1);
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const fecRatioEncoded = ((byte0 & 0x01) << 6) | ((byte1 >> 2) & 0x3F);
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return {
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version: (byte0 >> 7) & 1,
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isRepair: !!((byte0 >> 6) & 1),
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codecId: (byte0 >> 2) & 0x0F,
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hasQuality: !!((byte0 >> 1) & 1),
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fecRatio: fecRatioEncoded / 63.5,
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seq: view.getUint16(2),
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timestamp: view.getUint32(4),
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fecBlock: view.getUint8(8),
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fecSymbol: view.getUint8(9),
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reserved: view.getUint8(10),
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csrcCount: view.getUint8(11),
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};
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}
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/**
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* Pad a PCM frame into a FEC symbol with a 2-byte length prefix.
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* Symbol layout: [len_hi, len_lo, ...pcm_bytes..., ...zero_padding...]
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*
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* @param {Uint8Array} pcmBytes Raw PCM bytes
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* @returns {Uint8Array} Padded symbol of WZP_WS_FEC_SYMBOL_SIZE bytes
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*/
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_padToSymbol(pcmBytes) {
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const symbol = new Uint8Array(WZP_WS_FEC_SYMBOL_SIZE);
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const len = pcmBytes.length;
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symbol[0] = (len >> 8) & 0xFF;
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symbol[1] = len & 0xFF;
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symbol.set(pcmBytes, WZP_WS_FEC_LENGTH_PREFIX);
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return symbol;
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}
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/**
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* Extract the original PCM payload from a FEC symbol (strip prefix + padding).
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*
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* @param {Uint8Array} symbol Symbol data (WZP_WS_FEC_SYMBOL_SIZE bytes)
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* @returns {Uint8Array} Original PCM bytes
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*/
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_unpadSymbol(symbol) {
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const len = (symbol[0] << 8) | symbol[1];
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if (len > WZP_WS_FEC_SYMBOL_SIZE - WZP_WS_FEC_LENGTH_PREFIX) {
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// Sanity check: if length is bogus, return empty.
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return new Uint8Array(0);
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}
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return symbol.slice(WZP_WS_FEC_LENGTH_PREFIX, WZP_WS_FEC_LENGTH_PREFIX + len);
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}
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/**
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* Open WebSocket connection and load the WASM FEC module.
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* @returns {Promise<void>} resolves when connected
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*/
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async connect() {
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if (this._connected) return;
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// Load WASM module in parallel with WebSocket connect.
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const wasmPromise = this.loadWasm();
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const wsPromise = new Promise((resolve, reject) => {
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this._status('Connecting (WZP-WS-FEC) to room: ' + this.room + '...');
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this.ws = new WebSocket(this.wsUrl);
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this.ws.binaryType = 'arraybuffer';
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this.ws.onopen = () => {
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// Send auth if token provided.
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if (this.authToken) {
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this.ws.send(JSON.stringify({ type: 'auth', token: this.authToken }));
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}
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this._connected = true;
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this._authenticated = !this.authToken;
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this.seq = 0;
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this.startTimestamp = Date.now();
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this.stats = { sent: 0, recv: 0, fecRecovered: 0 };
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this._startTime = Date.now();
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this._fecBlockId = 0;
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this._startStatsTimer();
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resolve();
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};
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this.ws.onmessage = (event) => {
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// Handle text messages (auth responses).
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if (typeof event.data === 'string') {
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try {
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const msg = JSON.parse(event.data);
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if (msg.type === 'auth_ok') {
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this._authenticated = true;
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this._status('Authenticated (WZP-WS-FEC) to room: ' + this.room);
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}
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if (msg.type === 'auth_error') {
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this._status('Auth failed: ' + (msg.reason || 'unknown'));
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this.disconnect();
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}
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} catch(e) { /* ignore non-JSON text */ }
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return;
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}
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this._handleMessage(event);
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};
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this.ws.onclose = () => {
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const was = this._connected;
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this._cleanup();
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if (was) this._status('Disconnected');
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};
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this.ws.onerror = () => {
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if (!this._connected) {
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this._cleanup();
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reject(new Error('WebSocket connection failed'));
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} else {
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this._status('Connection error');
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}
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};
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});
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await Promise.all([wasmPromise, wsPromise]);
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const fecStatus = this.wasmReady ? 'FEC ready' : 'FEC unavailable';
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this._status('Connected (WZP-WS-FEC) to room: ' + this.room + ' (' + fecStatus + ')');
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}
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/**
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* Close WebSocket and clean up.
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*/
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disconnect() {
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this._connected = false;
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if (this.ws) {
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this.ws.close();
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this.ws = null;
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}
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this._stopStatsTimer();
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// Keep WASM module loaded (reusable), but reset encoder/decoder.
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if (this.fecEncoder) {
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try { this.fecEncoder.free(); } catch (_) { /* ignore */ }
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this.fecEncoder = null;
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}
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if (this.fecDecoder) {
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try { this.fecDecoder.free(); } catch (_) { /* ignore */ }
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this.fecDecoder = null;
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}
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}
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/**
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* Send a PCM audio frame with FEC encoding over the WebSocket.
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*
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* Each PCM frame is padded to a FEC symbol (2048 bytes with length prefix)
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* and fed to the FEC encoder. When a block of 5 symbols completes, the
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* encoder outputs source + repair symbols. Each is sent as an individual
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* WZP MediaPacket with the appropriate fecBlock, fecSymbol, and isRepair
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* fields in the 12-byte header.
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*
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* @param {ArrayBuffer} pcmBuffer 960-sample Int16 PCM (1920 bytes)
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*/
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async sendAudio(pcmBuffer) {
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if (!this._connected || !this.ws || this.ws.readyState !== WebSocket.OPEN) return;
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if (!this.wasmReady || !this.fecEncoder) return;
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const pcmBytes = new Uint8Array(pcmBuffer);
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// Pad PCM frame to FEC symbol size with length prefix.
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const symbol = this._padToSymbol(pcmBytes);
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// Feed to FEC encoder. Returns wire data when block completes.
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const fecOutput = this.fecEncoder.add_symbol(symbol);
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if (fecOutput) {
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// Block completed — send all packets (source + repair).
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const packetSize = WZP_WS_FEC_FEC_HEADER_SIZE + WZP_WS_FEC_SYMBOL_SIZE;
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const timestampMs = Date.now() - this.startTimestamp;
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for (let offset = 0; offset + packetSize <= fecOutput.length; offset += packetSize) {
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const blockId = fecOutput[offset];
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const symbolIdx = fecOutput[offset + 1];
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const isRepair = fecOutput[offset + 2] !== 0;
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const symbolData = fecOutput.slice(
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offset + WZP_WS_FEC_FEC_HEADER_SIZE,
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offset + packetSize
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);
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// Build WZP MediaHeader for this FEC symbol.
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// fecRatio ~0.5 for 50% repair overhead: encoded = round(0.5 * 63.5) = 32
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const header = this._buildHeader(
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this.seq,
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timestampMs,
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isRepair,
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0, // codecId = RawPcm16
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blockId,
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symbolIdx,
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0.5, // fecRatio
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false // hasQuality
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);
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// Wire frame: header(12) + symbol_data(2048)
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const packet = new Uint8Array(WZP_WS_FEC_HEADER_SIZE + symbolData.length);
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packet.set(header, 0);
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packet.set(symbolData, WZP_WS_FEC_HEADER_SIZE);
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this.ws.send(packet.buffer);
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this.seq = (this.seq + 1) & 0xFFFF;
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this.stats.sent++;
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}
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this._fecBlockId++;
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}
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// If block not yet complete, accumulate (no packets sent yet).
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}
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/**
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* Test FEC encode -> simulate loss -> decode in the browser.
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* Demonstrates that the WASM RaptorQ module works correctly
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* with the WZP wire protocol symbol format.
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*
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* @param {Object} [opts]
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* @param {number} [opts.blockSize=5] Source symbols per block
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* @param {number} [opts.symbolSize=2048] Padded symbol size
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* @param {number} [opts.frameSize=1920] PCM frame size in bytes
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* @param {number} [opts.dropCount=2] Number of packets to drop (simulated 30%+ loss)
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* @returns {Object} Test results
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*/
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testFec(opts) {
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if (!this.wasmReady || !this._wasmModule) {
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return { success: false, error: 'WASM FEC module not loaded' };
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}
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const blockSize = (opts && opts.blockSize) || 5;
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const symbolSize = (opts && opts.symbolSize) || WZP_WS_FEC_SYMBOL_SIZE;
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const frameSize = (opts && opts.frameSize) || 1920;
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const dropCount = (opts && opts.dropCount) || 2;
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const FEC_HDR = 3; // block_id + symbol_idx + is_repair
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const packetSize = FEC_HDR + symbolSize;
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const t0 = performance.now();
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// Create fresh encoder/decoder for the test.
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const encoder = new this._wasmModule.WzpFecEncoder(blockSize, symbolSize);
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const decoder = new this._wasmModule.WzpFecDecoder(blockSize, symbolSize);
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// Generate test frames with known data, padded to symbol size with length prefix.
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const originalFrames = [];
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const paddedSymbols = [];
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for (let i = 0; i < blockSize; i++) {
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const frame = new Uint8Array(frameSize);
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for (let j = 0; j < frameSize; j++) {
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frame[j] = ((i * 37 + 7) + j) & 0xFF;
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}
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originalFrames.push(frame);
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// Pad with length prefix (same as _padToSymbol).
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const sym = new Uint8Array(symbolSize);
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sym[0] = (frameSize >> 8) & 0xFF;
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sym[1] = frameSize & 0xFF;
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sym.set(frame, 2);
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paddedSymbols.push(sym);
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}
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// Encode: feed padded symbols to encoder.
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let wireData = null;
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for (const sym of paddedSymbols) {
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const result = encoder.add_symbol(sym);
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if (result) wireData = result;
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}
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if (!wireData) {
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wireData = encoder.flush();
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}
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// Parse wire packets.
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const packets = [];
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if (wireData) {
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for (let offset = 0; offset + packetSize <= wireData.length; offset += packetSize) {
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packets.push({
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blockId: wireData[offset],
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symbolIdx: wireData[offset + 1],
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isRepair: wireData[offset + 2] !== 0,
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data: wireData.slice(offset + FEC_HDR, offset + packetSize),
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});
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}
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}
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const sourcePackets = packets.filter(p => !p.isRepair).length;
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const repairPackets = packets.filter(p => p.isRepair).length;
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// Simulate packet loss: drop `dropCount` source packets from the front.
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const dropped = [];
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const surviving = [];
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for (let i = 0; i < packets.length; i++) {
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if (i < dropCount) {
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dropped.push(i);
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} else {
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surviving.push(packets[i]);
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}
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}
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// Decode from surviving packets.
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let decoded = null;
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for (const pkt of surviving) {
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const result = decoder.add_symbol(pkt.blockId, pkt.symbolIdx, pkt.isRepair, pkt.data);
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if (result) {
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decoded = result;
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break;
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}
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}
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// Verify decoded data: extract original frames from decoded symbols.
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let success = false;
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if (decoded) {
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// decoded is the concatenated padded symbols. Extract original frames.
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const recoveredFrames = [];
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for (let i = 0; i < blockSize; i++) {
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const symOffset = i * symbolSize;
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if (symOffset + symbolSize <= decoded.length) {
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const sym = decoded.slice(symOffset, symOffset + symbolSize);
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const len = (sym[0] << 8) | sym[1];
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recoveredFrames.push(sym.slice(2, 2 + len));
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}
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}
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success = recoveredFrames.length === blockSize;
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if (success) {
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for (let i = 0; i < blockSize && success; i++) {
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if (recoveredFrames[i].length !== originalFrames[i].length) {
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success = false;
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break;
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}
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for (let j = 0; j < originalFrames[i].length; j++) {
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if (recoveredFrames[i][j] !== originalFrames[i][j]) {
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success = false;
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break;
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}
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}
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}
|
|
}
|
|
}
|
|
|
|
// Free WASM objects.
|
|
encoder.free();
|
|
decoder.free();
|
|
|
|
const elapsed = performance.now() - t0;
|
|
|
|
return {
|
|
success,
|
|
sourcePackets,
|
|
repairPackets,
|
|
totalPackets: packets.length,
|
|
dropped: dropCount,
|
|
recovered: !!decoded,
|
|
symbolSize: symbolSize,
|
|
frameSize: frameSize,
|
|
elapsed: elapsed.toFixed(2) + 'ms',
|
|
};
|
|
}
|
|
|
|
// -----------------------------------------------------------------------
|
|
// Internal
|
|
// -----------------------------------------------------------------------
|
|
|
|
_handleMessage(event) {
|
|
if (!(event.data instanceof ArrayBuffer)) return;
|
|
const data = new Uint8Array(event.data);
|
|
if (data.length < WZP_WS_FEC_HEADER_SIZE) return;
|
|
|
|
const header = this._parseHeader(data);
|
|
if (!header) return;
|
|
|
|
this.stats.recv++;
|
|
|
|
if (!this.wasmReady || !this.fecDecoder) {
|
|
// No FEC decoder — cannot process FEC-encoded data.
|
|
return;
|
|
}
|
|
|
|
// Extract symbol data (everything after 12-byte MediaHeader).
|
|
const symbolData = data.slice(WZP_WS_FEC_HEADER_SIZE);
|
|
|
|
// Feed symbol to FEC decoder using header fields.
|
|
const decoded = this.fecDecoder.add_symbol(
|
|
header.fecBlock,
|
|
header.fecSymbol,
|
|
header.isRepair,
|
|
symbolData
|
|
);
|
|
|
|
if (decoded) {
|
|
this.stats.fecRecovered++;
|
|
|
|
// decoded is concatenated padded symbols.
|
|
// Each symbol is WZP_WS_FEC_SYMBOL_SIZE bytes with a 2-byte length prefix.
|
|
for (let off = 0; off + WZP_WS_FEC_SYMBOL_SIZE <= decoded.length; off += WZP_WS_FEC_SYMBOL_SIZE) {
|
|
const symbol = decoded.slice(off, off + WZP_WS_FEC_SYMBOL_SIZE);
|
|
const pcmBytes = this._unpadSymbol(symbol);
|
|
|
|
if (pcmBytes.length > 0 && pcmBytes.length % 2 === 0) {
|
|
const pcm = new Int16Array(
|
|
pcmBytes.buffer,
|
|
pcmBytes.byteOffset,
|
|
pcmBytes.byteLength / 2
|
|
);
|
|
if (this.onAudio) this.onAudio(pcm);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
_startStatsTimer() {
|
|
this._stopStatsTimer();
|
|
this._statsInterval = setInterval(() => {
|
|
if (!this._connected) {
|
|
this._stopStatsTimer();
|
|
return;
|
|
}
|
|
const elapsed = (Date.now() - this._startTime) / 1000;
|
|
const loss = this.stats.sent > 0
|
|
? Math.max(0, 1 - this.stats.recv / this.stats.sent)
|
|
: 0;
|
|
if (this.onStats) {
|
|
this.onStats({
|
|
sent: this.stats.sent,
|
|
recv: this.stats.recv,
|
|
loss: loss,
|
|
elapsed: elapsed,
|
|
fecRecovered: this.stats.fecRecovered,
|
|
fecReady: this.wasmReady,
|
|
});
|
|
}
|
|
}, 1000);
|
|
}
|
|
|
|
_stopStatsTimer() {
|
|
if (this._statsInterval) {
|
|
clearInterval(this._statsInterval);
|
|
this._statsInterval = null;
|
|
}
|
|
}
|
|
|
|
_status(msg) {
|
|
if (this.onStatus) this.onStatus(msg);
|
|
}
|
|
|
|
_cleanup() {
|
|
this._connected = false;
|
|
this._stopStatsTimer();
|
|
if (this.ws) {
|
|
try { this.ws.close(); } catch (_) { /* ignore */ }
|
|
this.ws = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Export
|
|
// ---------------------------------------------------------------------------
|
|
|
|
window.WZPWsFecClient = WZPWsFecClient;
|