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import fs from "fs";
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import path from "path";
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import ffmpeg from "fluent-ffmpeg";
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const recordingsDir = process.env.RECORDINGS_DIR ?? "./recordings";
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interface EventMetadata {
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userId: string;
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username: string;
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tag: string;
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startTime: number;
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endTime: number;
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durationMs: number;
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filename: string;
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}
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interface ClipInfo {
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oggPath: string;
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jsonPath: string;
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meta: EventMetadata;
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}
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async function startMuxingToAup3() {
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console.log("[muxer-aup3] Scanning recordings directory...");
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if (!fs.existsSync(recordingsDir)) {
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console.error("[muxer-aup3] Recordings directory not found.");
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return;
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}
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const clips: ClipInfo[] = [];
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// Scan user directories
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const items = fs.readdirSync(recordingsDir);
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console.log(`[muxer-aup3] Found ${items.length} directories to scan...`);
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let processedDirs = 0;
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for (const item of items) {
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const itemPath = path.join(recordingsDir, item);
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if (fs.statSync(itemPath).isDirectory()) {
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const files = fs.readdirSync(itemPath);
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for (const file of files) {
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if (file.endsWith(".json")) {
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const jsonPath = path.join(itemPath, file);
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const oggPath = jsonPath.replace(/\.json$/, ".ogg");
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if (fs.existsSync(oggPath)) {
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try {
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// Check if OGG file is valid (not empty and has reasonable size)
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const oggStats = fs.statSync(oggPath);
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if (oggStats.size === 0) {
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console.warn(`[muxer-aup3] Skipping empty OGG file: ${oggPath}`);
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continue;
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}
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// Skip files that are too small (less than 1KB likely corrupted)
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if (oggStats.size < 1024) {
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console.warn(`[muxer-aup3] Skipping too small OGG file (${oggStats.size} bytes): ${oggPath}`);
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continue;
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}
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// Check if OGG file has valid header (starts with "OggS")
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const oggBuffer = fs.readFileSync(oggPath);
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const oggHeader = oggBuffer.slice(0, 4).toString();
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if (oggHeader !== "OggS") {
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console.warn(`[muxer-aup3] Skipping invalid OGG file (bad header): ${oggPath}`);
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continue;
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}
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const meta: EventMetadata = JSON.parse(fs.readFileSync(jsonPath, "utf-8"));
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clips.push({ oggPath, jsonPath, meta });
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} catch (e) {
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console.error(`[muxer-aup3] Failed to read/parse JSON: ${jsonPath}`, e);
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}
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}
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}
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}
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processedDirs++;
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const progress = ((processedDirs / items.length) * 100).toFixed(2);
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console.log(`[muxer-aup3] Scanning progress: ${progress}% (${processedDirs}/${items.length} directories)`);
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}
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}
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if (clips.length === 0) {
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console.log("[muxer-aup3] No recording clips found to mux.");
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return;
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}
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// Sort by startTime so chronologically they are in order
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clips.sort((a, b) => a.meta.startTime - b.meta.startTime);
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// Find the global start time
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const globalStartTime = clips[0].meta.startTime;
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console.log(`[muxer-aup3] Found ${clips.length} clips. Base timestamp: ${globalStartTime}`);
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const command = ffmpeg();
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const filterParts: string[] = [];
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console.log(`[muxer-aup3] Creating audio filters for ${clips.length} clips...`);
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clips.forEach((clip, index) => {
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command.input(clip.oggPath);
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// Calculate delay relative to the global start time
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const delayMs = clip.meta.startTime - globalStartTime;
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// FFmpeg filter structure: [0:a]adelay=1000|1000[a0]
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// Setting adelay multiple times covers stereo channels.
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// We ensure all multiple channels get delayed.
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const inputSpecifier = `[${index}:a]`;
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const outputSpecifier = `[pad${index}]`;
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filterParts.push(`${inputSpecifier}adelay=${delayMs}|${delayMs}${outputSpecifier}`);
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const progress = (((index + 1) / clips.length) * 100).toFixed(2);
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console.log(`[muxer-aup3] Filter creation progress: ${progress}% (${index + 1}/${clips.length} clips)`);
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});
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// Merge them using amix
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const amixInputs = clips.map((_, i) => `[pad${i}]`).join("");
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// We add the amix command. dropout_transition=0 avoids volume drop when streams end.
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filterParts.push(`${amixInputs}amix=inputs=${clips.length}:dropout_transition=0[out]`);
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const timestamp = Date.now();
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const wavFilename = path.join(recordingsDir, `muxed-${timestamp}.wav`);
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const aup3Filename = path.join(recordingsDir, `muxed-${timestamp}.aup3`);
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console.log(`[muxer-aup3] Combining clips to WAV. This might take a while...`);
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// Using fluent-ffmpeg's complexFilter
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command
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.complexFilter(filterParts, "out")
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.audioCodec("pcm_s16le")
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.audioFrequency(44100)
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.audioChannels(2)
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.save(wavFilename)
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.on("progress", (progress) => {
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if (progress.percent) {
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console.log(`[muxer-aup3] WAV Progress: ${progress.percent.toFixed(2)}%`);
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}
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})
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.on("end", () => {
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console.log(`[muxer-aup3] WAV file created: ${wavFilename}`);
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console.log(`[muxer-aup3] Creating AUP3 project file...`);
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createAup3Project(wavFilename, aup3Filename, clips, globalStartTime);
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})
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.on("error", (err) => {
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console.error(`[muxer-aup3] FFmpeg Error:`, err);
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});
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}
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function createAup3Project(wavFilename: string, aup3Filename: string, clips: ClipInfo[], globalStartTime: number) {
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try {
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console.log(`[muxer-aup3] AUP3 Progress: Reading WAV file...`);
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// Read WAV file to get duration
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const wavStats = fs.statSync(wavFilename);
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const wavSize = wavStats.size;
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// Calculate approximate duration (assuming 44.1kHz, 16-bit, stereo)
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// Duration = (file_size - 44) / (44100 * 2 * 2) for WAV
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const duration = (wavSize - 44) / (44100 * 4);
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console.log(`[muxer-aup3] AUP3 Progress: Calculating duration... ${duration.toFixed(2)}s`);
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console.log(`[muxer-aup3] AUP3 Progress: Creating XML structure...`);
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// Create AUP3 project XML structure
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const aup3Content = `<?xml version="1.0" encoding="UTF-8"?>
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<audacityproject xmlns="http://audacity.sourceforge.net/xml/" projname="muxed" version="1.3.0" audacityversion="3.5.1">
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<tags>
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<tag name="GENRE" value=""/>
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<tag name="ARTIST" value=""/>
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<tag name="ALBUM" value=""/>
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<tag name="TRACKNUMBER" value=""/>
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<tag name="YEAR" value=""/>
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<tag name="TITLE" value="Muxed Recording"/>
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</tags>
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<wavetrack name="Muxed Audio" channel="2" linked="0" mute="0" solo="0" height="150" minimized="0" isSelected="0" rate="44100">
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<waveclip offset="0.0">
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<sequence maxsamples="262144" sampleformat="262159" numsamples="${Math.floor(duration * 44100)}">
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<waveblock start="0">
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<simpleblockfile filename="${path.basename(wavFilename)}" len="${Math.floor(duration * 44100)}" min="-1.0" max="1.0" rms="0.1"/>
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</waveblock>
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</sequence>
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<envelope numpoints="0"/>
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</waveclip>
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</wavetrack>
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<timetrack name="Time Track" height="150" minimized="0" isSelected="0">
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<envelope numpoints="0"/>
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</timetrack>
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</audacityproject>`;
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console.log(`[muxer-aup3] AUP3 Progress: Writing AUP3 file...`);
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// Write AUP3 file
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fs.writeFileSync(aup3Filename, aup3Content, "utf-8");
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console.log(`[muxer-aup3] AUP3 Progress: Creating clip info file...`);
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// Create a simple info file with clip details
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const infoFilename = aup3Filename.replace('.aup3', '-info.txt');
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const infoContent = clips.map((clip, index) => {
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const delayMs = clip.meta.startTime - globalStartTime;
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return `Clip ${index + 1}:
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User: ${clip.meta.username} (${clip.meta.userId})
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Tag: ${clip.meta.tag}
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Start Time: ${new Date(clip.meta.startTime).toISOString()}
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Delay: ${delayMs}ms
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Duration: ${clip.meta.durationMs}ms
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File: ${path.basename(clip.oggPath)}`;
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}).join('\n\n');
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fs.writeFileSync(infoFilename, infoContent, "utf-8");
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console.log(`[muxer-aup3] AUP3 Progress: 100% - Complete!`);
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console.log(`[muxer-aup3] Successfully created AUP3 project!`);
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console.log(`[muxer-aup3] WAV file: ${wavFilename}`);
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console.log(`[muxer-aup3] AUP3 file: ${aup3Filename}`);
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console.log(`[muxer-aup3] Clip info saved to: ${infoFilename}`);
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console.log(`[muxer-aup3] Total clips processed: ${clips.length}`);
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console.log(`[muxer-aup3] Duration: ${duration.toFixed(2)} seconds`);
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} catch (error) {
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console.error(`[muxer-aup3] Error creating AUP3 project:`, error);
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}
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}
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startMuxingToAup3();
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