{ return b[o] | (b[o + 1] << 8); } function u32(b, o) { return (b[o] | (b[o + 1] << 8) | (b[o + 2] << 16) | (b[o + 3] << 24)) >>> 0; } function put32(b, o, v) { b[o] = v & 255; b[o + 1] = (v >>> 8) & 255; b[o + 2] = (v >>> 16) & 255; b[o + 3] = (v >>> 24) & 255; } function put16(b, o, v) { b[o] = v & 255; b[o + 1] = (v >>> 8) & 255; } var FORMATS = { 1: "PCM", 3: "IEEE float", 6: "A-law", 7: "mu-law", 17: "IMA ADPCM", 85: "MP3", 65534: "extensible" }; function secs(n) { var s = Math.round(n * 10) / 10; var m = Math.floor(s / 60); return (m ? m + " min " : "") + (Math.round((s - m * 60) * 10) / 10) + " s"; } function inspect(b, params) { var res = { problems: [], notes: [], out: null, info: {} }; var hasRiff = b.length >= 12 && (tag(b, 0) === "RIFF" || tag(b, 0) === "RF64") && tag(b, 8) === "WAVE"; if (b.length >= 4 && tag(b, 0) === "RF64") { res.error = "This is an RF64 (files over 4 GB) recording. This tool repairs standard 32-bit WAV files."; return res; } var fmt = null, dataStart = -1, dataDeclared = 0, chunks = []; if (hasRiff) { var o = 12; while (o + 8 <= b.length) { var id = tag(b, o), size = u32(b, o + 4); var body = o + 8; if (!/^[\x20-\x7e]{4}$/.test(id)) { res.problems.push("Unreadable chunk header at byte " + o + " - the rest of the file is treated as damaged"); break; } if (id === "fmt " && !fmt && body + 16 <= b.length) fmt = { off: body, size: Math.min(size, b.length - body) }; if (id === "data") { dataStart = body; dataDeclared = size; break; } chunks.push({ id: id, off: o, size: size }); if (body + size > b.length) { res.problems.push("Chunk \"" + id + "\" claims " + size + " bytes but the file ends first"); break; } o = body + size + (size & 1); } } else if (params.rawPcm !== true) { res.error = "This doesn't start with a RIFF/WAVE header. If it is raw audio data with the header missing, tick \"No usable header: wrap as raw PCM\" and give the sample rate, channels and bit depth."; return res; } var channels, rate, bits, fmtTag, extra = null; if (fmt) { fmtTag = u16(b, fmt.off); channels = u16(b, fmt.off + 2); rate = u32(b, fmt.off + 4); bits = u16(b, fmt.off + 14); if (fmt.size > 16) extra = b.subarray(fmt.off + 16, fmt.off + fmt.size); if (!channels || !rate || !bits || channels > 32 || bits > 64) { res.problems.push("The format chunk has implausible values (" + channels + " channels, " + rate + " Hz, " + bits + " bits)"); fmt = null; } } if (!fmt) { if (params.rawPcm !== true) { res.error = "The format chunk is missing or unreadable, so the sample rate / channels / bit depth are unknown. Tick \"No usable header: wrap as raw PCM\" and enter them."; return res; } fmtTag = params.pcmFloat === true ? 3 : 1; channels = parseInt(params.channels, 10) || 2; rate = parseInt(params.sampleRate, 10) || 44100; bits = parseInt(params.bitDepth, 10) || 16; extra = null; if (hasRiff) { res.notes.push("Using your sample rate / channels / bit depth instead of the damaged format chunk"); } else res.notes.push("Wrapping the file as raw " + (fmtTag === 3 ? "float " : "") + "PCM: " + rate + " Hz, " + channels + " channel(s), " + bits + " bit"); if (dataStart < 0) { dataStart = hasRiff ? Math.min(b.length, 12) : 0; } dataDeclared = 0; } var blockAlign = channels * Math.ceil(bits / 8); var byteRate = rate * blockAlign; if (fmt) { var declBlock = u16(b, fmt.off + 12), declRate = u32(b, fmt.off + 8); if (declBlock !== blockAlign && (fmtTag === 1 || fmtTag === 3)) res.problems.push("Block alignment was " + declBlock + ", should be " + blockAlign); if (declRate !== byteRate && (fmtTag === 1 || fmtTag === 3)) res.problems.push("Byte rate was " + declRate + ", should be " + byteRate); } if (dataStart < 0) { res.error = "No audio data chunk was found in this file."; return res; } var remaining = b.length - dataStart; var real = remaining; var trailing = null; if (hasRiff && fmt && dataDeclared > 0 && dataDeclared <= remaining && dataDeclared !== 0xFFFFFFFF) { // he

Broken WAV Header Repair

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