66 lines
2.3 KiB
JavaScript
66 lines
2.3 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.FactChunk = exports.Format = exports.WaveFormat = void 0;
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/**
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* Ref: https://msdn.microsoft.com/en-us/library/windows/desktop/dd317599(v=vs.85).aspx
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*/
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var WaveFormat;
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(function (WaveFormat) {
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WaveFormat[WaveFormat["PCM"] = 1] = "PCM";
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// MPEG-4 and AAC Audio Types
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WaveFormat[WaveFormat["ADPCM"] = 2] = "ADPCM";
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WaveFormat[WaveFormat["IEEE_FLOAT"] = 3] = "IEEE_FLOAT";
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WaveFormat[WaveFormat["MPEG_ADTS_AAC"] = 5632] = "MPEG_ADTS_AAC";
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WaveFormat[WaveFormat["MPEG_LOAS"] = 5634] = "MPEG_LOAS";
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WaveFormat[WaveFormat["RAW_AAC1"] = 255] = "RAW_AAC1";
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// Dolby Audio Types
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WaveFormat[WaveFormat["DOLBY_AC3_SPDIF"] = 146] = "DOLBY_AC3_SPDIF";
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WaveFormat[WaveFormat["DVM"] = 8192] = "DVM";
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WaveFormat[WaveFormat["RAW_SPORT"] = 576] = "RAW_SPORT";
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WaveFormat[WaveFormat["ESST_AC3"] = 577] = "ESST_AC3";
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WaveFormat[WaveFormat["DRM"] = 9] = "DRM";
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WaveFormat[WaveFormat["DTS2"] = 8193] = "DTS2";
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WaveFormat[WaveFormat["MPEG"] = 80] = "MPEG";
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})(WaveFormat = exports.WaveFormat || (exports.WaveFormat = {}));
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/**
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* format chunk; chunk-id is "fmt "
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* http://soundfile.sapp.org/doc/WaveFormat/
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*/
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class Format {
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constructor(header) {
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if (header.chunkSize < 16)
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throw new Error('Invalid chunk size');
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this.len = header.chunkSize;
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}
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get(buf, off) {
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return {
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wFormatTag: buf.readUInt16LE(off),
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nChannels: buf.readUInt16LE(off + 2),
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nSamplesPerSec: buf.readUInt32LE(off + 4),
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nAvgBytesPerSec: buf.readUInt32LE(off + 8),
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nBlockAlign: buf.readUInt16LE(off + 12),
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wBitsPerSample: buf.readUInt16LE(off + 14)
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};
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}
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}
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exports.Format = Format;
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/**
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* Fact chunk; chunk-id is "fact"
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* http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
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* http://www.recordingblogs.com/wiki/fact-chunk-of-a-wave-file
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*/
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class FactChunk {
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constructor(header) {
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if (header.chunkSize < 4) {
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throw new Error('Invalid fact chunk size.');
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}
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this.len = header.chunkSize;
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}
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get(buf, off) {
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return {
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dwSampleLength: buf.readUInt32LE(off)
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};
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}
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}
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exports.FactChunk = FactChunk;
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