Copyright (c) 2017-2018 Rafael da Silva Rocha.
https://github.com/rochars/wavefile
Create, read and write wav files according to the specs.
+With wavefile you can:
+And more.
+To use it in your programs:
+npm install wavefileTo use it from the command line, install it globally:
+npm install wavefile -gYou can also download one of the files in the ./dist folder:
https://github.com/rochars/wavefile/tree/master/dist
If you installed via NPM or Yarn, import WaveFile from wavefile:
+import WaveFile from 'wavefile';
+let wav = new WaveFile();Or:
+const WaveFile = require('wavefile');
+let wav = new WaveFile();Use the compiled file in the /dist folder of this package:
+<script src="./dist/wavefile.umd.js"></script>
+<script>
+ var WaveFile = new WaveFile();
+</script>Or load it from the jsDelivr CDN:
+<script src="https://cdn.jsdelivr.net/npm/wavefile"></script>Or load it from unpkg:
+<script src="https://unpkg.com/wavefile"></script>Or load WaveFile a module using jspm:
+<script type="module">
+ import WaveFile from 'https://dev.jspm.io/wavefile';
+ console.log(new WaveFile());
+</script>All moderns browsers should work fine. Cross-browser tests are on the ROADMAP.
+Import WaveFile from wavefile.js in the ./dist folder of this package:
+import WaveFile from './dist/wavefile.js';
+let wav = new WaveFile();With wavefile you can change the bit depth and compression type of wav files on the fly before loading them in a browser player. This example uses wavefile and wavesurfer to create a browser player that supports mu-Law, A-Law, IMA ADPCM and all other formats supported by wavefile:
+https://rochars.github.io/wavefile/example
+// Load a wav file that is encoded as 4-bit IMA ADPCM:
+var wav = new WaveFile(ADPCMFileBuffer);
+
+// Decode the file as 16-bit PCM, supported by most browsers:
+wav.fromIMAADPCM();
+
+// Get the DataURI of your new, browser-friendly wav file:
+var wavDataURI = wav.toDataURI();
+
+// Load your new wav file into your player
+// ...Check out wavesurfer:
https://github.com/katspaugh/wavesurfer.js
const WaveFile = require('wavefile');
+
+// Load a wav file from disk into a WaveFile object
+let wav = new WaveFile(buffer);
+
+// Check some of the file properties
+console.log(wav.container);
+console.log(wav.chunkSize);
+console.log(wav.fmt.chunkId);
+
+// Call toBuffer() to get the bytes of the file.
+// You can write the output straight to disk:
+let wavBuffer = wav.toBuffer();
+
+// Call toDataURI() to get the file as a DataURI:
+let wavDataURI = wav.toDataURI();You must inform the number of channels, the sample rate, the bit depth and the samples (in this order).
+let wav = new WaveFile();
+
+// Create a mono wave file, 44.1 kHz, 32-bit and 4 samples
+wav.fromScratch(1, 44100, '32', [0, -2147483648, 2147483647, 4]);
+fs.writeFileSync(path, wav.toBuffer());Samples can be informed interleaved or de-interleaved. If they are de-interleaved, WaveFile will interleave them. In this example they are de-interleaved.
+// Stereo, 48 kHz, 8-bit, de-interleaved samples
+// WaveFile interleave the samples automatically
+wav.fromScratch(2, 48000, '8', [
+ [0, -2, 4, 3],
+ [0, -1, 4, 3]
+]);
+fs.writeFileSync(path, wav.toBuffer());Possible values for the bit depth are:
"4" - 4-bit IMA-ADPCM
"8" - 8-bit
"8a" - 8-bit A-Law
"8m" - 8-bit mu-Law
"16" - 16-bit
"24" - 24-bit
"32" - 32-bit
"32f" - 32-bit floating point
"64" - 64-bit floating point
You can also use any bit depth between "8" and "53", like "11", "12", "17", "20" and so on.
+Resolutions other than 4-bit, 8-bit, 16-bit, 24-bit, 32-bit (integer), 32-bit (fp) and 64-bit (fp) are implemented as WAVE_FORMAT_EXTENSIBLE and may not be supported by some players.
+You can create (or overwrite) tags on files with the WaveFile.setTag() method.
+// Write the ICMT tag with some comments to the file
+wav.setTag("ICMT", "some comments");To get the value of a tag (if it exists), use WaveFile.getTag():
+console.log(wav.getTag("ICMT"));
+// some commentsYou can delete a tag with WaveFile.deleteTag():
+wav.deleteTag("ICMT");You can create cue points using the WaveFile.setCuePoint() method. The method takes time in milliseconds, a text label and creates a cue point in the corresponding position of the file:
+wav.setCuePoint(1750, "some label for the cue point");To delete a cue point use WaveFile.deleteCuePoint() informing the index of the point. Points are ordered according to their position. The first point is indexed as 1.
+wav.deleteCuePoint(1);Mind that creating or deleting cue points will change the index of other points if they exist.
+wavefile can handle existing RIFX files and create RIFX files from scratch. Files created from scratch will default to RIFF; to create a file as RIFX you must define the container:
+wav.fromScratch(1, 48000, '16', [0, 1, -32768, 32767], {"container": "RIFX"});RIFX to RIFF and RIFF to RIFX:
+// Turn a RIFF file to a RIFX file
+wav.toRIFX();
+
+// Turn a RIFX file to a RIFF file
+wav.toRIFF();16-bit 8000 Hz mono wave files can be compressed as IMA-ADPCM:
+// Encode a 16-bit wave file as 4-bit IMA-ADPCM:
+wav.toIMAADPCM();IMA-ADPCM files compressed with wavefile will have a block align of 256 bytes.
+If the audio is not 16-bit it will be converted to 16-bit before compressing. Compressing audio with sample rate different from 8000 Hz or more than one channel is not supported and will throw errors.
+To decode 4-bit IMA-ADPCM as 16-bit linear PCM:
+// Decode 4-bit IMA-ADPCM as 16-bit:
+wav.fromIMAADPCM();Decoding always result in 16-bit audio. To decode to another bit depth:
+// Decode 4-bit IMA-ADPCM as 24-bit:
+wav.fromIMAADPCM("24");16-bit wave files (mono or stereo) can be encoded as A-Law:
+// Encode a 16-bit wave file as 8-bit A-law:
+wav.toALaw();If the audio is not 16-bit it will be converted to 16-bit before compressing.
+To decode 8-bit A-Law as 16-bit linear PCM:
+// Decode 8-bit A-Law as 16-bit:
+wav.fromALaw();Decoding always result in 16-bit audio. To decode to another bit depth:
+// Decode 8-bit A-Law as 24-bit:
+wav.fromALaw("24");16-bit wave files (mono or stereo) can be encoded as mu-Law:
+// Encode a 16-bit wave file as 8-bit mu-law:
+wav.toMuLaw();If the audio is not 16-bit it will be converted to 16-bit before compressing.
+To decode 8-bit mu-Law as 16-bit linear PCM:
+// Decode 8-bit mu-Law as 16-bit:
+wav.fromMuLaw();Decoding always result in 16-bit audio. To decode to another bit depth:
+// Decode 8-bit mu-Law as 24-bit:
+wav.fromMuLaw("24");You can change the bit depth of the audio with the toBitDepth(bitDepth) method.
+// Load a wav file with 32-bit audio
+let wav = new WaveFile(fs.readFileSync("32bit-file.wav"));
+
+// Change the bit depth to 24-bit
+wav.toBitDepth("24");
+
+// Write the new 24-bit file
+fs.writeFileSync("24bit-file.wav", wav.toBuffer());To add BWF data to a file you can use the bext property:
+// Load a wav file with no "bext"
+let wav = new WaveFile(fs.readFileSync("32bit-file.wav"));
+
+// Add some BWF metadata
+wav.bext.originator = "wavefile";
+
+// Write the new BWF file
+fs.writeFileSync("32bit-file-with-bext.wav", wav.toBuffer());By default wavefile will not insert a "bext" chunk in new files or in files that do not already have a "bext" chunk unless a property of WaveFile.bext is changed from it's default value. See below the full list of properties in WaveFile.bext.
+wavefile have limited support of RF64 files. It possible to read (at least some) RF64 files, but changing the bit depth or applying compression to the samples will result in a RIFF file.
+wavefile can run as a command line tool. To use wavefile from the command line, install it globally:
+npm install wavefile -gTo see the available options:
+wavefile --helpThe available options:
+ --bitdepth Ex: wavefile input.wav --bitdepth=32f output.wav
+ Change the bit depth.
+ The input file is not affected.
+ Possible values: 8, 16, 24, 32, 32f, 64
+
+ --compress Ex: wavefile input.wav --compress=adpcm output.wav
+ Apply compression to the file.
+ The input file is not affected.
+ Possible values: adpcm, alaw, mulaw
+
+ --tag Ex: wavefile input.wav --tag=ICRD
+ Print the value of tag if the tag exists.
+
+ --list-tags Ex: wavefile input.wav --list-tags
+ Print all tags of the file.
+
+ --list-cue Ex: wavefile input.wav --list-cue
+ Print all the cue points of the file.
+
+ --bits Ex: wavefile input.wav --bits
+ Print the bit depth of the file.
+
+ --rate Ex: wavefile input.wav --rate
+ Print the sample rate of the file.
+
+ --help Ex: --help
+ Show this help page.To create a WaveFile object:
+/**
+ * @param {?Uint8Array} bytes A wave file buffer.
+ * @throws {Error} If no "RIFF" chunk is found.
+ * @throws {Error} If no "fmt " chunk is found.
+ * @throws {Error} If no "data" chunk is found.
+ */
+WaveFile(bytes=null);/**
+ * Set up the WaveFile object based on the arguments passed.
+ * @param {number} numChannels The number of channels
+ * (Integer numbers: 1 for mono, 2 stereo and so on).
+ * @param {number} sampleRate The sample rate.
+ * Integer numbers like 8000, 44100, 48000, 96000, 192000.
+ * @param {string} bitDepth The audio bit depth code.
+ * One of "4", "8", "8a", "8m", "16", "24", "32", "32f", "64"
+ * or any value between "8" and "32" (like "12").
+ * @param {!Array<number>|!Array<!Array<number>>|!ArrayBufferView} samples
+ * The samples. Must be in the correct range according to the bit depth.
+ * @param {?Object} options Optional. Used to force the container
+ * as RIFX with {"container": "RIFX"}
+ * @throws {Error} If any argument does not meet the criteria.
+ */
+WaveFile.fromScratch(numChannels, sampleRate, bitDepth, samples, options={}) {}
+
+/**
+ * Set up the WaveFile object from a byte buffer.
+ * @param {!Uint8Array} bytes The buffer.
+ * @throws {Error} If container is not RIFF, RIFX or RF64.
+ * @throws {Error} If no "fmt " chunk is found.
+ * @throws {Error} If no "data" chunk is found.
+ */
+WaveFile.fromBuffer(bytes) {}
+
+/**
+ * Return a byte buffer representig the WaveFile object as a .wav file.
+ * The return value of this method can be written straight to disk.
+ * @return {!Uint8Array} A .wav file.
+ * @throws {Error} If any property of the object appears invalid.
+ */
+WaveFile.toBuffer() {}
+
+/**
+ * Use a .wav file encoded as a base64 string to load the WaveFile object.
+ * @param {string} base64String A .wav file as a base64 string.
+ * @throws {Error} If any property of the object appears invalid.
+ */
+WaveFile.fromBase64(base64String) {}
+
+/**
+ * Return a base64 string representig the WaveFile object as a .wav file.
+ * @return {string} A .wav file as a base64 string.
+ * @throws {Error} If any property of the object appears invalid.
+ */
+WaveFile.toBase64() {}
+
+/**
+ * Return a DataURI string representig the WaveFile object as a .wav file.
+ * The return of this method can be used to load the audio in browsers.
+ * @return {string} A .wav file as a DataURI.
+ * @throws {Error} If any property of the object appears invalid.
+ */
+WaveFile.toDataURI() {}
+
+/**
+ * Use a .wav file encoded as a DataURI to load the WaveFile object.
+ * @param {string} dataURI A .wav file as DataURI.
+ * @throws {Error} If any property of the object appears invalid.
+ */
+WaveFile.fromDataURI(dataURI) {}
+
+/**
+ * Force a file as RIFF.
+ */
+WaveFile.toRIFF() {}
+
+/**
+ * Force a file as RIFX.
+ */
+WaveFile.toRIFX() {}
+
+/**
+ * Change the bit depth of the samples.
+ * @param {string} bitDepth The new bit depth of the samples.
+ * One of "8" ... "32" (integers), "32f" or "64" (floats)
+ * @param {boolean} changeResolution A boolean indicating if the
+ * resolution of samples should be actually changed or not.
+ * @throws {Error} If the bit depth is not valid.
+ */
+WaveFile.toBitDepth(bitDepth, changeResolution=true) {}
+
+/**
+ * Encode a 16-bit wave file as 4-bit IMA ADPCM.
+ * @throws {Error} If sample rate is not 8000.
+ * @throws {Error} If number of channels is not 1.
+ */
+WaveFile.toIMAADPCM() {}
+
+/**
+ * Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file.
+ * @param {string} bitDepth The new bit depth of the samples.
+ * One of "8" ... "32" (integers), "32f" or "64" (floats).
+ * Optional. Default is 16.
+ */
+WaveFile.fromIMAADPCM(bitDepth='16') {}
+
+/**
+ * Encode 16-bit wave file as 8-bit A-Law.
+ */
+WaveFile.toALaw() {}
+
+/**
+ * Decode a 8-bit A-Law wave file into a 16-bit wave file.
+ * @param {string} bitDepth The new bit depth of the samples.
+ * One of "8" ... "32" (integers), "32f" or "64" (floats).
+ * Optional. Default is 16.
+ */
+WaveFile.fromALaw(bitDepth='16') {}
+
+/**
+ * Encode 16-bit wave file as 8-bit mu-Law.
+ */
+WaveFile.toMuLaw() {}
+
+/**
+ * Decode a 8-bit mu-Law wave file into a 16-bit wave file.
+ * @param {string} bitDepth The new bit depth of the samples.
+ * One of "8" ... "32" (integers), "32f" or "64" (floats).
+ * Optional. Default is 16.
+ */
+WaveFile.fromMuLaw(bitDepth='16') {}
+
+/**
+ * Write a RIFF tag in the INFO chunk. If the tag do not exist,
+ * then it is created. It if exists, it is overwritten.
+ * @param {string} tag The tag name.
+ * @param {string} value The tag value.
+ * @throws {Error} If the tag name is not valid.
+ */
+WaveFile.setTag(tag, value) {}
+
+/**
+ * Return the value of a RIFF tag in the INFO chunk.
+ * @param {string} tag The tag name.
+ * @return {?string} The value if the tag is found, null otherwise.
+ */
+WaveFile.getTag(tag) {}
+
+/**
+ * Remove a RIFF tag in the INFO chunk.
+ * @param {string} tag The tag name.
+ * @return {boolean} True if a tag was deleted.
+ */
+WaveFile.deleteTag(tag) {}
+
+/**
+ * Return a Object<tag, value> with the RIFF tags in the file.
+ * @return {!Object<string, string>} The file tags.
+ */
+WaveFile.listTags() {}
+
+/**
+ * Create a cue point in the wave file.
+ * @param {number} position The cue point position in milliseconds.
+ * @param {string} labl The LIST adtl labl text of the marker. Optional.
+ */
+WaveFile.setCuePoint(position, labl='') {}
+
+/**
+ * Remove a cue point from a wave file.
+ * @param {number} index the index of the point. First is 1,
+ * second is 2, and so on.
+ */
+WaveFile.deleteCuePoint(index) {}
+
+/**
+ * Return an array with all cue points in the file, in the order they appear
+ * in the file.
+ * The difference between this method and using the list in WaveFile.cue
+ * is that the return value of this method includes the position in
+ * milliseconds of each cue point (WaveFile.cue only have the sample offset)
+ * @return {!Array<!Object>}
+ * @private
+ */
+listCuePoints() {}
+
+/**
+ * Update the label of a cue point.
+ * @param {number} pointIndex The ID of the cue point.
+ * @param {string} label The new text for the label.
+ */
+WaveFile.updateLabel(pointIndex, label) {}
+
+/**
+ * Return the sample at a given index.
+ * @param {number} index The sample index.
+ * @return {number} The sample.
+ * @throws {Error} If the sample index is off range.
+ */
+WaveFile.getSample(index) {};
+
+/**
+ * Set the sample at a given index.
+ * @param {number} index The sample index.
+ * @param {number} sample The sample.
+ * @throws {Error} If the sample index is off range.
+ */
+WaveFile.setSample(index, sample) {};This method returns a list like this:
+[
+ {
+ milliseconds: 1000, // the position in milliseconds
+ dwPosition: 8000, // the sample offset of the point
+ label: "cue marker 2" // the label of the point
+ },
+]The list order reflects the order of the points in the file.
+/**
+ * The container identifier.
+ * "RIFF", "RIFX" and "RF64" are supported.
+ * @type {string}
+ */
+WaveFile.container = '';
+/**
+ * @type {number}
+ */
+WaveFile.chunkSize = 0;
+/**
+ * The format.
+ * Always 'WAVE'.
+ * @type {string}
+ */
+WaveFile.format = '';
+/**
+ * The data of the "fmt" chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.fmt = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {number} */
+ audioFormat: 0,
+ /** @type {number} */
+ numChannels: 0,
+ /** @type {number} */
+ sampleRate: 0,
+ /** @type {number} */
+ byteRate: 0,
+ /** @type {number} */
+ blockAlign: 0,
+ /** @type {number} */
+ bitsPerSample: 0,
+ /** @type {number} */
+ cbSize: 0,
+ /** @type {number} */
+ validBitsPerSample: 0,
+ /** @type {number} */
+ dwChannelMask: 0,
+ /**
+ * 4 32-bit values representing a 128-bit ID
+ * @type {!Array<number>}
+ */
+ subformat: []
+};
+/**
+ * The data of the "fact" chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.fact = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {number} */
+ dwSampleLength: 0
+};
+/**
+ * The data of the "cue " chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.cue = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {number} */
+ dwCuePoints: 0,
+ /** @type {!Array<!Object>} */
+ points: [],
+};
+/**
+ * The data of the "smpl" chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.smpl = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {number} */
+ dwManufacturer: 0,
+ /** @type {number} */
+ dwProduct: 0,
+ /** @type {number} */
+ dwSamplePeriod: 0,
+ /** @type {number} */
+ dwMIDIUnityNote: 0,
+ /** @type {number} */
+ dwMIDIPitchFraction: 0,
+ /** @type {number} */
+ dwSMPTEFormat: 0,
+ /** @type {number} */
+ dwSMPTEOffset: 0,
+ /** @type {number} */
+ dwNumSampleLoops: 0,
+ /** @type {number} */
+ dwSamplerData: 0,
+ /** @type {!Array<!Object>} */
+ loops: [],
+};
+/**
+ * The data of the "bext" chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.bext = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {string} */
+ description: '', //256
+ /** @type {string} */
+ originator: '', //32
+ /** @type {string} */
+ originatorReference: '', //32
+ /** @type {string} */
+ originationDate: '', //10
+ /** @type {string} */
+ originationTime: '', //8
+ /**
+ * 2 32-bit values, timeReference high and low
+ * @type {!Array<number>}
+ */
+ timeReference: [0, 0],
+ /** @type {number} */
+ version: 0, //WORD
+ /** @type {string} */
+ UMID: '', // 64 chars
+ /** @type {number} */
+ loudnessValue: 0, //WORD
+ /** @type {number} */
+ loudnessRange: 0, //WORD
+ /** @type {number} */
+ maxTruePeakLevel: 0, //WORD
+ /** @type {number} */
+ maxMomentaryLoudness: 0, //WORD
+ /** @type {number} */
+ maxShortTermLoudness: 0, //WORD
+ /** @type {string} */
+ reserved: '', //180
+ /** @type {string} */
+ codingHistory: '' // string, unlimited
+};
+/**
+ * The data of the "ds64" chunk.
+ * Used only with RF64 files.
+ * @type {!Object<string, *>}
+ */
+WaveFile.ds64 = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {number} */
+ riffSizeHigh: 0, // DWORD
+ /** @type {number} */
+ riffSizeLow: 0, // DWORD
+ /** @type {number} */
+ dataSizeHigh: 0, // DWORD
+ /** @type {number} */
+ dataSizeLow: 0, // DWORD
+ /** @type {number} */
+ originationTime: 0, // DWORD
+ /** @type {number} */
+ sampleCountHigh: 0, // DWORD
+ /** @type {number} */
+ sampleCountLow: 0, // DWORD
+ /** @type {number} */
+ //"tableLength": 0, // DWORD
+ /** @type {!Array<number>} */
+ //"table": []
+};
+/**
+ * The data of the "data" chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.data = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {!Uint8Array} */
+ samples: new Uint8Array(0)
+};
+/**
+ * The data of the "LIST" chunks.
+ * Each item in this list look like this:
+ * {
+ * chunkId: '',
+ * chunkSize: 0,
+ * format: '',
+ * subChunks: []
+ * }
+ * @type {!Array<!Object>}
+ */
+WaveFile.LIST = [];
+/**
+ * The data of the "junk" chunk.
+ * @type {!Object<string, *>}
+ */
+WaveFile.junk = {
+ /** @type {string} */
+ chunkId: '',
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {!Array<number>} */
+ chunkData: []
+};
+/**
+ * The bit depth code according to the samples.
+ * @type {string}
+ */
+WaveFile.bitDepth = '';Items in cue.points are objects that look like this:
+{
+ /** @type {number} */
+ dwName: 0, // a cue point ID
+ /** @type {number} */
+ dwPosition: 0,
+ /** @type {number} */
+ fccChunk: 0,
+ /** @type {number} */
+ dwChunkStart: 0,
+ /** @type {number} */
+ dwBlockStart: 0,
+ /** @type {number} */
+ dwSampleOffset: 0
+}Items in smpl.loops are objects that look like this:
+{
+ /** @type {string} */
+ dwName: '', // a cue point ID
+ /** @type {number} */
+ dwType: 0,
+ /** @type {number} */
+ dwStart: 0,
+ /** @type {number} */
+ dwEnd: 0,
+ /** @type {number} */
+ dwFraction: 0,
+ /** @type {number} */
+ dwPlayCount: 0
+}"LIST" chunk data is stored as follows:
+/**
+ * An array of the "LIST" chunks present in the file.
+ * @type {!Array<!Object>}
+ */
+WaveFile.LIST = [];Items in WaveFile.LIST are objects that look like this:
+{
+ /** @type {string} */
+ chunkId: '', // always 'LIST'
+ /** @type {number} */
+ chunkSize: 0,
+ /** @type {string} */
+ format: '', // 'adtl' or 'INFO'
+ /** @type {!Array<!Object>} */
+ subChunks: []
+};Where "subChunks" are the subChunks of the "LIST" chunk. A single file may have many "LIST" chunks as long as their formats ("INFO", "adtl", etc) are not the same. wavefile can read and write "LIST" chunks of format "INFO" and "adtl".
+For "LIST" chunks with the "INFO" format, "subChunks" will be an array of objects like this:
+{
+ /** @type {string} */
+ chunkId: '', // some RIFF tag
+ /** @type {number} */
+ chunkSize 0,
+ /** @type {string} */
+ value: ''
+}Where "chunkId" may be any RIFF tag:
https://sno.phy.queensu.ca/~phil/exiftool/TagNames/RIFF.html#Info
Samples are stored in WaveFile.data.samples as a Uint8Array representing a byte buffer. Once you inform the samples with fromScratch() they are packed as bytes and stay that way.
+To get and set samples in a WaveFile instance you should use WaveFile.getSample(index) and WaveFile.setSample(index, sample). The 'index' is the index of the sample in the sample array, not the index of the bytes in data.samples.
+Example:
+wav = new WaveFile();
+
+// some samples
+let samples = [561, 1200, 423];
+
+// Create a WaveFile using the samples
+wav.fromScratch(1, 8000, "16", samples);
+
+// Getting and setting a sample in the WaveFile instance:
+wav.getSample(1); // return 1200, the value of the second sample
+wav.setSample(1, 10); // change the second sample to 10
+wav.getSample(1); // return 10, the new value of the second sampleRange:
+wavefile welcomes all contributions from anyone willing to work in good faith with other contributors and the community. No contribution is too small and all contributions are valued.
+See CONTRIBUTING.md for details.
+wavefile code should follow the Google JavaScript Style Guide:
https://google.github.io/styleguide/jsguide.html
This project is bound by a Code of Conduct: The Contributor Covenant, version 1.4, also available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+https://tech.ebu.ch/docs/tech/tech3285.pdf
https://tech.ebu.ch/docs/tech/tech3306-2009.pdf
http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
https://www.loc.gov/preservation/digital/formats/fdd/fdd000356.shtml
http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf
https://sites.google.com/site/musicgapi/technical-documents/wav-file-format
http://www.neurophys.wisc.edu/auditory/riff-format.txt
https://sno.phy.queensu.ca/~phil/exiftool/TagNames/RIFF.html#Info
https://github.com/erikd/libsndfile
https://gist.github.com/hackNightly/3776503
https://github.com/chirlu/sox/blob/master/src/wav.c
https://developercertificate.org/
https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
https://google.github.io/styleguide/jsguide.html
Copyright (c) 2017-2018 Rafael da Silva Rocha.
+Permission is hereby granted, free of charge, to any person obtaining +a copy of this software and associated documentation files (the +"Software"), to deal in the Software without restriction, including +without limitation the rights to use, copy, modify, merge, publish, +distribute, sublicense, and/or sell copies of the Software, and to +permit persons to whom the Software is furnished to do so, subject to +the following conditions:
+The above copyright notice and this permission notice shall be +included in all copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.