rochars /
wavefile
| Conditions | 1 |
| Total Lines | 228 |
| Code Lines | 86 |
| Lines | 0 |
| Ratio | 0 % |
| Changes | 0 | ||
Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
| 1 | /* |
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| 39 | * A class to read and write wav files. |
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| 40 | * @extends WaveFileReader |
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| 41 | */ |
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| 42 | export default class WaveFileParser extends WaveFileReader { |
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| 43 | |||
| 44 | /** |
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| 45 | * Return a byte buffer representig the WaveFileParser object as a .wav file. |
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| 46 | * The return value of this method can be written straight to disk. |
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| 47 | * @return {!Uint8Array} A wav file. |
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| 48 | * @throws {Error} If bit depth is invalid. |
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| 49 | * @throws {Error} If the number of channels is invalid. |
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| 50 | * @throws {Error} If the sample rate is invalid. |
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| 51 | */ |
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| 52 | toBuffer() { |
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| 53 | this.validateWavHeader(); |
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| 54 | return this.writeWavBuffer_(); |
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| 55 | } |
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| 56 | |||
| 57 | /** |
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| 58 | * Return the sample at a given index. |
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| 59 | * @param {number} index The sample index. |
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| 60 | * @return {number} The sample. |
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| 61 | * @throws {Error} If the sample index is off range. |
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| 62 | */ |
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| 63 | getSample(index) { |
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| 64 | index = index * (this.dataType.bits / 8); |
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| 65 | if (index + this.dataType.bits / 8 > this.data.samples.length) { |
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| 66 | throw new Error('Range error'); |
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| 67 | } |
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| 68 | return unpack( |
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| 69 | this.data.samples.slice(index, index + this.dataType.bits / 8), |
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| 70 | this.dataType); |
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| 71 | } |
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| 72 | |||
| 73 | /** |
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| 74 | * Set the sample at a given index. |
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| 75 | * @param {number} index The sample index. |
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| 76 | * @param {number} sample The sample. |
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| 77 | * @throws {Error} If the sample index is off range. |
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| 78 | */ |
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| 79 | setSample(index, sample) { |
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| 80 | index = index * (this.dataType.bits / 8); |
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| 81 | if (index + this.dataType.bits / 8 > this.data.samples.length) { |
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| 82 | throw new Error('Range error'); |
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| 83 | } |
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| 84 | packTo(sample, this.dataType, this.data.samples, index); |
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| 85 | } |
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| 86 | |||
| 87 | /** |
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| 88 | * Validate the header of the file. |
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| 89 | * @throws {Error} If bit depth is invalid. |
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| 90 | * @throws {Error} If the number of channels is invalid. |
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| 91 | * @throws {Error} If the sample rate is invalid. |
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| 92 | * @ignore |
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| 93 | * @protected |
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| 94 | */ |
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| 95 | validateWavHeader() { |
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| 96 | this.validateBitDepth_(); |
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| 97 | if (!validateNumChannels(this.fmt.numChannels, this.fmt.bitsPerSample)) { |
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| 98 | throw new Error('Invalid number of channels.'); |
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| 99 | } |
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| 100 | if (!validateSampleRate( |
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| 101 | this.fmt.numChannels, this.fmt.bitsPerSample, this.fmt.sampleRate)) { |
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| 102 | throw new Error('Invalid sample rate.'); |
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| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | /** |
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| 107 | * Return a .wav file byte buffer with the data from the WaveFileParser object. |
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| 108 | * The return value of this method can be written straight to disk. |
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| 109 | * @return {!Uint8Array} The wav file bytes. |
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| 110 | * @private |
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| 111 | */ |
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| 112 | writeWavBuffer_() { |
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| 113 | this.uInt16_.be = this.container === 'RIFX'; |
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| 114 | this.uInt32_.be = this.uInt16_.be; |
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| 115 | /** @type {!Array<!Array<number>>} */ |
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| 116 | let fileBody = [ |
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| 117 | this.getJunkBytes_(), |
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| 118 | this.getDs64Bytes_(), |
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| 119 | this.getBextBytes_(), |
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| 120 | this.getFmtBytes_(), |
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| 121 | this.getFactBytes_(), |
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| 122 | packString(this.data.chunkId), |
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| 123 | pack(this.data.samples.length, this.uInt32_), |
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| 124 | this.data.samples, |
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| 125 | this.getCueBytes_(), |
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| 126 | this.getSmplBytes_(), |
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| 127 | this.getLISTBytes_() |
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| 128 | ]; |
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| 129 | /** @type {number} */ |
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| 130 | let fileBodyLength = 0; |
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| 131 | for (let i=0; i<fileBody.length; i++) { |
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| 132 | fileBodyLength += fileBody[i].length; |
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| 133 | } |
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| 134 | /** @type {!Uint8Array} */ |
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| 135 | let file = new Uint8Array(fileBodyLength + 12); |
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| 136 | /** @type {number} */ |
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| 137 | let index = 0; |
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| 138 | index = packStringTo(this.container, file, index); |
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| 139 | index = packTo(fileBodyLength + 4, this.uInt32_, file, index); |
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| 140 | index = packStringTo(this.format, file, index); |
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| 141 | for (let i=0; i<fileBody.length; i++) { |
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| 142 | file.set(fileBody[i], index); |
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| 143 | index += fileBody[i].length; |
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| 144 | } |
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| 145 | return file; |
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| 146 | } |
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| 147 | |||
| 148 | /** |
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| 149 | * Return the bytes of the 'bext' chunk. |
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| 150 | * @private |
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| 151 | */ |
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| 152 | getBextBytes_() { |
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| 153 | /** @type {!Array<number>} */ |
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| 154 | let bytes = []; |
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| 155 | this.enforceBext_(); |
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| 156 | if (this.bext.chunkId) { |
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| 157 | this.bext.chunkSize = 602 + this.bext.codingHistory.length; |
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| 158 | bytes = bytes.concat( |
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| 159 | packString(this.bext.chunkId), |
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| 160 | pack(602 + this.bext.codingHistory.length, this.uInt32_), |
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| 161 | writeString(this.bext.description, 256), |
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| 162 | writeString(this.bext.originator, 32), |
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| 163 | writeString(this.bext.originatorReference, 32), |
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| 164 | writeString(this.bext.originationDate, 10), |
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| 165 | writeString(this.bext.originationTime, 8), |
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| 166 | pack(this.bext.timeReference[0], this.uInt32_), |
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| 167 | pack(this.bext.timeReference[1], this.uInt32_), |
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| 168 | pack(this.bext.version, this.uInt16_), |
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| 169 | writeString(this.bext.UMID, 64), |
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| 170 | pack(this.bext.loudnessValue, this.uInt16_), |
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| 171 | pack(this.bext.loudnessRange, this.uInt16_), |
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| 172 | pack(this.bext.maxTruePeakLevel, this.uInt16_), |
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| 173 | pack(this.bext.maxMomentaryLoudness, this.uInt16_), |
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| 174 | pack(this.bext.maxShortTermLoudness, this.uInt16_), |
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| 175 | writeString(this.bext.reserved, 180), |
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| 176 | writeString( |
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| 177 | this.bext.codingHistory, this.bext.codingHistory.length)); |
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| 178 | } |
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| 179 | return bytes; |
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| 180 | } |
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| 181 | |||
| 182 | /** |
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| 183 | * Make sure a 'bext' chunk is created if BWF data was created in a file. |
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| 184 | * @private |
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| 185 | */ |
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| 186 | enforceBext_() { |
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| 187 | for (let prop in this.bext) { |
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| 188 | if (this.bext.hasOwnProperty(prop)) { |
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| 189 | if (this.bext[prop] && prop != 'timeReference') { |
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| 190 | this.bext.chunkId = 'bext'; |
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| 191 | break; |
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| 192 | } |
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| 193 | } |
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| 194 | } |
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| 195 | if (this.bext.timeReference[0] || this.bext.timeReference[1]) { |
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| 196 | this.bext.chunkId = 'bext'; |
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| 197 | } |
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| 198 | } |
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| 199 | |||
| 200 | /** |
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| 201 | * Return the bytes of the 'ds64' chunk. |
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| 202 | * @return {!Array<number>} The 'ds64' chunk bytes. |
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| 203 | * @private |
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| 204 | */ |
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| 205 | getDs64Bytes_() { |
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| 206 | /** @type {!Array<number>} */ |
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| 207 | let bytes = []; |
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| 208 | if (this.ds64.chunkId) { |
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| 209 | bytes = bytes.concat( |
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| 210 | packString(this.ds64.chunkId), |
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| 211 | pack(this.ds64.chunkSize, this.uInt32_), |
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| 212 | pack(this.ds64.riffSizeHigh, this.uInt32_), |
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| 213 | pack(this.ds64.riffSizeLow, this.uInt32_), |
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| 214 | pack(this.ds64.dataSizeHigh, this.uInt32_), |
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| 215 | pack(this.ds64.dataSizeLow, this.uInt32_), |
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| 216 | pack(this.ds64.originationTime, this.uInt32_), |
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| 217 | pack(this.ds64.sampleCountHigh, this.uInt32_), |
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| 218 | pack(this.ds64.sampleCountLow, this.uInt32_)); |
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| 219 | } |
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| 220 | //if (this.ds64.tableLength) { |
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| 221 | // ds64Bytes = ds64Bytes.concat( |
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| 222 | // pack(this.ds64.tableLength, this.uInt32_), |
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| 223 | // this.ds64.table); |
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| 224 | //} |
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| 225 | return bytes; |
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| 226 | } |
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| 227 | |||
| 228 | /** |
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| 229 | * Return the bytes of the 'cue ' chunk. |
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| 230 | * @return {!Array<number>} The 'cue ' chunk bytes. |
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| 231 | * @private |
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| 232 | */ |
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| 233 | getCueBytes_() { |
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| 234 | /** @type {!Array<number>} */ |
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| 235 | let bytes = []; |
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| 236 | if (this.cue.chunkId) { |
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| 237 | /** @type {!Array<number>} */ |
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| 238 | let cuePointsBytes = this.getCuePointsBytes_(); |
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| 239 | bytes = bytes.concat( |
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| 240 | packString(this.cue.chunkId), |
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| 241 | pack(cuePointsBytes.length + 4, this.uInt32_), |
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| 242 | pack(this.cue.dwCuePoints, this.uInt32_), |
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| 243 | cuePointsBytes); |
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| 244 | } |
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| 245 | return bytes; |
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| 246 | } |
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| 247 | |||
| 248 | /** |
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| 249 | * Return the bytes of the 'cue ' points. |
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| 250 | * @return {!Array<number>} The 'cue ' points as an array of bytes. |
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| 251 | * @private |
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| 252 | */ |
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| 253 | getCuePointsBytes_() { |
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| 254 | /** @type {!Array<number>} */ |
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| 255 | let points = []; |
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| 256 | for (let i=0; i<this.cue.dwCuePoints; i++) { |
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| 257 | points = points.concat( |
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| 258 | pack(this.cue.points[i].dwName, this.uInt32_), |
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| 259 | pack(this.cue.points[i].dwPosition, this.uInt32_), |
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| 260 | packString(this.cue.points[i].fccChunk), |
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| 261 | pack(this.cue.points[i].dwChunkStart, this.uInt32_), |
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| 262 | pack(this.cue.points[i].dwBlockStart, this.uInt32_), |
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| 263 | pack(this.cue.points[i].dwSampleOffset, this.uInt32_)); |
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| 264 | } |
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| 265 | return points; |
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| 266 | } |
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| 267 | |||
| 502 |
