rochars /
wavefile
| Conditions | 2 |
| Total Lines | 233 |
| Code Lines | 88 |
| 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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| 48 | */ |
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| 49 | toBuffer() { |
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| 50 | this.validateWavHeader(); |
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| 51 | return this.writeWavBuffer_(); |
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| 52 | } |
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| 53 | |||
| 54 | /** |
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| 55 | * Return the sample at a given index. |
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| 56 | * @param {number} index The sample index. |
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| 57 | * @return {number} The sample. |
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| 58 | * @throws {Error} If the sample index is off range. |
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| 59 | */ |
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| 60 | getSample(index) { |
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| 61 | index = index * (this.dataType.bits / 8); |
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| 62 | if (index + this.dataType.bits / 8 > this.data.samples.length) { |
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| 63 | throw new Error('Range error'); |
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| 64 | } |
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| 65 | return unpack( |
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| 66 | this.data.samples.slice(index, index + this.dataType.bits / 8), |
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| 67 | this.dataType); |
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| 68 | } |
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| 69 | |||
| 70 | /** |
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| 71 | * Set the sample at a given index. |
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| 72 | * @param {number} index The sample index. |
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| 73 | * @param {number} sample The sample. |
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| 74 | * @throws {Error} If the sample index is off range. |
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| 75 | */ |
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| 76 | setSample(index, sample) { |
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| 77 | index = index * (this.dataType.bits / 8); |
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| 78 | if (index + this.dataType.bits / 8 > this.data.samples.length) { |
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| 79 | throw new Error('Range error'); |
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| 80 | } |
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| 81 | packTo(sample, this.dataType, this.data.samples, index); |
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| 82 | } |
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| 83 | |||
| 84 | /** |
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| 85 | * Validate the header of the file. |
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| 86 | * @throws {Error} If bit depth is invalid. |
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| 87 | * @throws {Error} If the number of channels is invalid. |
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| 88 | * @throws {Error} If the sample rate is invalid. |
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| 89 | * @protected |
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| 90 | */ |
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| 91 | validateWavHeader() { |
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| 92 | this.validateBitDepth_(); |
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| 93 | if (!validateNumChannels(this.fmt.numChannels, this.fmt.bitsPerSample)) { |
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| 94 | throw new Error('Invalid number of channels.'); |
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| 95 | } |
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| 96 | if (!validateSampleRate( |
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| 97 | this.fmt.numChannels, this.fmt.bitsPerSample, this.fmt.sampleRate)) { |
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| 98 | throw new Error('Invalid sample rate.'); |
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| 99 | } |
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| 100 | } |
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| 101 | |||
| 102 | /** |
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| 103 | * Return a .wav file byte buffer with the data from the WaveFileParser object. |
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| 104 | * The return value of this method can be written straight to disk. |
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| 105 | * @return {!Uint8Array} The wav file bytes. |
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| 106 | * @private |
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| 107 | */ |
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| 108 | writeWavBuffer_() { |
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| 109 | this.uInt16_.be = this.container === 'RIFX'; |
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| 110 | this.uInt32_.be = this.uInt16_.be; |
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| 111 | /** @type {!Array<!Array<number>>} */ |
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| 112 | let fileBody = [ |
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| 113 | this.getJunkBytes_(), |
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| 114 | this.getDs64Bytes_(), |
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| 115 | this.getBextBytes_(), |
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| 116 | this.getFmtBytes_(), |
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| 117 | this.getFactBytes_(), |
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| 118 | packString(this.data.chunkId), |
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| 119 | pack(this.data.samples.length, this.uInt32_), |
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| 120 | this.data.samples, |
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| 121 | this.getCueBytes_(), |
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| 122 | this.getSmplBytes_(), |
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| 123 | this.getLISTBytes_() |
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| 124 | ]; |
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| 125 | /** @type {number} */ |
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| 126 | let fileBodyLength = 0; |
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| 127 | for (let i=0; i<fileBody.length; i++) { |
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| 128 | fileBodyLength += fileBody[i].length; |
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| 129 | } |
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| 130 | /** @type {!Uint8Array} */ |
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| 131 | let file = new Uint8Array(fileBodyLength + 12); |
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| 132 | /** @type {number} */ |
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| 133 | let index = 0; |
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| 134 | index = packStringTo(this.container, file, index); |
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| 135 | index = packTo(fileBodyLength + 4, this.uInt32_, file, index); |
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| 136 | index = packStringTo(this.format, file, index); |
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| 137 | for (let i=0; i<fileBody.length; i++) { |
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| 138 | file.set(fileBody[i], index); |
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| 139 | index += fileBody[i].length; |
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| 140 | } |
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| 141 | return file; |
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| 142 | } |
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| 143 | |||
| 144 | /** |
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| 145 | * Return the bytes of the 'bext' chunk. |
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| 146 | * @private |
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| 147 | */ |
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| 148 | getBextBytes_() { |
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| 149 | /** @type {!Array<number>} */ |
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| 150 | let bytes = []; |
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| 151 | this.enforceBext_(); |
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| 152 | if (this.bext.chunkId) { |
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| 153 | this.bext.chunkSize = 602 + this.bext.codingHistory.length; |
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| 154 | bytes = bytes.concat( |
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| 155 | packString(this.bext.chunkId), |
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| 156 | pack(602 + this.bext.codingHistory.length, this.uInt32_), |
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| 157 | writeString(this.bext.description, 256), |
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| 158 | writeString(this.bext.originator, 32), |
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| 159 | writeString(this.bext.originatorReference, 32), |
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| 160 | writeString(this.bext.originationDate, 10), |
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| 161 | writeString(this.bext.originationTime, 8), |
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| 162 | pack(this.bext.timeReference[0], this.uInt32_), |
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| 163 | pack(this.bext.timeReference[1], this.uInt32_), |
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| 164 | pack(this.bext.version, this.uInt16_), |
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| 165 | writeString(this.bext.UMID, 64), |
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| 166 | pack(this.bext.loudnessValue, this.uInt16_), |
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| 167 | pack(this.bext.loudnessRange, this.uInt16_), |
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| 168 | pack(this.bext.maxTruePeakLevel, this.uInt16_), |
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| 169 | pack(this.bext.maxMomentaryLoudness, this.uInt16_), |
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| 170 | pack(this.bext.maxShortTermLoudness, this.uInt16_), |
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| 171 | writeString(this.bext.reserved, 180), |
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| 172 | writeString( |
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| 173 | this.bext.codingHistory, this.bext.codingHistory.length)); |
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| 174 | } |
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| 175 | return bytes; |
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| 176 | } |
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| 177 | |||
| 178 | /** |
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| 179 | * Make sure a 'bext' chunk is created if BWF data was created in a file. |
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| 180 | * @private |
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| 181 | */ |
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| 182 | enforceBext_() { |
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| 183 | for (let prop in this.bext) { |
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| 184 | if (this.bext.hasOwnProperty(prop)) { |
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| 185 | if (this.bext[prop] && prop != 'timeReference') { |
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| 186 | this.bext.chunkId = 'bext'; |
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| 187 | break; |
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| 188 | } |
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| 189 | } |
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| 190 | } |
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| 191 | if (this.bext.timeReference[0] || this.bext.timeReference[1]) { |
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| 192 | this.bext.chunkId = 'bext'; |
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| 193 | } |
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| 194 | } |
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| 195 | |||
| 196 | /** |
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| 197 | * Return the bytes of the 'ds64' chunk. |
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| 198 | * @return {!Array<number>} The 'ds64' chunk bytes. |
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| 199 | * @private |
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| 200 | */ |
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| 201 | getDs64Bytes_() { |
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| 202 | /** @type {!Array<number>} */ |
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| 203 | let bytes = []; |
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| 204 | if (this.ds64.chunkId) { |
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| 205 | bytes = bytes.concat( |
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| 206 | packString(this.ds64.chunkId), |
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| 207 | pack(this.ds64.chunkSize, this.uInt32_), |
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| 208 | pack(this.ds64.riffSizeHigh, this.uInt32_), |
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| 209 | pack(this.ds64.riffSizeLow, this.uInt32_), |
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| 210 | pack(this.ds64.dataSizeHigh, this.uInt32_), |
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| 211 | pack(this.ds64.dataSizeLow, this.uInt32_), |
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| 212 | pack(this.ds64.originationTime, this.uInt32_), |
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| 213 | pack(this.ds64.sampleCountHigh, this.uInt32_), |
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| 214 | pack(this.ds64.sampleCountLow, this.uInt32_)); |
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| 215 | } |
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| 216 | //if (this.ds64.tableLength) { |
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| 217 | // ds64Bytes = ds64Bytes.concat( |
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| 218 | // pack(this.ds64.tableLength, this.uInt32_), |
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| 219 | // this.ds64.table); |
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| 220 | //} |
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| 221 | return bytes; |
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| 222 | } |
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| 223 | |||
| 224 | /** |
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| 225 | * Return the bytes of the 'cue ' chunk. |
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| 226 | * @return {!Array<number>} The 'cue ' chunk bytes. |
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| 227 | * @private |
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| 228 | */ |
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| 229 | getCueBytes_() { |
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| 230 | /** @type {!Array<number>} */ |
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| 231 | let bytes = []; |
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| 232 | if (this.cue.chunkId) { |
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| 233 | /** @type {!Array<number>} */ |
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| 234 | let cuePointsBytes = this.getCuePointsBytes_(); |
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| 235 | bytes = bytes.concat( |
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| 236 | packString(this.cue.chunkId), |
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| 237 | pack(cuePointsBytes.length + 4, this.uInt32_), |
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| 238 | pack(this.cue.dwCuePoints, this.uInt32_), |
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| 239 | cuePointsBytes); |
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| 240 | } |
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| 241 | return bytes; |
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| 242 | } |
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| 243 | |||
| 244 | /** |
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| 245 | * Return the bytes of the 'cue ' points. |
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| 246 | * @return {!Array<number>} The 'cue ' points as an array of bytes. |
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| 247 | * @private |
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| 248 | */ |
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| 249 | getCuePointsBytes_() { |
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| 250 | /** @type {!Array<number>} */ |
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| 251 | let points = []; |
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| 252 | for (let i=0; i<this.cue.dwCuePoints; i++) { |
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| 253 | points = points.concat( |
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| 254 | pack(this.cue.points[i].dwName, this.uInt32_), |
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| 255 | pack(this.cue.points[i].dwPosition, this.uInt32_), |
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| 256 | packString(this.cue.points[i].fccChunk), |
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| 257 | pack(this.cue.points[i].dwChunkStart, this.uInt32_), |
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| 258 | pack(this.cue.points[i].dwBlockStart, this.uInt32_), |
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| 259 | pack(this.cue.points[i].dwSampleOffset, this.uInt32_)); |
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| 260 | } |
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| 261 | return points; |
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| 262 | } |
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| 263 | |||
| 264 | /** |
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| 265 | * Return the bytes of the 'smpl' chunk. |
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| 266 | * @return {!Array<number>} The 'smpl' chunk bytes. |
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| 267 | * @private |
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| 268 | */ |
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| 269 | getSmplBytes_() { |
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| 270 | /** @type {!Array<number>} */ |
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| 271 | let bytes = []; |
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| 272 | if (this.smpl.chunkId) { |
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| 273 | /** @type {!Array<number>} */ |
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| 274 | let smplLoopsBytes = this.getSmplLoopsBytes_(); |
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| 275 | bytes = bytes.concat( |
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| 276 | packString(this.smpl.chunkId), |
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| 277 | pack(smplLoopsBytes.length + 36, this.uInt32_), |
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| 278 | pack(this.smpl.dwManufacturer, this.uInt32_), |
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| 279 | pack(this.smpl.dwProduct, this.uInt32_), |
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| 280 | pack(this.smpl.dwSamplePeriod, this.uInt32_), |
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| 281 | pack(this.smpl.dwMIDIUnityNote, this.uInt32_), |
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| 498 |
