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/* |
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* Copyright (c) 2018 Rafael da Silva Rocha. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be |
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* included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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/** |
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* @fileoverview A tool to validate wav file headers. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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import WAV_AUDIO_FORMATS from './wav-audio-formats.js'; |
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/** |
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* Validate the header of the file. |
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* @throws {Error} If any property of the object appears invalid. |
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* @private |
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*/ |
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export default function validateWavHeader_(header) { |
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validateBitDepth_(header); |
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validateNumChannels_(header); |
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validateSampleRate_(header); |
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} |
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/** |
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* Validate the bit depth. |
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* @return {boolean} True is the bit depth is valid. |
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* @throws {Error} If bit depth is invalid. |
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* @private |
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*/ |
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function validateBitDepth_(header) { |
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if (!WAV_AUDIO_FORMATS[header.bitDepth]) { |
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if (parseInt(header.bitDepth, 10) > 8 && |
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parseInt(header.bitDepth, 10) < 54) { |
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return true; |
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} |
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throw new Error('Invalid bit depth.'); |
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} |
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return true; |
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} |
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/** |
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* Validate the number of channels. |
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* @return {boolean} True is the number of channels is valid. |
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* @throws {Error} If the number of channels is invalid. |
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* @private |
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*/ |
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function validateNumChannels_(header) { |
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/** @type {number} */ |
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let blockAlign = header.fmt.numChannels * header.fmt.bitsPerSample / 8; |
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if (header.fmt.numChannels < 1 || blockAlign > 65535) { |
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throw new Error('Invalid number of channels.'); |
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} |
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return true; |
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} |
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/** |
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* Validate the sample rate value. |
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* @return {boolean} True is the sample rate is valid. |
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* @throws {Error} If the sample rate is invalid. |
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* @private |
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*/ |
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function validateSampleRate_(header) { |
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/** @type {number} */ |
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let byteRate = header.fmt.numChannels * |
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(header.fmt.bitsPerSample / 8) * header.fmt.sampleRate; |
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if (header.fmt.sampleRate < 1 || byteRate > 4294967295) { |
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throw new Error('Invalid sample rate.'); |
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} |
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return true; |
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} |
rochars /
wavefile
