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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 create wav file headers. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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/** |
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* Audio formats. |
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* Formats not listed here will be set to 65534, |
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* the code for WAVE_FORMAT_EXTENSIBLE |
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* @enum {number} |
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* @private |
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*/ |
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export const AUDIO_FORMATS = { |
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'4': 17, |
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'8': 1, |
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'8a': 6, |
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'8m': 7, |
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'16': 1, |
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'24': 1, |
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'32': 1, |
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'32f': 3, |
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'64': 3 |
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}; |
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/** |
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* Return the header for a wav file. |
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* @param {string} bitDepthCode The audio bit depth |
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* @param {number} numChannels The number of channels |
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* @param {number} sampleRate The sample rate. |
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* @param {number} numBytes The number of bytes each sample use. |
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* @param {number} samplesLength The length of the samples in bytes. |
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* @param {!Object} options The extra options, like container defintion. |
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* @private |
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*/ |
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export function wavHeader(bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) { |
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let header = {}; |
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if (bitDepthCode == '4') { |
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header = createADPCMHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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} else if (bitDepthCode == '8a' || bitDepthCode == '8m') { |
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header = createALawMulawHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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} else if(Object.keys(AUDIO_FORMATS).indexOf(bitDepthCode) == -1 || |
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numChannels > 2) { |
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header = createExtensibleHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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} else { |
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header = createPCMHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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} |
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return header; |
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} |
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/** |
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* Create the header of a linear PCM wave file. |
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* @param {string} bitDepthCode The audio bit depth |
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* @param {number} numChannels The number of channels |
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* @param {number} sampleRate The sample rate. |
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* @param {number} numBytes The number of bytes each sample use. |
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* @param {number} samplesLength The length of the samples in bytes. |
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* @param {!Object} options The extra options, like container defintion. |
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* @private |
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*/ |
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function createPCMHeader_(bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) { |
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return { |
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container: options.container, |
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chunkSize: 36 + samplesLength, |
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format: 'WAVE', |
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fmt: { |
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chunkId: 'fmt ', |
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chunkSize: 16, |
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audioFormat: AUDIO_FORMATS[bitDepthCode] ? AUDIO_FORMATS[bitDepthCode] : 65534, |
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numChannels: numChannels, |
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sampleRate: sampleRate, |
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byteRate: (numChannels * numBytes) * sampleRate, |
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blockAlign: numChannels * numBytes, |
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bitsPerSample: parseInt(bitDepthCode, 10), |
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cbSize: 0, |
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validBitsPerSample: 0, |
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dwChannelMask: 0, |
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subformat: [] |
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} |
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}; |
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} |
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/** |
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* Create the header of a ADPCM wave file. |
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* @param {string} bitDepthCode The audio bit depth |
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* @param {number} numChannels The number of channels |
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* @param {number} sampleRate The sample rate. |
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* @param {number} numBytes The number of bytes each sample use. |
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* @param {number} samplesLength The length of the samples in bytes. |
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* @param {!Object} options The extra options, like container defintion. |
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* @private |
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*/ |
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function createADPCMHeader_(bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) { |
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let header = createPCMHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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header.chunkSize = 40 + samplesLength; |
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header.fmt.chunkSize = 20; |
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header.fmt.byteRate = 4055; |
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header.fmt.blockAlign = 256; |
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header.fmt.bitsPerSample = 4; |
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header.fmt.cbSize = 2; |
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header.fmt.validBitsPerSample = 505; |
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header.fact = { |
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chunkId: 'fact', |
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chunkSize: 4, |
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dwSampleLength: samplesLength * 2 |
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}; |
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return header; |
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} |
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/** |
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* Create the header of WAVE_FORMAT_EXTENSIBLE file. |
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* @param {string} bitDepthCode The audio bit depth |
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* @param {number} numChannels The number of channels |
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* @param {number} sampleRate The sample rate. |
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* @param {number} numBytes The number of bytes each sample use. |
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* @param {number} samplesLength The length of the samples in bytes. |
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* @param {!Object} options The extra options, like container defintion. |
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* @private |
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*/ |
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function createExtensibleHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) { |
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let header = createPCMHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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header.chunkSize = 36 + 24 + samplesLength; |
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header.fmt.chunkSize = 40; |
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header.fmt.bitsPerSample = ((parseInt(bitDepthCode, 10) - 1) | 7) + 1; |
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header.fmt.cbSize = 22; |
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header.fmt.validBitsPerSample = parseInt(bitDepthCode, 10); |
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header.fmt.dwChannelMask = getDwChannelMask_(numChannels); |
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// subformat 128-bit GUID as 4 32-bit values |
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// only supports uncompressed integer PCM samples |
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header.fmt.subformat = [1, 1048576, 2852126848, 1905997824]; |
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return header; |
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} |
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/** |
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* Create the header of mu-Law and A-Law wave files. |
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* @param {string} bitDepthCode The audio bit depth |
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* @param {number} numChannels The number of channels |
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* @param {number} sampleRate The sample rate. |
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* @param {number} numBytes The number of bytes each sample use. |
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* @param {number} samplesLength The length of the samples in bytes. |
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* @param {!Object} options The extra options, like container defintion. |
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* @private |
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*/ |
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function createALawMulawHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) { |
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let header = createPCMHeader_( |
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bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options); |
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header.chunkSize = 40 + samplesLength; |
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header.fmt.chunkSize = 20; |
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header.fmt.cbSize = 2; |
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header.fmt.validBitsPerSample = 8; |
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header.fact = { |
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chunkId: 'fact', |
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chunkSize: 4, |
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dwSampleLength: samplesLength |
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}; |
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return header; |
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} |
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/** |
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* Get the value for dwChannelMask according to the number of channels. |
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* @return {number} the dwChannelMask value. |
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* @private |
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*/ |
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function getDwChannelMask_(numChannels) { |
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/** @type {number} */ |
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let dwChannelMask = 0; |
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// mono = FC |
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if (numChannels === 1) { |
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dwChannelMask = 0x4; |
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// stereo = FL, FR |
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} else if (numChannels === 2) { |
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dwChannelMask = 0x3; |
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// quad = FL, FR, BL, BR |
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} else if (numChannels === 4) { |
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dwChannelMask = 0x33; |
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// 5.1 = FL, FR, FC, LF, BL, BR |
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} else if (numChannels === 6) { |
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dwChannelMask = 0x3F; |
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// 7.1 = FL, FR, FC, LF, BL, BR, SL, SR |
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} else if (numChannels === 8) { |
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dwChannelMask = 0x63F; |
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} |
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return dwChannelMask; |
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} |
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