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/* |
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* Copyright (c) 2017-2019 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 The interleave function. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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/** |
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* Interleave de-interleaved samples. |
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* @param {!(Array|TypedArray)} samples The samples. |
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* @return {!(Array|TypedArray)} |
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*/ |
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export function interleave(samples) { |
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/** @type {!(Array|TypedArray)} */ |
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let finalSamples = []; |
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if (samples.length > 0) { |
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if (samples[0].constructor !== Number) { |
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finalSamples = new Float64Array(samples[0].length * samples.length); |
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for (let i = 0, len = samples[0].length, x = 0; i < len; i++) { |
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for (let j = 0, subLen = samples.length; j < subLen; j++, x++) { |
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finalSamples[x] = samples[j][i]; |
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} |
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} |
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} else { |
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finalSamples = samples; |
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} |
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} |
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return finalSamples; |
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} |
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/** |
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* De-interleave samples into multiple channels. |
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* @param {!(Array|TypedArray)} samples The samples. |
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* @param {number} numChannels The number of channels to split the samples. |
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* @param {Function} [OutputObject=Float64Array] The type of object to |
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* write the de-interleaved samples. |
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* @return {!(Array|TypedArray)} |
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*/ |
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export function deInterleave(samples, numChannels, OutputObject=Float64Array) { |
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/** @type {!(Array|TypedArray)} */ |
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let finalSamples = []; |
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for (let i = 0; i < numChannels; i++) { |
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finalSamples[i] = new OutputObject(samples.length / numChannels); |
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} |
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for (let i = 0; i < numChannels; i++) { |
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for (let j = i, s = 0; j < samples.length; j+= numChannels, s++) { |
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finalSamples[i][s] = samples[j]; |
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} |
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} |
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return finalSamples; |
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} |
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rochars /
wavefile
