T_CONST ➔ bitdepth - Code Metrics - Inspection of "Refactor getBitDepthFunction_()" - rochars/bitdepth - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — v4.x (8cfd5c)

by Rafael S.

created 2018-06-17 08:42 UTC

T_CONST ➔ bitdepth B

↳ Parent: Project

Complexity

Conditions	6
Paths	24

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	6
c	1
b	0
f	0
nc	24
nop	4
dl	0
loc	1
rs	8.8571

/*
 * bitdepth: Change the resolution of samples to and from any bit depth.
 * https://github.com/rochars/bitdepth
 *
 * Copyright (c) 2017-2018 Rafael da Silva Rocha.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

/**
 * @fileoverview The bitdepth() function and private helper functions.
 */

/** @private */
const f64f32_ = new Float32Array(1);

/**
 * Change the bit depth of the data in a array.
 * The input array is modified in-place.
 * @param {!Array<number>} samples The samples.
 * @param {string} original The original bit depth of the data.
 *      One of "8" ... "53", "32f", "64"
 * @param {string} target The desired bit depth for the data.
 *      One of "8" ... "53", "32f", "64"
 * @param {Array<number>=} outputArray An optional array to write
        converted samples to. Useful for writing to typed arrays.
 */
function bitdepth(samples, original, target, outputArray) {
  validateBitDepth_(original);
  validateBitDepth_(target);
  outputArray = outputArray || samples;
  /** @type {!Function} */
  let toFunction = getBitDepthFunction_(original, target);
  /** @type {!Object} */
  let options = {
    oldMin: Math.pow(2, parseInt(original, 10)) / 2,
    newMin: Math.pow(2, parseInt(target, 10)) / 2,
    oldMax: (Math.pow(2, parseInt(original, 10)) / 2) - 1,
    newMax: (Math.pow(2, parseInt(target, 10)) / 2) - 1,
  };
  /** @type {number} */
  const len = samples.length;
  // sign the samples if original is 8-bit
  if (original == "8") {
    for (let i=0; i<len; i++) {
      outputArray[i] = samples[i] -= 128;
    }
  }
  // change the resolution of the samples
  for (let i=0; i<len; i++) {        
    outputArray[i] = toFunction(samples[i], options);
  }
  // unsign the samples if target is 8-bit
  if (target == "8") {
    for (let i=0; i<len; i++) {
      outputArray[i] = outputArray[i] += 128;
    }
  }
}

/**
 * Change the bit depth from int to int.
 * @param {number} sample The sample.
 * @param {!Object} args Data about the original and target bit depths.
 * @return {number}
 * @private
 */
function intToInt_(sample, args) {
  if (sample > 0) {
    sample = parseInt((sample / args.oldMax) * args.newMax, 10);
  } else {
    sample = parseInt((sample / args.oldMin) * args.newMin, 10);
  }
  return sample;
}

/**
 * Change the bit depth from float to int.
 * @param {number} sample The sample.
 * @param {!Object} args Data about the original and target bit depths.
 * @return {number}
 * @private
 */
function floatToInt_(sample, args) {
  return parseInt(
    sample > 0 ? sample * args.newMax : sample * args.newMin, 10);
}

/**
 * Change the bit depth from int to float.
 * @param {number} sample The sample.
 * @param {!Object} args Data about the original and target bit depths.
 * @return {number}
 * @private
 */
function intToFloat_(sample, args) {
  return sample > 0 ? sample / args.oldMax : sample / args.oldMin;
}

/**
 * Change the bit depth from float to float.
 * @param {number} sample The sample.
 * @return {number}
 * @private
 */
function floatToFloat_(sample) {
  f64f32_[0] = sample;
  return f64f32_[0];
}

/**
 * Return the function to change the bit depth of a sample.
 * @param {string} original The original bit depth of the data.
 *      One of "8" ... "53", "32f", "64"
 * @param {string} target The new bit depth of the data.
 *      One of "8" ... "53", "32f", "64"
 * @return {!Function}
 * @private
 */
function getBitDepthFunction_(original, target) {
  /** @type {!Function} */
  let func = function(x) {return x;};
  if (original != target) {
    if (["32f", "64"].includes(original)) {
      if (["32f", "64"].includes(target)) {
        func = floatToFloat_;
      } else {
        func = floatToInt_;
      }
    } else {
      if (["32f", "64"].includes(target)) {
        func = intToFloat_;
      } else {
        func = intToInt_;
      }
    }
  }
  return func;
}

/**
 * Validate the bit depth.
 * @param {string} bitDepth The original bit depth.
 *     Should be one of "8" ... "53", "32f" or "64".
 * @throws {Error} If any argument does not meet the criteria.
 * @private
 */
function validateBitDepth_(bitDepth) {
  if ((bitDepth != "32f" && bitDepth != "64") &&
      (parseInt(bitDepth, 10) < "8" || parseInt(bitDepth, 10) > "53")) {
    throw new Error("Invalid bit depth.");
  }
}

module.exports = bitdepth;


1			/*
2			* bitdepth: Change the resolution of samples to and from any bit depth.
3			* https://github.com/rochars/bitdepth
4			*
5			* Copyright (c) 2017-2018 Rafael da Silva Rocha.
6			*
7			* Permission is hereby granted, free of charge, to any person obtaining
8			* a copy of this software and associated documentation files (the
9			* "Software"), to deal in the Software without restriction, including
10			* without limitation the rights to use, copy, modify, merge, publish,
11			* distribute, sublicense, and/or sell copies of the Software, and to
12			* permit persons to whom the Software is furnished to do so, subject to
13			* the following conditions:
14			*
15			* The above copyright notice and this permission notice shall be
16			* included in all copies or substantial portions of the Software.
17			*
18			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19			* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21			* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22			* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23			* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24			* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25			*
26			*/
27
28			/**
29			* @fileoverview The bitdepth() function and private helper functions.
30			*/
31
32			/** @private */
33			const f64f32_ = new Float32Array(1);
34
35			/**
36			* Change the bit depth of the data in a array.
37			* The input array is modified in-place.
38			* @param {!Array<number>} samples The samples.
39			* @param {string} original The original bit depth of the data.
40			* One of "8" ... "53", "32f", "64"
41			* @param {string} target The desired bit depth for the data.
42			* One of "8" ... "53", "32f", "64"
43			* @param {Array<number>=} outputArray An optional array to write
44			converted samples to. Useful for writing to typed arrays.
45			*/
46			function bitdepth(samples, original, target, outputArray) {
47			validateBitDepth_(original);
48			validateBitDepth_(target);
49			outputArray = outputArray \|\| samples;
50			/** @type {!Function} */
51			let toFunction = getBitDepthFunction_(original, target);
52			/** @type {!Object} */
53			let options = {
54			oldMin: Math.pow(2, parseInt(original, 10)) / 2,
55			newMin: Math.pow(2, parseInt(target, 10)) / 2,
56			oldMax: (Math.pow(2, parseInt(original, 10)) / 2) - 1,
57			newMax: (Math.pow(2, parseInt(target, 10)) / 2) - 1,
58			};
59			/** @type {number} */
60			const len = samples.length;
61			// sign the samples if original is 8-bit
62			if (original == "8") {
63			for (let i=0; i<len; i++) {
64			outputArray[i] = samples[i] -= 128;
65			}
66			}
67			// change the resolution of the samples
68			for (let i=0; i<len; i++) {
69			outputArray[i] = toFunction(samples[i], options);
70			}
71			// unsign the samples if target is 8-bit
72			if (target == "8") {
73			for (let i=0; i<len; i++) {
74			outputArray[i] = outputArray[i] += 128;
75			}
76			}
77			}
78
79			/**
80			* Change the bit depth from int to int.
81			* @param {number} sample The sample.
82			* @param {!Object} args Data about the original and target bit depths.
83			* @return {number}
84			* @private
85			*/
86			function intToInt_(sample, args) {
87			if (sample > 0) {
88			sample = parseInt((sample / args.oldMax) * args.newMax, 10);
89			} else {
90			sample = parseInt((sample / args.oldMin) * args.newMin, 10);
91			}
92			return sample;
93			}
94
95			/**
96			* Change the bit depth from float to int.
97			* @param {number} sample The sample.
98			* @param {!Object} args Data about the original and target bit depths.
99			* @return {number}
100			* @private
101			*/
102			function floatToInt_(sample, args) {
103			return parseInt(
104			sample > 0 ? sample * args.newMax : sample * args.newMin, 10);
105			}
106
107			/**
108			* Change the bit depth from int to float.
109			* @param {number} sample The sample.
110			* @param {!Object} args Data about the original and target bit depths.
111			* @return {number}
112			* @private
113			*/
114			function intToFloat_(sample, args) {
115			return sample > 0 ? sample / args.oldMax : sample / args.oldMin;
116			}
117
118			/**
119			* Change the bit depth from float to float.
120			* @param {number} sample The sample.
121			* @return {number}
122			* @private
123			*/
124			function floatToFloat_(sample) {
125			f64f32_[0] = sample;
126			return f64f32_[0];
127			}
128
129			/**
130			* Return the function to change the bit depth of a sample.
131			* @param {string} original The original bit depth of the data.
132			* One of "8" ... "53", "32f", "64"
133			* @param {string} target The new bit depth of the data.
134			* One of "8" ... "53", "32f", "64"
135			* @return {!Function}
136			* @private
137			*/
138			function getBitDepthFunction_(original, target) {
139			/** @type {!Function} */
140			let func = function(x) {return x;};
141			if (original != target) {
142			if (["32f", "64"].includes(original)) {
143			if (["32f", "64"].includes(target)) {
144			func = floatToFloat_;
145			} else {
146			func = floatToInt_;
147			}
148			} else {
149			if (["32f", "64"].includes(target)) {
150			func = intToFloat_;
151			} else {
152			func = intToInt_;
153			}
154			}
155			}
156			return func;
157			}
158
159			/**
160			* Validate the bit depth.
161			* @param {string} bitDepth The original bit depth.
162			* Should be one of "8" ... "53", "32f" or "64".
163			* @throws {Error} If any argument does not meet the criteria.
164			* @private
165			*/
166			function validateBitDepth_(bitDepth) {
167			if ((bitDepth != "32f" && bitDepth != "64") &&
168			(parseInt(bitDepth, 10) < "8" \|\| parseInt(bitDepth, 10) > "53")) {
169			throw new Error("Invalid bit depth.");
170			}
171			}
172
173			module.exports = bitdepth;
174

rochars / bitdepth

Branch — v4.x (8cfd5c)

T_CONST ➔ bitdepth B

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