index.js ➔ validateBitDepths_ - Code Metrics - Inspection of "run tests against minified dist" - rochars/bitdepth - Measure and Improve Code Quality continuously with Scrutinizer

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by Rafael S.

created 2018-04-26 22:25 UTC

index.js ➔ validateBitDepths_ A

↳ Parent: index.js

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Conditions	3
Paths	1

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Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
nc	1
nop	2
dl	0
loc	8
rs	9.4285
c	0
b	0
f	0

/*!
 * bitdepth
 * Change the bit depth of samples to and from 8, 16, 24, 32 & 64-bit.
 * Copyright (c) 2017 Rafael da Silva Rocha.
 * https://github.com/rochars/bitdepth
 *
 */

const f64f32 = new Float32Array(1);

/**
 * Max number of different values for each bit depth.
 * @enum {number}
 */
const MAX_VALUES = {
    "8": 256,
    "16": 65536,
    "24": 16777216,
    "32": 4294967296,
    "32f": 1,
    "64": 1
};

/**
 * Functions to change the bit depth of a sample.
 */
const BitDepthFunctions = {

    /**
     * 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}
     */
    "intToInt": function(sample, args) {
        if (sample > 0) {
            sample = parseInt(
                (sample / args["oldPositive"]) * args["newPositive"], 10);
        } else {
            sample = parseInt(
                (sample / args["oldNegative"]) * args["newNegative"], 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}
     */
    "floatToInt": function(sample, args) {
        return sample > 0 ?
            sample * args["newPositive"] : sample * args["newNegative"];
    },

    /**
     * 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}
     */
    "intToFloat": function(sample, args) {
        return sample > 0 ?
            sample / args["oldPositive"] : sample / args["oldNegative"];
    },

    /**
     * Change the bit depth from float to float.
     * @param {number} sample The sample.
     * @param {Object} args Data about the original and target bit depths.
     * @return {number}
     */
    "floatToFloat": function(sample, args) {
        if (args["original"] == "64" && args["target"] == "32f") {
            f64f32[0] = sample;
            sample = f64f32[0];
        }
        return sample;
    }
};

/**
 * 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} originalBitDepth The original bit depth of the data.
 *      One of "8", "16", "24", "32", "32f", "64"
 * @param {string} targetBitDepth The new bit depth of the data.
 *      One of "8", "16", "24", "32", "32f", "64"
 */
function toBitDepth(samples, originalBitDepth, targetBitDepth) {
    validateBitDepths_(originalBitDepth, targetBitDepth);
    let toFunction = getBitDepthFunction_(originalBitDepth, targetBitDepth);
    let len = samples.length;
    for (let i=0; i<len; i++) {        
        samples[i] = sign8Bit_(samples[i], originalBitDepth);
        samples[i] = toFunction(
                samples[i],
                {
                    "oldNegative": MAX_VALUES[originalBitDepth] / 2,
                    "newNegative": MAX_VALUES[targetBitDepth] / 2,
                    "oldPositive": MAX_VALUES[originalBitDepth] / 2 - 1,
                    "newPositive": MAX_VALUES[targetBitDepth] / 2 - 1,
                    "original": originalBitDepth,
                    "target": targetBitDepth
                }
            );
        samples[i] = unsign8Bit_(samples[i], targetBitDepth);
    }
}

/**
 * Get the function to change the bit depth of a sample.
 * @param {string} originalBitDepth The original bit depth of the data.
 *      One of "8", "16", "24", "32", "32f", "64"
 * @param {string} targetBitDepth The new bit depth of the data.
 *      One of "8", "16", "24", "32", "32f", "64"
 * @return {Function}
 */
function getBitDepthFunction_(originalBitDepth, targetBitDepth) {
    let prefix;
    let suffix;
    if (["32f", "64"].includes(originalBitDepth)) {
        prefix = "float";
    } else {
        prefix = "int";
    }
    if (["32f", "64"].includes(targetBitDepth)) {
        suffix = "Float";
    } else {
        suffix = "Int";
    }
    return BitDepthFunctions[prefix + "To" + suffix];
}

/**
 * Sign unsigned 8-bit data.
 * @param {number} sample The sample.
 * @param {string} originalBitDepth The original bit depth of the data.
 *      One of "8", "16", "24", "32", "32f", "64"
 * @return {number}
 */
function sign8Bit_(sample, originalBitDepth) {
    if (originalBitDepth == "8") {
        sample -= 128;
    }
    return sample;
}

/**
 * Unsign signed 8-bit data.
 * @param {number} sample The sample.
 * @param {string} targetBitDepth The target bit depth of the data.
 *      One of "8", "16", "24", "32", "32f", "64"
 * @return {number}
 */
function unsign8Bit_(sample, targetBitDepth) {
    if (targetBitDepth == "8") {
        sample += 128;
    }
    return sample;
}

/**
 * Validate the bit depth.
 * @param {string} originalBitDepth The original bit depth.
 *     Should be one of "8", "16", "24", "32", "32f", "64".
 * @param {string} targetBitDepth The target bit depth.
 *     Should be one of "8", "16", "24", "32", "32f", "64".
 * @throws {Error} If any argument does not meet the criteria.
 * @return {boolean}
 */
function validateBitDepths_(originalBitDepth, targetBitDepth) {
    let validBitDepths = ["8", "16", "24", "32", "32f", "64"];
    if (validBitDepths.indexOf(originalBitDepth) == -1 ||
        validBitDepths.indexOf(targetBitDepth) == -1) {
        throw new Error("Invalid bit depth.");
    }
    return true;
}

module.exports.toBitDepth = toBitDepth;
module.exports.BitDepthMaxValues = MAX_VALUES;


1			/*!
2			* bitdepth
3			* Change the bit depth of samples to and from 8, 16, 24, 32 & 64-bit.
4			* Copyright (c) 2017 Rafael da Silva Rocha.
5			* https://github.com/rochars/bitdepth
6			*
7			*/
8
9			const f64f32 = new Float32Array(1);
10
11			/**
12			* Max number of different values for each bit depth.
13			* @enum {number}
14			*/
15			const MAX_VALUES = {
16			"8": 256,
17			"16": 65536,
18			"24": 16777216,
19			"32": 4294967296,
20			"32f": 1,
21			"64": 1
22			};
23
24			/**
25			* Functions to change the bit depth of a sample.
26			*/
27			const BitDepthFunctions = {
28
29			/**
30			* Change the bit depth from int to int.
31			* @param {number} sample The sample.
32			* @param {Object} args Data about the original and target bit depths.
33			* @return {number}
34			*/
35			"intToInt": function(sample, args) {
36			if (sample > 0) {
37			sample = parseInt(
38			(sample / args["oldPositive"]) * args["newPositive"], 10);
39			} else {
40			sample = parseInt(
41			(sample / args["oldNegative"]) * args["newNegative"], 10);
42			}
43			return sample;
44			},
45
46			/**
47			* Change the bit depth from float to int.
48			* @param {number} sample The sample.
49			* @param {Object} args Data about the original and target bit depths.
50			* @return {number}
51			*/
52			"floatToInt": function(sample, args) {
53			return sample > 0 ?
54			sample * args["newPositive"] : sample * args["newNegative"];
55			},
56
57			/**
58			* Change the bit depth from int to float.
59			* @param {number} sample The sample.
60			* @param {Object} args Data about the original and target bit depths.
61			* @return {number}
62			*/
63			"intToFloat": function(sample, args) {
64			return sample > 0 ?
65			sample / args["oldPositive"] : sample / args["oldNegative"];
66			},
67
68			/**
69			* Change the bit depth from float to float.
70			* @param {number} sample The sample.
71			* @param {Object} args Data about the original and target bit depths.
72			* @return {number}
73			*/
74			"floatToFloat": function(sample, args) {
75			if (args["original"] == "64" && args["target"] == "32f") {
76			f64f32[0] = sample;
77			sample = f64f32[0];
78			}
79			return sample;
80			}
81			};
82
83			/**
84			* Change the bit depth of the data in a array.
85			* The input array is modified in-place.
86			* @param {!Array<number>} samples The samples.
87			* @param {string} originalBitDepth The original bit depth of the data.
88			* One of "8", "16", "24", "32", "32f", "64"
89			* @param {string} targetBitDepth The new bit depth of the data.
90			* One of "8", "16", "24", "32", "32f", "64"
91			*/
92			function toBitDepth(samples, originalBitDepth, targetBitDepth) {
93			validateBitDepths_(originalBitDepth, targetBitDepth);
94			let toFunction = getBitDepthFunction_(originalBitDepth, targetBitDepth);
95			let len = samples.length;
96			for (let i=0; i<len; i++) {
97			samples[i] = sign8Bit_(samples[i], originalBitDepth);
98			samples[i] = toFunction(
99			samples[i],
100			{
101			"oldNegative": MAX_VALUES[originalBitDepth] / 2,
102			"newNegative": MAX_VALUES[targetBitDepth] / 2,
103			"oldPositive": MAX_VALUES[originalBitDepth] / 2 - 1,
104			"newPositive": MAX_VALUES[targetBitDepth] / 2 - 1,
105			"original": originalBitDepth,
106			"target": targetBitDepth
107			}
108			);
109			samples[i] = unsign8Bit_(samples[i], targetBitDepth);
110			}
111			}
112
113			/**
114			* Get the function to change the bit depth of a sample.
115			* @param {string} originalBitDepth The original bit depth of the data.
116			* One of "8", "16", "24", "32", "32f", "64"
117			* @param {string} targetBitDepth The new bit depth of the data.
118			* One of "8", "16", "24", "32", "32f", "64"
119			* @return {Function}
120			*/
121			function getBitDepthFunction_(originalBitDepth, targetBitDepth) {
122			let prefix;
123			let suffix;
124			if (["32f", "64"].includes(originalBitDepth)) {
125			prefix = "float";
126			} else {
127			prefix = "int";
128			}
129			if (["32f", "64"].includes(targetBitDepth)) {
130			suffix = "Float";
131			} else {
132			suffix = "Int";
133			}
134			return BitDepthFunctions[prefix + "To" + suffix];
135			}
136
137			/**
138			* Sign unsigned 8-bit data.
139			* @param {number} sample The sample.
140			* @param {string} originalBitDepth The original bit depth of the data.
141			* One of "8", "16", "24", "32", "32f", "64"
142			* @return {number}
143			*/
144			function sign8Bit_(sample, originalBitDepth) {
145			if (originalBitDepth == "8") {
146			sample -= 128;
147			}
148			return sample;
149			}
150
151			/**
152			* Unsign signed 8-bit data.
153			* @param {number} sample The sample.
154			* @param {string} targetBitDepth The target bit depth of the data.
155			* One of "8", "16", "24", "32", "32f", "64"
156			* @return {number}
157			*/
158			function unsign8Bit_(sample, targetBitDepth) {
159			if (targetBitDepth == "8") {
160			sample += 128;
161			}
162			return sample;
163			}
164
165			/**
166			* Validate the bit depth.
167			* @param {string} originalBitDepth The original bit depth.
168			* Should be one of "8", "16", "24", "32", "32f", "64".
169			* @param {string} targetBitDepth The target bit depth.
170			* Should be one of "8", "16", "24", "32", "32f", "64".
171			* @throws {Error} If any argument does not meet the criteria.
172			* @return {boolean}
173			*/
174			function validateBitDepths_(originalBitDepth, targetBitDepth) {
175			let validBitDepths = ["8", "16", "24", "32", "32f", "64"];
176			if (validBitDepths.indexOf(originalBitDepth) == -1 \|\|
177			validBitDepths.indexOf(targetBitDepth) == -1) {
178			throw new Error("Invalid bit depth.");
179			}
180			return true;
181			}
182
183			module.exports.toBitDepth = toBitDepth;
184			module.exports.BitDepthMaxValues = MAX_VALUES;
185

rochars / bitdepth

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