index.js ➔ sign8Bit - Code Metrics - Inspection of "fix 64-bit float to 32-bit float" - rochars/bitdepth - Measure and Improve Code Quality continuously with Scrutinizer

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by Rafael S.

created 2017-11-29 22:20 UTC

index.js ➔ sign8Bit A

↳ Parent: index.js

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
nc	2
nop	2
dl	0
loc	6
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 BitDepthMaxValues = {
    "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(sample, args) {
        if (sample > 0) {
            sample = parseInt((sample / (args.old - 1)) * args.new - 1, 10);
        } else {
            sample = parseInt((sample / args.old) * args.new, 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(sample, args) {
        if (sample > 0) {
            sample = sample * (args.new - 1);
        } else {
            sample = sample * args.new;
        }
        return sample;
    },

    /**
     * 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(sample, args) {
        if (sample > 0) {
            sample = sample / (args.old - 1);
        } else {
            sample = sample / args.old;
        }
        return sample;
    },

    /**
     * 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(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 sample 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],
                {
                    "old": BitDepthMaxValues[originalBitDepth] / 2,
                    "new": BitDepthMaxValues[targetBitDepth] / 2,
                    "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 = BitDepthMaxValues;


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 BitDepthMaxValues = {
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(sample, args) {
36			if (sample > 0) {
37			sample = parseInt((sample / (args.old - 1)) * args.new - 1, 10);
38			} else {
39			sample = parseInt((sample / args.old) * args.new, 10);
40			}
41			return sample;
42			},
43
44			/**
45			* Change the bit depth from float to int.
46			* @param {number} sample The sample.
47			* @param {Object} args Data about the original and target bit depths.
48			* @return {number}
49			*/
50			floatToInt(sample, args) {
51			if (sample > 0) {
52			sample = sample * (args.new - 1);
53			} else {
54			sample = sample * args.new;
55			}
56			return sample;
57			},
58
59			/**
60			* Change the bit depth from int to float.
61			* @param {number} sample The sample.
62			* @param {Object} args Data about the original and target bit depths.
63			* @return {number}
64			*/
65			intToFloat(sample, args) {
66			if (sample > 0) {
67			sample = sample / (args.old - 1);
68			} else {
69			sample = sample / args.old;
70			}
71			return sample;
72			},
73
74			/**
75			* Change the bit depth from float to float.
76			* @param {number} sample The sample.
77			* @param {Object} args Data about the original and target bit depths.
78			* @return {number}
79			*/
80			floatToFloat(sample, args) {
81			if (args.original == "64" && args.target == "32f") {
82			f64f32[0] = sample;
83			sample = f64f32[0];
84			}
85			return sample;
86			}
87			};
88
89			/**
90			* Change the bit depth of the data in a sample array.
91			* The input array is modified in-place.
92			* @param {!Array<number>} samples The samples.
93			* @param {string} originalBitDepth The original bit depth of the data.
94			* One of "8", "16", "24", "32", "32f", "64"
95			* @param {string} targetBitDepth The new bit depth of the data.
96			* One of "8", "16", "24", "32", "32f", "64"
97			*/
98			function toBitDepth(samples, originalBitDepth, targetBitDepth) {
99			validateBitDepths(originalBitDepth, targetBitDepth);
100			let toFunction = getBitDepthFunction(originalBitDepth, targetBitDepth);
101			let len = samples.length;
102			for (let i=0; i<len; i++) {
103			samples[i] = sign8Bit(samples[i], originalBitDepth);
104			samples[i] = toFunction(
105			samples[i],
106			{
107			"old": BitDepthMaxValues[originalBitDepth] / 2,
108			"new": BitDepthMaxValues[targetBitDepth] / 2,
109			"original": originalBitDepth,
110			"target": targetBitDepth
111			}
112			);
113			samples[i] = unsign8Bit(samples[i], targetBitDepth);
114			}
115			}
116
117			/**
118			* Get the function to change the bit depth of a sample.
119			* @param {string} originalBitDepth The original bit depth of the data.
120			* One of "8", "16", "24", "32", "32f", "64"
121			* @param {string} targetBitDepth The new bit depth of the data.
122			* One of "8", "16", "24", "32", "32f", "64"
123			* @return {Function}
124			*/
125			function getBitDepthFunction(originalBitDepth, targetBitDepth) {
126			let prefix;
127			let suffix;
128			if (["32f", "64"].includes(originalBitDepth)) {
129			prefix = "float";
130			} else {
131			prefix = "int";
132			}
133			if (["32f", "64"].includes(targetBitDepth)) {
134			suffix = "Float";
135			} else {
136			suffix = "Int";
137			}
138			return BitDepthFunctions[prefix + "To" + suffix];
139			}
140
141			/**
142			* Sign unsigned 8-bit data.
143			* @param {number} sample The sample.
144			* @param {string} originalBitDepth The original bit depth of the data.
145			* One of "8", "16", "24", "32", "32f", "64"
146			* @return {number}
147			*/
148			function sign8Bit(sample, originalBitDepth) {
149			if (originalBitDepth == "8") {
150			sample -= 128;
151			}
152			return sample;
153			}
154
155			/**
156			* Unsign signed 8-bit data.
157			* @param {number} sample The sample.
158			* @param {string} targetBitDepth The target bit depth of the data.
159			* One of "8", "16", "24", "32", "32f", "64"
160			* @return {number}
161			*/
162			function unsign8Bit(sample, targetBitDepth) {
163			if (targetBitDepth == "8") {
164			sample += 128;
165			}
166			return sample;
167			}
168
169			/**
170			* Validate the bit depth.
171			* @param {string} originalBitDepth The original bit depth.
172			* Should be one of "8", "16", "24", "32", "32f", "64".
173			* @param {string} targetBitDepth The target bit depth.
174			* Should be one of "8", "16", "24", "32", "32f", "64".
175			* @throws {Error} If any argument does not meet the criteria.
176			* @return {boolean}
177			*/
178			function validateBitDepths(originalBitDepth, targetBitDepth) {
179			let validBitDepths = ["8", "16", "24", "32", "32f", "64"];
180			if (validBitDepths.indexOf(originalBitDepth) == -1 \|\|
181			validBitDepths.indexOf(targetBitDepth) == -1) {
182			throw new Error("Invalid bit depth.");
183			}
184			return true;
185			}
186
187			module.exports.toBitDepth = toBitDepth;
188			module.exports.BitDepthMaxValues = BitDepthMaxValues;
189

rochars / bitdepth

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index.js ➔ sign8Bit A

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