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comply with lint
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Brunon Blok
parent
6ebbd15ab2
commit
eb94c6f35b
1 changed files with 40 additions and 37 deletions
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@ -112,12 +112,12 @@ class GenerateSpectrogram extends Operation {
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*/
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async getSpectrogram(sampleChannels, sampleRate, args) {
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/* args */
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const frameSize = parseInt(args[0]);
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const overlap = (parseInt(args[1]) / 100) * frameSize;
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const frameSize = parseInt(args[0], 10);
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const overlap = (parseInt(args[1], 10) / 100) * frameSize;
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const colorScheme = args[2];
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const gain = args[3];
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const channelNum = args[4];
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const include_axes = args[5];
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const includeAxes = args[5];
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if (sampleChannels[channelNum] == null) {
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throw new OperationError(`Invalid channel number: ${channelNum}`);
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@ -127,43 +127,48 @@ class GenerateSpectrogram extends Operation {
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const MAX_FREQ = sampleRate / 2;
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/* positions and sizes */
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let padding_left = 0;
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let padding_right = 0;
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let padding_bottom = 0;
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if (include_axes){
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padding_left = Math.log10(MAX_FREQ) * 10 + 10 * 3; // space for the text (10px per digit)
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padding_right = 50;
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padding_bottom = 20;
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let paddingLeft = 0;
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let paddingRight = 0;
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let paddingBottom = 0;
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if (includeAxes) {
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paddingLeft = Math.log10(MAX_FREQ) * 10 + 10 * 3; // space for the frequency labels (10px per digit)
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paddingRight = 50;
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paddingBottom = 20;
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}
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const width = channel.length / (frameSize - overlap);
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const height = frameSize / 2;
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const image_width = width + padding_left + padding_right;
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const image_height = height + padding_bottom;
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const imageWidth = width + paddingLeft + paddingRight;
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const imageHeight = height + paddingBottom;
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/* create an image */
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const image = new jimp(image_width, image_height, (err, image) => {});
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const image = new jimp(imageWidth, imageHeight, (err, image) => {});
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if (isWorkerEnvironment())
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self.sendStatusMessage("Generating a spectrogram from data...");
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/**
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* Returns a function filling a pixel with given color
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* @param {array<number>} rgba
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* @returns function
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*/
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function fill(rgba) {
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return function(x, y, idx) {
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this.bitmap.data[idx + 0] = rgba[0];
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this.bitmap.data[idx + 1] = rgba[1];
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this.bitmap.data[idx + 2] = rgba[2];
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this.bitmap.data[idx + 3] = rgba[3];
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}
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};
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}
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/* fill with black */
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image.scan(0, 0, image.bitmap.width, image.bitmap.height, fill([0, 0, 0, 255]).bind(image));
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if (include_axes) {
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if (includeAxes) {
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/* draw border */
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image.scan(padding_left - 1, height + 1, width + 2, 1, fill([255, 255, 255, 255]).bind(image)); // horizontal
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image.scan(padding_left - 1, 0, 1, height + 1, fill([255, 255, 255, 255]).bind(image)); // vertical (left)
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image.scan(padding_left + width + 1, 0, 1, height + 1, fill([255, 255, 255, 255]).bind(image)); // vertical (right)
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image.scan(paddingLeft - 1, height + 1, width + 2, 1, fill([255, 255, 255, 255]).bind(image)); // horizontal
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image.scan(paddingLeft - 1, 0, 1, height + 1, fill([255, 255, 255, 255]).bind(image)); // vertical (left)
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image.scan(paddingLeft + width + 1, 0, 1, height + 1, fill([255, 255, 255, 255]).bind(image)); // vertical (right)
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/* set font */
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const font = await import(/* webpackMode: "eager" */ "../../web/static/fonts/bmfonts/Roboto72White.fnt");
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@ -177,12 +182,12 @@ class GenerateSpectrogram extends Operation {
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const textImage = new jimp(image.bitmap.width * textScale, image.bitmap.height * textScale, (err, image) => {});
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/* write min and max frequency */
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textImage.print(jimpFont, /* align to right */ (padding_left - 30) * textScale, (height - 10) * textScale, "0 Hz");
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textImage.print(jimpFont, /* align to right */ (padding_left - (Math.log10(MAX_FREQ) + 1) * 10) * textScale, 5 * textScale, `${(MAX_FREQ).toFixed(0)} Hz`);
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textImage.print(jimpFont, /* align to right */ (paddingLeft - 30) * textScale, (height - 10) * textScale, "0 Hz");
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textImage.print(jimpFont, /* align to right */ (paddingLeft - (Math.log10(MAX_FREQ) + 1) * 10) * textScale, 5 * textScale, `${(MAX_FREQ).toFixed(0)} Hz`);
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/* write min and max time */
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textImage.print(jimpFont, (padding_left - 5) * textScale, (height + 5) * textScale, "0 s");
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textImage.print(jimpFont, (padding_left + width) * textScale, (height + 5) * textScale, `${(channel.length / sampleRate).toFixed(0)} s`);
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textImage.print(jimpFont, (paddingLeft - 5) * textScale, (height + 5) * textScale, "0 s");
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textImage.print(jimpFont, (paddingLeft + width) * textScale, (height + 5) * textScale, `${(channel.length / sampleRate).toFixed(0)} s`);
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/* draw the scaled image on the original image */
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textImage.scaleToFit(image.bitmap.width, image.bitmap.height);
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@ -191,7 +196,7 @@ class GenerateSpectrogram extends Operation {
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const rfft = new RFFT(frameSize, sampleRate);
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let frames = [];
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const frames = [];
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for (let start = 0; start < channel.length; start += (frameSize - overlap)) {
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let chunk = channel.slice(start, start+frameSize);
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@ -205,12 +210,12 @@ class GenerateSpectrogram extends Operation {
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/* get frequency spectrum */
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const freq = rfft.forward(chunk);
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let frame = [];
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const frame = [];
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for (let i = 0; i < freq.length; i++) {
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/* convert to decibels */
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let strength = 10 * Math.log10(Math.abs(freq[i])) + gain;
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if (freq[i] == 0) // avoid -Infinity
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if (freq[i] === 0) // avoid -Infinity
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strength = 0;
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if (strength < 0)
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@ -231,7 +236,7 @@ class GenerateSpectrogram extends Operation {
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}
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/* draw */
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let pos_x = padding_left;
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let posX = paddingLeft;
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for (let i = 0; i < frames.length; i++) {
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for (let j = 0; j < frames[i].length; j++) {
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const colorStrength = (frames[i][j] / max) * 255;
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@ -254,9 +259,9 @@ class GenerateSpectrogram extends Operation {
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throw new OperationError(`Unknown color scheme: ${colorScheme}`);
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}
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image.scan(pos_x, height - j, 1, 1, fill(color).bind(image));
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image.scan(posX, height - j, 1, 1, fill(color).bind(image));
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}
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pos_x++;
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posX++;
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}
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/* get image data */
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@ -267,7 +272,7 @@ class GenerateSpectrogram extends Operation {
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throw new OperationError(`Error generating image. (${err})`);
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}
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return `<img src="data:image/png;base64,${toBase64(imageBuffer)}" />`
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return `<img src="data:image/png;base64,${toBase64(imageBuffer)}" />`;
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}
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/**
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@ -291,8 +296,7 @@ class GenerateSpectrogram extends Operation {
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let wave;
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try {
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wave = new wavefile.WaveFile(data);
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}
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catch (err) {
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} catch (err) {
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throw new OperationError("Invalid WAV file");
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}
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@ -304,8 +308,7 @@ class GenerateSpectrogram extends Operation {
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let sampleChannels = [];
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if (numChannels > 1) {
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sampleChannels = wave.getSamples(); // returns an array of arrays
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}
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else {
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} else {
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sampleChannels.push(wave.getSamples()); // returns an array
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}
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