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87 lines
2.7 KiB
87 lines
2.7 KiB
const ffmpeg = require('ffmpeg-static');
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const Jimp = require('jimp');
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const shell = require('any-shell-escape');
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const { exec } = require('child_process');
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const { isProd, path } = require('./utils');
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const { diskFilePath } = require('../config.json');
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// Thumbnail parameters
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const THUMBNAIL = {
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QUALITY: 75,
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WIDTH: 200 * 2,
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HEIGHT: 140 * 2,
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}
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/**
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* Builds a safe escaped ffmpeg command
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* @param {String} src Path to the input file
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* @param {String} dest Path of the output file
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* @returns {String} The command to execute
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*/
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function getCommand(src, dest) {
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return shell([
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ffmpeg, '-y',
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'-v', (isProd ? 'error' : 'debug'), // Log level
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'-i', src, // Input file
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'-ss', '00:00:01.000', // Timestamp of frame to grab
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'-frames:v', '1', // Number of frames to grab
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'-s', `${THUMBNAIL.WIDTH}x${THUMBNAIL.HEIGHT}`, // Dimensions of output file
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dest // Output file
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]);
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}
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/**
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* Builds a thumbnail filename
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* @param {String} oldName The original filename
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* @returns {String} The filename for the thumbnail
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*/
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function getNewName(oldName) {
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return oldName.concat('.thumbnail.jpg');
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}
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/**
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* Builds a path to the thumbnails
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* @param {String} oldName The original filename
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* @returns {String} The path to the thumbnail
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*/
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function getNewNamePath(oldName) {
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return path(diskFilePath, 'thumbnails/', getNewName(oldName));
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}
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/**
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* Extracts an image from a video file to use as a thumbnail, using ffmpeg
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* @param {*} file The video file to pull a frame from
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*/
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function getVideoThumbnail(file) {
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return new Promise((resolve, reject) => exec(
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getCommand(file.path, getNewNamePath(file.randomId)),
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(err) => (err ? reject(err) : resolve())
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));
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}
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/**
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* Generates a thumbnail for the provided image
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* @param {*} file The file to generate a thumbnail for
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*/
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function getImageThumbnail(file) {
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return new Promise((resolve, reject) =>
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Jimp.read(file.path)
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.then((image) => image
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.quality(THUMBNAIL.QUALITY)
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.resize(THUMBNAIL.WIDTH, THUMBNAIL.HEIGHT, Jimp.RESIZE_BICUBIC)
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.write(getNewNamePath(file.randomId)))
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.then(resolve)
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.catch(reject));
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}
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/**
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* Generates a thumbnail
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* @param {*} file The file to generate a thumbnail for
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* @returns The thumbnail filename (NOT the path)
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*/
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module.exports = (file) =>
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new Promise((resolve, reject) =>
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(file.is.video ? getVideoThumbnail : file.is.image ? getImageThumbnail : () => Promise.resolve())(file)
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.then(() => resolve((file.is.video || file.is.image) ? getNewName(file.randomId) : file.is.audio ? 'views/ass-audio-icon.png' : 'views/ass-file-icon.png'))
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.catch(reject));
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