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ass/thumbnails.js

84 lines
2.6 KiB

const ffmpeg = require('ffmpeg-static');
const Jimp = require('jimp');
const shell = require('any-shell-escape');
const { exec } = require('child_process');
const { path } = require('./utils');
const { diskFilePath } = require('./config.json');
// Thumbnail parameters
const THUMBNAIL_QUALITY = 50;
const THUMBNAIL_SIZE = 512;
/**
* Builds a safe escaped ffmpeg command
* @param {String} src Path to the input file
* @param {String} dest Path of the output file
* @returns {String} The command to execute
*/
function getCommand(src, dest) {
return shell([
ffmpeg, '-y',
'-v', (process.env.NODE_ENV === 'production' ? 'error' : 'debug'), // Log level
'-i', src, // Input file
'-ss', '00:00:01.000', // Timestamp of frame to grab
'-frames:v', '1', // Number of frames to grab
'-s', `${THUMBNAIL_SIZE}x${THUMBNAIL_SIZE}`, // Dimensions of output file
dest // Output file
]);
}
/**
* Builds a thumbnail filename
* @param {String} oldName The original filename
* @returns {String} The filename for the thumbnail
*/
function getNewName(oldName) {
return oldName.concat('.thumbnail.jpg');
}
/**
* Builds a path to the thumbnails
* @param {String} oldName The original filename
* @returns {String} The path to the thumbnail
*/
function getNewNamePath(oldName) {
return path(diskFilePath, 'thumbnails/', getNewName(oldName));
}
/**
* Extracts an image from a video file to use as a thumbnail, using ffmpeg
* @param {*} file The video file to pull a frame from
*/
function getVideoThumbnail(file) {
return new Promise((resolve, reject) => exec(
getCommand(file.path, getNewNamePath(file.originalname)),
(err) => (err ? reject(err) : resolve())
));
}
/**
* Generates a thumbnail for the provided image
* @param {*} file The file to generate a thumbnail for
*/
function getImageThumbnail(file) {
return new Promise((resolve, reject) =>
Jimp.read(file.path)
.then((image) => image
.quality(THUMBNAIL_QUALITY)
.resize(THUMBNAIL_SIZE, THUMBNAIL_SIZE, Jimp.RESIZE_BICUBIC)
.write(getNewNamePath(file.originalname)))
.then(resolve)
.catch(reject));
}
/**
* Generates a thumbnail
* @param {*} file The file to generate a thumbnail for
* @returns The thumbnail filename (NOT the path)
*/
module.exports = (file) =>
new Promise((resolve, reject) =>
(file.mimetype.includes('video') ? getVideoThumbnail : getImageThumbnail)(file)
.then(() => resolve(getNewName(file.originalname)))
.catch(reject));