mp4filechecker/cjs/index.js

Check details of an mp4 file, e.g. to determine if transcoding is required

"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
function _export(target, all) {
    for(var name in all)Object.defineProperty(target, name, {
        enumerable: true,
        get: Object.getOwnPropertyDescriptor(all, name).get
    });
}
_export(exports, {
    get DEFAULT_OPTIONS () {
        return DEFAULT_OPTIONS;
    },
    get checkMp4File () {
        return checkMp4File;
    }
});
const _mp4box = /*#__PURE__*/ _interop_require_wildcard(require("mp4box"));
function _getRequireWildcardCache(nodeInterop) {
    if (typeof WeakMap !== "function") return null;
    var cacheBabelInterop = new WeakMap();
    var cacheNodeInterop = new WeakMap();
    return (_getRequireWildcardCache = function(nodeInterop) {
        return nodeInterop ? cacheNodeInterop : cacheBabelInterop;
    })(nodeInterop);
}
function _interop_require_wildcard(obj, nodeInterop) {
    if (!nodeInterop && obj && obj.__esModule) {
        return obj;
    }
    if (obj === null || typeof obj !== "object" && typeof obj !== "function") {
        return {
            default: obj
        };
    }
    var cache = _getRequireWildcardCache(nodeInterop);
    if (cache && cache.has(obj)) {
        return cache.get(obj);
    }
    var newObj = {
        __proto__: null
    };
    var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor;
    for(var key in obj){
        if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) {
            var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null;
            if (desc && (desc.get || desc.set)) {
                Object.defineProperty(newObj, key, desc);
            } else {
                newObj[key] = obj[key];
            }
        }
    }
    newObj.default = obj;
    if (cache) {
        cache.set(obj, newObj);
    }
    return newObj;
}
const DEFAULT_OPTIONS = {
    maxWidth: 1280,
    maxHeight: 720,
    supportedMimeTypes: [
        'video/mp4'
    ],
    supportedVideoCodecs: [
        /^avc1\.42e0/,
        /^avc1\.4d40/,
        /^avc1\.6400/
    ],
    supportedAudioCodecs: [
        'mp4a.40.2',
        'mp4a.40.5'
    ]
};
const loadBuffer = (blob)=>new Promise(function(resolve, reject) {
        const fileReader = new FileReader();
        fileReader.onload = function(evt) {
            if (!evt.target) {
                reject(new Error('File could not be read'));
            } else if (evt.target.error) {
                reject(evt.target.error);
            } else {
                resolve(evt.target.result);
            }
        };
        fileReader.readAsArrayBuffer(blob);
    });
async function* loadChunks(file, chunkSize = 64 * 1024) {
    const fileSize = file.size;
    let offset = 0;
    while(offset <= fileSize){
        const chunkBlob = file.slice(offset, chunkSize + offset);
        const chunkData = await loadBuffer(chunkBlob);
        chunkData.fileStart = offset;
        yield chunkData;
        offset += chunkData.byteLength;
    }
}
const matchesOne = (candidateValue, testValues)=>{
    return testValues.some((testCase)=>{
        if (testCase instanceof RegExp) {
            return testCase.test(candidateValue);
        } else {
            return candidateValue === testCase;
        }
    });
};
const isMatch = (info, options)=>{
    const tracks = info.tracks;
    return tracks.every((track)=>{
        if (track.type === 'video') {
            const isSupportedCodec = matchesOne(track.codec, options.supportedVideoCodecs);
            const isSupportedWidth = track.video.width <= options.maxWidth;
            const isSupportedHeight = track.video.height <= options.maxHeight;
            return isSupportedCodec && isSupportedWidth && isSupportedHeight;
        } else if (track.type === 'audio') {
            return matchesOne(track.codec, options.supportedAudioCodecs);
        } else {
            return true;
        }
    });
};
const checkMp4File = async (file, options = DEFAULT_OPTIONS)=>{
    if (!file || !matchesOne(file.type, options.supportedMimeTypes)) {
        return false;
    }
    const box = _mp4box.createFile();
    let result = null;
    box.onReady = (info)=>{
        result = info;
    };
    for await (const chunk of loadChunks(file)){
        box.appendBuffer(chunk);
        if (result) {
            break;
        }
    }
    if (result === null) {
        return false;
    } else {
        return isMatch(result, options);
    }
};