filmout_manager/dist/ffprobe/index.js

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
exports.FFPROBE = void 0;
const promises_1 = require("fs/promises");
const path_1 = require("path");
const shell_1 = require("../shell");
const log_1 = require("../log");
/**
 * Class representing all ffprobe features.
 */
class FFPROBE {
    constructor(bin = 'ffprobe') {
        this.bin = bin;
        this.log = (0, log_1.createLog)('ffprobe2');
    }
    async exists(path) {
        try {
            await (0, promises_1.access)(path);
            return true;
        }
        catch {
            return false;
        }
    }
    /**
     * Parse the fps entry into a float representing the fps of a video
     **/
    parseFps(fpsStr) {
        let fps = 30.0;
        let parts;
        if (fpsStr.indexOf('/') !== -1) {
            parts = fpsStr.split('/');
            fps = parseFloat(parts[0]) / parseFloat(parts[1]);
        }
        else {
            fps = parseFloat(fpsStr);
        }
        return fps;
    }
    /**
     * Get info on a video in json format. Use for filmout.
     *
     * @param {string} video Path to video
     *
     * @returns {object} Video info in an object
     **/
    async info(video) {
        const cmd = [
            this.bin,
            '-v', 'quiet',
            '-print_format', 'json',
            '-show_format',
            '-show_streams',
            video
        ];
        let fileExists;
        let raw;
        let json;
        let vid; //whether video has stream with video data
        try {
            fileExists = await this.exists(video);
        }
        catch (err) {
            this.log.error(`Error checking if ${video} exists`, err);
        }
        if (!fileExists) {
            this.log.error(new Error(`File ${video} does not exist`));
            return null;
        }
        try {
            raw = await this.exec(cmd);
        }
        catch (err) {
            this.log.error('Error getting info', err);
            return null;
        }
        try {
            json = JSON.parse(raw);
        }
        catch (err) {
            this.log.error('Error parsing stdout', err);
            this.log.error(raw);
            return raw;
        }
        if (json.format && json.format.duration) {
            json.seconds = parseFloat(json.format.duration);
        }
        if (json && json.streams) {
            vid = json.streams.find((stream) => {
                if (stream.width && stream.height)
                    return stream;
            });
        }
        if (vid) {
            json.width = vid.width;
            json.height = vid.height;
            json.fps = this.parseFps(vid.r_frame_rate);
        }
        return json;
    }
    async exec(cmd) {
        return new Promise(async (resolve, reject) => {
            function after(lines) {
                return resolve(lines);
            }
            const child = new shell_1.Shell(cmd, null, null, after, true);
            await child.execute();
        });
    }
    /**
     * Count the number of frames in the video using one of two methods.
     * The first uses -select_streams and is very fast. The second uses
     * -count_frames and is VERY slow.
     *
     * @param {string} video Path to video
     *
     * @returns {integer} Number of frames in video
     **/
    async frames(video) {
        const ext = (0, path_1.extname)(video.toLowerCase());
        let cmd = [
            this.bin,
            '-v', 'error',
            '-select_streams', 'v:0',
            '-show_entries', 'stream=nb_frames',
            '-of', 'default=nokey=1:noprint_wrappers=1',
            video
        ];
        let backup_cmd = [
            this.bin,
            '-v', 'error',
            '-count_frames',
            '-select_streams', 'v:0',
            '-show_entries', 'stream=nb_read_frames',
            '-of', 'default=nokey=1:noprint_wrappers=1',
            video
        ];
        let fileExists;
        let raw;
        let frames;
        try {
            fileExists = await this.exists(video);
        }
        catch (err) {
            this.log.error('Error checking if file exists', err);
            return false;
        }
        if (!fileExists) {
            this.log.error(new Error(`File ${video} does not exist`));
            return false;
        }
        if (ext === '.mkv') {
            cmd = backup_cmd;
        }
        try {
            raw = await this.exec(cmd);
        }
        catch (err) {
            this.log.error(err);
            return false;
        }
        try {
            frames = parseInt(raw.stdout);
        }
        catch (err) {
            return raw.stdout;
        }
        return frames;
    }
}
exports.FFPROBE = FFPROBE;
/*
function map (obj : any) {
    console.dir(obj);
}
*/
module.exports = { FFPROBE };
//# sourceMappingURL=index.js.map