jellyfin-web/src/components/qualityOptions.js

import minBy from 'lodash-es/minBy';
import { appHost } from '../components/apphost';
import globalize from '../lib/globalize';
import appSettings from '../scripts/settings/appSettings';

export function getVideoQualityOptions(options) {
    const maxStreamingBitrate = options.currentMaxBitrate;
    let videoWidth = options.videoWidth;
    const videoHeight = options.videoHeight;
    const videoBitRate = options.videoBitRate ?? -1;

    // Quality options are indexed by bitrate. If you must duplicate them, make sure each of them are unique (by making the last digit a 1)
    // Question: the maxHeight field seems not be used anywhere, is it safe to remove those?
    const bitrateConfigurations = [
        { name: '120 Mbps', maxHeight: 2160, bitrate: 120000000 },
        { name: '80 Mbps', maxHeight: 2160, bitrate: 80000000 },
        { name: '60 Mbps', maxHeight: 2160, bitrate: 60000000 },
        { name: '40 Mbps', maxHeight: 2160, bitrate: 40000000 },
        { name: '20 Mbps', maxHeight: 2160, bitrate: 20000000 },
        { name: '15 Mbps', maxHeight: 1440, bitrate: 15000000 },
        { name: '10 Mbps', maxHeight: 1440, bitrate: 10000000 },
        { name: '8 Mbps', maxHeight: 1080, bitrate: 8000000 },
        { name: '6 Mbps', maxHeight: 1080, bitrate: 6000000 },
        { name: '4 Mbps', maxHeight: 720, bitrate: 4000000 },
        { name: '3 Mbps', maxHeight: 720, bitrate: 3000000 },
        { name: '1.5 Mbps', maxHeight: 720, bitrate: 1500000 },
        { name: '720 kbps', maxHeight: 480, bitrate: 720000 },
        { name: '420 kbps', maxHeight: 360, bitrate: 420000 },
    ]

    const qualityOptions = [];

    const autoQualityOption = {
        name: globalize.translate('Auto'),
        bitrate: 0,
        selected: options.isAutomaticBitrateEnabled
    };

    if (options.enableAuto) {
        qualityOptions.push(autoQualityOption);
    }

    if (videoBitRate > 0 && videoBitRate < 120000000) {
        // Push one entry that has higher limit than video bitrate to allow using source bitrate when Auto is also limited
        const sourceOptions = minBy(bitrateConfigurations.filter((c) => c.bitrate > videoBitRate), (x) => x.bitrate);
        qualityOptions.push(sourceOptions);
    }

    bitrateConfigurations.forEach((c) => {
        if (videoBitRate > 0 && c.bitrate < videoBitRate) {
            qualityOptions.push(c);
        } else if (videoBitRate < 0) {
            qualityOptions.push(c);
        }
    })

    if (maxStreamingBitrate) {
        let selectedIndex = qualityOptions.length - 1;
        for (let i = 0, length = qualityOptions.length; i < length; i++) {
            const option = qualityOptions[i];

            if (option.bitrate > 0 && option.bitrate <= maxStreamingBitrate) {
                selectedIndex = i;
                break;
            }
        }

        const currentQualityOption = qualityOptions[selectedIndex];

        if (!options.isAutomaticBitrateEnabled) {
            currentQualityOption.selected = true;
        } else {
            autoQualityOption.autoText = currentQualityOption.name;
        }
    }

    return qualityOptions;
}

export function getAudioQualityOptions(options) {
    const maxStreamingBitrate = options.currentMaxBitrate;

    const qualityOptions = [];

    const autoQualityOption = {
        name: globalize.translate('Auto'),
        bitrate: 0,
        selected: options.isAutomaticBitrateEnabled
    };

    if (options.enableAuto) {
        qualityOptions.push(autoQualityOption);
    }

    qualityOptions.push({ name: '2 Mbps', bitrate: 2000000 });
    qualityOptions.push({ name: '1.5 Mbps', bitrate: 1500000 });
    qualityOptions.push({ name: '1 Mbps', bitrate: 1000000 });
    qualityOptions.push({ name: '320 kbps', bitrate: 320000 });
    qualityOptions.push({ name: '256 kbps', bitrate: 256000 });
    qualityOptions.push({ name: '192 kbps', bitrate: 192000 });
    qualityOptions.push({ name: '128 kbps', bitrate: 128000 });
    qualityOptions.push({ name: '96 kbps', bitrate: 96000 });
    qualityOptions.push({ name: '64 kbps', bitrate: 64000 });

    if (maxStreamingBitrate) {
        let selectedIndex = qualityOptions.length - 1;
        for (let i = 0, length = qualityOptions.length; i < length; i++) {
            const option = qualityOptions[i];

            if (option.bitrate > 0 && option.bitrate <= maxStreamingBitrate) {
                selectedIndex = i;
                break;
            }
        }

        const currentQualityOption = qualityOptions[selectedIndex];

        if (!options.isAutomaticBitrateEnabled) {
            currentQualityOption.selected = true;
        } else {
            autoQualityOption.autoText = currentQualityOption.name;
        }
    }

    return qualityOptions;
}

export default {
    getVideoQualityOptions,
    getAudioQualityOptions
};