export function createPrejoinTracks()

in react/features/base/tracks/functions.js [204:286]
63 lines of code
15 McCabe index (conditional complexity)

export function createPrejoinTracks() {
    const errors = {};
    const initialDevices = [ 'audio' ];
    const requestedAudio = true;
    let requestedVideo = false;
    const { startAudioOnly, startWithAudioMuted, startWithVideoMuted } = APP.store.getState()['features/base/settings'];

    // Always get a handle on the audio input device so that we have statistics even if the user joins the
    // conference muted. Previous implementation would only acquire the handle when the user first unmuted,
    // which would results in statistics ( such as "No audio input" or "Are you trying to speak?") being available
    // only after that point.
    if (startWithAudioMuted) {
        APP.store.dispatch(setAudioMuted(true));
    }

    if (!startWithVideoMuted && !startAudioOnly) {
        initialDevices.push('video');
        requestedVideo = true;
    }

    let tryCreateLocalTracks;

    if (!requestedAudio && !requestedVideo) {
        // Resolve with no tracks
        tryCreateLocalTracks = Promise.resolve([]);
    } else {
        tryCreateLocalTracks = createLocalTracksF({
            devices: initialDevices,
            firePermissionPromptIsShownEvent: true
        })
                .catch(err => {
                    if (requestedAudio && requestedVideo) {

                        // Try audio only...
                        errors.audioAndVideoError = err;

                        return (
                            createLocalTracksF({
                                devices: [ 'audio' ],
                                firePermissionPromptIsShownEvent: true
                            }));
                    } else if (requestedAudio && !requestedVideo) {
                        errors.audioOnlyError = err;

                        return [];
                    } else if (requestedVideo && !requestedAudio) {
                        errors.videoOnlyError = err;

                        return [];
                    }
                    logger.error('Should never happen');
                })
                .catch(err => {
                    // Log this just in case...
                    if (!requestedAudio) {
                        logger.error('The impossible just happened', err);
                    }
                    errors.audioOnlyError = err;

                    // Try video only...
                    return requestedVideo
                        ? createLocalTracksF({
                            devices: [ 'video' ],
                            firePermissionPromptIsShownEvent: true
                        })
                        : [];
                })
                .catch(err => {
                    // Log this just in case...
                    if (!requestedVideo) {
                        logger.error('The impossible just happened', err);
                    }
                    errors.videoOnlyError = err;

                    return [];
                });
    }

    return {
        tryCreateLocalTracks,
        errors
    };
}