in conference.js [484:651]
createInitialLocalTracks(options = {}) {
const errors = {};
// Always get a handle on the audio input device so that we have statistics (such as "No audio input" or
// "Are you trying to speak?" ) even if the user joins the conference muted.
const initialDevices = config.disableInitialGUM ? [] : [ 'audio' ];
const requestedAudio = !config.disableInitialGUM;
let requestedVideo = false;
if (!config.disableInitialGUM
&& !options.startWithVideoMuted
&& !options.startAudioOnly
&& !options.startScreenSharing) {
initialDevices.push('video');
requestedVideo = true;
}
if (!config.disableInitialGUM) {
JitsiMeetJS.mediaDevices.addEventListener(
JitsiMediaDevicesEvents.PERMISSION_PROMPT_IS_SHOWN,
browserName =>
APP.store.dispatch(
mediaPermissionPromptVisibilityChanged(true, browserName))
);
}
JitsiMeetJS.mediaDevices.addEventListener(
JitsiMediaDevicesEvents.SLOW_GET_USER_MEDIA,
() => APP.store.dispatch(toggleSlowGUMOverlay(true))
);
let tryCreateLocalTracks;
// On Electron there is no permission prompt for granting permissions. That's why we don't need to
// spend much time displaying the overlay screen. If GUM is not resolved within 15 seconds it will
// probably never resolve.
const timeout = browser.isElectron() ? 15000 : 60000;
// FIXME is there any simpler way to rewrite this spaghetti below ?
if (options.startScreenSharing) {
tryCreateLocalTracks = this._createDesktopTrack()
.then(([ desktopStream ]) => {
if (!requestedAudio) {
return [ desktopStream ];
}
return createLocalTracksF({
devices: [ 'audio' ],
timeout,
firePermissionPromptIsShownEvent: true,
fireSlowPromiseEvent: true
})
.then(([ audioStream ]) =>
[ desktopStream, audioStream ])
.catch(error => {
errors.audioOnlyError = error;
return [ desktopStream ];
});
})
.catch(error => {
logger.error('Failed to obtain desktop stream', error);
errors.screenSharingError = error;
return requestedAudio
? createLocalTracksF({
devices: [ 'audio' ],
timeout,
firePermissionPromptIsShownEvent: true,
fireSlowPromiseEvent: true
})
: [];
})
.catch(error => {
errors.audioOnlyError = error;
return [];
});
} else if (!requestedAudio && !requestedVideo) {
// Resolve with no tracks
tryCreateLocalTracks = Promise.resolve([]);
} else {
tryCreateLocalTracks = createLocalTracksF({
devices: initialDevices,
timeout,
firePermissionPromptIsShownEvent: true,
fireSlowPromiseEvent: true
})
.catch(err => {
if (requestedAudio && requestedVideo) {
// Try audio only...
errors.audioAndVideoError = err;
if (err.name === JitsiTrackErrors.TIMEOUT && !browser.isElectron()) {
// In this case we expect that the permission prompt is still visible. There is no point of
// executing GUM with different source. Also at the time of writing the following
// inconsistency have been noticed in some browsers - if the permissions prompt is visible
// and another GUM is executed the prompt does not change its content but if the user
// clicks allow the user action isassociated with the latest GUM call.
errors.audioOnlyError = err;
errors.videoOnlyError = err;
return [];
}
return (
createLocalTracksF({
devices: [ 'audio' ],
timeout,
firePermissionPromptIsShownEvent: true,
fireSlowPromiseEvent: 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,
fireSlowPromiseEvent: true
})
: [];
})
.catch(err => {
// Log this just in case...
if (!requestedVideo) {
logger.error('The impossible just happened', err);
}
errors.videoOnlyError = err;
return [];
});
}
// Hide the permissions prompt/overlay as soon as the tracks are
// created. Don't wait for the connection to be made, since in some
// cases, when auth is required, for instance, that won't happen until
// the user inputs their credentials, but the dialog would be
// overshadowed by the overlay.
tryCreateLocalTracks.then(tracks => {
APP.store.dispatch(toggleSlowGUMOverlay(false));
APP.store.dispatch(mediaPermissionPromptVisibilityChanged(false));
return tracks;
});
return {
tryCreateLocalTracks,
errors
};
},