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constant findMimetype

[utils/mimetypes.js](https://docs.videojs.com/utils_mimetypes.js.html), [line 62](https://docs.videojs.com/utils_mimetypes.js.html#line62)

Find the mime type of a given source string if possible. Uses the player source cache.

constant getMimetype

[utils/mimetypes.js](https://docs.videojs.com/utils_mimetypes.js.html), [line 42](https://docs.videojs.com/utils_mimetypes.js.html#line42)

Get the mimetype of a given src url if possible

constant innerHTMLDescriptorPolyfill

[tech/setup-sourceset.js](https://docs.videojs.com/tech_setup-sourceset.js.html), [line 77](https://docs.videojs.com/tech_setup-sourceset.js.html#line77)

our implementation of an innerHTML descriptor for browsers that do not have one.

constant srcDescriptorPolyfill

[tech/setup-sourceset.js](https://docs.videojs.com/tech_setup-sourceset.js.html), [line 207](https://docs.videojs.com/tech_setup-sourceset.js.html#line207)

our implementation of a src descriptor for browsers that do not have one.

Methods

clamp(number, min, max) → {number}

[utils/clamp.js](https://docs.videojs.com/utils_clamp.js.html), [line 15](https://docs.videojs.com/utils_clamp.js.html#line15)

Keep a number between a min and a max value

Parameters:

Returns:

number -

the clamped number

constructColor(color, opacity) → {string}

[tracks/text-track-display.js](https://docs.videojs.com/tracks_text-track-display.js.html), [line 36](https://docs.videojs.com/tracks_text-track-display.js.html#line36)

Construct an rgba color from a given hex color code.

Parameters:

Returns:

string -

The rgba color that was created, like ‘rgba(255, 0, 0, 0.3)’.

defineLazyProperty(obj, key, getValue, setter)

[utils/define-lazy-property.js](https://docs.videojs.com/utils_define-lazy-property.js.html), [line 10](https://docs.videojs.com/utils_define-lazy-property.js.html#line10)

Object.defineProperty but “lazy”, which means that the value is only set after it retrieved the first time, rather than being set right away.

Parameters:

firstSourceWatch(tech)

[tech/setup-sourceset.js](https://docs.videojs.com/tech_setup-sourceset.js.html), [line 155](https://docs.videojs.com/tech_setup-sourceset.js.html#line155)

Patches browser internal functions so that we can tell synchronously if a <source> was appended to the media element. For some reason this causes a sourceset if the the media element is ready and has no source. This happens when:

• The page has just loaded and the media element does not have a source.
• The media element was emptied of all sources, then load() was called.

It does this by patching the following functions/properties when they are supported:

• append() - can be used to add a <source> element to the media element
• appendChild() - can be used to add a <source> element to the media element
• insertAdjacentHTML() - can be used to add a <source> element to the media element
• innerHTML - can be used to add a <source> element to the media element

Parameters:

getDescriptor()

[tech/setup-sourceset.js](https://docs.videojs.com/tech_setup-sourceset.js.html), [line 113](https://docs.videojs.com/tech_setup-sourceset.js.html#line113)

Get a property descriptor given a list of priorities and the property to get.

isPromise(value) → {boolean}

[utils/promise.js](https://docs.videojs.com/utils_promise.js.html), [line 11](https://docs.videojs.com/utils_promise.js.html#line11)

Returns whether an object is Promise-like (i.e. has a then method).

Parameters:

Returns:

boolean -

Whether or not the object is Promise-like.

setupSourceset(tech)

[tech/setup-sourceset.js](https://docs.videojs.com/tech_setup-sourceset.js.html), [line 239](https://docs.videojs.com/tech_setup-sourceset.js.html#line239)

setup sourceset handling on the Html5 tech. This function patches the following element properties/functions:

• src - to determine when src is set
• setAttribute() - to determine when src is set
• load() - this re-triggers the source selection algorithm, and can cause a sourceset.

If there is no source when we are adding sourceset support or during a load() we also patch the functions listed in firstSourceWatch.

Parameters:

silencePromise(value)

[utils/promise.js](https://docs.videojs.com/utils_promise.js.html), [line 24](https://docs.videojs.com/utils_promise.js.html#line24)

Silence a Promise-like object.

This is useful for avoiding non-harmful, but potentially confusing “uncaught play promise” rejection error messages.

Parameters:

sourcesetLoad(tech) → {boolean}

[tech/setup-sourceset.js](https://docs.videojs.com/tech_setup-sourceset.js.html), [line 19](https://docs.videojs.com/tech_setup-sourceset.js.html#line19)

This function is used to fire a sourceset when there is something similar to mediaEl.load() being called. It will try to find the source via the src attribute and then the <source> elements. It will then fire sourceset with the source that was found or empty string if we cannot know. If it cannot find a source then sourceset will not be fired.

Parameters:

Returns:

boolean -

returns false if the sourceset was not fired and true otherwise.

Type Definitions

MenuKeys

[menu/menu-keys.js](https://docs.videojs.com/menu_menu-keys.js.html), [line 5](https://docs.videojs.com/menu_menu-keys.js.html#line5)

All keys used for operation of a menu (MenuButton, Menu, and MenuItem) Note that ‘Enter’ and ‘Space’ are not included here (otherwise they would prevent the MenuButton and MenuItem from being keyboard-clickable)