Minimal player with Feature selection

Overview

The RxPlayer comes with many features, even some you might never need. For example, you may only care for DASH with TTML subtitles and not about Smooth streaming, VTT or SRT parsing.

Because each implementation has its need, we permit multiple ways to import the player with limited features. This principally leads to a smaller file size.

This customization can be done through two principal ways:

• by importing a minimal version and then adding only the features your want

• by setting environment variables at build time

The first solution is the most straightforward and should be used in most usecases. The main disadvantages of this solution are that to reduce file size:

• you will need to use a module-bundler or minifier which performs tree-shaking, like webpack’s production mode.

• you will need to use the package published on npm (as opposed to the git repository directly).

The second solution will always work but needs you to build the bundle yourself through our npm scripts.

Importing a minimal version

How it works

If you imported the RxPlayer library through the npm package (like via the npm install rx-player command), you can import a minimal version of the player by importing it from "rx-player/minimal":

import MinimalRxPlayer from "rx-player/minimal";

// This player has the same API than the RxPlayer, but with no feature
// (e.g. no DASH, Smooth or Directfile playback)
const player = new MinimalRxPlayer();

// use the regular APIs...
player.setVolume(0.5);

You then will need to add the features you want on it. Those can be accessed through the path "rx-player/features":

// import the DASH and Smooth features, which will be added to the RxPlayer
import { DASH, SMOOTH } from "rx-player/features";

At last you can add those features to the imported RxPlayer class by calling the special addFeatures static method, which is only present on the minimal version of the Player:

// addFeatures takes an array of features as argument
MinimalRxPlayer.addFeatures([DASH, SMOOTH]);

Here is the complete example:

import MinimalRxPlayer from "rx-player/minimal";
import { DASH, SMOOTH } from "rx-player/features";

MinimalRxPlayer.addFeatures([DASH, SMOOTH]);

By doing that, you will reduce the final bundle file if tree-shaking is performed on the final code (like in webpack’s production mode).

The key is just to know which feature does what. The next chapter will list and explain the role of every one of them.

List of features

Features, which are variables imported from the "rx-player/features" path, are all objects declared in upper-case.

Here is the anotated exhaustive list (notes are at the bottom of the table):

Feature	Description of the feature
SMOOTH	Enable Smooth streaming (HSS) playback
DASH	Enable DASH playback
DIRECTFILE	Enable playback of “directfile” contents
EME	Enable playback of encrypted contents
NATIVE_TEXT_BUFFER [1]	Allow to manage text tracks through <tracks> elements
HTML_TEXT_BUFFER [1]	Allow to manage text tracks through HTML elements
IMAGE_BUFFER [1]	Allow to manage images buffer
NATIVE_SRT_PARSER [2]	Parse SRT text tracks for the native text buffer
NATIVE_VTT_PARSER [2]	Parse VTT text tracks for the native text buffer
NATIVE_TTML_PARSER [2]	Parse TTML text tracks for the native text buffer
NATIVE_SAMI_PARSER [2]	Parse SAMI text tracks for the native text buffer
HTML_SRT_PARSER [3]	Parse SRT text tracks for the HTML text buffer
HTML_VTT_PARSER [3]	Parse VTT text tracks for the HTML text buffer
HTML_TTML_PARSER [3]	Parse TTML text tracks for the HTML text buffer
HTML_SAMI_PARSER [3]	Parse SAMI text tracks for the HTML text buffer
BIF_PARSER [4]	Parse BIF image tracks for the image buffer

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Notes:

[1]: You will need to also add at least one parser for this type of buffer for it to be useful. (example: NATIVE_SRT_PARSER for the NATIVE_TEXT_BUFFER)

[2]: Those features will only be used if NATIVE_TEXT_BUFFER is an added feature.

[3]: Those features will only be used if HTML_TEXT_BUFFER is an added feature.

[4]: This feature will only be used if IMAGE_BUFFER is an added feature.

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Examples

To help you choose your features, are some examples that represents common usecases.

unencrypted DASH contents with native webVTT subtitles

import RxPlayer from "rx-player/minimal";
import {
  DASH,
  NATIVE_TEXT_BUFFER,
  NATIVE_VTT_PARSER
} from "rx-player/features";

RxPlayer.addFeatures([DASH, NATIVE_TEXT_BUFFER, NATIVE_VTT_PARSER]);

possibly-encrypted DASH contents with HMTL webVTT and TTML subtitles

import RxPlayer from "rx-player/minimal";
import {
  DASH,
  EME,
  HTML_TEXT_BUFFER,
  HTML_VTT_PARSER,
  HTML_HTML_PARSER
} from "rx-player/features";

RxPlayer.addFeatures([
  DASH,
  EME,
  HTML_TEXT_BUFFER,
  HTML_VTT_PARSER,
  HTML_HTML_PARSER
]);

Smooth contents with image (BIF) support

import RxPlayer from "rx-player/minimal";
import {
  SMOOTH,
  IMAGE_BUFFER,
  BIF_PARSER
} from "rx-player/features";

RxPlayer.addFeatures([ SMOOTH, IMAGE_BUFFER, BIF_PARSER ]);

Building with environment variables

How it works

You can also include only the features you need on the RxPlayer library by building it while having specific environment variables.

The code related to the unwanted features should be removed when the final code is minified (as the corresponding code is made unreachable).

To avoid any conflict with other environment variables, they all are named RXP_<FEATURE-NAME>.

For example, the following will remove all code related to Microsoft Smooth Streaming from the build:

RXP_SMOOTH=false npm run build:min

List of environment variables

RXP_SMOOTH

True by default. If set to “false”, all code relative to HSS streaming will be ignored during a build.

RXP_DASH

True by default. If set to “false”, all code relative to DASH streaming will be ignored during a build.

RXP_DIRECTFILE

True by default. If set to “false”, all code relative to directfile streaming will be ignored during a build.

RXP_EME

True by default. If set to “false”, all code relative to encrypted contents will be ignored during a build.

RXP_NATIVE_TTML

True by default. If set to “false”, all code relative to TTML parsing for native text tracks will be ignored during a build.

RXP_NATIVE_SAMI

True by default. If set to “false”, all code relative to SAMI parsing for native text tracks will be ignored during a build.

RXP_NATIVE_VTT

True by default. If set to “false”, all code relative to VTT parsing for native text tracks will be ignored during a build.

RXP_NATIVE_SRT

True by default. If set to “false”, all code relative to SRT parsing for native text tracks will be ignored during a build.

RXP_HTML_TTML

True by default. If set to “false”, all code relative to TTML parsing for html text tracks[1] will be ignored during a build.

RXP_HTML_SAMI

True by default. If set to “false”, all code relative to SAMI parsing for html text tracks[1] will be ignored during a build.

RXP_HTML_VTT

True by default. If set to “false”, all code relative to VTT parsing for html text tracks[1] will be ignored during a build.

RXP_HTML_SRT

True by default. If set to “false”, all code relative to SRT parsing for html text tracks[1] will be ignored during a build.

RXP_BIF_PARSER

True by default. If set to “false”, all code relative to BIF image parsing will be ignored during a build.

RXP_BAREBONE

If set to true, no feature is activated by default and previously-defined environment variables here are all considered as false by default.

For example, to only activate DASH, you could do:

RXP_BAREBONE=true RXP_DASH=true npm run build:min

RXP_ENV

Either “production” or “development”. “production” as a default. In the “development” case:

• logs will be activated
• the code will be less tolerant towards unwanted behavior
• the code will be less optimized

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Notes:

[1] html text tracks are tracks which are added to a DOM element instead of a <track> (the latter here being called “native”) tag for a richer formatting.

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