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The audio object is a JavaScript object for use with roNodeJs that allows the playback of audio by replicating functionality from the HTML5 audio element.

audio IDL

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language	js	title	audio IDL

interface Audio {
  // error state
  readonly attribute MediaError error;
 
  // network state
           attribute String src;
  readonly attribute String currentSrc;
  readonly attribute unsigned short networkState;
  const unsigned short NETWORK_EMPTY = 0;
  const unsigned short NETWORK_IDLE = 1;
  const unsigned short NETWORK_LOADING = 2;
  const unsigned short NETWORK_NO_SOURCE = 3;
 
  void load();
  String canPlayType(String type);
 
  // ready state
  readonly attribute unsigned short readyState;
  const unsigned short HAVE_NOTHING = 0;
  const unsigned short HAVE_METADATA = 1;
  const unsigned short HAVE_CURRENT_DATA = 2;
  const unsigned short HAVE_FUTURE_DATA = 3;
  const unsigned short HAVE_ENOUGH_DATA = 4;
 
  readonly attribute boolean seeking;
 
  // playback state
           attribute double currentTime;
  readonly attribute double duration;
  readonly attribute boolean paused;
           attribute double defaultPlaybackRate;
           attribute double playbackRate;
  readonly attribute boolean ended;
           attribute boolean autoplay;
           attribute boolean loop;
  void play();
  void pause();
 
  void setSyncParams(String domain, String sync_id, String iso_timestamp);
 
  // controls
           attribute double volume;
           attribute boolean muted;
 
  // BrightSign extensions
           attribute String pcmaudio;
           attribute String compaudio;
 
           attribute int x-bs-stream-timeout;
           attribute String x-bs-audio-mode;
 
  // Present but unimplemented
           attribute String preload;
  readonly attribute TimeRanges buffered;
  readonly attribute double initialTime;
  readonly attribute Date startOffsetTime;
           attribute boolean controls;
  readonly attribute TimeRanges played;
  readonly attribute TimeRanges seekable;
 
  readonly attribute TextTrack[] tracks;
  MutableTextTrack addTrack(String kind, optional String label, optional String language);
 
};

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Object Creation

To create an audio object, first load the brightsign/audio module using the require() method. Then create an instance of the audio class using the following example:

Code Block

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var audio_class = require("@brightsign/audio");
var audio_player = new audio_class();

Audio

Use this interface to create audio objects.

Event

seeked: This event is fired when media loops back to the start.

Methods

load()

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void load()

Triggers processing of the src. load starts up playback to the point of being ready to play the first frame. If autoplay is set, then it also starts playback. readyState and networkState are altered, and multiple events fire as playback starts.

canPlayType()

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language	js

 String canPlayType(String type)

Returns whether the passed MIME type can be displayed on the BrightSign player.

play()

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language	js

void play()

Starts or resumes playback.

pause()

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language	js

void pause()

Pauses playback.

setSyncParams()

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language	js

 void setSyncParams(String domain, String sync_id, String iso_timestamp)

This BrightSign extension is documented here.

Audio Parameters

[String]

src

src: Contains the URL of a media resource to use in the element. Only file URLs are supported currently, including relative URLs to the current script and a file:/// URI with an absolute filesystem path on the player. The URL returned when reading this value back is always absolute with file: protocol on the front.
[string] currentSrc: Contains the URL of the media resource in use by the element.
[unsigned short]

networkState

networkState : An enum that indicates the current state of the fetching of media. This attribute moves through the states as src is selected and playback begins, but because support is currently for files only, it is not as dynamic as when used with HTTP.

Possible

Possible values are:
- NETWORK_EMPTY = 0,
- NETWORK_IDLE,
- NETWORK_LOADING,
- NETWORK_NO_

SOURCE

- SOURCE
[unsigned short]

readyState

readyState: Indicates the readiness state of media. This attribute moves through the states as src is selected and playback begins. Possible values are:
- HAVE_NOTHING = 0,
- HAVE_METADATA,
- HAVE_CURRENT_DATA,
- HAVE_FUTURE_DATA,
- HAVE_ENOUGH_DATA
[boolean] seeking: Indicates if the media is seeking to a new position.
[double] currentTime: Specifies the current playback time in seconds as a floating point. Currently seeking is not supported, and setting this attribute has no effect. If playback is completed, this returns the same value as duration.
[double] duration: Specifies the current duration of the media in seconds as a floating point.
[boolean] paused: Reflects whether the media playback is currently paused.
[double]

defaultPlaybackRate

defaultPlaybackRate: This cannot be set to anything other than 1.0, and always returns 1.0 (only normal speed playback is supported).
[double]

playbackRate

playbackRate: This cannot be set to anything other than 1.0, and always returns 1.0 (only normal speed playback is supported).
[bool] ended: Reflects where the media playback has reached the end of the media.
[boolean] autoplay: Indicates whether playback should automatically begin when media is available to play without interruption.
[boolean] loop: Sets whether the playback should loop or not. The value is used when load is called. Setting it once playback has started will have no effect.
[double] volume: Controls the volume of playback
[boolean] muted: Controls the muting and unmuting of the audio
[String] pcmaudio: Route decoded PCM audio to the outputs in the string. Outputs available are analog, earc, or a USB output (for example, usb:A.0). Multiple outputs can be specified by using a semi-colon delimeter (for example, earc; analog)
[String] compaudio: Routes compressed audio direct to eARC without decoding. Can be set to earc only.
[int]

x

x-bs-stream-timeout: Controls timeouts when streaming.
[String] x-bs-audio-mode: Controls the downmix of audio to mono. Possible values are MonoLeftMixdown, MonoRightMixdown, and the default which

is

is Stereo. Using this, two audio players can output to a single stereo output, one to the left channel, and the other to the right channel.

Unimplemented Methods and Properties

preload
buffered
initialTime
startOffsetTime
controls
played
seekable
tracks

Examples

Code Block

language	js

const audio_class = require("@brightsign/audio");
let audio_player = new audio_class();
audio_player.src = "/storage/sd/file.mp4"
audio_player.volume = .5;
audio_player.load();
audio_player.play();

Code Block

language	js

let setupAudio = (audio, setupObj) => {
   for (let [key, val] of Object.entries(setupObj)) {
      audio[key] = val;
   }
}

let interval = setInterval(()=>{}, 10000);
const audio_class = require("@brightsign/audio");
let audio = new audio_class();
let settings = {
   src: '/storage/sd/file.mp4',
   autoplay: true,
   loop: false,
   volume: .5,
   pcmAudio: "analog"
};
setupAudio(audio, settings);
audio.load();
audio.addEventListener("ended", () => {
   audio.src = '';
   audio = null;
   clearInterval(interval);
   process.exit(0);
});

Versions Compared

Old Version 13

New Version 14

Key

audio IDL

Object Creation

Audio

Event

Methods

load()

canPlayType()

play()

pause()

setSyncParams()

Audio Parameters

Unimplemented Methods and Properties

Examples