You can set up a voice-only session when instantiating a Publisher object:
There are a number of user interface optimizations that you can make in a voice-only session:
-
Getting audio levels — The OpenTok client libraries include events that
report the audio level of a subscriber or publisher. For more information, see these topics:
OpenTok.js,
iOS,
iOS (Swift),
Android.
-
Speaker detection — You can use the audio level events to detect active speakers in a session.
For an example using OpenTok.js, see this topic.
-
Displaying a custom volume indicator — You can use the audio level events to display a
volume indicator (such as a meter). For an example using OpenTok.js, see
this topic.
-
Setting an image to display in audio-only mode — You can display an image in a
Publisher or Subscriber that is in audio-only mode. In OpenTok.js, see
this topic.
In iOS and Android, you can simply add an image to the view hierarchy of the app.
-
In the OpenTok Android SDK, you can have the audio played back using the headset speaker (which is preferable in
a voice-only session). See Setting
the audio output mode for a voice session.
When archiving a voice-only session, you can specify that the archive include audio only
(not video) when you create the archive. See the
archiving developer guide.
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