{"json_modified": "2016-10-18T15:54:05.068532", "uuid": "d99bee42-dae8-4da3-bbe5-2c730c29d0f7", "title": "MediaStreamConstraints.audio", "url": "/en-US/docs/Web/API/MediaStreamConstraints/audio", "tags": ["API", "Interface", "WebRTC", "Reference", "Constraints", "Media Streams API", "Audio", "Dictionary", "Web", "getusermedia", "MediaStreamConstraints", "Media Capture and Streams API", "Media", "audio"], "translations": [], "modified": "2016-10-18T15:54:05", "label": "MediaStreamConstraints.audio", "localization_tags": [], "locale": "en-US", "id": 196673, "last_edit": "2016-10-18T15:53:58", "summary": "The <a href=\"/en-US/docs/Web/API/MediaStreamConstraints\" title=\"The MediaStreamConstraints dictionary is used when calling getUserMedia() to specify what kinds of tracks should be included in the returned MediaStream, and, optionally, to establish constraints for those tracks' settings.\"><code>MediaStreamConstraints</code></a> dictionary's <strong><code>audio</code></strong> property is used to indicate what kind of audio track, if any, should be included in the <a href=\"/en-US/docs/Web/API/MediaStream\" title=\"The MediaStream interface represents a stream of media content. A stream consists of several tracks such as&#xA0;video or audio tracks. Each track is specified as an instance of MediaStreamTrack.\"><code>MediaStream</code></a> returned by a call to <a href=\"/en-US/docs/Web/API/MediaDevices/getUserMedia\" title=\"The MediaDevices.getUserMedia() method prompts the user for permission to use one video and/or one audio input device such as a camera or screensharing and/or a microphone. If the user provides permission, then the returned Promise is resolved with the resulting MediaStream object. If the user denies permission, or media is not available, then the promise is rejected with PermissionDeniedError or NotFoundError respectively. Note that it is possible for the returned promise to neither resolve nor reject, as the user is not required to make a choice.\"><code>getUserMedia()</code></a>.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Value", "title": "Value"}, {"id": "Example", "title": "Examples"}, {"id": "Using_a_Boolean_value", "title": "Using a Boolean value"}, {"id": "HTML_content", "title": "HTML content"}, {"id": "CSS_content", "title": "CSS content"}, {"id": "JavaScript_content", "title": "JavaScript content"}, {"id": "Result", "title": "Result"}, {"id": "Using_a_MediaTrackConstraints_object", "title": "Using a MediaTrackConstraints object"}, {"id": "HTML_content_2", "title": "HTML content"}, {"id": "CSS_content_2", "title": "CSS content"}, {"id": "JavaScript_content_2", "title": "JavaScript content"}, {"id": "Result_2", "title": "Result"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/MediaStreamConstraints/audio", "review_tags": []}