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Retrieves and plays the specified audio file. If the audio file is unavailable, any enclosed text is sent to the TTS engine for speech synthesis instead.
|src||The URI of the audio prompt. See Section 2.1 for supported audio formats.|
|expr||The expression may be either a reference to audio previously recorded with the item or evaluate to the URI of an audio resource to fetch.|
|stream||The URI of an audio stream to play. Any queued audio is immediately cleared if an MP3 audio stream is opened.|
|fetchhint||This attribute is not supported.|
|fetchtimeout||(defaults to “fetchtimeout” global property value) The timeout for fetches. Must be specified with the appropriate time units (e.g., “120s” for 120 seconds).|
|maxage||(defaults to “audiomaxage” global property value) Tells the platform the maximum acceptable age, in seconds, of cached audio resources.|
|maxstale||(defaults to “audiomaxstale” global property value) Tells the platform the maximum acceptable staleness, in seconds, of expired cached audio resources.|
|maxtime||(defaults to unlimited) The maximum number of seconds of the audio prompt to play.|
|starttime||(defaults to “0s”) The number of seconds into the referenced audio prompt at which to begin playback.|
The setting for the “src” attribute has priority over the setting for the “expr” attribute.
If the wave file at the location specified by the “src” attribute can not be retrieved, the text within the “audio” tag will be read by the TTS engine.
<?xml version="1.0"?> <vxml version="2.0"> <form> <block> <prompt> I'm going to play an audio file. </prompt> <audio src="http://nonexistent.domain.com/test.wav"> Oops, the audio file could not be retrieved! </audio> </block> </form> </vxml>
The output of the above script would be:
Computer: I'm going to play an audio file.
Computer: (plays audio file if available)