The LINEMEDIACONTROL_ bit-flag constants describe a set of generic operations
on media streams. The interpretations are determined by the media stream. The
line device must have the media-control capability for any media-control
operation to be effective.
No change is to be made to the media stream.
Start the media stream.
Reset the media stream. Equivalent to an end-of-input. All buffers are
Temporarily pause the media stream.
Resume a paused media stream.
The speed of the media stream is increased by some stream-defined quantity.
The speed of the media stream is decreased by some stream-defined quantity.
The speed of the media stream is returned to normal.
The amplitude of the media stream is increased by some stream-defined
The amplitude of the media stream is decreased by some stream-defined
The amplitude of the media stream is returned to normal.
The high-order 16 bits can be assigned for device-specific extensions. The
low-order 16 bits are reserved.
Media control is provided to improve performance of actions on media streams
in response to telephony-related events. The application should normally manage
a media stream through the media-specific API. The media-control functionality
provided here is not intended to replace the native media APIs.
Media-control actions can be associated with the detection of digits, the
detection of tones, the transition into a call state, and the detection of a media
mode. Consult a line's device capabilities to determine whether media control
is available on the line.
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