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LINEMEDIACONTROLTONE
The LINEMEDIACONTROLTONE structure describes a media action to be executed when a tone has been
detected. It is used as an entry in an array.
typedef struct linemediacontroltone_tag {
DWORD dwAppSpecific;
DWORD dwDuration;
DWORD dwFrequency1;
DWORD dwFrequency2;
DWORD dwFrequency3;
DWORD dwMediaControl;
} LINEMEDIACONTROLTONE, FAR *LPLINEMEDIACONTROLTONE;
Members
dwAppSpecific
This field is used by the application for tagging the tone. When this tone is
detected, the value of the dwAppSpecific field is passed back to the application.
dwDuration
The duration in milliseconds during which the tone should be present before a
detection is made.
dwFrequency1
dwFrequency2
dwFrequency3
The frequency in Hertz of a component of the tone. If fewer than three
frequencies are needed in the tone, a value of zero should be used for the unused
frequencies. A tone with all three frequencies set to zero is interpreted as
silence and can be use for silence detection.
dwMediaControl
The media-control action. This field uses the following LINEMEDIACONTROL_
constants:
LINEMEDIACONTROL_NONE
No change is to be made to the media stream.
LINEMEDIACONTROL_RESET
Reset the media stream. Equivalent to an end-of-input. All buffers are
released.
LINEMEDIACONTROL_PAUSE
Temporarily pause the media stream.
LINEMEDIACONTROL_RESUME
Start or resume a paused media stream.
LINEMEDIACONTROL_RATEUP
The speed of the media stream is increased by some stream-defined quantity.
LINEMEDIACONTROL_RATEDOWN
The speed of the media stream is decreased by some stream-defined quantity.
LINEMEDIACONTROL_RATENORMAL
The speed of the media stream is returned to normal.
LINEMEDIACONTROL_VOLUMEUP
The amplitude of the media stream is increased by some stream-defined
quantity.
LINEMEDIACONTROL_VOLUMEDOWN
The amplitude of the media stream is decreased by some stream-defined
quantity.
LINEMEDIACONTROL_VOLUMENORMAL
The amplitude of the media stream is returned to normal.
Remarks
No extensions.
The LINEMEDIACONTROLTONE structure defines a tuple <tone, media-control action>. An array of these
tuples is passed to the lineSetMediaControl function to set media-control actions triggered by media-mode changes for a
given call. When a change to a listed media mode is detected, the corresponding
action on the media stream is invoked.
A tone with all frequencies set to zero corresponds to silence. An application
can thus monitor the call's information stream for silence.
See Also
lineSetMediaControl
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