AMinInputGain(3X)

NAME

AMinInputGain − get minimum input gain supported by audio controller

SYNOPSIS

#include <Alib.h> AGainDB
AMinInputGain (

Audio ∗ audio );

DESCRIPTION

AMinInputGain() returns the minimum input gain supported by the audio controller associated with the audio connection. If the application specifies a gain lower than this, the gain is set to AZeroGain, which results in no sound.

audio specifies the Audio structure associated with this connection.

RETURN VALUE

Upon successful completion, AMinInputGain() returns the minimum input gain, in decibels, that the audio controller supports.

ERRORS

AMinInputGain() does not return an error status. Note that the application program may crash if audio does not point to a valid Audio structure.

EXAMPLE

The following example gets the minimum input gain supported by the audio controller.

AGainDB min_in; /∗ min input gain ∗/

Audio ∗ audio; /∗ audio connection ∗/
.
.
.

/∗ get min input gain ∗/

min_in = AMinInputGain(audio);

NOTES

AMinInputGain() is a convenience function that enables the client program to examine a component of the internal Audio structure that is created by AOpenAudio(). The contents of the structure should be treated as read-only.

In order to ensure that the compiler finds the Audio Library (libAlib.sl) and the Alib.h header file, you must add the following switches:

-L /opt/audio/lib
-I/opt/audio/include

DEPENDENCIES

This function belongs to the Audio Library of functions that manage connections to an audio server. The audio server must run on a system that has audio hardware. To find out whether or not your system has audio hardware, refer to Using the Audio Developer’s Kit or the online help for the Audio control panel. For information about the audio capabilities of a particular system use the online example audioinfo.c.

AUTHOR

AMinInputGain() was developed by HP.

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