NAME

ASetGain − set play volume or record gain of specified transaction

SYNOPSIS

#include <audio/Alib.h>

void ASetGain(

Audio *audio,
ATransID xid,
AGainDB gain,
long *status_return

);

DESCRIPTION

ASetGain() sets the play volume or record gain of the transaction specified in xid.

audio specifies the Audio structure associated with this connection. 

xid specifies the ID of the transaction that was returned by ACreateSBucket() or ALoadAFile(). 

gain specifies the new values for the play volume or record gain. 

status_return receives the returned status of the operation unless it is set to NULL. 

ERRORS

If status_return is not set to NULL, one of the following is returned in status_return. 

 0 AENoError

 2 AEBadAudio

15 AEBadTransactionID

EXAMPLES

The following example sets the gain for the xid transaction to be AUnityGain (unchanged) and sets up status to receive an error status:

Audio *audio;    /* audio connection */
ATransID xid;    /* transaction ID */
AGainDB gain;    /* gain */
long status;     /* error status */
.
.
.
/* set gain for xid returned from prior call */
gain = AUnityGain;
ASetGain(audio, xid, gain, &status);

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 the hardware manual that accompanies your system. 

AUTHOR

ASetGain() was developed by HP. 

SEE ALSO

AGetChannelGain(3X) AGetGain(3X), AGetSystemChannelGain(3X), AGMGainRestricted(3X), AInputChannels(3X), AInputSources(3X), AMaxInputGain(3X), AMaxOutputGain(3X), AMinInputGain(3X), AMinOutputGain(3X), AOutputChannels(3X), AOutputDestinations(3X), ASetChannelGain(3X), ASetSystemChannelGain(3X), ASimplePlayer(3X), ASimpleRecorder(3X). 

Using the Audio Application Program Interface.

Hewlett-Packard Company  —  HP-UX Release 9.03: April 1994