NAME

ASetChannelGain − set transaction channel gain

SYNOPSIS

#include <audio/Alib.h>

void ASetSystemChannelGain(

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

);

DESCRIPTION

ASetChannelGain() sets the transaction gain to the value in gain.

audio Audio structure associated with this connection. 

xid Transaction ID. 

channel Type of channel: ACTMono, ACTLeft, or ACTRight. 

gain Specifies the volume: AUnityGain, AZeroGain, or a number of decibels. 

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

3 AEBadValue

EXAMPLES

The following example sets the transaction right channel gain to −6. 

Audio *audio;         /* audio connection */
AChType *chtype;      /* type of channel */
AGainDB chgain;       /* gain specification*/
long status;          /* error status */
.
.
.
/* set xid right channel gain to -6 */
chtype = ACTRight
chgain = -6;
ASetChannelGain(audio, xid, chtype, chgain, &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

ASetChannelGain() 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), ASetGain(3X), ASetSystemChannelGain(3X), ASimplePlayer(3X), ASimpleRecorder(3X). 

Using the Audio Application Program Interface.

Hewlett-Packard Company  —  HP-UX Release 9.0: August 1992