ASetDefaultOutputs(3X)

NAME

ASetDefaultOutputs − selects the default output device used by the Audio control panel

SYNOPSIS

#include <Alib.h> void
ASetDefaultOutputs (

Audio ∗ audio,

AOutputDstMask outputDevMask,

long ∗ status_return );

DESCRIPTION

ASetDefaultOutputs() selects the default output device that will be used by the Audio control panel. The user is recommended to choose input and output devices via the Audio control panel. See Using the Audio Developer’s Kit for a description of the Audio control panel.

audio specifies the Audio structure associated with this connection.

outputDevMask specifies the output device to use (mask bit set to 1).

The mask is the bitwise inclusive OR of one or more of the mask values listed in the Structures section.

status_return receives the returned status of the operation, unless this parameter is passed in as a NULL pointer. If status_return is set to NULL, Alib will do the error handling.

STRUCTURES

The following is defined in /opt/audio/include/Alib.h.

typedef long                    AOutputDstMask;
#define AMonoIntSpeakerMask   ( 1 << AODTMonoIntSpeaker )
#define AMonoJackMask         ( 1 << AODTMonoJack )
#define ALeftIntSpeakerMask   ( 1 << AODTLeftIntSpeaker )
#define ARightIntSpeakerMask ( 1 << AODTRightIntSpeaker )
#define ALeftJackMask         ( 1 << AODTLeftJack )
#define ARightJackMask        ( 1 << AODTRightJack )
#define ADefaultOutputMask    ( 1 << AODTDefaultOutput )
#define AMonoLineOutMask      ( 1 << AODTMonoLineOut )
#define ALeftLineOutMask      ( 1 << AODTLeftLineOut )
#define ARightLineOutMask     ( 1 << AODTRightLineOut )
#define AMonoHeadphoneMask    ( 1 << AODTMonoHeadphone )
#define ALeftHeadphoneMask    ( 1 << AODTLeftHeadphone )
#define ARightHeadphoneMask   ( 1 << AODTRightHeadphone )

ERRORS

If status_return is not set to NULL, it can return one of the following values:

0 AENoError No error - the call completed successfully.

2 AEBadAudio The audio structure is invalid. A pointer to a valid audio structure may be missing (use AOpenAudio() to get a valid pointer).

3 AEBadValue Either the Aserver is old and does not support Default inputs and ouputs, or you supplied an incorrect value (such as trying to set the default output to the default input).

NOTE

This routine is not meant for normal use by audio application programs. This call and ASetDefaultInput() are intended for use by the Audio control panel. The calls set the input/output device immediately, regardless of what application is using them. Typically, input/output devices are specified at the beginning of a transaction in the gain matrix.

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

ASetDefaultOutputs() was developed by HP.

Museum

Related Articles