NAME

ACalculateLength − return the size in bytes of converted data

SYNOPSIS

#include <Alib.h> long
ACalculateLength (

Audio ∗  audio,

long buffer1_size,

AudioAttributes ∗  buffer1_attributes,

AudioAttributes ∗  buffer2_attributes,

long ∗  status_return );

DESCRIPTION

This routine helps an application program determine the buffer size required when conversion is necessary on an audio stream. 

audio specifies the Audio structure associated with this connection. 

buffer1_size specifies the length in bytes of the data in buffer 1. 

buffer1_attributes specifies the attributes of the data in buffer 1 (must be fully specified). 

buffer2_attributes specifes the attributes of the data in buffer2. 

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. 

RETURN VALUE

Upon successful completion, ACalculateLength() returns the size in bytes that the data in buffer 1 would be if it were converted to have the attributes specified by buffer2_attributes.

ERRORS

If status_return is not set to NULL, it can return the following value:

0  AENoError No error - the call completed successfully. 

NOTE

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

ACalculate Length() was developed by HP. 

SEE ALSO

AConvertBuffer(3X). 

Hewlett-Packard Company  —  Audio Library: February, 1995