New Sound Manager APIs

SoundManagerGetInfo

pascal OSErr
SoundManagerGetInfo(OSType selector, void* infoPtr);

This routine retrieves global information about the Sound Manaager.

Defined selectors:

siSupportedExtendedFlags

Retrieves which flags are supported in Extended sound data structures in an unsigned long.

SoundManagerSetInfo

pascal OSErr
SoundManagerSetInfo(OSType selector, void* infoPtr);

This routine sets global information about the Sound Manager.

Defined selectors: none

SoundConverterFillBuffer

Provides an alternative method for converting data using the Sound Converter, which is both more predictable and more flexible than the SoundConverterConvertBuffer mechanism. The SoundConverterFillBuffer function can return any Sound Manager error.

pascal OSErr    SoundConverterFillBuffer( SoundConverter sc,
                     SoundConverterFillBufferDataUPP  fillBufferDataUPP,
                     void* fillBufferDataRefCon,
                     void* outputBuffer,
                     unsigned long outputBufferByteSize,
                     unsigned long* bytesWritten,
                     unsigned long* framesWritten,
                     unsigned long* outputFlags
                     )

sc

The Sound Converter context to work with (created with SoundConverterOpen).

fillBufferDataUPP

A UPP that points to a routine that can provide data to the Sound Converter.

fillBufferDataRefCon

This value is passed to the SoundConverterFillBufferDataUPP. It can be used for any purpose the client wishes.

outputBuffer

The buffer to write the data into.

outputBufferByteSize

The size of outputBuffer in bytes. No more than this amount will ever be written during a single call to SoundConverterFillBuffer.

bytesWritten

Upon completion, the number of bytes that were written into outBuffer.

framesWritten

Upon completion, the number of sample frames written into outBuffer.

outputFlags

 

Upon completion, a set of bit flags that indicate the state of the conversion. These are the currently defined flags:

kSoundConverterDidntFillBuffer

Set if the converter didn't completely fill the output buffer.

kSoundConverterHasLeftOverData

Set if the converter still has more data to deliver. This indicates that more calls to SoundConvertFillBuffer should be made to complete the conversion. A caveat: If this flag is not set, it doesn't indicate there is necessarily more data in the pipeline. These are advisor flags only: they don't guarantee any internal data. You need to keep track of your data.