/*

    File:       RTPMPIMAAudio.h

    Contains:   Declarations for IMA Audio RTPMediaPacketizer

    Copyright:  © 1997-1999 by Apple Computer, Inc., all rights reserved.

*/

#ifndef __RTPMPCOMPONENTVIDEO__

#define __RTPMPCOMPONENTVIDEO__

#pragma once

/* ---------------------------------------------------------------------------

 *      H E A D E R S

 * ---------------------------------------------------------------------------

 */

#include <QTStreamingComponents.h>

#include "IMAAudioRTP.h"

#include "IMAAudioQueue.h"

/* ---------------------------------------------------------------------------

 *      D A T A T Y P E S

 * ---------------------------------------------------------------------------

 *

 *  An RTPMPIMAAudioInstanceData structure stores instance variables for

 *  an IMA Audio RTPMediaPacketizer instance.  The structure declares the

 *  following fields:

 *  

 *      itself                      the RTPMediaPacketizer instance that

 *                                  maintains this data structure

 *      

 *      itsBase                     the RTPMediaPacketizer to which the

 *                                  instance delegates calls

 *      

 *      itsFinalDerivation          the RTPMediaPacketizer instance to which

 *                                  the instance targets calls to itself

 *      

 *      itsInSystemHeap             true when this data structure resides in

 *                                  the system heap

 *      

 *      itsLockCount                count of execution contexts requiring that

 *                                  the instance data remain non-relocatable

 *      

 *      itsInitialized              true when the instance has initialized the

 *                                  remaining fields

 *      

 *      itsExpectedTimestamp        on entry to the RTPMPSetSamplData()

 *                                  implementation, this field should match

 *                                  the timeStamp field of the

 *                                  RTPMPSampleDataParams parameter

 *

 *      itsPayloadAttributesInitialized

 *                                  true when itsPayloadAttributes has been

 *                                  initialized from a sample description

 *

 *      itsPayloadAttributes        precomputed values for header the instance

 *                                  includes with each payload

 *

 *      itsSampleDescriptionSeed    the seed of the SampleDescription the

 *                                  instance is using for sample data

 *      

 *      itsAudioQueue               audio data awaiting packetization

 *

 *      itsPacketBuilder            the RTPMPPacketBuilder the instance uses

 *                                  to contruct network packets

 *      

 *      itsMediaTimeScale           the TimeScale of the source sample data

 *      

 *      itsMediaTimeBase            the TimeBase passed to RTPMPSetTimeBase()

 *      

 *      itsPayloadSizeLimit         the maximum allowable size, in octets, of

 *                                  payloads the instance may contruct

 *      

 *      itsPayloadDurationLimit     the maximum allowable duration of sample

 *                                  data the instance may encapsulate in a

 *                                  single payload

 *      

 *      itsInterleaveGroupFrameCount

 *                                  number of frames of sample data to

 *                                  encapsulate in a single interleave group

 *      

 */

typedef struct

{

    RTPMediaPacketizer  itself;

    RTPMediaPacketizer  itsBase;

    RTPMediaPacketizer  itsFinalDerivation;

    Boolean             itsInSystemHeap;

    UInt32              itsLockCount;

    Boolean             itsInitialized;

    UInt32              itsExpectedTimestamp;

    Boolean             itsPayloadAttributesInitialized;

    IMAAudioPayload     itsPayloadAttributes;

    UInt32              itsSampleDescriptionSeed;

    IMAAudioQueue       itsAudioQueue;

    RTPPacketBuilder    itsPacketBuilder;

    TimeScale           itsMediaTimeScale;

    TimeBase            itsMediaTimeBase;

    UInt32              itsPayloadSizeLimit;

    UInt32              itsPayloadDurationLimit;

    UInt32              itsInterleaveGroupFrameCount;

} RTPMPIMAAudioInstanceData;

#endif /* __RTPMPCOMPONENTVIDEO__ */