114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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//
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// QTFile_FileControlBlock:
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// All the per-client stuff for QTFile.
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#ifndef _QTFILE_FILECONTROLBLOCK_H_
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#define _QTFILE_FILECONTROLBLOCK_H_
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//
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// Includes
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#include "OSHeaders.h"
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#include "OSFileSource.h"
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#if DSS_USE_API_CALLBACKS
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#include "QTSS.h"
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#endif
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#if DSS_USE_API_CALLBACKS
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#define FILE_SOURCE QTSS_Object
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#else
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#define FILE_SOURCE OSFileSource
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#endif
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//
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// Class state cookie
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class QTFile_FileControlBlock {
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public:
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//
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// Constructor and destructor.
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QTFile_FileControlBlock(void);
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virtual ~QTFile_FileControlBlock(void);
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//Sets this object to reference this file
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void Set(char *inPath);
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//Advise: this advises the OS that we are going to be reading soon from the
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//following position in the file
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// void Advise(OSFileSource *dflt, UInt64 advisePos, UInt32 adviseAmt);
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Bool16 Read(FILE_SOURCE *dflt, UInt64 inPosition, void* inBuffer, UInt32 inLength);
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Bool16 ReadInternal(FILE_SOURCE *dataFD, UInt64 inPosition, void* inBuffer, UInt32 inLength, UInt32 *inReadLenPtr = NULL);
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//
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// Buffer management functions
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void AdjustDataBufferBitRate(UInt32 inUnitSizeInK = 32, UInt32 inFileBitRate = 32768, UInt32 inNumBuffSizeUnits = 0, UInt32 inMaxBitRateBuffSizeInBlocks = 8);
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void AdjustDataBuffers(UInt32 inBlockSizeKBits = 32, UInt32 inBlockCountPerBuff = 1);
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void EnableCacheBuffers(Bool16 enabled) {fCacheEnabled = enabled;}
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// QTSS_ErrorCode Close();
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Bool16 IsValid()
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{
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#if DSS_USE_API_CALLBACKS
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return fDataFD != NULL;
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#else
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return fDataFD.IsValid();
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#endif
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}
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private:
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//
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// File descriptor for this control block
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FILE_SOURCE fDataFD;
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enum
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{
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kMaxDefaultBlocks = 8,
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kDataBufferUnitSizeExp = 15, // 32Kbytes
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kBlockByteSize = ( 1 << kDataBufferUnitSizeExp)
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};
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//
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// Data buffer cache
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char *fDataBufferPool;
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UInt32 fDataBufferSize;
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UInt64 fDataBufferPosStart, fDataBufferPosEnd;
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char *fCurrentDataBuffer, *fPreviousDataBuffer;
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UInt32 fCurrentDataBufferLength, fPreviousDataBufferLength;
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UInt32 fNumBlocksPerBuff;
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UInt32 fNumBuffs;
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Bool16 fCacheEnabled;
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};
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#endif //_QTFILE_FILECONTROLBLOCK_H_
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