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livetrax/libs/appleutility/CoreAudio/AudioFile/AFPublic/DataSource.h

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C++

/*
File: DataSource.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
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Neither the name, trademarks, service marks or logos of Apple Inc. may
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
#ifndef __DataSource_h__
#define __DataSource_h__
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#include <AudioToolbox/AudioFile.h>
#else
#include <ConditionalMacros.h>
#include "AudioFile.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdexcept>
#include "CAAutoDisposer.h"
//////////////////////////////////////////////////////////////////////////////////////////
class DataSource
{
public:
DataSource(Boolean inCloseOnDelete);
virtual ~DataSource();
virtual OSStatus GetSize32(UInt32& outSize)
{
SInt64 size64;
OSStatus err = GetSize(size64);
if (err) return err;
if (size64 > 0x00000000FFFFffffLL) return kAudioFileDoesNotAllow64BitDataSizeError;
outSize = (UInt32)size64;
return noErr;
}
virtual OSStatus GetSize(SInt64& outSize) =0;
virtual OSStatus SetSize(SInt64 inSize)=0;
virtual OSStatus GetPos(SInt64& outPos) const=0;
/* non seekable data sources should use fsAtMark for the positionMode (or SEEK_CUR with offset zero,
or SEEK_SET with offset equal to the current position in the stream, in other words no seeking from the
current position is allowed.)
*/
virtual OSStatus ReadBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount)=0;
virtual OSStatus WriteBytes(UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
const void *buffer,
UInt32* actualCount)=0;
virtual void SetCloseOnDelete(Boolean inFlag) { mCloseOnDelete = inFlag; }
virtual Boolean CanSeek() const=0;
virtual Boolean CanGetSize() const=0;
virtual Boolean CanSetSize() const=0;
virtual Boolean CanRead() const=0;
virtual Boolean CanWrite() const=0;
protected:
Boolean mCloseOnDelete;
/* utility method */
SInt64 CalcOffset( UInt16 positionMode,
SInt64 positionOffset,
SInt64 currentOffset,
SInt64 size);
};
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
/*
Initialize with a Macintosh file fork ref num as obtained from FSOpenFork.
*/
#if 0
class MacFile_DataSource : public DataSource
{
FSIORefNum mFileNum;
SInt8 mPermissions;
public:
MacFile_DataSource( FSIORefNum inForkRefNum, SInt8 inPermissions, Boolean inCloseOnDelete);
virtual ~MacFile_DataSource();
virtual OSStatus GetSize(SInt64& outSize);
virtual OSStatus GetPos(SInt64& outPos) const;
virtual OSStatus SetSize(SInt64 inSize);
virtual OSStatus ReadBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount);
virtual OSStatus WriteBytes(UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
const void *buffer,
UInt32* actualCount);
virtual Boolean CanSeek() const { return true; }
virtual Boolean CanGetSize() const { return true; }
virtual Boolean CanSetSize() const { return true; }
virtual Boolean CanRead() const { return mPermissions & kAudioFileReadPermission; }
virtual Boolean CanWrite() const { return mPermissions & kAudioFileWritePermission; }
};
#endif
class UnixFile_DataSource : public DataSource
{
int mFileD;
SInt8 mPermissions;
UInt32 mNoCache;
SInt64 mCachedSize;
SInt64 mFilePointer;
public:
UnixFile_DataSource( int inFD, SInt8 inPermissions, Boolean inCloseOnDelete);
virtual ~UnixFile_DataSource();
virtual OSStatus GetSize(SInt64& outSize);
virtual OSStatus GetPos(SInt64& outPos) const;
virtual OSStatus SetSize(SInt64 inSize);
virtual OSStatus ReadBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount);
virtual OSStatus WriteBytes(UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
const void *buffer,
UInt32* actualCount);
virtual Boolean CanSeek() const { return true; }
virtual Boolean CanGetSize() const { return true; }
virtual Boolean CanSetSize() const { return true; }
virtual Boolean CanRead() const { return mPermissions & kAudioFileReadPermission; }
virtual Boolean CanWrite() const { return mPermissions & kAudioFileWritePermission; }
private:
SInt64 UFCurrentOffset (UInt16 positionMode,
SInt64 positionOffset);
};
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
/*
A wrapper that caches the wrapped source's header.
*/
class Cached_DataSource : public DataSource
{
DataSource* mDataSource;
CAAutoFree<UInt8> mHeaderCache;
UInt32 mHeaderCacheSize;
CAAutoFree<UInt8> mBodyCache;
UInt32 mBodyCacheSize;
UInt32 mBodyCacheCurSize;
SInt64 mBodyCacheOffset;
SInt64 mOffset;
Boolean mOwnDataSource;
public:
Cached_DataSource(DataSource* inDataSource, UInt32 inHeaderCacheSize = 4096, UInt32 inBodyCacheSize = 32768, Boolean inOwnDataSource = true)
: DataSource(false),
mDataSource(inDataSource), mHeaderCacheSize(inHeaderCacheSize),
mBodyCacheSize(inBodyCacheSize), mBodyCacheCurSize(0), mBodyCacheOffset(-1),
mOffset(0),
mOwnDataSource(inOwnDataSource)
{
}
virtual ~Cached_DataSource()
{
if (mOwnDataSource) delete mDataSource;
}
virtual OSStatus GetSize(SInt64& outSize) { return mDataSource->GetSize(outSize); }
virtual OSStatus GetPos(SInt64& outPos) const { return mDataSource->GetPos(outPos); }
virtual OSStatus SetSize(SInt64 inSize) { return mDataSource->SetSize(inSize); }
virtual OSStatus ReadBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount);
virtual OSStatus WriteBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
const void *buffer,
UInt32* actualCount);
OSStatus ReadFromHeaderCache( SInt64 offset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount);
virtual Boolean CanSeek() const { return mDataSource->CanSeek(); }
virtual Boolean CanGetSize() const { return mDataSource->CanGetSize(); }
virtual Boolean CanSetSize() const { return mDataSource->CanSetSize(); }
virtual Boolean CanRead() const { return mDataSource->CanRead(); }
virtual Boolean CanWrite() const { return mDataSource->CanWrite(); }
};
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
/* This class calls user supplied routines on demand. */
class Seekable_DataSource : public DataSource
{
void * mClientData;
SInt64 mOffset;
AudioFile_ReadProc mReadFunc;
AudioFile_WriteProc mWriteFunc;
AudioFile_GetSizeProc mSizeFunc;
AudioFile_SetSizeProc mSetSizeFunc;
public:
Seekable_DataSource( void * inClientData,
AudioFile_ReadProc inReadFunc,
AudioFile_WriteProc inWriteFunc,
AudioFile_GetSizeProc inGetSizeFunc,
AudioFile_SetSizeProc inSetSizeFunc
);
virtual ~Seekable_DataSource();
virtual OSStatus GetSize(SInt64& outSize);
virtual OSStatus GetPos(SInt64& outPos) const { outPos = mOffset; return noErr; };
virtual OSStatus SetSize(SInt64 inSize);
virtual OSStatus ReadBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount);
virtual OSStatus WriteBytes(UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
const void *buffer,
UInt32* actualCount);
virtual Boolean CanSeek() const { return true; }
virtual Boolean CanGetSize() const { return mSizeFunc != 0; }
virtual Boolean CanSetSize() const { return mSetSizeFunc != 0; }
virtual Boolean CanRead() const { return mReadFunc != 0; }
virtual Boolean CanWrite() const { return mWriteFunc != 0; }
};
//////////////////////////////////////////////////////////////////////////////////////////
class Buffer_DataSource : public DataSource
{
UInt32 mDataByteSize;
const char * mData;
SInt64 mStartOffset;
SInt64 mOffset;
public:
Buffer_DataSource( UInt32 inDataByteSize,
const void * inData,
SInt64 inStartOffset = 0
) : DataSource(false), mDataByteSize(inDataByteSize), mData((const char*)inData), mStartOffset(inStartOffset), mOffset(mStartOffset) {}
virtual ~Buffer_DataSource() {}
virtual OSStatus GetSize(SInt64& outSize) { outSize = mDataByteSize + mStartOffset; return noErr; }
virtual OSStatus GetPos(SInt64& outPos) const { outPos = mOffset; return noErr; };
virtual OSStatus SetSize(SInt64 inSize) { throw std::runtime_error("not writable"); }
virtual OSStatus ReadBytes( UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
void *buffer,
UInt32* actualCount);
virtual OSStatus WriteBytes(UInt16 positionMode,
SInt64 positionOffset,
UInt32 requestCount,
const void *buffer,
UInt32* actualCount) { throw std::runtime_error("not writable"); }
virtual Boolean CanSeek() const { return true; }
virtual Boolean CanGetSize() const { return true; }
virtual Boolean CanSetSize() const { return false; }
virtual Boolean CanRead() const { return true; }
virtual Boolean CanWrite() const { return false; }
};
//////////////////////////////////////////////////////////////////////////////////////////
#endif