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|
/*****************************************************************
|
| AP4 - ByteStream Interface
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
#ifndef _AP4_BYTE_STREAM_H_
#define _AP4_BYTE_STREAM_H_
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Types.h"
#include "Ap4Interfaces.h"
#include "Ap4Results.h"
#include "Ap4DataBuffer.h"
/*----------------------------------------------------------------------
| class references
+---------------------------------------------------------------------*/
class AP4_String;
class AP4_ByteStream;
class AP4_ByteStreamObserver
{
public:
virtual AP4_Result OnFlush(AP4_ByteStream *stream) = 0;
};
/*----------------------------------------------------------------------
| AP4_ByteStream
+---------------------------------------------------------------------*/
class AP4_ByteStream : public AP4_Referenceable
{
public:
AP4_ByteStream() :observer_(0){};
void SetObserver(AP4_ByteStreamObserver *observer){ observer_ = observer; };
AP4_ByteStreamObserver *GetObserver(){ return observer_; };
// methods
virtual AP4_Result ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read) = 0;
AP4_Result Read(void* buffer, AP4_Size bytes_to_read);
AP4_Result ReadDouble(double& value);
AP4_Result ReadUI64(AP4_UI64& value);
AP4_Result ReadUI32(AP4_UI32& value);
AP4_Result ReadUI24(AP4_UI32& value);
AP4_Result ReadUI16(AP4_UI16& value);
AP4_Result ReadUI08(AP4_UI08& value);
AP4_Result ReadString(char* buffer, AP4_Size size);
AP4_Result ReadNullTerminatedString(AP4_String& string);
virtual AP4_Result WritePartial(const void* buffer,
AP4_Size bytes_to_write,
AP4_Size& bytes_written) = 0;
AP4_Result Write(const void* buffer, AP4_Size bytes_to_write);
AP4_Result WriteString(const char* string_buffer);
AP4_Result WriteDouble(double value);
AP4_Result WriteUI64(AP4_UI64 value);
AP4_Result WriteUI32(AP4_UI32 value);
AP4_Result WriteUI24(AP4_UI32 value);
AP4_Result WriteUI16(AP4_UI16 value);
AP4_Result WriteUI08(AP4_UI08 value);
virtual AP4_Result Seek(AP4_Position position) = 0;
virtual AP4_Result Tell(AP4_Position& position) = 0;
virtual AP4_Result GetSize(AP4_LargeSize& size) = 0;
virtual AP4_Result CopyTo(AP4_ByteStream& stream, AP4_LargeSize size);
virtual AP4_Result Buffer() { return AP4_SUCCESS; }
virtual AP4_Result Flush() { return AP4_SUCCESS; }
private:
AP4_ByteStreamObserver *observer_;
};
/*----------------------------------------------------------------------
| AP4_SubStream
+---------------------------------------------------------------------*/
class AP4_SubStream : public AP4_ByteStream
{
public:
AP4_SubStream(AP4_ByteStream& container,
AP4_Position position,
AP4_LargeSize size);
// AP4_ByteStream methods
AP4_Result ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read);
AP4_Result WritePartial(const void* buffer,
AP4_Size bytes_to_write,
AP4_Size& bytes_written);
AP4_Result Seek(AP4_Position position);
AP4_Result Tell(AP4_Position& position) {
position = m_Position;
return AP4_SUCCESS;
}
AP4_Result GetSize(AP4_LargeSize& size) {
size = m_Size;
return AP4_SUCCESS;
}
// AP4_Referenceable methods
void AddReference();
void Release();
protected:
virtual ~AP4_SubStream();
private:
AP4_ByteStream& m_Container;
AP4_Position m_Offset;
AP4_LargeSize m_Size;
AP4_Position m_Position;
AP4_Cardinal m_ReferenceCount;
};
/*----------------------------------------------------------------------
| AP4_DupStream
+---------------------------------------------------------------------*/
class AP4_DupStream : public AP4_ByteStream
{
public:
AP4_DupStream(AP4_ByteStream& original_stream);
// AP4_ByteStream methods
AP4_Result ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read);
AP4_Result WritePartial(const void* buffer,
AP4_Size bytes_to_write,
AP4_Size& bytes_written);
AP4_Result Seek(AP4_Position position);
AP4_Result Tell(AP4_Position& position) {
position = m_Position;
return AP4_SUCCESS;
}
AP4_Result GetSize(AP4_LargeSize& size) {
return m_OriginalStream.GetSize(size);
}
// AP4_Referenceable methods
void AddReference();
void Release();
protected:
virtual ~AP4_DupStream();
private:
AP4_ByteStream& m_OriginalStream;
AP4_Position m_Position;
AP4_Cardinal m_ReferenceCount;
};
/*----------------------------------------------------------------------
| AP4_MemoryByteStream
+---------------------------------------------------------------------*/
class AP4_MemoryByteStream : public AP4_ByteStream
{
public:
AP4_MemoryByteStream(AP4_Size size = 0); // filled with zeros
AP4_MemoryByteStream(const AP4_UI08* buffer, AP4_Size size);
AP4_MemoryByteStream(AP4_DataBuffer& data_buffer); // data is read/written from/to supplied buffer, no ownership transfer
AP4_MemoryByteStream(AP4_DataBuffer* data_buffer); // data is read/written from/to supplied buffer, ownership is transfered
// AP4_ByteStream methods
AP4_Result ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read);
AP4_Result WritePartial(const void* buffer,
AP4_Size bytes_to_write,
AP4_Size& bytes_written);
AP4_Result Seek(AP4_Position position);
AP4_Result Tell(AP4_Position& position) {
position = m_Position;
return AP4_SUCCESS;
}
AP4_Result GetSize(AP4_LargeSize& size) {
size = m_Buffer->GetDataSize();
return AP4_SUCCESS;
}
// AP4_Referenceable methods
void AddReference();
void Release();
// methods
const AP4_UI08* GetData() { return m_Buffer->GetData(); }
AP4_UI08* UseData() { return m_Buffer->UseData(); }
AP4_Size GetDataSize() { return m_Buffer->GetDataSize(); }
//protected:
virtual ~AP4_MemoryByteStream();
private:
AP4_DataBuffer* m_Buffer;
bool m_BufferIsLocal;
AP4_Position m_Position;
AP4_Cardinal m_ReferenceCount;
};
/*----------------------------------------------------------------------
| AP4_BufferedInputStream
+---------------------------------------------------------------------*/
class AP4_BufferedInputStream : public AP4_ByteStream
{
public:
AP4_BufferedInputStream(AP4_ByteStream& source,
AP4_Size buffer_size=4096,
AP4_Size seek_as_read_threshold=1024*128);
// AP4_ByteStream methods
AP4_Result ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read);
AP4_Result WritePartial(const void* buffer,
AP4_Size bytes_to_write,
AP4_Size& bytes_written);
AP4_Result Seek(AP4_Position position);
AP4_Result Tell(AP4_Position& position);
AP4_Result GetSize(AP4_LargeSize& size) { return m_Source.GetSize(size); }
// AP4_Referenceable methods
void AddReference();
void Release();
protected:
~AP4_BufferedInputStream() { m_Source.Release(); }
AP4_Result Refill();
private:
AP4_DataBuffer m_Buffer;
AP4_Size m_BufferPosition;
AP4_ByteStream& m_Source;
AP4_Position m_SourcePosition;
AP4_Size m_SeekAsReadThreshold;
AP4_Cardinal m_ReferenceCount;
};
#endif // _AP4_BYTE_STREAM_H_
|
