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BufferedMPGStreamReader.hpp

00001 /***********************************************************************
00002  *                                                                      *
00003  * ViTooKi                                                              *
00004  *                                                                      *
00005  * title: BufferedMPGStreamReader.hpp                                   *
00006  *                                                                      *
00007  *                                                                      *
00008  *                                                                      *
00009  * ITEC institute of the University of Klagenfurt (Austria)             *
00010  * http://www.itec.uni-klu.ac.at                                        *
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00017  *                                                                      *
00018  * This file is part of ViTooKi, a free video toolkit.                  *
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00035 
00036 /***********************************************************************
00037  *                                                                      *
00038  *  REVISION HISTORY:                                                   *
00039  *                                                                      *
00040  *                                                                      *
00041  *                                                                      *
00042  ***********************************************************************/
00043 
00044 #ifndef _PS_BUFFEREDMPGSTREAMREADER_HPP_
00045 #define _PS_BUFFEREDMPGSTREAMREADER_HPP_
00046 
00047 #include "MPGStreamIO.hpp"
00048 #include "global.hpp"
00049 class ESInfo;
00050 class Frame;
00051 class QIODevice;
00052 
00053 #define SAFETYDIST 4
00054 #define STREAMREADER_DEF_BUFFER_SIZE 4096
00055 
00062 class BufferedMPGStreamReader:public MPGStreamIO {
00063 public:
00064 
00065         BufferedMPGStreamReader(ESInfo * es, const char *file, bool writeOnly, bool omitHeader = false, 
00066                                                                                                         int bufferSize =  STREAMREADER_DEF_BUFFER_SIZE, int maxFrameSize = MAX_FRAME_SIZE);
00067 
00068         virtual ~BufferedMPGStreamReader();
00069 
00070         bool testFileopen();
00071 
00072         Frame *getFrame();
00073 
00074         static int getDefaultBufferSize() { return STREAMREADER_DEF_BUFFER_SIZE; }; //assume one kernel page for efficient reading
00075 
00076 
00077 private:
00078 
00079         bool readBuffer();
00080         int buffered_getc();
00081         void goBack(int nrBytes);
00082         int buffered_read(u8 *buf, int nrBytes);
00083         int buffered_copy(u8 *buf, int nrBytes);
00084         void initBuffer();
00085 
00086         u8 *buffer;
00087         int bufferSize;
00088         int bytesBuffered, lastBytesBuffered;
00089         int bytesRead;
00090         int bytesReadTotal;
00091         bool bufferAtEnd;
00092 
00093         int maxFrameSize;
00094         int DTS;
00095 };
00096 
00097 #endif