Dirac - A Video Codec

Created by the British Broadcasting Corporation.


dirac_cppparser.h
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38 
39 
40 
41 #ifndef DIRAC_CPPPARSER_H
42 #define DIRAC_CPPPARSER_H
43 
44 #include <istream>
45 #include <streambuf>
46 #include <libdirac_decoder/decoder_types.h> //for DecoderState
47 #include <libdirac_common/common.h>
49 
50 namespace dirac
51 {
52  class SequenceDecompressor;
53  class Picture;
54 
56  class InputStreamBuffer : public std::streambuf
57  {
58  public:
61 
64 
66  std::ios::pos_type Rewind();
67 
69 
74  std::ios::pos_type Seek(std::ios::pos_type bytes,
75  std::ios::seekdir pos = std::ios::cur);
76 
78  std::ios::pos_type Tell();
79 
81 
86  void Copy(char *start, int bytes);
87 
89  void PurgeProcessedData();
90 
91  private:
92 
94  InputStreamBuffer (const InputStreamBuffer& inbuf);
95 
98 
100  static const int m_buffer_size = 1232896;
101 
104  };
105 
107 
120  {
121  public:
123 
127  DiracParser(bool verbose = false );
128 
130  ~DiracParser();
131 
133 
137  void SetBuffer (char *start, char *end);
138 
140 
150 
152  const ParseParams& GetParseParams() const;
153 
155  const SourceParams& GetSourceParams() const;
156 
158  const PictureParams* GetNextPictureParams() const;
159 
161  const Picture* GetNextPicture() const;
162 
164  const DecoderParams& GetDecoderParams() const;
165 
166  private:
167 
168  private:
169 
171  DiracParser (const DiracParser &dp);
173  DiracParser& operator = (const DiracParser &dp);
183  bool m_verbose;
186  };
187 
188 } // namespace dirac
189 
190 #endif
InputStreamBuffer & operator=(const InputStreamBuffer &inbuf)
Private body-less assignment operator.
std::ios::pos_type Tell()
Return the current read position in the buffer.
void SetBuffer(char *start, char *end)
Adds bytes to encoder.
Parameters relating to the source material being encoded/decoded.
Definition: common.h:288
Input Stream Buffer Class.
Definition: dirac_cppparser.h:56
SequenceDecompressor * m_decomp
Sequence decompressor object.
Definition: dirac_cppparser.h:181
const DecoderParams & GetDecoderParams() const
Return the coding parameters of the current sequence.
int m_show_pnum
picture number of last picture decoded in display order
Definition: dirac_cppparser.h:179
char * m_chunk_buffer
Buffere.
Definition: dirac_cppparser.h:103
Represents a series of bytes in the Dirac bytestream specfication format.
Definition: dirac_byte_stream.h:60
DecoderState Parse()
Parse the data in internal buffer.
const SourceParams & GetSourceParams() const
Return the source parameters of the current sequence.
void PurgeProcessedData()
Delete all processed data from buffer.
DecoderState m_state
Current state of parser.
Definition: dirac_cppparser.h:175
DecoderState m_next_state
Next state the parser will enter.
Definition: dirac_cppparser.h:177
const Picture * GetNextPicture() const
Return the decoded picture.
bool m_verbose
verbose flag
Definition: dirac_cppparser.h:183
Parameters for initialising picture class objects.
Definition: common.h:532
DiracParser(bool verbose=false)
Constructor.
Parameters for the decoding process.
Definition: common.h:1548
DiracByteStream m_dirac_byte_stream
Byte Stream Buffer.
Definition: dirac_cppparser.h:185
InputStreamBuffer()
Constructor.
DiracParser & operator=(const DiracParser &dp)
private body-less assignement constructor
DecoderState
Definition: decoder_types.h:49
Dirac Stream Parser Class.
Definition: dirac_cppparser.h:119
const ParseParams & GetParseParams() const
Return the parse parameters of the current sequence.
~DiracParser()
Destructor.
Definition of class SequenceHeaderByteIO.
Definition: accessunit_byteio.h:51
~InputStreamBuffer()
Destructor.
void Copy(char *start, int bytes)
Copy data into buffer.
static const int m_buffer_size
Buffer size.
Definition: dirac_cppparser.h:100
std::ios::pos_type Seek(std::ios::pos_type bytes, std::ios::seekdir pos=std::ios::cur)
Seek to position specified by bytes offset from pos.
Decompresses a sequence of pictures from a stream.
Definition: seq_decompress.h:65
const PictureParams * GetNextPictureParams() const
Return the picture parameters of the next picture to be decoded.
std::ios::pos_type Rewind()
Rewind buffer to start of data.
Parameters relating to the complexity of encoder/decoder.
Definition: common.h:890
A class for encapsulating all the data relating to a picture.
Definition: picture.h:51

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