# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

seq_decompress.h
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40
41
42#ifndef _SEQ_DECOMPRESS_H_
43#define _SEQ_DECOMPRESS_H_
44
46//---------------------------------------//
47//Class to manage decompressing sequences//
48//---------------------------------------//
50
51#include "libdirac_common/common.h"
52#include "libdirac_byteio/parseunit_byteio.h"
53#include <iostream>
54
55 namespace dirac
56{
57 class PictureBuffer;
58 class Picture;
59 class PictureDecompressor;
60
62
65 class SequenceDecompressor{
66 public:
67
69
75 SequenceDecompressor(ParseUnitByteIO& parseunit, bool verbosity);
76
78
81 ~SequenceDecompressor();
82
84
87 void NewAccessUnit(ParseUnitByteIO& parseunit_byteio);
88
89
91
105 const Picture* DecompressNextPicture(ParseUnitByteIO* p_parseunit_byteio);
106
108 const Picture* GetNextPicture();
109
111 const PictureParams* GetNextPictureParams() const;
113
118 bool Finished();
120
125 ParseParams & GetParseParams() { return m_parse_params; }
126
127
129
134 SourceParams & GetSourceParams() { return m_srcparams; }
135
136
138
143 DecoderParams & GetDecoderParams() { return m_decparams; }
144 private:
146
151 SequenceDecompressor(const SequenceDecompressor& cpy);
152
154
159 SequenceDecompressor& operator=(const SequenceDecompressor& rhs);
160
161
162 //Member variables
163
165 bool m_all_done;
167 DecoderParams m_decparams;
169 ParseParams m_parse_params;
171 SourceParams m_srcparams;
173 PictureBuffer* m_pbuffer;
175 int m_current_code_pnum;
177 int m_delay;
179 int m_last_picture_read;
181 int m_show_pnum;
183 PictureDecompressor *m_pdecoder;
185 int m_highest_pnum;
186 };
187
188} // namespace dirac
189
190#endif
parseunit_byteio.h
common.h
dirac
Definition of class SequenceHeaderByteIO.
Definition: accessunit_byteio.h:52
dirac::ParseUnitByteIO
Represents a collection of data in a Dirac bytestream that can be parsed as a self-contained unit.
Definition: parseunit_byteio.h:73
dirac::SourceParams
Parameters relating to the source material being encoded/decoded.
Definition: common.h:289
dirac::PictureParams
Parameters for initialising picture class objects.
Definition: common.h:533
dirac::ParseParams
Parameters relating to the complexity of encoder/decoder.
Definition: common.h:891
dirac::DecoderParams
Parameters for the decoding process.
Definition: common.h:1549
dirac::Picture
A class for encapsulating all the data relating to a picture.
Definition: picture.h:52
dirac::PictureBuffer
Holds pictures both for reference and to overcome reordering delay.
Definition: picture_buffer.h:59
dirac::PictureDecompressor
Compress a single image picture.
Definition: picture_decompress.h:61
dirac::SequenceDecompressor
Decompresses a sequence of pictures from a stream.
Definition: seq_decompress.h:65
dirac::SequenceDecompressor::m_pdecoder
PictureDecompressor * m_pdecoder
Picture decompressor object.
Definition: seq_decompress.h:183
dirac::SequenceDecompressor::GetSourceParams
SourceParams & GetSourceParams()
Interrogates for source parameters.
Definition: seq_decompress.h:134
dirac::SequenceDecompressor::GetNextPictureParams
const PictureParams * GetNextPictureParams() const
Get the next picture parameters.
dirac::SequenceDecompressor::GetParseParams
ParseParams & GetParseParams()
Interrogates for parse parameters.
Definition: seq_decompress.h:125
dirac::SequenceDecompressor::m_srcparams
SourceParams m_srcparams
The source parameters obtained from the stream header.
Definition: seq_decompress.h:171
dirac::SequenceDecompressor::m_delay
int m_delay
A delay so that we don't display what we haven't decoded.
Definition: seq_decompress.h:177
dirac::SequenceDecompressor::m_pbuffer
PictureBuffer * m_pbuffer
A picture buffer used for local storage of pictures whilst pending re-ordering or being used for refe...
Definition: seq_decompress.h:173
dirac::SequenceDecompressor::m_highest_pnum
int m_highest_pnum
Highest picture-num processed - for tracking end-of-sequence.
Definition: seq_decompress.h:185
dirac::SequenceDecompressor::m_all_done
bool m_all_done
Completion flag, returned via the Finished method.
Definition: seq_decompress.h:165
dirac::SequenceDecompressor::GetDecoderParams
DecoderParams & GetDecoderParams()
Interrogates for coding parameters.
Definition: seq_decompress.h:143
dirac::SequenceDecompressor::~SequenceDecompressor
~SequenceDecompressor()
Destructor.
dirac::SequenceDecompressor::m_decparams
DecoderParams m_decparams
Parameters for the decompression, as provided in constructor.
Definition: seq_decompress.h:167
dirac::SequenceDecompressor::m_show_pnum
int m_show_pnum
Index, in display order of the picture to be displayed next - computed from delay and current_code_pn...
Definition: seq_decompress.h:181
dirac::SequenceDecompressor::SequenceDecompressor
SequenceDecompressor(const SequenceDecompressor &cpy)
Copy constructor is private and body-less.
dirac::SequenceDecompressor::Finished
bool Finished()
Determine if decompression is complete.
dirac::SequenceDecompressor::m_last_picture_read
int m_last_picture_read
Index, in display order, of the last picture read.
Definition: seq_decompress.h:179
dirac::SequenceDecompressor::m_parse_params
ParseParams m_parse_params
The parse parameters obtained from the stream header.
Definition: seq_decompress.h:169
dirac::SequenceDecompressor::DecompressNextPicture
const Picture * DecompressNextPicture(ParseUnitByteIO *p_parseunit_byteio)
Decompress the next picture in sequence.
dirac::SequenceDecompressor::NewAccessUnit
void NewAccessUnit(ParseUnitByteIO &parseunit_byteio)
Marks beginning of a new AccessUnit.
dirac::SequenceDecompressor::m_current_code_pnum
int m_current_code_pnum
Number of the picture in coded order which is to be decoded.
Definition: seq_decompress.h:175
dirac::SequenceDecompressor::GetNextPicture
const Picture * GetNextPicture()
Get the next picture available for display.
dirac::SequenceDecompressor::operator=
SequenceDecompressor & operator=(const SequenceDecompressor &rhs)
Assignment = is private and body-less.
dirac::SequenceDecompressor::SequenceDecompressor
SequenceDecompressor(ParseUnitByteIO &parseunit, bool verbosity)
Constructor.

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