# Dirac - A Video Codec

Created by the British Broadcasting Corporation.

parseunit_byteio.h
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1 /* ***** BEGIN LICENSE BLOCK *****
2 *
3 * $Id: parseunit_byteio.h,v 1.11 2008/05/02 05:57:19 asuraparaju Exp $ $Name: Dirac_1_0_2 $
4 *
5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 *
7 * The contents of this file are subject to the Mozilla Public License
8 * Version 1.1 (the "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 * http://www.mozilla.org/MPL/
11 *
12 * Software distributed under the License is distributed on an "AS IS" basis,
13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
14 * the specific language governing rights and limitations under the License.
15 *
16 * The Original Code is BBC Research and Development code.
17 *
18 * The Initial Developer of the Original Code is the British Broadcasting
19 * Corporation.
20 * Portions created by the Initial Developer are Copyright (C) 2004.
21 * All Rights Reserved.
22 *
23 * Contributor(s): Andrew Kennedy (Original Author)
24 * Anuradha Suraparaju
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * the GNU General Public License Version 2 (the "GPL"), or the GNU Lesser
28 * Public License Version 2.1 (the "LGPL"), in which case the provisions of
29 * the GPL or the LGPL are applicable instead of those above. If you wish to
30 * allow use of your version of this file only under the terms of the either
31 * the GPL or LGPL and not to allow others to use your version of this file
32 * under the MPL, indicate your decision by deleting the provisions above
33 * and replace them with the notice and other provisions required by the GPL
34 * or LGPL. If you do not delete the provisions above, a recipient may use
35 * your version of this file under the terms of any one of the MPL, the GPL
36 * or the LGPL.
37 * ***** END LICENSE BLOCK ***** */
38
42 #ifndef parseunit_byteio_h
43 #define parseunit_byteio_h
44
45 //SYSTEM INLUDES
46 #include <map> // Byte-map
47 #include <string> // stores values
48
49 //LOCAL INCLUDES
50 #include "byteio.h" // Parent class
51
52
53 namespace dirac
54 {
55
56 /* Types of parse-unit */
57 typedef enum {
58 PU_SEQ_HEADER=0,
59 PU_PICTURE,
60 PU_END_OF_SEQUENCE,
61 PU_AUXILIARY_DATA,
62 PU_PADDING_DATA,
63 PU_CORE_PICTURE,
64 PU_LOW_DELAY_PICTURE,
65 PU_UNDEFINED
66 } ParseUnitType;
67
72 class ParseUnitByteIO : public ByteIO
73 {
74 public:
75
79 ParseUnitByteIO();
80
85 ParseUnitByteIO(const ByteIO& byte_io);
86
91 ParseUnitByteIO(const ParseUnitByteIO& parseunit_byteio);
92
96 ~ParseUnitByteIO();
97
102 virtual void CollateByteStats(DiracByteStats& dirac_byte_stats);
103
108 bool Input(); // decoding
109
113 bool IsValid();
114
119 bool CanSkip();
120
124 virtual const std::string GetBytes(); // encoding
125
130 void SetAdjacentParseUnits(ParseUnitByteIO *p_prev_parseunit); // encoding
131
132 /*
133 * Gets number of bytes input/output within unit
134 */
135 virtual int GetSize() const;
136
140 int GetNextParseOffset() const;
141
145 int GetPreviousParseOffset() const;
146
150 virtual ParseUnitType GetType() const;
151
155 bool IsSeqHeader() const
156 { return m_parse_code==0x00; }
157
161 bool IsEndOfSequence() const
162 { return m_parse_code==0x10; }
163
167 bool IsAuxiliaryData() const
168 { return (m_parse_code&0xF8)==0x20; }
169
173 bool IsPaddingData() const
174 { return m_parse_code==0x30; }
175
179 bool IsPicture() const
180 { return ((m_parse_code&0x08)==0x08); }
181
185 bool IsLowDelay() const
186 { return ((m_parse_code&0x88)==0x88); }
187
191 bool IsCoreSyntax() const
192 { return ((m_parse_code&0x88)==0x08); }
193
197 bool IsUsingAC() const
198 { return ((m_parse_code&0x48)==0x08); }
199
200 protected:
201
206 virtual int CalcNextUnitOffset();
207
212 virtual unsigned char CalcParseCode() const { return 0;} // encoding
213
218 bool SyncToUnitStart(); // decoding
219
223 unsigned char GetParseCode() const { return m_parse_code;}
224
225 private:
226
230 int m_previous_parse_offset;
231
235 int m_next_parse_offset;
236
240 unsigned char m_parse_code;
241
242 };
243
244
245 } // namespace dirac
246
247 #endif

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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