1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* $Id: merge_split.h,v 1.17 2010/02/05 23:50:22 simakov Exp $
*
* EPSILON - wavelet image compression library.
* Copyright (C) 2006,2007,2010 Alexander Simakov, <xander@entropyware.info>
*
* This file is part of EPSILON
*
* EPSILON is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* EPSILON 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with EPSILON. If not, see <http://www.gnu.org/licenses/>.
*
* http://epsilon-project.sourceforge.net
*/
/** \file
*
* \brief Merge and split
*
* The library expects that color image consists of 3 independent
* channels: Y, Cb and Cr. In order to provide smooth image scaling
* corresponding bitstreams should be merged into a singe bitstream.
* On decoding, the inverse operation should be taken. */
#ifndef __MERGE_SPLIT_H__
#define __MERGE_SPLIT_H__
#ifdef __cplusplus
extern "C" {
#endif
/** \addtogroup merge_split Merge and split */
/*@{*/
#include <common.h>
/** Merge two channels
*
* This function merges \a channel_A with \a channel_B. Result is stored
* in the \a channel_AB. Note that on return, combined \a channel_AB can
* be further merged with another channel.
*
* \param channel_A Channel A
* \param channel_B Channel B
* \param channel_AB Combined channel AB
* \param len_A Length of the \a channel_A
* \param len_B Length of the \a channel_B
*
* \note The caller should allocate at least \a len_A + \a len_B
* bytes for the \a channel_AB array.
*
* \return \c VOID */
void merge_channels(unsigned char *channel_A, unsigned char *channel_B,
unsigned char *channel_AB, int len_A, int len_B);
/** Split combined channel
*
* This function splits combined \a channel_AB into
* the \a channel_A and \a channel_B. It is important to note
* that \a channel_AB can be truncated at any position beforehand.
* In this case \a channel_A and \a channel_B will contain only
* part of original data. Real amount of saved bytes will be stored
* in the \a real_len_A and \a real_len_B respectively.
*
* \param channel_AB Combined channel AB
* \param channel_A Channel A
* \param channel_B Channel B
* \param len_AB Current length of the \a channel_AB
* \param len_A Original length of the \a channel_A
* \param len_B Original length of the \a channel_B
* \param real_len_A Number of bytes actually used in the \a channel_A
* \param real_len_B Number of bytes actually used in the \a channel_B
*
* \note The caller should allocate at least \a len_AB bytes for
* \a channel_A and \a channel_B arrays.
*
* \return \c VOID */
void split_channels(unsigned char *channel_AB,
unsigned char *channel_A, unsigned char *channel_B,
int len_AB, int len_A, int len_B,
int *real_len_A, int *real_len_B);
/*@}*/
#ifdef __cplusplus
}
#endif
#endif /* __MERGE_SPLIT_H__ */
|
