1 /*
2 * crdef.cc --
3 *
4 * Conditional Replenisher object source code
5 *
6 * Copyright (c) 1997-2002 The Regents of the University of California.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * A. Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 * B. Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * C. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
22 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #ifndef lint
35 static const char rcsid[] =
36 "@(#) $Header: /usr/mash/src/repository/mash/mash-1/codec/crdef.cc,v 1.11 2002/02/03 03:13:32 lim Exp $";
37 #endif
38
39 #include "crdef.h"
40
41 ConditionalReplenisher::ConditionalReplenisher()
42 :frmno_(0), crvec_(0), rover_(0)
43 {
44 /*FIXME*/
45 idle_low_ = 2;
46 idle_high_ = 2;
47 }
48
49 ConditionalReplenisher::~ConditionalReplenisher()
50 {
51 delete[] crvec_;
52 }
53
54 #define NLEVEL 4
55 int levelMap[] = { 0, 2, 1, 2}; /*FIXME needs to be parameterizable from tcl*/
56
57 int ConditionalReplenisher::get_level()
58 {
59 /*FIXME this needs to be parameterizable from tcl*/
60 return (frmno_ & (NLEVEL - 1));
61 }
62
63 void ConditionalReplenisher::crinit(int w, int h)
64 {
65 blkw_ = w >> 4;
66 blkh_ = h >> 4;
67 scan_ = 0;
68 nblk_ = blkw_ * blkh_;
69 delete[] crvec_;
70 crvec_ = new u_char[nblk_];
71 send_all();
72 }
73
74
75 void ConditionalReplenisher::mark_all_send()
76 {
77 if (crvec_ != 0) {
78 for (int i = 0; i < nblk_; ++i)
79 crvec_[i] = CR_SEND;
80 }
81 }
82
83
84 void ConditionalReplenisher::send_all()
85 {
86 if (crvec_ != 0) {
87 for (int i = 0; i < nblk_; ++i)
88 crvec_[i] = CR_MOTION_BIT|CR_LQ;
89 }
90 }
91
92 int ConditionalReplenisher::age_blocks()
93 {
94 ++frmno_;
95 int level = get_level();
96 int hlev = levelMap[level];
97
98 for (int i = 0; i < nblk_; ++i) {
99 int s = crvec_[i] & 0x3f;
100 /*
101 * Age this block.
102 * Once we hit the age threshold, we
103 * set CR_SEND as a hint to send a
104 * higher-quality version of the block.
105 * After this the block will stop aging,
106 * until there is motion. In the meantime,
107 * we might send it as background fill
108 * using the highest quality.
109 */
110 if (s & CR_AGE_BIT) {
111 int age = s & 0x1f;
112 age += 1;
113 if (age >= CR_AGETHRESH)
114 s = CR_MQ;
115 else
116 s = CR_AGE_BIT | age;
117 } else if (s & CR_MOTION_BIT) {
118 int slev = s & 0xf;
119 if (hlev == 0) {
120 s = CR_AGE_BIT;
121 if (slev > 0)
122 s |= CR_LQ;
123 } else if (hlev < slev)
124 s = CR_LQ|CR_MOTION_BIT | hlev;
125 }
126 crvec_[i] = s;
127 }
128 /*
129 * Bump the CR scan pointer. This variable controls which
130 * scan line of a block we use to make the replenishment
131 * decision. We skip 3 lines at a time to quickly precess
132 * over the block. Since 3 and 8 are coprime, we will
133 * sweep out every line.
134 */
135 scan_ = (scan_ + 3) & 7;
136
137 /*
138 * Now go through and look for some idle blocks to send
139 * as background fill. But only do background fill
140 * on the base layer.
141 */
142 if (hlev != 0)
143 return (hlev);
144
145 int blkno = rover_;
146 #ifdef notdef
147 int n = (delta_ * 2. < frametime_)? idle_high_ : idle_low_;
148 #endif
149 /* FIXME */
150 int n = 2;
151 while (n > 0) {
152 int s = crvec_[blkno];
153 /*
154 * If this block isn't being sent because of
155 * motion, send it as a high-quality background
156 * block. We used to check also that the block
157 * was not aging, but removed this constraint since
158 * at low bandwidth it takes too long to cycle
159 * through the whole image...
160 */
161 if ((s & CR_MOTION_BIT) == 0) {
162 crvec_[blkno] = CR_HQ;
163 --n;
164 }
165 if (++blkno >= nblk_) {
166 blkno = 0;
167 /* one way to guarantee loop termination */
168 break;
169 }
170 }
171 rover_ = blkno;
172
173 return (hlev);
174 }
175
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