Parent Directory | Revision Log
Revision 1054 - (view) (download)
1 : | edgomez | 221 | /***************************************************************************** |
2 : | * | ||
3 : | * XVID MPEG-4 VIDEO CODEC | ||
4 : | edgomez | 1054 | * - Deprecated code - |
5 : | edgomez | 221 | * |
6 : | edgomez | 1054 | * Copyright(C) 2002 Benjamin Lambert <foxer@hotmail.com> |
7 : | * | ||
8 : | edgomez | 851 | * This program is free software ; you can redistribute it and/or modify |
9 : | * it under the terms of the GNU General Public License as published by | ||
10 : | * the Free Software Foundation ; either version 2 of the License, or | ||
11 : | edgomez | 221 | * (at your option) any later version. |
12 : | * | ||
13 : | * This program is distributed in the hope that it will be useful, | ||
14 : | edgomez | 851 | * but WITHOUT ANY WARRANTY ; without even the implied warranty of |
15 : | edgomez | 221 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 : | * GNU General Public License for more details. | ||
17 : | * | ||
18 : | * You should have received a copy of the GNU General Public License | ||
19 : | edgomez | 851 | * along with this program ; if not, write to the Free Software |
20 : | edgomez | 221 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
21 : | * | ||
22 : | edgomez | 1054 | * $Id: ratecontrol.c,v 1.19.2.2 2003-06-09 13:55:47 edgomez Exp $ |
23 : | edgomez | 221 | * |
24 : | ****************************************************************************/ | ||
25 : | |||
26 : | edgomez | 851 | /* For the fabs function */ |
27 : | edgomez | 221 | #include <math.h> |
28 : | edgomez | 851 | |
29 : | edgomez | 221 | #include "ratecontrol.h" |
30 : | |||
31 : | /***************************************************************************** | ||
32 : | * Local prototype - defined at the end of the file | ||
33 : | ****************************************************************************/ | ||
34 : | |||
35 : | static int get_initial_quant(int bpp); | ||
36 : | |||
37 : | /***************************************************************************** | ||
38 : | * RateControlInit | ||
39 : | * | ||
40 : | * This function initialize the structure members of 'rate_control' argument | ||
41 : | * according to the other arguments. | ||
42 : | * | ||
43 : | * Returned value : None | ||
44 : | * | ||
45 : | ****************************************************************************/ | ||
46 : | |||
47 : | void | ||
48 : | RateControlInit(RateControl * rate_control, | ||
49 : | uint32_t target_rate, | ||
50 : | uint32_t reaction_delay_factor, | ||
51 : | uint32_t averaging_period, | ||
52 : | uint32_t buffer, | ||
53 : | int framerate, | ||
54 : | int max_quant, | ||
55 : | int min_quant) | ||
56 : | { | ||
57 : | int i; | ||
58 : | |||
59 : | rate_control->frames = 0; | ||
60 : | rate_control->total_size = 0; | ||
61 : | |||
62 : | rate_control->framerate = framerate / 1000.0; | ||
63 : | rate_control->target_rate = target_rate; | ||
64 : | |||
65 : | rate_control->rtn_quant = get_initial_quant(0); | ||
66 : | rate_control->max_quant = max_quant; | ||
67 : | rate_control->min_quant = min_quant; | ||
68 : | |||
69 : | for (i = 0; i < 32; ++i) { | ||
70 : | rate_control->quant_error[i] = 0.0; | ||
71 : | } | ||
72 : | |||
73 : | rate_control->target_framesize = | ||
74 : | (double) target_rate / 8.0 / rate_control->framerate; | ||
75 : | rate_control->sequence_quality = 2.0 / (double) rate_control->rtn_quant; | ||
76 : | rate_control->avg_framesize = rate_control->target_framesize; | ||
77 : | |||
78 : | rate_control->reaction_delay_factor = reaction_delay_factor; | ||
79 : | rate_control->averaging_period = averaging_period; | ||
80 : | rate_control->buffer = buffer; | ||
81 : | } | ||
82 : | |||
83 : | /***************************************************************************** | ||
84 : | * RateControlGetQ | ||
85 : | * | ||
86 : | * Returned value : - the current 'rate_control' quantizer value | ||
87 : | * | ||
88 : | ****************************************************************************/ | ||
89 : | |||
90 : | int | ||
91 : | RateControlGetQ(RateControl * rate_control, | ||
92 : | int keyframe) | ||
93 : | { | ||
94 : | return rate_control->rtn_quant; | ||
95 : | } | ||
96 : | |||
97 : | /***************************************************************************** | ||
98 : | * RateControlUpdate | ||
99 : | * | ||
100 : | * This function is called once a coded frame to update all internal | ||
101 : | * parameters of 'rate_control'. | ||
102 : | * | ||
103 : | * Returned value : None | ||
104 : | * | ||
105 : | ****************************************************************************/ | ||
106 : | |||
107 : | void | ||
108 : | RateControlUpdate(RateControl * rate_control, | ||
109 : | int16_t quant, | ||
110 : | int frame_size, | ||
111 : | int keyframe) | ||
112 : | { | ||
113 : | int64_t deviation; | ||
114 : | double overflow, averaging_period, reaction_delay_factor; | ||
115 : | double quality_scale, base_quality, target_quality; | ||
116 : | int32_t rtn_quant; | ||
117 : | |||
118 : | rate_control->frames++; | ||
119 : | rate_control->total_size += frame_size; | ||
120 : | |||
121 : | deviation = | ||
122 : | (int64_t) ((double) rate_control->total_size - | ||
123 : | ((double) | ||
124 : | ((double) rate_control->target_rate / 8.0 / | ||
125 : | (double) rate_control->framerate) * | ||
126 : | (double) rate_control->frames)); | ||
127 : | |||
128 : | suxen_drol | 1032 | DPRINTF(XVID_DEBUG_RC, "CBR: frame: %i, quant: %i, deviation: %i\n", |
129 : | edgomez | 851 | (int32_t)(rate_control->frames - 1), |
130 : | rate_control->rtn_quant, | ||
131 : | (int32_t) deviation); | ||
132 : | edgomez | 221 | |
133 : | if (rate_control->rtn_quant >= 2) { | ||
134 : | averaging_period = (double) rate_control->averaging_period; | ||
135 : | rate_control->sequence_quality -= | ||
136 : | rate_control->sequence_quality / averaging_period; | ||
137 : | rate_control->sequence_quality += | ||
138 : | 2.0 / (double) rate_control->rtn_quant / averaging_period; | ||
139 : | if (rate_control->sequence_quality < 0.1) | ||
140 : | rate_control->sequence_quality = 0.1; | ||
141 : | |||
142 : | if (!keyframe) { | ||
143 : | reaction_delay_factor = | ||
144 : | (double) rate_control->reaction_delay_factor; | ||
145 : | rate_control->avg_framesize -= | ||
146 : | rate_control->avg_framesize / reaction_delay_factor; | ||
147 : | rate_control->avg_framesize += frame_size / reaction_delay_factor; | ||
148 : | } | ||
149 : | } | ||
150 : | |||
151 : | quality_scale = | ||
152 : | rate_control->target_framesize / rate_control->avg_framesize * | ||
153 : | rate_control->target_framesize / rate_control->avg_framesize; | ||
154 : | |||
155 : | base_quality = rate_control->sequence_quality; | ||
156 : | if (quality_scale >= 1.0) { | ||
157 : | base_quality = 1.0 - (1.0 - base_quality) / quality_scale; | ||
158 : | } else { | ||
159 : | base_quality = 0.06452 + (base_quality - 0.06452) * quality_scale; | ||
160 : | } | ||
161 : | |||
162 : | overflow = -((double) deviation / (double) rate_control->buffer); | ||
163 : | |||
164 : | target_quality = | ||
165 : | base_quality + (base_quality - | ||
166 : | 0.06452) * overflow / rate_control->target_framesize; | ||
167 : | |||
168 : | if (target_quality > 2.0) | ||
169 : | target_quality = 2.0; | ||
170 : | else if (target_quality < 0.06452) | ||
171 : | target_quality = 0.06452; | ||
172 : | |||
173 : | rtn_quant = (int32_t) (2.0 / target_quality); | ||
174 : | |||
175 : | if (rtn_quant < 31) { | ||
176 : | rate_control->quant_error[rtn_quant] += | ||
177 : | 2.0 / target_quality - rtn_quant; | ||
178 : | if (rate_control->quant_error[rtn_quant] >= 1.0) { | ||
179 : | rate_control->quant_error[rtn_quant] -= 1.0; | ||
180 : | rtn_quant++; | ||
181 : | } | ||
182 : | } | ||
183 : | |||
184 : | if (rtn_quant > rate_control->rtn_quant + 1) | ||
185 : | rtn_quant = rate_control->rtn_quant + 1; | ||
186 : | else if (rtn_quant < rate_control->rtn_quant - 1) | ||
187 : | rtn_quant = rate_control->rtn_quant - 1; | ||
188 : | |||
189 : | if (rtn_quant > rate_control->max_quant) | ||
190 : | rtn_quant = rate_control->max_quant; | ||
191 : | else if (rtn_quant < rate_control->min_quant) | ||
192 : | rtn_quant = rate_control->min_quant; | ||
193 : | |||
194 : | rate_control->rtn_quant = rtn_quant; | ||
195 : | } | ||
196 : | |||
197 : | /***************************************************************************** | ||
198 : | * Local functions | ||
199 : | ****************************************************************************/ | ||
200 : | |||
201 : | static int | ||
202 : | get_initial_quant(int bpp) | ||
203 : | { | ||
204 : | return 5; | ||
205 : | } |
No admin address has been configured | ViewVC Help |
Powered by ViewVC 1.0.4 |