b841f48d131fabab21b1d37be84a46e90d31ddcb
[libav.git] / libavcodec / cavsdec.c
1 /*
2 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
3 * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder
25 * @author Stefan Gehrer <stefan.gehrer@gmx.de>
26 */
27
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "golomb.h"
31 #include "cavs.h"
32 #include "internal.h"
33 #include "mpeg12data.h"
34 #include "mpegvideo.h"
35
36 static const uint8_t mv_scan[4] = {
37 MV_FWD_X0, MV_FWD_X1,
38 MV_FWD_X2, MV_FWD_X3
39 };
40
41 static const uint8_t cbp_tab[64][2] = {
42 { 63, 0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, { 0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },
43 { 7, 14 }, { 5, 11 }, { 10, 12 }, { 8, 5 }, { 12, 10 }, { 61, 7 }, { 4, 48 }, { 55, 3 },
44 { 1, 2 }, { 2, 8 }, { 59, 4 }, { 3, 1 }, { 62, 61 }, { 9, 55 }, { 6, 59 }, { 29, 62 },
45 { 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53, 9 }, { 30, 6 },
46 { 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },
47 { 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },
48 { 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },
49 { 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }
50 };
51
52 static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
53
54 static const uint8_t cavs_chroma_qp[64] = {
55 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
56 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
57 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 44,
58 45, 45, 46, 46, 47, 47, 48, 48, 48, 49, 49, 49, 50, 50, 50, 51
59 };
60
61 static const uint8_t dequant_shift[64] = {
62 14, 14, 14, 14, 14, 14, 14, 14,
63 13, 13, 13, 13, 13, 13, 13, 13,
64 13, 12, 12, 12, 12, 12, 12, 12,
65 11, 11, 11, 11, 11, 11, 11, 11,
66 11, 10, 10, 10, 10, 10, 10, 10,
67 10, 9, 9, 9, 9, 9, 9, 9,
68 9, 8, 8, 8, 8, 8, 8, 8,
69 7, 7, 7, 7, 7, 7, 7, 7
70 };
71
72 static const uint16_t dequant_mul[64] = {
73 32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
74 32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
75 65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
76 32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
77 65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
78 65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
79 65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
80 32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
81 };
82
83 #define EOB 0, 0, 0
84
85 static const struct dec_2dvlc intra_dec[7] = {
86 {
87 { //level / run / table_inc
88 { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
89 { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
90 { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
91 { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 2, 1, 2 }, { -2, 1, 2 },
92 { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
93 { 1, 15, 1 }, { -1, 15, 1 }, { 2, 2, 2 }, { -2, 2, 2 }, { 1, 16, 1 }, { -1, 16, 1 },
94 { 1, 17, 1 }, { -1, 17, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 18, 1 }, { -1, 18, 1 },
95 { 1, 19, 1 }, { -1, 19, 1 }, { 2, 3, 2 }, { -2, 3, 2 }, { 1, 20, 1 }, { -1, 20, 1 },
96 { 1, 21, 1 }, { -1, 21, 1 }, { 2, 4, 2 }, { -2, 4, 2 }, { 1, 22, 1 }, { -1, 22, 1 },
97 { 2, 5, 2 }, { -2, 5, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { EOB }
98 },
99 //level_add
100 { 0, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1 },
101 2, //golomb_order
102 0, //inc_limit
103 23, //max_run
104 },
105 {
106 { //level / run
107 { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 }, { -2, 1, 1 },
108 { 1, 3, 0 }, { -1, 3, 0 }, { EOB }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
109 { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 2, 2, 1 },
110 { -2, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 1, 9, 0 },
111 { -1, 9, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 4, 1, 2 }, { -4, 1, 2 }, { 1, 10, 0 },
112 { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 3, 2, 2 },
113 { -3, 2, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 5, 1, 3 },
114 { -5, 1, 3 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 14, 0 },
115 { -1, 14, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 2, 8, 1 }, { -2, 8, 1 }, { 3, 3, 2 },
116 { -3, 3, 2 }, { 6, 1, 3 }, { -6, 1, 3 }, { 1, 15, 0 }, { -1, 15, 0 }
117 },
118 //level_add
119 { 0, 7, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
120 2, //golomb_order
121 1, //inc_limit
122 15, //max_run
123 },
124 {
125 { //level / run
126 { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 },
127 { 3, 1, 1 }, { -3, 1, 1 }, { EOB }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
128 { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
129 { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
130 { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 2, 4, 0 },
131 { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
132 { -7, 1, 2 }, { 3, 3, 1 }, { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 },
133 { -1, 8, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 3 }, { -8, 1, 3 }, { 1, 9, 0 },
134 { -1, 9, 0 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 }, { 2, 7, 0 },
135 { -2, 7, 0 }, { 9, 1, 3 }, { -9, 1, 3 }, { 1, 10, 0 }, { -1, 10, 0 }
136 },
137 //level_add
138 { 0, 10, 6, 4, 4, 3, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
139 2, //golomb_order
140 2, //inc_limit
141 10, //max_run
142 },
143 {
144 { //level / run
145 { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
146 { 1, 2, 0 }, { -1, 2, 0 }, { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 1 },
147 { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 1 },
148 { -6, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
149 { -1, 4, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
150 { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 5, 2, 1 },
151 { -5, 2, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 10, 1, 2 }, {-10, 1, 2 }, { 3, 3, 0 },
152 { -3, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 11, 1, 3 }, {-11, 1, 3 }, { 6, 2, 1 },
153 { -6, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 5, 0 }, { -2, 5, 0 }, { 3, 4, 0 },
154 { -3, 4, 0 }, { 12, 1, 3 }, {-12, 1, 3 }, { 4, 3, 0 }, { -4, 3, 0 }
155 },
156 //level_add
157 { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
158 2, //golomb_order
159 4, //inc_limit
160 7, //max_run
161 },
162 {
163 { //level / run
164 { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
165 { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
166 { -6, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 1 },
167 { -8, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 10, 1, 1 },
168 {-10, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 2 },
169 {-11, 1, 2 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 13, 1, 2 },
170 {-13, 1, 2 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 },
171 { -2, 3, 0 }, { 14, 1, 2 }, {-14, 1, 2 }, { 6, 2, 0 }, { -6, 2, 0 }, { 15, 1, 2 },
172 {-15, 1, 2 }, { 16, 1, 2 }, {-16, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 5, 0 },
173 { -1, 5, 0 }, { 7, 2, 0 }, { -7, 2, 0 }, { 17, 1, 2 }, {-17, 1, 2 }
174 },
175 //level_add
176 { 0,18, 8, 4, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
177 2, //golomb_order
178 7, //inc_limit
179 5, //max_run
180 },
181 {
182 { //level / run
183 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
184 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
185 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
186 { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 11, 1, 1 },
187 {-11, 1, 1 }, { 12, 1, 1 }, {-12, 1, 1 }, { 13, 1, 1 }, {-13, 1, 1 }, { 2, 2, 0 },
188 { -2, 2, 0 }, { 14, 1, 1 }, {-14, 1, 1 }, { 15, 1, 1 }, {-15, 1, 1 }, { 3, 2, 0 },
189 { -3, 2, 0 }, { 16, 1, 1 }, {-16, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 17, 1, 1 },
190 {-17, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 18, 1, 1 }, {-18, 1, 1 }, { 5, 2, 0 },
191 { -5, 2, 0 }, { 19, 1, 1 }, {-19, 1, 1 }, { 20, 1, 1 }, {-20, 1, 1 }, { 6, 2, 0 },
192 { -6, 2, 0 }, { 21, 1, 1 }, {-21, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }
193 },
194 //level_add
195 { 0, 22, 7, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
196 2, //golomb_order
197 10, //inc_limit
198 3, //max_run
199 },
200 {
201 { //level / run
202 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
203 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
204 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
205 { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 11, 1, 0 }, {-11, 1, 0 }, { 12, 1, 0 },
206 {-12, 1, 0 }, { 13, 1, 0 }, {-13, 1, 0 }, { 14, 1, 0 }, {-14, 1, 0 }, { 15, 1, 0 },
207 {-15, 1, 0 }, { 16, 1, 0 }, {-16, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 17, 1, 0 },
208 {-17, 1, 0 }, { 18, 1, 0 }, {-18, 1, 0 }, { 19, 1, 0 }, {-19, 1, 0 }, { 20, 1, 0 },
209 {-20, 1, 0 }, { 21, 1, 0 }, {-21, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 22, 1, 0 },
210 {-22, 1, 0 }, { 23, 1, 0 }, {-23, 1, 0 }, { 24, 1, 0 }, {-24, 1, 0 }, { 25, 1, 0 },
211 {-25, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 26, 1, 0 }, {-26, 1, 0 }
212 },
213 //level_add
214 { 0, 27, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
215 2, //golomb_order
216 INT_MAX, //inc_limit
217 2, //max_run
218 }
219 };
220
221 static const struct dec_2dvlc inter_dec[7] = {
222 {
223 { //level / run
224 { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
225 { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
226 { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
227 { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 1, 12, 1 }, { -1, 12, 1 },
228 { 1, 13, 1 }, { -1, 13, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 14, 1 }, { -1, 14, 1 },
229 { 1, 15, 1 }, { -1, 15, 1 }, { 1, 16, 1 }, { -1, 16, 1 }, { 1, 17, 1 }, { -1, 17, 1 },
230 { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 }, { 3, 1, 3 }, { -3, 1, 3 },
231 { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 2, 2, 2 }, { -2, 2, 2 },
232 { 1, 22, 1 }, { -1, 22, 1 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
233 { 1, 25, 1 }, { -1, 25, 1 }, { 1, 26, 1 }, { -1, 26, 1 }, { EOB }
234 },
235 //level_add
236 { 0, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 },
237 3, //golomb_order
238 0, //inc_limit
239 26 //max_run
240 },
241 {
242 { //level / run
243 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 1, 3, 0 },
244 { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
245 { -1, 6, 0 }, { 2, 1, 1 }, { -2, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 },
246 { -1, 8, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 2, 2, 1 },
247 { -2, 2, 1 }, { 1, 11, 0 }, { -1, 11, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 1, 2 },
248 { -3, 1, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 }, { -1, 14, 0 }, { 2, 3, 1 },
249 { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 1, 16, 0 },
250 { -1, 16, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 1, 17, 0 }, { -1, 17, 0 }, { 4, 1, 3 },
251 { -4, 1, 3 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 18, 0 }, { -1, 18, 0 }, { 1, 19, 0 },
252 { -1, 19, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 3, 2, 2 }, { -3, 2, 2 }
253 },
254 //level_add
255 { 0, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1 },
256 2, //golomb_order
257 1, //inc_limit
258 19 //max_run
259 },
260 {
261 { //level / run
262 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 0 },
263 { -2, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 3, 1, 1 },
264 { -3, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
265 { -1, 6, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 1, 2 },
266 { -4, 1, 2 }, { 1, 8, 0 }, { -1, 8, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 4, 0 },
267 { -2, 4, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 5, 1, 2 },
268 { -5, 1, 2 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 6, 0 },
269 { -2, 6, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 3, 1 }, { -3, 3, 1 }, { 6, 1, 2 },
270 { -6, 1, 2 }, { 4, 2, 2 }, { -4, 2, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 7, 0 },
271 { -2, 7, 0 }, { 3, 4, 1 }, { -3, 4, 1 }, { 1, 14, 0 }, { -1, 14, 0 }
272 },
273 //level_add
274 { 0, 7, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
275 2, //golomb_order
276 2, //inc_limit
277 14 //max_run
278 },
279 {
280 { //level / run
281 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
282 { -1, 2, 0 }, { 3, 1, 0 }, { -3, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
283 { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 1 },
284 { -5, 1, 1 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 2, 3, 0 },
285 { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 2, 4, 0 },
286 { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
287 { -7, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 5, 0 },
288 { -2, 5, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 4, 0 },
289 { -3, 4, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 1, 10, 0 },
290 { -1, 10, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 4, 3, 1 }, { -4, 3, 1 }
291 },
292 //level_add
293 { 0,10, 6, 5, 4, 3, 3, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
294 2, //golomb_order
295 3, //inc_limit
296 10 //max_run
297 },
298 {
299 { //level / run
300 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
301 { -3, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 },
302 { -5, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 0 },
303 { -6, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
304 { -1, 4, 0 }, { 8, 1, 1 }, { -8, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
305 { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 5, 2, 0 },
306 { -5, 2, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 10, 1, 2 },
307 {-10, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 11, 1, 2 }, {-11, 1, 2 }, { 1, 7, 0 },
308 { -1, 7, 0 }, { 6, 2, 0 }, { -6, 2, 0 }, { 3, 4, 0 }, { -3, 4, 0 }, { 2, 5, 0 },
309 { -2, 5, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 4, 3, 0 }, { -4, 3, 0 }
310 },
311 //level_add
312 { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
313 2, //golomb_order
314 6, //inc_limit
315 7 //max_run
316 },
317 {
318 { //level / run
319 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
320 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 1, 2, 0 },
321 { -1, 2, 0 }, { 6, 1, 0 }, { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 },
322 { -8, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 1, 3, 0 },
323 { -1, 3, 0 }, { 10, 1, 1 }, { -10, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 1 },
324 { -11, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 1 }, { -12, 1, 1 }, { 1, 4, 0 },
325 { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 13, 1, 1 }, { -13, 1, 1 }, { 5, 2, 0 },
326 { -5, 2, 0 }, { 14, 1, 1 }, { -14, 1, 1 }, { 6, 2, 0 }, { -6, 2, 0 }, { 1, 5, 0 },
327 { -1, 5, 0 }, { 15, 1, 1 }, { -15, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 16, 1, 1 },
328 { -16, 1, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 2, 0 }, { -7, 2, 0 }
329 },
330 //level_add
331 { 0, 17, 8, 4, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
332 2, //golomb_order
333 9, //inc_limit
334 5 //max_run
335 },
336 {
337 { //level / run
338 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
339 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
340 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 8, 1, 0 },
341 { -8, 1, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
342 { -11, 1, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 13, 1, 0 },
343 { -13, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 15, 1, 0 },
344 { -15, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 16, 1, 0 }, { -16, 1, 0 }, { 17, 1, 0 },
345 { -17, 1, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 19, 1, 0 },
346 { -19, 1, 0 }, { 20, 1, 0 }, { -20, 1, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 1, 4, 0 },
347 { -1, 4, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 21, 1, 0 }, { -21, 1, 0 }
348 },
349 //level_add
350 { 0, 22, 6, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
351 2, //golomb_order
352 INT_MAX, //inc_limit
353 4 //max_run
354 }
355 };
356
357 static const struct dec_2dvlc chroma_dec[5] = {
358 {
359 { //level / run
360 { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
361 { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
362 { 1, 7, 1 }, { -1, 7, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 8, 1 }, { -1, 8, 1 },
363 { 1, 9, 1 }, { -1, 9, 1 }, { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 },
364 { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
365 { 1, 15, 1 }, { -1, 15, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 16, 1 }, { -1, 16, 1 },
366 { 1, 17, 1 }, { -1, 17, 1 }, { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 },
367 { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 1, 22, 1 }, { -1, 22, 1 },
368 { 2, 2, 2 }, { -2, 2, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
369 { 1, 25, 1 }, { -1, 25, 1 }, { 4, 1, 3 }, { -4, 1, 3 }, { EOB }
370 },
371 //level_add
372 { 0, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1 },
373 2, //golomb_order
374 0, //inc_limit
375 25 //max_run
376 },
377 {
378 { //level / run
379 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 },
380 { -2, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
381 { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 1, 7, 0 },
382 { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 2, 1 }, { -2, 2, 1 }, { 1, 9, 0 },
383 { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 4, 1, 2 },
384 { -4, 1, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 },
385 { -1, 14, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 },
386 { -2, 4, 1 }, { 5, 1, 3 }, { -5, 1, 3 }, { 3, 2, 2 }, { -3, 2, 2 }, { 1, 16, 0 },
387 { -1, 16, 0 }, { 1, 17, 0 }, { -1, 17, 0 }, { 1, 18, 0 }, { -1, 18, 0 }, { 2, 5, 1 },
388 { -2, 5, 1 }, { 1, 19, 0 }, { -1, 19, 0 }, { 1, 20, 0 }, { -1, 20, 0 }
389 },
390 //level_add
391 { 0, 6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1 },
392 0, //golomb_order
393 1, //inc_limit
394 20 //max_run
395 },
396 {
397 { //level / run
398 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
399 { -1, 2, 0 }, { 3, 1, 1 }, { -3, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 4, 1, 1 },
400 { -4, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
401 { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
402 { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 1, 7, 0 },
403 { -1, 7, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 1, 2 }, { -7, 1, 2 }, { 1, 8, 0 },
404 { -1, 8, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 3, 1 },
405 { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 2 },
406 { -8, 1, 2 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 9, 1, 2 },
407 { -9, 1, 2 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 },
408 },
409 //level_add
410 { 0,10, 6, 4, 4, 3, 3, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
411 1, //golomb_order
412 2, //inc_limit
413 11 //max_run
414 },
415 {
416 { //level / run
417 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
418 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 5, 1, 1 },
419 { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 1, 3, 0 },
420 { -1, 3, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 8, 1, 1 },
421 { -8, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 9, 1, 1 },
422 { -9, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 10, 1, 1 },
423 {-10, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 2, 4, 0 },
424 { -2, 4, 0 }, { 11, 1, 1 }, {-11, 1, 1 }, { 1, 6, 0 }, { -1, 6, 0 }, { 12, 1, 1 },
425 {-12, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 6, 2, 1 }, { -6, 2, 1 }, { 13, 1, 1 },
426 {-13, 1, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 }, { -1, 8, 0 },
427 },
428 //level_add
429 { 0, 14, 7, 4, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
430 1, //golomb_order
431 4, //inc_limit
432 8 //max_run
433 },
434 {
435 { //level / run
436 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
437 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
438 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 1, 2, 0 },
439 { -1, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
440 { -11, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 13, 1, 0 },
441 { -13, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 1, 3, 0 },
442 { -1, 3, 0 }, { 15, 1, 0 }, { -15, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 16, 1, 0 },
443 { -16, 1, 0 }, { 17, 1, 0 }, { -17, 1, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 },
444 { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 6, 2, 0 },
445 { -6, 2, 0 }, { 19, 1, 0 }, { -19, 1, 0 }, { 1, 5, 0 }, { -1, 5, 0 },
446 },
447 //level_add
448 { 0, 20, 7, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
449 0, //golomb_order
450 INT_MAX, //inc_limit
451 5, //max_run
452 }
453 };
454
455 #undef EOB
456
457 /*****************************************************************************
458 *
459 * motion vector prediction
460 *
461 ****************************************************************************/
462
463 static inline void store_mvs(AVSContext *h)
464 {
465 h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
466 h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
467 h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
468 h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
469 }
470
471 static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
472 cavs_vector *col_mv)
473 {
474 cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
475 int den = h->direct_den[col_mv->ref];
476 int m = col_mv->x >> 31;
477
478 pmv_fw->dist = h->dist[1];
479 pmv_bw->dist = h->dist[0];
480 pmv_fw->ref = 1;
481 pmv_bw->ref = 0;
482 /* scale the co-located motion vector according to its temporal span */
483 pmv_fw->x = (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
484 pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
485 m = col_mv->y >> 31;
486 pmv_fw->y = (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
487 pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
488 }
489
490 static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
491 enum cavs_block size)
492 {
493 cavs_vector *dst = src + MV_BWD_OFFS;
494
495 /* backward mv is the scaled and negated forward mv */
496 dst->x = -((src->x * h->sym_factor + 256) >> 9);
497 dst->y = -((src->y * h->sym_factor + 256) >> 9);
498 dst->ref = 0;
499 dst->dist = h->dist[0];
500 set_mvs(dst, size);
501 }
502
503 /*****************************************************************************
504 *
505 * residual data decoding
506 *
507 ****************************************************************************/
508
509 /** kth-order exponential golomb code */
510 static inline int get_ue_code(GetBitContext *gb, int order)
511 {
512 if (order) {
513 int ret = get_ue_golomb(gb) << order;
514 return ret + get_bits(gb, order);
515 }
516 return get_ue_golomb(gb);
517 }
518
519 static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
520 int16_t *dst, int mul, int shift, int coeff_num)
521 {
522 int round = 1 << (shift - 1);
523 int pos = -1;
524 const uint8_t *scantab = h->scantable.permutated;
525
526 /* inverse scan and dequantization */
527 while (--coeff_num >= 0) {
528 pos += run_buf[coeff_num];
529 if (pos > 63) {
530 av_log(h->avctx, AV_LOG_ERROR,
531 "position out of block bounds at pic %d MB(%d,%d)\n",
532 h->cur.poc, h->mbx, h->mby);
533 return -1;
534 }
535 dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
536 }
537 return 0;
538 }
539
540 /**
541 * decode coefficients from one 8x8 block, dequantize, inverse transform
542 * and add them to sample block
543 * @param r pointer to 2D VLC table
544 * @param esc_golomb_order escape codes are k-golomb with this order k
545 * @param qp quantizer
546 * @param dst location of sample block
547 * @param stride line stride in frame buffer
548 */
549 static int decode_residual_block(AVSContext *h, GetBitContext *gb,
550 const struct dec_2dvlc *r, int esc_golomb_order,
551 int qp, uint8_t *dst, int stride)
552 {
553 int i, level_code, esc_code, level, run, mask;
554 int16_t level_buf[65];
555 uint8_t run_buf[65];
556 int16_t *block = h->block;
557
558 for (i = 0;i < 65; i++) {
559 level_code = get_ue_code(gb, r->golomb_order);
560 if (level_code >= ESCAPE_CODE) {
561 run = ((level_code - ESCAPE_CODE) >> 1) + 1;
562 esc_code = get_ue_code(gb, esc_golomb_order);
563 level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
564 while (level > r->inc_limit)
565 r++;
566 mask = -(level_code & 1);
567 level = (level ^ mask) - mask;
568 } else if (level_code >= 0) {
569 level = r->rltab[level_code][0];
570 if (!level) //end of block signal
571 break;
572 run = r->rltab[level_code][1];
573 r += r->rltab[level_code][2];
574 } else {
575 break;
576 }
577 level_buf[i] = level;
578 run_buf[i] = run;
579 }
580 if (dequant(h, level_buf, run_buf, block, dequant_mul[qp],
581 dequant_shift[qp], i))
582 return -1;
583 h->cdsp.cavs_idct8_add(dst, block, stride);
584 h->dsp.clear_block(block);
585 return 0;
586 }
587
588
589 static inline void decode_residual_chroma(AVSContext *h)
590 {
591 if (h->cbp & (1 << 4))
592 decode_residual_block(h, &h->gb, chroma_dec, 0,
593 cavs_chroma_qp[h->qp], h->cu, h->c_stride);
594 if (h->cbp & (1 << 5))
595 decode_residual_block(h, &h->gb, chroma_dec, 0,
596 cavs_chroma_qp[h->qp], h->cv, h->c_stride);
597 }
598
599 static inline int decode_residual_inter(AVSContext *h)
600 {
601 int block;
602
603 /* get coded block pattern */
604 int cbp = get_ue_golomb(&h->gb);
605 if (cbp > 63) {
606 av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp\n");
607 return -1;
608 }
609 h->cbp = cbp_tab[cbp][1];
610
611 /* get quantizer */
612 if (h->cbp && !h->qp_fixed)
613 h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;
614 for (block = 0; block < 4; block++)
615 if (h->cbp & (1 << block))
616 decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
617 h->cy + h->luma_scan[block], h->l_stride);
618 decode_residual_chroma(h);
619
620 return 0;
621 }
622
623 /*****************************************************************************
624 *
625 * macroblock level
626 *
627 ****************************************************************************/
628
629 static inline void set_mv_intra(AVSContext *h)
630 {
631 h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
632 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
633 h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
634 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
635 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
636 h->col_type_base[h->mbidx] = I_8X8;
637 }
638
639 static int decode_mb_i(AVSContext *h, int cbp_code)
640 {
641 GetBitContext *gb = &h->gb;
642 unsigned pred_mode_uv;
643 int block;
644 uint8_t top[18];
645 uint8_t *left = NULL;
646 uint8_t *d;
647
648 ff_cavs_init_mb(h);
649
650 /* get intra prediction modes from stream */
651 for (block = 0; block < 4; block++) {
652 int nA, nB, predpred;
653 int pos = scan3x3[block];
654
655 nA = h->pred_mode_Y[pos - 1];
656 nB = h->pred_mode_Y[pos - 3];
657 predpred = FFMIN(nA, nB);
658 if (predpred == NOT_AVAIL) // if either is not available
659 predpred = INTRA_L_LP;
660 if (!get_bits1(gb)) {
661 int rem_mode = get_bits(gb, 2);
662 predpred = rem_mode + (rem_mode >= predpred);
663 }
664 h->pred_mode_Y[pos] = predpred;
665 }
666 pred_mode_uv = get_ue_golomb(gb);
667 if (pred_mode_uv > 6) {
668 av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
669 return -1;
670 }
671 ff_cavs_modify_mb_i(h, &pred_mode_uv);
672
673 /* get coded block pattern */
674 if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
675 cbp_code = get_ue_golomb(gb);
676 if (cbp_code > 63) {
677 av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
678 return -1;
679 }
680 h->cbp = cbp_tab[cbp_code][0];
681 if (h->cbp && !h->qp_fixed)
682 h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
683
684 /* luma intra prediction interleaved with residual decode/transform/add */
685 for (block = 0; block < 4; block++) {
686 d = h->cy + h->luma_scan[block];
687 ff_cavs_load_intra_pred_luma(h, top, &left, block);
688 h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
689 (d, top, left, h->l_stride);
690 if (h->cbp & (1<<block))
691 decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
692 }
693
694 /* chroma intra prediction */
695 ff_cavs_load_intra_pred_chroma(h);
696 h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
697 h->left_border_u, h->c_stride);
698 h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
699 h->left_border_v, h->c_stride);
700
701 decode_residual_chroma(h);
702 ff_cavs_filter(h, I_8X8);
703 set_mv_intra(h);
704 return 0;
705 }
706
707 static inline void set_intra_mode_default(AVSContext *h)
708 {
709 if (h->stream_revision > 0) {
710 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
711 h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
712 } else {
713 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
714 h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
715 }
716 }
717
718 static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
719 {
720 GetBitContext *gb = &h->gb;
721 int ref[4];
722
723 ff_cavs_init_mb(h);
724 switch (mb_type) {
725 case P_SKIP:
726 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
727 break;
728 case P_16X16:
729 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
730 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
731 break;
732 case P_16X8:
733 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
734 ref[2] = h->ref_flag ? 0 : get_bits1(gb);
735 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
736 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
737 break;
738 case P_8X16:
739 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
740 ref[1] = h->ref_flag ? 0 : get_bits1(gb);
741 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
742 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
743 break;
744 case P_8X8:
745 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
746 ref[1] = h->ref_flag ? 0 : get_bits1(gb);
747 ref[2] = h->ref_flag ? 0 : get_bits1(gb);
748 ref[3] = h->ref_flag ? 0 : get_bits1(gb);
749 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
750 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
751 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
752 ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
753 }
754 ff_cavs_inter(h, mb_type);
755 set_intra_mode_default(h);
756 store_mvs(h);
757 if (mb_type != P_SKIP)
758 decode_residual_inter(h);
759 ff_cavs_filter(h, mb_type);
760 h->col_type_base[h->mbidx] = mb_type;
761 }
762
763 static void decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
764 {
765 int block;
766 enum cavs_sub_mb sub_type[4];
767 int flags;
768
769 ff_cavs_init_mb(h);
770
771 /* reset all MVs */
772 h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
773 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
774 h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
775 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
776 switch (mb_type) {
777 case B_SKIP:
778 case B_DIRECT:
779 if (!h->col_type_base[h->mbidx]) {
780 /* intra MB at co-location, do in-plane prediction */
781 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
782 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
783 } else
784 /* direct prediction from co-located P MB, block-wise */
785 for (block = 0; block < 4; block++)
786 mv_pred_direct(h, &h->mv[mv_scan[block]],
787 &h->col_mv[h->mbidx * 4 + block]);
788 break;
789 case B_FWD_16X16:
790 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
791 break;
792 case B_SYM_16X16:
793 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
794 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
795 break;
796 case B_BWD_16X16:
797 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
798 break;
799 case B_8X8:
800 for (block = 0; block < 4; block++)
801 sub_type[block] = get_bits(&h->gb, 2);
802 for (block = 0; block < 4; block++) {
803 switch (sub_type[block]) {
804 case B_SUB_DIRECT:
805 if (!h->col_type_base[h->mbidx]) {
806 /* intra MB at co-location, do in-plane prediction */
807 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
808 MV_PRED_BSKIP, BLK_8X8, 1);
809 ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
810 mv_scan[block] - 3 + MV_BWD_OFFS,
811 MV_PRED_BSKIP, BLK_8X8, 0);
812 } else
813 mv_pred_direct(h, &h->mv[mv_scan[block]],
814 &h->col_mv[h->mbidx * 4 + block]);
815 break;
816 case B_SUB_FWD:
817 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
818 MV_PRED_MEDIAN, BLK_8X8, 1);
819 break;
820 case B_SUB_SYM:
821 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
822 MV_PRED_MEDIAN, BLK_8X8, 1);
823 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
824 break;
825 }
826 }
827 for (block = 0; block < 4; block++) {
828 if (sub_type[block] == B_SUB_BWD)
829 ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
830 mv_scan[block] + MV_BWD_OFFS - 3,
831 MV_PRED_MEDIAN, BLK_8X8, 0);
832 }
833 break;
834 default:
835 assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));
836 flags = ff_cavs_partition_flags[mb_type];
837 if (mb_type & 1) { /* 16x8 macroblock types */
838 if (flags & FWD0)
839 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
840 if (flags & SYM0)
841 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
842 if (flags & FWD1)
843 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
844 if (flags & SYM1)
845 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
846 if (flags & BWD0)
847 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
848 if (flags & BWD1)
849 ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
850 } else { /* 8x16 macroblock types */
851 if (flags & FWD0)
852 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
853 if (flags & SYM0)
854 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
855 if (flags & FWD1)
856 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
857 if (flags & SYM1)
858 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
859 if (flags & BWD0)
860 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
861 if (flags & BWD1)
862 ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
863 }
864 }
865 ff_cavs_inter(h, mb_type);
866 set_intra_mode_default(h);
867 if (mb_type != B_SKIP)
868 decode_residual_inter(h);
869 ff_cavs_filter(h, mb_type);
870 }
871
872 /*****************************************************************************
873 *
874 * slice level
875 *
876 ****************************************************************************/
877
878 static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
879 {
880 if (h->stc > 0xAF)
881 av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
882 h->mby = h->stc;
883 h->mbidx = h->mby * h->mb_width;
884
885 /* mark top macroblocks as unavailable */
886 h->flags &= ~(B_AVAIL | C_AVAIL);
887 if ((h->mby == 0) && (!h->qp_fixed)) {
888 h->qp_fixed = get_bits1(gb);
889 h->qp = get_bits(gb, 6);
890 }
891 /* inter frame or second slice can have weighting params */
892 if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
893 (!h->pic_structure && h->mby >= h->mb_width / 2))
894 if (get_bits1(gb)) { //slice_weighting_flag
895 av_log(h->avctx, AV_LOG_ERROR,
896 "weighted prediction not yet supported\n");
897 }
898 return 0;
899 }
900
901 static inline int check_for_slice(AVSContext *h)
902 {
903 GetBitContext *gb = &h->gb;
904 int align;
905
906 if (h->mbx)
907 return 0;
908 align = (-get_bits_count(gb)) & 7;
909 /* check for stuffing byte */
910 if (!align && (show_bits(gb, 8) == 0x80))
911 align = 8;
912 if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
913 skip_bits_long(gb, 24 + align);
914 h->stc = get_bits(gb, 8);
915 if (h->stc >= h->mb_height)
916 return 0;
917 decode_slice_header(h, gb);
918 return 1;
919 }
920 return 0;
921 }
922
923 /*****************************************************************************
924 *
925 * frame level
926 *
927 ****************************************************************************/
928
929 static int decode_pic(AVSContext *h)
930 {
931 int skip_count = -1;
932 enum cavs_mb mb_type;
933
934 skip_bits(&h->gb, 16);//bbv_dwlay
935 if (h->stc == PIC_PB_START_CODE) {
936 h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
937 if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
938 av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
939 return -1;
940 }
941 /* make sure we have the reference frames we need */
942 if (!h->DPB[0].f->data[0] ||
943 (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
944 return -1;
945 } else {
946 h->cur.f->pict_type = AV_PICTURE_TYPE_I;
947 if (get_bits1(&h->gb))
948 skip_bits(&h->gb, 24);//time_code
949 /* old sample clips were all progressive and no low_delay,
950 bump stream revision if detected otherwise */
951 if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
952 h->stream_revision = 1;
953 /* similarly test top_field_first and repeat_first_field */
954 else if (show_bits(&h->gb, 11) & 3)
955 h->stream_revision = 1;
956 if (h->stream_revision > 0)
957 skip_bits(&h->gb, 1); //marker_bit
958 }
959 /* release last B frame */
960 if (h->cur.f->data[0])
961 h->avctx->release_buffer(h->avctx, h->cur.f);
962
963 ff_get_buffer(h->avctx, h->cur.f);
964
965 if (!h->edge_emu_buffer) {
966 int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
967 h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
968 if (!h->edge_emu_buffer)
969 return AVERROR(ENOMEM);
970 }
971
972 ff_cavs_init_pic(h);
973 h->cur.poc = get_bits(&h->gb, 8) * 2;
974
975 /* get temporal distances and MV scaling factors */
976 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
977 h->dist[0] = (h->cur.poc - h->DPB[0].poc + 512) % 512;
978 } else {
979 h->dist[0] = (h->DPB[0].poc - h->cur.poc + 512) % 512;
980 }
981 h->dist[1] = (h->cur.poc - h->DPB[1].poc + 512) % 512;
982 h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
983 h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
984 if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
985 h->sym_factor = h->dist[0] * h->scale_den[1];
986 } else {
987 h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
988 h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
989 }
990
991 if (h->low_delay)
992 get_ue_golomb(&h->gb); //bbv_check_times
993 h->progressive = get_bits1(&h->gb);
994 h->pic_structure = 1;
995 if (!h->progressive)
996 h->pic_structure = get_bits1(&h->gb);
997 if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
998 skip_bits1(&h->gb); //advanced_pred_mode_disable
999 skip_bits1(&h->gb); //top_field_first
1000 skip_bits1(&h->gb); //repeat_first_field
1001 h->qp_fixed = get_bits1(&h->gb);
1002 h->qp = get_bits(&h->gb, 6);
1003 if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1004 if (!h->progressive && !h->pic_structure)
1005 skip_bits1(&h->gb);//what is this?
1006 skip_bits(&h->gb, 4); //reserved bits
1007 } else {
1008 if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
1009 h->ref_flag = get_bits1(&h->gb);
1010 skip_bits(&h->gb, 4); //reserved bits
1011 h->skip_mode_flag = get_bits1(&h->gb);
1012 }
1013 h->loop_filter_disable = get_bits1(&h->gb);
1014 if (!h->loop_filter_disable && get_bits1(&h->gb)) {
1015 h->alpha_offset = get_se_golomb(&h->gb);
1016 h->beta_offset = get_se_golomb(&h->gb);
1017 } else {
1018 h->alpha_offset = h->beta_offset = 0;
1019 }
1020 if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1021 do {
1022 check_for_slice(h);
1023 decode_mb_i(h, 0);
1024 } while (ff_cavs_next_mb(h));
1025 } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
1026 do {
1027 if (check_for_slice(h))
1028 skip_count = -1;
1029 if (h->skip_mode_flag && (skip_count < 0))
1030 skip_count = get_ue_golomb(&h->gb);
1031 if (h->skip_mode_flag && skip_count--) {
1032 decode_mb_p(h, P_SKIP);
1033 } else {
1034 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
1035 if (mb_type > P_8X8)
1036 decode_mb_i(h, mb_type - P_8X8 - 1);
1037 else
1038 decode_mb_p(h, mb_type);
1039 }
1040 } while (ff_cavs_next_mb(h));
1041 } else { /* AV_PICTURE_TYPE_B */
1042 do {
1043 if (check_for_slice(h))
1044 skip_count = -1;
1045 if (h->skip_mode_flag && (skip_count < 0))
1046 skip_count = get_ue_golomb(&h->gb);
1047 if (h->skip_mode_flag && skip_count--) {
1048 decode_mb_b(h, B_SKIP);
1049 } else {
1050 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
1051 if (mb_type > B_8X8)
1052 decode_mb_i(h, mb_type - B_8X8 - 1);
1053 else
1054 decode_mb_b(h, mb_type);
1055 }
1056 } while (ff_cavs_next_mb(h));
1057 }
1058 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1059 if (h->DPB[1].f->data[0])
1060 h->avctx->release_buffer(h->avctx, h->DPB[1].f);
1061 FFSWAP(AVSFrame, h->cur, h->DPB[1]);
1062 FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
1063 }
1064 return 0;
1065 }
1066
1067 /*****************************************************************************
1068 *
1069 * headers and interface
1070 *
1071 ****************************************************************************/
1072
1073 static int decode_seq_header(AVSContext *h)
1074 {
1075 int frame_rate_code;
1076 int width, height;
1077
1078 h->profile = get_bits(&h->gb, 8);
1079 h->level = get_bits(&h->gb, 8);
1080 skip_bits1(&h->gb); //progressive sequence
1081
1082 width = get_bits(&h->gb, 14);
1083 height = get_bits(&h->gb, 14);
1084 if ((h->width || h->height) && (h->width != width || h->height != height)) {
1085 av_log_missing_feature(h->avctx, "Width/height changing in CAVS", 0);
1086 return AVERROR_PATCHWELCOME;
1087 }
1088 h->width = width;
1089 h->height = height;
1090
1091 skip_bits(&h->gb, 2); //chroma format
1092 skip_bits(&h->gb, 3); //sample_precision
1093 h->aspect_ratio = get_bits(&h->gb, 4);
1094 frame_rate_code = get_bits(&h->gb, 4);
1095 skip_bits(&h->gb, 18); //bit_rate_lower
1096 skip_bits1(&h->gb); //marker_bit
1097 skip_bits(&h->gb, 12); //bit_rate_upper
1098 h->low_delay = get_bits1(&h->gb);
1099 h->mb_width = (h->width + 15) >> 4;
1100 h->mb_height = (h->height + 15) >> 4;
1101 h->avctx->time_base.den = ff_mpeg12_frame_rate_tab[frame_rate_code].num;
1102 h->avctx->time_base.num = ff_mpeg12_frame_rate_tab[frame_rate_code].den;
1103 h->avctx->width = h->width;
1104 h->avctx->height = h->height;
1105 if (!h->top_qp)
1106 ff_cavs_init_top_lines(h);
1107 return 0;
1108 }
1109
1110 static void cavs_flush(AVCodecContext * avctx)
1111 {
1112 AVSContext *h = avctx->priv_data;
1113 h->got_keyframe = 0;
1114 }
1115
1116 static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1117 AVPacket *avpkt)
1118 {
1119 AVSContext *h = avctx->priv_data;
1120 const uint8_t *buf = avpkt->data;
1121 int buf_size = avpkt->size;
1122 AVFrame *picture = data;
1123 uint32_t stc = -1;
1124 int input_size;
1125 const uint8_t *buf_end;
1126 const uint8_t *buf_ptr;
1127
1128 if (buf_size == 0) {
1129 if (!h->low_delay && h->DPB[0].f->data[0]) {
1130 *got_frame = 1;
1131 *picture = *h->DPB[0].f;
1132 if (h->cur.f->data[0])
1133 avctx->release_buffer(avctx, h->cur.f);
1134 FFSWAP(AVSFrame, h->cur, h->DPB[0]);
1135 }
1136 return 0;
1137 }
1138
1139 buf_ptr = buf;
1140 buf_end = buf + buf_size;
1141 for(;;) {
1142 buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &stc);
1143 if ((stc & 0xFFFFFE00) || buf_ptr == buf_end)
1144 return FFMAX(0, buf_ptr - buf);
1145 input_size = (buf_end - buf_ptr) * 8;
1146 switch (stc) {
1147 case CAVS_START_CODE:
1148 init_get_bits(&h->gb, buf_ptr, input_size);
1149 decode_seq_header(h);
1150 break;
1151 case PIC_I_START_CODE:
1152 if (!h->got_keyframe) {
1153 if(h->DPB[0].f->data[0])
1154 avctx->release_buffer(avctx, h->DPB[0].f);
1155 if(h->DPB[1].f->data[0])
1156 avctx->release_buffer(avctx, h->DPB[1].f);
1157 h->got_keyframe = 1;
1158 }
1159 case PIC_PB_START_CODE:
1160 *got_frame = 0;
1161 if (!h->got_keyframe)
1162 break;
1163 init_get_bits(&h->gb, buf_ptr, input_size);
1164 h->stc = stc;
1165 if (decode_pic(h))
1166 break;
1167 *got_frame = 1;
1168 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1169 if (h->DPB[1].f->data[0]) {
1170 *picture = *h->DPB[1].f;
1171 } else {
1172 *got_frame = 0;
1173 }
1174 } else
1175 *picture = *h->cur.f;
1176 break;
1177 case EXT_START_CODE:
1178 //mpeg_decode_extension(avctx, buf_ptr, input_size);
1179 break;
1180 case USER_START_CODE:
1181 //mpeg_decode_user_data(avctx, buf_ptr, input_size);
1182 break;
1183 default:
1184 if (stc <= SLICE_MAX_START_CODE) {
1185 init_get_bits(&h->gb, buf_ptr, input_size);
1186 decode_slice_header(h, &h->gb);
1187 }
1188 break;
1189 }
1190 }
1191 }
1192
1193 AVCodec ff_cavs_decoder = {
1194 .name = "cavs",
1195 .type = AVMEDIA_TYPE_VIDEO,
1196 .id = AV_CODEC_ID_CAVS,
1197 .priv_data_size = sizeof(AVSContext),
1198 .init = ff_cavs_init,
1199 .close = ff_cavs_end,
1200 .decode = cavs_decode_frame,
1201 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
1202 .flush = cavs_flush,
1203 .long_name = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
1204 };