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path: root/libavcodec/cavsdec.c (plain)
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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 FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 "libavutil/avassert.h"
29#include "avcodec.h"
30#include "get_bits.h"
31#include "golomb.h"
32#include "cavs.h"
33#include "internal.h"
34#include "mpeg12data.h"
35
36static const uint8_t mv_scan[4] = {
37 MV_FWD_X0, MV_FWD_X1,
38 MV_FWD_X2, MV_FWD_X3
39};
40
41static 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
52static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
53
54static const uint8_t dequant_shift[64] = {
55 14, 14, 14, 14, 14, 14, 14, 14,
56 13, 13, 13, 13, 13, 13, 13, 13,
57 13, 12, 12, 12, 12, 12, 12, 12,
58 11, 11, 11, 11, 11, 11, 11, 11,
59 11, 10, 10, 10, 10, 10, 10, 10,
60 10, 9, 9, 9, 9, 9, 9, 9,
61 9, 8, 8, 8, 8, 8, 8, 8,
62 7, 7, 7, 7, 7, 7, 7, 7
63};
64
65static const uint16_t dequant_mul[64] = {
66 32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
67 32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
68 65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
69 32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
70 65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
71 65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
72 65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
73 32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
74};
75
76#define EOB 0, 0, 0
77
78static const struct dec_2dvlc intra_dec[7] = {
79 {
80 { //level / run / table_inc
81 { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
82 { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
83 { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
84 { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 2, 1, 2 }, { -2, 1, 2 },
85 { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
86 { 1, 15, 1 }, { -1, 15, 1 }, { 2, 2, 2 }, { -2, 2, 2 }, { 1, 16, 1 }, { -1, 16, 1 },
87 { 1, 17, 1 }, { -1, 17, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 18, 1 }, { -1, 18, 1 },
88 { 1, 19, 1 }, { -1, 19, 1 }, { 2, 3, 2 }, { -2, 3, 2 }, { 1, 20, 1 }, { -1, 20, 1 },
89 { 1, 21, 1 }, { -1, 21, 1 }, { 2, 4, 2 }, { -2, 4, 2 }, { 1, 22, 1 }, { -1, 22, 1 },
90 { 2, 5, 2 }, { -2, 5, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { EOB }
91 },
92 //level_add
93 { 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 },
94 2, //golomb_order
95 0, //inc_limit
96 23, //max_run
97 },
98 {
99 { //level / run
100 { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 }, { -2, 1, 1 },
101 { 1, 3, 0 }, { -1, 3, 0 }, { EOB }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
102 { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 2, 2, 1 },
103 { -2, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 1, 9, 0 },
104 { -1, 9, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 4, 1, 2 }, { -4, 1, 2 }, { 1, 10, 0 },
105 { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 3, 2, 2 },
106 { -3, 2, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 5, 1, 3 },
107 { -5, 1, 3 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 14, 0 },
108 { -1, 14, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 2, 8, 1 }, { -2, 8, 1 }, { 3, 3, 2 },
109 { -3, 3, 2 }, { 6, 1, 3 }, { -6, 1, 3 }, { 1, 15, 0 }, { -1, 15, 0 }
110 },
111 //level_add
112 { 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 },
113 2, //golomb_order
114 1, //inc_limit
115 15, //max_run
116 },
117 {
118 { //level / run
119 { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 },
120 { 3, 1, 1 }, { -3, 1, 1 }, { EOB }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
121 { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
122 { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
123 { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 2, 4, 0 },
124 { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
125 { -7, 1, 2 }, { 3, 3, 1 }, { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 },
126 { -1, 8, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 3 }, { -8, 1, 3 }, { 1, 9, 0 },
127 { -1, 9, 0 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 }, { 2, 7, 0 },
128 { -2, 7, 0 }, { 9, 1, 3 }, { -9, 1, 3 }, { 1, 10, 0 }, { -1, 10, 0 }
129 },
130 //level_add
131 { 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 },
132 2, //golomb_order
133 2, //inc_limit
134 10, //max_run
135 },
136 {
137 { //level / run
138 { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
139 { 1, 2, 0 }, { -1, 2, 0 }, { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 1 },
140 { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 1 },
141 { -6, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
142 { -1, 4, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
143 { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 5, 2, 1 },
144 { -5, 2, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 10, 1, 2 }, {-10, 1, 2 }, { 3, 3, 0 },
145 { -3, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 11, 1, 3 }, {-11, 1, 3 }, { 6, 2, 1 },
146 { -6, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 5, 0 }, { -2, 5, 0 }, { 3, 4, 0 },
147 { -3, 4, 0 }, { 12, 1, 3 }, {-12, 1, 3 }, { 4, 3, 0 }, { -4, 3, 0 }
148 },
149 //level_add
150 { 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 },
151 2, //golomb_order
152 4, //inc_limit
153 7, //max_run
154 },
155 {
156 { //level / run
157 { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
158 { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
159 { -6, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 1 },
160 { -8, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 10, 1, 1 },
161 {-10, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 2 },
162 {-11, 1, 2 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 13, 1, 2 },
163 {-13, 1, 2 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 },
164 { -2, 3, 0 }, { 14, 1, 2 }, {-14, 1, 2 }, { 6, 2, 0 }, { -6, 2, 0 }, { 15, 1, 2 },
165 {-15, 1, 2 }, { 16, 1, 2 }, {-16, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 5, 0 },
166 { -1, 5, 0 }, { 7, 2, 0 }, { -7, 2, 0 }, { 17, 1, 2 }, {-17, 1, 2 }
167 },
168 //level_add
169 { 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 },
170 2, //golomb_order
171 7, //inc_limit
172 5, //max_run
173 },
174 {
175 { //level / run
176 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
177 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
178 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
179 { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 11, 1, 1 },
180 {-11, 1, 1 }, { 12, 1, 1 }, {-12, 1, 1 }, { 13, 1, 1 }, {-13, 1, 1 }, { 2, 2, 0 },
181 { -2, 2, 0 }, { 14, 1, 1 }, {-14, 1, 1 }, { 15, 1, 1 }, {-15, 1, 1 }, { 3, 2, 0 },
182 { -3, 2, 0 }, { 16, 1, 1 }, {-16, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 17, 1, 1 },
183 {-17, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 18, 1, 1 }, {-18, 1, 1 }, { 5, 2, 0 },
184 { -5, 2, 0 }, { 19, 1, 1 }, {-19, 1, 1 }, { 20, 1, 1 }, {-20, 1, 1 }, { 6, 2, 0 },
185 { -6, 2, 0 }, { 21, 1, 1 }, {-21, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }
186 },
187 //level_add
188 { 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 },
189 2, //golomb_order
190 10, //inc_limit
191 3, //max_run
192 },
193 {
194 { //level / run
195 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
196 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
197 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
198 { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 11, 1, 0 }, {-11, 1, 0 }, { 12, 1, 0 },
199 {-12, 1, 0 }, { 13, 1, 0 }, {-13, 1, 0 }, { 14, 1, 0 }, {-14, 1, 0 }, { 15, 1, 0 },
200 {-15, 1, 0 }, { 16, 1, 0 }, {-16, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 17, 1, 0 },
201 {-17, 1, 0 }, { 18, 1, 0 }, {-18, 1, 0 }, { 19, 1, 0 }, {-19, 1, 0 }, { 20, 1, 0 },
202 {-20, 1, 0 }, { 21, 1, 0 }, {-21, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 22, 1, 0 },
203 {-22, 1, 0 }, { 23, 1, 0 }, {-23, 1, 0 }, { 24, 1, 0 }, {-24, 1, 0 }, { 25, 1, 0 },
204 {-25, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 26, 1, 0 }, {-26, 1, 0 }
205 },
206 //level_add
207 { 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 },
208 2, //golomb_order
209 INT_MAX, //inc_limit
210 2, //max_run
211 }
212};
213
214static const struct dec_2dvlc inter_dec[7] = {
215 {
216 { //level / run
217 { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
218 { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
219 { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
220 { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 1, 12, 1 }, { -1, 12, 1 },
221 { 1, 13, 1 }, { -1, 13, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 14, 1 }, { -1, 14, 1 },
222 { 1, 15, 1 }, { -1, 15, 1 }, { 1, 16, 1 }, { -1, 16, 1 }, { 1, 17, 1 }, { -1, 17, 1 },
223 { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 }, { 3, 1, 3 }, { -3, 1, 3 },
224 { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 2, 2, 2 }, { -2, 2, 2 },
225 { 1, 22, 1 }, { -1, 22, 1 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
226 { 1, 25, 1 }, { -1, 25, 1 }, { 1, 26, 1 }, { -1, 26, 1 }, { EOB }
227 },
228 //level_add
229 { 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 },
230 3, //golomb_order
231 0, //inc_limit
232 26 //max_run
233 },
234 {
235 { //level / run
236 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 1, 3, 0 },
237 { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
238 { -1, 6, 0 }, { 2, 1, 1 }, { -2, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 },
239 { -1, 8, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 2, 2, 1 },
240 { -2, 2, 1 }, { 1, 11, 0 }, { -1, 11, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 1, 2 },
241 { -3, 1, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 }, { -1, 14, 0 }, { 2, 3, 1 },
242 { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 1, 16, 0 },
243 { -1, 16, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 1, 17, 0 }, { -1, 17, 0 }, { 4, 1, 3 },
244 { -4, 1, 3 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 18, 0 }, { -1, 18, 0 }, { 1, 19, 0 },
245 { -1, 19, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 3, 2, 2 }, { -3, 2, 2 }
246 },
247 //level_add
248 { 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 },
249 2, //golomb_order
250 1, //inc_limit
251 19 //max_run
252 },
253 {
254 { //level / run
255 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 0 },
256 { -2, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 3, 1, 1 },
257 { -3, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
258 { -1, 6, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 1, 2 },
259 { -4, 1, 2 }, { 1, 8, 0 }, { -1, 8, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 4, 0 },
260 { -2, 4, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 5, 1, 2 },
261 { -5, 1, 2 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 6, 0 },
262 { -2, 6, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 3, 1 }, { -3, 3, 1 }, { 6, 1, 2 },
263 { -6, 1, 2 }, { 4, 2, 2 }, { -4, 2, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 7, 0 },
264 { -2, 7, 0 }, { 3, 4, 1 }, { -3, 4, 1 }, { 1, 14, 0 }, { -1, 14, 0 }
265 },
266 //level_add
267 { 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 },
268 2, //golomb_order
269 2, //inc_limit
270 14 //max_run
271 },
272 {
273 { //level / run
274 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
275 { -1, 2, 0 }, { 3, 1, 0 }, { -3, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
276 { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 1 },
277 { -5, 1, 1 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 2, 3, 0 },
278 { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 2, 4, 0 },
279 { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
280 { -7, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 5, 0 },
281 { -2, 5, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 4, 0 },
282 { -3, 4, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 1, 10, 0 },
283 { -1, 10, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 4, 3, 1 }, { -4, 3, 1 }
284 },
285 //level_add
286 { 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 },
287 2, //golomb_order
288 3, //inc_limit
289 10 //max_run
290 },
291 {
292 { //level / run
293 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
294 { -3, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 },
295 { -5, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 0 },
296 { -6, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
297 { -1, 4, 0 }, { 8, 1, 1 }, { -8, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
298 { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 5, 2, 0 },
299 { -5, 2, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 10, 1, 2 },
300 {-10, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 11, 1, 2 }, {-11, 1, 2 }, { 1, 7, 0 },
301 { -1, 7, 0 }, { 6, 2, 0 }, { -6, 2, 0 }, { 3, 4, 0 }, { -3, 4, 0 }, { 2, 5, 0 },
302 { -2, 5, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 4, 3, 0 }, { -4, 3, 0 }
303 },
304 //level_add
305 { 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 },
306 2, //golomb_order
307 6, //inc_limit
308 7 //max_run
309 },
310 {
311 { //level / run
312 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
313 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 1, 2, 0 },
314 { -1, 2, 0 }, { 6, 1, 0 }, { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 },
315 { -8, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 1, 3, 0 },
316 { -1, 3, 0 }, { 10, 1, 1 }, { -10, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 1 },
317 { -11, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 1 }, { -12, 1, 1 }, { 1, 4, 0 },
318 { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 13, 1, 1 }, { -13, 1, 1 }, { 5, 2, 0 },
319 { -5, 2, 0 }, { 14, 1, 1 }, { -14, 1, 1 }, { 6, 2, 0 }, { -6, 2, 0 }, { 1, 5, 0 },
320 { -1, 5, 0 }, { 15, 1, 1 }, { -15, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 16, 1, 1 },
321 { -16, 1, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 2, 0 }, { -7, 2, 0 }
322 },
323 //level_add
324 { 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 },
325 2, //golomb_order
326 9, //inc_limit
327 5 //max_run
328 },
329 {
330 { //level / run
331 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
332 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
333 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 8, 1, 0 },
334 { -8, 1, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
335 { -11, 1, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 13, 1, 0 },
336 { -13, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 15, 1, 0 },
337 { -15, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 16, 1, 0 }, { -16, 1, 0 }, { 17, 1, 0 },
338 { -17, 1, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 19, 1, 0 },
339 { -19, 1, 0 }, { 20, 1, 0 }, { -20, 1, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 1, 4, 0 },
340 { -1, 4, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 21, 1, 0 }, { -21, 1, 0 }
341 },
342 //level_add
343 { 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 },
344 2, //golomb_order
345 INT_MAX, //inc_limit
346 4 //max_run
347 }
348};
349
350static const struct dec_2dvlc chroma_dec[5] = {
351 {
352 { //level / run
353 { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
354 { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
355 { 1, 7, 1 }, { -1, 7, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 8, 1 }, { -1, 8, 1 },
356 { 1, 9, 1 }, { -1, 9, 1 }, { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 },
357 { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
358 { 1, 15, 1 }, { -1, 15, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 16, 1 }, { -1, 16, 1 },
359 { 1, 17, 1 }, { -1, 17, 1 }, { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 },
360 { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 1, 22, 1 }, { -1, 22, 1 },
361 { 2, 2, 2 }, { -2, 2, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
362 { 1, 25, 1 }, { -1, 25, 1 }, { 4, 1, 3 }, { -4, 1, 3 }, { EOB }
363 },
364 //level_add
365 { 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 },
366 2, //golomb_order
367 0, //inc_limit
368 25 //max_run
369 },
370 {
371 { //level / run
372 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 },
373 { -2, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
374 { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 1, 7, 0 },
375 { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 2, 1 }, { -2, 2, 1 }, { 1, 9, 0 },
376 { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 4, 1, 2 },
377 { -4, 1, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 },
378 { -1, 14, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 },
379 { -2, 4, 1 }, { 5, 1, 3 }, { -5, 1, 3 }, { 3, 2, 2 }, { -3, 2, 2 }, { 1, 16, 0 },
380 { -1, 16, 0 }, { 1, 17, 0 }, { -1, 17, 0 }, { 1, 18, 0 }, { -1, 18, 0 }, { 2, 5, 1 },
381 { -2, 5, 1 }, { 1, 19, 0 }, { -1, 19, 0 }, { 1, 20, 0 }, { -1, 20, 0 }
382 },
383 //level_add
384 { 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 },
385 0, //golomb_order
386 1, //inc_limit
387 20 //max_run
388 },
389 {
390 { //level / run
391 { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
392 { -1, 2, 0 }, { 3, 1, 1 }, { -3, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 4, 1, 1 },
393 { -4, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
394 { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
395 { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 1, 7, 0 },
396 { -1, 7, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 1, 2 }, { -7, 1, 2 }, { 1, 8, 0 },
397 { -1, 8, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 3, 1 },
398 { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 2 },
399 { -8, 1, 2 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 9, 1, 2 },
400 { -9, 1, 2 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 },
401 },
402 //level_add
403 { 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 },
404 1, //golomb_order
405 2, //inc_limit
406 11 //max_run
407 },
408 {
409 { //level / run
410 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
411 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 5, 1, 1 },
412 { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 1, 3, 0 },
413 { -1, 3, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 8, 1, 1 },
414 { -8, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 9, 1, 1 },
415 { -9, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 10, 1, 1 },
416 {-10, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 2, 4, 0 },
417 { -2, 4, 0 }, { 11, 1, 1 }, {-11, 1, 1 }, { 1, 6, 0 }, { -1, 6, 0 }, { 12, 1, 1 },
418 {-12, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 6, 2, 1 }, { -6, 2, 1 }, { 13, 1, 1 },
419 {-13, 1, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 }, { -1, 8, 0 },
420 },
421 //level_add
422 { 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 },
423 1, //golomb_order
424 4, //inc_limit
425 8 //max_run
426 },
427 {
428 { //level / run
429 { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
430 { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
431 { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 1, 2, 0 },
432 { -1, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
433 { -11, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 13, 1, 0 },
434 { -13, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 1, 3, 0 },
435 { -1, 3, 0 }, { 15, 1, 0 }, { -15, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 16, 1, 0 },
436 { -16, 1, 0 }, { 17, 1, 0 }, { -17, 1, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 },
437 { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 6, 2, 0 },
438 { -6, 2, 0 }, { 19, 1, 0 }, { -19, 1, 0 }, { 1, 5, 0 }, { -1, 5, 0 },
439 },
440 //level_add
441 { 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 },
442 0, //golomb_order
443 INT_MAX, //inc_limit
444 5, //max_run
445 }
446};
447
448#undef EOB
449
450/*****************************************************************************
451 *
452 * motion vector prediction
453 *
454 ****************************************************************************/
455
456static inline void store_mvs(AVSContext *h)
457{
458 h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
459 h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
460 h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
461 h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
462}
463
464static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
465 cavs_vector *col_mv)
466{
467 cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
468 int den = h->direct_den[col_mv->ref];
469 int m = FF_SIGNBIT(col_mv->x);
470
471 pmv_fw->dist = h->dist[1];
472 pmv_bw->dist = h->dist[0];
473 pmv_fw->ref = 1;
474 pmv_bw->ref = 0;
475 /* scale the co-located motion vector according to its temporal span */
476 pmv_fw->x = (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
477 pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
478 m = FF_SIGNBIT(col_mv->y);
479 pmv_fw->y = (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
480 pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
481}
482
483static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
484 enum cavs_block size)
485{
486 cavs_vector *dst = src + MV_BWD_OFFS;
487
488 /* backward mv is the scaled and negated forward mv */
489 dst->x = -((src->x * h->sym_factor + 256) >> 9);
490 dst->y = -((src->y * h->sym_factor + 256) >> 9);
491 dst->ref = 0;
492 dst->dist = h->dist[0];
493 set_mvs(dst, size);
494}
495
496/*****************************************************************************
497 *
498 * residual data decoding
499 *
500 ****************************************************************************/
501
502/** kth-order exponential golomb code */
503static inline int get_ue_code(GetBitContext *gb, int order)
504{
505 unsigned ret = get_ue_golomb(gb);
506 if (ret >= ((1U<<31)>>order)) {
507 av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too larger\n");
508 return AVERROR_INVALIDDATA;
509 }
510 if (order) {
511 return (ret<<order) + get_bits(gb, order);
512 }
513 return ret;
514}
515
516static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
517 int16_t *dst, int mul, int shift, int coeff_num)
518{
519 int round = 1 << (shift - 1);
520 int pos = -1;
521 const uint8_t *scantab = h->scantable.permutated;
522
523 /* inverse scan and dequantization */
524 while (--coeff_num >= 0) {
525 pos += run_buf[coeff_num];
526 if (pos > 63) {
527 av_log(h->avctx, AV_LOG_ERROR,
528 "position out of block bounds at pic %d MB(%d,%d)\n",
529 h->cur.poc, h->mbx, h->mby);
530 return AVERROR_INVALIDDATA;
531 }
532 dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
533 }
534 return 0;
535}
536
537/**
538 * decode coefficients from one 8x8 block, dequantize, inverse transform
539 * and add them to sample block
540 * @param r pointer to 2D VLC table
541 * @param esc_golomb_order escape codes are k-golomb with this order k
542 * @param qp quantizer
543 * @param dst location of sample block
544 * @param stride line stride in frame buffer
545 */
546static int decode_residual_block(AVSContext *h, GetBitContext *gb,
547 const struct dec_2dvlc *r, int esc_golomb_order,
548 int qp, uint8_t *dst, ptrdiff_t stride)
549{
550 int i, esc_code, level, mask, ret;
551 unsigned int level_code, run;
552 int16_t level_buf[65];
553 uint8_t run_buf[65];
554 int16_t *block = h->block;
555
556 for (i = 0; i < 65; i++) {
557 level_code = get_ue_code(gb, r->golomb_order);
558 if (level_code >= ESCAPE_CODE) {
559 run = ((level_code - ESCAPE_CODE) >> 1) + 1;
560 if(run > 64) {
561 av_log(h->avctx, AV_LOG_ERROR, "run %d is too large\n", run);
562 return AVERROR_INVALIDDATA;
563 }
564 esc_code = get_ue_code(gb, esc_golomb_order);
565 if (esc_code < 0 || esc_code > 32767) {
566 av_log(h->avctx, AV_LOG_ERROR, "esc_code invalid\n");
567 return AVERROR_INVALIDDATA;
568 }
569
570 level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
571 while (level > r->inc_limit)
572 r++;
573 mask = -(level_code & 1);
574 level = (level ^ mask) - mask;
575 } else {
576 level = r->rltab[level_code][0];
577 if (!level) //end of block signal
578 break;
579 run = r->rltab[level_code][1];
580 r += r->rltab[level_code][2];
581 }
582 level_buf[i] = level;
583 run_buf[i] = run;
584 }
585 if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
586 dequant_shift[qp], i)) < 0)
587 return ret;
588 h->cdsp.cavs_idct8_add(dst, block, stride);
589 h->bdsp.clear_block(block);
590 return 0;
591}
592
593
594static inline void decode_residual_chroma(AVSContext *h)
595{
596 if (h->cbp & (1 << 4))
597 decode_residual_block(h, &h->gb, chroma_dec, 0,
598 ff_cavs_chroma_qp[h->qp], h->cu, h->c_stride);
599 if (h->cbp & (1 << 5))
600 decode_residual_block(h, &h->gb, chroma_dec, 0,
601 ff_cavs_chroma_qp[h->qp], h->cv, h->c_stride);
602}
603
604static inline int decode_residual_inter(AVSContext *h)
605{
606 int block;
607
608 /* get coded block pattern */
609 int cbp = get_ue_golomb(&h->gb);
610 if (cbp > 63U) {
611 av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp %d\n", cbp);
612 return AVERROR_INVALIDDATA;
613 }
614 h->cbp = cbp_tab[cbp][1];
615
616 /* get quantizer */
617 if (h->cbp && !h->qp_fixed)
618 h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;
619 for (block = 0; block < 4; block++)
620 if (h->cbp & (1 << block))
621 decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
622 h->cy + h->luma_scan[block], h->l_stride);
623 decode_residual_chroma(h);
624
625 return 0;
626}
627
628/*****************************************************************************
629 *
630 * macroblock level
631 *
632 ****************************************************************************/
633
634static inline void set_mv_intra(AVSContext *h)
635{
636 h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
637 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
638 h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
639 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
640 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
641 h->col_type_base[h->mbidx] = I_8X8;
642}
643
644static int decode_mb_i(AVSContext *h, int cbp_code)
645{
646 GetBitContext *gb = &h->gb;
647 unsigned pred_mode_uv;
648 int block;
649 uint8_t top[18];
650 uint8_t *left = NULL;
651 uint8_t *d;
652
653 ff_cavs_init_mb(h);
654
655 /* get intra prediction modes from stream */
656 for (block = 0; block < 4; block++) {
657 int nA, nB, predpred;
658 int pos = scan3x3[block];
659
660 nA = h->pred_mode_Y[pos - 1];
661 nB = h->pred_mode_Y[pos - 3];
662 predpred = FFMIN(nA, nB);
663 if (predpred == NOT_AVAIL) // if either is not available
664 predpred = INTRA_L_LP;
665 if (!get_bits1(gb)) {
666 int rem_mode = get_bits(gb, 2);
667 predpred = rem_mode + (rem_mode >= predpred);
668 }
669 h->pred_mode_Y[pos] = predpred;
670 }
671 pred_mode_uv = get_ue_golomb(gb);
672 if (pred_mode_uv > 6) {
673 av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
674 return AVERROR_INVALIDDATA;
675 }
676 ff_cavs_modify_mb_i(h, &pred_mode_uv);
677
678 /* get coded block pattern */
679 if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
680 cbp_code = get_ue_golomb(gb);
681 if (cbp_code > 63U) {
682 av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
683 return AVERROR_INVALIDDATA;
684 }
685 h->cbp = cbp_tab[cbp_code][0];
686 if (h->cbp && !h->qp_fixed)
687 h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
688
689 /* luma intra prediction interleaved with residual decode/transform/add */
690 for (block = 0; block < 4; block++) {
691 d = h->cy + h->luma_scan[block];
692 ff_cavs_load_intra_pred_luma(h, top, &left, block);
693 h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
694 (d, top, left, h->l_stride);
695 if (h->cbp & (1<<block))
696 decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
697 }
698
699 /* chroma intra prediction */
700 ff_cavs_load_intra_pred_chroma(h);
701 h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
702 h->left_border_u, h->c_stride);
703 h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
704 h->left_border_v, h->c_stride);
705
706 decode_residual_chroma(h);
707 ff_cavs_filter(h, I_8X8);
708 set_mv_intra(h);
709 return 0;
710}
711
712static inline void set_intra_mode_default(AVSContext *h)
713{
714 if (h->stream_revision > 0) {
715 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
716 h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
717 } else {
718 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
719 h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
720 }
721}
722
723static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
724{
725 GetBitContext *gb = &h->gb;
726 int ref[4];
727
728 ff_cavs_init_mb(h);
729 switch (mb_type) {
730 case P_SKIP:
731 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
732 break;
733 case P_16X16:
734 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
735 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
736 break;
737 case P_16X8:
738 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
739 ref[2] = h->ref_flag ? 0 : get_bits1(gb);
740 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
741 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
742 break;
743 case P_8X16:
744 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
745 ref[1] = h->ref_flag ? 0 : get_bits1(gb);
746 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
747 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
748 break;
749 case P_8X8:
750 ref[0] = h->ref_flag ? 0 : get_bits1(gb);
751 ref[1] = h->ref_flag ? 0 : get_bits1(gb);
752 ref[2] = h->ref_flag ? 0 : get_bits1(gb);
753 ref[3] = h->ref_flag ? 0 : get_bits1(gb);
754 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
755 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
756 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
757 ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
758 }
759 ff_cavs_inter(h, mb_type);
760 set_intra_mode_default(h);
761 store_mvs(h);
762 if (mb_type != P_SKIP)
763 decode_residual_inter(h);
764 ff_cavs_filter(h, mb_type);
765 h->col_type_base[h->mbidx] = mb_type;
766}
767
768static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
769{
770 int block;
771 enum cavs_sub_mb sub_type[4];
772 int flags;
773
774 ff_cavs_init_mb(h);
775
776 /* reset all MVs */
777 h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
778 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
779 h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
780 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
781 switch (mb_type) {
782 case B_SKIP:
783 case B_DIRECT:
784 if (!h->col_type_base[h->mbidx]) {
785 /* intra MB at co-location, do in-plane prediction */
786 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
787 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
788 } else
789 /* direct prediction from co-located P MB, block-wise */
790 for (block = 0; block < 4; block++)
791 mv_pred_direct(h, &h->mv[mv_scan[block]],
792 &h->col_mv[h->mbidx * 4 + block]);
793 break;
794 case B_FWD_16X16:
795 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
796 break;
797 case B_SYM_16X16:
798 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
799 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
800 break;
801 case B_BWD_16X16:
802 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
803 break;
804 case B_8X8:
805#define TMP_UNUSED_INX 7
806 flags = 0;
807 for (block = 0; block < 4; block++)
808 sub_type[block] = get_bits(&h->gb, 2);
809 for (block = 0; block < 4; block++) {
810 switch (sub_type[block]) {
811 case B_SUB_DIRECT:
812 if (!h->col_type_base[h->mbidx]) {
813 /* intra MB at co-location, do in-plane prediction */
814 if(flags==0) {
815 // if col-MB is a Intra MB, current Block size is 16x16.
816 // AVS standard section 9.9.1
817 if(block>0){
818 h->mv[TMP_UNUSED_INX ] = h->mv[MV_FWD_X0 ];
819 h->mv[TMP_UNUSED_INX + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
820 }
821 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2,
822 MV_PRED_BSKIP, BLK_8X8, 1);
823 ff_cavs_mv(h, MV_FWD_X0+MV_BWD_OFFS,
824 MV_FWD_C2+MV_BWD_OFFS,
825 MV_PRED_BSKIP, BLK_8X8, 0);
826 if(block>0) {
827 flags = mv_scan[block];
828 h->mv[flags ] = h->mv[MV_FWD_X0 ];
829 h->mv[flags + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
830 h->mv[MV_FWD_X0 ] = h->mv[TMP_UNUSED_INX ];
831 h->mv[MV_FWD_X0 + MV_BWD_OFFS] = h->mv[TMP_UNUSED_INX + MV_BWD_OFFS];
832 } else
833 flags = MV_FWD_X0;
834 } else {
835 h->mv[mv_scan[block] ] = h->mv[flags ];
836 h->mv[mv_scan[block] + MV_BWD_OFFS] = h->mv[flags + MV_BWD_OFFS];
837 }
838 } else
839 mv_pred_direct(h, &h->mv[mv_scan[block]],
840 &h->col_mv[h->mbidx * 4 + block]);
841 break;
842 case B_SUB_FWD:
843 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
844 MV_PRED_MEDIAN, BLK_8X8, 1);
845 break;
846 case B_SUB_SYM:
847 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
848 MV_PRED_MEDIAN, BLK_8X8, 1);
849 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
850 break;
851 }
852 }
853#undef TMP_UNUSED_INX
854 for (block = 0; block < 4; block++) {
855 if (sub_type[block] == B_SUB_BWD)
856 ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
857 mv_scan[block] + MV_BWD_OFFS - 3,
858 MV_PRED_MEDIAN, BLK_8X8, 0);
859 }
860 break;
861 default:
862 if (mb_type <= B_SYM_16X16) {
863 av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);
864 return AVERROR_INVALIDDATA;
865 }
866 av_assert2(mb_type < B_8X8);
867 flags = ff_cavs_partition_flags[mb_type];
868 if (mb_type & 1) { /* 16x8 macroblock types */
869 if (flags & FWD0)
870 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
871 if (flags & SYM0)
872 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
873 if (flags & FWD1)
874 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
875 if (flags & SYM1)
876 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
877 if (flags & BWD0)
878 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
879 if (flags & BWD1)
880 ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
881 } else { /* 8x16 macroblock types */
882 if (flags & FWD0)
883 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
884 if (flags & SYM0)
885 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
886 if (flags & FWD1)
887 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
888 if (flags & SYM1)
889 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
890 if (flags & BWD0)
891 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
892 if (flags & BWD1)
893 ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
894 }
895 }
896 ff_cavs_inter(h, mb_type);
897 set_intra_mode_default(h);
898 if (mb_type != B_SKIP)
899 decode_residual_inter(h);
900 ff_cavs_filter(h, mb_type);
901
902 return 0;
903}
904
905/*****************************************************************************
906 *
907 * slice level
908 *
909 ****************************************************************************/
910
911static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
912{
913 if (h->stc > 0xAF)
914 av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
915
916 if (h->stc >= h->mb_height) {
917 av_log(h->avctx, AV_LOG_ERROR, "stc 0x%02x is too large\n", h->stc);
918 return AVERROR_INVALIDDATA;
919 }
920
921 h->mby = h->stc;
922 h->mbidx = h->mby * h->mb_width;
923
924 /* mark top macroblocks as unavailable */
925 h->flags &= ~(B_AVAIL | C_AVAIL);
926 if (!h->pic_qp_fixed) {
927 h->qp_fixed = get_bits1(gb);
928 h->qp = get_bits(gb, 6);
929 }
930 /* inter frame or second slice can have weighting params */
931 if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
932 (!h->pic_structure && h->mby >= h->mb_width / 2))
933 if (get_bits1(gb)) { //slice_weighting_flag
934 av_log(h->avctx, AV_LOG_ERROR,
935 "weighted prediction not yet supported\n");
936 }
937 return 0;
938}
939
940static inline int check_for_slice(AVSContext *h)
941{
942 GetBitContext *gb = &h->gb;
943 int align;
944
945 if (h->mbx)
946 return 0;
947 align = (-get_bits_count(gb)) & 7;
948 /* check for stuffing byte */
949 if (!align && (show_bits(gb, 8) == 0x80))
950 align = 8;
951 if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
952 skip_bits_long(gb, 24 + align);
953 h->stc = get_bits(gb, 8);
954 if (h->stc >= h->mb_height)
955 return 0;
956 decode_slice_header(h, gb);
957 return 1;
958 }
959 return 0;
960}
961
962/*****************************************************************************
963 *
964 * frame level
965 *
966 ****************************************************************************/
967
968static int decode_pic(AVSContext *h)
969{
970 int ret;
971 int skip_count = -1;
972 enum cavs_mb mb_type;
973
974 if (!h->top_qp) {
975 av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");
976 return AVERROR_INVALIDDATA;
977 }
978
979 av_frame_unref(h->cur.f);
980
981 skip_bits(&h->gb, 16);//bbv_dwlay
982 if (h->stc == PIC_PB_START_CODE) {
983 h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
984 if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
985 av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
986 return AVERROR_INVALIDDATA;
987 }
988 /* make sure we have the reference frames we need */
989 if (!h->DPB[0].f->data[0] ||
990 (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
991 return AVERROR_INVALIDDATA;
992 } else {
993 h->cur.f->pict_type = AV_PICTURE_TYPE_I;
994 if (get_bits1(&h->gb))
995 skip_bits(&h->gb, 24);//time_code
996 /* old sample clips were all progressive and no low_delay,
997 bump stream revision if detected otherwise */
998 if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
999 h->stream_revision = 1;
1000 /* similarly test top_field_first and repeat_first_field */
1001 else if (show_bits(&h->gb, 11) & 3)
1002 h->stream_revision = 1;
1003 if (h->stream_revision > 0)
1004 skip_bits(&h->gb, 1); //marker_bit
1005 }
1006
1007 ret = ff_get_buffer(h->avctx, h->cur.f, h->cur.f->pict_type == AV_PICTURE_TYPE_B ?
1008 0 : AV_GET_BUFFER_FLAG_REF);
1009 if (ret < 0)
1010 return ret;
1011
1012 if (!h->edge_emu_buffer) {
1013 int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
1014 h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
1015 if (!h->edge_emu_buffer)
1016 return AVERROR(ENOMEM);
1017 }
1018
1019 if ((ret = ff_cavs_init_pic(h)) < 0)
1020 return ret;
1021 h->cur.poc = get_bits(&h->gb, 8) * 2;
1022
1023 /* get temporal distances and MV scaling factors */
1024 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1025 h->dist[0] = (h->cur.poc - h->DPB[0].poc) & 511;
1026 } else {
1027 h->dist[0] = (h->DPB[0].poc - h->cur.poc) & 511;
1028 }
1029 h->dist[1] = (h->cur.poc - h->DPB[1].poc) & 511;
1030 h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
1031 h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
1032 if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
1033 h->sym_factor = h->dist[0] * h->scale_den[1];
1034 } else {
1035 h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
1036 h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
1037 }
1038
1039 if (h->low_delay)
1040 get_ue_golomb(&h->gb); //bbv_check_times
1041 h->progressive = get_bits1(&h->gb);
1042 h->pic_structure = 1;
1043 if (!h->progressive)
1044 h->pic_structure = get_bits1(&h->gb);
1045 if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
1046 skip_bits1(&h->gb); //advanced_pred_mode_disable
1047 skip_bits1(&h->gb); //top_field_first
1048 skip_bits1(&h->gb); //repeat_first_field
1049 h->pic_qp_fixed =
1050 h->qp_fixed = get_bits1(&h->gb);
1051 h->qp = get_bits(&h->gb, 6);
1052 if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1053 if (!h->progressive && !h->pic_structure)
1054 skip_bits1(&h->gb);//what is this?
1055 skip_bits(&h->gb, 4); //reserved bits
1056 } else {
1057 if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
1058 h->ref_flag = get_bits1(&h->gb);
1059 skip_bits(&h->gb, 4); //reserved bits
1060 h->skip_mode_flag = get_bits1(&h->gb);
1061 }
1062 h->loop_filter_disable = get_bits1(&h->gb);
1063 if (!h->loop_filter_disable && get_bits1(&h->gb)) {
1064 h->alpha_offset = get_se_golomb(&h->gb);
1065 h->beta_offset = get_se_golomb(&h->gb);
1066 } else {
1067 h->alpha_offset = h->beta_offset = 0;
1068 }
1069 if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1070 do {
1071 check_for_slice(h);
1072 decode_mb_i(h, 0);
1073 } while (ff_cavs_next_mb(h));
1074 } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
1075 do {
1076 if (check_for_slice(h))
1077 skip_count = -1;
1078 if (h->skip_mode_flag && (skip_count < 0))
1079 skip_count = get_ue_golomb(&h->gb);
1080 if (h->skip_mode_flag && skip_count--) {
1081 decode_mb_p(h, P_SKIP);
1082 } else {
1083 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
1084 if (mb_type > P_8X8)
1085 decode_mb_i(h, mb_type - P_8X8 - 1);
1086 else
1087 decode_mb_p(h, mb_type);
1088 }
1089 } while (ff_cavs_next_mb(h));
1090 } else { /* AV_PICTURE_TYPE_B */
1091 do {
1092 if (check_for_slice(h))
1093 skip_count = -1;
1094 if (h->skip_mode_flag && (skip_count < 0))
1095 skip_count = get_ue_golomb(&h->gb);
1096 if (h->skip_mode_flag && skip_count--) {
1097 decode_mb_b(h, B_SKIP);
1098 } else {
1099 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
1100 if (mb_type > B_8X8)
1101 decode_mb_i(h, mb_type - B_8X8 - 1);
1102 else
1103 decode_mb_b(h, mb_type);
1104 }
1105 } while (ff_cavs_next_mb(h));
1106 }
1107 emms_c();
1108 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1109 av_frame_unref(h->DPB[1].f);
1110 FFSWAP(AVSFrame, h->cur, h->DPB[1]);
1111 FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
1112 }
1113 return 0;
1114}
1115
1116/*****************************************************************************
1117 *
1118 * headers and interface
1119 *
1120 ****************************************************************************/
1121
1122static int decode_seq_header(AVSContext *h)
1123{
1124 int frame_rate_code;
1125 int width, height;
1126 int ret;
1127
1128 h->profile = get_bits(&h->gb, 8);
1129 h->level = get_bits(&h->gb, 8);
1130 skip_bits1(&h->gb); //progressive sequence
1131
1132 width = get_bits(&h->gb, 14);
1133 height = get_bits(&h->gb, 14);
1134 if ((h->width || h->height) && (h->width != width || h->height != height)) {
1135 avpriv_report_missing_feature(h->avctx,
1136 "Width/height changing in CAVS");
1137 return AVERROR_PATCHWELCOME;
1138 }
1139 if (width <= 0 || height <= 0) {
1140 av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");
1141 return AVERROR_INVALIDDATA;
1142 }
1143 skip_bits(&h->gb, 2); //chroma format
1144 skip_bits(&h->gb, 3); //sample_precision
1145 h->aspect_ratio = get_bits(&h->gb, 4);
1146 frame_rate_code = get_bits(&h->gb, 4);
1147 if (frame_rate_code == 0 || frame_rate_code > 13) {
1148 av_log(h->avctx, AV_LOG_WARNING,
1149 "frame_rate_code %d is invalid\n", frame_rate_code);
1150 frame_rate_code = 1;
1151 }
1152
1153 skip_bits(&h->gb, 18); //bit_rate_lower
1154 skip_bits1(&h->gb); //marker_bit
1155 skip_bits(&h->gb, 12); //bit_rate_upper
1156 h->low_delay = get_bits1(&h->gb);
1157
1158 ret = ff_set_dimensions(h->avctx, width, height);
1159 if (ret < 0)
1160 return ret;
1161
1162 h->width = width;
1163 h->height = height;
1164 h->mb_width = (h->width + 15) >> 4;
1165 h->mb_height = (h->height + 15) >> 4;
1166 h->avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code];
1167 if (!h->top_qp)
1168 return ff_cavs_init_top_lines(h);
1169 return 0;
1170}
1171
1172static void cavs_flush(AVCodecContext * avctx)
1173{
1174 AVSContext *h = avctx->priv_data;
1175 h->got_keyframe = 0;
1176}
1177
1178static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1179 AVPacket *avpkt)
1180{
1181 AVSContext *h = avctx->priv_data;
1182 const uint8_t *buf = avpkt->data;
1183 int buf_size = avpkt->size;
1184 uint32_t stc = -1;
1185 int input_size, ret;
1186 const uint8_t *buf_end;
1187 const uint8_t *buf_ptr;
1188
1189 if (buf_size == 0) {
1190 if (!h->low_delay && h->DPB[0].f->data[0]) {
1191 *got_frame = 1;
1192 av_frame_move_ref(data, h->DPB[0].f);
1193 }
1194 return 0;
1195 }
1196
1197 h->stc = 0;
1198
1199 buf_ptr = buf;
1200 buf_end = buf + buf_size;
1201 for(;;) {
1202 buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);
1203 if ((stc & 0xFFFFFE00) || buf_ptr == buf_end) {
1204 if (!h->stc)
1205 av_log(h->avctx, AV_LOG_WARNING, "no frame decoded\n");
1206 return FFMAX(0, buf_ptr - buf);
1207 }
1208 input_size = (buf_end - buf_ptr) * 8;
1209 switch (stc) {
1210 case CAVS_START_CODE:
1211 init_get_bits(&h->gb, buf_ptr, input_size);
1212 decode_seq_header(h);
1213 break;
1214 case PIC_I_START_CODE:
1215 if (!h->got_keyframe) {
1216 av_frame_unref(h->DPB[0].f);
1217 av_frame_unref(h->DPB[1].f);
1218 h->got_keyframe = 1;
1219 }
1220 case PIC_PB_START_CODE:
1221 if (*got_frame)
1222 av_frame_unref(data);
1223 *got_frame = 0;
1224 if (!h->got_keyframe)
1225 break;
1226 init_get_bits(&h->gb, buf_ptr, input_size);
1227 h->stc = stc;
1228 if (decode_pic(h))
1229 break;
1230 *got_frame = 1;
1231 if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1232 if (h->DPB[!h->low_delay].f->data[0]) {
1233 if ((ret = av_frame_ref(data, h->DPB[!h->low_delay].f)) < 0)
1234 return ret;
1235 } else {
1236 *got_frame = 0;
1237 }
1238 } else {
1239 av_frame_move_ref(data, h->cur.f);
1240 }
1241 break;
1242 case EXT_START_CODE:
1243 //mpeg_decode_extension(avctx, buf_ptr, input_size);
1244 break;
1245 case USER_START_CODE:
1246 //mpeg_decode_user_data(avctx, buf_ptr, input_size);
1247 break;
1248 default:
1249 if (stc <= SLICE_MAX_START_CODE) {
1250 init_get_bits(&h->gb, buf_ptr, input_size);
1251 decode_slice_header(h, &h->gb);
1252 }
1253 break;
1254 }
1255 }
1256}
1257
1258AVCodec ff_cavs_decoder = {
1259 .name = "cavs",
1260 .long_name = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
1261 .type = AVMEDIA_TYPE_VIDEO,
1262 .id = AV_CODEC_ID_CAVS,
1263 .priv_data_size = sizeof(AVSContext),
1264 .init = ff_cavs_init,
1265 .close = ff_cavs_end,
1266 .decode = cavs_decode_frame,
1267 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
1268 .flush = cavs_flush,
1269};
1270
generated by cgit at 2024-05-17 05:02:09 (GMT)