FFmpeg
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cavsdec.c
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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 #include "mpegvideo.h"
36 
37 static const uint8_t mv_scan[4] = {
38  MV_FWD_X0, MV_FWD_X1,
39  MV_FWD_X2, MV_FWD_X3
40 };
41 
42 static const uint8_t cbp_tab[64][2] = {
43  { 63, 0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, { 0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },
44  { 7, 14 }, { 5, 11 }, { 10, 12 }, { 8, 5 }, { 12, 10 }, { 61, 7 }, { 4, 48 }, { 55, 3 },
45  { 1, 2 }, { 2, 8 }, { 59, 4 }, { 3, 1 }, { 62, 61 }, { 9, 55 }, { 6, 59 }, { 29, 62 },
46  { 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53, 9 }, { 30, 6 },
47  { 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },
48  { 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },
49  { 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },
50  { 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }
51 };
52 
53 static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
54 
55 static const uint8_t dequant_shift[64] = {
56  14, 14, 14, 14, 14, 14, 14, 14,
57  13, 13, 13, 13, 13, 13, 13, 13,
58  13, 12, 12, 12, 12, 12, 12, 12,
59  11, 11, 11, 11, 11, 11, 11, 11,
60  11, 10, 10, 10, 10, 10, 10, 10,
61  10, 9, 9, 9, 9, 9, 9, 9,
62  9, 8, 8, 8, 8, 8, 8, 8,
63  7, 7, 7, 7, 7, 7, 7, 7
64 };
65 
66 static const uint16_t dequant_mul[64] = {
67  32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
68  32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
69  65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
70  32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
71  65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
72  65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
73  65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
74  32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
75 };
76 
77 #define EOB 0, 0, 0
78 
79 static const struct dec_2dvlc intra_dec[7] = {
80  {
81  { //level / run / table_inc
82  { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
83  { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
84  { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
85  { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 2, 1, 2 }, { -2, 1, 2 },
86  { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
87  { 1, 15, 1 }, { -1, 15, 1 }, { 2, 2, 2 }, { -2, 2, 2 }, { 1, 16, 1 }, { -1, 16, 1 },
88  { 1, 17, 1 }, { -1, 17, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 18, 1 }, { -1, 18, 1 },
89  { 1, 19, 1 }, { -1, 19, 1 }, { 2, 3, 2 }, { -2, 3, 2 }, { 1, 20, 1 }, { -1, 20, 1 },
90  { 1, 21, 1 }, { -1, 21, 1 }, { 2, 4, 2 }, { -2, 4, 2 }, { 1, 22, 1 }, { -1, 22, 1 },
91  { 2, 5, 2 }, { -2, 5, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { EOB }
92  },
93  //level_add
94  { 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 },
95  2, //golomb_order
96  0, //inc_limit
97  23, //max_run
98  },
99  {
100  { //level / run
101  { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 }, { -2, 1, 1 },
102  { 1, 3, 0 }, { -1, 3, 0 }, { EOB }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
103  { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 2, 2, 1 },
104  { -2, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 1, 9, 0 },
105  { -1, 9, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 4, 1, 2 }, { -4, 1, 2 }, { 1, 10, 0 },
106  { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 3, 2, 2 },
107  { -3, 2, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 5, 1, 3 },
108  { -5, 1, 3 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 14, 0 },
109  { -1, 14, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 2, 8, 1 }, { -2, 8, 1 }, { 3, 3, 2 },
110  { -3, 3, 2 }, { 6, 1, 3 }, { -6, 1, 3 }, { 1, 15, 0 }, { -1, 15, 0 }
111  },
112  //level_add
113  { 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 },
114  2, //golomb_order
115  1, //inc_limit
116  15, //max_run
117  },
118  {
119  { //level / run
120  { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 },
121  { 3, 1, 1 }, { -3, 1, 1 }, { EOB }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
122  { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
123  { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
124  { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 2, 4, 0 },
125  { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
126  { -7, 1, 2 }, { 3, 3, 1 }, { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 },
127  { -1, 8, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 3 }, { -8, 1, 3 }, { 1, 9, 0 },
128  { -1, 9, 0 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 }, { 2, 7, 0 },
129  { -2, 7, 0 }, { 9, 1, 3 }, { -9, 1, 3 }, { 1, 10, 0 }, { -1, 10, 0 }
130  },
131  //level_add
132  { 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 },
133  2, //golomb_order
134  2, //inc_limit
135  10, //max_run
136  },
137  {
138  { //level / run
139  { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
140  { 1, 2, 0 }, { -1, 2, 0 }, { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 1 },
141  { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 1 },
142  { -6, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
143  { -1, 4, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
144  { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 5, 2, 1 },
145  { -5, 2, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 10, 1, 2 }, {-10, 1, 2 }, { 3, 3, 0 },
146  { -3, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 11, 1, 3 }, {-11, 1, 3 }, { 6, 2, 1 },
147  { -6, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 5, 0 }, { -2, 5, 0 }, { 3, 4, 0 },
148  { -3, 4, 0 }, { 12, 1, 3 }, {-12, 1, 3 }, { 4, 3, 0 }, { -4, 3, 0 }
149  },
150  //level_add
151  { 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 },
152  2, //golomb_order
153  4, //inc_limit
154  7, //max_run
155  },
156  {
157  { //level / run
158  { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
159  { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
160  { -6, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 1 },
161  { -8, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 10, 1, 1 },
162  {-10, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 2 },
163  {-11, 1, 2 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 13, 1, 2 },
164  {-13, 1, 2 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 },
165  { -2, 3, 0 }, { 14, 1, 2 }, {-14, 1, 2 }, { 6, 2, 0 }, { -6, 2, 0 }, { 15, 1, 2 },
166  {-15, 1, 2 }, { 16, 1, 2 }, {-16, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 5, 0 },
167  { -1, 5, 0 }, { 7, 2, 0 }, { -7, 2, 0 }, { 17, 1, 2 }, {-17, 1, 2 }
168  },
169  //level_add
170  { 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 },
171  2, //golomb_order
172  7, //inc_limit
173  5, //max_run
174  },
175  {
176  { //level / run
177  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
178  { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
179  { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
180  { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 11, 1, 1 },
181  {-11, 1, 1 }, { 12, 1, 1 }, {-12, 1, 1 }, { 13, 1, 1 }, {-13, 1, 1 }, { 2, 2, 0 },
182  { -2, 2, 0 }, { 14, 1, 1 }, {-14, 1, 1 }, { 15, 1, 1 }, {-15, 1, 1 }, { 3, 2, 0 },
183  { -3, 2, 0 }, { 16, 1, 1 }, {-16, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 17, 1, 1 },
184  {-17, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 18, 1, 1 }, {-18, 1, 1 }, { 5, 2, 0 },
185  { -5, 2, 0 }, { 19, 1, 1 }, {-19, 1, 1 }, { 20, 1, 1 }, {-20, 1, 1 }, { 6, 2, 0 },
186  { -6, 2, 0 }, { 21, 1, 1 }, {-21, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }
187  },
188  //level_add
189  { 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 },
190  2, //golomb_order
191  10, //inc_limit
192  3, //max_run
193  },
194  {
195  { //level / run
196  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
197  { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
198  { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
199  { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 11, 1, 0 }, {-11, 1, 0 }, { 12, 1, 0 },
200  {-12, 1, 0 }, { 13, 1, 0 }, {-13, 1, 0 }, { 14, 1, 0 }, {-14, 1, 0 }, { 15, 1, 0 },
201  {-15, 1, 0 }, { 16, 1, 0 }, {-16, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 17, 1, 0 },
202  {-17, 1, 0 }, { 18, 1, 0 }, {-18, 1, 0 }, { 19, 1, 0 }, {-19, 1, 0 }, { 20, 1, 0 },
203  {-20, 1, 0 }, { 21, 1, 0 }, {-21, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 22, 1, 0 },
204  {-22, 1, 0 }, { 23, 1, 0 }, {-23, 1, 0 }, { 24, 1, 0 }, {-24, 1, 0 }, { 25, 1, 0 },
205  {-25, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 26, 1, 0 }, {-26, 1, 0 }
206  },
207  //level_add
208  { 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 },
209  2, //golomb_order
210  INT_MAX, //inc_limit
211  2, //max_run
212  }
213 };
214 
215 static const struct dec_2dvlc inter_dec[7] = {
216  {
217  { //level / run
218  { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
219  { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
220  { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
221  { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 1, 12, 1 }, { -1, 12, 1 },
222  { 1, 13, 1 }, { -1, 13, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 14, 1 }, { -1, 14, 1 },
223  { 1, 15, 1 }, { -1, 15, 1 }, { 1, 16, 1 }, { -1, 16, 1 }, { 1, 17, 1 }, { -1, 17, 1 },
224  { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 }, { 3, 1, 3 }, { -3, 1, 3 },
225  { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 2, 2, 2 }, { -2, 2, 2 },
226  { 1, 22, 1 }, { -1, 22, 1 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
227  { 1, 25, 1 }, { -1, 25, 1 }, { 1, 26, 1 }, { -1, 26, 1 }, { EOB }
228  },
229  //level_add
230  { 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 },
231  3, //golomb_order
232  0, //inc_limit
233  26 //max_run
234  },
235  {
236  { //level / run
237  { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 1, 3, 0 },
238  { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
239  { -1, 6, 0 }, { 2, 1, 1 }, { -2, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 },
240  { -1, 8, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 2, 2, 1 },
241  { -2, 2, 1 }, { 1, 11, 0 }, { -1, 11, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 1, 2 },
242  { -3, 1, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 }, { -1, 14, 0 }, { 2, 3, 1 },
243  { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 1, 16, 0 },
244  { -1, 16, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 1, 17, 0 }, { -1, 17, 0 }, { 4, 1, 3 },
245  { -4, 1, 3 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 18, 0 }, { -1, 18, 0 }, { 1, 19, 0 },
246  { -1, 19, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 3, 2, 2 }, { -3, 2, 2 }
247  },
248  //level_add
249  { 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 },
250  2, //golomb_order
251  1, //inc_limit
252  19 //max_run
253  },
254  {
255  { //level / run
256  { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 0 },
257  { -2, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 3, 1, 1 },
258  { -3, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
259  { -1, 6, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 1, 2 },
260  { -4, 1, 2 }, { 1, 8, 0 }, { -1, 8, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 4, 0 },
261  { -2, 4, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 5, 1, 2 },
262  { -5, 1, 2 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 6, 0 },
263  { -2, 6, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 3, 1 }, { -3, 3, 1 }, { 6, 1, 2 },
264  { -6, 1, 2 }, { 4, 2, 2 }, { -4, 2, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 7, 0 },
265  { -2, 7, 0 }, { 3, 4, 1 }, { -3, 4, 1 }, { 1, 14, 0 }, { -1, 14, 0 }
266  },
267  //level_add
268  { 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 },
269  2, //golomb_order
270  2, //inc_limit
271  14 //max_run
272  },
273  {
274  { //level / run
275  { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
276  { -1, 2, 0 }, { 3, 1, 0 }, { -3, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
277  { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 1 },
278  { -5, 1, 1 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 2, 3, 0 },
279  { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 2, 4, 0 },
280  { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
281  { -7, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 5, 0 },
282  { -2, 5, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 4, 0 },
283  { -3, 4, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 1, 10, 0 },
284  { -1, 10, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 4, 3, 1 }, { -4, 3, 1 }
285  },
286  //level_add
287  { 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 },
288  2, //golomb_order
289  3, //inc_limit
290  10 //max_run
291  },
292  {
293  { //level / run
294  { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
295  { -3, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 },
296  { -5, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 0 },
297  { -6, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
298  { -1, 4, 0 }, { 8, 1, 1 }, { -8, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
299  { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 5, 2, 0 },
300  { -5, 2, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 10, 1, 2 },
301  {-10, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 11, 1, 2 }, {-11, 1, 2 }, { 1, 7, 0 },
302  { -1, 7, 0 }, { 6, 2, 0 }, { -6, 2, 0 }, { 3, 4, 0 }, { -3, 4, 0 }, { 2, 5, 0 },
303  { -2, 5, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 4, 3, 0 }, { -4, 3, 0 }
304  },
305  //level_add
306  { 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 },
307  2, //golomb_order
308  6, //inc_limit
309  7 //max_run
310  },
311  {
312  { //level / run
313  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
314  { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 1, 2, 0 },
315  { -1, 2, 0 }, { 6, 1, 0 }, { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 },
316  { -8, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 1, 3, 0 },
317  { -1, 3, 0 }, { 10, 1, 1 }, { -10, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 1 },
318  { -11, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 1 }, { -12, 1, 1 }, { 1, 4, 0 },
319  { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 13, 1, 1 }, { -13, 1, 1 }, { 5, 2, 0 },
320  { -5, 2, 0 }, { 14, 1, 1 }, { -14, 1, 1 }, { 6, 2, 0 }, { -6, 2, 0 }, { 1, 5, 0 },
321  { -1, 5, 0 }, { 15, 1, 1 }, { -15, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 16, 1, 1 },
322  { -16, 1, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 2, 0 }, { -7, 2, 0 }
323  },
324  //level_add
325  { 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 },
326  2, //golomb_order
327  9, //inc_limit
328  5 //max_run
329  },
330  {
331  { //level / run
332  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
333  { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
334  { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 8, 1, 0 },
335  { -8, 1, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
336  { -11, 1, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 13, 1, 0 },
337  { -13, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 15, 1, 0 },
338  { -15, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 16, 1, 0 }, { -16, 1, 0 }, { 17, 1, 0 },
339  { -17, 1, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 19, 1, 0 },
340  { -19, 1, 0 }, { 20, 1, 0 }, { -20, 1, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 1, 4, 0 },
341  { -1, 4, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 21, 1, 0 }, { -21, 1, 0 }
342  },
343  //level_add
344  { 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 },
345  2, //golomb_order
346  INT_MAX, //inc_limit
347  4 //max_run
348  }
349 };
350 
351 static const struct dec_2dvlc chroma_dec[5] = {
352  {
353  { //level / run
354  { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
355  { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
356  { 1, 7, 1 }, { -1, 7, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 8, 1 }, { -1, 8, 1 },
357  { 1, 9, 1 }, { -1, 9, 1 }, { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 },
358  { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
359  { 1, 15, 1 }, { -1, 15, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 16, 1 }, { -1, 16, 1 },
360  { 1, 17, 1 }, { -1, 17, 1 }, { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 },
361  { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 1, 22, 1 }, { -1, 22, 1 },
362  { 2, 2, 2 }, { -2, 2, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
363  { 1, 25, 1 }, { -1, 25, 1 }, { 4, 1, 3 }, { -4, 1, 3 }, { EOB }
364  },
365  //level_add
366  { 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 },
367  2, //golomb_order
368  0, //inc_limit
369  25 //max_run
370  },
371  {
372  { //level / run
373  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 },
374  { -2, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
375  { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 1, 7, 0 },
376  { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 2, 1 }, { -2, 2, 1 }, { 1, 9, 0 },
377  { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 4, 1, 2 },
378  { -4, 1, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 },
379  { -1, 14, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 },
380  { -2, 4, 1 }, { 5, 1, 3 }, { -5, 1, 3 }, { 3, 2, 2 }, { -3, 2, 2 }, { 1, 16, 0 },
381  { -1, 16, 0 }, { 1, 17, 0 }, { -1, 17, 0 }, { 1, 18, 0 }, { -1, 18, 0 }, { 2, 5, 1 },
382  { -2, 5, 1 }, { 1, 19, 0 }, { -1, 19, 0 }, { 1, 20, 0 }, { -1, 20, 0 }
383  },
384  //level_add
385  { 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 },
386  0, //golomb_order
387  1, //inc_limit
388  20 //max_run
389  },
390  {
391  { //level / run
392  { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
393  { -1, 2, 0 }, { 3, 1, 1 }, { -3, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 4, 1, 1 },
394  { -4, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
395  { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
396  { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 1, 7, 0 },
397  { -1, 7, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 1, 2 }, { -7, 1, 2 }, { 1, 8, 0 },
398  { -1, 8, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 3, 1 },
399  { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 2 },
400  { -8, 1, 2 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 9, 1, 2 },
401  { -9, 1, 2 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 },
402  },
403  //level_add
404  { 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 },
405  1, //golomb_order
406  2, //inc_limit
407  11 //max_run
408  },
409  {
410  { //level / run
411  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
412  { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 5, 1, 1 },
413  { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 1, 3, 0 },
414  { -1, 3, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 8, 1, 1 },
415  { -8, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 9, 1, 1 },
416  { -9, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 10, 1, 1 },
417  {-10, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 2, 4, 0 },
418  { -2, 4, 0 }, { 11, 1, 1 }, {-11, 1, 1 }, { 1, 6, 0 }, { -1, 6, 0 }, { 12, 1, 1 },
419  {-12, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 6, 2, 1 }, { -6, 2, 1 }, { 13, 1, 1 },
420  {-13, 1, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 }, { -1, 8, 0 },
421  },
422  //level_add
423  { 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 },
424  1, //golomb_order
425  4, //inc_limit
426  8 //max_run
427  },
428  {
429  { //level / run
430  { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
431  { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
432  { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 1, 2, 0 },
433  { -1, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
434  { -11, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 13, 1, 0 },
435  { -13, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 1, 3, 0 },
436  { -1, 3, 0 }, { 15, 1, 0 }, { -15, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 16, 1, 0 },
437  { -16, 1, 0 }, { 17, 1, 0 }, { -17, 1, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 },
438  { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 6, 2, 0 },
439  { -6, 2, 0 }, { 19, 1, 0 }, { -19, 1, 0 }, { 1, 5, 0 }, { -1, 5, 0 },
440  },
441  //level_add
442  { 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 },
443  0, //golomb_order
444  INT_MAX, //inc_limit
445  5, //max_run
446  }
447 };
448 
449 #undef EOB
450 
451 /*****************************************************************************
452  *
453  * motion vector prediction
454  *
455  ****************************************************************************/
456 
457 static inline void store_mvs(AVSContext *h)
458 {
459  h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
460  h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
461  h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
462  h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
463 }
464 
465 static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
466  cavs_vector *col_mv)
467 {
468  cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
469  int den = h->direct_den[col_mv->ref];
470  int m = col_mv->x >> 31;
471 
472  pmv_fw->dist = h->dist[1];
473  pmv_bw->dist = h->dist[0];
474  pmv_fw->ref = 1;
475  pmv_bw->ref = 0;
476  /* scale the co-located motion vector according to its temporal span */
477  pmv_fw->x = (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
478  pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
479  m = col_mv->y >> 31;
480  pmv_fw->y = (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
481  pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
482 }
483 
484 static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
485  enum cavs_block size)
486 {
487  cavs_vector *dst = src + MV_BWD_OFFS;
488 
489  /* backward mv is the scaled and negated forward mv */
490  dst->x = -((src->x * h->sym_factor + 256) >> 9);
491  dst->y = -((src->y * h->sym_factor + 256) >> 9);
492  dst->ref = 0;
493  dst->dist = h->dist[0];
494  set_mvs(dst, size);
495 }
496 
497 /*****************************************************************************
498  *
499  * residual data decoding
500  *
501  ****************************************************************************/
502 
503 /** kth-order exponential golomb code */
504 static inline int get_ue_code(GetBitContext *gb, int order)
505 {
506  unsigned ret = get_ue_golomb(gb);
507  if (ret >= ((1U<<31)>>order)) {
508  av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too larger\n");
509  return AVERROR_INVALIDDATA;
510  }
511  if (order) {
512  return (ret<<order) + get_bits(gb, order);
513  }
514  return ret;
515 }
516 
517 static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
518  int16_t *dst, int mul, int shift, int coeff_num)
519 {
520  int round = 1 << (shift - 1);
521  int pos = -1;
522  const uint8_t *scantab = h->scantable.permutated;
523 
524  /* inverse scan and dequantization */
525  while (--coeff_num >= 0) {
526  pos += run_buf[coeff_num];
527  if (pos > 63) {
528  av_log(h->avctx, AV_LOG_ERROR,
529  "position out of block bounds at pic %d MB(%d,%d)\n",
530  h->cur.poc, h->mbx, h->mby);
531  return AVERROR_INVALIDDATA;
532  }
533  dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
534  }
535  return 0;
536 }
537 
538 /**
539  * decode coefficients from one 8x8 block, dequantize, inverse transform
540  * and add them to sample block
541  * @param r pointer to 2D VLC table
542  * @param esc_golomb_order escape codes are k-golomb with this order k
543  * @param qp quantizer
544  * @param dst location of sample block
545  * @param stride line stride in frame buffer
546  */
547 static int decode_residual_block(AVSContext *h, GetBitContext *gb,
548  const struct dec_2dvlc *r, int esc_golomb_order,
549  int qp, uint8_t *dst, int stride)
550 {
551  int i, esc_code, level, mask, ret;
552  unsigned int level_code, run;
553  int16_t level_buf[65];
554  uint8_t run_buf[65];
555  int16_t *block = h->block;
556 
557  for (i = 0; i < 65; i++) {
558  level_code = get_ue_code(gb, r->golomb_order);
559  if (level_code >= ESCAPE_CODE) {
560  run = ((level_code - ESCAPE_CODE) >> 1) + 1;
561  if(run > 64) {
562  av_log(h->avctx, AV_LOG_ERROR, "run %d is too large\n", run);
563  return AVERROR_INVALIDDATA;
564  }
565  esc_code = get_ue_code(gb, esc_golomb_order);
566  level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
567  while (level > r->inc_limit)
568  r++;
569  mask = -(level_code & 1);
570  level = (level ^ mask) - mask;
571  } else {
572  level = r->rltab[level_code][0];
573  if (!level) //end of block signal
574  break;
575  run = r->rltab[level_code][1];
576  r += r->rltab[level_code][2];
577  }
578  level_buf[i] = level;
579  run_buf[i] = run;
580  }
581  if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
582  dequant_shift[qp], i)) < 0)
583  return ret;
584  h->cdsp.cavs_idct8_add(dst, block, stride);
585  h->bdsp.clear_block(block);
586  return 0;
587 }
588 
589 
590 static inline void decode_residual_chroma(AVSContext *h)
591 {
592  if (h->cbp & (1 << 4))
593  decode_residual_block(h, &h->gb, chroma_dec, 0,
594  ff_cavs_chroma_qp[h->qp], h->cu, h->c_stride);
595  if (h->cbp & (1 << 5))
596  decode_residual_block(h, &h->gb, chroma_dec, 0,
597  ff_cavs_chroma_qp[h->qp], h->cv, h->c_stride);
598 }
599 
600 static inline int decode_residual_inter(AVSContext *h)
601 {
602  int block;
603 
604  /* get coded block pattern */
605  int cbp = get_ue_golomb(&h->gb);
606  if (cbp > 63U) {
607  av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp %d\n", cbp);
608  return AVERROR_INVALIDDATA;
609  }
610  h->cbp = cbp_tab[cbp][1];
611 
612  /* get quantizer */
613  if (h->cbp && !h->qp_fixed)
614  h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;
615  for (block = 0; block < 4; block++)
616  if (h->cbp & (1 << block))
617  decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
618  h->cy + h->luma_scan[block], h->l_stride);
619  decode_residual_chroma(h);
620 
621  return 0;
622 }
623 
624 /*****************************************************************************
625  *
626  * macroblock level
627  *
628  ****************************************************************************/
629 
630 static inline void set_mv_intra(AVSContext *h)
631 {
632  h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
633  set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
634  h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
635  set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
636  if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
637  h->col_type_base[h->mbidx] = I_8X8;
638 }
639 
640 static int decode_mb_i(AVSContext *h, int cbp_code)
641 {
642  GetBitContext *gb = &h->gb;
643  unsigned pred_mode_uv;
644  int block;
645  uint8_t top[18];
646  uint8_t *left = NULL;
647  uint8_t *d;
648 
649  ff_cavs_init_mb(h);
650 
651  /* get intra prediction modes from stream */
652  for (block = 0; block < 4; block++) {
653  int nA, nB, predpred;
654  int pos = scan3x3[block];
655 
656  nA = h->pred_mode_Y[pos - 1];
657  nB = h->pred_mode_Y[pos - 3];
658  predpred = FFMIN(nA, nB);
659  if (predpred == NOT_AVAIL) // if either is not available
660  predpred = INTRA_L_LP;
661  if (!get_bits1(gb)) {
662  int rem_mode = get_bits(gb, 2);
663  predpred = rem_mode + (rem_mode >= predpred);
664  }
665  h->pred_mode_Y[pos] = predpred;
666  }
667  pred_mode_uv = get_ue_golomb(gb);
668  if (pred_mode_uv > 6) {
669  av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
670  return AVERROR_INVALIDDATA;
671  }
672  ff_cavs_modify_mb_i(h, &pred_mode_uv);
673 
674  /* get coded block pattern */
675  if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
676  cbp_code = get_ue_golomb(gb);
677  if (cbp_code > 63U) {
678  av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
679  return AVERROR_INVALIDDATA;
680  }
681  h->cbp = cbp_tab[cbp_code][0];
682  if (h->cbp && !h->qp_fixed)
683  h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
684 
685  /* luma intra prediction interleaved with residual decode/transform/add */
686  for (block = 0; block < 4; block++) {
687  d = h->cy + h->luma_scan[block];
688  ff_cavs_load_intra_pred_luma(h, top, &left, block);
689  h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
690  (d, top, left, h->l_stride);
691  if (h->cbp & (1<<block))
692  decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
693  }
694 
695  /* chroma intra prediction */
696  ff_cavs_load_intra_pred_chroma(h);
697  h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
698  h->left_border_u, h->c_stride);
699  h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
700  h->left_border_v, h->c_stride);
701 
702  decode_residual_chroma(h);
703  ff_cavs_filter(h, I_8X8);
704  set_mv_intra(h);
705  return 0;
706 }
707 
708 static inline void set_intra_mode_default(AVSContext *h)
709 {
710  if (h->stream_revision > 0) {
711  h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
712  h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
713  } else {
714  h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
715  h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
716  }
717 }
718 
719 static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
720 {
721  GetBitContext *gb = &h->gb;
722  int ref[4];
723 
724  ff_cavs_init_mb(h);
725  switch (mb_type) {
726  case P_SKIP:
727  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
728  break;
729  case P_16X16:
730  ref[0] = h->ref_flag ? 0 : get_bits1(gb);
731  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
732  break;
733  case P_16X8:
734  ref[0] = h->ref_flag ? 0 : get_bits1(gb);
735  ref[2] = h->ref_flag ? 0 : get_bits1(gb);
736  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
737  ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
738  break;
739  case P_8X16:
740  ref[0] = h->ref_flag ? 0 : get_bits1(gb);
741  ref[1] = h->ref_flag ? 0 : get_bits1(gb);
742  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
743  ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
744  break;
745  case P_8X8:
746  ref[0] = h->ref_flag ? 0 : get_bits1(gb);
747  ref[1] = h->ref_flag ? 0 : get_bits1(gb);
748  ref[2] = h->ref_flag ? 0 : get_bits1(gb);
749  ref[3] = h->ref_flag ? 0 : get_bits1(gb);
750  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
751  ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
752  ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
753  ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
754  }
755  ff_cavs_inter(h, mb_type);
756  set_intra_mode_default(h);
757  store_mvs(h);
758  if (mb_type != P_SKIP)
759  decode_residual_inter(h);
760  ff_cavs_filter(h, mb_type);
761  h->col_type_base[h->mbidx] = mb_type;
762 }
763 
764 static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
765 {
766  int block;
767  enum cavs_sub_mb sub_type[4];
768  int flags;
769 
770  ff_cavs_init_mb(h);
771 
772  /* reset all MVs */
773  h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
774  set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
775  h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
776  set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
777  switch (mb_type) {
778  case B_SKIP:
779  case B_DIRECT:
780  if (!h->col_type_base[h->mbidx]) {
781  /* intra MB at co-location, do in-plane prediction */
782  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
783  ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
784  } else
785  /* direct prediction from co-located P MB, block-wise */
786  for (block = 0; block < 4; block++)
787  mv_pred_direct(h, &h->mv[mv_scan[block]],
788  &h->col_mv[h->mbidx * 4 + block]);
789  break;
790  case B_FWD_16X16:
791  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
792  break;
793  case B_SYM_16X16:
794  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
795  mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
796  break;
797  case B_BWD_16X16:
798  ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
799  break;
800  case B_8X8:
801 #define TMP_UNUSED_INX 7
802  flags = 0;
803  for (block = 0; block < 4; block++)
804  sub_type[block] = get_bits(&h->gb, 2);
805  for (block = 0; block < 4; block++) {
806  switch (sub_type[block]) {
807  case B_SUB_DIRECT:
808  if (!h->col_type_base[h->mbidx]) {
809  /* intra MB at co-location, do in-plane prediction */
810  if(flags==0) {
811  // if col-MB is a Intra MB, current Block size is 16x16.
812  // AVS standard section 9.9.1
813  if(block>0){
814  h->mv[TMP_UNUSED_INX ] = h->mv[MV_FWD_X0 ];
815  h->mv[TMP_UNUSED_INX + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
816  }
817  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2,
818  MV_PRED_BSKIP, BLK_8X8, 1);
819  ff_cavs_mv(h, MV_FWD_X0+MV_BWD_OFFS,
820  MV_FWD_C2+MV_BWD_OFFS,
821  MV_PRED_BSKIP, BLK_8X8, 0);
822  if(block>0) {
823  flags = mv_scan[block];
824  h->mv[flags ] = h->mv[MV_FWD_X0 ];
825  h->mv[flags + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
826  h->mv[MV_FWD_X0 ] = h->mv[TMP_UNUSED_INX ];
827  h->mv[MV_FWD_X0 + MV_BWD_OFFS] = h->mv[TMP_UNUSED_INX + MV_BWD_OFFS];
828  } else
829  flags = MV_FWD_X0;
830  } else {
831  h->mv[mv_scan[block] ] = h->mv[flags ];
832  h->mv[mv_scan[block] + MV_BWD_OFFS] = h->mv[flags + MV_BWD_OFFS];
833  }
834  } else
835  mv_pred_direct(h, &h->mv[mv_scan[block]],
836  &h->col_mv[h->mbidx * 4 + block]);
837  break;
838  case B_SUB_FWD:
839  ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
840  MV_PRED_MEDIAN, BLK_8X8, 1);
841  break;
842  case B_SUB_SYM:
843  ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
844  MV_PRED_MEDIAN, BLK_8X8, 1);
845  mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
846  break;
847  }
848  }
849 #undef TMP_UNUSED_INX
850  for (block = 0; block < 4; block++) {
851  if (sub_type[block] == B_SUB_BWD)
852  ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
853  mv_scan[block] + MV_BWD_OFFS - 3,
854  MV_PRED_MEDIAN, BLK_8X8, 0);
855  }
856  break;
857  default:
858  if (mb_type <= B_SYM_16X16) {
859  av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);
860  return AVERROR_INVALIDDATA;
861  }
862  av_assert2(mb_type < B_8X8);
863  flags = ff_cavs_partition_flags[mb_type];
864  if (mb_type & 1) { /* 16x8 macroblock types */
865  if (flags & FWD0)
866  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
867  if (flags & SYM0)
868  mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
869  if (flags & FWD1)
870  ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
871  if (flags & SYM1)
872  mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
873  if (flags & BWD0)
874  ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
875  if (flags & BWD1)
876  ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
877  } else { /* 8x16 macroblock types */
878  if (flags & FWD0)
879  ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
880  if (flags & SYM0)
881  mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
882  if (flags & FWD1)
883  ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
884  if (flags & SYM1)
885  mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
886  if (flags & BWD0)
887  ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
888  if (flags & BWD1)
889  ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
890  }
891  }
892  ff_cavs_inter(h, mb_type);
893  set_intra_mode_default(h);
894  if (mb_type != B_SKIP)
895  decode_residual_inter(h);
896  ff_cavs_filter(h, mb_type);
897 
898  return 0;
899 }
900 
901 /*****************************************************************************
902  *
903  * slice level
904  *
905  ****************************************************************************/
906 
907 static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
908 {
909  if (h->stc > 0xAF)
910  av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
911 
912  if (h->stc >= h->mb_height) {
913  av_log(h->avctx, AV_LOG_ERROR, "stc 0x%02x is too large\n", h->stc);
914  return AVERROR_INVALIDDATA;
915  }
916 
917  h->mby = h->stc;
918  h->mbidx = h->mby * h->mb_width;
919 
920  /* mark top macroblocks as unavailable */
921  h->flags &= ~(B_AVAIL | C_AVAIL);
922  if (!h->pic_qp_fixed) {
923  h->qp_fixed = get_bits1(gb);
924  h->qp = get_bits(gb, 6);
925  }
926  /* inter frame or second slice can have weighting params */
927  if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
928  (!h->pic_structure && h->mby >= h->mb_width / 2))
929  if (get_bits1(gb)) { //slice_weighting_flag
930  av_log(h->avctx, AV_LOG_ERROR,
931  "weighted prediction not yet supported\n");
932  }
933  return 0;
934 }
935 
936 static inline int check_for_slice(AVSContext *h)
937 {
938  GetBitContext *gb = &h->gb;
939  int align;
940 
941  if (h->mbx)
942  return 0;
943  align = (-get_bits_count(gb)) & 7;
944  /* check for stuffing byte */
945  if (!align && (show_bits(gb, 8) == 0x80))
946  align = 8;
947  if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
948  skip_bits_long(gb, 24 + align);
949  h->stc = get_bits(gb, 8);
950  if (h->stc >= h->mb_height)
951  return 0;
952  decode_slice_header(h, gb);
953  return 1;
954  }
955  return 0;
956 }
957 
958 /*****************************************************************************
959  *
960  * frame level
961  *
962  ****************************************************************************/
963 
964 static int decode_pic(AVSContext *h)
965 {
966  int ret;
967  int skip_count = -1;
968  enum cavs_mb mb_type;
969 
970  if (!h->top_qp) {
971  av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");
972  return AVERROR_INVALIDDATA;
973  }
974 
975  av_frame_unref(h->cur.f);
976 
977  skip_bits(&h->gb, 16);//bbv_dwlay
978  if (h->stc == PIC_PB_START_CODE) {
979  h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
980  if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
981  av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
982  return AVERROR_INVALIDDATA;
983  }
984  /* make sure we have the reference frames we need */
985  if (!h->DPB[0].f->data[0] ||
986  (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
987  return AVERROR_INVALIDDATA;
988  } else {
989  h->cur.f->pict_type = AV_PICTURE_TYPE_I;
990  if (get_bits1(&h->gb))
991  skip_bits(&h->gb, 24);//time_code
992  /* old sample clips were all progressive and no low_delay,
993  bump stream revision if detected otherwise */
994  if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
995  h->stream_revision = 1;
996  /* similarly test top_field_first and repeat_first_field */
997  else if (show_bits(&h->gb, 11) & 3)
998  h->stream_revision = 1;
999  if (h->stream_revision > 0)
1000  skip_bits(&h->gb, 1); //marker_bit
1001  }
1002 
1003  ret = ff_get_buffer(h->avctx, h->cur.f, h->cur.f->pict_type == AV_PICTURE_TYPE_B ?
1004  0 : AV_GET_BUFFER_FLAG_REF);
1005  if (ret < 0)
1006  return ret;
1007 
1008  if (!h->edge_emu_buffer) {
1009  int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
1010  h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
1011  if (!h->edge_emu_buffer)
1012  return AVERROR(ENOMEM);
1013  }
1014 
1015  if ((ret = ff_cavs_init_pic(h)) < 0)
1016  return ret;
1017  h->cur.poc = get_bits(&h->gb, 8) * 2;
1018 
1019  /* get temporal distances and MV scaling factors */
1020  if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1021  h->dist[0] = (h->cur.poc - h->DPB[0].poc) & 511;
1022  } else {
1023  h->dist[0] = (h->DPB[0].poc - h->cur.poc) & 511;
1024  }
1025  h->dist[1] = (h->cur.poc - h->DPB[1].poc) & 511;
1026  h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
1027  h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
1028  if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
1029  h->sym_factor = h->dist[0] * h->scale_den[1];
1030  } else {
1031  h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
1032  h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
1033  }
1034 
1035  if (h->low_delay)
1036  get_ue_golomb(&h->gb); //bbv_check_times
1037  h->progressive = get_bits1(&h->gb);
1038  h->pic_structure = 1;
1039  if (!h->progressive)
1040  h->pic_structure = get_bits1(&h->gb);
1041  if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
1042  skip_bits1(&h->gb); //advanced_pred_mode_disable
1043  skip_bits1(&h->gb); //top_field_first
1044  skip_bits1(&h->gb); //repeat_first_field
1045  h->pic_qp_fixed =
1046  h->qp_fixed = get_bits1(&h->gb);
1047  h->qp = get_bits(&h->gb, 6);
1048  if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1049  if (!h->progressive && !h->pic_structure)
1050  skip_bits1(&h->gb);//what is this?
1051  skip_bits(&h->gb, 4); //reserved bits
1052  } else {
1053  if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
1054  h->ref_flag = get_bits1(&h->gb);
1055  skip_bits(&h->gb, 4); //reserved bits
1056  h->skip_mode_flag = get_bits1(&h->gb);
1057  }
1058  h->loop_filter_disable = get_bits1(&h->gb);
1059  if (!h->loop_filter_disable && get_bits1(&h->gb)) {
1060  h->alpha_offset = get_se_golomb(&h->gb);
1061  h->beta_offset = get_se_golomb(&h->gb);
1062  } else {
1063  h->alpha_offset = h->beta_offset = 0;
1064  }
1065  if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1066  do {
1067  check_for_slice(h);
1068  decode_mb_i(h, 0);
1069  } while (ff_cavs_next_mb(h));
1070  } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
1071  do {
1072  if (check_for_slice(h))
1073  skip_count = -1;
1074  if (h->skip_mode_flag && (skip_count < 0))
1075  skip_count = get_ue_golomb(&h->gb);
1076  if (h->skip_mode_flag && skip_count--) {
1077  decode_mb_p(h, P_SKIP);
1078  } else {
1079  mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
1080  if (mb_type > P_8X8)
1081  decode_mb_i(h, mb_type - P_8X8 - 1);
1082  else
1083  decode_mb_p(h, mb_type);
1084  }
1085  } while (ff_cavs_next_mb(h));
1086  } else { /* AV_PICTURE_TYPE_B */
1087  do {
1088  if (check_for_slice(h))
1089  skip_count = -1;
1090  if (h->skip_mode_flag && (skip_count < 0))
1091  skip_count = get_ue_golomb(&h->gb);
1092  if (h->skip_mode_flag && skip_count--) {
1093  decode_mb_b(h, B_SKIP);
1094  } else {
1095  mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
1096  if (mb_type > B_8X8)
1097  decode_mb_i(h, mb_type - B_8X8 - 1);
1098  else
1099  decode_mb_b(h, mb_type);
1100  }
1101  } while (ff_cavs_next_mb(h));
1102  }
1103  if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1104  av_frame_unref(h->DPB[1].f);
1105  FFSWAP(AVSFrame, h->cur, h->DPB[1]);
1106  FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
1107  }
1108  return 0;
1109 }
1110 
1111 /*****************************************************************************
1112  *
1113  * headers and interface
1114  *
1115  ****************************************************************************/
1116 
1117 static int decode_seq_header(AVSContext *h)
1118 {
1119  int frame_rate_code;
1120  int width, height;
1121 
1122  h->profile = get_bits(&h->gb, 8);
1123  h->level = get_bits(&h->gb, 8);
1124  skip_bits1(&h->gb); //progressive sequence
1125 
1126  width = get_bits(&h->gb, 14);
1127  height = get_bits(&h->gb, 14);
1128  if ((h->width || h->height) && (h->width != width || h->height != height)) {
1129  avpriv_report_missing_feature(h->avctx,
1130  "Width/height changing in CAVS");
1131  return AVERROR_PATCHWELCOME;
1132  }
1133  if (width <= 0 || height <= 0) {
1134  av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");
1135  return AVERROR_INVALIDDATA;
1136  }
1137  h->width = width;
1138  h->height = height;
1139 
1140  skip_bits(&h->gb, 2); //chroma format
1141  skip_bits(&h->gb, 3); //sample_precision
1142  h->aspect_ratio = get_bits(&h->gb, 4);
1143  frame_rate_code = get_bits(&h->gb, 4);
1144  skip_bits(&h->gb, 18); //bit_rate_lower
1145  skip_bits1(&h->gb); //marker_bit
1146  skip_bits(&h->gb, 12); //bit_rate_upper
1147  h->low_delay = get_bits1(&h->gb);
1148  h->mb_width = (h->width + 15) >> 4;
1149  h->mb_height = (h->height + 15) >> 4;
1150  h->avctx->time_base.den = ff_mpeg12_frame_rate_tab[frame_rate_code].num;
1151  h->avctx->time_base.num = ff_mpeg12_frame_rate_tab[frame_rate_code].den;
1152  h->avctx->width = h->width;
1153  h->avctx->height = h->height;
1154  if (!h->top_qp)
1155  ff_cavs_init_top_lines(h);
1156  return 0;
1157 }
1158 
1159 static void cavs_flush(AVCodecContext * avctx)
1160 {
1161  AVSContext *h = avctx->priv_data;
1162  h->got_keyframe = 0;
1163 }
1164 
1165 static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1166  AVPacket *avpkt)
1167 {
1168  AVSContext *h = avctx->priv_data;
1169  const uint8_t *buf = avpkt->data;
1170  int buf_size = avpkt->size;
1171  uint32_t stc = -1;
1172  int input_size, ret;
1173  const uint8_t *buf_end;
1174  const uint8_t *buf_ptr;
1175 
1176  if (buf_size == 0) {
1177  if (!h->low_delay && h->DPB[0].f->data[0]) {
1178  *got_frame = 1;
1179  av_frame_move_ref(data, h->DPB[0].f);
1180  }
1181  return 0;
1182  }
1183 
1184  h->stc = 0;
1185 
1186  buf_ptr = buf;
1187  buf_end = buf + buf_size;
1188  for(;;) {
1189  buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);
1190  if ((stc & 0xFFFFFE00) || buf_ptr == buf_end) {
1191  if (!h->stc)
1192  av_log(h->avctx, AV_LOG_WARNING, "no frame decoded\n");
1193  return FFMAX(0, buf_ptr - buf);
1194  }
1195  input_size = (buf_end - buf_ptr) * 8;
1196  switch (stc) {
1197  case CAVS_START_CODE:
1198  init_get_bits(&h->gb, buf_ptr, input_size);
1199  decode_seq_header(h);
1200  break;
1201  case PIC_I_START_CODE:
1202  if (!h->got_keyframe) {
1203  av_frame_unref(h->DPB[0].f);
1204  av_frame_unref(h->DPB[1].f);
1205  h->got_keyframe = 1;
1206  }
1207  case PIC_PB_START_CODE:
1208  *got_frame = 0;
1209  if (!h->got_keyframe)
1210  break;
1211  init_get_bits(&h->gb, buf_ptr, input_size);
1212  h->stc = stc;
1213  if (decode_pic(h))
1214  break;
1215  *got_frame = 1;
1216  if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1217  if (h->DPB[!h->low_delay].f->data[0]) {
1218  if ((ret = av_frame_ref(data, h->DPB[!h->low_delay].f)) < 0)
1219  return ret;
1220  } else {
1221  *got_frame = 0;
1222  }
1223  } else {
1224  av_frame_move_ref(data, h->cur.f);
1225  }
1226  break;
1227  case EXT_START_CODE:
1228  //mpeg_decode_extension(avctx, buf_ptr, input_size);
1229  break;
1230  case USER_START_CODE:
1231  //mpeg_decode_user_data(avctx, buf_ptr, input_size);
1232  break;
1233  default:
1234  if (stc <= SLICE_MAX_START_CODE) {
1235  init_get_bits(&h->gb, buf_ptr, input_size);
1236  decode_slice_header(h, &h->gb);
1237  }
1238  break;
1239  }
1240  }
1241 }
1242 
1243 AVCodec ff_cavs_decoder = {
1244  .name = "cavs",
1245  .long_name = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
1246  .type = AVMEDIA_TYPE_VIDEO,
1247  .id = AV_CODEC_ID_CAVS,
1248  .priv_data_size = sizeof(AVSContext),
1249  .init = ff_cavs_init,
1250  .close = ff_cavs_end,
1251  .decode = cavs_decode_frame,
1252  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
1253  .flush = cavs_flush,
1254 };
Generated on Sun Jul 20 2014 23:05:45 for FFmpeg by   doxygen 1.8.2