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