• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
36 static const uint8_t mv_scan[4] = {
37     MV_FWD_X0, MV_FWD_X1,
38     MV_FWD_X2, MV_FWD_X3
39 };
40 
41 static const uint8_t cbp_tab[64][2] = {
42   { 63,  0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, {  0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },
43   {  7, 14 }, {  5, 11 }, { 10, 12 }, {  8,  5 }, { 12, 10 }, { 61,  7 }, {  4, 48 }, { 55,  3 },
44   {  1,  2 }, {  2,  8 }, { 59,  4 }, {  3,  1 }, { 62, 61 }, {  9, 55 }, {  6, 59 }, { 29, 62 },
45   { 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53,  9 }, { 30,  6 },
46   { 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },
47   { 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },
48   { 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },
49   { 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }
50 };
51 
52 static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
53 
54 static const uint8_t dequant_shift[64] = {
55   14, 14, 14, 14, 14, 14, 14, 14,
56   13, 13, 13, 13, 13, 13, 13, 13,
57   13, 12, 12, 12, 12, 12, 12, 12,
58   11, 11, 11, 11, 11, 11, 11, 11,
59   11, 10, 10, 10, 10, 10, 10, 10,
60   10,  9,  9,  9,  9,  9,  9,  9,
61   9,   8,  8,  8,  8,  8,  8,  8,
62   7,   7,  7,  7,  7,  7,  7,  7
63 };
64 
65 static const uint16_t dequant_mul[64] = {
66   32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
67   32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
68   65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
69   32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
70   65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
71   65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
72   65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
73   32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
74 };
75 
76 #define EOB 0, 0, 0
77 
78 static const struct dec_2dvlc intra_dec[7] = {
79     {
80         { //level / run / table_inc
81             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3, 1 },
82             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6, 1 },
83             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9, 1 },
84             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  2,  1,  2 }, { -2,  1, 2 },
85             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14, 1 },
86             {  1, 15,  1 }, { -1, 15,  1 }, {  2,  2,  2 }, { -2,  2,  2 }, {  1, 16,  1 }, { -1, 16, 1 },
87             {  1, 17,  1 }, { -1, 17,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 18,  1 }, { -1, 18, 1 },
88             {  1, 19,  1 }, { -1, 19,  1 }, {  2,  3,  2 }, { -2,  3,  2 }, {  1, 20,  1 }, { -1, 20, 1 },
89             {  1, 21,  1 }, { -1, 21,  1 }, {  2,  4,  2 }, { -2,  4,  2 }, {  1, 22,  1 }, { -1, 22, 1 },
90             {  2,  5,  2 }, { -2,  5,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {   EOB    }
91         },
92         //level_add
93         { 0, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1 },
94         2, //golomb_order
95         0, //inc_limit
96         23, //max_run
97     },
98     {
99         { //level / run
100             {  1,  1,  0 }, { -1,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  1 }, { -2,  1,  1 },
101             {  1,  3,  0 }, { -1,  3,  0 }, {     EOB    }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },
102             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  2,  2,  1 },
103             { -2,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  1,  9,  0 },
104             { -1,  9,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  4,  1,  2 }, { -4,  1,  2 }, {  1, 10,  0 },
105             { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  3,  2,  2 },
106             { -3,  2,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  5,  1,  3 },
107             { -5,  1,  3 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 14,  0 },
108             { -1, 14,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  2,  8,  1 }, { -2,  8,  1 }, {  3,  3,  2 },
109             { -3,  3,  2 }, {  6,  1,  3 }, { -6,  1,  3 }, {  1, 15,  0 }, { -1, 15,  0 }
110         },
111         //level_add
112         { 0, 7, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
113         2, //golomb_order
114         1, //inc_limit
115         15, //max_run
116     },
117     {
118         { //level / run
119             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 },
120             {  3,  1,  1 }, { -3,  1,  1 }, {     EOB    }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },
121             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },
122             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },
123             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  2,  4,  0 },
124             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },
125             { -7,  1,  2 }, {  3,  3,  1 }, { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 },
126             { -1,  8,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  3 }, { -8,  1,  3 }, {  1,  9,  0 },
127             { -1,  9,  0 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 }, {  2,  7,  0 },
128             { -2,  7,  0 }, {  9,  1,  3 }, { -9,  1,  3 }, {  1, 10,  0 }, { -1, 10,  0 }
129         },
130         //level_add
131         { 0, 10, 6, 4, 4, 3, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
132         2, //golomb_order
133         2, //inc_limit
134         10, //max_run
135     },
136     {
137         { //level / run
138             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },
139             {  1,  2,  0 }, { -1,  2,  0 }, {     EOB    }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  1 },
140             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  1 },
141             { -6,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },
142             { -1,  4,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },
143             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  5,  2,  1 },
144             { -5,  2,  1 }, {  2,  4,  0 }, { -2,  4,  0 }, { 10,  1,  2 }, {-10,  1,  2 }, {  3,  3,  0 },
145             { -3,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 11,  1,  3 }, {-11,  1,  3 }, {  6,  2,  1 },
146             { -6,  2,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  5,  0 }, { -2,  5,  0 }, {  3,  4,  0 },
147             { -3,  4,  0 }, { 12,  1,  3 }, {-12,  1,  3 }, {  4,  3,  0 }, { -4,  3,  0 }
148          },
149         //level_add
150         { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
151         2, //golomb_order
152         4, //inc_limit
153         7, //max_run
154     },
155     {
156         { //level / run
157             {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 }, { -3,  1,  0 },
158             {     EOB    }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },
159             { -6,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  1 },
160             { -8,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, { 10,  1,  1 },
161             {-10,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 11,  1,  2 },
162             {-11,  1,  2 }, {  4,  2,  0 }, { -4,  2,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, { 13,  1,  2 },
163             {-13,  1,  2 }, {  5,  2,  0 }, { -5,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 },
164             { -2,  3,  0 }, { 14,  1,  2 }, {-14,  1,  2 }, {  6,  2,  0 }, { -6,  2,  0 }, { 15,  1,  2 },
165             {-15,  1,  2 }, { 16,  1,  2 }, {-16,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  5,  0 },
166             { -1,  5,  0 }, {  7,  2,  0 }, { -7,  2,  0 }, { 17,  1,  2 }, {-17,  1,  2 }
167         },
168         //level_add
169         { 0,18, 8, 4, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
170         2, //golomb_order
171         7, //inc_limit
172         5, //max_run
173     },
174     {
175         { //level / run
176             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },
177             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },
178             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },
179             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 11,  1,  1 },
180             {-11,  1,  1 }, { 12,  1,  1 }, {-12,  1,  1 }, { 13,  1,  1 }, {-13,  1,  1 }, {  2,  2,  0 },
181             { -2,  2,  0 }, { 14,  1,  1 }, {-14,  1,  1 }, { 15,  1,  1 }, {-15,  1,  1 }, {  3,  2,  0 },
182             { -3,  2,  0 }, { 16,  1,  1 }, {-16,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, { 17,  1,  1 },
183             {-17,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, { 18,  1,  1 }, {-18,  1,  1 }, {  5,  2,  0 },
184             { -5,  2,  0 }, { 19,  1,  1 }, {-19,  1,  1 }, { 20,  1,  1 }, {-20,  1,  1 }, {  6,  2,  0 },
185             { -6,  2,  0 }, { 21,  1,  1 }, {-21,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }
186         },
187         //level_add
188         { 0, 22, 7, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
189         2, //golomb_order
190         10, //inc_limit
191         3, //max_run
192     },
193     {
194         { //level / run
195             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },
196             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 }, { -5,  1,  0 }, {  6,  1,  0 },
197             { -6,  1,  0 }, {  7,  1,  0 }, { -7,  1,  0 }, {  8,  1,  0 }, { -8,  1,  0 }, {  9,  1,  0 },
198             { -9,  1,  0 }, { 10,  1,  0 }, {-10,  1,  0 }, { 11,  1,  0 }, {-11,  1,  0 }, { 12,  1,  0 },
199             {-12,  1,  0 }, { 13,  1,  0 }, {-13,  1,  0 }, { 14,  1,  0 }, {-14,  1,  0 }, { 15,  1,  0 },
200             {-15,  1,  0 }, { 16,  1,  0 }, {-16,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, { 17,  1,  0 },
201             {-17,  1,  0 }, { 18,  1,  0 }, {-18,  1,  0 }, { 19,  1,  0 }, {-19,  1,  0 }, { 20,  1,  0 },
202             {-20,  1,  0 }, { 21,  1,  0 }, {-21,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, { 22,  1,  0 },
203             {-22,  1,  0 }, { 23,  1,  0 }, {-23,  1,  0 }, { 24,  1,  0 }, {-24,  1,  0 }, { 25,  1,  0 },
204             {-25,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, { 26,  1,  0 }, {-26,  1,  0 }
205         },
206         //level_add
207         { 0, 27, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
208         2, //golomb_order
209         INT_MAX, //inc_limit
210         2, //max_run
211     }
212 };
213 
214 static const struct dec_2dvlc inter_dec[7] = {
215     {
216         { //level / run
217             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },
218             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },
219             {  1,  7,  1 }, { -1,  7,  1 }, {  1,  8,  1 }, { -1,  8,  1 }, {  1,  9,  1 }, { -1,  9,  1 },
220             {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 }, {  1, 12,  1 }, { -1, 12,  1 },
221             {  1, 13,  1 }, { -1, 13,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1, 14,  1 }, { -1, 14,  1 },
222             {  1, 15,  1 }, { -1, 15,  1 }, {  1, 16,  1 }, { -1, 16,  1 }, {  1, 17,  1 }, { -1, 17,  1 },
223             {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 }, {  3,  1,  3 }, { -3,  1,  3 },
224             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  2,  2,  2 }, { -2,  2,  2 },
225             {  1, 22,  1 }, { -1, 22,  1 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },
226             {  1, 25,  1 }, { -1, 25,  1 }, {  1, 26,  1 }, { -1, 26,  1 }, {   EOB    }
227         },
228         //level_add
229         { 0, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 },
230         3, //golomb_order
231         0, //inc_limit
232         26 //max_run
233     },
234     {
235         { //level / run
236             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  1,  3,  0 },
237             { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },
238             { -1,  6,  0 }, {  2,  1,  1 }, { -2,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  1,  8,  0 },
239             { -1,  8,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  2,  2,  1 },
240             { -2,  2,  1 }, {  1, 11,  0 }, { -1, 11,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  1,  2 },
241             { -3,  1,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 }, { -1, 14,  0 }, {  2,  3,  1 },
242             { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 }, { -2,  4,  1 }, {  1, 16,  0 },
243             { -1, 16,  0 }, {  2,  5,  1 }, { -2,  5,  1 }, {  1, 17,  0 }, { -1, 17,  0 }, {  4,  1,  3 },
244             { -4,  1,  3 }, {  2,  6,  1 }, { -2,  6,  1 }, {  1, 18,  0 }, { -1, 18,  0 }, {  1, 19,  0 },
245             { -1, 19,  0 }, {  2,  7,  1 }, { -2,  7,  1 }, {  3,  2,  2 }, { -3,  2,  2 }
246         },
247         //level_add
248         { 0, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1 },
249         2, //golomb_order
250         1, //inc_limit
251         19 //max_run
252     },
253     {
254         { //level / run
255             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  0 },
256             { -2,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  3,  1,  1 },
257             { -3,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  1,  6,  0 },
258             { -1,  6,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  1,  2 },
259             { -4,  1,  2 }, {  1,  8,  0 }, { -1,  8,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  4,  0 },
260             { -2,  4,  0 }, {  1,  9,  0 }, { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  5,  1,  2 },
261             { -5,  1,  2 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  2,  6,  0 },
262             { -2,  6,  0 }, {  1, 12,  0 }, { -1, 12,  0 }, {  3,  3,  1 }, { -3,  3,  1 }, {  6,  1,  2 },
263             { -6,  1,  2 }, {  4,  2,  2 }, { -4,  2,  2 }, {  1, 13,  0 }, { -1, 13,  0 }, {  2,  7,  0 },
264             { -2,  7,  0 }, {  3,  4,  1 }, { -3,  4,  1 }, {  1, 14,  0 }, { -1, 14,  0 }
265         },
266         //level_add
267         { 0, 7, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
268         2, //golomb_order
269         2, //inc_limit
270         14 //max_run
271     },
272     {
273         { //level / run
274             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },
275             { -1,  2,  0 }, {  3,  1,  0 }, { -3,  1,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  2,  2,  0 },
276             { -2,  2,  0 }, {  4,  1,  1 }, { -4,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  1 },
277             { -5,  1,  1 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  2,  3,  0 },
278             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  2,  4,  0 },
279             { -2,  4,  0 }, {  1,  7,  0 }, { -1,  7,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  7,  1,  2 },
280             { -7,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  5,  0 },
281             { -2,  5,  0 }, {  8,  1,  2 }, { -8,  1,  2 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  4,  0 },
282             { -3,  4,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  1, 10,  0 },
283             { -1, 10,  0 }, {  9,  1,  2 }, { -9,  1,  2 }, {  4,  3,  1 }, { -4,  3,  1 }
284         },
285         //level_add
286         { 0,10, 6, 5, 4, 3, 3, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
287         2, //golomb_order
288         3, //inc_limit
289         10 //max_run
290     },
291     {
292         { //level / run
293             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },
294             { -3,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  5,  1,  0 },
295             { -5,  1,  0 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  3,  0 }, { -1,  3,  0 }, {  6,  1,  0 },
296             { -6,  1,  0 }, {  3,  2,  0 }, { -3,  2,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  1,  4,  0 },
297             { -1,  4,  0 }, {  8,  1,  1 }, { -8,  1,  1 }, {  2,  3,  0 }, { -2,  3,  0 }, {  4,  2,  0 },
298             { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, {  9,  1,  1 }, { -9,  1,  1 }, {  5,  2,  0 },
299             { -5,  2,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, { 10,  1,  2 },
300             {-10,  1,  2 }, {  3,  3,  0 }, { -3,  3,  0 }, { 11,  1,  2 }, {-11,  1,  2 }, {  1,  7,  0 },
301             { -1,  7,  0 }, {  6,  2,  0 }, { -6,  2,  0 }, {  3,  4,  0 }, { -3,  4,  0 }, {  2,  5,  0 },
302             { -2,  5,  0 }, { 12,  1,  2 }, {-12,  1,  2 }, {  4,  3,  0 }, { -4,  3,  0 }
303         },
304         //level_add
305         { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
306         2, //golomb_order
307         6, //inc_limit
308         7  //max_run
309     },
310     {
311         { //level / run
312             {      EOB    }, {  1,  1,  0 }, {  -1,  1,  0 }, {  2,  1,  0 }, {  -2,  1,  0 }, {  3,  1,  0 },
313             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  1,  2,  0 },
314             {  -1,  2,  0 }, {  6,  1,  0 }, {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 },
315             {  -8,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, {  1,  3,  0 },
316             {  -1,  3,  0 }, { 10,  1,  1 }, { -10,  1,  1 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 11,  1,  1 },
317             { -11,  1,  1 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 12,  1,  1 }, { -12,  1,  1 }, {  1,  4,  0 },
318             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 13,  1,  1 }, { -13,  1,  1 }, {  5,  2,  0 },
319             {  -5,  2,  0 }, { 14,  1,  1 }, { -14,  1,  1 }, {  6,  2,  0 }, {  -6,  2,  0 }, {  1,  5,  0 },
320             {  -1,  5,  0 }, { 15,  1,  1 }, { -15,  1,  1 }, {  3,  3,  0 }, {  -3,  3,  0 }, { 16,  1,  1 },
321             { -16,  1,  1 }, {  2,  4,  0 }, {  -2,  4,  0 }, {  7,  2,  0 }, {  -7,  2,  0 }
322         },
323         //level_add
324         { 0, 17, 8, 4, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
325         2, //golomb_order
326         9, //inc_limit
327         5  //max_run
328     },
329     {
330         { //level / run
331             {      EOB    }, {  1,  1,  0 }, {  -1,  1,  0 }, {  2,  1,  0 }, {  -2,  1,  0 }, {   3,  1,  0 },
332             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {   6,  1,  0 },
333             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  1,  2,  0 }, {  -1,  2,  0 }, {   8,  1,  0 },
334             {  -8,  1,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, {  11,  1,  0 },
335             { -11,  1,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, {  13,  1,  0 },
336             { -13,  1,  0 }, {  1,  3,  0 }, {  -1,  3,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  15,  1,  0 },
337             { -15,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 16,  1,  0 }, { -16,  1,  0 }, {  17,  1,  0 },
338             { -17,  1,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, {  19,  1,  0 },
339             { -19,  1,  0 }, { 20,  1,  0 }, { -20,  1,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, {   1,  4,  0 },
340             {  -1,  4,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, { 21,  1,  0 }, { -21,  1,  0 }
341         },
342         //level_add
343         { 0, 22, 6, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
344         2, //golomb_order
345         INT_MAX, //inc_limit
346         4 //max_run
347     }
348 };
349 
350 static const struct dec_2dvlc chroma_dec[5] = {
351     {
352         { //level / run
353             {  1,  1,  1 }, { -1,  1,  1 }, {  1,  2,  1 }, { -1,  2,  1 }, {  1,  3,  1 }, { -1,  3,  1 },
354             {  1,  4,  1 }, { -1,  4,  1 }, {  1,  5,  1 }, { -1,  5,  1 }, {  1,  6,  1 }, { -1,  6,  1 },
355             {  1,  7,  1 }, { -1,  7,  1 }, {  2,  1,  2 }, { -2,  1,  2 }, {  1,  8,  1 }, { -1,  8,  1 },
356             {  1,  9,  1 }, { -1,  9,  1 }, {  1, 10,  1 }, { -1, 10,  1 }, {  1, 11,  1 }, { -1, 11,  1 },
357             {  1, 12,  1 }, { -1, 12,  1 }, {  1, 13,  1 }, { -1, 13,  1 }, {  1, 14,  1 }, { -1, 14,  1 },
358             {  1, 15,  1 }, { -1, 15,  1 }, {  3,  1,  3 }, { -3,  1,  3 }, {  1, 16,  1 }, { -1, 16,  1 },
359             {  1, 17,  1 }, { -1, 17,  1 }, {  1, 18,  1 }, { -1, 18,  1 }, {  1, 19,  1 }, { -1, 19,  1 },
360             {  1, 20,  1 }, { -1, 20,  1 }, {  1, 21,  1 }, { -1, 21,  1 }, {  1, 22,  1 }, { -1, 22,  1 },
361             {  2,  2,  2 }, { -2,  2,  2 }, {  1, 23,  1 }, { -1, 23,  1 }, {  1, 24,  1 }, { -1, 24,  1 },
362             {  1, 25,  1 }, { -1, 25,  1 }, {  4,  1,  3 }, { -4,  1,  3 }, {   EOB    }
363         },
364         //level_add
365         { 0, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1 },
366         2, //golomb_order
367         0, //inc_limit
368         25 //max_run
369     },
370     {
371         { //level / run
372             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  2,  1,  1 },
373             { -2,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  1,  5,  0 },
374             { -1,  5,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  3,  1,  2 }, { -3,  1,  2 }, {  1,  7,  0 },
375             { -1,  7,  0 }, {  1,  8,  0 }, { -1,  8,  0 }, {  2,  2,  1 }, { -2,  2,  1 }, {  1,  9,  0 },
376             { -1,  9,  0 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  4,  1,  2 },
377             { -4,  1,  2 }, {  1, 12,  0 }, { -1, 12,  0 }, {  1, 13,  0 }, { -1, 13,  0 }, {  1, 14,  0 },
378             { -1, 14,  0 }, {  2,  3,  1 }, { -2,  3,  1 }, {  1, 15,  0 }, { -1, 15,  0 }, {  2,  4,  1 },
379             { -2,  4,  1 }, {  5,  1,  3 }, { -5,  1,  3 }, {  3,  2,  2 }, { -3,  2,  2 }, {  1, 16,  0 },
380             { -1, 16,  0 }, {  1, 17,  0 }, { -1, 17,  0 }, {  1, 18,  0 }, { -1, 18,  0 }, {  2,  5,  1 },
381             { -2,  5,  1 }, {  1, 19,  0 }, { -1, 19,  0 }, {  1, 20,  0 }, { -1, 20,  0 }
382         },
383         //level_add
384         { 0, 6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1 },
385         0, //golomb_order
386         1, //inc_limit
387         20 //max_run
388     },
389     {
390         { //level / run
391             {  1,  1,  0 }, { -1,  1,  0 }, {     EOB    }, {  2,  1,  0 }, { -2,  1,  0 }, {  1,  2,  0 },
392             { -1,  2,  0 }, {  3,  1,  1 }, { -3,  1,  1 }, {  1,  3,  0 }, { -1,  3,  0 }, {  4,  1,  1 },
393             { -4,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  1,  4,  0 }, { -1,  4,  0 }, {  5,  1,  2 },
394             { -5,  1,  2 }, {  1,  5,  0 }, { -1,  5,  0 }, {  3,  2,  1 }, { -3,  2,  1 }, {  2,  3,  0 },
395             { -2,  3,  0 }, {  1,  6,  0 }, { -1,  6,  0 }, {  6,  1,  2 }, { -6,  1,  2 }, {  1,  7,  0 },
396             { -1,  7,  0 }, {  2,  4,  0 }, { -2,  4,  0 }, {  7,  1,  2 }, { -7,  1,  2 }, {  1,  8,  0 },
397             { -1,  8,  0 }, {  4,  2,  1 }, { -4,  2,  1 }, {  1,  9,  0 }, { -1,  9,  0 }, {  3,  3,  1 },
398             { -3,  3,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  2,  6,  0 }, { -2,  6,  0 }, {  8,  1,  2 },
399             { -8,  1,  2 }, {  1, 10,  0 }, { -1, 10,  0 }, {  1, 11,  0 }, { -1, 11,  0 }, {  9,  1,  2 },
400             { -9,  1,  2 }, {  5,  2,  2 }, { -5,  2,  2 }, {  3,  4,  1 }, { -3,  4,  1 },
401         },
402         //level_add
403         { 0,10, 6, 4, 4, 3, 3, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
404         1, //golomb_order
405         2, //inc_limit
406         11 //max_run
407     },
408     {
409         { //level / run
410             {     EOB    }, {  1,  1,  0 }, { -1,  1,  0 }, {  2,  1,  0 }, { -2,  1,  0 }, {  3,  1,  0 },
411             { -3,  1,  0 }, {  4,  1,  0 }, { -4,  1,  0 }, {  1,  2,  0 }, { -1,  2,  0 }, {  5,  1,  1 },
412             { -5,  1,  1 }, {  2,  2,  0 }, { -2,  2,  0 }, {  6,  1,  1 }, { -6,  1,  1 }, {  1,  3,  0 },
413             { -1,  3,  0 }, {  7,  1,  1 }, { -7,  1,  1 }, {  3,  2,  0 }, { -3,  2,  0 }, {  8,  1,  1 },
414             { -8,  1,  1 }, {  1,  4,  0 }, { -1,  4,  0 }, {  2,  3,  0 }, { -2,  3,  0 }, {  9,  1,  1 },
415             { -9,  1,  1 }, {  4,  2,  0 }, { -4,  2,  0 }, {  1,  5,  0 }, { -1,  5,  0 }, { 10,  1,  1 },
416             {-10,  1,  1 }, {  3,  3,  0 }, { -3,  3,  0 }, {  5,  2,  1 }, { -5,  2,  1 }, {  2,  4,  0 },
417             { -2,  4,  0 }, { 11,  1,  1 }, {-11,  1,  1 }, {  1,  6,  0 }, { -1,  6,  0 }, { 12,  1,  1 },
418             {-12,  1,  1 }, {  1,  7,  0 }, { -1,  7,  0 }, {  6,  2,  1 }, { -6,  2,  1 }, { 13,  1,  1 },
419             {-13,  1,  1 }, {  2,  5,  0 }, { -2,  5,  0 }, {  1,  8,  0 }, { -1,  8,  0 },
420         },
421         //level_add
422         { 0, 14, 7, 4, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
423         1, //golomb_order
424         4, //inc_limit
425         8  //max_run
426     },
427     {
428         { //level / run
429             {      EOB    }, {  1,  1,  0 }, {  -1,  1,  0 }, {  2,  1,  0 }, {  -2,  1,  0 }, {  3,  1,  0 },
430             {  -3,  1,  0 }, {  4,  1,  0 }, {  -4,  1,  0 }, {  5,  1,  0 }, {  -5,  1,  0 }, {  6,  1,  0 },
431             {  -6,  1,  0 }, {  7,  1,  0 }, {  -7,  1,  0 }, {  8,  1,  0 }, {  -8,  1,  0 }, {  1,  2,  0 },
432             {  -1,  2,  0 }, {  9,  1,  0 }, {  -9,  1,  0 }, { 10,  1,  0 }, { -10,  1,  0 }, { 11,  1,  0 },
433             { -11,  1,  0 }, {  2,  2,  0 }, {  -2,  2,  0 }, { 12,  1,  0 }, { -12,  1,  0 }, { 13,  1,  0 },
434             { -13,  1,  0 }, {  3,  2,  0 }, {  -3,  2,  0 }, { 14,  1,  0 }, { -14,  1,  0 }, {  1,  3,  0 },
435             {  -1,  3,  0 }, { 15,  1,  0 }, { -15,  1,  0 }, {  4,  2,  0 }, {  -4,  2,  0 }, { 16,  1,  0 },
436             { -16,  1,  0 }, { 17,  1,  0 }, { -17,  1,  0 }, {  5,  2,  0 }, {  -5,  2,  0 }, {  1,  4,  0 },
437             {  -1,  4,  0 }, {  2,  3,  0 }, {  -2,  3,  0 }, { 18,  1,  0 }, { -18,  1,  0 }, {  6,  2,  0 },
438             {  -6,  2,  0 }, { 19,  1,  0 }, { -19,  1,  0 }, {  1,  5,  0 }, {  -1,  5,  0 },
439         },
440         //level_add
441         { 0, 20, 7, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
442         0, //golomb_order
443         INT_MAX, //inc_limit
444         5, //max_run
445     }
446 };
447 
448 #undef EOB
449 
450 /*****************************************************************************
451  *
452  * motion vector prediction
453  *
454  ****************************************************************************/
455 
store_mvs(AVSContext * h)456 static inline void store_mvs(AVSContext *h)
457 {
458     h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
459     h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
460     h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
461     h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
462 }
463 
mv_pred_direct(AVSContext * h,cavs_vector * pmv_fw,cavs_vector * col_mv)464 static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
465                                   cavs_vector *col_mv)
466 {
467     cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
468     unsigned den = h->direct_den[col_mv->ref];
469     int m = FF_SIGNBIT(col_mv->x);
470 
471     pmv_fw->dist = h->dist[1];
472     pmv_bw->dist = h->dist[0];
473     pmv_fw->ref = 1;
474     pmv_bw->ref = 0;
475     /* scale the co-located motion vector according to its temporal span */
476     pmv_fw->x =     (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
477     pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
478     m = FF_SIGNBIT(col_mv->y);
479     pmv_fw->y =     (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
480     pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
481 }
482 
mv_pred_sym(AVSContext * h,cavs_vector * src,enum cavs_block size)483 static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
484                                enum cavs_block size)
485 {
486     cavs_vector *dst = src + MV_BWD_OFFS;
487 
488     /* backward mv is the scaled and negated forward mv */
489     dst->x = -((src->x * h->sym_factor + 256) >> 9);
490     dst->y = -((src->y * h->sym_factor + 256) >> 9);
491     dst->ref = 0;
492     dst->dist = h->dist[0];
493     set_mvs(dst, size);
494 }
495 
496 /*****************************************************************************
497  *
498  * residual data decoding
499  *
500  ****************************************************************************/
501 
502 /** kth-order exponential golomb code */
get_ue_code(GetBitContext * gb,int order)503 static inline int get_ue_code(GetBitContext *gb, int order)
504 {
505     unsigned ret = get_ue_golomb(gb);
506     if (ret >= ((1U<<31)>>order)) {
507         av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too larger\n");
508         return AVERROR_INVALIDDATA;
509     }
510     if (order) {
511         return (ret<<order) + get_bits(gb, order);
512     }
513     return ret;
514 }
515 
dequant(AVSContext * h,int16_t * level_buf,uint8_t * run_buf,int16_t * dst,int mul,int shift,int coeff_num)516 static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
517                           int16_t *dst, int mul, int shift, int coeff_num)
518 {
519     int round = 1 << (shift - 1);
520     int pos = -1;
521     const uint8_t *scantab = h->scantable.permutated;
522 
523     /* inverse scan and dequantization */
524     while (--coeff_num >= 0) {
525         pos += run_buf[coeff_num];
526         if (pos > 63) {
527             av_log(h->avctx, AV_LOG_ERROR,
528                    "position out of block bounds at pic %d MB(%d,%d)\n",
529                    h->cur.poc, h->mbx, h->mby);
530             return AVERROR_INVALIDDATA;
531         }
532         dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
533     }
534     return 0;
535 }
536 
537 /**
538  * decode coefficients from one 8x8 block, dequantize, inverse transform
539  *  and add them to sample block
540  * @param r pointer to 2D VLC table
541  * @param esc_golomb_order escape codes are k-golomb with this order k
542  * @param qp quantizer
543  * @param dst location of sample block
544  * @param stride line stride in frame buffer
545  */
decode_residual_block(AVSContext * h,GetBitContext * gb,const struct dec_2dvlc * r,int esc_golomb_order,int qp,uint8_t * dst,ptrdiff_t stride)546 static int decode_residual_block(AVSContext *h, GetBitContext *gb,
547                                  const struct dec_2dvlc *r, int esc_golomb_order,
548                                  int qp, uint8_t *dst, ptrdiff_t stride)
549 {
550     int i, esc_code, level, mask, ret;
551     unsigned int level_code, run;
552     int16_t level_buf[65];
553     uint8_t run_buf[65];
554     int16_t *block = h->block;
555 
556     for (i = 0; i < 65; i++) {
557         level_code = get_ue_code(gb, r->golomb_order);
558         if (level_code >= ESCAPE_CODE) {
559             run      = ((level_code - ESCAPE_CODE) >> 1) + 1;
560             if(run > 64) {
561                 av_log(h->avctx, AV_LOG_ERROR, "run %d is too large\n", run);
562                 return AVERROR_INVALIDDATA;
563             }
564             esc_code = get_ue_code(gb, esc_golomb_order);
565             if (esc_code < 0 || esc_code > 32767) {
566                 av_log(h->avctx, AV_LOG_ERROR, "esc_code invalid\n");
567                 return AVERROR_INVALIDDATA;
568             }
569 
570             level    = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
571             while (level > r->inc_limit)
572                 r++;
573             mask  = -(level_code & 1);
574             level = (level ^ mask) - mask;
575         } else {
576             level = r->rltab[level_code][0];
577             if (!level) //end of block signal
578                 break;
579             run = r->rltab[level_code][1];
580             r  += r->rltab[level_code][2];
581         }
582         level_buf[i] = level;
583         run_buf[i]   = run;
584     }
585     if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
586                       dequant_shift[qp], i)) < 0)
587         return ret;
588     h->cdsp.cavs_idct8_add(dst, block, stride);
589     h->bdsp.clear_block(block);
590     return 0;
591 }
592 
593 
decode_residual_chroma(AVSContext * h)594 static inline int decode_residual_chroma(AVSContext *h)
595 {
596     if (h->cbp & (1 << 4)) {
597         int ret = decode_residual_block(h, &h->gb, chroma_dec, 0,
598                               ff_cavs_chroma_qp[h->qp], h->cu, h->c_stride);
599         if (ret < 0)
600             return ret;
601     }
602     if (h->cbp & (1 << 5)) {
603         int ret = decode_residual_block(h, &h->gb, chroma_dec, 0,
604                               ff_cavs_chroma_qp[h->qp], h->cv, h->c_stride);
605         if (ret < 0)
606             return ret;
607     }
608     return 0;
609 }
610 
decode_residual_inter(AVSContext * h)611 static inline int decode_residual_inter(AVSContext *h)
612 {
613     int block;
614 
615     /* get coded block pattern */
616     int cbp = get_ue_golomb(&h->gb);
617     if (cbp > 63U) {
618         av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp %d\n", cbp);
619         return AVERROR_INVALIDDATA;
620     }
621     h->cbp = cbp_tab[cbp][1];
622 
623     /* get quantizer */
624     if (h->cbp && !h->qp_fixed)
625         h->qp = (h->qp + (unsigned)get_se_golomb(&h->gb)) & 63;
626     for (block = 0; block < 4; block++)
627         if (h->cbp & (1 << block))
628             decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
629                                   h->cy + h->luma_scan[block], h->l_stride);
630     decode_residual_chroma(h);
631 
632     return 0;
633 }
634 
635 /*****************************************************************************
636  *
637  * macroblock level
638  *
639  ****************************************************************************/
640 
set_mv_intra(AVSContext * h)641 static inline void set_mv_intra(AVSContext *h)
642 {
643     h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
644     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
645     h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
646     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
647     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
648         h->col_type_base[h->mbidx] = I_8X8;
649 }
650 
decode_mb_i(AVSContext * h,int cbp_code)651 static int decode_mb_i(AVSContext *h, int cbp_code)
652 {
653     GetBitContext *gb = &h->gb;
654     unsigned pred_mode_uv;
655     int block;
656     uint8_t top[18];
657     uint8_t *left = NULL;
658     uint8_t *d;
659     int ret;
660 
661     ff_cavs_init_mb(h);
662 
663     /* get intra prediction modes from stream */
664     for (block = 0; block < 4; block++) {
665         int nA, nB, predpred;
666         int pos = scan3x3[block];
667 
668         nA = h->pred_mode_Y[pos - 1];
669         nB = h->pred_mode_Y[pos - 3];
670         predpred = FFMIN(nA, nB);
671         if (predpred == NOT_AVAIL) // if either is not available
672             predpred = INTRA_L_LP;
673         if (!get_bits1(gb)) {
674             int rem_mode = get_bits(gb, 2);
675             predpred     = rem_mode + (rem_mode >= predpred);
676         }
677         h->pred_mode_Y[pos] = predpred;
678     }
679     pred_mode_uv = get_ue_golomb_31(gb);
680     if (pred_mode_uv > 6) {
681         av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
682         return AVERROR_INVALIDDATA;
683     }
684     ff_cavs_modify_mb_i(h, &pred_mode_uv);
685 
686     /* get coded block pattern */
687     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
688         cbp_code = get_ue_golomb(gb);
689     if (cbp_code > 63U) {
690         av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
691         return AVERROR_INVALIDDATA;
692     }
693     h->cbp = cbp_tab[cbp_code][0];
694     if (h->cbp && !h->qp_fixed)
695         h->qp = (h->qp + (unsigned)get_se_golomb(gb)) & 63; //qp_delta
696 
697     /* luma intra prediction interleaved with residual decode/transform/add */
698     for (block = 0; block < 4; block++) {
699         d = h->cy + h->luma_scan[block];
700         ff_cavs_load_intra_pred_luma(h, top, &left, block);
701         h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
702             (d, top, left, h->l_stride);
703         if (h->cbp & (1<<block)) {
704             ret = decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
705             if (ret < 0)
706                 return ret;
707         }
708     }
709 
710     /* chroma intra prediction */
711     ff_cavs_load_intra_pred_chroma(h);
712     h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
713                                   h->left_border_u, h->c_stride);
714     h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
715                                   h->left_border_v, h->c_stride);
716 
717     ret = decode_residual_chroma(h);
718     if (ret < 0)
719         return ret;
720     ff_cavs_filter(h, I_8X8);
721     set_mv_intra(h);
722     return 0;
723 }
724 
set_intra_mode_default(AVSContext * h)725 static inline void set_intra_mode_default(AVSContext *h)
726 {
727     if (h->stream_revision > 0) {
728         h->pred_mode_Y[3] =  h->pred_mode_Y[6] = NOT_AVAIL;
729         h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
730     } else {
731         h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;
732         h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
733     }
734 }
735 
decode_mb_p(AVSContext * h,enum cavs_mb mb_type)736 static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
737 {
738     GetBitContext *gb = &h->gb;
739     int ref[4];
740 
741     ff_cavs_init_mb(h);
742     switch (mb_type) {
743     case P_SKIP:
744         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP,  BLK_16X16, 0);
745         break;
746     case P_16X16:
747         ref[0] = h->ref_flag ? 0 : get_bits1(gb);
748         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
749         break;
750     case P_16X8:
751         ref[0] = h->ref_flag ? 0 : get_bits1(gb);
752         ref[2] = h->ref_flag ? 0 : get_bits1(gb);
753         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,    BLK_16X8, ref[0]);
754         ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT,   BLK_16X8, ref[2]);
755         break;
756     case P_8X16:
757         ref[0] = h->ref_flag ? 0 : get_bits1(gb);
758         ref[1] = h->ref_flag ? 0 : get_bits1(gb);
759         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT,     BLK_8X16, ref[0]);
760         ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
761         break;
762     case P_8X8:
763         ref[0] = h->ref_flag ? 0 : get_bits1(gb);
764         ref[1] = h->ref_flag ? 0 : get_bits1(gb);
765         ref[2] = h->ref_flag ? 0 : get_bits1(gb);
766         ref[3] = h->ref_flag ? 0 : get_bits1(gb);
767         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN,   BLK_8X8, ref[0]);
768         ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_8X8, ref[1]);
769         ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN,   BLK_8X8, ref[2]);
770         ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN,   BLK_8X8, ref[3]);
771     }
772     ff_cavs_inter(h, mb_type);
773     set_intra_mode_default(h);
774     store_mvs(h);
775     if (mb_type != P_SKIP)
776         decode_residual_inter(h);
777     ff_cavs_filter(h, mb_type);
778     h->col_type_base[h->mbidx] = mb_type;
779 }
780 
decode_mb_b(AVSContext * h,enum cavs_mb mb_type)781 static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
782 {
783     int block;
784     enum cavs_sub_mb sub_type[4];
785     int flags;
786 
787     ff_cavs_init_mb(h);
788 
789     /* reset all MVs */
790     h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
791     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
792     h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
793     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
794     switch (mb_type) {
795     case B_SKIP:
796     case B_DIRECT:
797         if (!h->col_type_base[h->mbidx]) {
798             /* intra MB at co-location, do in-plane prediction */
799             ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
800             ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
801         } else
802             /* direct prediction from co-located P MB, block-wise */
803             for (block = 0; block < 4; block++)
804                 mv_pred_direct(h, &h->mv[mv_scan[block]],
805                                &h->col_mv[h->mbidx * 4 + block]);
806         break;
807     case B_FWD_16X16:
808         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
809         break;
810     case B_SYM_16X16:
811         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
812         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
813         break;
814     case B_BWD_16X16:
815         ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
816         break;
817     case B_8X8:
818 #define TMP_UNUSED_INX  7
819         flags = 0;
820         for (block = 0; block < 4; block++)
821             sub_type[block] = get_bits(&h->gb, 2);
822         for (block = 0; block < 4; block++) {
823             switch (sub_type[block]) {
824             case B_SUB_DIRECT:
825                 if (!h->col_type_base[h->mbidx]) {
826                     /* intra MB at co-location, do in-plane prediction */
827                     if(flags==0) {
828                         // if col-MB is a Intra MB, current Block size is 16x16.
829                         // AVS standard section 9.9.1
830                         if(block>0){
831                             h->mv[TMP_UNUSED_INX              ] = h->mv[MV_FWD_X0              ];
832                             h->mv[TMP_UNUSED_INX + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
833                         }
834                         ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2,
835                                    MV_PRED_BSKIP, BLK_8X8, 1);
836                         ff_cavs_mv(h, MV_FWD_X0+MV_BWD_OFFS,
837                                    MV_FWD_C2+MV_BWD_OFFS,
838                                    MV_PRED_BSKIP, BLK_8X8, 0);
839                         if(block>0) {
840                             flags = mv_scan[block];
841                             h->mv[flags              ] = h->mv[MV_FWD_X0              ];
842                             h->mv[flags + MV_BWD_OFFS] = h->mv[MV_FWD_X0 + MV_BWD_OFFS];
843                             h->mv[MV_FWD_X0              ] = h->mv[TMP_UNUSED_INX              ];
844                             h->mv[MV_FWD_X0 + MV_BWD_OFFS] = h->mv[TMP_UNUSED_INX + MV_BWD_OFFS];
845                         } else
846                             flags = MV_FWD_X0;
847                     } else {
848                         h->mv[mv_scan[block]              ] = h->mv[flags              ];
849                         h->mv[mv_scan[block] + MV_BWD_OFFS] = h->mv[flags + MV_BWD_OFFS];
850                     }
851                 } else
852                     mv_pred_direct(h, &h->mv[mv_scan[block]],
853                                    &h->col_mv[h->mbidx * 4 + block]);
854                 break;
855             case B_SUB_FWD:
856                 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
857                            MV_PRED_MEDIAN, BLK_8X8, 1);
858                 break;
859             case B_SUB_SYM:
860                 ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
861                            MV_PRED_MEDIAN, BLK_8X8, 1);
862                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
863                 break;
864             }
865         }
866 #undef TMP_UNUSED_INX
867         for (block = 0; block < 4; block++) {
868             if (sub_type[block] == B_SUB_BWD)
869                 ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
870                            mv_scan[block] + MV_BWD_OFFS - 3,
871                            MV_PRED_MEDIAN, BLK_8X8, 0);
872         }
873         break;
874     default:
875         if (mb_type <= B_SYM_16X16) {
876             av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);
877             return AVERROR_INVALIDDATA;
878         }
879         av_assert2(mb_type < B_8X8);
880         flags = ff_cavs_partition_flags[mb_type];
881         if (mb_type & 1) { /* 16x8 macroblock types */
882             if (flags & FWD0)
883                 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);
884             if (flags & SYM0)
885                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
886             if (flags & FWD1)
887                 ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
888             if (flags & SYM1)
889                 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
890             if (flags & BWD0)
891                 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);
892             if (flags & BWD1)
893                 ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
894         } else {          /* 8x16 macroblock types */
895             if (flags & FWD0)
896                 ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
897             if (flags & SYM0)
898                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
899             if (flags & FWD1)
900                 ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
901             if (flags & SYM1)
902                 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
903             if (flags & BWD0)
904                 ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
905             if (flags & BWD1)
906                 ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
907         }
908     }
909     ff_cavs_inter(h, mb_type);
910     set_intra_mode_default(h);
911     if (mb_type != B_SKIP)
912         decode_residual_inter(h);
913     ff_cavs_filter(h, mb_type);
914 
915     return 0;
916 }
917 
918 /*****************************************************************************
919  *
920  * slice level
921  *
922  ****************************************************************************/
923 
decode_slice_header(AVSContext * h,GetBitContext * gb)924 static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
925 {
926     if (h->stc > 0xAF)
927         av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
928 
929     if (h->stc >= h->mb_height) {
930         av_log(h->avctx, AV_LOG_ERROR, "stc 0x%02x is too large\n", h->stc);
931         return AVERROR_INVALIDDATA;
932     }
933 
934     h->mby   = h->stc;
935     h->mbidx = h->mby * h->mb_width;
936 
937     /* mark top macroblocks as unavailable */
938     h->flags &= ~(B_AVAIL | C_AVAIL);
939     if (!h->pic_qp_fixed) {
940         h->qp_fixed = get_bits1(gb);
941         h->qp       = get_bits(gb, 6);
942     }
943     /* inter frame or second slice can have weighting params */
944     if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
945         (!h->pic_structure && h->mby >= h->mb_width / 2))
946         if (get_bits1(gb)) { //slice_weighting_flag
947             av_log(h->avctx, AV_LOG_ERROR,
948                    "weighted prediction not yet supported\n");
949         }
950     return 0;
951 }
952 
check_for_slice(AVSContext * h)953 static inline int check_for_slice(AVSContext *h)
954 {
955     GetBitContext *gb = &h->gb;
956     int align;
957 
958     if (h->mbx)
959         return 0;
960     align = (-get_bits_count(gb)) & 7;
961     /* check for stuffing byte */
962     if (!align && (show_bits(gb, 8) == 0x80))
963         align = 8;
964     if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
965         skip_bits_long(gb, 24 + align);
966         h->stc = get_bits(gb, 8);
967         if (h->stc >= h->mb_height)
968             return 0;
969         decode_slice_header(h, gb);
970         return 1;
971     }
972     return 0;
973 }
974 
975 /*****************************************************************************
976  *
977  * frame level
978  *
979  ****************************************************************************/
980 
decode_pic(AVSContext * h)981 static int decode_pic(AVSContext *h)
982 {
983     int ret;
984     int skip_count    = -1;
985     enum cavs_mb mb_type;
986 
987     if (!h->top_qp) {
988         av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");
989         return AVERROR_INVALIDDATA;
990     }
991 
992     av_frame_unref(h->cur.f);
993 
994     skip_bits(&h->gb, 16);//bbv_dwlay
995     if (h->stc == PIC_PB_START_CODE) {
996         h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
997         if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
998             av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
999             return AVERROR_INVALIDDATA;
1000         }
1001         /* make sure we have the reference frames we need */
1002         if (!h->DPB[0].f->data[0] ||
1003            (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
1004             return AVERROR_INVALIDDATA;
1005     } else {
1006         h->cur.f->pict_type = AV_PICTURE_TYPE_I;
1007         if (get_bits1(&h->gb))
1008             skip_bits(&h->gb, 24);//time_code
1009         /* old sample clips were all progressive and no low_delay,
1010            bump stream revision if detected otherwise */
1011         if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
1012             h->stream_revision = 1;
1013         /* similarly test top_field_first and repeat_first_field */
1014         else if (show_bits(&h->gb, 11) & 3)
1015             h->stream_revision = 1;
1016         if (h->stream_revision > 0)
1017             skip_bits(&h->gb, 1); //marker_bit
1018     }
1019 
1020     ret = ff_get_buffer(h->avctx, h->cur.f, h->cur.f->pict_type == AV_PICTURE_TYPE_B ?
1021                         0 : AV_GET_BUFFER_FLAG_REF);
1022     if (ret < 0)
1023         return ret;
1024 
1025     if (!h->edge_emu_buffer) {
1026         int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
1027         h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
1028         if (!h->edge_emu_buffer)
1029             return AVERROR(ENOMEM);
1030     }
1031 
1032     if ((ret = ff_cavs_init_pic(h)) < 0)
1033         return ret;
1034     h->cur.poc = get_bits(&h->gb, 8) * 2;
1035 
1036     /* get temporal distances and MV scaling factors */
1037     if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1038         h->dist[0] = (h->cur.poc - h->DPB[0].poc) & 511;
1039     } else {
1040         h->dist[0] = (h->DPB[0].poc  - h->cur.poc) & 511;
1041     }
1042     h->dist[1] = (h->cur.poc - h->DPB[1].poc) & 511;
1043     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
1044     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
1045     if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
1046         h->sym_factor = h->dist[0] * h->scale_den[1];
1047         if (FFABS(h->sym_factor) > 32768) {
1048             av_log(h->avctx, AV_LOG_ERROR, "sym_factor %d too large\n", h->sym_factor);
1049             return AVERROR_INVALIDDATA;
1050         }
1051     } else {
1052         h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
1053         h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
1054     }
1055 
1056     if (h->low_delay)
1057         get_ue_golomb(&h->gb); //bbv_check_times
1058     h->progressive   = get_bits1(&h->gb);
1059     h->pic_structure = 1;
1060     if (!h->progressive)
1061         h->pic_structure = get_bits1(&h->gb);
1062     if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
1063         skip_bits1(&h->gb);     //advanced_pred_mode_disable
1064     skip_bits1(&h->gb);        //top_field_first
1065     skip_bits1(&h->gb);        //repeat_first_field
1066     h->pic_qp_fixed =
1067     h->qp_fixed = get_bits1(&h->gb);
1068     h->qp       = get_bits(&h->gb, 6);
1069     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1070         if (!h->progressive && !h->pic_structure)
1071             skip_bits1(&h->gb);//what is this?
1072         skip_bits(&h->gb, 4);   //reserved bits
1073     } else {
1074         if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
1075             h->ref_flag        = get_bits1(&h->gb);
1076         skip_bits(&h->gb, 4);   //reserved bits
1077         h->skip_mode_flag      = get_bits1(&h->gb);
1078     }
1079     h->loop_filter_disable     = get_bits1(&h->gb);
1080     if (!h->loop_filter_disable && get_bits1(&h->gb)) {
1081         h->alpha_offset        = get_se_golomb(&h->gb);
1082         h->beta_offset         = get_se_golomb(&h->gb);
1083         if (   h->alpha_offset < -64 || h->alpha_offset > 64
1084             || h-> beta_offset < -64 || h-> beta_offset > 64) {
1085             h->alpha_offset = h->beta_offset  = 0;
1086             return AVERROR_INVALIDDATA;
1087         }
1088     } else {
1089         h->alpha_offset = h->beta_offset  = 0;
1090     }
1091 
1092     ret = 0;
1093     if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
1094         do {
1095             check_for_slice(h);
1096             ret = decode_mb_i(h, 0);
1097             if (ret < 0)
1098                 break;
1099         } while (ff_cavs_next_mb(h));
1100     } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
1101         do {
1102             if (check_for_slice(h))
1103                 skip_count = -1;
1104             if (h->skip_mode_flag && (skip_count < 0)) {
1105                 if (get_bits_left(&h->gb) < 1) {
1106                     ret = AVERROR_INVALIDDATA;
1107                     break;
1108                 }
1109                 skip_count = get_ue_golomb(&h->gb);
1110             }
1111             if (h->skip_mode_flag && skip_count--) {
1112                 decode_mb_p(h, P_SKIP);
1113             } else {
1114                 if (get_bits_left(&h->gb) < 1) {
1115                     ret = AVERROR_INVALIDDATA;
1116                     break;
1117                 }
1118                 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
1119                 if (mb_type > P_8X8)
1120                     ret = decode_mb_i(h, mb_type - P_8X8 - 1);
1121                 else
1122                     decode_mb_p(h, mb_type);
1123             }
1124             if (ret < 0)
1125                 break;
1126         } while (ff_cavs_next_mb(h));
1127     } else { /* AV_PICTURE_TYPE_B */
1128         do {
1129             if (check_for_slice(h))
1130                 skip_count = -1;
1131             if (h->skip_mode_flag && (skip_count < 0)) {
1132                 if (get_bits_left(&h->gb) < 1) {
1133                     ret = AVERROR_INVALIDDATA;
1134                     break;
1135                 }
1136                 skip_count = get_ue_golomb(&h->gb);
1137             }
1138             if (h->skip_mode_flag && skip_count--) {
1139                 ret = decode_mb_b(h, B_SKIP);
1140             } else {
1141                 if (get_bits_left(&h->gb) < 1) {
1142                     ret = AVERROR_INVALIDDATA;
1143                     break;
1144                 }
1145                 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
1146                 if (mb_type > B_8X8)
1147                     ret = decode_mb_i(h, mb_type - B_8X8 - 1);
1148                 else
1149                     ret = decode_mb_b(h, mb_type);
1150             }
1151             if (ret < 0)
1152                 break;
1153         } while (ff_cavs_next_mb(h));
1154     }
1155     emms_c();
1156     if (ret >= 0 && h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1157         av_frame_unref(h->DPB[1].f);
1158         FFSWAP(AVSFrame, h->cur, h->DPB[1]);
1159         FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
1160     }
1161     return ret;
1162 }
1163 
1164 /*****************************************************************************
1165  *
1166  * headers and interface
1167  *
1168  ****************************************************************************/
1169 
decode_seq_header(AVSContext * h)1170 static int decode_seq_header(AVSContext *h)
1171 {
1172     int frame_rate_code;
1173     int width, height;
1174     int ret;
1175 
1176     h->profile = get_bits(&h->gb, 8);
1177     h->level   = get_bits(&h->gb, 8);
1178     skip_bits1(&h->gb); //progressive sequence
1179 
1180     width  = get_bits(&h->gb, 14);
1181     height = get_bits(&h->gb, 14);
1182     if ((h->width || h->height) && (h->width != width || h->height != height)) {
1183         avpriv_report_missing_feature(h->avctx,
1184                                       "Width/height changing in CAVS");
1185         return AVERROR_PATCHWELCOME;
1186     }
1187     if (width <= 0 || height <= 0) {
1188         av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");
1189         return AVERROR_INVALIDDATA;
1190     }
1191     skip_bits(&h->gb, 2); //chroma format
1192     skip_bits(&h->gb, 3); //sample_precision
1193     h->aspect_ratio = get_bits(&h->gb, 4);
1194     frame_rate_code = get_bits(&h->gb, 4);
1195     if (frame_rate_code == 0 || frame_rate_code > 13) {
1196         av_log(h->avctx, AV_LOG_WARNING,
1197                "frame_rate_code %d is invalid\n", frame_rate_code);
1198         frame_rate_code = 1;
1199     }
1200 
1201     skip_bits(&h->gb, 18); //bit_rate_lower
1202     skip_bits1(&h->gb);    //marker_bit
1203     skip_bits(&h->gb, 12); //bit_rate_upper
1204     h->low_delay =  get_bits1(&h->gb);
1205 
1206     ret = ff_set_dimensions(h->avctx, width, height);
1207     if (ret < 0)
1208         return ret;
1209 
1210     h->width  = width;
1211     h->height = height;
1212     h->mb_width  = (h->width  + 15) >> 4;
1213     h->mb_height = (h->height + 15) >> 4;
1214     h->avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code];
1215     if (!h->top_qp)
1216         return ff_cavs_init_top_lines(h);
1217     return 0;
1218 }
1219 
cavs_flush(AVCodecContext * avctx)1220 static void cavs_flush(AVCodecContext * avctx)
1221 {
1222     AVSContext *h = avctx->priv_data;
1223     h->got_keyframe = 0;
1224 }
1225 
cavs_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)1226 static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1227                              AVPacket *avpkt)
1228 {
1229     AVSContext *h      = avctx->priv_data;
1230     const uint8_t *buf = avpkt->data;
1231     int buf_size       = avpkt->size;
1232     uint32_t stc       = -1;
1233     int input_size, ret;
1234     const uint8_t *buf_end;
1235     const uint8_t *buf_ptr;
1236     int frame_start = 0;
1237 
1238     if (buf_size == 0) {
1239         if (!h->low_delay && h->DPB[0].f->data[0]) {
1240             *got_frame = 1;
1241             av_frame_move_ref(data, h->DPB[0].f);
1242         }
1243         return 0;
1244     }
1245 
1246     h->stc = 0;
1247 
1248     buf_ptr = buf;
1249     buf_end = buf + buf_size;
1250     for(;;) {
1251         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);
1252         if ((stc & 0xFFFFFE00) || buf_ptr == buf_end) {
1253             if (!h->stc)
1254                 av_log(h->avctx, AV_LOG_WARNING, "no frame decoded\n");
1255             return FFMAX(0, buf_ptr - buf);
1256         }
1257         input_size = (buf_end - buf_ptr) * 8;
1258         switch (stc) {
1259         case CAVS_START_CODE:
1260             init_get_bits(&h->gb, buf_ptr, input_size);
1261             decode_seq_header(h);
1262             break;
1263         case PIC_I_START_CODE:
1264             if (!h->got_keyframe) {
1265                 av_frame_unref(h->DPB[0].f);
1266                 av_frame_unref(h->DPB[1].f);
1267                 h->got_keyframe = 1;
1268             }
1269         case PIC_PB_START_CODE:
1270             if (frame_start > 1)
1271                 return AVERROR_INVALIDDATA;
1272             frame_start ++;
1273             if (*got_frame)
1274                 av_frame_unref(data);
1275             *got_frame = 0;
1276             if (!h->got_keyframe)
1277                 break;
1278             init_get_bits(&h->gb, buf_ptr, input_size);
1279             h->stc = stc;
1280             if (decode_pic(h))
1281                 break;
1282             *got_frame = 1;
1283             if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
1284                 if (h->DPB[!h->low_delay].f->data[0]) {
1285                     if ((ret = av_frame_ref(data, h->DPB[!h->low_delay].f)) < 0)
1286                         return ret;
1287                 } else {
1288                     *got_frame = 0;
1289                 }
1290             } else {
1291                 av_frame_move_ref(data, h->cur.f);
1292             }
1293             break;
1294         case EXT_START_CODE:
1295             //mpeg_decode_extension(avctx, buf_ptr, input_size);
1296             break;
1297         case USER_START_CODE:
1298             //mpeg_decode_user_data(avctx, buf_ptr, input_size);
1299             break;
1300         default:
1301             if (stc <= SLICE_MAX_START_CODE) {
1302                 init_get_bits(&h->gb, buf_ptr, input_size);
1303                 decode_slice_header(h, &h->gb);
1304             }
1305             break;
1306         }
1307     }
1308 }
1309 
1310 AVCodec ff_cavs_decoder = {
1311     .name           = "cavs",
1312     .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
1313     .type           = AVMEDIA_TYPE_VIDEO,
1314     .id             = AV_CODEC_ID_CAVS,
1315     .priv_data_size = sizeof(AVSContext),
1316     .init           = ff_cavs_init,
1317     .close          = ff_cavs_end,
1318     .decode         = cavs_decode_frame,
1319     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
1320     .flush          = cavs_flush,
1321 };
1322