FFmpeg
mobiclip.c
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1 /*
2  * MobiClip Video decoder
3  * Copyright (c) 2015-2016 Florian Nouwt
4  * Copyright (c) 2017 Adib Surani
5  * Copyright (c) 2020 Paul B Mahol
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include <inttypes.h>
25 
26 #include "libavutil/avassert.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/thread.h"
29 
30 #include "avcodec.h"
31 #include "bswapdsp.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "get_bits.h"
35 #include "golomb.h"
36 #include "mathops.h"
37 
38 #define MOBI_RL_VLC_BITS 12
39 #define MOBI_MV_VLC_BITS 6
40 
41 static const uint8_t zigzag4x4_tab[] =
42 {
43  0x00, 0x04, 0x01, 0x02, 0x05, 0x08, 0x0C, 0x09, 0x06, 0x03, 0x07, 0x0A,
44  0x0D, 0x0E, 0x0B, 0x0F
45 };
46 
47 static const uint8_t quant4x4_tab[][16] =
48 {
49  { 10, 13, 13, 10, 16, 10, 13, 13, 13, 13, 16, 10, 16, 13, 13, 16 },
50  { 11, 14, 14, 11, 18, 11, 14, 14, 14, 14, 18, 11, 18, 14, 14, 18 },
51  { 13, 16, 16, 13, 20, 13, 16, 16, 16, 16, 20, 13, 20, 16, 16, 20 },
52  { 14, 18, 18, 14, 23, 14, 18, 18, 18, 18, 23, 14, 23, 18, 18, 23 },
53  { 16, 20, 20, 16, 25, 16, 20, 20, 20, 20, 25, 16, 25, 20, 20, 25 },
54  { 18, 23, 23, 18, 29, 18, 23, 23, 23, 23, 29, 18, 29, 23, 23, 29 },
55 };
56 
57 static const uint8_t quant8x8_tab[][64] =
58 {
59  { 20, 19, 19, 25, 18, 25, 19, 24, 24, 19, 20, 18, 32, 18, 20, 19, 19, 24, 24, 19, 19, 25, 18, 25, 18, 25, 18, 25, 19, 24, 24, 19,
60  19, 24, 24, 19, 18, 32, 18, 20, 18, 32, 18, 24, 24, 19, 19, 24, 24, 18, 25, 18, 25, 18, 19, 24, 24, 19, 18, 32, 18, 24, 24, 18,},
61  { 22, 21, 21, 28, 19, 28, 21, 26, 26, 21, 22, 19, 35, 19, 22, 21, 21, 26, 26, 21, 21, 28, 19, 28, 19, 28, 19, 28, 21, 26, 26, 21,
62  21, 26, 26, 21, 19, 35, 19, 22, 19, 35, 19, 26, 26, 21, 21, 26, 26, 19, 28, 19, 28, 19, 21, 26, 26, 21, 19, 35, 19, 26, 26, 19,},
63  { 26, 24, 24, 33, 23, 33, 24, 31, 31, 24, 26, 23, 42, 23, 26, 24, 24, 31, 31, 24, 24, 33, 23, 33, 23, 33, 23, 33, 24, 31, 31, 24,
64  24, 31, 31, 24, 23, 42, 23, 26, 23, 42, 23, 31, 31, 24, 24, 31, 31, 23, 33, 23, 33, 23, 24, 31, 31, 24, 23, 42, 23, 31, 31, 23,},
65  { 28, 26, 26, 35, 25, 35, 26, 33, 33, 26, 28, 25, 45, 25, 28, 26, 26, 33, 33, 26, 26, 35, 25, 35, 25, 35, 25, 35, 26, 33, 33, 26,
66  26, 33, 33, 26, 25, 45, 25, 28, 25, 45, 25, 33, 33, 26, 26, 33, 33, 25, 35, 25, 35, 25, 26, 33, 33, 26, 25, 45, 25, 33, 33, 25,},
67  { 32, 30, 30, 40, 28, 40, 30, 38, 38, 30, 32, 28, 51, 28, 32, 30, 30, 38, 38, 30, 30, 40, 28, 40, 28, 40, 28, 40, 30, 38, 38, 30,
68  30, 38, 38, 30, 28, 51, 28, 32, 28, 51, 28, 38, 38, 30, 30, 38, 38, 28, 40, 28, 40, 28, 30, 38, 38, 30, 28, 51, 28, 38, 38, 28,},
69  { 36, 34, 34, 46, 32, 46, 34, 43, 43, 34, 36, 32, 58, 32, 36, 34, 34, 43, 43, 34, 34, 46, 32, 46, 32, 46, 32, 46, 34, 43, 43, 34,
70  34, 43, 43, 34, 32, 58, 32, 36, 32, 58, 32, 43, 43, 34, 34, 43, 43, 32, 46, 32, 46, 32, 34, 43, 43, 34, 32, 58, 32, 43, 43, 32,},
71 };
72 
73 static const uint8_t block4x4_coefficients_tab[] =
74 {
75  15, 0, 2, 1, 4, 8, 12, 3, 11, 13, 14, 7, 10, 5, 9, 6,
76 };
77 
78 static const uint8_t pframe_block4x4_coefficients_tab[] =
79 {
80  0, 4, 1, 8, 2, 12, 3, 5, 10, 15, 7, 13, 14, 11, 9, 6,
81 };
82 
83 static const uint8_t block8x8_coefficients_tab[] =
84 {
85  0x00, 0x1F, 0x3F, 0x0F, 0x08, 0x04, 0x02, 0x01, 0x0B, 0x0E, 0x1B, 0x0D,
86  0x03, 0x07, 0x0C, 0x17, 0x1D, 0x0A, 0x1E, 0x05, 0x10, 0x2F, 0x37, 0x3B,
87  0x13, 0x3D, 0x3E, 0x09, 0x1C, 0x06, 0x15, 0x1A, 0x33, 0x11, 0x12, 0x14,
88  0x18, 0x20, 0x3C, 0x35, 0x19, 0x16, 0x3A, 0x30, 0x31, 0x32, 0x27, 0x34,
89  0x2B, 0x2D, 0x39, 0x38, 0x23, 0x36, 0x2E, 0x21, 0x25, 0x22, 0x24, 0x2C,
90  0x2A, 0x28, 0x29, 0x26,
91 };
92 
93 static const uint8_t pframe_block8x8_coefficients_tab[] =
94 {
95  0x00, 0x0F, 0x04, 0x01, 0x08, 0x02, 0x0C, 0x03, 0x05, 0x0A, 0x0D, 0x07, 0x0E, 0x0B, 0x1F, 0x09,
96  0x06, 0x10, 0x3F, 0x1E, 0x17, 0x1D, 0x1B, 0x1C, 0x13, 0x18, 0x1A, 0x12, 0x11, 0x14, 0x15, 0x20,
97  0x2F, 0x16, 0x19, 0x37, 0x3D, 0x3E, 0x3B, 0x3C, 0x33, 0x35, 0x21, 0x24, 0x22, 0x28, 0x23, 0x2C,
98  0x30, 0x27, 0x2D, 0x25, 0x3A, 0x2B, 0x2E, 0x2A, 0x31, 0x34, 0x38, 0x32, 0x29, 0x26, 0x39, 0x36
99 };
100 
101 static const uint8_t run_residue[2][256] =
102 {
103  {
104  12, 6, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
105  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
106  3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
107  1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
108  1, 27, 11, 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, 1, 1, 1, 1,
109  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
110  1, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
111  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
112  },
113  {
114  27, 10, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
115  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
116  8, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
117  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
118  1, 15, 10, 8, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
119  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
120  1, 21, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
121  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
122  },
123 };
124 
125 static const uint8_t bits0[] = {
126  9, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
127  10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12,
128  12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 7, 10, 10, 9,
129  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
130  9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
131  8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6,
132  6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 2, 3, 4, 4,
133 };
134 
135 static const uint16_t syms0[] = {
136  0x0, 0x822, 0x803, 0xB, 0xA, 0xB81, 0xB61, 0xB41, 0xB21, 0x122,
137  0x102, 0xE2, 0xC2, 0xA2, 0x63, 0x43, 0x24, 0xC, 0x25, 0x2E1, 0x301,
138  0xBA1, 0xBC1, 0xBE1, 0xC01, 0x26, 0x44, 0x83, 0xA3, 0xC3, 0x142,
139  0x321, 0x341, 0xC21, 0xC41, 0xC61, 0xC81, 0xCA1, 0xCC1, 0xCE1, 0xD01,
140  0x0, 0x9, 0x8, 0xB01, 0xAE1, 0xAC1, 0xAA1, 0xA81, 0xA61, 0xA41, 0xA21,
141  0x802, 0x2C1, 0x2A1, 0x281, 0x261, 0x241, 0x221, 0x201, 0x1E1, 0x82,
142  0x62, 0x7, 0x6, 0xA01, 0x9E1, 0x9C1, 0x9A1, 0x981, 0x961, 0x941, 0x921,
143  0x1C1, 0x1A1, 0x42, 0x23, 0x5, 0x901, 0x8E1, 0x8C1, 0x8A1, 0x181, 0x161,
144  0x141, 0x4, 0x881, 0x861, 0x841, 0x821, 0x121, 0x101, 0xE1, 0xC1, 0x22,
145  0x3, 0xA1, 0x81, 0x61, 0x801, 0x1, 0x21, 0x41, 0x2,
146 };
147 
148 static const uint16_t syms1[] = {
149  0x0, 0x807, 0x806, 0x16, 0x15, 0x842, 0x823, 0x805, 0x1A1, 0xA3, 0x102, 0x83,
150  0x64, 0x44, 0x27, 0x14, 0x13, 0x17, 0x18, 0x28, 0x122, 0x862, 0x882, 0x9E1, 0xA01,
151  0x19, 0x1A, 0x1B, 0x29, 0xC3, 0x2A, 0x45, 0xE3, 0x1C1, 0x808, 0x8A2, 0x8C2, 0xA21,
152  0xA41, 0xA61, 0xA81, 0x0, 0x12, 0x11, 0x9C1, 0x9A1, 0x981, 0x961, 0x941, 0x822, 0x804,
153  0x181, 0x161, 0xE2, 0xC2, 0xA2, 0x63, 0x43, 0x26, 0x25, 0x10, 0x82, 0xF, 0xE, 0xD, 0x901,
154  0x8E1, 0x8C1, 0x803, 0x141, 0x121, 0x101, 0x921, 0x62, 0x24, 0xC, 0xB, 0xA, 0x881, 0x861,
155  0xC1, 0x8A1, 0xE1, 0x42, 0x23, 0x9, 0x802, 0xA1, 0x841, 0x821, 0x81, 0x61, 0x8, 0x7, 0x22,
156  0x6, 0x41, 0x5, 0x4, 0x801, 0x1, 0x2, 0x21, 0x3,
157 };
158 
159 static const uint8_t mv_len[16] =
160 {
161  10, 8, 8, 7, 8, 8, 8, 7, 8, 8, 8, 7, 7, 7, 7, 6,
162 };
163 
164 static const uint8_t mv_bits[2][16][10] =
165 {
166  {
167  { 2, 3, 3, 5, 5, 4, 4, 5, 5, 2 },
168  { 2, 3, 4, 4, 3, 4, 4, 2 },
169  { 3, 4, 4, 2, 4, 4, 3, 2 },
170  { 1, 3, 4, 5, 5, 3, 3 },
171  { 2, 4, 4, 3, 3, 4, 4, 2 },
172  { 2, 3, 4, 4, 4, 4, 3, 2 },
173  { 2, 3, 4, 4, 4, 4, 3, 2 },
174  { 2, 2, 3, 4, 5, 5, 2 },
175  { 2, 3, 4, 4, 3, 4, 4, 2 },
176  { 2, 4, 4, 3, 4, 4, 3, 2 },
177  { 2, 3, 3, 5, 5, 4, 3, 2 },
178  { 2, 3, 4, 4, 3, 3, 2 },
179  { 1, 4, 4, 3, 3, 4, 4 },
180  { 2, 3, 4, 4, 3, 3, 2 },
181  { 2, 3, 4, 4, 3, 3, 2 },
182  { 3, 3, 2, 2, 3, 3 },
183  },
184  {
185  { 3, 4, 5, 5, 3, 5, 6, 6, 4, 1 },
186  { 2, 3, 4, 5, 5, 2, 3, 3 },
187  { 2, 4, 4, 3, 3, 4, 4, 2 },
188  { 1, 4, 4, 3, 4, 4, 3 },
189  { 3, 3, 2, 4, 5, 5, 3, 2 },
190  { 3, 4, 4, 3, 3, 3, 3, 2 },
191  { 1, 3, 3, 4, 4, 4, 5, 5 },
192  { 1, 4, 4, 3, 3, 4, 4 },
193  { 2, 4, 4, 3, 3, 4, 4, 2 },
194  { 1, 3, 3, 4, 4, 4, 5, 5 },
195  { 2, 3, 4, 4, 4, 4, 3, 2 },
196  { 2, 3, 3, 4, 4, 3, 2 },
197  { 1, 4, 4, 3, 3, 4, 4 },
198  { 1, 4, 4, 3, 3, 4, 4 },
199  { 2, 3, 3, 4, 4, 3, 2 },
200  { 2, 3, 3, 3, 3, 2 },
201  }
202 };
203 
204 static const uint8_t mv_syms[2][16][10] =
205 {
206  {
207  { 1, 8, 9, 4, 3, 2, 7, 5, 6, 0 },
208  { 0, 9, 5, 4, 2, 3, 8, 1 },
209  { 3, 9, 5, 0, 4, 8, 2, 1 },
210  { 1, 3, 4, 8, 5, 2, 0 },
211  { 0, 5, 4, 8, 2, 3, 9, 1 },
212  { 0, 3, 5, 9, 4, 8, 2, 1 },
213  { 0, 3, 9, 5, 8, 4, 2, 1 },
214  { 0, 2, 3, 4, 8, 5, 1 },
215  { 0, 3, 8, 4, 2, 5, 9, 1 },
216  { 2, 8, 9, 3, 5, 4, 0, 1 },
217  { 0, 4, 3, 8, 9, 5, 2, 1 },
218  { 0, 4, 8, 5, 3, 2, 1 },
219  { 1, 9, 4, 2, 0, 5, 3 },
220  { 2, 4, 9, 5, 3, 0, 1 },
221  { 0, 4, 9, 5, 3, 2, 1 },
222  { 5, 4, 1, 0, 3, 2 },
223  },
224  {
225  { 8, 2, 3, 6, 1, 7, 5, 4, 9, 0 },
226  { 9, 2, 3, 5, 4, 1, 8, 0 },
227  { 0, 5, 4, 2, 9, 3, 8, 1 },
228  { 1, 5, 4, 2, 8, 3, 0 },
229  { 2, 9, 8, 3, 5, 4, 0, 1 },
230  { 3, 5, 4, 2, 9, 8, 0, 1 },
231  { 1, 2, 0, 9, 8, 3, 5, 4 },
232  { 1, 8, 5, 2, 0, 4, 3 },
233  { 0, 5, 4, 2, 8, 3, 9, 1 },
234  { 1, 2, 0, 9, 8, 3, 5, 4 },
235  { 0, 3, 9, 8, 5, 4, 2, 1 },
236  { 0, 4, 3, 8, 5, 2, 1 },
237  { 1, 5, 4, 2, 0, 9, 3 },
238  { 1, 9, 5, 2, 0, 4, 3 },
239  { 0, 5, 3, 9, 4, 2, 1 },
240  { 0, 4, 5, 3, 2, 1 },
241  }
242 };
243 
244 typedef struct BlockXY {
245  int w, h;
246  int ax, ay;
247  int x, y;
248  int size;
249  uint8_t *block;
250  int linesize;
251 } BlockXY;
252 
253 typedef struct MotionXY {
254  int x, y;
255 } MotionXY;
256 
257 typedef struct MobiClipContext {
258  AVFrame *pic[6];
259 
260  int current_pic;
261  int moflex;
262  int dct_tab_idx;
263  int quantizer;
264 
265  GetBitContext gb;
266 
267  uint8_t *bitstream;
268  int bitstream_size;
269 
270  int qtab[2][64];
271  uint8_t pre[32];
272  MotionXY *motion;
273  int motion_size;
274 
275  BswapDSPContext bdsp;
276 } MobiClipContext;
277 
278 static const VLCElem *rl_vlc[2];
279 static const VLCElem *mv_vlc[2][16];
280 
281 static av_cold void mobiclip_init_static(void)
282 {
283  static VLCElem vlc_buf[(2 << MOBI_RL_VLC_BITS) + (2 * 16 << MOBI_MV_VLC_BITS)];
284  VLCInitState state =VLC_INIT_STATE(vlc_buf);
285 
286  for (int i = 0; i < 2; i++) {
287  rl_vlc[i] =
288  ff_vlc_init_tables_from_lengths(&state, MOBI_RL_VLC_BITS, 104,
289  bits0, sizeof(*bits0),
290  i ? syms1 : syms0, sizeof(*syms0), sizeof(*syms0),
291  0, 0);
292  for (int j = 0; j < 16; j++) {
293  mv_vlc[i][j] =
294  ff_vlc_init_tables_from_lengths(&state, MOBI_MV_VLC_BITS, mv_len[j],
295  mv_bits[i][j], sizeof(*mv_bits[i][j]),
296  mv_syms[i][j], sizeof(*mv_syms[i][j]), sizeof(*mv_syms[i][j]),
297  0, 0);
298  }
299  }
300 }
301 
302 static av_cold int mobiclip_init(AVCodecContext *avctx)
303 {
304  static AVOnce init_static_once = AV_ONCE_INIT;
305  MobiClipContext *s = avctx->priv_data;
306 
307  if (avctx->width & 15 || avctx->height & 15) {
308  av_log(avctx, AV_LOG_ERROR, "width/height not multiple of 16\n");
309  return AVERROR_INVALIDDATA;
310  }
311 
312  ff_bswapdsp_init(&s->bdsp);
313 
314  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
315 
316  s->motion = av_calloc(avctx->width / 16 + 3, sizeof(MotionXY));
317  if (!s->motion)
318  return AVERROR(ENOMEM);
319  s->motion_size = (avctx->width / 16 + 3) * sizeof(MotionXY);
320 
321  for (int i = 0; i < 6; i++) {
322  s->pic[i] = av_frame_alloc();
323  if (!s->pic[i])
324  return AVERROR(ENOMEM);
325  }
326 
327  ff_thread_once(&init_static_once, mobiclip_init_static);
328 
329  return 0;
330 }
331 
332 static int setup_qtables(AVCodecContext *avctx, int64_t quantizer)
333 {
334  MobiClipContext *s = avctx->priv_data;
335  int qx, qy;
336 
337  if (quantizer < 12 || quantizer > 161)
338  return AVERROR_INVALIDDATA;
339 
340  s->quantizer = quantizer;
341 
342  qx = quantizer % 6;
343  qy = quantizer / 6;
344 
345  for (int i = 0; i < 16; i++)
346  s->qtab[0][i] = quant4x4_tab[qx][i] << qy;
347 
348  for (int i = 0; i < 64; i++)
349  s->qtab[1][i] = quant8x8_tab[qx][i] << (qy - 2);
350 
351  for (int i = 0; i < 20; i++)
352  s->pre[i] = 9;
353 
354  return 0;
355 }
356 
357 static void inverse4(unsigned *rs)
358 {
359  unsigned a = rs[0] + rs[2];
360  unsigned b = rs[0] - rs[2];
361  unsigned c = rs[1] + ((int)rs[3] >> 1);
362  unsigned d = ((int)rs[1] >> 1) - rs[3];
363 
364  rs[0] = a + c;
365  rs[1] = b + d;
366  rs[2] = b - d;
367  rs[3] = a - c;
368 }
369 
370 static void idct(int *arr, int size)
371 {
372  int e, f, g, h;
373  unsigned x3, x2, x1, x0;
374  int tmp[4];
375 
376  if (size == 4) {
377  inverse4(arr);
378  return;
379  }
380 
381  tmp[0] = arr[0];
382  tmp[1] = arr[2];
383  tmp[2] = arr[4];
384  tmp[3] = arr[6];
385 
386  inverse4(tmp);
387 
388  e = (unsigned)arr[7] + arr[1] - arr[3] - (arr[3] >> 1);
389  f = (unsigned)arr[7] - arr[1] + arr[5] + (arr[5] >> 1);
390  g = (unsigned)arr[5] - arr[3] - arr[7] - (arr[7] >> 1);
391  h = (unsigned)arr[5] + arr[3] + arr[1] + (arr[1] >> 1);
392  x3 = (unsigned)g + (h >> 2);
393  x2 = (unsigned)e + (f >> 2);
394  x1 = (e >> 2) - (unsigned)f;
395  x0 = (unsigned)h - (g >> 2);
396 
397  arr[0] = tmp[0] + x0;
398  arr[1] = tmp[1] + x1;
399  arr[2] = tmp[2] + x2;
400  arr[3] = tmp[3] + x3;
401  arr[4] = tmp[3] - x3;
402  arr[5] = tmp[2] - x2;
403  arr[6] = tmp[1] - x1;
404  arr[7] = tmp[0] - x0;
405 }
406 
407 static void read_run_encoding(AVCodecContext *avctx,
408  int *last, int *run, int *level)
409 {
410  MobiClipContext *s = avctx->priv_data;
411  GetBitContext *gb = &s->gb;
412  int n = get_vlc2(gb, rl_vlc[s->dct_tab_idx], MOBI_RL_VLC_BITS, 1);
413 
414  *last = (n >> 11) == 1;
415  *run = (n >> 5) & 0x3F;
416  *level = n & 0x1F;
417 }
418 
419 static int add_coefficients(AVCodecContext *avctx, AVFrame *frame,
420  int bx, int by, int size, int plane)
421 {
422  MobiClipContext *s = avctx->priv_data;
423  GetBitContext *gb = &s->gb;
424  int mat[64] = { 0 };
425  const uint8_t *ztab = size == 8 ? ff_zigzag_direct : zigzag4x4_tab;
426  const int *qtab = s->qtab[size == 8];
427  uint8_t *dst = frame->data[plane] + by * frame->linesize[plane] + bx;
428 
429  for (int pos = 0; get_bits_left(gb) > 0; pos++) {
430  int qval, last, run, level;
431 
432  read_run_encoding(avctx, &last, &run, &level);
433 
434  if (level) {
435  if (get_bits1(gb))
436  level = -level;
437  } else if (!get_bits1(gb)) {
438  read_run_encoding(avctx, &last, &run, &level);
439  level += run_residue[s->dct_tab_idx][(last ? 64 : 0) + run];
440  if (get_bits1(gb))
441  level = -level;
442  } else if (!get_bits1(gb)) {
443  read_run_encoding(avctx, &last, &run, &level);
444  run += run_residue[s->dct_tab_idx][128 + (last ? 64 : 0) + level];
445  if (get_bits1(gb))
446  level = -level;
447  } else {
448  last = get_bits1(gb);
449  run = get_bits(gb, 6);
450  level = get_sbits(gb, 12);
451  }
452 
453  pos += run;
454  if (pos >= size * size)
455  return AVERROR_INVALIDDATA;
456  qval = qtab[pos];
457  mat[ztab[pos]] = qval *(unsigned)level;
458 
459  if (last)
460  break;
461  }
462 
463  mat[0] += 32;
464  for (int y = 0; y < size; y++)
465  idct(&mat[y * size], size);
466 
467  for (int y = 0; y < size; y++) {
468  for (int x = y + 1; x < size; x++) {
469  int a = mat[x * size + y];
470  int b = mat[y * size + x];
471 
472  mat[y * size + x] = a;
473  mat[x * size + y] = b;
474  }
475 
476  idct(&mat[y * size], size);
477  for (int x = 0; x < size; x++)
478  dst[x] = av_clip_uint8(dst[x] + (mat[y * size + x] >> 6));
479  dst += frame->linesize[plane];
480  }
481 
482  return 0;
483 }
484 
485 static int add_pframe_coefficients(AVCodecContext *avctx, AVFrame *frame,
486  int bx, int by, int size, int plane)
487 {
488  MobiClipContext *s = avctx->priv_data;
489  GetBitContext *gb = &s->gb;
490  int ret, idx = get_ue_golomb_31(gb);
491 
492  if (idx == 0) {
493  return add_coefficients(avctx, frame, bx, by, size, plane);
494  } else if ((unsigned)idx < FF_ARRAY_ELEMS(pframe_block4x4_coefficients_tab)) {
495  int flags = pframe_block4x4_coefficients_tab[idx];
496 
497  for (int y = by; y < by + 8; y += 4) {
498  for (int x = bx; x < bx + 8; x += 4) {
499  if (flags & 1) {
500  ret = add_coefficients(avctx, frame, x, y, 4, plane);
501  if (ret < 0)
502  return ret;
503  }
504  flags >>= 1;
505  }
506  }
507  return 0;
508  } else {
509  return AVERROR_INVALIDDATA;
510  }
511 }
512 
513 static int adjust(int x, int size)
514 {
515  return size == 16 ? (x + 1) >> 1 : x;
516 }
517 
518 static uint8_t pget(BlockXY b)
519 {
520  BlockXY ret = b;
521  int x, y;
522 
523  if (b.x == -1 && b.y >= b.size) {
524  ret.x = -1, ret.y = b.size - 1;
525  } else if (b.x >= -1 && b.y >= -1) {
526  ret.x = b.x, ret.y = b.y;
527  } else if (b.x == -1 && b.y == -2) {
528  ret.x = 0, ret.y = -1;
529  } else if (b.x == -2 && b.y == -1) {
530  ret.x = -1, ret.y = 0;
531  }
532 
533  y = av_clip(ret.ay + ret.y, 0, ret.h - 1);
534  x = av_clip(ret.ax + ret.x, 0, ret.w - 1);
535 
536  return ret.block[y * ret.linesize + x];
537 }
538 
539 static uint8_t half(int a, int b)
540 {
541  return ((a + b) + 1) / 2;
542 }
543 
544 static uint8_t half3(int a, int b, int c)
545 {
546  return ((a + b + b + c) * 2 / 4 + 1) / 2;
547 }
548 
549 static uint8_t pick_above(BlockXY bxy)
550 {
551  bxy.y = bxy.y - 1;
552 
553  return pget(bxy);
554 }
555 
556 static uint8_t pick_left(BlockXY bxy)
557 {
558  bxy.x = bxy.x - 1;
559 
560  return pget(bxy);
561 }
562 
563 static uint8_t half_horz(BlockXY bxy)
564 {
565  BlockXY a = bxy, b = bxy, c = bxy;
566 
567  a.x -= 1;
568  c.x += 1;
569 
570  return half3(pget(a), pget(b), pget(c));
571 }
572 
573 static uint8_t half_vert(BlockXY bxy)
574 {
575  BlockXY a = bxy, b = bxy, c = bxy;
576 
577  a.y -= 1;
578  c.y += 1;
579 
580  return half3(pget(a), pget(b), pget(c));
581 }
582 
583 static uint8_t pick_4(BlockXY bxy)
584 {
585  int val;
586 
587  if ((bxy.x % 2) == 0) {
588  BlockXY ba, bb;
589  int a, b;
590 
591  ba = bxy;
592  ba.x = -1;
593  ba.y = bxy.y + bxy.x / 2;
594  a = pget(ba);
595 
596  bb = bxy;
597  bb.x = -1;
598  bb.y = bxy.y + bxy.x / 2 + 1;
599  b = pget(bb);
600 
601  val = half(a, b);
602  } else {
603  BlockXY ba;
604 
605  ba = bxy;
606  ba.x = -1;
607  ba.y = bxy.y + bxy.x / 2 + 1;
608  val = half_vert(ba);
609  }
610 
611  return val;
612 }
613 
614 static uint8_t pick_5(BlockXY bxy)
615 {
616  int val;
617 
618  if (bxy.x == 0) {
619  BlockXY a = bxy;
620  BlockXY b = bxy;
621 
622  a.x = -1;
623  a.y -= 1;
624 
625  b.x = -1;
626 
627  val = half(pget(a), pget(b));
628  } else if (bxy.y == 0) {
629  BlockXY a = bxy;
630 
631  a.x -= 2;
632  a.y -= 1;
633 
634  val = half_horz(a);
635  } else if (bxy.x == 1) {
636  BlockXY a = bxy;
637 
638  a.x -= 2;
639  a.y -= 1;
640 
641  val = half_vert(a);
642  } else {
643  BlockXY a = bxy;
644 
645  a.x -= 2;
646  a.y -= 1;
647 
648  val = pget(a);
649  }
650 
651  return val;
652 }
653 
654 static uint8_t pick_6(BlockXY bxy)
655 {
656  int val;
657 
658  if (bxy.y == 0) {
659  BlockXY a = bxy;
660  BlockXY b = bxy;
661 
662  a.x -= 1;
663  a.y = -1;
664 
665  b.y = -1;
666 
667  val = half(pget(a), pget(b));
668  } else if (bxy.x == 0) {
669  BlockXY a = bxy;
670 
671  a.x -= 1;
672  a.y -= 2;
673 
674  val = half_vert(a);
675  } else if (bxy.y == 1) {
676  BlockXY a = bxy;
677 
678  a.x -= 1;
679  a.y -= 2;
680 
681  val = half_horz(a);
682  } else {
683  BlockXY a = bxy;
684 
685  a.x -= 1;
686  a.y -= 2;
687 
688  val = pget(a);
689  }
690 
691  return val;
692 }
693 
694 static uint8_t pick_7(BlockXY bxy)
695 {
696  int clr, acc1, acc2;
697  BlockXY a = bxy;
698 
699  a.x -= 1;
700  a.y -= 1;
701  clr = pget(a);
702  if (bxy.x && bxy.y)
703  return clr;
704 
705  if (bxy.x == 0) {
706  a.x = -1;
707  a.y = bxy.y;
708  } else {
709  a.x = bxy.x - 2;
710  a.y = -1;
711  }
712  acc1 = pget(a);
713 
714  if (bxy.y == 0) {
715  a.x = bxy.x;
716  a.y = -1;
717  } else {
718  a.x = -1;
719  a.y = bxy.y - 2;
720  }
721  acc2 = pget(a);
722 
723  return half3(acc1, clr, acc2);
724 }
725 
726 static uint8_t pick_8(BlockXY bxy)
727 {
728  BlockXY ba = bxy;
729  BlockXY bb = bxy;
730  int val;
731 
732  if (bxy.y == 0) {
733  int a, b;
734 
735  ba.y = -1;
736  a = pget(ba);
737 
738  bb.x += 1;
739  bb.y = -1;
740 
741  b = pget(bb);
742 
743  val = half(a, b);
744  } else if (bxy.y == 1) {
745  ba.x += 1;
746  ba.y -= 2;
747 
748  val = half_horz(ba);
749  } else if (bxy.x < bxy.size - 1) {
750  ba.x += 1;
751  ba.y -= 2;
752 
753  val = pget(ba);
754  } else if (bxy.y % 2 == 0) {
755  int a, b;
756 
757  ba.x = bxy.y / 2 + bxy.size - 1;
758  ba.y = -1;
759  a = pget(ba);
760 
761  bb.x = bxy.y / 2 + bxy.size;
762  bb.y = -1;
763 
764  b = pget(bb);
765 
766  val = half(a, b);
767  } else {
768  ba.x = bxy.y / 2 + bxy.size;
769  ba.y = -1;
770 
771  val = half_horz(ba);
772  }
773 
774  return val;
775 }
776 
777 static void block_fill_simple(uint8_t *block, int size, int linesize, int fill)
778 {
779  for (int y = 0; y < size; y++) {
780  memset(block, fill, size);
781  block += linesize;
782  }
783 }
784 
785 static void block_fill(uint8_t *block, int size, int linesize,
786  int w, int h, int ax, int ay,
787  uint8_t (*pick)(BlockXY bxy))
788 {
789  BlockXY bxy;
790 
791  bxy.size = size;
792  bxy.block = block;
793  bxy.linesize = linesize;
794  bxy.w = w;
795  bxy.h = h;
796  bxy.ay = ay;
797  bxy.ax = ax;
798 
799  for (int y = 0; y < size; y++) {
800  bxy.y = y;
801  for (int x = 0; x < size; x++) {
802  uint8_t val;
803 
804  bxy.x = x;
805 
806  val = pick(bxy);
807 
808  block[ax + x + (ay + y) * linesize] = val;
809  }
810  }
811 }
812 
813 static int block_sum(const uint8_t *block, int w, int h, int linesize)
814 {
815  int sum = 0;
816 
817  for (int y = 0; y < h; y++) {
818  for (int x = 0; x < w; x++) {
819  sum += block[x];
820  }
821  block += linesize;
822  }
823 
824  return sum;
825 }
826 
827 static int predict_intra(AVCodecContext *avctx, AVFrame *frame, int ax, int ay,
828  int pmode, int add_coeffs, int size, int plane)
829 {
830  MobiClipContext *s = avctx->priv_data;
831  GetBitContext *gb = &s->gb;
832  int w = avctx->width >> !!plane, h = avctx->height >> !!plane;
833  int ret = 0;
834 
835  switch (pmode) {
836  case 0:
837  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_above);
838  break;
839  case 1:
840  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_left);
841  break;
842  case 2:
843  {
844  int arr1[16];
845  int arr2[16];
846  uint8_t *top = frame->data[plane] + FFMAX(ay - 1, 0) * frame->linesize[plane] + ax;
847  uint8_t *left = frame->data[plane] + ay * frame->linesize[plane] + FFMAX(ax - 1, 0);
848  int bottommost = frame->data[plane][(ay + size - 1) * frame->linesize[plane] + FFMAX(ax - 1, 0)];
849  int rightmost = frame->data[plane][FFMAX(ay - 1, 0) * frame->linesize[plane] + ax + size - 1];
850  int avg = (bottommost + rightmost + 1) / 2 + 2 * av_clip(get_se_golomb(gb), -(1<<16), 1<<16);
851  int r6 = adjust(avg - bottommost, size);
852  int r9 = adjust(avg - rightmost, size);
853  int shift = adjust(size, size) == 8 ? 3 : 2;
854  uint8_t *block;
855 
856  for (int x = 0; x < size; x++) {
857  int val = top[x];
858  arr1[x] = adjust(((bottommost - val) * (1 << shift)) + r6 * (x + 1), size);
859  }
860 
861  for (int y = 0; y < size; y++) {
862  int val = left[y * frame->linesize[plane]];
863  arr2[y] = adjust(((rightmost - val) * (1 << shift)) + r9 * (y + 1), size);
864  }
865 
866  block = frame->data[plane] + ay * frame->linesize[plane] + ax;
867  for (int y = 0; y < size; y++) {
868  for (int x = 0; x < size; x++) {
869  block[x] = (((top[x] + left[0] + ((arr1[x] * (y + 1) +
870  arr2[y] * (x + 1)) >> 2 * shift)) + 1) / 2) & 0xFF;
871  }
872  block += frame->linesize[plane];
873  left += frame->linesize[plane];
874  }
875  }
876  break;
877  case 3:
878  {
879  uint8_t fill;
880 
881  if (ax == 0 && ay == 0) {
882  fill = 0x80;
883  } else if (ax >= 1 && ay >= 1) {
884  int left = block_sum(frame->data[plane] + ay * frame->linesize[plane] + ax - 1,
885  1, size, frame->linesize[plane]);
886  int top = block_sum(frame->data[plane] + (ay - 1) * frame->linesize[plane] + ax,
887  size, 1, frame->linesize[plane]);
888 
889  fill = ((left + top) * 2 / (2 * size) + 1) / 2;
890  } else if (ax >= 1) {
891  fill = (block_sum(frame->data[plane] + ay * frame->linesize[plane] + ax - 1,
892  1, size, frame->linesize[plane]) * 2 / size + 1) / 2;
893  } else if (ay >= 1) {
894  fill = (block_sum(frame->data[plane] + (ay - 1) * frame->linesize[plane] + ax,
895  size, 1, frame->linesize[plane]) * 2 / size + 1) / 2;
896  } else {
897  return -1;
898  }
899 
900  block_fill_simple(frame->data[plane] + ay * frame->linesize[plane] + ax,
901  size, frame->linesize[plane], fill);
902  }
903  break;
904  case 4:
905  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_4);
906  break;
907  case 5:
908  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_5);
909  break;
910  case 6:
911  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_6);
912  break;
913  case 7:
914  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_7);
915  break;
916  case 8:
917  block_fill(frame->data[plane], size, frame->linesize[plane], w, h, ax, ay, pick_8);
918  break;
919  }
920 
921  if (add_coeffs)
922  ret = add_coefficients(avctx, frame, ax, ay, size, plane);
923 
924  return ret;
925 }
926 
927 static int get_prediction(AVCodecContext *avctx, int x, int y, int size)
928 {
929  MobiClipContext *s = avctx->priv_data;
930  GetBitContext *gb = &s->gb;
931  int index = (y & 0xC) | (x / 4 % 4);
932 
933  uint8_t val = FFMIN(s->pre[index], index % 4 == 0 ? 9 : s->pre[index + 3]);
934  if (val == 9)
935  val = 3;
936 
937  if (!get_bits1(gb)) {
938  int x = get_bits(gb, 3);
939  val = x + (x >= val ? 1 : 0);
940  }
941 
942  s->pre[index + 4] = val;
943  if (size == 8)
944  s->pre[index + 5] = s->pre[index + 8] = s->pre[index + 9] = val;
945 
946  return val;
947 }
948 
949 static int process_block(AVCodecContext *avctx, AVFrame *frame,
950  int x, int y, int pmode, int has_coeffs, int plane)
951 {
952  MobiClipContext *s = avctx->priv_data;
953  GetBitContext *gb = &s->gb;
954  int tmp, ret;
955 
956  if (!has_coeffs) {
957  if (pmode < 0)
958  pmode = get_prediction(avctx, x, y, 8);
959  return predict_intra(avctx, frame, x, y, pmode, 0, 8, plane);
960  }
961 
962  tmp = get_ue_golomb_31(gb);
963  if ((unsigned)tmp > FF_ARRAY_ELEMS(block4x4_coefficients_tab))
964  return AVERROR_INVALIDDATA;
965 
966  if (tmp == 0) {
967  if (pmode < 0)
968  pmode = get_prediction(avctx, x, y, 8);
969  ret = predict_intra(avctx, frame, x, y, pmode, 1, 8, plane);
970  } else {
971  int flags = block4x4_coefficients_tab[tmp - 1];
972 
973  for (int by = y; by < y + 8; by += 4) {
974  for (int bx = x; bx < x + 8; bx += 4) {
975  int new_pmode = pmode;
976 
977  if (new_pmode < 0)
978  new_pmode = get_prediction(avctx, bx, by, 4);
979  ret = predict_intra(avctx, frame, bx, by, new_pmode, flags & 1, 4, plane);
980  if (ret < 0)
981  return ret;
982  flags >>= 1;
983  }
984  }
985  }
986 
987  return ret;
988 }
989 
990 static int decode_macroblock(AVCodecContext *avctx, AVFrame *frame,
991  int x, int y, int predict)
992 {
993  MobiClipContext *s = avctx->priv_data;
994  GetBitContext *gb = &s->gb;
995  int flags, pmode_uv, idx = get_ue_golomb(gb);
996  int ret = 0;
997 
998  if (idx < 0 || idx >= FF_ARRAY_ELEMS(block8x8_coefficients_tab))
999  return AVERROR_INVALIDDATA;
1000 
1001  flags = block8x8_coefficients_tab[idx];
1002 
1003  if (predict) {
1004  ret = process_block(avctx, frame, x, y, -1, flags & 1, 0);
1005  if (ret < 0)
1006  return ret;
1007  flags >>= 1;
1008  ret = process_block(avctx, frame, x + 8, y, -1, flags & 1, 0);
1009  if (ret < 0)
1010  return ret;
1011  flags >>= 1;
1012  ret = process_block(avctx, frame, x, y + 8, -1, flags & 1, 0);
1013  if (ret < 0)
1014  return ret;
1015  flags >>= 1;
1016  ret = process_block(avctx, frame, x + 8, y + 8, -1, flags & 1, 0);
1017  if (ret < 0)
1018  return ret;
1019  flags >>= 1;
1020  } else {
1021  int pmode = get_bits(gb, 3);
1022 
1023  if (pmode == 2) {
1024  ret = predict_intra(avctx, frame, x, y, pmode, 0, 16, 0);
1025  if (ret < 0)
1026  return ret;
1027  pmode = 9;
1028  }
1029 
1030  ret = process_block(avctx, frame, x, y, pmode, flags & 1, 0);
1031  if (ret < 0)
1032  return ret;
1033  flags >>= 1;
1034  ret = process_block(avctx, frame, x + 8, y, pmode, flags & 1, 0);
1035  if (ret < 0)
1036  return ret;
1037  flags >>= 1;
1038  ret = process_block(avctx, frame, x, y + 8, pmode, flags & 1, 0);
1039  if (ret < 0)
1040  return ret;
1041  flags >>= 1;
1042  ret = process_block(avctx, frame, x + 8, y + 8, pmode, flags & 1, 0);
1043  if (ret < 0)
1044  return ret;
1045  flags >>= 1;
1046  }
1047 
1048  pmode_uv = get_bits(gb, 3);
1049  if (pmode_uv == 2) {
1050  ret = predict_intra(avctx, frame, x >> 1, y >> 1, pmode_uv, 0, 8, 1 + !s->moflex);
1051  if (ret < 0)
1052  return ret;
1053  ret = predict_intra(avctx, frame, x >> 1, y >> 1, pmode_uv, 0, 8, 2 - !s->moflex);
1054  if (ret < 0)
1055  return ret;
1056  pmode_uv = 9;
1057  }
1058 
1059  ret = process_block(avctx, frame, x >> 1, y >> 1, pmode_uv, flags & 1, 1 + !s->moflex);
1060  if (ret < 0)
1061  return ret;
1062  flags >>= 1;
1063  ret = process_block(avctx, frame, x >> 1, y >> 1, pmode_uv, flags & 1, 2 - !s->moflex);
1064  if (ret < 0)
1065  return ret;
1066 
1067  return 0;
1068 }
1069 
1070 static int get_index(int x)
1071 {
1072  return x == 16 ? 0 : x == 8 ? 1 : x == 4 ? 2 : x == 2 ? 3 : 0;
1073 }
1074 
1075 static int predict_motion(AVCodecContext *avctx,
1076  int width, int height, int index,
1077  int offsetm, int offsetx, int offsety)
1078 {
1079  MobiClipContext *s = avctx->priv_data;
1080  MotionXY *motion = s->motion;
1081  GetBitContext *gb = &s->gb;
1082  int fheight = avctx->height;
1083  int fwidth = avctx->width;
1084 
1085  if (index <= 5) {
1086  int sidx = -FFMAX(1, index) + s->current_pic;
1087  MotionXY mv = s->motion[0];
1088 
1089  if (sidx < 0)
1090  sidx += 6;
1091 
1092  if (index > 0) {
1093  mv.x = mv.x + (unsigned)get_se_golomb(gb);
1094  mv.y = mv.y + (unsigned)get_se_golomb(gb);
1095  }
1096  if (mv.x >= INT_MAX || mv.y >= INT_MAX)
1097  return AVERROR_INVALIDDATA;
1098 
1099  motion[offsetm].x = mv.x;
1100  motion[offsetm].y = mv.y;
1101 
1102  for (int i = 0; i < 3; i++) {
1103  int method, src_linesize, dst_linesize;
1104  uint8_t *src, *dst;
1105 
1106  if (i == 1) {
1107  offsetx = offsetx >> 1;
1108  offsety = offsety >> 1;
1109  mv.x = mv.x >> 1;
1110  mv.y = mv.y >> 1;
1111  width = width >> 1;
1112  height = height >> 1;
1113  fwidth = fwidth >> 1;
1114  fheight = fheight >> 1;
1115  }
1116 
1117  av_assert0(s->pic[sidx]);
1118  av_assert0(s->pic[s->current_pic]);
1119  av_assert0(s->pic[s->current_pic]->data[i]);
1120  if (!s->pic[sidx]->data[i])
1121  return AVERROR_INVALIDDATA;
1122 
1123  method = (mv.x & 1) | ((mv.y & 1) << 1);
1124  src_linesize = s->pic[sidx]->linesize[i];
1125  dst_linesize = s->pic[s->current_pic]->linesize[i];
1126  dst = s->pic[s->current_pic]->data[i] + offsetx + offsety * dst_linesize;
1127 
1128  if (offsetx + (mv.x >> 1) < 0 ||
1129  offsety + (mv.y >> 1) < 0 ||
1130  offsetx + width + (mv.x + 1 >> 1) > fwidth ||
1131  offsety + height + (mv.y + 1 >> 1) > fheight)
1132  return AVERROR_INVALIDDATA;
1133 
1134  switch (method) {
1135  case 0:
1136  src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
1137  (offsety + (mv.y >> 1)) * src_linesize;
1138  for (int y = 0; y < height; y++) {
1139  for (int x = 0; x < width; x++)
1140  dst[x] = src[x];
1141  dst += dst_linesize;
1142  src += src_linesize;
1143  }
1144  break;
1145  case 1:
1146  src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
1147  (offsety + (mv.y >> 1)) * src_linesize;
1148  for (int y = 0; y < height; y++) {
1149  for (int x = 0; x < width; x++) {
1150  dst[x] = (uint8_t)((src[x] >> 1) + (src[x + 1] >> 1));
1151  }
1152 
1153  dst += dst_linesize;
1154  src += src_linesize;
1155  }
1156  break;
1157  case 2:
1158  src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
1159  (offsety + (mv.y >> 1)) * src_linesize;
1160  for (int y = 0; y < height; y++) {
1161  for (int x = 0; x < width; x++) {
1162  dst[x] = (uint8_t)((src[x] >> 1) + (src[x + src_linesize] >> 1));
1163  }
1164 
1165  dst += dst_linesize;
1166  src += src_linesize;
1167  }
1168  break;
1169  case 3:
1170  src = s->pic[sidx]->data[i] + offsetx + (mv.x >> 1) +
1171  (offsety + (mv.y >> 1)) * src_linesize;
1172  for (int y = 0; y < height; y++) {
1173  for (int x = 0; x < width; x++) {
1174  dst[x] = (uint8_t)((((src[x] >> 1) + (src[x + 1] >> 1)) >> 1) +
1175  (((src[x + src_linesize] >> 1) + (src[x + 1 + src_linesize] >> 1)) >> 1));
1176  }
1177 
1178  dst += dst_linesize;
1179  src += src_linesize;
1180  }
1181  break;
1182  }
1183  }
1184  } else {
1185  int tidx;
1186  int adjx = index == 8 ? 0 : width / 2;
1187  int adjy = index == 8 ? height / 2 : 0;
1188 
1189  width = width - adjx;
1190  height = height - adjy;
1191  tidx = get_index(height) * 4 + get_index(width);
1192 
1193  for (int i = 0; i < 2; i++) {
1194  int ret, idx2;
1195 
1196  idx2 = get_vlc2(gb, mv_vlc[s->moflex][tidx], MOBI_MV_VLC_BITS, 1);
1197 
1198  ret = predict_motion(avctx, width, height, idx2,
1199  offsetm, offsetx + i * adjx, offsety + i * adjy);
1200  if (ret < 0)
1201  return ret;
1202  }
1203  }
1204 
1205  return 0;
1206 }
1207 
1208 static int mobiclip_decode(AVCodecContext *avctx, AVFrame *rframe,
1209  int *got_frame, AVPacket *pkt)
1210 {
1211  MobiClipContext *s = avctx->priv_data;
1212  GetBitContext *gb = &s->gb;
1213  AVFrame *frame = s->pic[s->current_pic];
1214  int ret;
1215 
1216  if (avctx->height/16 * (avctx->width/16) * 2 > 8LL*FFALIGN(pkt->size, 2))
1217  return AVERROR_INVALIDDATA;
1218 
1219  av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
1220  pkt->size);
1221 
1222  if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
1223  return ret;
1224 
1225  s->bdsp.bswap16_buf((uint16_t *)s->bitstream,
1226  (uint16_t *)pkt->data,
1227  (pkt->size + 1) >> 1);
1228 
1229  ret = init_get_bits8(gb, s->bitstream, FFALIGN(pkt->size, 2));
1230  if (ret < 0)
1231  return ret;
1232 
1233  if (get_bits1(gb)) {
1234  frame->pict_type = AV_PICTURE_TYPE_I;
1235  frame->flags |= AV_FRAME_FLAG_KEY;
1236  s->moflex = get_bits1(gb);
1237  s->dct_tab_idx = get_bits1(gb);
1238 
1239  ret = setup_qtables(avctx, get_bits(gb, 6));
1240  if (ret < 0)
1241  return ret;
1242 
1243  for (int y = 0; y < avctx->height; y += 16) {
1244  for (int x = 0; x < avctx->width; x += 16) {
1245  ret = decode_macroblock(avctx, frame, x, y, get_bits1(gb));
1246  if (ret < 0)
1247  return ret;
1248  }
1249  }
1250  } else {
1251  MotionXY *motion = s->motion;
1252 
1253  memset(motion, 0, s->motion_size);
1254 
1255  frame->pict_type = AV_PICTURE_TYPE_P;
1256  frame->flags &= ~AV_FRAME_FLAG_KEY;
1257  s->dct_tab_idx = 0;
1258 
1259  ret = setup_qtables(avctx, s->quantizer + (int64_t)get_se_golomb(gb));
1260  if (ret < 0)
1261  return ret;
1262 
1263  for (int y = 0; y < avctx->height; y += 16) {
1264  for (int x = 0; x < avctx->width; x += 16) {
1265  int idx;
1266 
1267  motion[0].x = mid_pred(motion[x / 16 + 1].x, motion[x / 16 + 2].x, motion[x / 16 + 3].x);
1268  motion[0].y = mid_pred(motion[x / 16 + 1].y, motion[x / 16 + 2].y, motion[x / 16 + 3].y);
1269  motion[x / 16 + 2].x = 0;
1270  motion[x / 16 + 2].y = 0;
1271 
1272  idx = get_vlc2(gb, mv_vlc[s->moflex][0], MOBI_MV_VLC_BITS, 1);
1273 
1274  if (idx == 6 || idx == 7) {
1275  ret = decode_macroblock(avctx, frame, x, y, idx == 7);
1276  if (ret < 0)
1277  return ret;
1278  } else {
1279  int flags, idx2;
1280  ret = predict_motion(avctx, 16, 16, idx, x / 16 + 2, x, y);
1281  if (ret < 0)
1282  return ret;
1283  idx2 = get_ue_golomb(gb);
1284  if (idx2 >= FF_ARRAY_ELEMS(pframe_block8x8_coefficients_tab))
1285  return AVERROR_INVALIDDATA;
1286  flags = pframe_block8x8_coefficients_tab[idx2];
1287 
1288  for (int sy = y; sy < y + 16; sy += 8) {
1289  for (int sx = x; sx < x + 16; sx += 8) {
1290  if (flags & 1)
1291  add_pframe_coefficients(avctx, frame, sx, sy, 8, 0);
1292  flags >>= 1;
1293  }
1294  }
1295 
1296  if (flags & 1)
1297  add_pframe_coefficients(avctx, frame, x >> 1, y >> 1, 8, 1 + !s->moflex);
1298  flags >>= 1;
1299  if (flags & 1)
1300  add_pframe_coefficients(avctx, frame, x >> 1, y >> 1, 8, 2 - !s->moflex);
1301  }
1302  }
1303  }
1304  }
1305 
1306  if (!s->moflex)
1307  avctx->colorspace = AVCOL_SPC_YCGCO;
1308 
1309  s->current_pic = (s->current_pic + 1) % 6;
1310  ret = av_frame_ref(rframe, frame);
1311  if (ret < 0)
1312  return ret;
1313  *got_frame = 1;
1314 
1315  return 0;
1316 }
1317 
1318 static void mobiclip_flush(AVCodecContext *avctx)
1319 {
1320  MobiClipContext *s = avctx->priv_data;
1321 
1322  for (int i = 0; i < 6; i++)
1323  av_frame_unref(s->pic[i]);
1324 }
1325 
1326 static av_cold int mobiclip_close(AVCodecContext *avctx)
1327 {
1328  MobiClipContext *s = avctx->priv_data;
1329 
1330  av_freep(&s->bitstream);
1331  s->bitstream_size = 0;
1332  av_freep(&s->motion);
1333  s->motion_size = 0;
1334 
1335  for (int i = 0; i < 6; i++) {
1336  av_frame_free(&s->pic[i]);
1337  }
1338 
1339  return 0;
1340 }
1341 
1342 const FFCodec ff_mobiclip_decoder = {
1343  .p.name = "mobiclip",
1344  CODEC_LONG_NAME("MobiClip Video"),
1345  .p.type = AVMEDIA_TYPE_VIDEO,
1346  .p.id = AV_CODEC_ID_MOBICLIP,
1347  .priv_data_size = sizeof(MobiClipContext),
1348  .init = mobiclip_init,
1349  FF_CODEC_DECODE_CB(mobiclip_decode),
1350  .flush = mobiclip_flush,
1351  .close = mobiclip_close,
1352  .p.capabilities = AV_CODEC_CAP_DR1,
1353  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
1354 };
MobiClipContext::dct_tab_idx
int dct_tab_idx
Definition: mobiclip.c:262
mobiclip_flush
static void mobiclip_flush(AVCodecContext *avctx)
Definition: mobiclip.c:1318
bswapdsp.h
level
uint8_t level
Definition: svq3.c:205
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#define av_clip
Definition: common.h:99
MOBI_RL_VLC_BITS
#define MOBI_RL_VLC_BITS
Definition: mobiclip.c:38
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:695
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
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static uint8_t pick_7(BlockXY bxy)
Definition: mobiclip.c:694
MOBI_MV_VLC_BITS
#define MOBI_MV_VLC_BITS
Definition: mobiclip.c:39
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uint8_t pre[32]
Definition: mobiclip.c:271
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enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:685
thread.h
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static void block_fill_simple(uint8_t *block, int size, int linesize, int fill)
Definition: mobiclip.c:777
AV_CODEC_ID_MOBICLIP
@ AV_CODEC_ID_MOBICLIP
Definition: codec_id.h:304
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static uint8_t pick_left(BlockXY bxy)
Definition: mobiclip.c:556
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static const int8_t mv[256][2]
Definition: 4xm.c:81
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static int block_sum(const uint8_t *block, int w, int h, int linesize)
Definition: mobiclip.c:813
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static int setup_qtables(AVCodecContext *avctx, int64_t quantizer)
Definition: mobiclip.c:332
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static void block_fill(uint8_t *block, int size, int linesize, int w, int h, int ax, int ay, uint8_t(*pick)(BlockXY bxy))
Definition: mobiclip.c:785
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static const uint8_t mv_bits[2][16][10]
Definition: mobiclip.c:164
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:160
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static const uint8_t quant8x8_tab[][64]
Definition: mobiclip.c:57
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static uint8_t half3(int a, int b, int c)
Definition: mobiclip.c:544
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
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static uint8_t tmp[11]
Definition: aes_ctr.c:28
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Definition: llviddspenc.c:38
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static int get_ue_golomb(GetBitContext *gb)
Read an unsigned Exp-Golomb code in the range 0 to 8190.
Definition: golomb.h:53
MobiClipContext
Definition: mobiclip.c:257
MobiClipContext::quantizer
int quantizer
Definition: mobiclip.c:263
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uint8_t * data
Definition: packet.h:524
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static const uint8_t pframe_block4x4_coefficients_tab[]
Definition: mobiclip.c:78
MobiClipContext::moflex
int moflex
Definition: mobiclip.c:261
b
#define b
Definition: input.c:41
half
static uint8_t half(int a, int b)
Definition: mobiclip.c:539
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int qtab[2][64]
Definition: mobiclip.c:270
FFCodec
Definition: codec_internal.h:126
BlockXY::linesize
int linesize
Definition: mobiclip.c:250
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
MobiClipContext::motion
MotionXY * motion
Definition: mobiclip.c:272
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exp golomb vlc stuff
pframe_block8x8_coefficients_tab
static const uint8_t pframe_block8x8_coefficients_tab[]
Definition: mobiclip.c:93
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
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static uint8_t pick_5(BlockXY bxy)
Definition: mobiclip.c:614
syms1
static const uint16_t syms1[]
Definition: mobiclip.c:148
GetBitContext
Definition: get_bits.h:108
val
static double val(void *priv, double ch)
Definition: aeval.c:78
MobiClipContext::current_pic
int current_pic
Definition: mobiclip.c:260
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AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
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static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
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AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
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int ay
Definition: mobiclip.c:246
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:545
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:625
VLCInitState
For static VLCs, the number of bits can often be hardcoded at each get_vlc2() callsite.
Definition: vlc.h:212
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#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
s
#define s(width, name)
Definition: cbs_vp9.c:198
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static const uint8_t quant4x4_tab[][16]
Definition: mobiclip.c:47
adjust
static int adjust(int x, int size)
Definition: mobiclip.c:513
g
const char * g
Definition: vf_curves.c:128
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uint8_t * block
Definition: mobiclip.c:249
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#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
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static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:320
MotionXY
Definition: mobiclip.c:253
decode.h
get_bits.h
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
get_se_golomb
static int get_se_golomb(GetBitContext *gb)
read signed exp golomb code.
Definition: golomb.h:239
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
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static const VLCElem * rl_vlc[2]
Definition: mobiclip.c:278
mobiclip_close
static av_cold int mobiclip_close(AVCodecContext *avctx)
Definition: mobiclip.c:1326
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static const uint16_t syms0[]
Definition: mobiclip.c:135
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
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Definition: svq3.c:204
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
mathops.h
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Definition: mobiclip.c:827
AVCOL_SPC_YCGCO
@ AVCOL_SPC_YCGCO
used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
Definition: pixfmt.h:618
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
AVOnce
#define AVOnce
Definition: thread.h:202
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int index
Definition: gxfenc.c:90
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
MobiClipContext::pic
AVFrame * pic[6]
Definition: mobiclip.c:258
f
f
Definition: af_crystalizer.c:121
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
mv_len
static const uint8_t mv_len[16]
Definition: mobiclip.c:159
AVPacket::size
int size
Definition: packet.h:525
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:384
codec_internal.h
shift
static int shift(int a, int b)
Definition: bonk.c:261
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
get_index
static int get_index(int x)
Definition: mobiclip.c:1070
size
int size
Definition: twinvq_data.h:10344
BlockXY::x
int x
Definition: mobiclip.c:247
VLCElem
Definition: vlc.h:32
ff_mobiclip_decoder
const FFCodec ff_mobiclip_decoder
Definition: mobiclip.c:1342
avg
#define avg(a, b, c, d)
Definition: colorspacedsp_template.c:28
decode_macroblock
static int decode_macroblock(AVCodecContext *avctx, AVFrame *frame, int x, int y, int predict)
Definition: mobiclip.c:990
BlockXY::size
int size
Definition: mobiclip.c:248
BlockXY::w
int w
Definition: mobiclip.c:245
run_residue
static const uint8_t run_residue[2][256]
Definition: mobiclip.c:101
predict_motion
static int predict_motion(AVCodecContext *avctx, int width, int height, int index, int offsetm, int offsetx, int offsety)
Definition: mobiclip.c:1075
height
#define height
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
BlockXY::h
int h
Definition: mobiclip.c:245
half_horz
static uint8_t half_horz(BlockXY bxy)
Definition: mobiclip.c:563
MotionXY::x
int x
Definition: mobiclip.c:254
get_prediction
static int get_prediction(AVCodecContext *avctx, int x, int y, int size)
Definition: mobiclip.c:927
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
pick_8
static uint8_t pick_8(BlockXY bxy)
Definition: mobiclip.c:726
predict
static av_always_inline void predict(PredictorState *ps, float *coef, int output_enable)
Definition: aacdec.c:177
av_fast_padded_malloc
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:52
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
block8x8_coefficients_tab
static const uint8_t block8x8_coefficients_tab[]
Definition: mobiclip.c:83
pick_above
static uint8_t pick_above(BlockXY bxy)
Definition: mobiclip.c:549
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:606
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
MobiClipContext::gb
GetBitContext gb
Definition: mobiclip.c:265
pick_6
static uint8_t pick_6(BlockXY bxy)
Definition: mobiclip.c:654
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:264
mobiclip_decode
static int mobiclip_decode(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *pkt)
Definition: mobiclip.c:1208
avcodec.h
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
mid_pred
#define mid_pred
Definition: mathops.h:98
BlockXY::y
int y
Definition: mobiclip.c:247
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1665
ret
ret
Definition: filter_design.txt:187
bits0
static const uint8_t bits0[]
Definition: mobiclip.c:125
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
read_run_encoding
static void read_run_encoding(AVCodecContext *avctx, int *last, int *run, int *level)
Definition: mobiclip.c:407
add_pframe_coefficients
static int add_pframe_coefficients(AVCodecContext *avctx, AVFrame *frame, int bx, int by, int size, int plane)
Definition: mobiclip.c:485
pos
unsigned int pos
Definition: spdifenc.c:414
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
half_vert
static uint8_t half_vert(BlockXY bxy)
Definition: mobiclip.c:573
MobiClipContext::bdsp
BswapDSPContext bdsp
Definition: mobiclip.c:275
AVCodecContext
main external API structure.
Definition: avcodec.h:445
get_ue_golomb_31
static int get_ue_golomb_31(GetBitContext *gb)
read unsigned exp golomb code, constraint to a max of 31.
Definition: golomb.h:120
process_block
static int process_block(AVCodecContext *avctx, AVFrame *frame, int x, int y, int pmode, int has_coeffs, int plane)
Definition: mobiclip.c:949
mobiclip_init_static
static av_cold void mobiclip_init_static(void)
Definition: mobiclip.c:281
inverse4
static void inverse4(unsigned *rs)
Definition: mobiclip.c:357
block4x4_coefficients_tab
static const uint8_t block4x4_coefficients_tab[]
Definition: mobiclip.c:73
zigzag4x4_tab
static const uint8_t zigzag4x4_tab[]
Definition: mobiclip.c:41
mv_vlc
static const VLCElem * mv_vlc[2][16]
Definition: mobiclip.c:279
BlockXY
Definition: mobiclip.c:244
av_clip_uint8
#define av_clip_uint8
Definition: common.h:105
mobiclip_init
static av_cold int mobiclip_init(AVCodecContext *avctx)
Definition: mobiclip.c:302
pget
static uint8_t pget(BlockXY b)
Definition: mobiclip.c:518
ff_vlc_init_tables_from_lengths
const av_cold VLCElem * ff_vlc_init_tables_from_lengths(VLCInitState *state, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags)
Definition: vlc.c:366
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
MotionXY::y
int y
Definition: mobiclip.c:254
pick_4
static uint8_t pick_4(BlockXY bxy)
Definition: mobiclip.c:583
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
VLC_INIT_STATE
#define VLC_INIT_STATE(_table)
Definition: vlc.h:217
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
idct
static void idct(int *arr, int size)
Definition: mobiclip.c:370
d
d
Definition: ffmpeg_filter.c:424
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
BswapDSPContext
Definition: bswapdsp.h:24
h
h
Definition: vp9dsp_template.c:2038
MobiClipContext::motion_size
int motion_size
Definition: mobiclip.c:273
int
int
Definition: ffmpeg_filter.c:424
add_coefficients
static int add_coefficients(AVCodecContext *avctx, AVFrame *frame, int bx, int by, int size, int plane)
Definition: mobiclip.c:419
MobiClipContext::bitstream
uint8_t * bitstream
Definition: mobiclip.c:267
MobiClipContext::bitstream_size
int bitstream_size
Definition: mobiclip.c:268
mv_syms
static const uint8_t mv_syms[2][16][10]
Definition: mobiclip.c:204
state
static struct @408 state
BlockXY::ax
int ax
Definition: mobiclip.c:246
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