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1 | /* | ||
2 | * MPEG-1/2 decoder | ||
3 | * Copyright (c) 2000, 2001 Fabrice Bellard | ||
4 | * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | /** | ||
24 | * @file | ||
25 | * MPEG-1/2 decoder | ||
26 | */ | ||
27 | |||
28 | #define UNCHECKED_BITSTREAM_READER 1 | ||
29 | |||
30 | #include "libavutil/attributes.h" | ||
31 | #include "libavutil/avassert.h" | ||
32 | #include "libavutil/thread.h" | ||
33 | |||
34 | #include "mpegvideo.h" | ||
35 | #include "mpeg12codecs.h" | ||
36 | #include "mpeg12data.h" | ||
37 | #include "mpeg12dec.h" | ||
38 | #include "mpegutils.h" | ||
39 | #include "rl.h" | ||
40 | |||
41 | static const uint8_t table_mb_ptype[7][2] = { | ||
42 | { 3, 5 }, // 0x01 MB_INTRA | ||
43 | { 1, 2 }, // 0x02 MB_PAT | ||
44 | { 1, 3 }, // 0x08 MB_FOR | ||
45 | { 1, 1 }, // 0x0A MB_FOR|MB_PAT | ||
46 | { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA | ||
47 | { 1, 5 }, // 0x12 MB_QUANT|MB_PAT | ||
48 | { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT | ||
49 | }; | ||
50 | |||
51 | static const uint8_t table_mb_btype[11][2] = { | ||
52 | { 3, 5 }, // 0x01 MB_INTRA | ||
53 | { 2, 3 }, // 0x04 MB_BACK | ||
54 | { 3, 3 }, // 0x06 MB_BACK|MB_PAT | ||
55 | { 2, 4 }, // 0x08 MB_FOR | ||
56 | { 3, 4 }, // 0x0A MB_FOR|MB_PAT | ||
57 | { 2, 2 }, // 0x0C MB_FOR|MB_BACK | ||
58 | { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT | ||
59 | { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA | ||
60 | { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT | ||
61 | { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT | ||
62 | { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT | ||
63 | }; | ||
64 | |||
65 | static const int16_t ptype2mb_type[7] = { | ||
66 | MB_TYPE_INTRA, | ||
67 | MB_TYPE_FORWARD_MV | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, | ||
68 | MB_TYPE_FORWARD_MV, | ||
69 | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
70 | MB_TYPE_QUANT | MB_TYPE_INTRA, | ||
71 | MB_TYPE_QUANT | MB_TYPE_FORWARD_MV | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, | ||
72 | MB_TYPE_QUANT | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
73 | }; | ||
74 | |||
75 | static const int16_t btype2mb_type[11] = { | ||
76 | MB_TYPE_INTRA, | ||
77 | MB_TYPE_BACKWARD_MV, | ||
78 | MB_TYPE_BACKWARD_MV | MB_TYPE_CBP, | ||
79 | MB_TYPE_FORWARD_MV, | ||
80 | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
81 | MB_TYPE_BIDIR_MV, | ||
82 | MB_TYPE_BIDIR_MV | MB_TYPE_CBP, | ||
83 | MB_TYPE_QUANT | MB_TYPE_INTRA, | ||
84 | MB_TYPE_QUANT | MB_TYPE_BACKWARD_MV | MB_TYPE_CBP, | ||
85 | MB_TYPE_QUANT | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
86 | MB_TYPE_QUANT | MB_TYPE_BIDIR_MV | MB_TYPE_CBP, | ||
87 | }; | ||
88 | |||
89 | 289 | av_cold void ff_init_2d_vlc_rl(const uint16_t table_vlc[][2], RL_VLC_ELEM rl_vlc[], | |
90 | const int8_t table_run[], const uint8_t table_level[], | ||
91 | int n, unsigned static_size, int flags) | ||
92 | { | ||
93 | int i; | ||
94 | 289 | VLCElem table[680] = { 0 }; | |
95 | 289 | VLC vlc = { .table = table, .table_allocated = static_size }; | |
96 |
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289 | av_assert0(static_size <= FF_ARRAY_ELEMS(table)); |
97 | 289 | vlc_init(&vlc, TEX_VLC_BITS, n + 2, &table_vlc[0][1], 4, 2, &table_vlc[0][0], 4, 2, VLC_INIT_USE_STATIC | flags); | |
98 | |||
99 |
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195909 | for (i = 0; i < vlc.table_size; i++) { |
100 | 195620 | int code = vlc.table[i].sym; | |
101 | 195620 | int len = vlc.table[i].len; | |
102 | int level, run; | ||
103 | |||
104 |
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195620 | if (len == 0) { // illegal code |
105 | 6014 | run = 65; | |
106 | 6014 | level = MAX_LEVEL; | |
107 |
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189606 | } else if (len<0) { //more bits needed |
108 | 1862 | run = 0; | |
109 | 1862 | level = code; | |
110 | } else { | ||
111 |
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187744 | if (code == n) { //esc |
112 | 2312 | run = 65; | |
113 | 2312 | level = 0; | |
114 |
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185432 | } else if (code == n + 1) { //eob |
115 | 22592 | run = 0; | |
116 | 22592 | level = 127; | |
117 | } else { | ||
118 | 162840 | run = table_run [code] + 1; | |
119 | 162840 | level = table_level[code]; | |
120 | } | ||
121 | } | ||
122 | 195620 | rl_vlc[i].len = len; | |
123 | 195620 | rl_vlc[i].level = level; | |
124 | 195620 | rl_vlc[i].run = run; | |
125 | } | ||
126 | 289 | } | |
127 | |||
128 | 422654 | void ff_mpeg1_clean_buffers(MpegEncContext *s) | |
129 | { | ||
130 | 422654 | s->last_dc[0] = 1 << (7 + s->intra_dc_precision); | |
131 | 422654 | s->last_dc[1] = s->last_dc[0]; | |
132 | 422654 | s->last_dc[2] = s->last_dc[0]; | |
133 | 422654 | memset(s->last_mv, 0, sizeof(s->last_mv)); | |
134 | 422654 | } | |
135 | |||
136 | |||
137 | /******************************************/ | ||
138 | /* decoding */ | ||
139 | |||
140 | VLCElem ff_mv_vlc[266]; | ||
141 | |||
142 | VLCElem ff_dc_lum_vlc[512]; | ||
143 | VLCElem ff_dc_chroma_vlc[514]; | ||
144 | |||
145 | VLCElem ff_mbincr_vlc[538]; | ||
146 | VLCElem ff_mb_ptype_vlc[64]; | ||
147 | VLCElem ff_mb_btype_vlc[64]; | ||
148 | VLCElem ff_mb_pat_vlc[512]; | ||
149 | |||
150 | RL_VLC_ELEM ff_mpeg1_rl_vlc[680]; | ||
151 | RL_VLC_ELEM ff_mpeg2_rl_vlc[674]; | ||
152 | |||
153 | 139 | static av_cold void mpeg12_init_vlcs(void) | |
154 | { | ||
155 | 139 | VLC_INIT_STATIC_TABLE(ff_dc_lum_vlc, DC_VLC_BITS, 12, | |
156 | ff_mpeg12_vlc_dc_lum_bits, 1, 1, | ||
157 | ff_mpeg12_vlc_dc_lum_code, 2, 2, 0); | ||
158 | 139 | VLC_INIT_STATIC_TABLE(ff_dc_chroma_vlc, DC_VLC_BITS, 12, | |
159 | ff_mpeg12_vlc_dc_chroma_bits, 1, 1, | ||
160 | ff_mpeg12_vlc_dc_chroma_code, 2, 2, 0); | ||
161 | 139 | VLC_INIT_STATIC_TABLE(ff_mv_vlc, MV_VLC_BITS, 17, | |
162 | &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1, | ||
163 | &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 0); | ||
164 | 139 | VLC_INIT_STATIC_TABLE(ff_mbincr_vlc, MBINCR_VLC_BITS, 36, | |
165 | &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1, | ||
166 | &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 0); | ||
167 | 139 | VLC_INIT_STATIC_TABLE(ff_mb_pat_vlc, MB_PAT_VLC_BITS, 64, | |
168 | &ff_mpeg12_mbPatTable[0][1], 2, 1, | ||
169 | &ff_mpeg12_mbPatTable[0][0], 2, 1, 0); | ||
170 | |||
171 | 139 | VLC_INIT_STATIC_SPARSE_TABLE(ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, | |
172 | &table_mb_ptype[0][1], 2, 1, | ||
173 | &table_mb_ptype[0][0], 2, 1, | ||
174 | ptype2mb_type, 2, 2, 0); | ||
175 | 139 | VLC_INIT_STATIC_SPARSE_TABLE(ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, | |
176 | &table_mb_btype[0][1], 2, 1, | ||
177 | &table_mb_btype[0][0], 2, 1, | ||
178 | btype2mb_type, 2, 2, 0); | ||
179 | |||
180 | 139 | ff_init_2d_vlc_rl(ff_mpeg1_vlc_table, ff_mpeg1_rl_vlc, ff_mpeg12_run, | |
181 | ff_mpeg12_level, MPEG12_RL_NB_ELEMS, | ||
182 | FF_ARRAY_ELEMS(ff_mpeg1_rl_vlc), 0); | ||
183 | 139 | ff_init_2d_vlc_rl(ff_mpeg2_vlc_table, ff_mpeg2_rl_vlc, ff_mpeg12_run, | |
184 | ff_mpeg12_level, MPEG12_RL_NB_ELEMS, | ||
185 | FF_ARRAY_ELEMS(ff_mpeg2_rl_vlc), 0); | ||
186 | 139 | } | |
187 | |||
188 | 302 | av_cold void ff_mpeg12_init_vlcs(void) | |
189 | { | ||
190 | static AVOnce init_static_once = AV_ONCE_INIT; | ||
191 | 302 | ff_thread_once(&init_static_once, mpeg12_init_vlcs); | |
192 | 302 | } | |
193 | |||
194 | #define MAX_INDEX (64 - 1) | ||
195 | |||
196 | 176781 | int ff_mpeg1_decode_block_intra(GetBitContext *gb, | |
197 | const uint16_t *quant_matrix, | ||
198 | const uint8_t *scantable, int last_dc[3], | ||
199 | int16_t *block, int index, int qscale) | ||
200 | { | ||
201 | 176781 | int dc, diff, i = 0, component; | |
202 | |||
203 | /* DC coefficient */ | ||
204 | 176781 | component = index <= 3 ? 0 : index - 4 + 1; | |
205 | |||
206 | 176781 | diff = decode_dc(gb, component); | |
207 | |||
208 | 176781 | dc = last_dc[component]; | |
209 | 176781 | dc += diff; | |
210 | 176781 | last_dc[component] = dc; | |
211 | |||
212 | 176781 | block[0] = dc * quant_matrix[0]; | |
213 | |||
214 | { | ||
215 | 176781 | OPEN_READER(re, gb); | |
216 | 176781 | UPDATE_CACHE(re, gb); | |
217 |
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176781 | if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF) |
218 | 36412 | goto end; | |
219 | |||
220 | /* now quantify & encode AC coefficients */ | ||
221 | 1336749 | while (1) { | |
222 | int level, run, j; | ||
223 | |||
224 |
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1477118 | GET_RL_VLC(level, run, re, gb, ff_mpeg1_rl_vlc, |
225 | TEX_VLC_BITS, 2, 0); | ||
226 | |||
227 |
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1477118 | if (level != 0) { |
228 | 1471817 | i += run; | |
229 |
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1471817 | if (i > MAX_INDEX) |
230 | 1 | break; | |
231 | |||
232 | 1471816 | j = scantable[i]; | |
233 | 1471816 | level = (level * qscale * quant_matrix[j]) >> 4; | |
234 | 1471816 | level = (level - 1) | 1; | |
235 | 1471816 | level = (level ^ SHOW_SBITS(re, gb, 1)) - | |
236 | 1471816 | SHOW_SBITS(re, gb, 1); | |
237 | 1471816 | SKIP_BITS(re, gb, 1); | |
238 | } else { | ||
239 | /* escape */ | ||
240 | 5301 | run = SHOW_UBITS(re, gb, 6) + 1; | |
241 | 5301 | LAST_SKIP_BITS(re, gb, 6); | |
242 | 5301 | UPDATE_CACHE(re, gb); | |
243 | 5301 | level = SHOW_SBITS(re, gb, 8); | |
244 | 5301 | SKIP_BITS(re, gb, 8); | |
245 | |||
246 |
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5301 | if (level == -128) { |
247 | ✗ | level = SHOW_UBITS(re, gb, 8) - 256; | |
248 | ✗ | SKIP_BITS(re, gb, 8); | |
249 |
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5301 | } else if (level == 0) { |
250 | ✗ | level = SHOW_UBITS(re, gb, 8); | |
251 | ✗ | SKIP_BITS(re, gb, 8); | |
252 | } | ||
253 | |||
254 | 5301 | i += run; | |
255 |
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5301 | if (i > MAX_INDEX) |
256 | ✗ | break; | |
257 | |||
258 | 5301 | j = scantable[i]; | |
259 |
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5301 | if (level < 0) { |
260 | 2985 | level = -level; | |
261 | 2985 | level = (level * qscale * quant_matrix[j]) >> 4; | |
262 | 2985 | level = (level - 1) | 1; | |
263 | 2985 | level = -level; | |
264 | } else { | ||
265 | 2316 | level = (level * qscale * quant_matrix[j]) >> 4; | |
266 | 2316 | level = (level - 1) | 1; | |
267 | } | ||
268 | } | ||
269 | |||
270 | 1477117 | block[j] = level; | |
271 |
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1477117 | if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF) |
272 | 140368 | break; | |
273 | |||
274 | 1336749 | UPDATE_CACHE(re, gb); | |
275 | } | ||
276 | 176781 | end: | |
277 | 176781 | LAST_SKIP_BITS(re, gb, 2); | |
278 | 176781 | CLOSE_READER(re, gb); | |
279 | } | ||
280 | |||
281 |
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176781 | if (i > MAX_INDEX) |
282 | 1 | i = AVERROR_INVALIDDATA; | |
283 | |||
284 | 176781 | return i; | |
285 | } | ||
286 |