| Line | Branch | Exec | Source |
|---|---|---|---|
| 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/thread.h" | ||
| 32 | |||
| 33 | #include "mpegvideo.h" | ||
| 34 | #include "mpeg12codecs.h" | ||
| 35 | #include "mpeg12data.h" | ||
| 36 | #include "mpeg12dec.h" | ||
| 37 | #include "mpegutils.h" | ||
| 38 | #include "rl.h" | ||
| 39 | |||
| 40 | static const uint8_t table_mb_ptype[7][2] = { | ||
| 41 | { 3, 5 }, // 0x01 MB_INTRA | ||
| 42 | { 1, 2 }, // 0x02 MB_PAT | ||
| 43 | { 1, 3 }, // 0x08 MB_FOR | ||
| 44 | { 1, 1 }, // 0x0A MB_FOR|MB_PAT | ||
| 45 | { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA | ||
| 46 | { 1, 5 }, // 0x12 MB_QUANT|MB_PAT | ||
| 47 | { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT | ||
| 48 | }; | ||
| 49 | |||
| 50 | static const uint8_t table_mb_btype[11][2] = { | ||
| 51 | { 3, 5 }, // 0x01 MB_INTRA | ||
| 52 | { 2, 3 }, // 0x04 MB_BACK | ||
| 53 | { 3, 3 }, // 0x06 MB_BACK|MB_PAT | ||
| 54 | { 2, 4 }, // 0x08 MB_FOR | ||
| 55 | { 3, 4 }, // 0x0A MB_FOR|MB_PAT | ||
| 56 | { 2, 2 }, // 0x0C MB_FOR|MB_BACK | ||
| 57 | { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT | ||
| 58 | { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA | ||
| 59 | { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT | ||
| 60 | { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT | ||
| 61 | { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT | ||
| 62 | }; | ||
| 63 | |||
| 64 | static const int16_t ptype2mb_type[7] = { | ||
| 65 | MB_TYPE_INTRA, | ||
| 66 | MB_TYPE_FORWARD_MV | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, | ||
| 67 | MB_TYPE_FORWARD_MV, | ||
| 68 | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
| 69 | MB_TYPE_QUANT | MB_TYPE_INTRA, | ||
| 70 | MB_TYPE_QUANT | MB_TYPE_FORWARD_MV | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, | ||
| 71 | MB_TYPE_QUANT | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
| 72 | }; | ||
| 73 | |||
| 74 | static const int16_t btype2mb_type[11] = { | ||
| 75 | MB_TYPE_INTRA, | ||
| 76 | MB_TYPE_BACKWARD_MV, | ||
| 77 | MB_TYPE_BACKWARD_MV | MB_TYPE_CBP, | ||
| 78 | MB_TYPE_FORWARD_MV, | ||
| 79 | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
| 80 | MB_TYPE_BIDIR_MV, | ||
| 81 | MB_TYPE_BIDIR_MV | MB_TYPE_CBP, | ||
| 82 | MB_TYPE_QUANT | MB_TYPE_INTRA, | ||
| 83 | MB_TYPE_QUANT | MB_TYPE_BACKWARD_MV | MB_TYPE_CBP, | ||
| 84 | MB_TYPE_QUANT | MB_TYPE_FORWARD_MV | MB_TYPE_CBP, | ||
| 85 | MB_TYPE_QUANT | MB_TYPE_BIDIR_MV | MB_TYPE_CBP, | ||
| 86 | }; | ||
| 87 | |||
| 88 | 289 | av_cold void ff_init_2d_vlc_rl(const uint16_t table_vlc[][2], RL_VLC_ELEM rl_vlc[], | |
| 89 | const int8_t table_run[], const uint8_t table_level[], | ||
| 90 | int n, unsigned static_size, int flags) | ||
| 91 | { | ||
| 92 | 289 | ff_vlc_init_table_sparse(rl_vlc, static_size, TEX_VLC_BITS, n + 2, | |
| 93 | 289 | &table_vlc[0][1], 4, 2, &table_vlc[0][0], 4, 2, | |
| 94 | NULL, 0, 0, flags); | ||
| 95 | |||
| 96 |
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195909 | for (unsigned i = 0; i < static_size; i++) { |
| 97 | 195620 | int idx = rl_vlc[i].sym; | |
| 98 | 195620 | int len = rl_vlc[i].len; | |
| 99 | int level, run; | ||
| 100 | |||
| 101 |
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195620 | if (len == 0) { // illegal code |
| 102 | 6014 | run = 65; | |
| 103 | 6014 | level = MAX_LEVEL; | |
| 104 |
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189606 | } else if (len<0) { //more bits needed |
| 105 | 1862 | run = 0; | |
| 106 | 1862 | level = idx; | |
| 107 | } else { | ||
| 108 |
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187744 | if (idx == n) { //esc |
| 109 | 2312 | run = 65; | |
| 110 | 2312 | level = 0; | |
| 111 |
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185432 | } else if (idx == n + 1) { //eob |
| 112 | 22592 | run = 0; | |
| 113 | 22592 | level = 127; | |
| 114 | } else { | ||
| 115 | 162840 | run = table_run [idx] + 1; | |
| 116 | 162840 | level = table_level[idx]; | |
| 117 | } | ||
| 118 | } | ||
| 119 | 195620 | rl_vlc[i].len8 = len; | |
| 120 | 195620 | rl_vlc[i].level = level; | |
| 121 | 195620 | rl_vlc[i].run = run; | |
| 122 | } | ||
| 123 | 289 | } | |
| 124 | |||
| 125 | 422718 | void ff_mpeg1_clean_buffers(MpegEncContext *s) | |
| 126 | { | ||
| 127 | 422718 | s->last_dc[0] = 1 << (7 + s->intra_dc_precision); | |
| 128 | 422718 | s->last_dc[1] = s->last_dc[0]; | |
| 129 | 422718 | s->last_dc[2] = s->last_dc[0]; | |
| 130 | 422718 | memset(s->last_mv, 0, sizeof(s->last_mv)); | |
| 131 | 422718 | } | |
| 132 | |||
| 133 | |||
| 134 | /******************************************/ | ||
| 135 | /* decoding */ | ||
| 136 | |||
| 137 | VLCElem ff_mv_vlc[266]; | ||
| 138 | |||
| 139 | VLCElem ff_dc_lum_vlc[512]; | ||
| 140 | VLCElem ff_dc_chroma_vlc[514]; | ||
| 141 | |||
| 142 | VLCElem ff_mbincr_vlc[538]; | ||
| 143 | VLCElem ff_mb_ptype_vlc[64]; | ||
| 144 | VLCElem ff_mb_btype_vlc[64]; | ||
| 145 | VLCElem ff_mb_pat_vlc[512]; | ||
| 146 | |||
| 147 | RL_VLC_ELEM ff_mpeg1_rl_vlc[680]; | ||
| 148 | RL_VLC_ELEM ff_mpeg2_rl_vlc[674]; | ||
| 149 | |||
| 150 | 139 | static av_cold void mpeg12_init_vlcs(void) | |
| 151 | { | ||
| 152 | 139 | VLC_INIT_STATIC_TABLE(ff_dc_lum_vlc, DC_VLC_BITS, 12, | |
| 153 | ff_mpeg12_vlc_dc_lum_bits, 1, 1, | ||
| 154 | ff_mpeg12_vlc_dc_lum_code, 2, 2, 0); | ||
| 155 | 139 | VLC_INIT_STATIC_TABLE(ff_dc_chroma_vlc, DC_VLC_BITS, 12, | |
| 156 | ff_mpeg12_vlc_dc_chroma_bits, 1, 1, | ||
| 157 | ff_mpeg12_vlc_dc_chroma_code, 2, 2, 0); | ||
| 158 | 139 | VLC_INIT_STATIC_TABLE(ff_mv_vlc, MV_VLC_BITS, 17, | |
| 159 | &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1, | ||
| 160 | &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 0); | ||
| 161 | 139 | VLC_INIT_STATIC_TABLE(ff_mbincr_vlc, MBINCR_VLC_BITS, 36, | |
| 162 | &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1, | ||
| 163 | &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 0); | ||
| 164 | 139 | VLC_INIT_STATIC_TABLE(ff_mb_pat_vlc, MB_PAT_VLC_BITS, 64, | |
| 165 | &ff_mpeg12_mbPatTable[0][1], 2, 1, | ||
| 166 | &ff_mpeg12_mbPatTable[0][0], 2, 1, 0); | ||
| 167 | |||
| 168 | 139 | VLC_INIT_STATIC_SPARSE_TABLE(ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, | |
| 169 | &table_mb_ptype[0][1], 2, 1, | ||
| 170 | &table_mb_ptype[0][0], 2, 1, | ||
| 171 | ptype2mb_type, 2, 2, 0); | ||
| 172 | 139 | VLC_INIT_STATIC_SPARSE_TABLE(ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, | |
| 173 | &table_mb_btype[0][1], 2, 1, | ||
| 174 | &table_mb_btype[0][0], 2, 1, | ||
| 175 | btype2mb_type, 2, 2, 0); | ||
| 176 | |||
| 177 | 139 | ff_init_2d_vlc_rl(ff_mpeg1_vlc_table, ff_mpeg1_rl_vlc, ff_mpeg12_run, | |
| 178 | ff_mpeg12_level, MPEG12_RL_NB_ELEMS, | ||
| 179 | FF_ARRAY_ELEMS(ff_mpeg1_rl_vlc), 0); | ||
| 180 | 139 | ff_init_2d_vlc_rl(ff_mpeg2_vlc_table, ff_mpeg2_rl_vlc, ff_mpeg12_run, | |
| 181 | ff_mpeg12_level, MPEG12_RL_NB_ELEMS, | ||
| 182 | FF_ARRAY_ELEMS(ff_mpeg2_rl_vlc), 0); | ||
| 183 | 139 | } | |
| 184 | |||
| 185 | 302 | av_cold void ff_mpeg12_init_vlcs(void) | |
| 186 | { | ||
| 187 | static AVOnce init_static_once = AV_ONCE_INIT; | ||
| 188 | 302 | ff_thread_once(&init_static_once, mpeg12_init_vlcs); | |
| 189 | 302 | } | |
| 190 | |||
| 191 | #define MAX_INDEX (64 - 1) | ||
| 192 | |||
| 193 | 176781 | int ff_mpeg1_decode_block_intra(GetBitContext *gb, | |
| 194 | const uint16_t *quant_matrix, | ||
| 195 | const uint8_t *scantable, int last_dc[3], | ||
| 196 | int16_t *block, int index, int qscale) | ||
| 197 | { | ||
| 198 | 176781 | int dc, diff, i = 0, component; | |
| 199 | |||
| 200 | /* DC coefficient */ | ||
| 201 | 176781 | component = index <= 3 ? 0 : index - 4 + 1; | |
| 202 | |||
| 203 | 176781 | diff = decode_dc(gb, component); | |
| 204 | |||
| 205 | 176781 | dc = last_dc[component]; | |
| 206 | 176781 | dc += diff; | |
| 207 | 176781 | last_dc[component] = dc; | |
| 208 | |||
| 209 | 176781 | block[0] = dc * quant_matrix[0]; | |
| 210 | |||
| 211 | { | ||
| 212 | 176781 | OPEN_READER(re, gb); | |
| 213 | 176781 | UPDATE_CACHE(re, gb); | |
| 214 |
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176781 | if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF) |
| 215 | 36412 | goto end; | |
| 216 | |||
| 217 | /* now quantify & encode AC coefficients */ | ||
| 218 | 1336749 | while (1) { | |
| 219 | int level, run, j; | ||
| 220 | |||
| 221 |
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1477118 | GET_RL_VLC(level, run, re, gb, ff_mpeg1_rl_vlc, |
| 222 | TEX_VLC_BITS, 2, 0); | ||
| 223 | |||
| 224 |
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1477118 | if (level != 0) { |
| 225 | 1471817 | i += run; | |
| 226 |
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1471817 | if (i > MAX_INDEX) |
| 227 | 1 | break; | |
| 228 | |||
| 229 | 1471816 | j = scantable[i]; | |
| 230 | 1471816 | level = (level * qscale * quant_matrix[j]) >> 4; | |
| 231 | 1471816 | level = (level - 1) | 1; | |
| 232 | 1471816 | level = (level ^ SHOW_SBITS(re, gb, 1)) - | |
| 233 | 1471816 | SHOW_SBITS(re, gb, 1); | |
| 234 | 1471816 | SKIP_BITS(re, gb, 1); | |
| 235 | } else { | ||
| 236 | /* escape */ | ||
| 237 | 5301 | run = SHOW_UBITS(re, gb, 6) + 1; | |
| 238 | 5301 | LAST_SKIP_BITS(re, gb, 6); | |
| 239 | 5301 | UPDATE_CACHE(re, gb); | |
| 240 | 5301 | level = SHOW_SBITS(re, gb, 8); | |
| 241 | 5301 | SKIP_BITS(re, gb, 8); | |
| 242 | |||
| 243 |
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5301 | if (level == -128) { |
| 244 | ✗ | level = SHOW_UBITS(re, gb, 8) - 256; | |
| 245 | ✗ | SKIP_BITS(re, gb, 8); | |
| 246 |
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5301 | } else if (level == 0) { |
| 247 | ✗ | level = SHOW_UBITS(re, gb, 8); | |
| 248 | ✗ | SKIP_BITS(re, gb, 8); | |
| 249 | } | ||
| 250 | |||
| 251 | 5301 | i += run; | |
| 252 |
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5301 | if (i > MAX_INDEX) |
| 253 | ✗ | break; | |
| 254 | |||
| 255 | 5301 | j = scantable[i]; | |
| 256 |
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5301 | if (level < 0) { |
| 257 | 2985 | level = -level; | |
| 258 | 2985 | level = (level * qscale * quant_matrix[j]) >> 4; | |
| 259 | 2985 | level = (level - 1) | 1; | |
| 260 | 2985 | level = -level; | |
| 261 | } else { | ||
| 262 | 2316 | level = (level * qscale * quant_matrix[j]) >> 4; | |
| 263 | 2316 | level = (level - 1) | 1; | |
| 264 | } | ||
| 265 | } | ||
| 266 | |||
| 267 | 1477117 | block[j] = level; | |
| 268 |
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1477117 | if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF) |
| 269 | 140368 | break; | |
| 270 | |||
| 271 | 1336749 | UPDATE_CACHE(re, gb); | |
| 272 | } | ||
| 273 | 176781 | end: | |
| 274 | 176781 | LAST_SKIP_BITS(re, gb, 2); | |
| 275 | 176781 | CLOSE_READER(re, gb); | |
| 276 | } | ||
| 277 | |||
| 278 |
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176781 | if (i > MAX_INDEX) |
| 279 | 1 | i = AVERROR_INVALIDDATA; | |
| 280 | |||
| 281 | 176781 | return i; | |
| 282 | } | ||
| 283 |