| 1 | /* |
| 2 | * 4XM codec |
| 3 | * Copyright (c) 2003 Michael Niedermayer |
| 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 | * 4XM codec. |
| 25 | */ |
| 26 | |
| 27 | #include <inttypes.h> |
| 28 | |
| 29 | #include "libavutil/avassert.h" |
| 30 | #include "libavutil/frame.h" |
| 31 | #include "libavutil/imgutils.h" |
| 32 | #include "libavutil/intreadwrite.h" |
| 33 | #include "avcodec.h" |
| 34 | #include "blockdsp.h" |
| 35 | #include "bswapdsp.h" |
| 36 | #include "bytestream.h" |
| 37 | #include "get_bits.h" |
| 38 | #include "internal.h" |
| 39 | |
| 40 | |
| 41 | #define BLOCK_TYPE_VLC_BITS 5 |
| 42 | #define ACDC_VLC_BITS 9 |
| 43 | |
| 44 | #define CFRAME_BUFFER_COUNT 100 |
| 45 | |
| 46 | static const uint8_t block_type_tab[2][4][8][2] = { |
| 47 | { |
| 48 | { // { 8, 4, 2 } x { 8, 4, 2} |
| 49 | { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 } |
| 50 | }, { // { 8, 4 } x 1 |
| 51 | { 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } |
| 52 | }, { // 1 x { 8, 4 } |
| 53 | { 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } |
| 54 | }, { // 1 x 2, 2 x 1 |
| 55 | { 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 } |
| 56 | } |
| 57 | }, { |
| 58 | { // { 8, 4, 2 } x { 8, 4, 2} |
| 59 | { 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
| 60 | }, {// { 8, 4 } x 1 |
| 61 | { 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
| 62 | }, {// 1 x { 8, 4 } |
| 63 | { 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
| 64 | }, {// 1 x 2, 2 x 1 |
| 65 | { 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 } |
| 66 | } |
| 67 | } |
| 68 | }; |
| 69 | |
| 70 | static const uint8_t size2index[4][4] = { |
| 71 | { -1, 3, 1, 1 }, |
| 72 | { 3, 0, 0, 0 }, |
| 73 | { 2, 0, 0, 0 }, |
| 74 | { 2, 0, 0, 0 }, |
| 75 | }; |
| 76 | |
| 77 | static const int8_t mv[256][2] = { |
| 78 | { 0, 0 }, { 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 }, |
| 79 | { 1, 1 }, { 0, -2 }, { -2, 0 }, { 2, 0 }, { 0, 2 }, { -1, -2 }, { 1, -2 }, { -2, -1 }, |
| 80 | { 2, -1 }, { -2, 1 }, { 2, 1 }, { -1, 2 }, { 1, 2 }, { -2, -2 }, { 2, -2 }, { -2, 2 }, |
| 81 | { 2, 2 }, { 0, -3 }, { -3, 0 }, { 3, 0 }, { 0, 3 }, { -1, -3 }, { 1, -3 }, { -3, -1 }, |
| 82 | { 3, -1 }, { -3, 1 }, { 3, 1 }, { -1, 3 }, { 1, 3 }, { -2, -3 }, { 2, -3 }, { -3, -2 }, |
| 83 | { 3, -2 }, { -3, 2 }, { 3, 2 }, { -2, 3 }, { 2, 3 }, { 0, -4 }, { -4, 0 }, { 4, 0 }, |
| 84 | { 0, 4 }, { -1, -4 }, { 1, -4 }, { -4, -1 }, { 4, -1 }, { 4, 1 }, { -1, 4 }, { 1, 4 }, |
| 85 | { -3, -3 }, { -3, 3 }, { 3, 3 }, { -2, -4 }, { -4, -2 }, { 4, -2 }, { -4, 2 }, { -2, 4 }, |
| 86 | { 2, 4 }, { -3, -4 }, { 3, -4 }, { 4, -3 }, { -5, 0 }, { -4, 3 }, { -3, 4 }, { 3, 4 }, |
| 87 | { -1, -5 }, { -5, -1 }, { -5, 1 }, { -1, 5 }, { -2, -5 }, { 2, -5 }, { 5, -2 }, { 5, 2 }, |
| 88 | { -4, -4 }, { -4, 4 }, { -3, -5 }, { -5, -3 }, { -5, 3 }, { 3, 5 }, { -6, 0 }, { 0, 6 }, |
| 89 | { -6, -1 }, { -6, 1 }, { 1, 6 }, { 2, -6 }, { -6, 2 }, { 2, 6 }, { -5, -4 }, { 5, 4 }, |
| 90 | { 4, 5 }, { -6, -3 }, { 6, 3 }, { -7, 0 }, { -1, -7 }, { 5, -5 }, { -7, 1 }, { -1, 7 }, |
| 91 | { 4, -6 }, { 6, 4 }, { -2, -7 }, { -7, 2 }, { -3, -7 }, { 7, -3 }, { 3, 7 }, { 6, -5 }, |
| 92 | { 0, -8 }, { -1, -8 }, { -7, -4 }, { -8, 1 }, { 4, 7 }, { 2, -8 }, { -2, 8 }, { 6, 6 }, |
| 93 | { -8, 3 }, { 5, -7 }, { -5, 7 }, { 8, -4 }, { 0, -9 }, { -9, -1 }, { 1, 9 }, { 7, -6 }, |
| 94 | { -7, 6 }, { -5, -8 }, { -5, 8 }, { -9, 3 }, { 9, -4 }, { 7, -7 }, { 8, -6 }, { 6, 8 }, |
| 95 | { 10, 1 }, { -10, 2 }, { 9, -5 }, { 10, -3 }, { -8, -7 }, { -10, -4 }, { 6, -9 }, { -11, 0 }, |
| 96 | { 11, 1 }, { -11, -2 }, { -2, 11 }, { 7, -9 }, { -7, 9 }, { 10, 6 }, { -4, 11 }, { 8, -9 }, |
| 97 | { 8, 9 }, { 5, 11 }, { 7, -10 }, { 12, -3 }, { 11, 6 }, { -9, -9 }, { 8, 10 }, { 5, 12 }, |
| 98 | { -11, 7 }, { 13, 2 }, { 6, -12 }, { 10, 9 }, { -11, 8 }, { -7, 12 }, { 0, 14 }, { 14, -2 }, |
| 99 | { -9, 11 }, { -6, 13 }, { -14, -4 }, { -5, -14 }, { 5, 14 }, { -15, -1 }, { -14, -6 }, { 3, -15 }, |
| 100 | { 11, -11 }, { -7, 14 }, { -5, 15 }, { 8, -14 }, { 15, 6 }, { 3, 16 }, { 7, -15 }, { -16, 5 }, |
| 101 | { 0, 17 }, { -16, -6 }, { -10, 14 }, { -16, 7 }, { 12, 13 }, { -16, 8 }, { -17, 6 }, { -18, 3 }, |
| 102 | { -7, 17 }, { 15, 11 }, { 16, 10 }, { 2, -19 }, { 3, -19 }, { -11, -16 }, { -18, 8 }, { -19, -6 }, |
| 103 | { 2, -20 }, { -17, -11 }, { -10, -18 }, { 8, 19 }, { -21, -1 }, { -20, 7 }, { -4, 21 }, { 21, 5 }, |
| 104 | { 15, 16 }, { 2, -22 }, { -10, -20 }, { -22, 5 }, { 20, -11 }, { -7, -22 }, { -12, 20 }, { 23, -5 }, |
| 105 | { 13, -20 }, { 24, -2 }, { -15, 19 }, { -11, 22 }, { 16, 19 }, { 23, -10 }, { -18, -18 }, { -9, -24 }, |
| 106 | { 24, -10 }, { -3, 26 }, { -23, 13 }, { -18, -20 }, { 17, 21 }, { -4, 27 }, { 27, 6 }, { 1, -28 }, |
| 107 | { -11, 26 }, { -17, -23 }, { 7, 28 }, { 11, -27 }, { 29, 5 }, { -23, -19 }, { -28, -11 }, { -21, 22 }, |
| 108 | { -30, 7 }, { -17, 26 }, { -27, 16 }, { 13, 29 }, { 19, -26 }, { 10, -31 }, { -14, -30 }, { 20, -27 }, |
| 109 | { -29, 18 }, { -16, -31 }, { -28, -22 }, { 21, -30 }, { -25, 28 }, { 26, -29 }, { 25, -32 }, { -32, -32 } |
| 110 | }; |
| 111 | |
| 112 | /* This is simply the scaled down elementwise product of the standard JPEG |
| 113 | * quantizer table and the AAN premul table. */ |
| 114 | static const uint8_t dequant_table[64] = { |
| 115 | 16, 15, 13, 19, 24, 31, 28, 17, |
| 116 | 17, 23, 25, 31, 36, 63, 45, 21, |
| 117 | 18, 24, 27, 37, 52, 59, 49, 20, |
| 118 | 16, 28, 34, 40, 60, 80, 51, 20, |
| 119 | 18, 31, 48, 66, 68, 86, 56, 21, |
| 120 | 19, 38, 56, 59, 64, 64, 48, 20, |
| 121 | 27, 48, 55, 55, 56, 51, 35, 15, |
| 122 | 20, 35, 34, 32, 31, 22, 15, 8, |
| 123 | }; |
| 124 | |
| 125 | static VLC block_type_vlc[2][4]; |
| 126 | |
| 127 | |
| 128 | typedef struct CFrameBuffer { |
| 129 | unsigned int allocated_size; |
| 130 | unsigned int size; |
| 131 | int id; |
| 132 | uint8_t *data; |
| 133 | } CFrameBuffer; |
| 134 | |
| 135 | typedef struct FourXContext { |
| 136 | AVCodecContext *avctx; |
| 137 | BlockDSPContext bdsp; |
| 138 | BswapDSPContext bbdsp; |
| 139 | uint16_t *frame_buffer; |
| 140 | uint16_t *last_frame_buffer; |
| 141 | GetBitContext pre_gb; ///< ac/dc prefix |
| 142 | GetBitContext gb; |
| 143 | GetByteContext g; |
| 144 | GetByteContext g2; |
| 145 | int mv[256]; |
| 146 | VLC pre_vlc; |
| 147 | int last_dc; |
| 148 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
| 149 | void *bitstream_buffer; |
| 150 | unsigned int bitstream_buffer_size; |
| 151 | int version; |
| 152 | CFrameBuffer cfrm[CFRAME_BUFFER_COUNT]; |
| 153 | } FourXContext; |
| 154 | |
| 155 | |
| 156 | #define FIX_1_082392200 70936 |
| 157 | #define FIX_1_414213562 92682 |
| 158 | #define FIX_1_847759065 121095 |
| 159 | #define FIX_2_613125930 171254 |
| 160 | |
| 161 | #define MULTIPLY(var, const) (((var) * (const)) >> 16) |
| 162 | |
| 163 | static void idct(int16_t block[64]) |
| 164 | { |
| 165 | int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
| 166 | int tmp10, tmp11, tmp12, tmp13; |
| 167 | int z5, z10, z11, z12, z13; |
| 168 | int i; |
| 169 | int temp[64]; |
| 170 | |
| 171 | for (i = 0; i < 8; i++) { |
| 172 | tmp10 = block[8 * 0 + i] + block[8 * 4 + i]; |
| 173 | tmp11 = block[8 * 0 + i] - block[8 * 4 + i]; |
| 174 | |
| 175 | tmp13 = block[8 * 2 + i] + block[8 * 6 + i]; |
| 176 | tmp12 = MULTIPLY(block[8 * 2 + i] - block[8 * 6 + i], FIX_1_414213562) - tmp13; |
| 177 | |
| 178 | tmp0 = tmp10 + tmp13; |
| 179 | tmp3 = tmp10 - tmp13; |
| 180 | tmp1 = tmp11 + tmp12; |
| 181 | tmp2 = tmp11 - tmp12; |
| 182 | |
| 183 | z13 = block[8 * 5 + i] + block[8 * 3 + i]; |
| 184 | z10 = block[8 * 5 + i] - block[8 * 3 + i]; |
| 185 | z11 = block[8 * 1 + i] + block[8 * 7 + i]; |
| 186 | z12 = block[8 * 1 + i] - block[8 * 7 + i]; |
| 187 | |
| 188 | tmp7 = z11 + z13; |
| 189 | tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
| 190 | |
| 191 | z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
| 192 | tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
| 193 | tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; |
| 194 | |
| 195 | tmp6 = tmp12 - tmp7; |
| 196 | tmp5 = tmp11 - tmp6; |
| 197 | tmp4 = tmp10 + tmp5; |
| 198 | |
| 199 | temp[8 * 0 + i] = tmp0 + tmp7; |
| 200 | temp[8 * 7 + i] = tmp0 - tmp7; |
| 201 | temp[8 * 1 + i] = tmp1 + tmp6; |
| 202 | temp[8 * 6 + i] = tmp1 - tmp6; |
| 203 | temp[8 * 2 + i] = tmp2 + tmp5; |
| 204 | temp[8 * 5 + i] = tmp2 - tmp5; |
| 205 | temp[8 * 4 + i] = tmp3 + tmp4; |
| 206 | temp[8 * 3 + i] = tmp3 - tmp4; |
| 207 | } |
| 208 | |
| 209 | for (i = 0; i < 8 * 8; i += 8) { |
| 210 | tmp10 = temp[0 + i] + temp[4 + i]; |
| 211 | tmp11 = temp[0 + i] - temp[4 + i]; |
| 212 | |
| 213 | tmp13 = temp[2 + i] + temp[6 + i]; |
| 214 | tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13; |
| 215 | |
| 216 | tmp0 = tmp10 + tmp13; |
| 217 | tmp3 = tmp10 - tmp13; |
| 218 | tmp1 = tmp11 + tmp12; |
| 219 | tmp2 = tmp11 - tmp12; |
| 220 | |
| 221 | z13 = temp[5 + i] + temp[3 + i]; |
| 222 | z10 = temp[5 + i] - temp[3 + i]; |
| 223 | z11 = temp[1 + i] + temp[7 + i]; |
| 224 | z12 = temp[1 + i] - temp[7 + i]; |
| 225 | |
| 226 | tmp7 = z11 + z13; |
| 227 | tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
| 228 | |
| 229 | z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
| 230 | tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
| 231 | tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; |
| 232 | |
| 233 | tmp6 = tmp12 - tmp7; |
| 234 | tmp5 = tmp11 - tmp6; |
| 235 | tmp4 = tmp10 + tmp5; |
| 236 | |
| 237 | block[0 + i] = (tmp0 + tmp7) >> 6; |
| 238 | block[7 + i] = (tmp0 - tmp7) >> 6; |
| 239 | block[1 + i] = (tmp1 + tmp6) >> 6; |
| 240 | block[6 + i] = (tmp1 - tmp6) >> 6; |
| 241 | block[2 + i] = (tmp2 + tmp5) >> 6; |
| 242 | block[5 + i] = (tmp2 - tmp5) >> 6; |
| 243 | block[4 + i] = (tmp3 + tmp4) >> 6; |
| 244 | block[3 + i] = (tmp3 - tmp4) >> 6; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static av_cold void init_vlcs(FourXContext *f) |
| 249 | { |
| 250 | static VLC_TYPE table[2][4][32][2]; |
| 251 | int i, j; |
| 252 | |
| 253 | for (i = 0; i < 2; i++) { |
| 254 | for (j = 0; j < 4; j++) { |
| 255 | block_type_vlc[i][j].table = table[i][j]; |
| 256 | block_type_vlc[i][j].table_allocated = 32; |
| 257 | init_vlc(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7, |
| 258 | &block_type_tab[i][j][0][1], 2, 1, |
| 259 | &block_type_tab[i][j][0][0], 2, 1, |
| 260 | INIT_VLC_USE_NEW_STATIC); |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | static void init_mv(FourXContext *f, int linesize) |
| 266 | { |
| 267 | int i; |
| 268 | |
| 269 | for (i = 0; i < 256; i++) { |
| 270 | if (f->version > 1) |
| 271 | f->mv[i] = mv[i][0] + mv[i][1] * linesize / 2; |
| 272 | else |
| 273 | f->mv[i] = (i & 15) - 8 + ((i >> 4) - 8) * linesize / 2; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | #if HAVE_BIGENDIAN |
| 278 | #define LE_CENTRIC_MUL(dst, src, scale, dc) \ |
| 279 | { \ |
| 280 | unsigned tmpval = AV_RN32(src); \ |
| 281 | tmpval = (tmpval << 16) | (tmpval >> 16); \ |
| 282 | tmpval = tmpval * (scale) + (dc); \ |
| 283 | tmpval = (tmpval << 16) | (tmpval >> 16); \ |
| 284 | AV_WN32A(dst, tmpval); \ |
| 285 | } |
| 286 | #else |
| 287 | #define LE_CENTRIC_MUL(dst, src, scale, dc) \ |
| 288 | { \ |
| 289 | unsigned tmpval = AV_RN32(src) * (scale) + (dc); \ |
| 290 | AV_WN32A(dst, tmpval); \ |
| 291 | } |
| 292 | #endif |
| 293 | |
| 294 | static inline void mcdc(uint16_t *dst, const uint16_t *src, int log2w, |
| 295 | int h, int stride, int scale, unsigned dc) |
| 296 | { |
| 297 | int i; |
| 298 | dc *= 0x10001; |
| 299 | |
| 300 | switch (log2w) { |
| 301 | case 0: |
| 302 | for (i = 0; i < h; i++) { |
| 303 | dst[0] = scale * src[0] + dc; |
| 304 | if (scale) |
| 305 | src += stride; |
| 306 | dst += stride; |
| 307 | } |
| 308 | break; |
| 309 | case 1: |
| 310 | for (i = 0; i < h; i++) { |
| 311 | LE_CENTRIC_MUL(dst, src, scale, dc); |
| 312 | if (scale) |
| 313 | src += stride; |
| 314 | dst += stride; |
| 315 | } |
| 316 | break; |
| 317 | case 2: |
| 318 | for (i = 0; i < h; i++) { |
| 319 | LE_CENTRIC_MUL(dst, src, scale, dc); |
| 320 | LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); |
| 321 | if (scale) |
| 322 | src += stride; |
| 323 | dst += stride; |
| 324 | } |
| 325 | break; |
| 326 | case 3: |
| 327 | for (i = 0; i < h; i++) { |
| 328 | LE_CENTRIC_MUL(dst, src, scale, dc); |
| 329 | LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); |
| 330 | LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc); |
| 331 | LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc); |
| 332 | if (scale) |
| 333 | src += stride; |
| 334 | dst += stride; |
| 335 | } |
| 336 | break; |
| 337 | default: |
| 338 | av_assert0(0); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | static int decode_p_block(FourXContext *f, uint16_t *dst, const uint16_t *src, |
| 343 | int log2w, int log2h, int stride) |
| 344 | { |
| 345 | int index, h, code, ret, scale = 1; |
| 346 | uint16_t *start, *end; |
| 347 | unsigned dc = 0; |
| 348 | |
| 349 | av_assert0(log2w >= 0 && log2h >= 0); |
| 350 | |
| 351 | index = size2index[log2h][log2w]; |
| 352 | av_assert0(index >= 0); |
| 353 | |
| 354 | h = 1 << log2h; |
| 355 | code = get_vlc2(&f->gb, block_type_vlc[1 - (f->version > 1)][index].table, |
| 356 | BLOCK_TYPE_VLC_BITS, 1); |
| 357 | av_assert0(code >= 0 && code <= 6); |
| 358 | |
| 359 | start = f->last_frame_buffer; |
| 360 | end = start + stride * (f->avctx->height - h + 1) - (1 << log2w); |
| 361 | |
| 362 | if (code == 1) { |
| 363 | log2h--; |
| 364 | if ((ret = decode_p_block(f, dst, src, log2w, log2h, stride)) < 0) |
| 365 | return ret; |
| 366 | return decode_p_block(f, dst + (stride << log2h), |
| 367 | src + (stride << log2h), |
| 368 | log2w, log2h, stride); |
| 369 | } else if (code == 2) { |
| 370 | log2w--; |
| 371 | if ((ret = decode_p_block(f, dst , src, log2w, log2h, stride)) < 0) |
| 372 | return ret; |
| 373 | return decode_p_block(f, dst + (1 << log2w), |
| 374 | src + (1 << log2w), |
| 375 | log2w, log2h, stride); |
| 376 | } else if (code == 6) { |
| 377 | if (bytestream2_get_bytes_left(&f->g2) < 4) { |
| 378 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
| 379 | return AVERROR_INVALIDDATA; |
| 380 | } |
| 381 | if (log2w) { |
| 382 | dst[0] = bytestream2_get_le16u(&f->g2); |
| 383 | dst[1] = bytestream2_get_le16u(&f->g2); |
| 384 | } else { |
| 385 | dst[0] = bytestream2_get_le16u(&f->g2); |
| 386 | dst[stride] = bytestream2_get_le16u(&f->g2); |
| 387 | } |
| 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | if ((code&3)==0 && bytestream2_get_bytes_left(&f->g) < 1) { |
| 392 | av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n"); |
| 393 | return AVERROR_INVALIDDATA; |
| 394 | } |
| 395 | |
| 396 | if (code == 0) { |
| 397 | src += f->mv[bytestream2_get_byte(&f->g)]; |
| 398 | } else if (code == 3 && f->version >= 2) { |
| 399 | return 0; |
| 400 | } else if (code == 4) { |
| 401 | src += f->mv[bytestream2_get_byte(&f->g)]; |
| 402 | if (bytestream2_get_bytes_left(&f->g2) < 2){ |
| 403 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
| 404 | return AVERROR_INVALIDDATA; |
| 405 | } |
| 406 | dc = bytestream2_get_le16(&f->g2); |
| 407 | } else if (code == 5) { |
| 408 | if (bytestream2_get_bytes_left(&f->g2) < 2){ |
| 409 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
| 410 | return AVERROR_INVALIDDATA; |
| 411 | } |
| 412 | av_assert0(start <= src && src <= end); |
| 413 | scale = 0; |
| 414 | dc = bytestream2_get_le16(&f->g2); |
| 415 | } |
| 416 | |
| 417 | if (start > src || src > end) { |
| 418 | av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); |
| 419 | return AVERROR_INVALIDDATA; |
| 420 | } |
| 421 | |
| 422 | mcdc(dst, src, log2w, h, stride, scale, dc); |
| 423 | |
| 424 | return 0; |
| 425 | } |
| 426 | |
| 427 | static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length) |
| 428 | { |
| 429 | int x, y; |
| 430 | const int width = f->avctx->width; |
| 431 | const int height = f->avctx->height; |
| 432 | uint16_t *dst = f->frame_buffer; |
| 433 | uint16_t *src; |
| 434 | unsigned int bitstream_size, bytestream_size, wordstream_size, extra, |
| 435 | bytestream_offset, wordstream_offset; |
| 436 | int ret; |
| 437 | |
| 438 | src = f->last_frame_buffer; |
| 439 | |
| 440 | if (f->version > 1) { |
| 441 | extra = 20; |
| 442 | if (length < extra) |
| 443 | return AVERROR_INVALIDDATA; |
| 444 | bitstream_size = AV_RL32(buf + 8); |
| 445 | wordstream_size = AV_RL32(buf + 12); |
| 446 | bytestream_size = AV_RL32(buf + 16); |
| 447 | } else { |
| 448 | extra = 0; |
| 449 | bitstream_size = AV_RL16(buf - 4); |
| 450 | wordstream_size = AV_RL16(buf - 2); |
| 451 | bytestream_size = FFMAX(length - bitstream_size - wordstream_size, 0); |
| 452 | } |
| 453 | |
| 454 | if (bitstream_size > length || bitstream_size >= INT_MAX/8 || |
| 455 | bytestream_size > length - bitstream_size || |
| 456 | wordstream_size > length - bytestream_size - bitstream_size || |
| 457 | extra > length - bytestream_size - bitstream_size - wordstream_size) { |
| 458 | av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size, |
| 459 | bitstream_size+ bytestream_size+ wordstream_size - length); |
| 460 | return AVERROR_INVALIDDATA; |
| 461 | } |
| 462 | |
| 463 | av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, |
| 464 | bitstream_size); |
| 465 | if (!f->bitstream_buffer) |
| 466 | return AVERROR(ENOMEM); |
| 467 | f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) (buf + extra), |
| 468 | bitstream_size / 4); |
| 469 | init_get_bits(&f->gb, f->bitstream_buffer, 8 * bitstream_size); |
| 470 | |
| 471 | wordstream_offset = extra + bitstream_size; |
| 472 | bytestream_offset = extra + bitstream_size + wordstream_size; |
| 473 | bytestream2_init(&f->g2, buf + wordstream_offset, |
| 474 | length - wordstream_offset); |
| 475 | bytestream2_init(&f->g, buf + bytestream_offset, |
| 476 | length - bytestream_offset); |
| 477 | |
| 478 | init_mv(f, width * 2); |
| 479 | |
| 480 | for (y = 0; y < height; y += 8) { |
| 481 | for (x = 0; x < width; x += 8) |
| 482 | if ((ret = decode_p_block(f, dst + x, src + x, 3, 3, width)) < 0) |
| 483 | return ret; |
| 484 | src += 8 * width; |
| 485 | dst += 8 * width; |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | * decode block and dequantize. |
| 493 | * Note this is almost identical to MJPEG. |
| 494 | */ |
| 495 | static int decode_i_block(FourXContext *f, int16_t *block) |
| 496 | { |
| 497 | int code, i, j, level, val; |
| 498 | |
| 499 | if (get_bits_left(&f->gb) < 2){ |
| 500 | av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb)); |
| 501 | return -1; |
| 502 | } |
| 503 | |
| 504 | /* DC coef */ |
| 505 | val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); |
| 506 | if (val >> 4) { |
| 507 | av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n"); |
| 508 | return AVERROR_INVALIDDATA; |
| 509 | } |
| 510 | |
| 511 | if (val) |
| 512 | val = get_xbits(&f->gb, val); |
| 513 | |
| 514 | val = val * dequant_table[0] + f->last_dc; |
| 515 | f->last_dc = block[0] = val; |
| 516 | /* AC coefs */ |
| 517 | i = 1; |
| 518 | for (;;) { |
| 519 | code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); |
| 520 | |
| 521 | /* EOB */ |
| 522 | if (code == 0) |
| 523 | break; |
| 524 | if (code == 0xf0) { |
| 525 | i += 16; |
| 526 | } else { |
| 527 | if (code & 0xf) { |
| 528 | level = get_xbits(&f->gb, code & 0xf); |
| 529 | } else { |
| 530 | av_log(f->avctx, AV_LOG_ERROR, "0 coeff\n"); |
| 531 | return AVERROR_INVALIDDATA; |
| 532 | } |
| 533 | i += code >> 4; |
| 534 | if (i >= 64) { |
| 535 | av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i); |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | j = ff_zigzag_direct[i]; |
| 540 | block[j] = level * dequant_table[j]; |
| 541 | i++; |
| 542 | if (i >= 64) |
| 543 | break; |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | static inline void idct_put(FourXContext *f, int x, int y) |
| 551 | { |
| 552 | int16_t (*block)[64] = f->block; |
| 553 | int stride = f->avctx->width; |
| 554 | int i; |
| 555 | uint16_t *dst = f->frame_buffer + y * stride + x; |
| 556 | |
| 557 | for (i = 0; i < 4; i++) { |
| 558 | block[i][0] += 0x80 * 8 * 8; |
| 559 | idct(block[i]); |
| 560 | } |
| 561 | |
| 562 | if (!(f->avctx->flags & CODEC_FLAG_GRAY)) { |
| 563 | for (i = 4; i < 6; i++) |
| 564 | idct(block[i]); |
| 565 | } |
| 566 | |
| 567 | /* Note transform is: |
| 568 | * y = ( 1b + 4g + 2r) / 14 |
| 569 | * cb = ( 3b - 2g - 1r) / 14 |
| 570 | * cr = (-1b - 4g + 5r) / 14 */ |
| 571 | for (y = 0; y < 8; y++) { |
| 572 | for (x = 0; x < 8; x++) { |
| 573 | int16_t *temp = block[(x >> 2) + 2 * (y >> 2)] + |
| 574 | 2 * (x & 3) + 2 * 8 * (y & 3); // FIXME optimize |
| 575 | int cb = block[4][x + 8 * y]; |
| 576 | int cr = block[5][x + 8 * y]; |
| 577 | int cg = (cb + cr) >> 1; |
| 578 | int y; |
| 579 | |
| 580 | cb += cb; |
| 581 | |
| 582 | y = temp[0]; |
| 583 | dst[0] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
| 584 | y = temp[1]; |
| 585 | dst[1] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
| 586 | y = temp[8]; |
| 587 | dst[stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
| 588 | y = temp[9]; |
| 589 | dst[1 + stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); |
| 590 | dst += 2; |
| 591 | } |
| 592 | dst += 2 * stride - 2 * 8; |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | static int decode_i_mb(FourXContext *f) |
| 597 | { |
| 598 | int ret; |
| 599 | int i; |
| 600 | |
| 601 | f->bdsp.clear_blocks(f->block[0]); |
| 602 | |
| 603 | for (i = 0; i < 6; i++) |
| 604 | if ((ret = decode_i_block(f, f->block[i])) < 0) |
| 605 | return ret; |
| 606 | |
| 607 | return 0; |
| 608 | } |
| 609 | |
| 610 | static const uint8_t *read_huffman_tables(FourXContext *f, |
| 611 | const uint8_t * const buf, |
| 612 | int buf_size) |
| 613 | { |
| 614 | int frequency[512] = { 0 }; |
| 615 | uint8_t flag[512]; |
| 616 | int up[512]; |
| 617 | uint8_t len_tab[257]; |
| 618 | int bits_tab[257]; |
| 619 | int start, end; |
| 620 | const uint8_t *ptr = buf; |
| 621 | const uint8_t *ptr_end = buf + buf_size; |
| 622 | int j; |
| 623 | |
| 624 | memset(up, -1, sizeof(up)); |
| 625 | |
| 626 | start = *ptr++; |
| 627 | end = *ptr++; |
| 628 | for (;;) { |
| 629 | int i; |
| 630 | |
| 631 | if (ptr_end - ptr < FFMAX(end - start + 1, 0) + 1) { |
| 632 | av_log(f->avctx, AV_LOG_ERROR, "invalid data in read_huffman_tables\n"); |
| 633 | return NULL; |
| 634 | } |
| 635 | |
| 636 | for (i = start; i <= end; i++) |
| 637 | frequency[i] = *ptr++; |
| 638 | start = *ptr++; |
| 639 | if (start == 0) |
| 640 | break; |
| 641 | |
| 642 | end = *ptr++; |
| 643 | } |
| 644 | frequency[256] = 1; |
| 645 | |
| 646 | while ((ptr - buf) & 3) |
| 647 | ptr++; // 4byte align |
| 648 | |
| 649 | if (ptr > ptr_end) { |
| 650 | av_log(f->avctx, AV_LOG_ERROR, "ptr overflow in read_huffman_tables\n"); |
| 651 | return NULL; |
| 652 | } |
| 653 | |
| 654 | for (j = 257; j < 512; j++) { |
| 655 | int min_freq[2] = { 256 * 256, 256 * 256 }; |
| 656 | int smallest[2] = { 0, 0 }; |
| 657 | int i; |
| 658 | for (i = 0; i < j; i++) { |
| 659 | if (frequency[i] == 0) |
| 660 | continue; |
| 661 | if (frequency[i] < min_freq[1]) { |
| 662 | if (frequency[i] < min_freq[0]) { |
| 663 | min_freq[1] = min_freq[0]; |
| 664 | smallest[1] = smallest[0]; |
| 665 | min_freq[0] = frequency[i]; |
| 666 | smallest[0] = i; |
| 667 | } else { |
| 668 | min_freq[1] = frequency[i]; |
| 669 | smallest[1] = i; |
| 670 | } |
| 671 | } |
| 672 | } |
| 673 | if (min_freq[1] == 256 * 256) |
| 674 | break; |
| 675 | |
| 676 | frequency[j] = min_freq[0] + min_freq[1]; |
| 677 | flag[smallest[0]] = 0; |
| 678 | flag[smallest[1]] = 1; |
| 679 | up[smallest[0]] = |
| 680 | up[smallest[1]] = j; |
| 681 | frequency[smallest[0]] = frequency[smallest[1]] = 0; |
| 682 | } |
| 683 | |
| 684 | for (j = 0; j < 257; j++) { |
| 685 | int node, len = 0, bits = 0; |
| 686 | |
| 687 | for (node = j; up[node] != -1; node = up[node]) { |
| 688 | bits += flag[node] << len; |
| 689 | len++; |
| 690 | if (len > 31) |
| 691 | // can this happen at all ? |
| 692 | av_log(f->avctx, AV_LOG_ERROR, |
| 693 | "vlc length overflow\n"); |
| 694 | } |
| 695 | |
| 696 | bits_tab[j] = bits; |
| 697 | len_tab[j] = len; |
| 698 | } |
| 699 | |
| 700 | if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1, |
| 701 | bits_tab, 4, 4, 0)) |
| 702 | return NULL; |
| 703 | |
| 704 | return ptr; |
| 705 | } |
| 706 | |
| 707 | static int mix(int c0, int c1) |
| 708 | { |
| 709 | int blue = 2 * (c0 & 0x001F) + (c1 & 0x001F); |
| 710 | int green = (2 * (c0 & 0x03E0) + (c1 & 0x03E0)) >> 5; |
| 711 | int red = 2 * (c0 >> 10) + (c1 >> 10); |
| 712 | return red / 3 * 1024 + green / 3 * 32 + blue / 3; |
| 713 | } |
| 714 | |
| 715 | static int decode_i2_frame(FourXContext *f, const uint8_t *buf, int length) |
| 716 | { |
| 717 | int x, y, x2, y2; |
| 718 | const int width = f->avctx->width; |
| 719 | const int height = f->avctx->height; |
| 720 | const int mbs = (FFALIGN(width, 16) >> 4) * (FFALIGN(height, 16) >> 4); |
| 721 | uint16_t *dst = f->frame_buffer; |
| 722 | const uint8_t *buf_end = buf + length; |
| 723 | GetByteContext g3; |
| 724 | |
| 725 | if (length < mbs * 8) { |
| 726 | av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); |
| 727 | return AVERROR_INVALIDDATA; |
| 728 | } |
| 729 | bytestream2_init(&g3, buf, length); |
| 730 | |
| 731 | for (y = 0; y < height; y += 16) { |
| 732 | for (x = 0; x < width; x += 16) { |
| 733 | unsigned int color[4] = { 0 }, bits; |
| 734 | if (buf_end - buf < 8) |
| 735 | return -1; |
| 736 | // warning following is purely guessed ... |
| 737 | color[0] = bytestream2_get_le16u(&g3); |
| 738 | color[1] = bytestream2_get_le16u(&g3); |
| 739 | |
| 740 | if (color[0] & 0x8000) |
| 741 | av_log(f->avctx, AV_LOG_ERROR, "unk bit 1\n"); |
| 742 | if (color[1] & 0x8000) |
| 743 | av_log(f->avctx, AV_LOG_ERROR, "unk bit 2\n"); |
| 744 | |
| 745 | color[2] = mix(color[0], color[1]); |
| 746 | color[3] = mix(color[1], color[0]); |
| 747 | |
| 748 | bits = bytestream2_get_le32u(&g3); |
| 749 | for (y2 = 0; y2 < 16; y2++) { |
| 750 | for (x2 = 0; x2 < 16; x2++) { |
| 751 | int index = 2 * (x2 >> 2) + 8 * (y2 >> 2); |
| 752 | dst[y2 * width + x2] = color[(bits >> index) & 3]; |
| 753 | } |
| 754 | } |
| 755 | dst += 16; |
| 756 | } |
| 757 | dst += 16 * width - x; |
| 758 | } |
| 759 | |
| 760 | return 0; |
| 761 | } |
| 762 | |
| 763 | static int decode_i_frame(FourXContext *f, const uint8_t *buf, int length) |
| 764 | { |
| 765 | int x, y, ret; |
| 766 | const int width = f->avctx->width; |
| 767 | const int height = f->avctx->height; |
| 768 | const unsigned int bitstream_size = AV_RL32(buf); |
| 769 | unsigned int prestream_size; |
| 770 | const uint8_t *prestream; |
| 771 | |
| 772 | if (bitstream_size > (1 << 26)) |
| 773 | return AVERROR_INVALIDDATA; |
| 774 | |
| 775 | if (length < bitstream_size + 12) { |
| 776 | av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); |
| 777 | return AVERROR_INVALIDDATA; |
| 778 | } |
| 779 | |
| 780 | prestream_size = 4 * AV_RL32(buf + bitstream_size + 4); |
| 781 | prestream = buf + bitstream_size + 12; |
| 782 | |
| 783 | if (prestream_size + bitstream_size + 12 != length |
| 784 | || prestream_size > (1 << 26)) { |
| 785 | av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n", |
| 786 | prestream_size, bitstream_size, length); |
| 787 | return AVERROR_INVALIDDATA; |
| 788 | } |
| 789 | |
| 790 | prestream = read_huffman_tables(f, prestream, prestream_size); |
| 791 | if (!prestream) { |
| 792 | av_log(f->avctx, AV_LOG_ERROR, "Error reading Huffman tables.\n"); |
| 793 | return AVERROR_INVALIDDATA; |
| 794 | } |
| 795 | |
| 796 | av_assert0(prestream <= buf + length); |
| 797 | |
| 798 | init_get_bits(&f->gb, buf + 4, 8 * bitstream_size); |
| 799 | |
| 800 | prestream_size = length + buf - prestream; |
| 801 | |
| 802 | av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, |
| 803 | prestream_size); |
| 804 | if (!f->bitstream_buffer) |
| 805 | return AVERROR(ENOMEM); |
| 806 | f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) prestream, |
| 807 | prestream_size / 4); |
| 808 | init_get_bits(&f->pre_gb, f->bitstream_buffer, 8 * prestream_size); |
| 809 | |
| 810 | f->last_dc = 0 * 128 * 8 * 8; |
| 811 | |
| 812 | for (y = 0; y < height; y += 16) { |
| 813 | for (x = 0; x < width; x += 16) { |
| 814 | if ((ret = decode_i_mb(f)) < 0) |
| 815 | return ret; |
| 816 | |
| 817 | idct_put(f, x, y); |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | if (get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3) != 256) |
| 822 | av_log(f->avctx, AV_LOG_ERROR, "end mismatch\n"); |
| 823 | |
| 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | static int decode_frame(AVCodecContext *avctx, void *data, |
| 828 | int *got_frame, AVPacket *avpkt) |
| 829 | { |
| 830 | const uint8_t *buf = avpkt->data; |
| 831 | int buf_size = avpkt->size; |
| 832 | FourXContext *const f = avctx->priv_data; |
| 833 | AVFrame *picture = data; |
| 834 | int i, frame_4cc, frame_size, ret; |
| 835 | |
| 836 | if (buf_size < 20) |
| 837 | return AVERROR_INVALIDDATA; |
| 838 | |
| 839 | av_assert0(avctx->width % 16 == 0 && avctx->height % 16 == 0); |
| 840 | |
| 841 | if (buf_size < AV_RL32(buf + 4) + 8) { |
| 842 | av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %"PRIu32"\n", |
| 843 | buf_size, AV_RL32(buf + 4)); |
| 844 | return AVERROR_INVALIDDATA; |
| 845 | } |
| 846 | |
| 847 | frame_4cc = AV_RL32(buf); |
| 848 | |
| 849 | if (frame_4cc == AV_RL32("cfrm")) { |
| 850 | int free_index = -1; |
| 851 | int id, whole_size; |
| 852 | const int data_size = buf_size - 20; |
| 853 | CFrameBuffer *cfrm; |
| 854 | |
| 855 | if (f->version <= 1) { |
| 856 | av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version); |
| 857 | return AVERROR_INVALIDDATA; |
| 858 | } |
| 859 | |
| 860 | id = AV_RL32(buf + 12); |
| 861 | whole_size = AV_RL32(buf + 16); |
| 862 | |
| 863 | if (data_size < 0 || whole_size < 0) { |
| 864 | av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n"); |
| 865 | return AVERROR_INVALIDDATA; |
| 866 | } |
| 867 | |
| 868 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) |
| 869 | if (f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number) |
| 870 | av_log(f->avctx, AV_LOG_ERROR, "lost c frame %d\n", |
| 871 | f->cfrm[i].id); |
| 872 | |
| 873 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { |
| 874 | if (f->cfrm[i].id == id) |
| 875 | break; |
| 876 | if (f->cfrm[i].size == 0) |
| 877 | free_index = i; |
| 878 | } |
| 879 | |
| 880 | if (i >= CFRAME_BUFFER_COUNT) { |
| 881 | i = free_index; |
| 882 | f->cfrm[i].id = id; |
| 883 | } |
| 884 | cfrm = &f->cfrm[i]; |
| 885 | |
| 886 | if (data_size > UINT_MAX - cfrm->size - FF_INPUT_BUFFER_PADDING_SIZE) |
| 887 | return AVERROR_INVALIDDATA; |
| 888 | |
| 889 | cfrm->data = av_fast_realloc(cfrm->data, &cfrm->allocated_size, |
| 890 | cfrm->size + data_size + FF_INPUT_BUFFER_PADDING_SIZE); |
| 891 | // explicit check needed as memcpy below might not catch a NULL |
| 892 | if (!cfrm->data) { |
| 893 | av_log(f->avctx, AV_LOG_ERROR, "realloc failure\n"); |
| 894 | return AVERROR(ENOMEM); |
| 895 | } |
| 896 | |
| 897 | memcpy(cfrm->data + cfrm->size, buf + 20, data_size); |
| 898 | cfrm->size += data_size; |
| 899 | |
| 900 | if (cfrm->size >= whole_size) { |
| 901 | buf = cfrm->data; |
| 902 | frame_size = cfrm->size; |
| 903 | |
| 904 | if (id != avctx->frame_number) |
| 905 | av_log(f->avctx, AV_LOG_ERROR, "cframe id mismatch %d %d\n", |
| 906 | id, avctx->frame_number); |
| 907 | |
| 908 | if (f->version <= 1) |
| 909 | return AVERROR_INVALIDDATA; |
| 910 | |
| 911 | cfrm->size = cfrm->id = 0; |
| 912 | frame_4cc = AV_RL32("pfrm"); |
| 913 | } else |
| 914 | return buf_size; |
| 915 | } else { |
| 916 | buf = buf + 12; |
| 917 | frame_size = buf_size - 12; |
| 918 | } |
| 919 | |
| 920 | if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) |
| 921 | return ret; |
| 922 | |
| 923 | if (frame_4cc == AV_RL32("ifr2")) { |
| 924 | picture->pict_type = AV_PICTURE_TYPE_I; |
| 925 | if ((ret = decode_i2_frame(f, buf - 4, frame_size + 4)) < 0) { |
| 926 | av_log(f->avctx, AV_LOG_ERROR, "decode i2 frame failed\n"); |
| 927 | return ret; |
| 928 | } |
| 929 | } else if (frame_4cc == AV_RL32("ifrm")) { |
| 930 | picture->pict_type = AV_PICTURE_TYPE_I; |
| 931 | if ((ret = decode_i_frame(f, buf, frame_size)) < 0) { |
| 932 | av_log(f->avctx, AV_LOG_ERROR, "decode i frame failed\n"); |
| 933 | return ret; |
| 934 | } |
| 935 | } else if (frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")) { |
| 936 | picture->pict_type = AV_PICTURE_TYPE_P; |
| 937 | if ((ret = decode_p_frame(f, buf, frame_size)) < 0) { |
| 938 | av_log(f->avctx, AV_LOG_ERROR, "decode p frame failed\n"); |
| 939 | return ret; |
| 940 | } |
| 941 | } else if (frame_4cc == AV_RL32("snd_")) { |
| 942 | av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n", |
| 943 | buf_size); |
| 944 | } else { |
| 945 | av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n", |
| 946 | buf_size); |
| 947 | } |
| 948 | |
| 949 | picture->key_frame = picture->pict_type == AV_PICTURE_TYPE_I; |
| 950 | |
| 951 | av_image_copy_plane(picture->data[0], picture->linesize[0], |
| 952 | (const uint8_t*)f->frame_buffer, avctx->width * 2, |
| 953 | avctx->width * 2, avctx->height); |
| 954 | FFSWAP(uint16_t *, f->frame_buffer, f->last_frame_buffer); |
| 955 | |
| 956 | *got_frame = 1; |
| 957 | |
| 958 | emms_c(); |
| 959 | |
| 960 | return buf_size; |
| 961 | } |
| 962 | |
| 963 | static av_cold int decode_end(AVCodecContext *avctx) |
| 964 | { |
| 965 | FourXContext * const f = avctx->priv_data; |
| 966 | int i; |
| 967 | |
| 968 | av_freep(&f->frame_buffer); |
| 969 | av_freep(&f->last_frame_buffer); |
| 970 | av_freep(&f->bitstream_buffer); |
| 971 | f->bitstream_buffer_size = 0; |
| 972 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { |
| 973 | av_freep(&f->cfrm[i].data); |
| 974 | f->cfrm[i].allocated_size = 0; |
| 975 | } |
| 976 | ff_free_vlc(&f->pre_vlc); |
| 977 | |
| 978 | return 0; |
| 979 | } |
| 980 | |
| 981 | static av_cold int decode_init(AVCodecContext *avctx) |
| 982 | { |
| 983 | FourXContext * const f = avctx->priv_data; |
| 984 | int ret; |
| 985 | |
| 986 | if (avctx->extradata_size != 4 || !avctx->extradata) { |
| 987 | av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n"); |
| 988 | return AVERROR_INVALIDDATA; |
| 989 | } |
| 990 | if((avctx->width % 16) || (avctx->height % 16)) { |
| 991 | av_log(avctx, AV_LOG_ERROR, "unsupported width/height\n"); |
| 992 | return AVERROR_INVALIDDATA; |
| 993 | } |
| 994 | |
| 995 | ret = av_image_check_size(avctx->width, avctx->height, 0, avctx); |
| 996 | if (ret < 0) |
| 997 | return ret; |
| 998 | |
| 999 | f->frame_buffer = av_mallocz(avctx->width * avctx->height * 2); |
| 1000 | f->last_frame_buffer = av_mallocz(avctx->width * avctx->height * 2); |
| 1001 | if (!f->frame_buffer || !f->last_frame_buffer) { |
| 1002 | decode_end(avctx); |
| 1003 | return AVERROR(ENOMEM); |
| 1004 | } |
| 1005 | |
| 1006 | f->version = AV_RL32(avctx->extradata) >> 16; |
| 1007 | ff_blockdsp_init(&f->bdsp, avctx); |
| 1008 | ff_bswapdsp_init(&f->bbdsp); |
| 1009 | f->avctx = avctx; |
| 1010 | init_vlcs(f); |
| 1011 | |
| 1012 | if (f->version > 2) |
| 1013 | avctx->pix_fmt = AV_PIX_FMT_RGB565; |
| 1014 | else |
| 1015 | avctx->pix_fmt = AV_PIX_FMT_BGR555; |
| 1016 | |
| 1017 | return 0; |
| 1018 | } |
| 1019 | |
| 1020 | AVCodec ff_fourxm_decoder = { |
| 1021 | .name = "4xm", |
| 1022 | .long_name = NULL_IF_CONFIG_SMALL("4X Movie"), |
| 1023 | .type = AVMEDIA_TYPE_VIDEO, |
| 1024 | .id = AV_CODEC_ID_4XM, |
| 1025 | .priv_data_size = sizeof(FourXContext), |
| 1026 | .init = decode_init, |
| 1027 | .close = decode_end, |
| 1028 | .decode = decode_frame, |
| 1029 | .capabilities = CODEC_CAP_DR1, |
| 1030 | }; |