| 1 | /* |
| 2 | * Indeo Video v3 compatible decoder |
| 3 | * Copyright (c) 2009 - 2011 Maxim Poliakovski |
| 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 | * This is a decoder for Intel Indeo Video v3. |
| 25 | * It is based on vector quantization, run-length coding and motion compensation. |
| 26 | * Known container formats: .avi and .mov |
| 27 | * Known FOURCCs: 'IV31', 'IV32' |
| 28 | * |
| 29 | * @see http://wiki.multimedia.cx/index.php?title=Indeo_3 |
| 30 | */ |
| 31 | |
| 32 | #include "libavutil/imgutils.h" |
| 33 | #include "libavutil/intreadwrite.h" |
| 34 | #include "avcodec.h" |
| 35 | #include "copy_block.h" |
| 36 | #include "bytestream.h" |
| 37 | #include "get_bits.h" |
| 38 | #include "hpeldsp.h" |
| 39 | #include "internal.h" |
| 40 | |
| 41 | #include "indeo3data.h" |
| 42 | |
| 43 | /* RLE opcodes. */ |
| 44 | enum { |
| 45 | RLE_ESC_F9 = 249, ///< same as RLE_ESC_FA + do the same with next block |
| 46 | RLE_ESC_FA = 250, ///< INTRA: skip block, INTER: copy data from reference |
| 47 | RLE_ESC_FB = 251, ///< apply null delta to N blocks / skip N blocks |
| 48 | RLE_ESC_FC = 252, ///< same as RLE_ESC_FD + do the same with next block |
| 49 | RLE_ESC_FD = 253, ///< apply null delta to all remaining lines of this block |
| 50 | RLE_ESC_FE = 254, ///< apply null delta to all lines up to the 3rd line |
| 51 | RLE_ESC_FF = 255 ///< apply null delta to all lines up to the 2nd line |
| 52 | }; |
| 53 | |
| 54 | |
| 55 | /* Some constants for parsing frame bitstream flags. */ |
| 56 | #define BS_8BIT_PEL (1 << 1) ///< 8bit pixel bitdepth indicator |
| 57 | #define BS_KEYFRAME (1 << 2) ///< intra frame indicator |
| 58 | #define BS_MV_Y_HALF (1 << 4) ///< vertical mv halfpel resolution indicator |
| 59 | #define BS_MV_X_HALF (1 << 5) ///< horizontal mv halfpel resolution indicator |
| 60 | #define BS_NONREF (1 << 8) ///< nonref (discardable) frame indicator |
| 61 | #define BS_BUFFER 9 ///< indicates which of two frame buffers should be used |
| 62 | |
| 63 | |
| 64 | typedef struct Plane { |
| 65 | uint8_t *buffers[2]; |
| 66 | uint8_t *pixels[2]; ///< pointer to the actual pixel data of the buffers above |
| 67 | uint32_t width; |
| 68 | uint32_t height; |
| 69 | uint32_t pitch; |
| 70 | } Plane; |
| 71 | |
| 72 | #define CELL_STACK_MAX 20 |
| 73 | |
| 74 | typedef struct Cell { |
| 75 | int16_t xpos; ///< cell coordinates in 4x4 blocks |
| 76 | int16_t ypos; |
| 77 | int16_t width; ///< cell width in 4x4 blocks |
| 78 | int16_t height; ///< cell height in 4x4 blocks |
| 79 | uint8_t tree; ///< tree id: 0- MC tree, 1 - VQ tree |
| 80 | const int8_t *mv_ptr; ///< ptr to the motion vector if any |
| 81 | } Cell; |
| 82 | |
| 83 | typedef struct Indeo3DecodeContext { |
| 84 | AVCodecContext *avctx; |
| 85 | HpelDSPContext hdsp; |
| 86 | |
| 87 | GetBitContext gb; |
| 88 | int need_resync; |
| 89 | int skip_bits; |
| 90 | const uint8_t *next_cell_data; |
| 91 | const uint8_t *last_byte; |
| 92 | const int8_t *mc_vectors; |
| 93 | unsigned num_vectors; ///< number of motion vectors in mc_vectors |
| 94 | |
| 95 | int16_t width, height; |
| 96 | uint32_t frame_num; ///< current frame number (zero-based) |
| 97 | int data_size; ///< size of the frame data in bytes |
| 98 | uint16_t frame_flags; ///< frame properties |
| 99 | uint8_t cb_offset; ///< needed for selecting VQ tables |
| 100 | uint8_t buf_sel; ///< active frame buffer: 0 - primary, 1 -secondary |
| 101 | const uint8_t *y_data_ptr; |
| 102 | const uint8_t *v_data_ptr; |
| 103 | const uint8_t *u_data_ptr; |
| 104 | int32_t y_data_size; |
| 105 | int32_t v_data_size; |
| 106 | int32_t u_data_size; |
| 107 | const uint8_t *alt_quant; ///< secondary VQ table set for the modes 1 and 4 |
| 108 | Plane planes[3]; |
| 109 | } Indeo3DecodeContext; |
| 110 | |
| 111 | |
| 112 | static uint8_t requant_tab[8][128]; |
| 113 | |
| 114 | /* |
| 115 | * Build the static requantization table. |
| 116 | * This table is used to remap pixel values according to a specific |
| 117 | * quant index and thus avoid overflows while adding deltas. |
| 118 | */ |
| 119 | static av_cold void build_requant_tab(void) |
| 120 | { |
| 121 | static const int8_t offsets[8] = { 1, 1, 2, -3, -3, 3, 4, 4 }; |
| 122 | static const int8_t deltas [8] = { 0, 1, 0, 4, 4, 1, 0, 1 }; |
| 123 | |
| 124 | int i, j, step; |
| 125 | |
| 126 | for (i = 0; i < 8; i++) { |
| 127 | step = i + 2; |
| 128 | for (j = 0; j < 128; j++) |
| 129 | requant_tab[i][j] = (j + offsets[i]) / step * step + deltas[i]; |
| 130 | } |
| 131 | |
| 132 | /* some last elements calculated above will have values >= 128 */ |
| 133 | /* pixel values shall never exceed 127 so set them to non-overflowing values */ |
| 134 | /* according with the quantization step of the respective section */ |
| 135 | requant_tab[0][127] = 126; |
| 136 | requant_tab[1][119] = 118; |
| 137 | requant_tab[1][120] = 118; |
| 138 | requant_tab[2][126] = 124; |
| 139 | requant_tab[2][127] = 124; |
| 140 | requant_tab[6][124] = 120; |
| 141 | requant_tab[6][125] = 120; |
| 142 | requant_tab[6][126] = 120; |
| 143 | requant_tab[6][127] = 120; |
| 144 | |
| 145 | /* Patch for compatibility with the Intel's binary decoders */ |
| 146 | requant_tab[1][7] = 10; |
| 147 | requant_tab[4][8] = 10; |
| 148 | } |
| 149 | |
| 150 | |
| 151 | static av_cold void free_frame_buffers(Indeo3DecodeContext *ctx) |
| 152 | { |
| 153 | int p; |
| 154 | |
| 155 | ctx->width = ctx->height = 0; |
| 156 | |
| 157 | for (p = 0; p < 3; p++) { |
| 158 | av_freep(&ctx->planes[p].buffers[0]); |
| 159 | av_freep(&ctx->planes[p].buffers[1]); |
| 160 | ctx->planes[p].pixels[0] = ctx->planes[p].pixels[1] = 0; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | |
| 165 | static av_cold int allocate_frame_buffers(Indeo3DecodeContext *ctx, |
| 166 | AVCodecContext *avctx, int luma_width, int luma_height) |
| 167 | { |
| 168 | int p, chroma_width, chroma_height; |
| 169 | int luma_pitch, chroma_pitch, luma_size, chroma_size; |
| 170 | |
| 171 | if (luma_width < 16 || luma_width > 640 || |
| 172 | luma_height < 16 || luma_height > 480 || |
| 173 | luma_width & 3 || luma_height & 3) { |
| 174 | av_log(avctx, AV_LOG_ERROR, "Invalid picture dimensions: %d x %d!\n", |
| 175 | luma_width, luma_height); |
| 176 | return AVERROR_INVALIDDATA; |
| 177 | } |
| 178 | |
| 179 | ctx->width = luma_width ; |
| 180 | ctx->height = luma_height; |
| 181 | |
| 182 | chroma_width = FFALIGN(luma_width >> 2, 4); |
| 183 | chroma_height = FFALIGN(luma_height >> 2, 4); |
| 184 | |
| 185 | luma_pitch = FFALIGN(luma_width, 16); |
| 186 | chroma_pitch = FFALIGN(chroma_width, 16); |
| 187 | |
| 188 | /* Calculate size of the luminance plane. */ |
| 189 | /* Add one line more for INTRA prediction. */ |
| 190 | luma_size = luma_pitch * (luma_height + 1); |
| 191 | |
| 192 | /* Calculate size of a chrominance planes. */ |
| 193 | /* Add one line more for INTRA prediction. */ |
| 194 | chroma_size = chroma_pitch * (chroma_height + 1); |
| 195 | |
| 196 | /* allocate frame buffers */ |
| 197 | for (p = 0; p < 3; p++) { |
| 198 | ctx->planes[p].pitch = !p ? luma_pitch : chroma_pitch; |
| 199 | ctx->planes[p].width = !p ? luma_width : chroma_width; |
| 200 | ctx->planes[p].height = !p ? luma_height : chroma_height; |
| 201 | |
| 202 | ctx->planes[p].buffers[0] = av_malloc(!p ? luma_size : chroma_size); |
| 203 | ctx->planes[p].buffers[1] = av_malloc(!p ? luma_size : chroma_size); |
| 204 | |
| 205 | if (!ctx->planes[p].buffers[0] || !ctx->planes[p].buffers[1]) { |
| 206 | free_frame_buffers(ctx); |
| 207 | return AVERROR(ENOMEM); |
| 208 | } |
| 209 | |
| 210 | /* fill the INTRA prediction lines with the middle pixel value = 64 */ |
| 211 | memset(ctx->planes[p].buffers[0], 0x40, ctx->planes[p].pitch); |
| 212 | memset(ctx->planes[p].buffers[1], 0x40, ctx->planes[p].pitch); |
| 213 | |
| 214 | /* set buffer pointers = buf_ptr + pitch and thus skip the INTRA prediction line */ |
| 215 | ctx->planes[p].pixels[0] = ctx->planes[p].buffers[0] + ctx->planes[p].pitch; |
| 216 | ctx->planes[p].pixels[1] = ctx->planes[p].buffers[1] + ctx->planes[p].pitch; |
| 217 | memset(ctx->planes[p].pixels[0], 0, ctx->planes[p].pitch * ctx->planes[p].height); |
| 218 | memset(ctx->planes[p].pixels[1], 0, ctx->planes[p].pitch * ctx->planes[p].height); |
| 219 | } |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * Copy pixels of the cell(x + mv_x, y + mv_y) from the previous frame into |
| 226 | * the cell(x, y) in the current frame. |
| 227 | * |
| 228 | * @param ctx pointer to the decoder context |
| 229 | * @param plane pointer to the plane descriptor |
| 230 | * @param cell pointer to the cell descriptor |
| 231 | */ |
| 232 | static int copy_cell(Indeo3DecodeContext *ctx, Plane *plane, Cell *cell) |
| 233 | { |
| 234 | int h, w, mv_x, mv_y, offset, offset_dst; |
| 235 | uint8_t *src, *dst; |
| 236 | |
| 237 | /* setup output and reference pointers */ |
| 238 | offset_dst = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2); |
| 239 | dst = plane->pixels[ctx->buf_sel] + offset_dst; |
| 240 | if(cell->mv_ptr){ |
| 241 | mv_y = cell->mv_ptr[0]; |
| 242 | mv_x = cell->mv_ptr[1]; |
| 243 | }else |
| 244 | mv_x= mv_y= 0; |
| 245 | |
| 246 | /* -1 because there is an extra line on top for prediction */ |
| 247 | if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 || |
| 248 | ((cell->ypos + cell->height) << 2) + mv_y > plane->height || |
| 249 | ((cell->xpos + cell->width) << 2) + mv_x > plane->width) { |
| 250 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 251 | "Motion vectors point out of the frame.\n"); |
| 252 | return AVERROR_INVALIDDATA; |
| 253 | } |
| 254 | |
| 255 | offset = offset_dst + mv_y * plane->pitch + mv_x; |
| 256 | src = plane->pixels[ctx->buf_sel ^ 1] + offset; |
| 257 | |
| 258 | h = cell->height << 2; |
| 259 | |
| 260 | for (w = cell->width; w > 0;) { |
| 261 | /* copy using 16xH blocks */ |
| 262 | if (!((cell->xpos << 2) & 15) && w >= 4) { |
| 263 | for (; w >= 4; src += 16, dst += 16, w -= 4) |
| 264 | ctx->hdsp.put_pixels_tab[0][0](dst, src, plane->pitch, h); |
| 265 | } |
| 266 | |
| 267 | /* copy using 8xH blocks */ |
| 268 | if (!((cell->xpos << 2) & 7) && w >= 2) { |
| 269 | ctx->hdsp.put_pixels_tab[1][0](dst, src, plane->pitch, h); |
| 270 | w -= 2; |
| 271 | src += 8; |
| 272 | dst += 8; |
| 273 | } else if (w >= 1) { |
| 274 | ctx->hdsp.put_pixels_tab[2][0](dst, src, plane->pitch, h); |
| 275 | w--; |
| 276 | src += 4; |
| 277 | dst += 4; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | |
| 285 | /* Average 4/8 pixels at once without rounding using SWAR */ |
| 286 | #define AVG_32(dst, src, ref) \ |
| 287 | AV_WN32A(dst, ((AV_RN32(src) + AV_RN32(ref)) >> 1) & 0x7F7F7F7FUL) |
| 288 | |
| 289 | #define AVG_64(dst, src, ref) \ |
| 290 | AV_WN64A(dst, ((AV_RN64(src) + AV_RN64(ref)) >> 1) & 0x7F7F7F7F7F7F7F7FULL) |
| 291 | |
| 292 | |
| 293 | /* |
| 294 | * Replicate each even pixel as follows: |
| 295 | * ABCDEFGH -> AACCEEGG |
| 296 | */ |
| 297 | static inline uint64_t replicate64(uint64_t a) { |
| 298 | #if HAVE_BIGENDIAN |
| 299 | a &= 0xFF00FF00FF00FF00ULL; |
| 300 | a |= a >> 8; |
| 301 | #else |
| 302 | a &= 0x00FF00FF00FF00FFULL; |
| 303 | a |= a << 8; |
| 304 | #endif |
| 305 | return a; |
| 306 | } |
| 307 | |
| 308 | static inline uint32_t replicate32(uint32_t a) { |
| 309 | #if HAVE_BIGENDIAN |
| 310 | a &= 0xFF00FF00UL; |
| 311 | a |= a >> 8; |
| 312 | #else |
| 313 | a &= 0x00FF00FFUL; |
| 314 | a |= a << 8; |
| 315 | #endif |
| 316 | return a; |
| 317 | } |
| 318 | |
| 319 | |
| 320 | /* Fill n lines with 64bit pixel value pix */ |
| 321 | static inline void fill_64(uint8_t *dst, const uint64_t pix, int32_t n, |
| 322 | int32_t row_offset) |
| 323 | { |
| 324 | for (; n > 0; dst += row_offset, n--) |
| 325 | AV_WN64A(dst, pix); |
| 326 | } |
| 327 | |
| 328 | |
| 329 | /* Error codes for cell decoding. */ |
| 330 | enum { |
| 331 | IV3_NOERR = 0, |
| 332 | IV3_BAD_RLE = 1, |
| 333 | IV3_BAD_DATA = 2, |
| 334 | IV3_BAD_COUNTER = 3, |
| 335 | IV3_UNSUPPORTED = 4, |
| 336 | IV3_OUT_OF_DATA = 5 |
| 337 | }; |
| 338 | |
| 339 | |
| 340 | #define BUFFER_PRECHECK \ |
| 341 | if (*data_ptr >= last_ptr) \ |
| 342 | return IV3_OUT_OF_DATA; \ |
| 343 | |
| 344 | #define RLE_BLOCK_COPY \ |
| 345 | if (cell->mv_ptr || !skip_flag) \ |
| 346 | copy_block4(dst, ref, row_offset, row_offset, 4 << v_zoom) |
| 347 | |
| 348 | #define RLE_BLOCK_COPY_8 \ |
| 349 | pix64 = AV_RN64(ref);\ |
| 350 | if (is_first_row) {/* special prediction case: top line of a cell */\ |
| 351 | pix64 = replicate64(pix64);\ |
| 352 | fill_64(dst + row_offset, pix64, 7, row_offset);\ |
| 353 | AVG_64(dst, ref, dst + row_offset);\ |
| 354 | } else \ |
| 355 | fill_64(dst, pix64, 8, row_offset) |
| 356 | |
| 357 | #define RLE_LINES_COPY \ |
| 358 | copy_block4(dst, ref, row_offset, row_offset, num_lines << v_zoom) |
| 359 | |
| 360 | #define RLE_LINES_COPY_M10 \ |
| 361 | pix64 = AV_RN64(ref);\ |
| 362 | if (is_top_of_cell) {\ |
| 363 | pix64 = replicate64(pix64);\ |
| 364 | fill_64(dst + row_offset, pix64, (num_lines << 1) - 1, row_offset);\ |
| 365 | AVG_64(dst, ref, dst + row_offset);\ |
| 366 | } else \ |
| 367 | fill_64(dst, pix64, num_lines << 1, row_offset) |
| 368 | |
| 369 | #define APPLY_DELTA_4 \ |
| 370 | AV_WN16A(dst + line_offset ,\ |
| 371 | (AV_RN16(ref ) + delta_tab->deltas[dyad1]) & 0x7F7F);\ |
| 372 | AV_WN16A(dst + line_offset + 2,\ |
| 373 | (AV_RN16(ref + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\ |
| 374 | if (mode >= 3) {\ |
| 375 | if (is_top_of_cell && !cell->ypos) {\ |
| 376 | AV_COPY32U(dst, dst + row_offset);\ |
| 377 | } else {\ |
| 378 | AVG_32(dst, ref, dst + row_offset);\ |
| 379 | }\ |
| 380 | } |
| 381 | |
| 382 | #define APPLY_DELTA_8 \ |
| 383 | /* apply two 32-bit VQ deltas to next even line */\ |
| 384 | if (is_top_of_cell) { \ |
| 385 | AV_WN32A(dst + row_offset , \ |
| 386 | (replicate32(AV_RN32(ref )) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\ |
| 387 | AV_WN32A(dst + row_offset + 4, \ |
| 388 | (replicate32(AV_RN32(ref + 4)) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\ |
| 389 | } else { \ |
| 390 | AV_WN32A(dst + row_offset , \ |
| 391 | (AV_RN32(ref ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\ |
| 392 | AV_WN32A(dst + row_offset + 4, \ |
| 393 | (AV_RN32(ref + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\ |
| 394 | } \ |
| 395 | /* odd lines are not coded but rather interpolated/replicated */\ |
| 396 | /* first line of the cell on the top of image? - replicate */\ |
| 397 | /* otherwise - interpolate */\ |
| 398 | if (is_top_of_cell && !cell->ypos) {\ |
| 399 | AV_COPY64U(dst, dst + row_offset);\ |
| 400 | } else \ |
| 401 | AVG_64(dst, ref, dst + row_offset); |
| 402 | |
| 403 | |
| 404 | #define APPLY_DELTA_1011_INTER \ |
| 405 | if (mode == 10) { \ |
| 406 | AV_WN32A(dst , \ |
| 407 | (AV_RN32(dst ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\ |
| 408 | AV_WN32A(dst + 4 , \ |
| 409 | (AV_RN32(dst + 4 ) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\ |
| 410 | AV_WN32A(dst + row_offset , \ |
| 411 | (AV_RN32(dst + row_offset ) + delta_tab->deltas_m10[dyad1]) & 0x7F7F7F7F);\ |
| 412 | AV_WN32A(dst + row_offset + 4, \ |
| 413 | (AV_RN32(dst + row_offset + 4) + delta_tab->deltas_m10[dyad2]) & 0x7F7F7F7F);\ |
| 414 | } else { \ |
| 415 | AV_WN16A(dst , \ |
| 416 | (AV_RN16(dst ) + delta_tab->deltas[dyad1]) & 0x7F7F);\ |
| 417 | AV_WN16A(dst + 2 , \ |
| 418 | (AV_RN16(dst + 2 ) + delta_tab->deltas[dyad2]) & 0x7F7F);\ |
| 419 | AV_WN16A(dst + row_offset , \ |
| 420 | (AV_RN16(dst + row_offset ) + delta_tab->deltas[dyad1]) & 0x7F7F);\ |
| 421 | AV_WN16A(dst + row_offset + 2, \ |
| 422 | (AV_RN16(dst + row_offset + 2) + delta_tab->deltas[dyad2]) & 0x7F7F);\ |
| 423 | } |
| 424 | |
| 425 | |
| 426 | static int decode_cell_data(Indeo3DecodeContext *ctx, Cell *cell, |
| 427 | uint8_t *block, uint8_t *ref_block, |
| 428 | int pitch, int h_zoom, int v_zoom, int mode, |
| 429 | const vqEntry *delta[2], int swap_quads[2], |
| 430 | const uint8_t **data_ptr, const uint8_t *last_ptr) |
| 431 | { |
| 432 | int x, y, line, num_lines; |
| 433 | int rle_blocks = 0; |
| 434 | uint8_t code, *dst, *ref; |
| 435 | const vqEntry *delta_tab; |
| 436 | unsigned int dyad1, dyad2; |
| 437 | uint64_t pix64; |
| 438 | int skip_flag = 0, is_top_of_cell, is_first_row = 1; |
| 439 | int row_offset, blk_row_offset, line_offset; |
| 440 | |
| 441 | row_offset = pitch; |
| 442 | blk_row_offset = (row_offset << (2 + v_zoom)) - (cell->width << 2); |
| 443 | line_offset = v_zoom ? row_offset : 0; |
| 444 | |
| 445 | if (cell->height & v_zoom || cell->width & h_zoom) |
| 446 | return IV3_BAD_DATA; |
| 447 | |
| 448 | for (y = 0; y < cell->height; is_first_row = 0, y += 1 + v_zoom) { |
| 449 | for (x = 0; x < cell->width; x += 1 + h_zoom) { |
| 450 | ref = ref_block; |
| 451 | dst = block; |
| 452 | |
| 453 | if (rle_blocks > 0) { |
| 454 | if (mode <= 4) { |
| 455 | RLE_BLOCK_COPY; |
| 456 | } else if (mode == 10 && !cell->mv_ptr) { |
| 457 | RLE_BLOCK_COPY_8; |
| 458 | } |
| 459 | rle_blocks--; |
| 460 | } else { |
| 461 | for (line = 0; line < 4;) { |
| 462 | num_lines = 1; |
| 463 | is_top_of_cell = is_first_row && !line; |
| 464 | |
| 465 | /* select primary VQ table for odd, secondary for even lines */ |
| 466 | if (mode <= 4) |
| 467 | delta_tab = delta[line & 1]; |
| 468 | else |
| 469 | delta_tab = delta[1]; |
| 470 | BUFFER_PRECHECK; |
| 471 | code = bytestream_get_byte(data_ptr); |
| 472 | if (code < 248) { |
| 473 | if (code < delta_tab->num_dyads) { |
| 474 | BUFFER_PRECHECK; |
| 475 | dyad1 = bytestream_get_byte(data_ptr); |
| 476 | dyad2 = code; |
| 477 | if (dyad1 >= delta_tab->num_dyads || dyad1 >= 248) |
| 478 | return IV3_BAD_DATA; |
| 479 | } else { |
| 480 | /* process QUADS */ |
| 481 | code -= delta_tab->num_dyads; |
| 482 | dyad1 = code / delta_tab->quad_exp; |
| 483 | dyad2 = code % delta_tab->quad_exp; |
| 484 | if (swap_quads[line & 1]) |
| 485 | FFSWAP(unsigned int, dyad1, dyad2); |
| 486 | } |
| 487 | if (mode <= 4) { |
| 488 | APPLY_DELTA_4; |
| 489 | } else if (mode == 10 && !cell->mv_ptr) { |
| 490 | APPLY_DELTA_8; |
| 491 | } else { |
| 492 | APPLY_DELTA_1011_INTER; |
| 493 | } |
| 494 | } else { |
| 495 | /* process RLE codes */ |
| 496 | switch (code) { |
| 497 | case RLE_ESC_FC: |
| 498 | skip_flag = 0; |
| 499 | rle_blocks = 1; |
| 500 | code = 253; |
| 501 | /* FALLTHROUGH */ |
| 502 | case RLE_ESC_FF: |
| 503 | case RLE_ESC_FE: |
| 504 | case RLE_ESC_FD: |
| 505 | num_lines = 257 - code - line; |
| 506 | if (num_lines <= 0) |
| 507 | return IV3_BAD_RLE; |
| 508 | if (mode <= 4) { |
| 509 | RLE_LINES_COPY; |
| 510 | } else if (mode == 10 && !cell->mv_ptr) { |
| 511 | RLE_LINES_COPY_M10; |
| 512 | } |
| 513 | break; |
| 514 | case RLE_ESC_FB: |
| 515 | BUFFER_PRECHECK; |
| 516 | code = bytestream_get_byte(data_ptr); |
| 517 | rle_blocks = (code & 0x1F) - 1; /* set block counter */ |
| 518 | if (code >= 64 || rle_blocks < 0) |
| 519 | return IV3_BAD_COUNTER; |
| 520 | skip_flag = code & 0x20; |
| 521 | num_lines = 4 - line; /* enforce next block processing */ |
| 522 | if (mode >= 10 || (cell->mv_ptr || !skip_flag)) { |
| 523 | if (mode <= 4) { |
| 524 | RLE_LINES_COPY; |
| 525 | } else if (mode == 10 && !cell->mv_ptr) { |
| 526 | RLE_LINES_COPY_M10; |
| 527 | } |
| 528 | } |
| 529 | break; |
| 530 | case RLE_ESC_F9: |
| 531 | skip_flag = 1; |
| 532 | rle_blocks = 1; |
| 533 | /* FALLTHROUGH */ |
| 534 | case RLE_ESC_FA: |
| 535 | if (line) |
| 536 | return IV3_BAD_RLE; |
| 537 | num_lines = 4; /* enforce next block processing */ |
| 538 | if (cell->mv_ptr) { |
| 539 | if (mode <= 4) { |
| 540 | RLE_LINES_COPY; |
| 541 | } else if (mode == 10 && !cell->mv_ptr) { |
| 542 | RLE_LINES_COPY_M10; |
| 543 | } |
| 544 | } |
| 545 | break; |
| 546 | default: |
| 547 | return IV3_UNSUPPORTED; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | line += num_lines; |
| 552 | ref += row_offset * (num_lines << v_zoom); |
| 553 | dst += row_offset * (num_lines << v_zoom); |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | /* move to next horizontal block */ |
| 558 | block += 4 << h_zoom; |
| 559 | ref_block += 4 << h_zoom; |
| 560 | } |
| 561 | |
| 562 | /* move to next line of blocks */ |
| 563 | ref_block += blk_row_offset; |
| 564 | block += blk_row_offset; |
| 565 | } |
| 566 | return IV3_NOERR; |
| 567 | } |
| 568 | |
| 569 | |
| 570 | /** |
| 571 | * Decode a vector-quantized cell. |
| 572 | * It consists of several routines, each of which handles one or more "modes" |
| 573 | * with which a cell can be encoded. |
| 574 | * |
| 575 | * @param ctx pointer to the decoder context |
| 576 | * @param avctx ptr to the AVCodecContext |
| 577 | * @param plane pointer to the plane descriptor |
| 578 | * @param cell pointer to the cell descriptor |
| 579 | * @param data_ptr pointer to the compressed data |
| 580 | * @param last_ptr pointer to the last byte to catch reads past end of buffer |
| 581 | * @return number of consumed bytes or negative number in case of error |
| 582 | */ |
| 583 | static int decode_cell(Indeo3DecodeContext *ctx, AVCodecContext *avctx, |
| 584 | Plane *plane, Cell *cell, const uint8_t *data_ptr, |
| 585 | const uint8_t *last_ptr) |
| 586 | { |
| 587 | int x, mv_x, mv_y, mode, vq_index, prim_indx, second_indx; |
| 588 | int zoom_fac; |
| 589 | int offset, error = 0, swap_quads[2]; |
| 590 | uint8_t code, *block, *ref_block = 0; |
| 591 | const vqEntry *delta[2]; |
| 592 | const uint8_t *data_start = data_ptr; |
| 593 | |
| 594 | /* get coding mode and VQ table index from the VQ descriptor byte */ |
| 595 | code = *data_ptr++; |
| 596 | mode = code >> 4; |
| 597 | vq_index = code & 0xF; |
| 598 | |
| 599 | /* setup output and reference pointers */ |
| 600 | offset = (cell->ypos << 2) * plane->pitch + (cell->xpos << 2); |
| 601 | block = plane->pixels[ctx->buf_sel] + offset; |
| 602 | |
| 603 | if (!cell->mv_ptr) { |
| 604 | /* use previous line as reference for INTRA cells */ |
| 605 | ref_block = block - plane->pitch; |
| 606 | } else if (mode >= 10) { |
| 607 | /* for mode 10 and 11 INTER first copy the predicted cell into the current one */ |
| 608 | /* so we don't need to do data copying for each RLE code later */ |
| 609 | int ret = copy_cell(ctx, plane, cell); |
| 610 | if (ret < 0) |
| 611 | return ret; |
| 612 | } else { |
| 613 | /* set the pointer to the reference pixels for modes 0-4 INTER */ |
| 614 | mv_y = cell->mv_ptr[0]; |
| 615 | mv_x = cell->mv_ptr[1]; |
| 616 | |
| 617 | /* -1 because there is an extra line on top for prediction */ |
| 618 | if ((cell->ypos << 2) + mv_y < -1 || (cell->xpos << 2) + mv_x < 0 || |
| 619 | ((cell->ypos + cell->height) << 2) + mv_y > plane->height || |
| 620 | ((cell->xpos + cell->width) << 2) + mv_x > plane->width) { |
| 621 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 622 | "Motion vectors point out of the frame.\n"); |
| 623 | return AVERROR_INVALIDDATA; |
| 624 | } |
| 625 | |
| 626 | offset += mv_y * plane->pitch + mv_x; |
| 627 | ref_block = plane->pixels[ctx->buf_sel ^ 1] + offset; |
| 628 | } |
| 629 | |
| 630 | /* select VQ tables as follows: */ |
| 631 | /* modes 0 and 3 use only the primary table for all lines in a block */ |
| 632 | /* while modes 1 and 4 switch between primary and secondary tables on alternate lines */ |
| 633 | if (mode == 1 || mode == 4) { |
| 634 | code = ctx->alt_quant[vq_index]; |
| 635 | prim_indx = (code >> 4) + ctx->cb_offset; |
| 636 | second_indx = (code & 0xF) + ctx->cb_offset; |
| 637 | } else { |
| 638 | vq_index += ctx->cb_offset; |
| 639 | prim_indx = second_indx = vq_index; |
| 640 | } |
| 641 | |
| 642 | if (prim_indx >= 24 || second_indx >= 24) { |
| 643 | av_log(avctx, AV_LOG_ERROR, "Invalid VQ table indexes! Primary: %d, secondary: %d!\n", |
| 644 | prim_indx, second_indx); |
| 645 | return AVERROR_INVALIDDATA; |
| 646 | } |
| 647 | |
| 648 | delta[0] = &vq_tab[second_indx]; |
| 649 | delta[1] = &vq_tab[prim_indx]; |
| 650 | swap_quads[0] = second_indx >= 16; |
| 651 | swap_quads[1] = prim_indx >= 16; |
| 652 | |
| 653 | /* requantize the prediction if VQ index of this cell differs from VQ index */ |
| 654 | /* of the predicted cell in order to avoid overflows. */ |
| 655 | if (vq_index >= 8 && ref_block) { |
| 656 | for (x = 0; x < cell->width << 2; x++) |
| 657 | ref_block[x] = requant_tab[vq_index & 7][ref_block[x] & 127]; |
| 658 | } |
| 659 | |
| 660 | error = IV3_NOERR; |
| 661 | |
| 662 | switch (mode) { |
| 663 | case 0: /*------------------ MODES 0 & 1 (4x4 block processing) --------------------*/ |
| 664 | case 1: |
| 665 | case 3: /*------------------ MODES 3 & 4 (4x8 block processing) --------------------*/ |
| 666 | case 4: |
| 667 | if (mode >= 3 && cell->mv_ptr) { |
| 668 | av_log(avctx, AV_LOG_ERROR, "Attempt to apply Mode 3/4 to an INTER cell!\n"); |
| 669 | return AVERROR_INVALIDDATA; |
| 670 | } |
| 671 | |
| 672 | zoom_fac = mode >= 3; |
| 673 | error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch, |
| 674 | 0, zoom_fac, mode, delta, swap_quads, |
| 675 | &data_ptr, last_ptr); |
| 676 | break; |
| 677 | case 10: /*-------------------- MODE 10 (8x8 block processing) ---------------------*/ |
| 678 | case 11: /*----------------- MODE 11 (4x8 INTER block processing) ------------------*/ |
| 679 | if (mode == 10 && !cell->mv_ptr) { /* MODE 10 INTRA processing */ |
| 680 | error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch, |
| 681 | 1, 1, mode, delta, swap_quads, |
| 682 | &data_ptr, last_ptr); |
| 683 | } else { /* mode 10 and 11 INTER processing */ |
| 684 | if (mode == 11 && !cell->mv_ptr) { |
| 685 | av_log(avctx, AV_LOG_ERROR, "Attempt to use Mode 11 for an INTRA cell!\n"); |
| 686 | return AVERROR_INVALIDDATA; |
| 687 | } |
| 688 | |
| 689 | zoom_fac = mode == 10; |
| 690 | error = decode_cell_data(ctx, cell, block, ref_block, plane->pitch, |
| 691 | zoom_fac, 1, mode, delta, swap_quads, |
| 692 | &data_ptr, last_ptr); |
| 693 | } |
| 694 | break; |
| 695 | default: |
| 696 | av_log(avctx, AV_LOG_ERROR, "Unsupported coding mode: %d\n", mode); |
| 697 | return AVERROR_INVALIDDATA; |
| 698 | }//switch mode |
| 699 | |
| 700 | switch (error) { |
| 701 | case IV3_BAD_RLE: |
| 702 | av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE code %X is not allowed at the current line\n", |
| 703 | mode, data_ptr[-1]); |
| 704 | return AVERROR_INVALIDDATA; |
| 705 | case IV3_BAD_DATA: |
| 706 | av_log(avctx, AV_LOG_ERROR, "Mode %d: invalid VQ data\n", mode); |
| 707 | return AVERROR_INVALIDDATA; |
| 708 | case IV3_BAD_COUNTER: |
| 709 | av_log(avctx, AV_LOG_ERROR, "Mode %d: RLE-FB invalid counter: %d\n", mode, code); |
| 710 | return AVERROR_INVALIDDATA; |
| 711 | case IV3_UNSUPPORTED: |
| 712 | av_log(avctx, AV_LOG_ERROR, "Mode %d: unsupported RLE code: %X\n", mode, data_ptr[-1]); |
| 713 | return AVERROR_INVALIDDATA; |
| 714 | case IV3_OUT_OF_DATA: |
| 715 | av_log(avctx, AV_LOG_ERROR, "Mode %d: attempt to read past end of buffer\n", mode); |
| 716 | return AVERROR_INVALIDDATA; |
| 717 | } |
| 718 | |
| 719 | return data_ptr - data_start; /* report number of bytes consumed from the input buffer */ |
| 720 | } |
| 721 | |
| 722 | |
| 723 | /* Binary tree codes. */ |
| 724 | enum { |
| 725 | H_SPLIT = 0, |
| 726 | V_SPLIT = 1, |
| 727 | INTRA_NULL = 2, |
| 728 | INTER_DATA = 3 |
| 729 | }; |
| 730 | |
| 731 | |
| 732 | #define SPLIT_CELL(size, new_size) (new_size) = ((size) > 2) ? ((((size) + 2) >> 2) << 1) : 1 |
| 733 | |
| 734 | #define UPDATE_BITPOS(n) \ |
| 735 | ctx->skip_bits += (n); \ |
| 736 | ctx->need_resync = 1 |
| 737 | |
| 738 | #define RESYNC_BITSTREAM \ |
| 739 | if (ctx->need_resync && !(get_bits_count(&ctx->gb) & 7)) { \ |
| 740 | skip_bits_long(&ctx->gb, ctx->skip_bits); \ |
| 741 | ctx->skip_bits = 0; \ |
| 742 | ctx->need_resync = 0; \ |
| 743 | } |
| 744 | |
| 745 | #define CHECK_CELL \ |
| 746 | if (curr_cell.xpos + curr_cell.width > (plane->width >> 2) || \ |
| 747 | curr_cell.ypos + curr_cell.height > (plane->height >> 2)) { \ |
| 748 | av_log(avctx, AV_LOG_ERROR, "Invalid cell: x=%d, y=%d, w=%d, h=%d\n", \ |
| 749 | curr_cell.xpos, curr_cell.ypos, curr_cell.width, curr_cell.height); \ |
| 750 | return AVERROR_INVALIDDATA; \ |
| 751 | } |
| 752 | |
| 753 | |
| 754 | static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx, |
| 755 | Plane *plane, int code, Cell *ref_cell, |
| 756 | const int depth, const int strip_width) |
| 757 | { |
| 758 | Cell curr_cell; |
| 759 | int bytes_used, ret; |
| 760 | |
| 761 | if (depth <= 0) { |
| 762 | av_log(avctx, AV_LOG_ERROR, "Stack overflow (corrupted binary tree)!\n"); |
| 763 | return AVERROR_INVALIDDATA; // unwind recursion |
| 764 | } |
| 765 | |
| 766 | curr_cell = *ref_cell; // clone parent cell |
| 767 | if (code == H_SPLIT) { |
| 768 | SPLIT_CELL(ref_cell->height, curr_cell.height); |
| 769 | ref_cell->ypos += curr_cell.height; |
| 770 | ref_cell->height -= curr_cell.height; |
| 771 | if (ref_cell->height <= 0 || curr_cell.height <= 0) |
| 772 | return AVERROR_INVALIDDATA; |
| 773 | } else if (code == V_SPLIT) { |
| 774 | if (curr_cell.width > strip_width) { |
| 775 | /* split strip */ |
| 776 | curr_cell.width = (curr_cell.width <= (strip_width << 1) ? 1 : 2) * strip_width; |
| 777 | } else |
| 778 | SPLIT_CELL(ref_cell->width, curr_cell.width); |
| 779 | ref_cell->xpos += curr_cell.width; |
| 780 | ref_cell->width -= curr_cell.width; |
| 781 | if (ref_cell->width <= 0 || curr_cell.width <= 0) |
| 782 | return AVERROR_INVALIDDATA; |
| 783 | } |
| 784 | |
| 785 | while (get_bits_left(&ctx->gb) >= 2) { /* loop until return */ |
| 786 | RESYNC_BITSTREAM; |
| 787 | switch (code = get_bits(&ctx->gb, 2)) { |
| 788 | case H_SPLIT: |
| 789 | case V_SPLIT: |
| 790 | if (parse_bintree(ctx, avctx, plane, code, &curr_cell, depth - 1, strip_width)) |
| 791 | return AVERROR_INVALIDDATA; |
| 792 | break; |
| 793 | case INTRA_NULL: |
| 794 | if (!curr_cell.tree) { /* MC tree INTRA code */ |
| 795 | curr_cell.mv_ptr = 0; /* mark the current strip as INTRA */ |
| 796 | curr_cell.tree = 1; /* enter the VQ tree */ |
| 797 | } else { /* VQ tree NULL code */ |
| 798 | RESYNC_BITSTREAM; |
| 799 | code = get_bits(&ctx->gb, 2); |
| 800 | if (code >= 2) { |
| 801 | av_log(avctx, AV_LOG_ERROR, "Invalid VQ_NULL code: %d\n", code); |
| 802 | return AVERROR_INVALIDDATA; |
| 803 | } |
| 804 | if (code == 1) |
| 805 | av_log(avctx, AV_LOG_ERROR, "SkipCell procedure not implemented yet!\n"); |
| 806 | |
| 807 | CHECK_CELL |
| 808 | if (!curr_cell.mv_ptr) |
| 809 | return AVERROR_INVALIDDATA; |
| 810 | |
| 811 | ret = copy_cell(ctx, plane, &curr_cell); |
| 812 | return ret; |
| 813 | } |
| 814 | break; |
| 815 | case INTER_DATA: |
| 816 | if (!curr_cell.tree) { /* MC tree INTER code */ |
| 817 | unsigned mv_idx; |
| 818 | /* get motion vector index and setup the pointer to the mv set */ |
| 819 | if (!ctx->need_resync) |
| 820 | ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3]; |
| 821 | if (ctx->next_cell_data >= ctx->last_byte) { |
| 822 | av_log(avctx, AV_LOG_ERROR, "motion vector out of array\n"); |
| 823 | return AVERROR_INVALIDDATA; |
| 824 | } |
| 825 | mv_idx = *(ctx->next_cell_data++); |
| 826 | if (mv_idx >= ctx->num_vectors) { |
| 827 | av_log(avctx, AV_LOG_ERROR, "motion vector index out of range\n"); |
| 828 | return AVERROR_INVALIDDATA; |
| 829 | } |
| 830 | curr_cell.mv_ptr = &ctx->mc_vectors[mv_idx << 1]; |
| 831 | curr_cell.tree = 1; /* enter the VQ tree */ |
| 832 | UPDATE_BITPOS(8); |
| 833 | } else { /* VQ tree DATA code */ |
| 834 | if (!ctx->need_resync) |
| 835 | ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3]; |
| 836 | |
| 837 | CHECK_CELL |
| 838 | bytes_used = decode_cell(ctx, avctx, plane, &curr_cell, |
| 839 | ctx->next_cell_data, ctx->last_byte); |
| 840 | if (bytes_used < 0) |
| 841 | return AVERROR_INVALIDDATA; |
| 842 | |
| 843 | UPDATE_BITPOS(bytes_used << 3); |
| 844 | ctx->next_cell_data += bytes_used; |
| 845 | return 0; |
| 846 | } |
| 847 | break; |
| 848 | } |
| 849 | }//while |
| 850 | |
| 851 | return AVERROR_INVALIDDATA; |
| 852 | } |
| 853 | |
| 854 | |
| 855 | static int decode_plane(Indeo3DecodeContext *ctx, AVCodecContext *avctx, |
| 856 | Plane *plane, const uint8_t *data, int32_t data_size, |
| 857 | int32_t strip_width) |
| 858 | { |
| 859 | Cell curr_cell; |
| 860 | unsigned num_vectors; |
| 861 | |
| 862 | /* each plane data starts with mc_vector_count field, */ |
| 863 | /* an optional array of motion vectors followed by the vq data */ |
| 864 | num_vectors = bytestream_get_le32(&data); data_size -= 4; |
| 865 | if (num_vectors > 256) { |
| 866 | av_log(ctx->avctx, AV_LOG_ERROR, |
| 867 | "Read invalid number of motion vectors %d\n", num_vectors); |
| 868 | return AVERROR_INVALIDDATA; |
| 869 | } |
| 870 | if (num_vectors * 2 > data_size) |
| 871 | return AVERROR_INVALIDDATA; |
| 872 | |
| 873 | ctx->num_vectors = num_vectors; |
| 874 | ctx->mc_vectors = num_vectors ? data : 0; |
| 875 | |
| 876 | /* init the bitreader */ |
| 877 | init_get_bits(&ctx->gb, &data[num_vectors * 2], (data_size - num_vectors * 2) << 3); |
| 878 | ctx->skip_bits = 0; |
| 879 | ctx->need_resync = 0; |
| 880 | |
| 881 | ctx->last_byte = data + data_size; |
| 882 | |
| 883 | /* initialize the 1st cell and set its dimensions to whole plane */ |
| 884 | curr_cell.xpos = curr_cell.ypos = 0; |
| 885 | curr_cell.width = plane->width >> 2; |
| 886 | curr_cell.height = plane->height >> 2; |
| 887 | curr_cell.tree = 0; // we are in the MC tree now |
| 888 | curr_cell.mv_ptr = 0; // no motion vector = INTRA cell |
| 889 | |
| 890 | return parse_bintree(ctx, avctx, plane, INTRA_NULL, &curr_cell, CELL_STACK_MAX, strip_width); |
| 891 | } |
| 892 | |
| 893 | |
| 894 | #define OS_HDR_ID MKBETAG('F', 'R', 'M', 'H') |
| 895 | |
| 896 | static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx, |
| 897 | const uint8_t *buf, int buf_size) |
| 898 | { |
| 899 | GetByteContext gb; |
| 900 | const uint8_t *bs_hdr; |
| 901 | uint32_t frame_num, word2, check_sum, data_size; |
| 902 | int y_offset, u_offset, v_offset; |
| 903 | uint32_t starts[3], ends[3]; |
| 904 | uint16_t height, width; |
| 905 | int i, j; |
| 906 | |
| 907 | bytestream2_init(&gb, buf, buf_size); |
| 908 | |
| 909 | /* parse and check the OS header */ |
| 910 | frame_num = bytestream2_get_le32(&gb); |
| 911 | word2 = bytestream2_get_le32(&gb); |
| 912 | check_sum = bytestream2_get_le32(&gb); |
| 913 | data_size = bytestream2_get_le32(&gb); |
| 914 | |
| 915 | if ((frame_num ^ word2 ^ data_size ^ OS_HDR_ID) != check_sum) { |
| 916 | av_log(avctx, AV_LOG_ERROR, "OS header checksum mismatch!\n"); |
| 917 | return AVERROR_INVALIDDATA; |
| 918 | } |
| 919 | |
| 920 | /* parse the bitstream header */ |
| 921 | bs_hdr = gb.buffer; |
| 922 | |
| 923 | if (bytestream2_get_le16(&gb) != 32) { |
| 924 | av_log(avctx, AV_LOG_ERROR, "Unsupported codec version!\n"); |
| 925 | return AVERROR_INVALIDDATA; |
| 926 | } |
| 927 | |
| 928 | ctx->frame_num = frame_num; |
| 929 | ctx->frame_flags = bytestream2_get_le16(&gb); |
| 930 | ctx->data_size = (bytestream2_get_le32(&gb) + 7) >> 3; |
| 931 | ctx->cb_offset = bytestream2_get_byte(&gb); |
| 932 | |
| 933 | if (ctx->data_size == 16) |
| 934 | return 4; |
| 935 | ctx->data_size = FFMIN(ctx->data_size, buf_size - 16); |
| 936 | |
| 937 | bytestream2_skip(&gb, 3); // skip reserved byte and checksum |
| 938 | |
| 939 | /* check frame dimensions */ |
| 940 | height = bytestream2_get_le16(&gb); |
| 941 | width = bytestream2_get_le16(&gb); |
| 942 | if (av_image_check_size(width, height, 0, avctx)) |
| 943 | return AVERROR_INVALIDDATA; |
| 944 | |
| 945 | if (width != ctx->width || height != ctx->height) { |
| 946 | int res; |
| 947 | |
| 948 | av_dlog(avctx, "Frame dimensions changed!\n"); |
| 949 | |
| 950 | if (width < 16 || width > 640 || |
| 951 | height < 16 || height > 480 || |
| 952 | width & 3 || height & 3) { |
| 953 | av_log(avctx, AV_LOG_ERROR, |
| 954 | "Invalid picture dimensions: %d x %d!\n", width, height); |
| 955 | return AVERROR_INVALIDDATA; |
| 956 | } |
| 957 | free_frame_buffers(ctx); |
| 958 | if ((res = allocate_frame_buffers(ctx, avctx, width, height)) < 0) |
| 959 | return res; |
| 960 | if ((res = ff_set_dimensions(avctx, width, height)) < 0) |
| 961 | return res; |
| 962 | } |
| 963 | |
| 964 | y_offset = bytestream2_get_le32(&gb); |
| 965 | v_offset = bytestream2_get_le32(&gb); |
| 966 | u_offset = bytestream2_get_le32(&gb); |
| 967 | bytestream2_skip(&gb, 4); |
| 968 | |
| 969 | /* unfortunately there is no common order of planes in the buffer */ |
| 970 | /* so we use that sorting algo for determining planes data sizes */ |
| 971 | starts[0] = y_offset; |
| 972 | starts[1] = v_offset; |
| 973 | starts[2] = u_offset; |
| 974 | |
| 975 | for (j = 0; j < 3; j++) { |
| 976 | ends[j] = ctx->data_size; |
| 977 | for (i = 2; i >= 0; i--) |
| 978 | if (starts[i] < ends[j] && starts[i] > starts[j]) |
| 979 | ends[j] = starts[i]; |
| 980 | } |
| 981 | |
| 982 | ctx->y_data_size = ends[0] - starts[0]; |
| 983 | ctx->v_data_size = ends[1] - starts[1]; |
| 984 | ctx->u_data_size = ends[2] - starts[2]; |
| 985 | if (FFMIN3(y_offset, v_offset, u_offset) < 0 || |
| 986 | FFMAX3(y_offset, v_offset, u_offset) >= ctx->data_size - 16 || |
| 987 | FFMIN3(y_offset, v_offset, u_offset) < gb.buffer - bs_hdr + 16 || |
| 988 | FFMIN3(ctx->y_data_size, ctx->v_data_size, ctx->u_data_size) <= 0) { |
| 989 | av_log(avctx, AV_LOG_ERROR, "One of the y/u/v offsets is invalid\n"); |
| 990 | return AVERROR_INVALIDDATA; |
| 991 | } |
| 992 | |
| 993 | ctx->y_data_ptr = bs_hdr + y_offset; |
| 994 | ctx->v_data_ptr = bs_hdr + v_offset; |
| 995 | ctx->u_data_ptr = bs_hdr + u_offset; |
| 996 | ctx->alt_quant = gb.buffer; |
| 997 | |
| 998 | if (ctx->data_size == 16) { |
| 999 | av_log(avctx, AV_LOG_DEBUG, "Sync frame encountered!\n"); |
| 1000 | return 16; |
| 1001 | } |
| 1002 | |
| 1003 | if (ctx->frame_flags & BS_8BIT_PEL) { |
| 1004 | avpriv_request_sample(avctx, "8-bit pixel format"); |
| 1005 | return AVERROR_PATCHWELCOME; |
| 1006 | } |
| 1007 | |
| 1008 | if (ctx->frame_flags & BS_MV_X_HALF || ctx->frame_flags & BS_MV_Y_HALF) { |
| 1009 | avpriv_request_sample(avctx, "Halfpel motion vectors"); |
| 1010 | return AVERROR_PATCHWELCOME; |
| 1011 | } |
| 1012 | |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
| 1016 | |
| 1017 | /** |
| 1018 | * Convert and output the current plane. |
| 1019 | * All pixel values will be upsampled by shifting right by one bit. |
| 1020 | * |
| 1021 | * @param[in] plane pointer to the descriptor of the plane being processed |
| 1022 | * @param[in] buf_sel indicates which frame buffer the input data stored in |
| 1023 | * @param[out] dst pointer to the buffer receiving converted pixels |
| 1024 | * @param[in] dst_pitch pitch for moving to the next y line |
| 1025 | * @param[in] dst_height output plane height |
| 1026 | */ |
| 1027 | static void output_plane(const Plane *plane, int buf_sel, uint8_t *dst, |
| 1028 | int dst_pitch, int dst_height) |
| 1029 | { |
| 1030 | int x,y; |
| 1031 | const uint8_t *src = plane->pixels[buf_sel]; |
| 1032 | uint32_t pitch = plane->pitch; |
| 1033 | |
| 1034 | dst_height = FFMIN(dst_height, plane->height); |
| 1035 | for (y = 0; y < dst_height; y++) { |
| 1036 | /* convert four pixels at once using SWAR */ |
| 1037 | for (x = 0; x < plane->width >> 2; x++) { |
| 1038 | AV_WN32A(dst, (AV_RN32A(src) & 0x7F7F7F7F) << 1); |
| 1039 | src += 4; |
| 1040 | dst += 4; |
| 1041 | } |
| 1042 | |
| 1043 | for (x <<= 2; x < plane->width; x++) |
| 1044 | *dst++ = *src++ << 1; |
| 1045 | |
| 1046 | src += pitch - plane->width; |
| 1047 | dst += dst_pitch - plane->width; |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | |
| 1052 | static av_cold int decode_init(AVCodecContext *avctx) |
| 1053 | { |
| 1054 | Indeo3DecodeContext *ctx = avctx->priv_data; |
| 1055 | |
| 1056 | ctx->avctx = avctx; |
| 1057 | avctx->pix_fmt = AV_PIX_FMT_YUV410P; |
| 1058 | |
| 1059 | build_requant_tab(); |
| 1060 | |
| 1061 | ff_hpeldsp_init(&ctx->hdsp, avctx->flags); |
| 1062 | |
| 1063 | return allocate_frame_buffers(ctx, avctx, avctx->width, avctx->height); |
| 1064 | } |
| 1065 | |
| 1066 | |
| 1067 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| 1068 | AVPacket *avpkt) |
| 1069 | { |
| 1070 | Indeo3DecodeContext *ctx = avctx->priv_data; |
| 1071 | const uint8_t *buf = avpkt->data; |
| 1072 | int buf_size = avpkt->size; |
| 1073 | AVFrame *frame = data; |
| 1074 | int res; |
| 1075 | |
| 1076 | res = decode_frame_headers(ctx, avctx, buf, buf_size); |
| 1077 | if (res < 0) |
| 1078 | return res; |
| 1079 | |
| 1080 | /* skip sync(null) frames */ |
| 1081 | if (res) { |
| 1082 | // we have processed 16 bytes but no data was decoded |
| 1083 | *got_frame = 0; |
| 1084 | return buf_size; |
| 1085 | } |
| 1086 | |
| 1087 | /* skip droppable INTER frames if requested */ |
| 1088 | if (ctx->frame_flags & BS_NONREF && |
| 1089 | (avctx->skip_frame >= AVDISCARD_NONREF)) |
| 1090 | return 0; |
| 1091 | |
| 1092 | /* skip INTER frames if requested */ |
| 1093 | if (!(ctx->frame_flags & BS_KEYFRAME) && avctx->skip_frame >= AVDISCARD_NONKEY) |
| 1094 | return 0; |
| 1095 | |
| 1096 | /* use BS_BUFFER flag for buffer switching */ |
| 1097 | ctx->buf_sel = (ctx->frame_flags >> BS_BUFFER) & 1; |
| 1098 | |
| 1099 | if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
| 1100 | return res; |
| 1101 | |
| 1102 | /* decode luma plane */ |
| 1103 | if ((res = decode_plane(ctx, avctx, ctx->planes, ctx->y_data_ptr, ctx->y_data_size, 40))) |
| 1104 | return res; |
| 1105 | |
| 1106 | /* decode chroma planes */ |
| 1107 | if ((res = decode_plane(ctx, avctx, &ctx->planes[1], ctx->u_data_ptr, ctx->u_data_size, 10))) |
| 1108 | return res; |
| 1109 | |
| 1110 | if ((res = decode_plane(ctx, avctx, &ctx->planes[2], ctx->v_data_ptr, ctx->v_data_size, 10))) |
| 1111 | return res; |
| 1112 | |
| 1113 | output_plane(&ctx->planes[0], ctx->buf_sel, |
| 1114 | frame->data[0], frame->linesize[0], |
| 1115 | avctx->height); |
| 1116 | output_plane(&ctx->planes[1], ctx->buf_sel, |
| 1117 | frame->data[1], frame->linesize[1], |
| 1118 | (avctx->height + 3) >> 2); |
| 1119 | output_plane(&ctx->planes[2], ctx->buf_sel, |
| 1120 | frame->data[2], frame->linesize[2], |
| 1121 | (avctx->height + 3) >> 2); |
| 1122 | |
| 1123 | *got_frame = 1; |
| 1124 | |
| 1125 | return buf_size; |
| 1126 | } |
| 1127 | |
| 1128 | |
| 1129 | static av_cold int decode_close(AVCodecContext *avctx) |
| 1130 | { |
| 1131 | free_frame_buffers(avctx->priv_data); |
| 1132 | |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
| 1136 | AVCodec ff_indeo3_decoder = { |
| 1137 | .name = "indeo3", |
| 1138 | .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 3"), |
| 1139 | .type = AVMEDIA_TYPE_VIDEO, |
| 1140 | .id = AV_CODEC_ID_INDEO3, |
| 1141 | .priv_data_size = sizeof(Indeo3DecodeContext), |
| 1142 | .init = decode_init, |
| 1143 | .close = decode_close, |
| 1144 | .decode = decode_frame, |
| 1145 | .capabilities = CODEC_CAP_DR1, |
| 1146 | }; |