1/* 2 * Apple ProRes compatible decoder 3 * 4 * Copyright (c) 2010-2011 Maxim Poliakovski 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 * This is a decoder for Apple ProRes 422 SD/HQ/LT/Proxy and ProRes 4444. 26 * It is used for storing and editing high definition video data in Apple's Final Cut Pro. 27 * 28 * @see http://wiki.multimedia.cx/index.php?title=Apple_ProRes 29 */ 30 31#define LONG_BITSTREAM_READER // some ProRes vlc codes require up to 28 bits to be read at once 32 33#include <stdint.h> 34 35#include "libavutil/intmath.h" 36#include "avcodec.h" 37#include "idctdsp.h" 38#include "internal.h" 39#include "proresdata.h" 40#include "proresdsp.h" 41#include "get_bits.h" 42 43typedef struct { 44 const uint8_t *index; ///< pointers to the data of this slice 45 int slice_num; 46 int x_pos, y_pos; 47 int slice_width; 48 int prev_slice_sf; ///< scalefactor of the previous decoded slice 49 DECLARE_ALIGNED(16, int16_t, blocks)[8 * 4 * 64]; 50 DECLARE_ALIGNED(16, int16_t, qmat_luma_scaled)[64]; 51 DECLARE_ALIGNED(16, int16_t, qmat_chroma_scaled)[64]; 52} ProresThreadData; 53 54typedef struct { 55 ProresDSPContext dsp; 56 AVFrame *frame; 57 ScanTable scantable; 58 int scantable_type; ///< -1 = uninitialized, 0 = progressive, 1/2 = interlaced 59 60 int frame_type; ///< 0 = progressive, 1 = top-field first, 2 = bottom-field first 61 int pic_format; ///< 2 = 422, 3 = 444 62 uint8_t qmat_luma[64]; ///< dequantization matrix for luma 63 uint8_t qmat_chroma[64]; ///< dequantization matrix for chroma 64 int qmat_changed; ///< 1 - global quantization matrices changed 65 int total_slices; ///< total number of slices in a picture 66 ProresThreadData *slice_data; 67 int pic_num; 68 int chroma_factor; 69 int mb_chroma_factor; 70 int num_chroma_blocks; ///< number of chrominance blocks in a macroblock 71 int num_x_slices; 72 int num_y_slices; 73 int slice_width_factor; 74 int slice_height_factor; 75 int num_x_mbs; 76 int num_y_mbs; 77 int alpha_info; 78} ProresContext; 79 80 81static av_cold int decode_init(AVCodecContext *avctx) 82{ 83 ProresContext *ctx = avctx->priv_data; 84 85 ctx->total_slices = 0; 86 ctx->slice_data = NULL; 87 88 avctx->bits_per_raw_sample = PRORES_BITS_PER_SAMPLE; 89 ff_proresdsp_init(&ctx->dsp, avctx); 90 91 ctx->scantable_type = -1; // set scantable type to uninitialized 92 memset(ctx->qmat_luma, 4, 64); 93 memset(ctx->qmat_chroma, 4, 64); 94 95 return 0; 96} 97 98 99static int decode_frame_header(ProresContext *ctx, const uint8_t *buf, 100 const int data_size, AVCodecContext *avctx) 101{ 102 int hdr_size, version, width, height, flags; 103 const uint8_t *ptr; 104 105 hdr_size = AV_RB16(buf); 106 if (hdr_size > data_size) { 107 av_log(avctx, AV_LOG_ERROR, "frame data too small\n"); 108 return AVERROR_INVALIDDATA; 109 } 110 111 version = AV_RB16(buf + 2); 112 if (version >= 2) { 113 av_log(avctx, AV_LOG_ERROR, 114 "unsupported header version: %d\n", version); 115 return AVERROR_INVALIDDATA; 116 } 117 118 width = AV_RB16(buf + 8); 119 height = AV_RB16(buf + 10); 120 if (width != avctx->width || height != avctx->height) { 121 av_log(avctx, AV_LOG_ERROR, 122 "picture dimension changed: old: %d x %d, new: %d x %d\n", 123 avctx->width, avctx->height, width, height); 124 return AVERROR_INVALIDDATA; 125 } 126 127 ctx->frame_type = (buf[12] >> 2) & 3; 128 if (ctx->frame_type > 2) { 129 av_log(avctx, AV_LOG_ERROR, 130 "unsupported frame type: %d\n", ctx->frame_type); 131 return AVERROR_INVALIDDATA; 132 } 133 134 ctx->chroma_factor = (buf[12] >> 6) & 3; 135 ctx->mb_chroma_factor = ctx->chroma_factor + 2; 136 ctx->num_chroma_blocks = (1 << ctx->chroma_factor) >> 1; 137 ctx->alpha_info = buf[17] & 0xf; 138 139 if (ctx->alpha_info > 2) { 140 av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info); 141 return AVERROR_INVALIDDATA; 142 } 143 if (avctx->skip_alpha) ctx->alpha_info = 0; 144 145 switch (ctx->chroma_factor) { 146 case 2: 147 avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA422P10 148 : AV_PIX_FMT_YUV422P10; 149 break; 150 case 3: 151 avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA444P10 152 : AV_PIX_FMT_YUV444P10; 153 break; 154 default: 155 av_log(avctx, AV_LOG_ERROR, 156 "unsupported picture format: %d\n", ctx->pic_format); 157 return AVERROR_INVALIDDATA; 158 } 159 160 if (ctx->scantable_type != ctx->frame_type) { 161 if (!ctx->frame_type) 162 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, 163 ff_prores_progressive_scan); 164 else 165 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, 166 ff_prores_interlaced_scan); 167 ctx->scantable_type = ctx->frame_type; 168 } 169 170 if (ctx->frame_type) { /* if interlaced */ 171 ctx->frame->interlaced_frame = 1; 172 ctx->frame->top_field_first = ctx->frame_type & 1; 173 } else { 174 ctx->frame->interlaced_frame = 0; 175 } 176 177 avctx->color_primaries = buf[14]; 178 avctx->color_trc = buf[15]; 179 avctx->colorspace = buf[16]; 180 181 ctx->qmat_changed = 0; 182 ptr = buf + 20; 183 flags = buf[19]; 184 if (flags & 2) { 185 if (ptr - buf > hdr_size - 64) { 186 av_log(avctx, AV_LOG_ERROR, "header data too small\n"); 187 return AVERROR_INVALIDDATA; 188 } 189 if (memcmp(ctx->qmat_luma, ptr, 64)) { 190 memcpy(ctx->qmat_luma, ptr, 64); 191 ctx->qmat_changed = 1; 192 } 193 ptr += 64; 194 } else { 195 memset(ctx->qmat_luma, 4, 64); 196 ctx->qmat_changed = 1; 197 } 198 199 if (flags & 1) { 200 if (ptr - buf > hdr_size - 64) { 201 av_log(avctx, AV_LOG_ERROR, "header data too small\n"); 202 return -1; 203 } 204 if (memcmp(ctx->qmat_chroma, ptr, 64)) { 205 memcpy(ctx->qmat_chroma, ptr, 64); 206 ctx->qmat_changed = 1; 207 } 208 } else { 209 memset(ctx->qmat_chroma, 4, 64); 210 ctx->qmat_changed = 1; 211 } 212 213 return hdr_size; 214} 215 216 217static int decode_picture_header(ProresContext *ctx, const uint8_t *buf, 218 const int data_size, AVCodecContext *avctx) 219{ 220 int i, hdr_size, pic_data_size, num_slices; 221 int slice_width_factor, slice_height_factor; 222 int remainder, num_x_slices; 223 const uint8_t *data_ptr, *index_ptr; 224 225 hdr_size = data_size > 0 ? buf[0] >> 3 : 0; 226 if (hdr_size < 8 || hdr_size > data_size) { 227 av_log(avctx, AV_LOG_ERROR, "picture header too small\n"); 228 return AVERROR_INVALIDDATA; 229 } 230 231 pic_data_size = AV_RB32(buf + 1); 232 if (pic_data_size > data_size) { 233 av_log(avctx, AV_LOG_ERROR, "picture data too small\n"); 234 return AVERROR_INVALIDDATA; 235 } 236 237 slice_width_factor = buf[7] >> 4; 238 slice_height_factor = buf[7] & 0xF; 239 if (slice_width_factor > 3 || slice_height_factor) { 240 av_log(avctx, AV_LOG_ERROR, 241 "unsupported slice dimension: %d x %d\n", 242 1 << slice_width_factor, 1 << slice_height_factor); 243 return AVERROR_INVALIDDATA; 244 } 245 246 ctx->slice_width_factor = slice_width_factor; 247 ctx->slice_height_factor = slice_height_factor; 248 249 ctx->num_x_mbs = (avctx->width + 15) >> 4; 250 ctx->num_y_mbs = (avctx->height + 251 (1 << (4 + ctx->frame->interlaced_frame)) - 1) >> 252 (4 + ctx->frame->interlaced_frame); 253 254 remainder = ctx->num_x_mbs & ((1 << slice_width_factor) - 1); 255 num_x_slices = (ctx->num_x_mbs >> slice_width_factor) + (remainder & 1) + 256 ((remainder >> 1) & 1) + ((remainder >> 2) & 1); 257 258 num_slices = num_x_slices * ctx->num_y_mbs; 259 if (num_slices != AV_RB16(buf + 5)) { 260 av_log(avctx, AV_LOG_ERROR, "invalid number of slices\n"); 261 return AVERROR_INVALIDDATA; 262 } 263 264 if (ctx->total_slices != num_slices) { 265 av_freep(&ctx->slice_data); 266 ctx->slice_data = av_malloc((num_slices + 1) * sizeof(ctx->slice_data[0])); 267 if (!ctx->slice_data) 268 return AVERROR(ENOMEM); 269 ctx->total_slices = num_slices; 270 } 271 272 if (hdr_size + num_slices * 2 > data_size) { 273 av_log(avctx, AV_LOG_ERROR, "slice table too small\n"); 274 return AVERROR_INVALIDDATA; 275 } 276 277 /* parse slice table allowing quick access to the slice data */ 278 index_ptr = buf + hdr_size; 279 data_ptr = index_ptr + num_slices * 2; 280 281 for (i = 0; i < num_slices; i++) { 282 ctx->slice_data[i].index = data_ptr; 283 ctx->slice_data[i].prev_slice_sf = 0; 284 data_ptr += AV_RB16(index_ptr + i * 2); 285 } 286 ctx->slice_data[i].index = data_ptr; 287 ctx->slice_data[i].prev_slice_sf = 0; 288 289 if (data_ptr > buf + data_size) { 290 av_log(avctx, AV_LOG_ERROR, "out of slice data\n"); 291 return -1; 292 } 293 294 return pic_data_size; 295} 296 297 298/** 299 * Read an unsigned rice/exp golomb codeword. 300 */ 301static inline int decode_vlc_codeword(GetBitContext *gb, unsigned codebook) 302{ 303 unsigned int rice_order, exp_order, switch_bits; 304 unsigned int buf, code; 305 int log, prefix_len, len; 306 307 OPEN_READER(re, gb); 308 UPDATE_CACHE(re, gb); 309 buf = GET_CACHE(re, gb); 310 311 /* number of prefix bits to switch between Rice and expGolomb */ 312 switch_bits = (codebook & 3) + 1; 313 rice_order = codebook >> 5; /* rice code order */ 314 exp_order = (codebook >> 2) & 7; /* exp golomb code order */ 315 316 log = 31 - av_log2(buf); /* count prefix bits (zeroes) */ 317 318 if (log < switch_bits) { /* ok, we got a rice code */ 319 if (!rice_order) { 320 /* shortcut for faster decoding of rice codes without remainder */ 321 code = log; 322 LAST_SKIP_BITS(re, gb, log + 1); 323 } else { 324 prefix_len = log + 1; 325 code = (log << rice_order) + NEG_USR32(buf << prefix_len, rice_order); 326 LAST_SKIP_BITS(re, gb, prefix_len + rice_order); 327 } 328 } else { /* otherwise we got a exp golomb code */ 329 len = (log << 1) - switch_bits + exp_order + 1; 330 code = NEG_USR32(buf, len) - (1 << exp_order) + (switch_bits << rice_order); 331 LAST_SKIP_BITS(re, gb, len); 332 } 333 334 CLOSE_READER(re, gb); 335 336 return code; 337} 338 339#define LSB2SIGN(x) (-((x) & 1)) 340#define TOSIGNED(x) (((x) >> 1) ^ LSB2SIGN(x)) 341 342/** 343 * Decode DC coefficients for all blocks in a slice. 344 */ 345static inline void decode_dc_coeffs(GetBitContext *gb, int16_t *out, 346 int nblocks) 347{ 348 int16_t prev_dc; 349 int i, sign; 350 int16_t delta; 351 unsigned int code; 352 353 code = decode_vlc_codeword(gb, FIRST_DC_CB); 354 out[0] = prev_dc = TOSIGNED(code); 355 356 out += 64; /* move to the DC coeff of the next block */ 357 delta = 3; 358 359 for (i = 1; i < nblocks; i++, out += 64) { 360 code = decode_vlc_codeword(gb, ff_prores_dc_codebook[FFMIN(FFABS(delta), 3)]); 361 362 sign = -(((delta >> 15) & 1) ^ (code & 1)); 363 delta = (((code + 1) >> 1) ^ sign) - sign; 364 prev_dc += delta; 365 out[0] = prev_dc; 366 } 367} 368 369 370/** 371 * Decode AC coefficients for all blocks in a slice. 372 */ 373static inline int decode_ac_coeffs(GetBitContext *gb, int16_t *out, 374 int blocks_per_slice, 375 int plane_size_factor, 376 const uint8_t *scan) 377{ 378 int pos, block_mask, run, level, sign, run_cb_index, lev_cb_index; 379 int max_coeffs, bits_left; 380 381 /* set initial prediction values */ 382 run = 4; 383 level = 2; 384 385 max_coeffs = blocks_per_slice << 6; 386 block_mask = blocks_per_slice - 1; 387 388 for (pos = blocks_per_slice - 1; pos < max_coeffs;) { 389 run_cb_index = ff_prores_run_to_cb_index[FFMIN(run, 15)]; 390 lev_cb_index = ff_prores_lev_to_cb_index[FFMIN(level, 9)]; 391 392 bits_left = get_bits_left(gb); 393 if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left))) 394 return 0; 395 396 run = decode_vlc_codeword(gb, ff_prores_ac_codebook[run_cb_index]); 397 if (run < 0) 398 return AVERROR_INVALIDDATA; 399 400 bits_left = get_bits_left(gb); 401 if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left))) 402 return AVERROR_INVALIDDATA; 403 404 level = decode_vlc_codeword(gb, ff_prores_ac_codebook[lev_cb_index]) + 1; 405 if (level < 0) 406 return AVERROR_INVALIDDATA; 407 408 pos += run + 1; 409 if (pos >= max_coeffs) 410 break; 411 412 sign = get_sbits(gb, 1); 413 out[((pos & block_mask) << 6) + scan[pos >> plane_size_factor]] = 414 (level ^ sign) - sign; 415 } 416 417 return 0; 418} 419 420 421/** 422 * Decode a slice plane (luma or chroma). 423 */ 424static int decode_slice_plane(ProresContext *ctx, ProresThreadData *td, 425 const uint8_t *buf, 426 int data_size, uint16_t *out_ptr, 427 int linesize, int mbs_per_slice, 428 int blocks_per_mb, int plane_size_factor, 429 const int16_t *qmat, int is_chroma) 430{ 431 GetBitContext gb; 432 int16_t *block_ptr; 433 int mb_num, blocks_per_slice, ret; 434 435 blocks_per_slice = mbs_per_slice * blocks_per_mb; 436 437 memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks)); 438 439 init_get_bits(&gb, buf, data_size << 3); 440 441 decode_dc_coeffs(&gb, td->blocks, blocks_per_slice); 442 443 ret = decode_ac_coeffs(&gb, td->blocks, blocks_per_slice, 444 plane_size_factor, ctx->scantable.permutated); 445 if (ret < 0) 446 return ret; 447 448 /* inverse quantization, inverse transform and output */ 449 block_ptr = td->blocks; 450 451 if (!is_chroma) { 452 for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) { 453 ctx->dsp.idct_put(out_ptr, linesize, block_ptr, qmat); 454 block_ptr += 64; 455 if (blocks_per_mb > 2) { 456 ctx->dsp.idct_put(out_ptr + 8, linesize, block_ptr, qmat); 457 block_ptr += 64; 458 } 459 ctx->dsp.idct_put(out_ptr + linesize * 4, linesize, block_ptr, qmat); 460 block_ptr += 64; 461 if (blocks_per_mb > 2) { 462 ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat); 463 block_ptr += 64; 464 } 465 } 466 } else { 467 for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) { 468 ctx->dsp.idct_put(out_ptr, linesize, block_ptr, qmat); 469 block_ptr += 64; 470 ctx->dsp.idct_put(out_ptr + linesize * 4, linesize, block_ptr, qmat); 471 block_ptr += 64; 472 if (blocks_per_mb > 2) { 473 ctx->dsp.idct_put(out_ptr + 8, linesize, block_ptr, qmat); 474 block_ptr += 64; 475 ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat); 476 block_ptr += 64; 477 } 478 } 479 } 480 return 0; 481} 482 483 484static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs, 485 const int num_bits) 486{ 487 const int mask = (1 << num_bits) - 1; 488 int i, idx, val, alpha_val; 489 490 idx = 0; 491 alpha_val = mask; 492 do { 493 do { 494 if (get_bits1(gb)) 495 val = get_bits(gb, num_bits); 496 else { 497 int sign; 498 val = get_bits(gb, num_bits == 16 ? 7 : 4); 499 sign = val & 1; 500 val = (val + 2) >> 1; 501 if (sign) 502 val = -val; 503 } 504 alpha_val = (alpha_val + val) & mask; 505 if (num_bits == 16) 506 dst[idx++] = alpha_val >> 6; 507 else 508 dst[idx++] = (alpha_val << 2) | (alpha_val >> 6); 509 if (idx >= num_coeffs) { 510 break; 511 } 512 } while (get_bits1(gb)); 513 val = get_bits(gb, 4); 514 if (!val) 515 val = get_bits(gb, 11); 516 if (idx + val > num_coeffs) 517 val = num_coeffs - idx; 518 if (num_bits == 16) 519 for (i = 0; i < val; i++) 520 dst[idx++] = alpha_val >> 6; 521 else 522 for (i = 0; i < val; i++) 523 dst[idx++] = (alpha_val << 2) | (alpha_val >> 6); 524 } while (idx < num_coeffs); 525} 526 527/** 528 * Decode alpha slice plane. 529 */ 530static void decode_alpha_plane(ProresContext *ctx, ProresThreadData *td, 531 const uint8_t *buf, int data_size, 532 uint16_t *out_ptr, int linesize, 533 int mbs_per_slice) 534{ 535 GetBitContext gb; 536 int i; 537 uint16_t *block_ptr; 538 539 memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks)); 540 541 init_get_bits(&gb, buf, data_size << 3); 542 543 if (ctx->alpha_info == 2) 544 unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 16); 545 else 546 unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 8); 547 548 block_ptr = td->blocks; 549 550 for (i = 0; i < 16; i++) { 551 memcpy(out_ptr, block_ptr, 16 * mbs_per_slice * sizeof(*out_ptr)); 552 out_ptr += linesize >> 1; 553 block_ptr += 16 * mbs_per_slice; 554 } 555} 556 557static int decode_slice(AVCodecContext *avctx, void *tdata) 558{ 559 ProresThreadData *td = tdata; 560 ProresContext *ctx = avctx->priv_data; 561 int mb_x_pos = td->x_pos; 562 int mb_y_pos = td->y_pos; 563 int pic_num = ctx->pic_num; 564 int slice_num = td->slice_num; 565 int mbs_per_slice = td->slice_width; 566 const uint8_t *buf; 567 uint8_t *y_data, *u_data, *v_data, *a_data; 568 AVFrame *pic = ctx->frame; 569 int i, sf, slice_width_factor; 570 int slice_data_size, hdr_size; 571 int y_data_size, u_data_size, v_data_size, a_data_size; 572 int y_linesize, u_linesize, v_linesize, a_linesize; 573 int coff[4]; 574 int ret; 575 576 buf = ctx->slice_data[slice_num].index; 577 slice_data_size = ctx->slice_data[slice_num + 1].index - buf; 578 579 slice_width_factor = av_log2(mbs_per_slice); 580 581 y_data = pic->data[0]; 582 u_data = pic->data[1]; 583 v_data = pic->data[2]; 584 a_data = pic->data[3]; 585 y_linesize = pic->linesize[0]; 586 u_linesize = pic->linesize[1]; 587 v_linesize = pic->linesize[2]; 588 a_linesize = pic->linesize[3]; 589 590 if (pic->interlaced_frame) { 591 if (!(pic_num ^ pic->top_field_first)) { 592 y_data += y_linesize; 593 u_data += u_linesize; 594 v_data += v_linesize; 595 if (a_data) 596 a_data += a_linesize; 597 } 598 y_linesize <<= 1; 599 u_linesize <<= 1; 600 v_linesize <<= 1; 601 a_linesize <<= 1; 602 } 603 y_data += (mb_y_pos << 4) * y_linesize + (mb_x_pos << 5); 604 u_data += (mb_y_pos << 4) * u_linesize + (mb_x_pos << ctx->mb_chroma_factor); 605 v_data += (mb_y_pos << 4) * v_linesize + (mb_x_pos << ctx->mb_chroma_factor); 606 if (a_data) 607 a_data += (mb_y_pos << 4) * a_linesize + (mb_x_pos << 5); 608 609 if (slice_data_size < 6) { 610 av_log(avctx, AV_LOG_ERROR, "slice data too small\n"); 611 return AVERROR_INVALIDDATA; 612 } 613 614 /* parse slice header */ 615 hdr_size = buf[0] >> 3; 616 coff[0] = hdr_size; 617 y_data_size = AV_RB16(buf + 2); 618 coff[1] = coff[0] + y_data_size; 619 u_data_size = AV_RB16(buf + 4); 620 coff[2] = coff[1] + u_data_size; 621 v_data_size = hdr_size > 7 ? AV_RB16(buf + 6) : slice_data_size - coff[2]; 622 coff[3] = coff[2] + v_data_size; 623 a_data_size = ctx->alpha_info ? slice_data_size - coff[3] : 0; 624 625 /* if V or alpha component size is negative that means that previous 626 component sizes are too large */ 627 if (v_data_size < 0 || a_data_size < 0 || hdr_size < 6) { 628 av_log(avctx, AV_LOG_ERROR, "invalid data size\n"); 629 return AVERROR_INVALIDDATA; 630 } 631 632 sf = av_clip(buf[1], 1, 224); 633 sf = sf > 128 ? (sf - 96) << 2 : sf; 634 635 /* scale quantization matrixes according with slice's scale factor */ 636 /* TODO: this can be SIMD-optimized a lot */ 637 if (ctx->qmat_changed || sf != td->prev_slice_sf) { 638 td->prev_slice_sf = sf; 639 for (i = 0; i < 64; i++) { 640 td->qmat_luma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_luma[i] * sf; 641 td->qmat_chroma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_chroma[i] * sf; 642 } 643 } 644 645 /* decode luma plane */ 646 ret = decode_slice_plane(ctx, td, buf + coff[0], y_data_size, 647 (uint16_t*) y_data, y_linesize, 648 mbs_per_slice, 4, slice_width_factor + 2, 649 td->qmat_luma_scaled, 0); 650 651 if (ret < 0) 652 return ret; 653 654 /* decode U chroma plane */ 655 ret = decode_slice_plane(ctx, td, buf + coff[1], u_data_size, 656 (uint16_t*) u_data, u_linesize, 657 mbs_per_slice, ctx->num_chroma_blocks, 658 slice_width_factor + ctx->chroma_factor - 1, 659 td->qmat_chroma_scaled, 1); 660 if (ret < 0) 661 return ret; 662 663 /* decode V chroma plane */ 664 ret = decode_slice_plane(ctx, td, buf + coff[2], v_data_size, 665 (uint16_t*) v_data, v_linesize, 666 mbs_per_slice, ctx->num_chroma_blocks, 667 slice_width_factor + ctx->chroma_factor - 1, 668 td->qmat_chroma_scaled, 1); 669 if (ret < 0) 670 return ret; 671 672 /* decode alpha plane if available */ 673 if (a_data && a_data_size) 674 decode_alpha_plane(ctx, td, buf + coff[3], a_data_size, 675 (uint16_t*) a_data, a_linesize, 676 mbs_per_slice); 677 678 return 0; 679} 680 681 682static int decode_picture(ProresContext *ctx, int pic_num, 683 AVCodecContext *avctx) 684{ 685 int slice_num, slice_width, x_pos, y_pos; 686 687 slice_num = 0; 688 689 ctx->pic_num = pic_num; 690 for (y_pos = 0; y_pos < ctx->num_y_mbs; y_pos++) { 691 slice_width = 1 << ctx->slice_width_factor; 692 693 for (x_pos = 0; x_pos < ctx->num_x_mbs && slice_width; 694 x_pos += slice_width) { 695 while (ctx->num_x_mbs - x_pos < slice_width) 696 slice_width >>= 1; 697 698 ctx->slice_data[slice_num].slice_num = slice_num; 699 ctx->slice_data[slice_num].x_pos = x_pos; 700 ctx->slice_data[slice_num].y_pos = y_pos; 701 ctx->slice_data[slice_num].slice_width = slice_width; 702 703 slice_num++; 704 } 705 } 706 707 return avctx->execute(avctx, decode_slice, 708 ctx->slice_data, NULL, slice_num, 709 sizeof(ctx->slice_data[0])); 710} 711 712 713#define MOVE_DATA_PTR(nbytes) buf += (nbytes); buf_size -= (nbytes) 714 715static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, 716 AVPacket *avpkt) 717{ 718 ProresContext *ctx = avctx->priv_data; 719 const uint8_t *buf = avpkt->data; 720 int buf_size = avpkt->size; 721 int frame_hdr_size, pic_num, pic_data_size; 722 723 ctx->frame = data; 724 ctx->frame->pict_type = AV_PICTURE_TYPE_I; 725 ctx->frame->key_frame = 1; 726 727 /* check frame atom container */ 728 if (buf_size < 28 || buf_size < AV_RB32(buf) || 729 AV_RB32(buf + 4) != FRAME_ID) { 730 av_log(avctx, AV_LOG_ERROR, "invalid frame\n"); 731 return AVERROR_INVALIDDATA; 732 } 733 734 MOVE_DATA_PTR(8); 735 736 frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx); 737 if (frame_hdr_size < 0) 738 return AVERROR_INVALIDDATA; 739 740 MOVE_DATA_PTR(frame_hdr_size); 741 742 if (ff_get_buffer(avctx, ctx->frame, 0) < 0) 743 return -1; 744 745 for (pic_num = 0; ctx->frame->interlaced_frame - pic_num + 1; pic_num++) { 746 pic_data_size = decode_picture_header(ctx, buf, buf_size, avctx); 747 if (pic_data_size < 0) 748 return AVERROR_INVALIDDATA; 749 750 if (decode_picture(ctx, pic_num, avctx)) 751 return -1; 752 753 MOVE_DATA_PTR(pic_data_size); 754 } 755 756 ctx->frame = NULL; 757 *got_frame = 1; 758 759 return avpkt->size; 760} 761 762 763static av_cold int decode_close(AVCodecContext *avctx) 764{ 765 ProresContext *ctx = avctx->priv_data; 766 767 av_freep(&ctx->slice_data); 768 769 return 0; 770} 771 772 773AVCodec ff_prores_lgpl_decoder = { 774 .name = "prores_lgpl", 775 .long_name = NULL_IF_CONFIG_SMALL("Apple ProRes (iCodec Pro)"), 776 .type = AVMEDIA_TYPE_VIDEO, 777 .id = AV_CODEC_ID_PRORES, 778 .priv_data_size = sizeof(ProresContext), 779 .init = decode_init, 780 .close = decode_close, 781 .decode = decode_frame, 782 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS, 783}; 784