1/* 2 * VC-1 and WMV3 decoder 3 * Copyright (c) 2006-2007 Konstantin Shishkov 4 * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer 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#ifndef AVCODEC_VC1_H 24#define AVCODEC_VC1_H 25 26#include "avcodec.h" 27#include "mpegvideo.h" 28#include "intrax8.h" 29 30/** Markers used in VC-1 AP frame data */ 31//@{ 32enum VC1Code{ 33 VC1_CODE_RES0 = 0x00000100, 34 VC1_CODE_ENDOFSEQ = 0x0000010A, 35 VC1_CODE_SLICE, 36 VC1_CODE_FIELD, 37 VC1_CODE_FRAME, 38 VC1_CODE_ENTRYPOINT, 39 VC1_CODE_SEQHDR, 40}; 41//@} 42 43#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0) 44 45/** Available Profiles */ 46//@{ 47enum Profile { 48 PROFILE_SIMPLE, 49 PROFILE_MAIN, 50 PROFILE_COMPLEX, ///< TODO: WMV9 specific 51 PROFILE_ADVANCED 52}; 53//@} 54 55/** Sequence quantizer mode */ 56//@{ 57enum QuantMode { 58 QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level 59 QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level 60 QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames 61 QUANT_UNIFORM ///< Uniform quant used for all frames 62}; 63//@} 64 65/** Where quant can be changed */ 66//@{ 67enum DQProfile { 68 DQPROFILE_FOUR_EDGES, 69 DQPROFILE_DOUBLE_EDGES, 70 DQPROFILE_SINGLE_EDGE, 71 DQPROFILE_ALL_MBS 72}; 73//@} 74 75/** @name Where quant can be changed 76 */ 77//@{ 78enum DQSingleEdge { 79 DQSINGLE_BEDGE_LEFT, 80 DQSINGLE_BEDGE_TOP, 81 DQSINGLE_BEDGE_RIGHT, 82 DQSINGLE_BEDGE_BOTTOM 83}; 84//@} 85 86/** Which pair of edges is quantized with ALTPQUANT */ 87//@{ 88enum DQDoubleEdge { 89 DQDOUBLE_BEDGE_TOPLEFT, 90 DQDOUBLE_BEDGE_TOPRIGHT, 91 DQDOUBLE_BEDGE_BOTTOMRIGHT, 92 DQDOUBLE_BEDGE_BOTTOMLEFT 93}; 94//@} 95 96/** MV modes for P frames */ 97//@{ 98enum MVModes { 99 MV_PMODE_1MV_HPEL_BILIN, 100 MV_PMODE_1MV, 101 MV_PMODE_1MV_HPEL, 102 MV_PMODE_MIXED_MV, 103 MV_PMODE_INTENSITY_COMP 104}; 105//@} 106 107/** @name MV types for B frames */ 108//@{ 109enum BMVTypes { 110 BMV_TYPE_BACKWARD, 111 BMV_TYPE_FORWARD, 112 BMV_TYPE_INTERPOLATED 113}; 114//@} 115 116/** @name Block types for P/B frames */ 117//@{ 118enum TransformTypes { 119 TT_8X8, 120 TT_8X4_BOTTOM, 121 TT_8X4_TOP, 122 TT_8X4, //Both halves 123 TT_4X8_RIGHT, 124 TT_4X8_LEFT, 125 TT_4X8, //Both halves 126 TT_4X4 127}; 128//@} 129 130enum CodingSet { 131 CS_HIGH_MOT_INTRA = 0, 132 CS_HIGH_MOT_INTER, 133 CS_LOW_MOT_INTRA, 134 CS_LOW_MOT_INTER, 135 CS_MID_RATE_INTRA, 136 CS_MID_RATE_INTER, 137 CS_HIGH_RATE_INTRA, 138 CS_HIGH_RATE_INTER 139}; 140 141/** @name Overlap conditions for Advanced Profile */ 142//@{ 143enum COTypes { 144 CONDOVER_NONE = 0, 145 CONDOVER_ALL, 146 CONDOVER_SELECT 147}; 148//@} 149 150 151/** The VC1 Context 152 * @todo Change size wherever another size is more efficient 153 * Many members are only used for Advanced Profile 154 */ 155typedef struct VC1Context{ 156 MpegEncContext s; 157 IntraX8Context x8; 158 159 int bits; 160 161 /** Simple/Main Profile sequence header */ 162 //@{ 163 int res_sm; ///< reserved, 2b 164 int res_x8; ///< reserved 165 int multires; ///< frame-level RESPIC syntax element present 166 int res_fasttx; ///< reserved, always 1 167 int res_transtab; ///< reserved, always 0 168 int rangered; ///< RANGEREDFRM (range reduction) syntax element present 169 ///< at frame level 170 int res_rtm_flag; ///< reserved, set to 1 171 int reserved; ///< reserved 172 //@} 173 174 /** Advanced Profile */ 175 //@{ 176 int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer 177 int chromaformat; ///< 2bits, 2=4:2:0, only defined 178 int postprocflag; ///< Per-frame processing suggestion flag present 179 int broadcast; ///< TFF/RFF present 180 int interlace; ///< Progressive/interlaced (RPTFTM syntax element) 181 int tfcntrflag; ///< TFCNTR present 182 int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present 183 int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers 184 int extended_dmv; ///< Additional extended dmv range at P/B frame-level 185 int color_prim; ///< 8bits, chroma coordinates of the color primaries 186 int transfer_char; ///< 8bits, Opto-electronic transfer characteristics 187 int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix 188 int hrd_param_flag; ///< Presence of Hypothetical Reference 189 ///< Decoder parameters 190 int psf; ///< Progressive Segmented Frame 191 //@} 192 193 /** Sequence header data for all Profiles 194 * TODO: choose between ints, uint8_ts and monobit flags 195 */ 196 //@{ 197 int profile; ///< 2bits, Profile 198 int frmrtq_postproc; ///< 3bits, 199 int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength 200 int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple) 201 int extended_mv; ///< Ext MV in P/B (not in Simple) 202 int dquant; ///< How qscale varies with MBs, 2bits (not in Simple) 203 int vstransform; ///< variable-size [48]x[48] transform type + info 204 int overlap; ///< overlapped transforms in use 205 int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_* 206 int finterpflag; ///< INTERPFRM present 207 //@} 208 209 /** Frame decoding info for all profiles */ 210 //@{ 211 uint8_t mv_mode; ///< MV coding monde 212 uint8_t mv_mode2; ///< Secondary MV coding mode (B frames) 213 int k_x; ///< Number of bits for MVs (depends on MV range) 214 int k_y; ///< Number of bits for MVs (depends on MV range) 215 int range_x, range_y; ///< MV range 216 uint8_t pq, altpq; ///< Current/alternate frame quantizer scale 217 const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode 218 const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode 219 /** pquant parameters */ 220 //@{ 221 uint8_t dquantfrm; 222 uint8_t dqprofile; 223 uint8_t dqsbedge; 224 uint8_t dqbilevel; 225 //@} 226 /** AC coding set indexes 227 * @see 8.1.1.10, p(1)10 228 */ 229 //@{ 230 int c_ac_table_index; ///< Chroma index from ACFRM element 231 int y_ac_table_index; ///< Luma index from AC2FRM element 232 //@} 233 int ttfrm; ///< Transform type info present at frame level 234 uint8_t ttmbf; ///< Transform type flag 235 uint8_t ttblk4x4; ///< Value of ttblk which indicates a 4x4 transform 236 int codingset; ///< index of current table set from 11.8 to use for luma block decoding 237 int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding 238 int pqindex; ///< raw pqindex used in coding set selection 239 int a_avail, c_avail; 240 uint8_t *mb_type_base, *mb_type[3]; 241 242 243 /** Luma compensation parameters */ 244 //@{ 245 uint8_t lumscale; 246 uint8_t lumshift; 247 //@} 248 int16_t bfraction; ///< Relative position % anchors=> how to scale MVs 249 uint8_t halfpq; ///< Uniform quant over image and qp+.5 250 uint8_t respic; ///< Frame-level flag for resized images 251 int buffer_fullness; ///< HRD info 252 /** Ranges: 253 * -# 0 -> [-64n 63.f] x [-32, 31.f] 254 * -# 1 -> [-128, 127.f] x [-64, 63.f] 255 * -# 2 -> [-512, 511.f] x [-128, 127.f] 256 * -# 3 -> [-1024, 1023.f] x [-256, 255.f] 257 */ 258 uint8_t mvrange; 259 uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use 260 VLC *cbpcy_vlc; ///< CBPCY VLC table 261 int tt_index; ///< Index for Transform Type tables 262 uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV) 263 uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs 264 int mv_type_is_raw; ///< mv type mb plane is not coded 265 int dmb_is_raw; ///< direct mb plane is raw 266 int skip_is_raw; ///< skip mb plane is not coded 267 uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation 268 int use_ic; ///< use intensity compensation in B-frames 269 int rnd; ///< rounding control 270 271 /** Frame decoding info for S/M profiles only */ 272 //@{ 273 uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128) 274 uint8_t interpfrm; 275 //@} 276 277 /** Frame decoding info for Advanced profile */ 278 //@{ 279 uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace 280 uint8_t numpanscanwin; 281 uint8_t tfcntr; 282 uint8_t rptfrm, tff, rff; 283 uint16_t topleftx; 284 uint16_t toplefty; 285 uint16_t bottomrightx; 286 uint16_t bottomrighty; 287 uint8_t uvsamp; 288 uint8_t postproc; 289 int hrd_num_leaky_buckets; 290 uint8_t bit_rate_exponent; 291 uint8_t buffer_size_exponent; 292 uint8_t* acpred_plane; ///< AC prediction flags bitplane 293 int acpred_is_raw; 294 uint8_t* over_flags_plane; ///< Overflags bitplane 295 int overflg_is_raw; 296 uint8_t condover; 297 uint16_t *hrd_rate, *hrd_buffer; 298 uint8_t *hrd_fullness; 299 uint8_t range_mapy_flag; 300 uint8_t range_mapuv_flag; 301 uint8_t range_mapy; 302 uint8_t range_mapuv; 303 //@} 304 305 int p_frame_skipped; 306 int bi_type; 307 int x8_type; 308 309 uint32_t *cbp_base, *cbp; 310 uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[]) 311 uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element) 312 uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element) 313 314 int parse_only; ///< Context is used within parser 315 316 int warn_interlaced; 317} VC1Context; 318 319/** Find VC-1 marker in buffer 320 * @return position where next marker starts or end of buffer if no marker found 321 */ 322static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end) 323{ 324 uint32_t mrk = 0xFFFFFFFF; 325 326 if(end-src < 4) return end; 327 while(src < end){ 328 mrk = (mrk << 8) | *src++; 329 if(IS_MARKER(mrk)) 330 return src-4; 331 } 332 return end; 333} 334 335static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst) 336{ 337 int dsize = 0, i; 338 339 if(size < 4){ 340 for(dsize = 0; dsize < size; dsize++) *dst++ = *src++; 341 return size; 342 } 343 for(i = 0; i < size; i++, src++) { 344 if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) { 345 dst[dsize++] = src[1]; 346 src++; 347 i++; 348 } else 349 dst[dsize++] = *src; 350 } 351 return dsize; 352} 353 354/** 355 * Decode Simple/Main Profiles sequence header 356 * @see Figure 7-8, p16-17 357 * @param avctx Codec context 358 * @param gb GetBit context initialized from Codec context extra_data 359 * @return Status 360 */ 361int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb); 362 363int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb); 364 365int vc1_parse_frame_header (VC1Context *v, GetBitContext *gb); 366int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb); 367 368#endif /* AVCODEC_VC1_H */ 369