libavcodec/vc1.h

   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 //@{
  32 enum 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 //@{
  47 enum Profile {
  48     PROFILE_SIMPLE,
  49     PROFILE_MAIN,
  50     PROFILE_COMPLEX, ///< TODO: WMV9 specific
  51     PROFILE_ADVANCED
  52 };
  53 //@}
  54
  55 /** Sequence quantizer mode */
  56 //@{
  57 enum 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 //@{
  67 enum 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 //@{
  78 enum 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 //@{
  88 enum 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 //@{
  98 enum 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 //@{
 109 enum 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 //@{
 118 enum 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
 130 enum 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 //@{
 143 enum 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  */
 155 typedef 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 } VC1Context;
 316
 317 /** Find VC-1 marker in buffer
 318  * @return position where next marker starts or end of buffer if no marker found
 319  */
 320 static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
 321 {
 322     uint32_t mrk = 0xFFFFFFFF;
 323
 324     if(end-src < 4) return end;
 325     while(src < end){
 326         mrk = (mrk << 8) | *src++;
 327         if(IS_MARKER(mrk))
 328             return src-4;
 329     }
 330     return end;
 331 }
 332
 333 static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
 334 {
 335     int dsize = 0, i;
 336
 337     if(size < 4){
 338         for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
 339         return size;
 340     }
 341     for(i = 0; i < size; i++, src++) {
 342         if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
 343             dst[dsize++] = src[1];
 344             src++;
 345             i++;
 346         } else
 347             dst[dsize++] = *src;
 348     }
 349     return dsize;
 350 }
 351
 352 /**
 353  * Decode Simple/Main Profiles sequence header
 354  * @see Figure 7-8, p16-17
 355  * @param avctx Codec context
 356  * @param gb GetBit context initialized from Codec context extra_data
 357  * @return Status
 358  */
 359 int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
 360
 361 int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
 362
 363 int vc1_parse_frame_header    (VC1Context *v, GetBitContext *gb);
 364 int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
 365
 366 #endif /* AVCODEC_VC1_H */