libavcodec/h264.h

   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   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 h264.h
  24  * H.264 / AVC / MPEG4 part10 codec.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #ifndef FFMPEG_H264_H
  29 #define FFMPEG_H264_H
  30
  31 #include "dsputil.h"
  32 #include "cabac.h"
  33 #include "mpegvideo.h"
  34 #include "h264pred.h"
  35
  36 #define interlaced_dct interlaced_dct_is_a_bad_name
  37 #define mb_intra mb_intra_is_not_initialized_see_mb_type
  38
  39 #define LUMA_DC_BLOCK_INDEX   25
  40 #define CHROMA_DC_BLOCK_INDEX 26
  41
  42 #define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
  43 #define COEFF_TOKEN_VLC_BITS           8
  44 #define TOTAL_ZEROS_VLC_BITS           9
  45 #define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
  46 #define RUN_VLC_BITS                   3
  47 #define RUN7_VLC_BITS                  6
  48
  49 #define MAX_SPS_COUNT 32
  50 #define MAX_PPS_COUNT 256
  51
  52 #define MAX_MMCO_COUNT 66
  53
  54 /* Compiling in interlaced support reduces the speed
  55  * of progressive decoding by about 2%. */
  56 #define ALLOW_INTERLACE
  57
  58 #ifdef ALLOW_INTERLACE
  59 #define MB_MBAFF h->mb_mbaff
  60 #define MB_FIELD h->mb_field_decoding_flag
  61 #define FRAME_MBAFF h->mb_aff_frame
  62 #define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
  63 #else
  64 #define MB_MBAFF 0
  65 #define MB_FIELD 0
  66 #define FRAME_MBAFF 0
  67 #define FIELD_PICTURE 0
  68 #undef  IS_INTERLACED
  69 #define IS_INTERLACED(mb_type) 0
  70 #endif
  71 #define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
  72
  73 /**
  74  * Sequence parameter set
  75  */
  76 typedef struct SPS{
  77
  78     int profile_idc;
  79     int level_idc;
  80     int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
  81     int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
  82     int poc_type;                      ///< pic_order_cnt_type
  83     int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
  84     int delta_pic_order_always_zero_flag;
  85     int offset_for_non_ref_pic;
  86     int offset_for_top_to_bottom_field;
  87     int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
  88     int ref_frame_count;               ///< num_ref_frames
  89     int gaps_in_frame_num_allowed_flag;
  90     int mb_width;                      ///< pic_width_in_mbs_minus1 + 1
  91     int mb_height;                     ///< pic_height_in_map_units_minus1 + 1
  92     int frame_mbs_only_flag;
  93     int mb_aff;                        ///<mb_adaptive_frame_field_flag
  94     int direct_8x8_inference_flag;
  95     int crop;                   ///< frame_cropping_flag
  96     int crop_left;              ///< frame_cropping_rect_left_offset
  97     int crop_right;             ///< frame_cropping_rect_right_offset
  98     int crop_top;               ///< frame_cropping_rect_top_offset
  99     int crop_bottom;            ///< frame_cropping_rect_bottom_offset
 100     int vui_parameters_present_flag;
 101     AVRational sar;
 102     int timing_info_present_flag;
 103     uint32_t num_units_in_tick;
 104     uint32_t time_scale;
 105     int fixed_frame_rate_flag;
 106     short offset_for_ref_frame[256]; //FIXME dyn aloc?
 107     int bitstream_restriction_flag;
 108     int num_reorder_frames;
 109     int scaling_matrix_present;
 110     uint8_t scaling_matrix4[6][16];
 111     uint8_t scaling_matrix8[2][64];
 112 }SPS;
 113
 114 /**
 115  * Picture parameter set
 116  */
 117 typedef struct PPS{
 118     unsigned int sps_id;
 119     int cabac;                  ///< entropy_coding_mode_flag
 120     int pic_order_present;      ///< pic_order_present_flag
 121     int slice_group_count;      ///< num_slice_groups_minus1 + 1
 122     int mb_slice_group_map_type;
 123     unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
 124     int weighted_pred;          ///< weighted_pred_flag
 125     int weighted_bipred_idc;
 126     int init_qp;                ///< pic_init_qp_minus26 + 26
 127     int init_qs;                ///< pic_init_qs_minus26 + 26
 128     int chroma_qp_index_offset[2];
 129     int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
 130     int constrained_intra_pred; ///< constrained_intra_pred_flag
 131     int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
 132     int transform_8x8_mode;     ///< transform_8x8_mode_flag
 133     uint8_t scaling_matrix4[6][16];
 134     uint8_t scaling_matrix8[2][64];
 135     uint8_t chroma_qp_table[2][256];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
 136     int chroma_qp_diff;
 137 }PPS;
 138
 139 /**
 140  * Memory management control operation opcode.
 141  */
 142 typedef enum MMCOOpcode{
 143     MMCO_END=0,
 144     MMCO_SHORT2UNUSED,
 145     MMCO_LONG2UNUSED,
 146     MMCO_SHORT2LONG,
 147     MMCO_SET_MAX_LONG,
 148     MMCO_RESET,
 149     MMCO_LONG,
 150 } MMCOOpcode;
 151
 152 /**
 153  * Memory management control operation.
 154  */
 155 typedef struct MMCO{
 156     MMCOOpcode opcode;
 157     int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)
 158     int long_arg;       ///< index, pic_num, or num long refs depending on opcode
 159 } MMCO;
 160
 161 /**
 162  * H264Context
 163  */
 164 typedef struct H264Context{
 165     MpegEncContext s;
 166     int nal_ref_idc;
 167     int nal_unit_type;
 168     uint8_t *rbsp_buffer[2];
 169     unsigned int rbsp_buffer_size[2];
 170
 171     /**
 172       * Used to parse AVC variant of h264
 173       */
 174     int is_avc; ///< this flag is != 0 if codec is avc1
 175     int got_avcC; ///< flag used to parse avcC data only once
 176     int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
 177
 178     int chroma_qp[2]; //QPc
 179
 180     int prev_mb_skipped;
 181     int next_mb_skipped;
 182
 183     //prediction stuff
 184     int chroma_pred_mode;
 185     int intra16x16_pred_mode;
 186
 187     int top_mb_xy;
 188     int left_mb_xy[2];
 189
 190     int8_t intra4x4_pred_mode_cache[5*8];
 191     int8_t (*intra4x4_pred_mode)[8];
 192     H264PredContext hpc;
 193     unsigned int topleft_samples_available;
 194     unsigned int top_samples_available;
 195     unsigned int topright_samples_available;
 196     unsigned int left_samples_available;
 197     uint8_t (*top_borders[2])[16+2*8];
 198     uint8_t left_border[2*(17+2*9)];
 199
 200     /**
 201      * non zero coeff count cache.
 202      * is 64 if not available.
 203      */
 204     DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
 205     uint8_t (*non_zero_count)[16];
 206
 207     /**
 208      * Motion vector cache.
 209      */
 210     DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
 211     DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
 212 #define LIST_NOT_USED -1 //FIXME rename?
 213 #define PART_NOT_AVAILABLE -2
 214
 215     /**
 216      * is 1 if the specific list MV&references are set to 0,0,-2.
 217      */
 218     int mv_cache_clean[2];
 219
 220     /**
 221      * number of neighbors (top and/or left) that used 8x8 dct
 222      */
 223     int neighbor_transform_size;
 224
 225     /**
 226      * block_offset[ 0..23] for frame macroblocks
 227      * block_offset[24..47] for field macroblocks
 228      */
 229     int block_offset[2*(16+8)];
 230
 231     uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
 232     uint32_t *mb2b8_xy;
 233     int b_stride; //FIXME use s->b4_stride
 234     int b8_stride;
 235
 236     int mb_linesize;   ///< may be equal to s->linesize or s->linesize*2, for mbaff
 237     int mb_uvlinesize;
 238
 239     int emu_edge_width;
 240     int emu_edge_height;
 241
 242     int halfpel_flag;
 243     int thirdpel_flag;
 244
 245     int unknown_svq3_flag;
 246     int next_slice_index;
 247
 248     SPS *sps_buffers[MAX_SPS_COUNT];
 249     SPS sps; ///< current sps
 250
 251     PPS *pps_buffers[MAX_PPS_COUNT];
 252     /**
 253      * current pps
 254      */
 255     PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
 256
 257     uint32_t dequant4_buffer[6][52][16];
 258     uint32_t dequant8_buffer[2][52][64];
 259     uint32_t (*dequant4_coeff[6])[16];
 260     uint32_t (*dequant8_coeff[2])[64];
 261     int dequant_coeff_pps;     ///< reinit tables when pps changes
 262
 263     int slice_num;
 264     uint8_t *slice_table_base;
 265     uint8_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1
 266     int slice_type;
 267     int slice_type_fixed;
 268
 269     //interlacing specific flags
 270     int mb_aff_frame;
 271     int mb_field_decoding_flag;
 272     int mb_mbaff;              ///< mb_aff_frame && mb_field_decoding_flag
 273
 274     unsigned int sub_mb_type[4];
 275
 276     //POC stuff
 277     int poc_lsb;
 278     int poc_msb;
 279     int delta_poc_bottom;
 280     int delta_poc[2];
 281     int frame_num;
 282     int prev_poc_msb;             ///< poc_msb of the last reference pic for POC type 0
 283     int prev_poc_lsb;             ///< poc_lsb of the last reference pic for POC type 0
 284     int frame_num_offset;         ///< for POC type 2
 285     int prev_frame_num_offset;    ///< for POC type 2
 286     int prev_frame_num;           ///< frame_num of the last pic for POC type 1/2
 287
 288     /**
 289      * frame_num for frames or 2*frame_num+1 for field pics.
 290      */
 291     int curr_pic_num;
 292
 293     /**
 294      * max_frame_num or 2*max_frame_num for field pics.
 295      */
 296     int max_pic_num;
 297
 298     //Weighted pred stuff
 299     int use_weight;
 300     int use_weight_chroma;
 301     int luma_log2_weight_denom;
 302     int chroma_log2_weight_denom;
 303     int luma_weight[2][48];
 304     int luma_offset[2][48];
 305     int chroma_weight[2][48][2];
 306     int chroma_offset[2][48][2];
 307     int implicit_weight[48][48];
 308
 309     //deblock
 310     int deblocking_filter;         ///< disable_deblocking_filter_idc with 1<->0
 311     int slice_alpha_c0_offset;
 312     int slice_beta_offset;
 313
 314     int redundant_pic_count;
 315
 316     int direct_spatial_mv_pred;
 317     int dist_scale_factor[16];
 318     int dist_scale_factor_field[32];
 319     int map_col_to_list0[2][16];
 320     int map_col_to_list0_field[2][32];
 321
 322     /**
 323      * num_ref_idx_l0/1_active_minus1 + 1
 324      */
 325     unsigned int ref_count[2];   ///< counts frames or fields, depending on current mb mode
 326     unsigned int list_count;
 327     Picture *short_ref[32];
 328     Picture *long_ref[32];
 329     Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
 330     Picture ref_list[2][48];         /**< 0..15: frame refs, 16..47: mbaff field refs.
 331                                           Reordered version of default_ref_list
 332                                           according to picture reordering in slice header */
 333     Picture *delayed_pic[18]; //FIXME size?
 334     Picture *delayed_output_pic;
 335
 336     /**
 337      * memory management control operations buffer.
 338      */
 339     MMCO mmco[MAX_MMCO_COUNT];
 340     int mmco_index;
 341
 342     int long_ref_count;  ///< number of actual long term references
 343     int short_ref_count; ///< number of actual short term references
 344
 345     //data partitioning
 346     GetBitContext intra_gb;
 347     GetBitContext inter_gb;
 348     GetBitContext *intra_gb_ptr;
 349     GetBitContext *inter_gb_ptr;
 350
 351     DECLARE_ALIGNED_8(DCTELEM, mb[16*24]);
 352     DCTELEM mb_padding[256];        ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not to large or ensure that there is some unused stuff after mb
 353
 354     /**
 355      * Cabac
 356      */
 357     CABACContext cabac;
 358     uint8_t      cabac_state[460];
 359     int          cabac_init_idc;
 360
 361     /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
 362     uint16_t     *cbp_table;
 363     int cbp;
 364     int top_cbp;
 365     int left_cbp;
 366     /* chroma_pred_mode for i4x4 or i16x16, else 0 */
 367     uint8_t     *chroma_pred_mode_table;
 368     int         last_qscale_diff;
 369     int16_t     (*mvd_table[2])[2];
 370     DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
 371     uint8_t     *direct_table;
 372     uint8_t     direct_cache[5*8];
 373
 374     uint8_t zigzag_scan[16];
 375     uint8_t zigzag_scan8x8[64];
 376     uint8_t zigzag_scan8x8_cavlc[64];
 377     uint8_t field_scan[16];
 378     uint8_t field_scan8x8[64];
 379     uint8_t field_scan8x8_cavlc[64];
 380     const uint8_t *zigzag_scan_q0;
 381     const uint8_t *zigzag_scan8x8_q0;
 382     const uint8_t *zigzag_scan8x8_cavlc_q0;
 383     const uint8_t *field_scan_q0;
 384     const uint8_t *field_scan8x8_q0;
 385     const uint8_t *field_scan8x8_cavlc_q0;
 386
 387     int x264_build;
 388
 389     /**
 390      * @defgroup multithreading Members for slice based multithreading
 391      * @{
 392      */
 393     struct H264Context *thread_context[MAX_THREADS];
 394
 395     /**
 396      * current slice number, used to initalize slice_num of each thread/context
 397      */
 398     int current_slice;
 399
 400     /**
 401      * Max number of threads / contexts.
 402      * This is equal to AVCodecContext.thread_count unless
 403      * multithreaded decoding is impossible, in which case it is
 404      * reduced to 1.
 405      */
 406     int max_contexts;
 407
 408     /**
 409      *  1 if the single thread fallback warning has already been
 410      *  displayed, 0 otherwise.
 411      */
 412     int single_decode_warning;
 413
 414     int last_slice_type;
 415     /** @} */
 416
 417 }H264Context;
 418
 419 #endif /* FFMPEG_H264_H */