git.sesse.net Git - ffmpeg/blob - 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 libavcodec/h264.h
  24  * H.264 / AVC / MPEG4 part10 codec.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #ifndef AVCODEC_H264_H
  29 #define AVCODEC_H264_H
  30
  31 #include "dsputil.h"
  32 #include "cabac.h"
  33 #include "mpegvideo.h"
  34 #include "h264pred.h"
  35 #include "rectangle.h"
  36
  37 #define interlaced_dct interlaced_dct_is_a_bad_name
  38 #define mb_intra mb_intra_is_not_initialized_see_mb_type
  39
  40 #define LUMA_DC_BLOCK_INDEX   25
  41 #define CHROMA_DC_BLOCK_INDEX 26
  42
  43 #define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
  44 #define COEFF_TOKEN_VLC_BITS           8
  45 #define TOTAL_ZEROS_VLC_BITS           9
  46 #define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
  47 #define RUN_VLC_BITS                   3
  48 #define RUN7_VLC_BITS                  6
  49
  50 #define MAX_SPS_COUNT 32
  51 #define MAX_PPS_COUNT 256
  52
  53 #define MAX_MMCO_COUNT 66
  54
  55 #define MAX_DELAYED_PIC_COUNT 16
  56
  57 /* Compiling in interlaced support reduces the speed
  58  * of progressive decoding by about 2%. */
  59 #define ALLOW_INTERLACE
  60
  61 #define ALLOW_NOCHROMA
  62
  63 /**
  64  * The maximum number of slices supported by the decoder.
  65  * must be a power of 2
  66  */
  67 #define MAX_SLICES 16
  68
  69 #ifdef ALLOW_INTERLACE
  70 #define MB_MBAFF h->mb_mbaff
  71 #define MB_FIELD h->mb_field_decoding_flag
  72 #define FRAME_MBAFF h->mb_aff_frame
  73 #define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
  74 #else
  75 #define MB_MBAFF 0
  76 #define MB_FIELD 0
  77 #define FRAME_MBAFF 0
  78 #define FIELD_PICTURE 0
  79 #undef  IS_INTERLACED
  80 #define IS_INTERLACED(mb_type) 0
  81 #endif
  82 #define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
  83
  84 #ifdef ALLOW_NOCHROMA
  85 #define CHROMA h->sps.chroma_format_idc
  86 #else
  87 #define CHROMA 1
  88 #endif
  89
  90 #ifndef CABAC
  91 #define CABAC h->pps.cabac
  92 #endif
  93
  94 #define EXTENDED_SAR          255
  95
  96 #define MB_TYPE_REF0       MB_TYPE_ACPRED //dirty but it fits in 16 bit
  97 #define MB_TYPE_8x8DCT     0x01000000
  98 #define IS_REF0(a)         ((a) & MB_TYPE_REF0)
  99 #define IS_8x8DCT(a)       ((a) & MB_TYPE_8x8DCT)
 100
 101 /**
 102  * Value of Picture.reference when Picture is not a reference picture, but
 103  * is held for delayed output.
 104  */
 105 #define DELAYED_PIC_REF 4
 106
 107
 108 /* NAL unit types */
 109 enum {
 110     NAL_SLICE=1,
 111     NAL_DPA,
 112     NAL_DPB,
 113     NAL_DPC,
 114     NAL_IDR_SLICE,
 115     NAL_SEI,
 116     NAL_SPS,
 117     NAL_PPS,
 118     NAL_AUD,
 119     NAL_END_SEQUENCE,
 120     NAL_END_STREAM,
 121     NAL_FILLER_DATA,
 122     NAL_SPS_EXT,
 123     NAL_AUXILIARY_SLICE=19
 124 };
 125
 126 /**
 127  * SEI message types
 128  */
 129 typedef enum {
 130     SEI_BUFFERING_PERIOD             =  0, ///< buffering period (H.264, D.1.1)
 131     SEI_TYPE_PIC_TIMING              =  1, ///< picture timing
 132     SEI_TYPE_USER_DATA_UNREGISTERED  =  5, ///< unregistered user data
 133     SEI_TYPE_RECOVERY_POINT          =  6  ///< recovery point (frame # to decoder sync)
 134 } SEI_Type;
 135
 136 /**
 137  * pic_struct in picture timing SEI message
 138  */
 139 typedef enum {
 140     SEI_PIC_STRUCT_FRAME             = 0, ///<  0: %frame
 141     SEI_PIC_STRUCT_TOP_FIELD         = 1, ///<  1: top field
 142     SEI_PIC_STRUCT_BOTTOM_FIELD      = 2, ///<  2: bottom field
 143     SEI_PIC_STRUCT_TOP_BOTTOM        = 3, ///<  3: top field, bottom field, in that order
 144     SEI_PIC_STRUCT_BOTTOM_TOP        = 4, ///<  4: bottom field, top field, in that order
 145     SEI_PIC_STRUCT_TOP_BOTTOM_TOP    = 5, ///<  5: top field, bottom field, top field repeated, in that order
 146     SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///<  6: bottom field, top field, bottom field repeated, in that order
 147     SEI_PIC_STRUCT_FRAME_DOUBLING    = 7, ///<  7: %frame doubling
 148     SEI_PIC_STRUCT_FRAME_TRIPLING    = 8  ///<  8: %frame tripling
 149 } SEI_PicStructType;
 150
 151 /**
 152  * Sequence parameter set
 153  */
 154 typedef struct SPS{
 155
 156     int profile_idc;
 157     int level_idc;
 158     int chroma_format_idc;
 159     int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
 160     int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
 161     int poc_type;                      ///< pic_order_cnt_type
 162     int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
 163     int delta_pic_order_always_zero_flag;
 164     int offset_for_non_ref_pic;
 165     int offset_for_top_to_bottom_field;
 166     int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
 167     int ref_frame_count;               ///< num_ref_frames
 168     int gaps_in_frame_num_allowed_flag;
 169     int mb_width;                      ///< pic_width_in_mbs_minus1 + 1
 170     int mb_height;                     ///< pic_height_in_map_units_minus1 + 1
 171     int frame_mbs_only_flag;
 172     int mb_aff;                        ///<mb_adaptive_frame_field_flag
 173     int direct_8x8_inference_flag;
 174     int crop;                   ///< frame_cropping_flag
 175     unsigned int crop_left;            ///< frame_cropping_rect_left_offset
 176     unsigned int crop_right;           ///< frame_cropping_rect_right_offset
 177     unsigned int crop_top;             ///< frame_cropping_rect_top_offset
 178     unsigned int crop_bottom;          ///< frame_cropping_rect_bottom_offset
 179     int vui_parameters_present_flag;
 180     AVRational sar;
 181     int video_signal_type_present_flag;
 182     int full_range;
 183     int colour_description_present_flag;
 184     enum AVColorPrimaries color_primaries;
 185     enum AVColorTransferCharacteristic color_trc;
 186     enum AVColorSpace colorspace;
 187     int timing_info_present_flag;
 188     uint32_t num_units_in_tick;
 189     uint32_t time_scale;
 190     int fixed_frame_rate_flag;
 191     short offset_for_ref_frame[256]; //FIXME dyn aloc?
 192     int bitstream_restriction_flag;
 193     int num_reorder_frames;
 194     int scaling_matrix_present;
 195     uint8_t scaling_matrix4[6][16];
 196     uint8_t scaling_matrix8[2][64];
 197     int nal_hrd_parameters_present_flag;
 198     int vcl_hrd_parameters_present_flag;
 199     int pic_struct_present_flag;
 200     int time_offset_length;
 201     int cpb_cnt;                       ///< See H.264 E.1.2
 202     int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 +1
 203     int cpb_removal_delay_length;      ///< cpb_removal_delay_length_minus1 + 1
 204     int dpb_output_delay_length;       ///< dpb_output_delay_length_minus1 + 1
 205     int bit_depth_luma;                ///< bit_depth_luma_minus8 + 8
 206     int bit_depth_chroma;              ///< bit_depth_chroma_minus8 + 8
 207     int residual_color_transform_flag; ///< residual_colour_transform_flag
 208 }SPS;
 209
 210 /**
 211  * Picture parameter set
 212  */
 213 typedef struct PPS{
 214     unsigned int sps_id;
 215     int cabac;                  ///< entropy_coding_mode_flag
 216     int pic_order_present;      ///< pic_order_present_flag
 217     int slice_group_count;      ///< num_slice_groups_minus1 + 1
 218     int mb_slice_group_map_type;
 219     unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
 220     int weighted_pred;          ///< weighted_pred_flag
 221     int weighted_bipred_idc;
 222     int init_qp;                ///< pic_init_qp_minus26 + 26
 223     int init_qs;                ///< pic_init_qs_minus26 + 26
 224     int chroma_qp_index_offset[2];
 225     int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
 226     int constrained_intra_pred; ///< constrained_intra_pred_flag
 227     int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
 228     int transform_8x8_mode;     ///< transform_8x8_mode_flag
 229     uint8_t scaling_matrix4[6][16];
 230     uint8_t scaling_matrix8[2][64];
 231     uint8_t chroma_qp_table[2][64];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
 232     int chroma_qp_diff;
 233 }PPS;
 234
 235 /**
 236  * Memory management control operation opcode.
 237  */
 238 typedef enum MMCOOpcode{
 239     MMCO_END=0,
 240     MMCO_SHORT2UNUSED,
 241     MMCO_LONG2UNUSED,
 242     MMCO_SHORT2LONG,
 243     MMCO_SET_MAX_LONG,
 244     MMCO_RESET,
 245     MMCO_LONG,
 246 } MMCOOpcode;
 247
 248 /**
 249  * Memory management control operation.
 250  */
 251 typedef struct MMCO{
 252     MMCOOpcode opcode;
 253     int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)
 254     int long_arg;       ///< index, pic_num, or num long refs depending on opcode
 255 } MMCO;
 256
 257 /**
 258  * H264Context
 259  */
 260 typedef struct H264Context{
 261     MpegEncContext s;
 262     int nal_ref_idc;
 263     int nal_unit_type;
 264     uint8_t *rbsp_buffer[2];
 265     unsigned int rbsp_buffer_size[2];
 266
 267     /**
 268       * Used to parse AVC variant of h264
 269       */
 270     int is_avc; ///< this flag is != 0 if codec is avc1
 271     int got_avcC; ///< flag used to parse avcC data only once
 272     int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
 273
 274     int chroma_qp[2]; //QPc
 275
 276     int qp_thresh;      ///< QP threshold to skip loopfilter
 277
 278     int prev_mb_skipped;
 279     int next_mb_skipped;
 280
 281     //prediction stuff
 282     int chroma_pred_mode;
 283     int intra16x16_pred_mode;
 284
 285     int top_mb_xy;
 286     int left_mb_xy[2];
 287
 288     int8_t intra4x4_pred_mode_cache[5*8];
 289     int8_t (*intra4x4_pred_mode)[8];
 290     H264PredContext hpc;
 291     unsigned int topleft_samples_available;
 292     unsigned int top_samples_available;
 293     unsigned int topright_samples_available;
 294     unsigned int left_samples_available;
 295     uint8_t (*top_borders[2])[16+2*8];
 296     uint8_t left_border[2*(17+2*9)];
 297
 298     /**
 299      * non zero coeff count cache.
 300      * is 64 if not available.
 301      */
 302     DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache)[6*8];
 303
 304     /*
 305     .UU.YYYY
 306     .UU.YYYY
 307     .vv.YYYY
 308     .VV.YYYY
 309     */
 310     uint8_t (*non_zero_count)[32];
 311
 312     /**
 313      * Motion vector cache.
 314      */
 315     DECLARE_ALIGNED_16(int16_t, mv_cache)[2][5*8][2];
 316     DECLARE_ALIGNED_8(int8_t, ref_cache)[2][5*8];
 317 #define LIST_NOT_USED -1 //FIXME rename?
 318 #define PART_NOT_AVAILABLE -2
 319
 320     /**
 321      * is 1 if the specific list MV&references are set to 0,0,-2.
 322      */
 323     int mv_cache_clean[2];
 324
 325     /**
 326      * number of neighbors (top and/or left) that used 8x8 dct
 327      */
 328     int neighbor_transform_size;
 329
 330     /**
 331      * block_offset[ 0..23] for frame macroblocks
 332      * block_offset[24..47] for field macroblocks
 333      */
 334     int block_offset[2*(16+8)];
 335
 336     uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
 337     uint32_t *mb2b8_xy;
 338     int b_stride; //FIXME use s->b4_stride
 339     int b8_stride;
 340
 341     int mb_linesize;   ///< may be equal to s->linesize or s->linesize*2, for mbaff
 342     int mb_uvlinesize;
 343
 344     int emu_edge_width;
 345     int emu_edge_height;
 346
 347     int halfpel_flag;
 348     int thirdpel_flag;
 349
 350     int unknown_svq3_flag;
 351     int next_slice_index;
 352
 353     SPS *sps_buffers[MAX_SPS_COUNT];
 354     SPS sps; ///< current sps
 355
 356     PPS *pps_buffers[MAX_PPS_COUNT];
 357     /**
 358      * current pps
 359      */
 360     PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
 361
 362     uint32_t dequant4_buffer[6][52][16];
 363     uint32_t dequant8_buffer[2][52][64];
 364     uint32_t (*dequant4_coeff[6])[16];
 365     uint32_t (*dequant8_coeff[2])[64];
 366     int dequant_coeff_pps;     ///< reinit tables when pps changes
 367
 368     int slice_num;
 369     uint16_t *slice_table_base;
 370     uint16_t *slice_table;     ///< slice_table_base + 2*mb_stride + 1
 371     int slice_type;
 372     int slice_type_nos;        ///< S free slice type (SI/SP are remapped to I/P)
 373     int slice_type_fixed;
 374
 375     //interlacing specific flags
 376     int mb_aff_frame;
 377     int mb_field_decoding_flag;
 378     int mb_mbaff;              ///< mb_aff_frame && mb_field_decoding_flag
 379
 380     DECLARE_ALIGNED_8(uint16_t, sub_mb_type)[4];
 381
 382     //POC stuff
 383     int poc_lsb;
 384     int poc_msb;
 385     int delta_poc_bottom;
 386     int delta_poc[2];
 387     int frame_num;
 388     int prev_poc_msb;             ///< poc_msb of the last reference pic for POC type 0
 389     int prev_poc_lsb;             ///< poc_lsb of the last reference pic for POC type 0
 390     int frame_num_offset;         ///< for POC type 2
 391     int prev_frame_num_offset;    ///< for POC type 2
 392     int prev_frame_num;           ///< frame_num of the last pic for POC type 1/2
 393
 394     /**
 395      * frame_num for frames or 2*frame_num+1 for field pics.
 396      */
 397     int curr_pic_num;
 398
 399     /**
 400      * max_frame_num or 2*max_frame_num for field pics.
 401      */
 402     int max_pic_num;
 403
 404     //Weighted pred stuff
 405     int use_weight;
 406     int use_weight_chroma;
 407     int luma_log2_weight_denom;
 408     int chroma_log2_weight_denom;
 409     int luma_weight[2][48];
 410     int luma_offset[2][48];
 411     int chroma_weight[2][48][2];
 412     int chroma_offset[2][48][2];
 413     int implicit_weight[48][48];
 414
 415     //deblock
 416     int deblocking_filter;         ///< disable_deblocking_filter_idc with 1<->0
 417     int slice_alpha_c0_offset;
 418     int slice_beta_offset;
 419
 420     int redundant_pic_count;
 421
 422     int direct_spatial_mv_pred;
 423     int dist_scale_factor[16];
 424     int dist_scale_factor_field[2][32];
 425     int map_col_to_list0[2][16+32];
 426     int map_col_to_list0_field[2][2][16+32];
 427
 428     /**
 429      * num_ref_idx_l0/1_active_minus1 + 1
 430      */
 431     unsigned int ref_count[2];   ///< counts frames or fields, depending on current mb mode
 432     unsigned int list_count;
 433     uint8_t *list_counts;            ///< Array of list_count per MB specifying the slice type
 434     Picture *short_ref[32];
 435     Picture *long_ref[32];
 436     Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
 437     Picture ref_list[2][48];         /**< 0..15: frame refs, 16..47: mbaff field refs.
 438                                           Reordered version of default_ref_list
 439                                           according to picture reordering in slice header */
 440     int ref2frm[MAX_SLICES][2][64];  ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
 441     Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
 442     int outputed_poc;
 443
 444     /**
 445      * memory management control operations buffer.
 446      */
 447     MMCO mmco[MAX_MMCO_COUNT];
 448     int mmco_index;
 449
 450     int long_ref_count;  ///< number of actual long term references
 451     int short_ref_count; ///< number of actual short term references
 452
 453     //data partitioning
 454     GetBitContext intra_gb;
 455     GetBitContext inter_gb;
 456     GetBitContext *intra_gb_ptr;
 457     GetBitContext *inter_gb_ptr;
 458
 459     DECLARE_ALIGNED_16(DCTELEM, mb)[16*24];
 460     DCTELEM mb_padding[256];        ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not too large or ensure that there is some unused stuff after mb
 461
 462     /**
 463      * Cabac
 464      */
 465     CABACContext cabac;
 466     uint8_t      cabac_state[460];
 467     int          cabac_init_idc;
 468
 469     /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
 470     uint16_t     *cbp_table;
 471     int cbp;
 472     int top_cbp;
 473     int left_cbp;
 474     /* chroma_pred_mode for i4x4 or i16x16, else 0 */
 475     uint8_t     *chroma_pred_mode_table;
 476     int         last_qscale_diff;
 477     int16_t     (*mvd_table[2])[2];
 478     DECLARE_ALIGNED_16(int16_t, mvd_cache)[2][5*8][2];
 479     uint8_t     *direct_table;
 480     uint8_t     direct_cache[5*8];
 481
 482     uint8_t zigzag_scan[16];
 483     uint8_t zigzag_scan8x8[64];
 484     uint8_t zigzag_scan8x8_cavlc[64];
 485     uint8_t field_scan[16];
 486     uint8_t field_scan8x8[64];
 487     uint8_t field_scan8x8_cavlc[64];
 488     const uint8_t *zigzag_scan_q0;
 489     const uint8_t *zigzag_scan8x8_q0;
 490     const uint8_t *zigzag_scan8x8_cavlc_q0;
 491     const uint8_t *field_scan_q0;
 492     const uint8_t *field_scan8x8_q0;
 493     const uint8_t *field_scan8x8_cavlc_q0;
 494
 495     int x264_build;
 496
 497     /**
 498      * @defgroup multithreading Members for slice based multithreading
 499      * @{
 500      */
 501     struct H264Context *thread_context[MAX_THREADS];
 502
 503     /**
 504      * current slice number, used to initalize slice_num of each thread/context
 505      */
 506     int current_slice;
 507
 508     /**
 509      * Max number of threads / contexts.
 510      * This is equal to AVCodecContext.thread_count unless
 511      * multithreaded decoding is impossible, in which case it is
 512      * reduced to 1.
 513      */
 514     int max_contexts;
 515
 516     /**
 517      *  1 if the single thread fallback warning has already been
 518      *  displayed, 0 otherwise.
 519      */
 520     int single_decode_warning;
 521
 522     int last_slice_type;
 523     /** @} */
 524
 525     int mb_xy;
 526
 527     uint32_t svq3_watermark_key;
 528
 529     /**
 530      * pic_struct in picture timing SEI message
 531      */
 532     SEI_PicStructType sei_pic_struct;
 533
 534     /**
 535      * Complement sei_pic_struct
 536      * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
 537      * However, soft telecined frames may have these values.
 538      * This is used in an attempt to flag soft telecine progressive.
 539      */
 540     int prev_interlaced_frame;
 541
 542     /**
 543      * Bit set of clock types for fields/frames in picture timing SEI message.
 544      * For each found ct_type, appropriate bit is set (e.g., bit 1 for
 545      * interlaced).
 546      */
 547     int sei_ct_type;
 548
 549     /**
 550      * dpb_output_delay in picture timing SEI message, see H.264 C.2.2
 551      */
 552     int sei_dpb_output_delay;
 553
 554     /**
 555      * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
 556      */
 557     int sei_cpb_removal_delay;
 558
 559     /**
 560      * recovery_frame_cnt from SEI message
 561      *
 562      * Set to -1 if no recovery point SEI message found or to number of frames
 563      * before playback synchronizes. Frames having recovery point are key
 564      * frames.
 565      */
 566     int sei_recovery_frame_cnt;
 567
 568     int is_complex;
 569
 570     int luma_weight_flag[2];   ///< 7.4.3.2 luma_weight_lX_flag
 571     int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
 572
 573     // Timestamp stuff
 574     int sei_buffering_period_present;  ///< Buffering period SEI flag
 575     int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
 576 }H264Context;
 577
 578
 579 extern const uint8_t ff_h264_chroma_qp[52];
 580
 581
 582 /**
 583  * Decode SEI
 584  */
 585 int ff_h264_decode_sei(H264Context *h);
 586
 587 /**
 588  * Decode SPS
 589  */
 590 int ff_h264_decode_seq_parameter_set(H264Context *h);
 591
 592 /**
 593  * Decode PPS
 594  */
 595 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
 596
 597 /**
 598  * Decodes a network abstraction layer unit.
 599  * @param consumed is the number of bytes used as input
 600  * @param length is the length of the array
 601  * @param dst_length is the number of decoded bytes FIXME here or a decode rbsp tailing?
 602  * @returns decoded bytes, might be src+1 if no escapes
 603  */
 604 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length);
 605
 606 /**
 607  * identifies the exact end of the bitstream
 608  * @return the length of the trailing, or 0 if damaged
 609  */
 610 int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src);
 611
 612 /**
 613  * frees any data that may have been allocated in the H264 context like SPS, PPS etc.
 614  */
 615 av_cold void ff_h264_free_context(H264Context *h);
 616
 617 /**
 618  * reconstructs bitstream slice_type.
 619  */
 620 int ff_h264_get_slice_type(const H264Context *h);
 621
 622 /**
 623  * allocates tables.
 624  * needs width/height
 625  */
 626 int ff_h264_alloc_tables(H264Context *h);
 627
 628 /**
 629  * fills the default_ref_list.
 630  */
 631 int ff_h264_fill_default_ref_list(H264Context *h);
 632
 633 int ff_h264_decode_ref_pic_list_reordering(H264Context *h);
 634 void ff_h264_fill_mbaff_ref_list(H264Context *h);
 635 void ff_h264_remove_all_refs(H264Context *h);
 636
 637 /**
 638  * Executes the reference picture marking (memory management control operations).
 639  */
 640 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count);
 641
 642 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb);
 643
 644
 645 /**
 646  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
 647  */
 648 int ff_h264_check_intra4x4_pred_mode(H264Context *h);
 649
 650 /**
 651  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
 652  */
 653 int ff_h264_check_intra_pred_mode(H264Context *h, int mode);
 654
 655 void ff_h264_write_back_intra_pred_mode(H264Context *h);
 656 void ff_h264_hl_decode_mb(H264Context *h);
 657 int ff_h264_frame_start(H264Context *h);
 658 av_cold int ff_h264_decode_init(AVCodecContext *avctx);
 659 av_cold int ff_h264_decode_end(AVCodecContext *avctx);
 660 av_cold void ff_h264_decode_init_vlc(void);
 661
 662 /**
 663  * decodes a macroblock
 664  * @returns 0 if OK, AC_ERROR / DC_ERROR / MV_ERROR if an error is noticed
 665  */
 666 int ff_h264_decode_mb_cavlc(H264Context *h);
 667
 668 /**
 669  * decodes a CABAC coded macroblock
 670  * @returns 0 if OK, AC_ERROR / DC_ERROR / MV_ERROR if an error is noticed
 671  */
 672 int ff_h264_decode_mb_cabac(H264Context *h);
 673
 674 void ff_h264_init_cabac_states(H264Context *h);
 675
 676 void ff_h264_direct_dist_scale_factor(H264Context * const h);
 677 void ff_h264_direct_ref_list_init(H264Context * const h);
 678 void ff_h264_pred_direct_motion(H264Context * const h, int *mb_type);
 679
 680 void ff_h264_filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);
 681 void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);
 682
 683 /**
 684  * Reset SEI values at the beginning of the frame.
 685  *
 686  * @param h H.264 context.
 687  */
 688 void ff_h264_reset_sei(H264Context *h);
 689
 690
 691 /*
 692 o-o o-o
 693  / / /
 694 o-o o-o
 695  ,---'
 696 o-o o-o
 697  / / /
 698 o-o o-o
 699 */
 700 //This table must be here because scan8[constant] must be known at compiletime
 701 static const uint8_t scan8[16 + 2*4]={
 702  4+1*8, 5+1*8, 4+2*8, 5+2*8,
 703  6+1*8, 7+1*8, 6+2*8, 7+2*8,
 704  4+3*8, 5+3*8, 4+4*8, 5+4*8,
 705  6+3*8, 7+3*8, 6+4*8, 7+4*8,
 706  1+1*8, 2+1*8,
 707  1+2*8, 2+2*8,
 708  1+4*8, 2+4*8,
 709  1+5*8, 2+5*8,
 710 };
 711
 712 static av_always_inline uint32_t pack16to32(int a, int b){
 713 #if HAVE_BIGENDIAN
 714    return (b&0xFFFF) + (a<<16);
 715 #else
 716    return (a&0xFFFF) + (b<<16);
 717 #endif
 718 }
 719
 720 /**
 721  * gets the chroma qp.
 722  */
 723 static inline int get_chroma_qp(H264Context *h, int t, int qscale){
 724     return h->pps.chroma_qp_table[t][qscale];
 725 }
 726
 727 static inline void pred_pskip_motion(H264Context * const h, int * const mx, int * const my);
 728
 729 static av_always_inline int fill_caches(H264Context *h, int mb_type, int for_deblock){
 730     MpegEncContext * const s = &h->s;
 731     const int mb_xy= h->mb_xy;
 732     int topleft_xy, top_xy, topright_xy, left_xy[2];
 733     int topleft_type, top_type, topright_type, left_type[2];
 734     const uint8_t * left_block;
 735     int topleft_partition= -1;
 736     int i;
 737     static const uint8_t left_block_options[4][16]={
 738         {0,1,2,3,7,10,8,11,7+0*8, 7+1*8, 7+2*8, 7+3*8, 2+0*8, 2+3*8, 2+1*8, 2+2*8},
 739         {2,2,3,3,8,11,8,11,7+2*8, 7+2*8, 7+3*8, 7+3*8, 2+1*8, 2+2*8, 2+1*8, 2+2*8},
 740         {0,0,1,1,7,10,7,10,7+0*8, 7+0*8, 7+1*8, 7+1*8, 2+0*8, 2+3*8, 2+0*8, 2+3*8},
 741         {0,2,0,2,7,10,7,10,7+0*8, 7+2*8, 7+0*8, 7+2*8, 2+0*8, 2+3*8, 2+0*8, 2+3*8}
 742     };
 743
 744     top_xy     = mb_xy  - (s->mb_stride << MB_FIELD);
 745
 746     //FIXME deblocking could skip the intra and nnz parts.
 747 //     if(for_deblock && (h->slice_num == 1 || h->slice_table[mb_xy] == h->slice_table[top_xy]) && !FRAME_MBAFF)
 748 //         return;
 749
 750     /* Wow, what a mess, why didn't they simplify the interlacing & intra
 751      * stuff, I can't imagine that these complex rules are worth it. */
 752
 753     topleft_xy = top_xy - 1;
 754     topright_xy= top_xy + 1;
 755     left_xy[1] = left_xy[0] = mb_xy-1;
 756     left_block = left_block_options[0];
 757     if(FRAME_MBAFF){
 758         const int left_mb_field_flag     = IS_INTERLACED(s->current_picture.mb_type[mb_xy-1]);
 759         const int curr_mb_field_flag     = IS_INTERLACED(mb_type);
 760         if(s->mb_y&1){
 761             if (left_mb_field_flag != curr_mb_field_flag) {
 762                 left_xy[1] = left_xy[0] = mb_xy - s->mb_stride - 1;
 763                 if (curr_mb_field_flag) {
 764                     left_xy[1] += s->mb_stride;
 765                     left_block = left_block_options[3];
 766                 } else {
 767                     topleft_xy += s->mb_stride;
 768                     // take top left mv from the middle of the mb, as opposed to all other modes which use the bottom right partition
 769                     topleft_partition = 0;
 770                     left_block = left_block_options[1];
 771                 }
 772             }
 773         }else{
 774             if(curr_mb_field_flag){
 775                 topleft_xy  += s->mb_stride & (((s->current_picture.mb_type[top_xy - 1]>>7)&1)-1);
 776                 topright_xy += s->mb_stride & (((s->current_picture.mb_type[top_xy + 1]>>7)&1)-1);
 777                 top_xy      += s->mb_stride & (((s->current_picture.mb_type[top_xy    ]>>7)&1)-1);
 778             }
 779             if (left_mb_field_flag != curr_mb_field_flag) {
 780                 left_xy[1] = left_xy[0] = mb_xy - 1;
 781                 if (curr_mb_field_flag) {
 782                     left_xy[1] += s->mb_stride;
 783                     left_block = left_block_options[3];
 784                 } else {
 785                     left_block = left_block_options[2];
 786                 }
 787             }
 788         }
 789     }
 790
 791     h->top_mb_xy = top_xy;
 792     h->left_mb_xy[0] = left_xy[0];
 793     h->left_mb_xy[1] = left_xy[1];
 794     if(for_deblock){
 795
 796         //for sufficiently low qp, filtering wouldn't do anything
 797         //this is a conservative estimate: could also check beta_offset and more accurate chroma_qp
 798         int qp_thresh = h->qp_thresh; //FIXME strictly we should store qp_thresh for each mb of a slice
 799         int qp = s->current_picture.qscale_table[mb_xy];
 800         if(qp <= qp_thresh
 801            && (left_xy[0]<0 || ((qp + s->current_picture.qscale_table[left_xy[0]] + 1)>>1) <= qp_thresh)
 802            && (top_xy   < 0 || ((qp + s->current_picture.qscale_table[top_xy ] + 1)>>1) <= qp_thresh)){
 803             if(!FRAME_MBAFF)
 804                 return 1;
 805             if(   (left_xy[0]< 0            || ((qp + s->current_picture.qscale_table[left_xy[0]+s->mb_stride] + 1)>>1) <= qp_thresh)
 806                && (top_xy    < s->mb_stride || ((qp + s->current_picture.qscale_table[top_xy    -s->mb_stride] + 1)>>1) <= qp_thresh))
 807                 return 1;
 808         }
 809         if(IS_INTRA(mb_type))
 810             return 0;
 811
 812         AV_COPY64(&h->non_zero_count_cache[0+8*1], &h->non_zero_count[mb_xy][ 0]);
 813         AV_COPY64(&h->non_zero_count_cache[0+8*2], &h->non_zero_count[mb_xy][ 8]);
 814         *((uint32_t*)&h->non_zero_count_cache[0+8*5])= *((uint32_t*)&h->non_zero_count[mb_xy][16]);
 815         *((uint32_t*)&h->non_zero_count_cache[4+8*3])= *((uint32_t*)&h->non_zero_count[mb_xy][20]);
 816         AV_COPY64(&h->non_zero_count_cache[0+8*4], &h->non_zero_count[mb_xy][24]);
 817
 818         h->cbp= h->cbp_table[mb_xy];
 819
 820         top_type     = h->slice_table[top_xy     ] < 0xFFFF ? s->current_picture.mb_type[top_xy]     : 0;
 821         left_type[0] = h->slice_table[left_xy[0] ] < 0xFFFF ? s->current_picture.mb_type[left_xy[0]] : 0;
 822         left_type[1] = h->slice_table[left_xy[1] ] < 0xFFFF ? s->current_picture.mb_type[left_xy[1]] : 0;
 823
 824         {
 825             int list;
 826             for(list=0; list<h->list_count; list++){
 827                 int8_t *ref;
 828                 int y, b_stride;
 829                 int16_t (*mv_dst)[2];
 830                 int16_t (*mv_src)[2];
 831
 832                 if(!USES_LIST(mb_type, list)){
 833                     fill_rectangle(  h->mv_cache[list][scan8[0]], 4, 4, 8, pack16to32(0,0), 4);
 834                     *(uint32_t*)&h->ref_cache[list][scan8[ 0]] =
 835                     *(uint32_t*)&h->ref_cache[list][scan8[ 2]] =
 836                     *(uint32_t*)&h->ref_cache[list][scan8[ 8]] =
 837                     *(uint32_t*)&h->ref_cache[list][scan8[10]] = ((LIST_NOT_USED)&0xFF)*0x01010101;
 838                     continue;
 839                 }
 840
 841                 ref = &s->current_picture.ref_index[list][h->mb2b8_xy[mb_xy]];
 842                 {
 843                     int (*ref2frm)[64] = h->ref2frm[ h->slice_num&(MAX_SLICES-1) ][0] + (MB_MBAFF ? 20 : 2);
 844                     *(uint32_t*)&h->ref_cache[list][scan8[ 0]] =
 845                     *(uint32_t*)&h->ref_cache[list][scan8[ 2]] = (pack16to32(ref2frm[list][ref[0]],ref2frm[list][ref[1]])&0x00FF00FF)*0x0101;
 846                     ref += h->b8_stride;
 847                     *(uint32_t*)&h->ref_cache[list][scan8[ 8]] =
 848                     *(uint32_t*)&h->ref_cache[list][scan8[10]] = (pack16to32(ref2frm[list][ref[0]],ref2frm[list][ref[1]])&0x00FF00FF)*0x0101;
 849                 }
 850
 851                 b_stride = h->b_stride;
 852                 mv_dst   = &h->mv_cache[list][scan8[0]];
 853                 mv_src   = &s->current_picture.motion_val[list][4*s->mb_x + 4*s->mb_y*b_stride];
 854                 for(y=0; y<4; y++){
 855                     AV_COPY128(mv_dst + 8*y, mv_src + y*b_stride);
 856                 }
 857
 858             }
 859         }
 860     }else{
 861         topleft_type = h->slice_table[topleft_xy ] == h->slice_num ? s->current_picture.mb_type[topleft_xy] : 0;
 862         top_type     = h->slice_table[top_xy     ] == h->slice_num ? s->current_picture.mb_type[top_xy]     : 0;
 863         topright_type= h->slice_table[topright_xy] == h->slice_num ? s->current_picture.mb_type[topright_xy]: 0;
 864         left_type[0] = h->slice_table[left_xy[0] ] == h->slice_num ? s->current_picture.mb_type[left_xy[0]] : 0;
 865         left_type[1] = h->slice_table[left_xy[1] ] == h->slice_num ? s->current_picture.mb_type[left_xy[1]] : 0;
 866
 867         if(IS_INTRA(mb_type)){
 868             int type_mask= h->pps.constrained_intra_pred ? IS_INTRA(-1) : -1;
 869             h->topleft_samples_available=
 870             h->top_samples_available=
 871             h->left_samples_available= 0xFFFF;
 872             h->topright_samples_available= 0xEEEA;
 873
 874             if(!(top_type & type_mask)){
 875                 h->topleft_samples_available= 0xB3FF;
 876                 h->top_samples_available= 0x33FF;
 877                 h->topright_samples_available= 0x26EA;
 878             }
 879             if(IS_INTERLACED(mb_type) != IS_INTERLACED(left_type[0])){
 880                 if(IS_INTERLACED(mb_type)){
 881                     if(!(left_type[0] & type_mask)){
 882                         h->topleft_samples_available&= 0xDFFF;
 883                         h->left_samples_available&= 0x5FFF;
 884                     }
 885                     if(!(left_type[1] & type_mask)){
 886                         h->topleft_samples_available&= 0xFF5F;
 887                         h->left_samples_available&= 0xFF5F;
 888                     }
 889                 }else{
 890                     int left_typei = h->slice_table[left_xy[0] + s->mb_stride ] == h->slice_num
 891                                     ? s->current_picture.mb_type[left_xy[0] + s->mb_stride] : 0;
 892                     assert(left_xy[0] == left_xy[1]);
 893                     if(!((left_typei & type_mask) && (left_type[0] & type_mask))){
 894                         h->topleft_samples_available&= 0xDF5F;
 895                         h->left_samples_available&= 0x5F5F;
 896                     }
 897                 }
 898             }else{
 899                 if(!(left_type[0] & type_mask)){
 900                     h->topleft_samples_available&= 0xDF5F;
 901                     h->left_samples_available&= 0x5F5F;
 902                 }
 903             }
 904
 905             if(!(topleft_type & type_mask))
 906                 h->topleft_samples_available&= 0x7FFF;
 907
 908             if(!(topright_type & type_mask))
 909                 h->topright_samples_available&= 0xFBFF;
 910
 911             if(IS_INTRA4x4(mb_type)){
 912                 if(IS_INTRA4x4(top_type)){
 913                     h->intra4x4_pred_mode_cache[4+8*0]= h->intra4x4_pred_mode[top_xy][4];
 914                     h->intra4x4_pred_mode_cache[5+8*0]= h->intra4x4_pred_mode[top_xy][5];
 915                     h->intra4x4_pred_mode_cache[6+8*0]= h->intra4x4_pred_mode[top_xy][6];
 916                     h->intra4x4_pred_mode_cache[7+8*0]= h->intra4x4_pred_mode[top_xy][3];
 917                 }else{
 918                     int pred;
 919                     if(!(top_type & type_mask))
 920                         pred= -1;
 921                     else{
 922                         pred= 2;
 923                     }
 924                     h->intra4x4_pred_mode_cache[4+8*0]=
 925                     h->intra4x4_pred_mode_cache[5+8*0]=
 926                     h->intra4x4_pred_mode_cache[6+8*0]=
 927                     h->intra4x4_pred_mode_cache[7+8*0]= pred;
 928                 }
 929                 for(i=0; i<2; i++){
 930                     if(IS_INTRA4x4(left_type[i])){
 931                         h->intra4x4_pred_mode_cache[3+8*1 + 2*8*i]= h->intra4x4_pred_mode[left_xy[i]][left_block[0+2*i]];
 932                         h->intra4x4_pred_mode_cache[3+8*2 + 2*8*i]= h->intra4x4_pred_mode[left_xy[i]][left_block[1+2*i]];
 933                     }else{
 934                         int pred;
 935                         if(!(left_type[i] & type_mask))
 936                             pred= -1;
 937                         else{
 938                             pred= 2;
 939                         }
 940                         h->intra4x4_pred_mode_cache[3+8*1 + 2*8*i]=
 941                         h->intra4x4_pred_mode_cache[3+8*2 + 2*8*i]= pred;
 942                     }
 943                 }
 944             }
 945         }
 946     }
 947
 948
 949 /*
 950 0 . T T. T T T T
 951 1 L . .L . . . .
 952 2 L . .L . . . .
 953 3 . T TL . . . .
 954 4 L . .L . . . .
 955 5 L . .. . . . .
 956 */
 957 //FIXME constraint_intra_pred & partitioning & nnz (let us hope this is just a typo in the spec)
 958     if(top_type){
 959         *(uint32_t*)&h->non_zero_count_cache[4+8*0]= *(uint32_t*)&h->non_zero_count[top_xy][4+3*8];
 960         if(!for_deblock){
 961             h->non_zero_count_cache[1+8*0]= h->non_zero_count[top_xy][1+1*8];
 962             h->non_zero_count_cache[2+8*0]= h->non_zero_count[top_xy][2+1*8];
 963
 964             h->non_zero_count_cache[1+8*3]= h->non_zero_count[top_xy][1+2*8];
 965             h->non_zero_count_cache[2+8*3]= h->non_zero_count[top_xy][2+2*8];
 966         }
 967     }else if(!for_deblock){
 968             h->non_zero_count_cache[1+8*0]=
 969             h->non_zero_count_cache[2+8*0]=
 970
 971             h->non_zero_count_cache[1+8*3]=
 972             h->non_zero_count_cache[2+8*3]=
 973             *(uint32_t*)&h->non_zero_count_cache[4+8*0]= CABAC && !IS_INTRA(mb_type) ? 0 : 0x40404040;
 974     }
 975
 976     for (i=0; i<2; i++) {
 977         if(left_type[i]){
 978             h->non_zero_count_cache[3+8*1 + 2*8*i]= h->non_zero_count[left_xy[i]][left_block[8+0+2*i]];
 979             h->non_zero_count_cache[3+8*2 + 2*8*i]= h->non_zero_count[left_xy[i]][left_block[8+1+2*i]];
 980             if(!for_deblock){
 981                 h->non_zero_count_cache[0+8*1 +   8*i]= h->non_zero_count[left_xy[i]][left_block[8+4+2*i]];
 982                 h->non_zero_count_cache[0+8*4 +   8*i]= h->non_zero_count[left_xy[i]][left_block[8+5+2*i]];
 983             }
 984         }else if(!for_deblock){
 985                 h->non_zero_count_cache[3+8*1 + 2*8*i]=
 986                 h->non_zero_count_cache[3+8*2 + 2*8*i]=
 987                 h->non_zero_count_cache[0+8*1 +   8*i]=
 988                 h->non_zero_count_cache[0+8*4 +   8*i]= CABAC && !IS_INTRA(mb_type) ? 0 : 64;
 989         }
 990     }
 991
 992     // CAVLC 8x8dct requires NNZ values for residual decoding that differ from what the loop filter needs
 993     if(for_deblock && !CABAC && h->pps.transform_8x8_mode){
 994         if(IS_8x8DCT(top_type)){
 995             h->non_zero_count_cache[4+8*0]=
 996             h->non_zero_count_cache[5+8*0]= h->cbp_table[top_xy] & 4;
 997             h->non_zero_count_cache[6+8*0]=
 998             h->non_zero_count_cache[7+8*0]= h->cbp_table[top_xy] & 8;
 999         }
1000         if(IS_8x8DCT(left_type[0])){
1001             h->non_zero_count_cache[3+8*1]=
1002             h->non_zero_count_cache[3+8*2]= h->cbp_table[left_xy[0]]&2; //FIXME check MBAFF
1003         }
1004         if(IS_8x8DCT(left_type[1])){
1005             h->non_zero_count_cache[3+8*3]=
1006             h->non_zero_count_cache[3+8*4]= h->cbp_table[left_xy[1]]&8; //FIXME check MBAFF
1007         }
1008
1009         if(IS_8x8DCT(mb_type)){
1010             h->non_zero_count_cache[scan8[0   ]]= h->non_zero_count_cache[scan8[1   ]]=
1011             h->non_zero_count_cache[scan8[2   ]]= h->non_zero_count_cache[scan8[3   ]]= h->cbp & 1;
1012
1013             h->non_zero_count_cache[scan8[0+ 4]]= h->non_zero_count_cache[scan8[1+ 4]]=
1014             h->non_zero_count_cache[scan8[2+ 4]]= h->non_zero_count_cache[scan8[3+ 4]]= h->cbp & 2;
1015
1016             h->non_zero_count_cache[scan8[0+ 8]]= h->non_zero_count_cache[scan8[1+ 8]]=
1017             h->non_zero_count_cache[scan8[2+ 8]]= h->non_zero_count_cache[scan8[3+ 8]]= h->cbp & 4;
1018
1019             h->non_zero_count_cache[scan8[0+12]]= h->non_zero_count_cache[scan8[1+12]]=
1020             h->non_zero_count_cache[scan8[2+12]]= h->non_zero_count_cache[scan8[3+12]]= h->cbp & 8;
1021         }
1022     }
1023
1024     if( CABAC && !for_deblock) {
1025         // top_cbp
1026         if(top_type) {
1027             h->top_cbp = h->cbp_table[top_xy];
1028         } else if(IS_INTRA(mb_type)) {
1029             h->top_cbp = 0x1C0;
1030         } else {
1031             h->top_cbp = 0;
1032         }
1033         // left_cbp
1034         if (left_type[0]) {
1035             h->left_cbp = h->cbp_table[left_xy[0]] & 0x1f0;
1036         } else if(IS_INTRA(mb_type)) {
1037             h->left_cbp = 0x1C0;
1038         } else {
1039             h->left_cbp = 0;
1040         }
1041         if (left_type[0]) {
1042             h->left_cbp |= ((h->cbp_table[left_xy[0]]>>((left_block[0]&(~1))+1))&0x1) << 1;
1043         }
1044         if (left_type[1]) {
1045             h->left_cbp |= ((h->cbp_table[left_xy[1]]>>((left_block[2]&(~1))+1))&0x1) << 3;
1046         }
1047     }
1048
1049 #if 1
1050     if(IS_INTER(mb_type) || IS_DIRECT(mb_type)){
1051         int list;
1052         for(list=0; list<h->list_count; list++){
1053             if(!for_deblock && !USES_LIST(mb_type, list) && !IS_DIRECT(mb_type)){
1054                 /*if(!h->mv_cache_clean[list]){
1055                     memset(h->mv_cache [list],  0, 8*5*2*sizeof(int16_t)); //FIXME clean only input? clean at all?
1056                     memset(h->ref_cache[list], PART_NOT_AVAILABLE, 8*5*sizeof(int8_t));
1057                     h->mv_cache_clean[list]= 1;
1058                 }*/
1059                 continue;
1060             }
1061             h->mv_cache_clean[list]= 0;
1062
1063             if(USES_LIST(top_type, list)){
1064                 const int b_xy= h->mb2b_xy[top_xy] + 3*h->b_stride;
1065                 const int b8_xy= h->mb2b8_xy[top_xy] + h->b8_stride;
1066                 AV_COPY128(h->mv_cache[list][scan8[0] + 0 - 1*8], s->current_picture.motion_val[list][b_xy + 0]);
1067                 if(for_deblock){
1068                     int (*ref2frm)[64] = h->ref2frm[ h->slice_table[top_xy]&(MAX_SLICES-1) ][0] + (MB_MBAFF ? 20 : 2);
1069                     h->ref_cache[list][scan8[0] + 0 - 1*8]=
1070                     h->ref_cache[list][scan8[0] + 1 - 1*8]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + 0]];
1071                     h->ref_cache[list][scan8[0] + 2 - 1*8]=
1072                     h->ref_cache[list][scan8[0] + 3 - 1*8]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + 1]];
1073                 }else{
1074                     h->ref_cache[list][scan8[0] + 0 - 1*8]=
1075                     h->ref_cache[list][scan8[0] + 1 - 1*8]= s->current_picture.ref_index[list][b8_xy + 0];
1076                     h->ref_cache[list][scan8[0] + 2 - 1*8]=
1077                     h->ref_cache[list][scan8[0] + 3 - 1*8]= s->current_picture.ref_index[list][b8_xy + 1];
1078                 }
1079             }else{
1080                 AV_ZERO128(h->mv_cache[list][scan8[0] + 0 - 1*8]);
1081                 *(uint32_t*)&h->ref_cache[list][scan8[0] + 0 - 1*8]= (((for_deblock||top_type) ? LIST_NOT_USED : PART_NOT_AVAILABLE)&0xFF)*0x01010101;
1082             }
1083
1084             for(i=0; i<2; i++){
1085                 int cache_idx = scan8[0] - 1 + i*2*8;
1086                 if(USES_LIST(left_type[i], list)){
1087                     const int b_xy= h->mb2b_xy[left_xy[i]] + 3;
1088                     const int b8_xy= h->mb2b8_xy[left_xy[i]] + 1;
1089                     *(uint32_t*)h->mv_cache[list][cache_idx  ]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + h->b_stride*left_block[0+i*2]];
1090                     *(uint32_t*)h->mv_cache[list][cache_idx+8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + h->b_stride*left_block[1+i*2]];
1091                     if(for_deblock){
1092                         int (*ref2frm)[64] = h->ref2frm[ h->slice_table[left_xy[i]]&(MAX_SLICES-1) ][0] + (MB_MBAFF ? 20 : 2);
1093                         h->ref_cache[list][cache_idx  ]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + h->b8_stride*(left_block[0+i*2]>>1)]];
1094                         h->ref_cache[list][cache_idx+8]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + h->b8_stride*(left_block[1+i*2]>>1)]];
1095                     }else{
1096                         h->ref_cache[list][cache_idx  ]= s->current_picture.ref_index[list][b8_xy + h->b8_stride*(left_block[0+i*2]>>1)];
1097                         h->ref_cache[list][cache_idx+8]= s->current_picture.ref_index[list][b8_xy + h->b8_stride*(left_block[1+i*2]>>1)];
1098                     }
1099                 }else{
1100                     *(uint32_t*)h->mv_cache [list][cache_idx  ]=
1101                     *(uint32_t*)h->mv_cache [list][cache_idx+8]= 0;
1102                     h->ref_cache[list][cache_idx  ]=
1103                     h->ref_cache[list][cache_idx+8]= (for_deblock||left_type[i]) ? LIST_NOT_USED : PART_NOT_AVAILABLE;
1104                 }
1105             }
1106
1107             if(for_deblock || ((IS_DIRECT(mb_type) && !h->direct_spatial_mv_pred) && !FRAME_MBAFF))
1108                 continue;
1109
1110             if(USES_LIST(topleft_type, list)){
1111                 const int b_xy = h->mb2b_xy[topleft_xy] + 3 + h->b_stride + (topleft_partition & 2*h->b_stride);
1112                 const int b8_xy= h->mb2b8_xy[topleft_xy] + 1 + (topleft_partition & h->b8_stride);
1113                 *(uint32_t*)h->mv_cache[list][scan8[0] - 1 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy];
1114                 h->ref_cache[list][scan8[0] - 1 - 1*8]= s->current_picture.ref_index[list][b8_xy];
1115             }else{
1116                 *(uint32_t*)h->mv_cache[list][scan8[0] - 1 - 1*8]= 0;
1117                 h->ref_cache[list][scan8[0] - 1 - 1*8]= topleft_type ? LIST_NOT_USED : PART_NOT_AVAILABLE;
1118             }
1119
1120             if(USES_LIST(topright_type, list)){
1121                 const int b_xy= h->mb2b_xy[topright_xy] + 3*h->b_stride;
1122                 const int b8_xy= h->mb2b8_xy[topright_xy] + h->b8_stride;
1123                 *(uint32_t*)h->mv_cache[list][scan8[0] + 4 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy];
1124                 h->ref_cache[list][scan8[0] + 4 - 1*8]= s->current_picture.ref_index[list][b8_xy];
1125             }else{
1126                 *(uint32_t*)h->mv_cache [list][scan8[0] + 4 - 1*8]= 0;
1127                 h->ref_cache[list][scan8[0] + 4 - 1*8]= topright_type ? LIST_NOT_USED : PART_NOT_AVAILABLE;
1128             }
1129
1130             if((IS_SKIP(mb_type) || IS_DIRECT(mb_type)) && !FRAME_MBAFF)
1131                 continue;
1132
1133             h->ref_cache[list][scan8[5 ]+1] =
1134             h->ref_cache[list][scan8[7 ]+1] =
1135             h->ref_cache[list][scan8[13]+1] =  //FIXME remove past 3 (init somewhere else)
1136             h->ref_cache[list][scan8[4 ]] =
1137             h->ref_cache[list][scan8[12]] = PART_NOT_AVAILABLE;
1138             *(uint32_t*)h->mv_cache [list][scan8[5 ]+1]=
1139             *(uint32_t*)h->mv_cache [list][scan8[7 ]+1]=
1140             *(uint32_t*)h->mv_cache [list][scan8[13]+1]= //FIXME remove past 3 (init somewhere else)
1141             *(uint32_t*)h->mv_cache [list][scan8[4 ]]=
1142             *(uint32_t*)h->mv_cache [list][scan8[12]]= 0;
1143
1144             if( CABAC ) {
1145                 /* XXX beurk, Load mvd */
1146                 if(USES_LIST(top_type, list)){
1147                     const int b_xy= h->mb2b_xy[top_xy] + 3*h->b_stride;
1148                     AV_COPY128(h->mvd_cache[list][scan8[0] + 0 - 1*8], h->mvd_table[list][b_xy + 0]);
1149                 }else{
1150                     AV_ZERO128(h->mvd_cache[list][scan8[0] + 0 - 1*8]);
1151                 }
1152                 if(USES_LIST(left_type[0], list)){
1153                     const int b_xy= h->mb2b_xy[left_xy[0]] + 3;
1154                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 0*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[0]];
1155                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 1*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[1]];
1156                 }else{
1157                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 0*8]=
1158                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 1*8]= 0;
1159                 }
1160                 if(USES_LIST(left_type[1], list)){
1161                     const int b_xy= h->mb2b_xy[left_xy[1]] + 3;
1162                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 2*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[2]];
1163                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 3*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[3]];
1164                 }else{
1165                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 2*8]=
1166                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 3*8]= 0;
1167                 }
1168                 *(uint32_t*)h->mvd_cache [list][scan8[5 ]+1]=
1169                 *(uint32_t*)h->mvd_cache [list][scan8[7 ]+1]=
1170                 *(uint32_t*)h->mvd_cache [list][scan8[13]+1]= //FIXME remove past 3 (init somewhere else)
1171                 *(uint32_t*)h->mvd_cache [list][scan8[4 ]]=
1172                 *(uint32_t*)h->mvd_cache [list][scan8[12]]= 0;
1173
1174                 if(h->slice_type_nos == FF_B_TYPE){
1175                     fill_rectangle(&h->direct_cache[scan8[0]], 4, 4, 8, 0, 1);
1176
1177                     if(IS_DIRECT(top_type)){
1178                         *(uint32_t*)&h->direct_cache[scan8[0] - 1*8]= 0x01010101;
1179                     }else if(IS_8X8(top_type)){
1180                         int b8_xy = h->mb2b8_xy[top_xy] + h->b8_stride;
1181                         h->direct_cache[scan8[0] + 0 - 1*8]= h->direct_table[b8_xy];
1182                         h->direct_cache[scan8[0] + 2 - 1*8]= h->direct_table[b8_xy + 1];
1183                     }else{
1184                         *(uint32_t*)&h->direct_cache[scan8[0] - 1*8]= 0;
1185                     }
1186
1187                     if(IS_DIRECT(left_type[0]))
1188                         h->direct_cache[scan8[0] - 1 + 0*8]= 1;
1189                     else if(IS_8X8(left_type[0]))
1190                         h->direct_cache[scan8[0] - 1 + 0*8]= h->direct_table[h->mb2b8_xy[left_xy[0]] + 1 + h->b8_stride*(left_block[0]>>1)];
1191                     else
1192                         h->direct_cache[scan8[0] - 1 + 0*8]= 0;
1193
1194                     if(IS_DIRECT(left_type[1]))
1195                         h->direct_cache[scan8[0] - 1 + 2*8]= 1;
1196                     else if(IS_8X8(left_type[1]))
1197                         h->direct_cache[scan8[0] - 1 + 2*8]= h->direct_table[h->mb2b8_xy[left_xy[1]] + 1 + h->b8_stride*(left_block[2]>>1)];
1198                     else
1199                         h->direct_cache[scan8[0] - 1 + 2*8]= 0;
1200                 }
1201             }
1202
1203             if(FRAME_MBAFF){
1204 #define MAP_MVS\
1205                     MAP_F2F(scan8[0] - 1 - 1*8, topleft_type)\
1206                     MAP_F2F(scan8[0] + 0 - 1*8, top_type)\
1207                     MAP_F2F(scan8[0] + 1 - 1*8, top_type)\
1208                     MAP_F2F(scan8[0] + 2 - 1*8, top_type)\
1209                     MAP_F2F(scan8[0] + 3 - 1*8, top_type)\
1210                     MAP_F2F(scan8[0] + 4 - 1*8, topright_type)\
1211                     MAP_F2F(scan8[0] - 1 + 0*8, left_type[0])\
1212                     MAP_F2F(scan8[0] - 1 + 1*8, left_type[0])\
1213                     MAP_F2F(scan8[0] - 1 + 2*8, left_type[1])\
1214                     MAP_F2F(scan8[0] - 1 + 3*8, left_type[1])
1215                 if(MB_FIELD){
1216 #define MAP_F2F(idx, mb_type)\
1217                     if(!IS_INTERLACED(mb_type) && h->ref_cache[list][idx] >= 0){\
1218                         h->ref_cache[list][idx] <<= 1;\
1219                         h->mv_cache[list][idx][1] /= 2;\
1220                         h->mvd_cache[list][idx][1] /= 2;\
1221                     }
1222                     MAP_MVS
1223 #undef MAP_F2F
1224                 }else{
1225 #define MAP_F2F(idx, mb_type)\
1226                     if(IS_INTERLACED(mb_type) && h->ref_cache[list][idx] >= 0){\
1227                         h->ref_cache[list][idx] >>= 1;\
1228                         h->mv_cache[list][idx][1] <<= 1;\
1229                         h->mvd_cache[list][idx][1] <<= 1;\
1230                     }
1231                     MAP_MVS
1232 #undef MAP_F2F
1233                 }
1234             }
1235         }
1236     }
1237 #endif
1238
1239     if(!for_deblock)
1240         h->neighbor_transform_size= !!IS_8x8DCT(top_type) + !!IS_8x8DCT(left_type[0]);
1241     return 0;
1242 }
1243
1244 static void fill_decode_caches(H264Context *h, int mb_type){
1245     fill_caches(h, mb_type, 0);
1246 }
1247
1248 /**
1249  *
1250  * @returns non zero if the loop filter can be skiped
1251  */
1252 static int fill_filter_caches(H264Context *h, int mb_type){
1253     return fill_caches(h, mb_type, 1);
1254 }
1255
1256 /**
1257  * gets the predicted intra4x4 prediction mode.
1258  */
1259 static inline int pred_intra_mode(H264Context *h, int n){
1260     const int index8= scan8[n];
1261     const int left= h->intra4x4_pred_mode_cache[index8 - 1];
1262     const int top = h->intra4x4_pred_mode_cache[index8 - 8];
1263     const int min= FFMIN(left, top);
1264
1265     tprintf(h->s.avctx, "mode:%d %d min:%d\n", left ,top, min);
1266
1267     if(min<0) return DC_PRED;
1268     else      return min;
1269 }
1270
1271 static inline void write_back_non_zero_count(H264Context *h){
1272     const int mb_xy= h->mb_xy;
1273
1274     AV_COPY64(&h->non_zero_count[mb_xy][ 0], &h->non_zero_count_cache[0+8*1]);
1275     AV_COPY64(&h->non_zero_count[mb_xy][ 8], &h->non_zero_count_cache[0+8*2]);
1276     *((uint32_t*)&h->non_zero_count[mb_xy][16]) = *((uint32_t*)&h->non_zero_count_cache[0+8*5]);
1277     *((uint32_t*)&h->non_zero_count[mb_xy][20]) = *((uint32_t*)&h->non_zero_count_cache[4+8*3]);
1278     AV_COPY64(&h->non_zero_count[mb_xy][24], &h->non_zero_count_cache[0+8*4]);
1279 }
1280
1281 static inline void write_back_motion(H264Context *h, int mb_type){
1282     MpegEncContext * const s = &h->s;
1283     const int b_xy = 4*s->mb_x + 4*s->mb_y*h->b_stride;
1284     const int b8_xy= 2*s->mb_x + 2*s->mb_y*h->b8_stride;
1285     int list;
1286
1287     if(!USES_LIST(mb_type, 0))
1288         fill_rectangle(&s->current_picture.ref_index[0][b8_xy], 2, 2, h->b8_stride, (uint8_t)LIST_NOT_USED, 1);
1289
1290     for(list=0; list<h->list_count; list++){
1291         int y, b_stride;
1292         int16_t (*mv_dst)[2];
1293         int16_t (*mv_src)[2];
1294
1295         if(!USES_LIST(mb_type, list))
1296             continue;
1297
1298         b_stride = h->b_stride;
1299         mv_dst   = &s->current_picture.motion_val[list][b_xy];
1300         mv_src   = &h->mv_cache[list][scan8[0]];
1301         for(y=0; y<4; y++){
1302             AV_COPY128(mv_dst + y*b_stride, mv_src + 8*y);
1303         }
1304         if( CABAC ) {
1305             int16_t (*mvd_dst)[2] = &h->mvd_table[list][b_xy];
1306             int16_t (*mvd_src)[2] = &h->mvd_cache[list][scan8[0]];
1307             if(IS_SKIP(mb_type))
1308                 fill_rectangle(mvd_dst, 4, 4, h->b_stride, 0, 4);
1309             else
1310             for(y=0; y<4; y++){
1311                 AV_COPY128(mvd_dst + y*b_stride, mvd_src + 8*y);
1312             }
1313         }
1314
1315         {
1316             int8_t *ref_index = &s->current_picture.ref_index[list][b8_xy];
1317             ref_index[0+0*h->b8_stride]= h->ref_cache[list][scan8[0]];
1318             ref_index[1+0*h->b8_stride]= h->ref_cache[list][scan8[4]];
1319             ref_index[0+1*h->b8_stride]= h->ref_cache[list][scan8[8]];
1320             ref_index[1+1*h->b8_stride]= h->ref_cache[list][scan8[12]];
1321         }
1322     }
1323
1324     if(h->slice_type_nos == FF_B_TYPE && CABAC){
1325         if(IS_8X8(mb_type)){
1326             uint8_t *direct_table = &h->direct_table[b8_xy];
1327             direct_table[1+0*h->b8_stride] = IS_DIRECT(h->sub_mb_type[1]) ? 1 : 0;
1328             direct_table[0+1*h->b8_stride] = IS_DIRECT(h->sub_mb_type[2]) ? 1 : 0;
1329             direct_table[1+1*h->b8_stride] = IS_DIRECT(h->sub_mb_type[3]) ? 1 : 0;
1330         }
1331     }
1332 }
1333
1334 static inline int get_dct8x8_allowed(H264Context *h){
1335     if(h->sps.direct_8x8_inference_flag)
1336         return !(*(uint64_t*)h->sub_mb_type & ((MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8                )*0x0001000100010001ULL));
1337     else
1338         return !(*(uint64_t*)h->sub_mb_type & ((MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8|MB_TYPE_DIRECT2)*0x0001000100010001ULL));
1339 }
1340
1341 static void predict_field_decoding_flag(H264Context *h){
1342     MpegEncContext * const s = &h->s;
1343     const int mb_xy= h->mb_xy;
1344     int mb_type = (h->slice_table[mb_xy-1] == h->slice_num)
1345                 ? s->current_picture.mb_type[mb_xy-1]
1346                 : (h->slice_table[mb_xy-s->mb_stride] == h->slice_num)
1347                 ? s->current_picture.mb_type[mb_xy-s->mb_stride]
1348                 : 0;
1349     h->mb_mbaff = h->mb_field_decoding_flag = IS_INTERLACED(mb_type) ? 1 : 0;
1350 }
1351
1352 /**
1353  * decodes a P_SKIP or B_SKIP macroblock
1354  */
1355 static void decode_mb_skip(H264Context *h){
1356     MpegEncContext * const s = &h->s;
1357     const int mb_xy= h->mb_xy;
1358     int mb_type=0;
1359
1360     memset(h->non_zero_count[mb_xy], 0, 32);
1361     memset(h->non_zero_count_cache + 8, 0, 8*5); //FIXME ugly, remove pfui
1362
1363     if(MB_FIELD)
1364         mb_type|= MB_TYPE_INTERLACED;
1365
1366     if( h->slice_type_nos == FF_B_TYPE )
1367     {
1368         // just for fill_caches. pred_direct_motion will set the real mb_type
1369         mb_type|= MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2|MB_TYPE_SKIP;
1370
1371         fill_decode_caches(h, mb_type); //FIXME check what is needed and what not ...
1372         ff_h264_pred_direct_motion(h, &mb_type);
1373         mb_type|= MB_TYPE_SKIP;
1374     }
1375     else
1376     {
1377         int mx, my;
1378         mb_type|= MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P1L0|MB_TYPE_SKIP;
1379
1380         fill_decode_caches(h, mb_type); //FIXME check what is needed and what not ...
1381         pred_pskip_motion(h, &mx, &my);
1382         fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, 0, 1);
1383         fill_rectangle(  h->mv_cache[0][scan8[0]], 4, 4, 8, pack16to32(mx,my), 4);
1384     }
1385
1386     write_back_motion(h, mb_type);
1387     s->current_picture.mb_type[mb_xy]= mb_type;
1388     s->current_picture.qscale_table[mb_xy]= s->qscale;
1389     h->slice_table[ mb_xy ]= h->slice_num;
1390     h->prev_mb_skipped= 1;
1391 }
1392
1393 #include "h264_mvpred.h" //For pred_pskip_motion()
1394
1395 #endif /* AVCODEC_H264_H */