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/*

 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder

 * Copyright (c) 2003 Michael Niedermayer 

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * H.264 / AVC / MPEG4 part10 codec.

 * @author Michael Niedermayer 

 */

#ifndef AVCODEC_H264_H

#define AVCODEC_H264_H

#include "libavutil/intreadwrite.h"

#include "cabac.h"

#include "error_resilience.h"

#include "get_bits.h"

#include "mpegvideo.h"

#include "h264chroma.h"

#include "h264dsp.h"

#include "h264pred.h"

#include "h264qpel.h"

#include "rectangle.h"

#define MAX_SPS_COUNT          32

#define MAX_PPS_COUNT         256

#define MAX_MMCO_COUNT         66

#define MAX_DELAYED_PIC_COUNT  16

#define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes

/* Compiling in interlaced support reduces the speed

 * of progressive decoding by about 2%. */

#define ALLOW_INTERLACE

#define FMO 0

/**

 * The maximum number of slices supported by the decoder.

 * must be a power of 2

 */

#define MAX_SLICES 16

#ifdef ALLOW_INTERLACE

#define MB_MBAFF(h)    h->mb_mbaff

#define MB_FIELD(h)    h->mb_field_decoding_flag

#define FRAME_MBAFF(h) h->mb_aff_frame

#define FIELD_PICTURE(h) (h->picture_structure != PICT_FRAME)

#define LEFT_MBS 2

#define LTOP     0

#define LBOT     1

#define LEFT(i)  (i)

#else

#define MB_MBAFF(h)      0

#define MB_FIELD(h)      0

#define FRAME_MBAFF(h)   0

#define FIELD_PICTURE(h) 0

#undef  IS_INTERLACED

#define IS_INTERLACED(mb_type) 0

#define LEFT_MBS 1

#define LTOP     0

#define LBOT     0

#define LEFT(i)  0

#endif

#define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))

#ifndef CABAC

#define CABAC(h) h->pps.cabac

#endif

#define CHROMA(h)    (h->sps.chroma_format_idc)

#define CHROMA422(h) (h->sps.chroma_format_idc == 2)

#define CHROMA444(h) (h->sps.chroma_format_idc == 3)

#define EXTENDED_SAR       255

#define MB_TYPE_REF0       MB_TYPE_ACPRED // dirty but it fits in 16 bit

#define MB_TYPE_8x8DCT     0x01000000

#define IS_REF0(a)         ((a) & MB_TYPE_REF0)

#define IS_8x8DCT(a)       ((a) & MB_TYPE_8x8DCT)

#define QP_MAX_NUM (51 + 6*6)           // The maximum supported qp

/* NAL unit types */

enum {

    NAL_SLICE = 1,

    NAL_DPA,

    NAL_DPB,

    NAL_DPC,

    NAL_IDR_SLICE,

    NAL_SEI,

    NAL_SPS,

    NAL_PPS,

    NAL_AUD,

    NAL_END_SEQUENCE,

    NAL_END_STREAM,

    NAL_FILLER_DATA,

    NAL_SPS_EXT,

    NAL_AUXILIARY_SLICE = 19,

    NAL_FF_IGNORE       = 0xff0f001,

};

/**

 * SEI message types

 */

typedef enum {

    SEI_BUFFERING_PERIOD            = 0,   ///< buffering period (H.264, D.1.1)

    SEI_TYPE_PIC_TIMING             = 1,   ///< picture timing

    SEI_TYPE_USER_DATA_ITU_T_T35    = 4,   ///< user data registered by ITU-T Recommendation T.35

    SEI_TYPE_USER_DATA_UNREGISTERED = 5,   ///< unregistered user data

    SEI_TYPE_RECOVERY_POINT         = 6,   ///< recovery point (frame # to decoder sync)

    SEI_TYPE_FRAME_PACKING          = 45,  ///< frame packing arrangement

} SEI_Type;

/**

 * pic_struct in picture timing SEI message

 */

typedef enum {

    SEI_PIC_STRUCT_FRAME             = 0, ///<  0: %frame

    SEI_PIC_STRUCT_TOP_FIELD         = 1, ///<  1: top field

    SEI_PIC_STRUCT_BOTTOM_FIELD      = 2, ///<  2: bottom field

    SEI_PIC_STRUCT_TOP_BOTTOM        = 3, ///<  3: top field, bottom field, in that order

    SEI_PIC_STRUCT_BOTTOM_TOP        = 4, ///<  4: bottom field, top field, in that order

    SEI_PIC_STRUCT_TOP_BOTTOM_TOP    = 5, ///<  5: top field, bottom field, top field repeated, in that order

    SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///<  6: bottom field, top field, bottom field repeated, in that order

    SEI_PIC_STRUCT_FRAME_DOUBLING    = 7, ///<  7: %frame doubling

    SEI_PIC_STRUCT_FRAME_TRIPLING    = 8  ///<  8: %frame tripling

} SEI_PicStructType;

/**

 * frame_packing_arrangement types

 */

typedef enum {

    SEI_FPA_TYPE_CHECKERBOARD        = 0,

    SEI_FPA_TYPE_INTERLEAVE_COLUMN   = 1,

    SEI_FPA_TYPE_INTERLEAVE_ROW      = 2,

    SEI_FPA_TYPE_SIDE_BY_SIDE        = 3,

    SEI_FPA_TYPE_TOP_BOTTOM          = 4,

    SEI_FPA_TYPE_INTERLEAVE_TEMPORAL = 5,

    SEI_FPA_TYPE_2D                  = 6,

} SEI_FpaType;

/**

 * Sequence parameter set

 */

typedef struct SPS {

    int profile_idc;

    int level_idc;

    int chroma_format_idc;

    int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag

    int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4

    int poc_type;                      ///< pic_order_cnt_type

    int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4

    int delta_pic_order_always_zero_flag;

    int offset_for_non_ref_pic;

    int offset_for_top_to_bottom_field;

    int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle

    int ref_frame_count;               ///< num_ref_frames

    int gaps_in_frame_num_allowed_flag;

    int mb_width;                      ///< pic_width_in_mbs_minus1 + 1

    int mb_height;                     ///< pic_height_in_map_units_minus1 + 1

    int frame_mbs_only_flag;

    int mb_aff;                        ///< mb_adaptive_frame_field_flag

    int direct_8x8_inference_flag;

    int crop;                          ///< frame_cropping_flag

    /* those 4 are already in luma samples */

    unsigned int crop_left;            ///< frame_cropping_rect_left_offset

    unsigned int crop_right;           ///< frame_cropping_rect_right_offset

    unsigned int crop_top;             ///< frame_cropping_rect_top_offset

    unsigned int crop_bottom;          ///< frame_cropping_rect_bottom_offset

    int vui_parameters_present_flag;

    AVRational sar;

    int video_signal_type_present_flag;

    int full_range;

    int colour_description_present_flag;

    enum AVColorPrimaries color_primaries;

    enum AVColorTransferCharacteristic color_trc;

    enum AVColorSpace colorspace;

    int timing_info_present_flag;

    uint32_t num_units_in_tick;

    uint32_t time_scale;

    int fixed_frame_rate_flag;

    short offset_for_ref_frame[256]; // FIXME dyn aloc?

    int bitstream_restriction_flag;

    int num_reorder_frames;

    int scaling_matrix_present;

    uint8_t scaling_matrix4[6][16];

    uint8_t scaling_matrix8[6][64];

    int nal_hrd_parameters_present_flag;

    int vcl_hrd_parameters_present_flag;

    int pic_struct_present_flag;

    int time_offset_length;

    int cpb_cnt;                          ///< See H.264 E.1.2

    int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1

    int cpb_removal_delay_length;         ///< cpb_removal_delay_length_minus1 + 1

    int dpb_output_delay_length;          ///< dpb_output_delay_length_minus1 + 1

    int bit_depth_luma;                   ///< bit_depth_luma_minus8 + 8

    int bit_depth_chroma;                 ///< bit_depth_chroma_minus8 + 8

    int residual_color_transform_flag;    ///< residual_colour_transform_flag

    int constraint_set_flags;             ///< constraint_set[0-3]_flag

    int new;                              ///< flag to keep track if the decoder context needs re-init due to changed SPS

} SPS;

/**

 * Picture parameter set

 */

typedef struct PPS {

    unsigned int sps_id;

    int cabac;                  ///< entropy_coding_mode_flag

    int pic_order_present;      ///< pic_order_present_flag

    int slice_group_count;      ///< num_slice_groups_minus1 + 1

    int mb_slice_group_map_type;

    unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1

    int weighted_pred;          ///< weighted_pred_flag

    int weighted_bipred_idc;

    int init_qp;                ///< pic_init_qp_minus26 + 26

    int init_qs;                ///< pic_init_qs_minus26 + 26

    int chroma_qp_index_offset[2];

    int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag

    int constrained_intra_pred;     ///< constrained_intra_pred_flag

    int redundant_pic_cnt_present;  ///< redundant_pic_cnt_present_flag

    int transform_8x8_mode;         ///< transform_8x8_mode_flag

    uint8_t scaling_matrix4[6][16];

    uint8_t scaling_matrix8[6][64];

    uint8_t chroma_qp_table[2][QP_MAX_NUM+1];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table

    int chroma_qp_diff;

} PPS;

/**

 * Frame Packing Arrangement Type

 */

typedef struct FPA {

    int         frame_packing_arrangement_id;

    int         frame_packing_arrangement_cancel_flag; ///< is previous arrangement canceled, -1 if never received

    SEI_FpaType frame_packing_arrangement_type;

    int         frame_packing_arrangement_repetition_period;

    int         content_interpretation_type;

    int         quincunx_sampling_flag;

} FPA;

/**

 * Memory management control operation opcode.

 */

typedef enum MMCOOpcode {

    MMCO_END = 0,

    MMCO_SHORT2UNUSED,

    MMCO_LONG2UNUSED,

    MMCO_SHORT2LONG,

    MMCO_SET_MAX_LONG,

    MMCO_RESET,

    MMCO_LONG,

} MMCOOpcode;

/**

 * Memory management control operation.

 */

typedef struct MMCO {

    MMCOOpcode opcode;

    int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)

    int long_arg;       ///< index, pic_num, or num long refs depending on opcode

} MMCO;

/**

 * H264Context

 */

typedef struct H264Context {

    AVCodecContext *avctx;

    VideoDSPContext vdsp;

    H264DSPContext h264dsp;

    H264ChromaContext h264chroma;

    H264QpelContext h264qpel;

    MotionEstContext me;

    ParseContext parse_context;

    GetBitContext gb;

    DSPContext       dsp;

    ERContext er;

    Picture *DPB;

    Picture *cur_pic_ptr;

    Picture cur_pic;

    int pixel_shift;    ///< 0 for 8-bit H264, 1 for high-bit-depth H264

    int chroma_qp[2];   // QPc

    int qp_thresh;      ///< QP threshold to skip loopfilter

    /* coded dimensions -- 16 * mb w/h */

    int width, height;

    ptrdiff_t linesize, uvlinesize;

    int chroma_x_shift, chroma_y_shift;

    int qscale;

    int droppable;

    int data_partitioning;

    int coded_picture_number;

    int low_delay;

    int context_initialized;

    int flags;

    int workaround_bugs;

    int prev_mb_skipped;

    int next_mb_skipped;

    // prediction stuff

    int chroma_pred_mode;

    int intra16x16_pred_mode;

    int topleft_mb_xy;

    int top_mb_xy;

    int topright_mb_xy;

    int left_mb_xy[LEFT_MBS];

    int topleft_type;

    int top_type;

    int topright_type;

    int left_type[LEFT_MBS];

    const uint8_t *left_block;

    int topleft_partition;

    int8_t intra4x4_pred_mode_cache[5 * 8];

    int8_t(*intra4x4_pred_mode);

    H264PredContext hpc;

    unsigned int topleft_samples_available;

    unsigned int top_samples_available;

    unsigned int topright_samples_available;

    unsigned int left_samples_available;

    uint8_t (*top_borders[2])[(16 * 3) * 2];

    /**

     * non zero coeff count cache.

     * is 64 if not available.

     */

    DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];

    uint8_t (*non_zero_count)[48];

    /**

     * Motion vector cache.

     */

    DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];

    DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];

#define LIST_NOT_USED -1 // FIXME rename?

#define PART_NOT_AVAILABLE -2

    /**

     * number of neighbors (top and/or left) that used 8x8 dct

     */

    int neighbor_transform_size;

    /**

     * block_offset[ 0..23] for frame macroblocks

     * block_offset[24..47] for field macroblocks

     */

    int block_offset[2 * (16 * 3)];

    uint32_t *mb2b_xy;  // FIXME are these 4 a good idea?

    uint32_t *mb2br_xy;

    int b_stride;       // FIXME use s->b4_stride

    ptrdiff_t mb_linesize;  ///< may be equal to s->linesize or s->linesize * 2, for mbaff

    ptrdiff_t mb_uvlinesize;

    unsigned current_sps_id; ///< id of the current SPS

    SPS sps; ///< current sps

    /**

     * current pps

     */

    PPS pps; // FIXME move to Picture perhaps? (->no) do we need that?

    uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16]; // FIXME should these be moved down?

    uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64];

    uint32_t(*dequant4_coeff[6])[16];

    uint32_t(*dequant8_coeff[6])[64];

    int slice_num;

    uint16_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1

    int slice_type;

    int slice_type_nos;         ///< S free slice type (SI/SP are remapped to I/P)

    int slice_type_fixed;

    // interlacing specific flags

    int mb_aff_frame;

    int mb_field_decoding_flag;

    int mb_mbaff;               ///< mb_aff_frame && mb_field_decoding_flag

    int picture_structure;

    int first_field;

    DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];

    // Weighted pred stuff

    int use_weight;

    int use_weight_chroma;

    int luma_log2_weight_denom;

    int chroma_log2_weight_denom;

    // The following 2 can be changed to int8_t but that causes 10cpu cycles speedloss

    int luma_weight[48][2][2];

    int chroma_weight[48][2][2][2];

    int implicit_weight[48][48][2];

    int direct_spatial_mv_pred;

    int col_parity;

    int col_fieldoff;

    int dist_scale_factor[32];

    int dist_scale_factor_field[2][32];

    int map_col_to_list0[2][16 + 32];

    int map_col_to_list0_field[2][2][16 + 32];

    /**

     * num_ref_idx_l0/1_active_minus1 + 1

     */

    unsigned int ref_count[2];          ///< counts frames or fields, depending on current mb mode

    unsigned int list_count;

    uint8_t *list_counts;               ///< Array of list_count per MB specifying the slice type

    Picture ref_list[2][48];            /**< 0..15: frame refs, 16..47: mbaff field refs.

                                         *   Reordered version of default_ref_list

                                         *   according to picture reordering in slice header */

    int ref2frm[MAX_SLICES][2][64];     ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1

    // data partitioning

    GetBitContext intra_gb;

    GetBitContext inter_gb;

    GetBitContext *intra_gb_ptr;

    GetBitContext *inter_gb_ptr;

    const uint8_t *intra_pcm_ptr;

    DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2]; ///< as a dct coeffecient is int32_t in high depth, we need to reserve twice the space.

    DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];

    int16_t mb_padding[256 * 2];        ///< 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

    /**

     * Cabac

     */

    CABACContext cabac;

    uint8_t cabac_state[1024];

    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */

    uint16_t *cbp_table;

    int cbp;

    int top_cbp;

    int left_cbp;

    /* chroma_pred_mode for i4x4 or i16x16, else 0 */

    uint8_t *chroma_pred_mode_table;

    int last_qscale_diff;

    uint8_t (*mvd_table[2])[2];

    DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];

    uint8_t *direct_table;

    uint8_t direct_cache[5 * 8];

    uint8_t zigzag_scan[16];

    uint8_t zigzag_scan8x8[64];

    uint8_t zigzag_scan8x8_cavlc[64];

    uint8_t field_scan[16];

    uint8_t field_scan8x8[64];

    uint8_t field_scan8x8_cavlc[64];

    uint8_t zigzag_scan_q0[16];

    uint8_t zigzag_scan8x8_q0[64];

    uint8_t zigzag_scan8x8_cavlc_q0[64];

    uint8_t field_scan_q0[16];

    uint8_t field_scan8x8_q0[64];

    uint8_t field_scan8x8_cavlc_q0[64];

    int x264_build;

    int mb_x, mb_y;

    int resync_mb_x;

    int resync_mb_y;

    int mb_skip_run;

    int mb_height, mb_width;

    int mb_stride;

    int mb_num;

    int mb_xy;

    int is_complex;

    // deblock

    int deblocking_filter;          ///< disable_deblocking_filter_idc with 1 <-> 0

    int slice_alpha_c0_offset;

    int slice_beta_offset;

    // =============================================================

    // Things below are not used in the MB or more inner code

    int nal_ref_idc;

    int nal_unit_type;

    uint8_t *rbsp_buffer[2];

    unsigned int rbsp_buffer_size[2];

    /**

     * Used to parse AVC variant of h264

     */

    int is_avc;           ///< this flag is != 0 if codec is avc1

    int nal_length_size;  ///< Number of bytes used for nal length (1, 2 or 4)

    int got_first;        ///< this flag is != 0 if we've parsed a frame

    int bit_depth_luma;         ///< luma bit depth from sps to detect changes

    int chroma_format_idc;      ///< chroma format from sps to detect changes

    SPS *sps_buffers[MAX_SPS_COUNT];

    PPS *pps_buffers[MAX_PPS_COUNT];

    int dequant_coeff_pps;      ///< reinit tables when pps changes

    uint16_t *slice_table_base;

    // POC stuff

    int poc_lsb;

    int poc_msb;

    int delta_poc_bottom;

    int delta_poc[2];

    int frame_num;

    int prev_poc_msb;           ///< poc_msb of the last reference pic for POC type 0

    int prev_poc_lsb;           ///< poc_lsb of the last reference pic for POC type 0

    int frame_num_offset;       ///< for POC type 2

    int prev_frame_num_offset;  ///< for POC type 2

    int prev_frame_num;         ///< frame_num of the last pic for POC type 1/2

    /**

     * frame_num for frames or 2 * frame_num + 1 for field pics.

     */

    int curr_pic_num;

    /**

     * max_frame_num or 2 * max_frame_num for field pics.

     */

    int max_pic_num;

    int redundant_pic_count;

    Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture

    Picture *short_ref[32];

    Picture *long_ref[32];

    Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?

    int last_pocs[MAX_DELAYED_PIC_COUNT];

    Picture *next_output_pic;

    int outputed_poc;

    int next_outputed_poc;

    /**

     * memory management control operations buffer.

     */

    MMCO mmco[MAX_MMCO_COUNT];

    int mmco_index;

    int mmco_reset;

    int long_ref_count;     ///< number of actual long term references

    int short_ref_count;    ///< number of actual short term references

    int cabac_init_idc;

    /**

     * @name Members for slice based multithreading

     * @{

     */

    struct H264Context *thread_context[MAX_THREADS];

    /**

     * current slice number, used to initialize slice_num of each thread/context

     */

    int current_slice;

    /**

     * Max number of threads / contexts.

     * This is equal to AVCodecContext.thread_count unless

     * multithreaded decoding is impossible, in which case it is

     * reduced to 1.

     */

    int max_contexts;

    int slice_context_count;

    /**

     *  1 if the single thread fallback warning has already been

     *  displayed, 0 otherwise.

     */

    int single_decode_warning;

    enum AVPictureType pict_type;

    int last_slice_type;

    unsigned int last_ref_count[2];

    /** @} */

    /**

     * pic_struct in picture timing SEI message

     */

    SEI_PicStructType sei_pic_struct;

    /**

     * Complement sei_pic_struct

     * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.

     * However, soft telecined frames may have these values.

     * This is used in an attempt to flag soft telecine progressive.

     */

    int prev_interlaced_frame;

    /**

     * Bit set of clock types for fields/frames in picture timing SEI message.

     * For each found ct_type, appropriate bit is set (e.g., bit 1 for

     * interlaced).

     */

    int sei_ct_type;

    /**

     * dpb_output_delay in picture timing SEI message, see H.264 C.2.2

     */

    int sei_dpb_output_delay;

    /**

     * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2

     */

    int sei_cpb_removal_delay;

    /**

     * recovery_frame_cnt from SEI message

     *

     * Set to -1 if no recovery point SEI message found or to number of frames

     * before playback synchronizes. Frames having recovery point are key

     * frames.

     */

    int sei_recovery_frame_cnt;

    /**

     * recovery_frame is the frame_num at which the next frame should

     * be fully constructed.

     *

     * Set to -1 when not expecting a recovery point.

     */

    int recovery_frame;

    /**

     * Are the SEI recovery points looking valid.

     */

    int valid_recovery_point;

    FPA sei_fpa;

    int luma_weight_flag[2];    ///< 7.4.3.2 luma_weight_lX_flag

    int chroma_weight_flag[2];  ///< 7.4.3.2 chroma_weight_lX_flag

    // Timestamp stuff

    int sei_buffering_period_present;   ///< Buffering period SEI flag

    int initial_cpb_removal_delay[32];  ///< Initial timestamps for CPBs

    int cur_chroma_format_idc;

    uint8_t *bipred_scratchpad;

    int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low

    int sync;                      ///< did we had a keyframe or recovery point

    uint8_t parse_history[4];

    int parse_history_count;

    int parse_last_mb;

    uint8_t *edge_emu_buffer;

    int16_t *dc_val_base;

    uint8_t *visualization_buffer[3]; ///< temporary buffer vor MV visualization

    AVBufferPool *qscale_table_pool;

    AVBufferPool *mb_type_pool;

    AVBufferPool *motion_val_pool;

    AVBufferPool *ref_index_pool;

} H264Context;

extern const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1]; ///< One chroma qp table for each possible bit depth (8-14).

extern const uint16_t ff_h264_mb_sizes[4];

/**

 * Decode SEI

 */

int ff_h264_decode_sei(H264Context *h);

/**

 * Decode SPS

 */

int ff_h264_decode_seq_parameter_set(H264Context *h);

/**

 * compute profile from sps

 */

int ff_h264_get_profile(SPS *sps);

/**

 * Decode PPS

 */

int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);

/**

 * Decode a network abstraction layer unit.

 * @param consumed is the number of bytes used as input

 * @param length is the length of the array

 * @param dst_length is the number of decoded bytes FIXME here

 *                   or a decode rbsp tailing?

 * @return decoded bytes, might be src+1 if no escapes

 */

const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,

                                  int *dst_length, int *consumed, int length);

/**

 * Free any data that may have been allocated in the H264 context

 * like SPS, PPS etc.

 */

void ff_h264_free_context(H264Context *h);

/**

 * Reconstruct bitstream slice_type.

 */

int ff_h264_get_slice_type(const H264Context *h);

/**

 * Allocate tables.

 * needs width/height

 */

int ff_h264_alloc_tables(H264Context *h);

/**

 * Fill the default_ref_list.

 */

int ff_h264_fill_default_ref_list(H264Context *h);

int ff_h264_decode_ref_pic_list_reordering(H264Context *h);

void ff_h264_fill_mbaff_ref_list(H264Context *h);

void ff_h264_remove_all_refs(H264Context *h);

/**

 * Execute the reference picture marking (memory management control operations).

 */

int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count);

int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,

                                   int first_slice);

int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice);

/**

 * Check if the top & left blocks are available if needed & change the

 * dc mode so it only uses the available blocks.

 */

int ff_h264_check_intra4x4_pred_mode(H264Context *h);

/**

 * Check if the top & left blocks are available if needed & change the

 * dc mode so it only uses the available blocks.

 */

int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma);

void ff_h264_hl_decode_mb(H264Context *h);

int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size);

int ff_h264_decode_init(AVCodecContext *avctx);

void ff_h264_decode_init_vlc(void);

/**

 * Decode a macroblock

 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error

 */

int ff_h264_decode_mb_cavlc(H264Context *h);

/**

 * Decode a CABAC coded macroblock

 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error

 */

int ff_h264_decode_mb_cabac(H264Context *h);

void ff_h264_init_cabac_states(H264Context *h);

void ff_h264_direct_dist_scale_factor(H264Context *const h);

void ff_h264_direct_ref_list_init(H264Context *const h);

void ff_h264_pred_direct_motion(H264Context *const h, int *mb_type);

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);

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);

/**

 * Reset SEI values at the beginning of the frame.

 *

 * @param h H.264 context.

 */

void ff_h264_reset_sei(H264Context *h);

/**

 * Get stereo_mode string from the h264 frame_packing_arrangement

 * @param h H.264 context.

 */

const char* ff_h264_sei_stereo_mode(H264Context *h);

/*

 * o-o o-o

 *  / / /

 * o-o o-o

 *  ,---'

 * o-o o-o

 *  / / /

 * o-o o-o

 */

/* Scan8 organization:

 *    0 1 2 3 4 5 6 7

 * 0  DY    y y y y y

 * 1        y Y Y Y Y

 * 2        y Y Y Y Y

 * 3        y Y Y Y Y

 * 4        y Y Y Y Y

 * 5  DU    u u u u u

 * 6        u U U U U

 * 7        u U U U U

 * 8        u U U U U

 * 9        u U U U U

 * 10 DV    v v v v v

 * 11       v V V V V

 * 12       v V V V V

 * 13       v V V V V

 * 14       v V V V V

 * DY/DU/DV are for luma/chroma DC.

 */

#define LUMA_DC_BLOCK_INDEX   48

#define CHROMA_DC_BLOCK_INDEX 49

// This table must be here because scan8[constant] must be known at compiletime

static const uint8_t scan8[16 * 3 + 3] = {

    4 +  1 * 8, 5 +  1 * 8, 4 +  2 * 8, 5 +  2 * 8,

    6 +  1 * 8, 7 +  1 * 8, 6 +  2 * 8, 7 +  2 * 8,

    4 +  3 * 8, 5 +  3 * 8, 4 +  4 * 8, 5 +  4 * 8,

    6 +  3 * 8, 7 +  3 * 8, 6 +  4 * 8, 7 +  4 * 8,

    4 +  6 * 8, 5 +  6 * 8, 4 +  7 * 8, 5 +  7 * 8,

    6 +  6 * 8, 7 +  6 * 8, 6 +  7 * 8, 7 +  7 * 8,

    4 +  8 * 8, 5 +  8 * 8, 4 +  9 * 8, 5 +  9 * 8,

    6 +  8 * 8, 7 +  8 * 8, 6 +  9 * 8, 7 +  9 * 8,

    4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,

    6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,

    4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,

    6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,

};

static av_always_inline uint32_t pack16to32(int a, int b)

{

#if HAVE_BIGENDIAN

    return (b & 0xFFFF) + (a << 16);

#else

    return (a & 0xFFFF) + (b << 16);

#endif

}

static av_always_inline uint16_t pack8to16(int a, int b)

{

#if HAVE_BIGENDIAN

    return (b & 0xFF) + (a << 8);

#else

    return (a & 0xFF) + (b << 8);

#endif

}

/**

 * Get the chroma qp.

 */

static av_always_inline int get_chroma_qp(H264Context *h, int t, int qscale)

{

    return h->pps.chroma_qp_table[t][qscale];

}

/**

 * Get the predicted intra4x4 prediction mode.

 */

static av_always_inline int pred_intra_mode(H264Context *h, int n)

{

    const int index8 = scan8[n];

    const int left   = h->intra4x4_pred_mode_cache[index8 - 1];

    const int top    = h->intra4x4_pred_mode_cache[index8 - 8];

    const int min    = FFMIN(left, top);

    tprintf(h->avctx, "mode:%d %d min:%d\n", left, top, min);

    if (min < 0)

        return DC_PRED;

    else

        return min;

}

static av_always_inline void write_back_intra_pred_mode(H264Context *h)

{

    int8_t *i4x4       = h->intra4x4_pred_mode + h->mb2br_xy[h->mb_xy];

    int8_t *i4x4_cache = h->intra4x4_pred_mode_cache;

    AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);

    i4x4[4] = i4x4_cache[7 + 8 * 3];

    i4x4[5] = i4x4_cache[7 + 8 * 2];

    i4x4[6] = i4x4_cache[7 + 8 * 1];

}

static av_always_inline void write_back_non_zero_count(H264Context *h)

{

    const int mb_xy    = h->mb_xy;

    uint8_t *nnz       = h->non_zero_count[mb_xy];

    uint8_t *nnz_cache = h->non_zero_count_cache;

    AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);

    AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);

    AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);

    AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);

    AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);

    AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);

    AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);

    AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);

    if (!h->chroma_y_shift) {

        AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);

        AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);

        AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);

        AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);

    }

}

static av_always_inline void write_back_motion_list(H264Context *h,

                                                    int b_stride,

                                                    int b_xy, int b8_xy,

                                                    int mb_type, int list)

{

    int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];

    int16_t(*mv_src)[2] = &h->mv_cache[list][scan8[0]];

    AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);

    AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);

    AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);

    AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);

    if (CABAC(h)) {

        uint8_t (*mvd_dst)[2] = &h->mvd_table[list][FMO ? 8 * h->mb_xy

                                                        : h->mb2br_xy[h->mb_xy]];

        uint8_t(*mvd_src)[2]  = &h->mvd_cache[list][scan8[0]];

        if (IS_SKIP(mb_type)) {

            AV_ZERO128(mvd_dst);

        } else {

            AV_COPY64(mvd_dst, mvd_src + 8 * 3);

            AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);

            AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);

            AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);

        }

    }

    {

        int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];

        int8_t *ref_cache = h->ref_cache[list];

        ref_index[0 + 0 * 2] = ref_cache[scan8[0]];

        ref_index[1 + 0 * 2] = ref_cache[scan8[4]];

        ref_index[0 + 1 * 2] = ref_cache[scan8[8]];

        ref_index[1 + 1 * 2] = ref_cache[scan8[12]];

    }

}

static av_always_inline void write_back_motion(H264Context *h, int mb_type)

{

    const int b_stride      = h->b_stride;

    const int b_xy  = 4 * h->mb_x + 4 * h->mb_y * h->b_stride; // try mb2b(8)_xy

    const int b8_xy = 4 * h->mb_xy;

    if (USES_LIST(mb_type, 0)) {

        write_back_motion_list(h, b_stride, b_xy, b8_xy, mb_type, 0);

    } else {

        fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],

                       2, 2, 2, (uint8_t)LIST_NOT_USED, 1);

    }

    if (USES_LIST(mb_type, 1))

        write_back_motion_list(h, b_stride, b_xy, b8_xy, mb_type, 1);

    if (h->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {

        if (IS_8X8(mb_type)) {

            uint8_t *direct_table = &h->direct_table[4 * h->mb_xy];

            direct_table[1] = h->sub_mb_type[1] >> 1;

            direct_table[2] = h->sub_mb_type[2] >> 1;

            direct_table[3] = h->sub_mb_type[3] >> 1;

        }

    }

}

static av_always_inline int get_dct8x8_allowed(H264Context *h)

{

    if (h->sps.direct_8x8_inference_flag)

        return !(AV_RN64A(h->sub_mb_type) &

                 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *

                  0x0001000100010001ULL));

    else

        return !(AV_RN64A(h->sub_mb_type) &

                 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *

                  0x0001000100010001ULL));

}

void ff_h264_draw_horiz_band(H264Context *h, int y, int height);

int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc);

int ff_pred_weight_table(H264Context *h);

int ff_set_ref_count(H264Context *h);

#endif /* AVCODEC_H264_H */