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/*
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 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file h264.h
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 * H.264 / AVC / MPEG4 part10 codec.
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 * @author Michael Niedermayer <michaelni@gmx.at>
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 */
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#ifndef FFMPEG_H264_H
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#define FFMPEG_H264_H
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#include "dsputil.h"
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#include "cabac.h"
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#include "mpegvideo.h"
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#include "h264pred.h"
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#define interlaced_dct interlaced_dct_is_a_bad_name
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#define mb_intra mb_intra_is_not_initialized_see_mb_type
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#define LUMA_DC_BLOCK_INDEX   25
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#define CHROMA_DC_BLOCK_INDEX 26
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#define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
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#define COEFF_TOKEN_VLC_BITS           8
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#define TOTAL_ZEROS_VLC_BITS           9
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#define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
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#define RUN_VLC_BITS                   3
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#define RUN7_VLC_BITS                  6
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#define MAX_SPS_COUNT 32
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#define MAX_PPS_COUNT 256
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#define MAX_MMCO_COUNT 66
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#define MAX_DELAYED_PIC_COUNT 16
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/* Compiling in interlaced support reduces the speed
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 * of progressive decoding by about 2%. */
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#define ALLOW_INTERLACE
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#ifdef ALLOW_INTERLACE
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#define MB_MBAFF h->mb_mbaff
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#define MB_FIELD h->mb_field_decoding_flag
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#define FRAME_MBAFF h->mb_aff_frame
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#define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
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#else
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#define MB_MBAFF 0
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#define MB_FIELD 0
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#define FRAME_MBAFF 0
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#define FIELD_PICTURE 0
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#undef  IS_INTERLACED
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#define IS_INTERLACED(mb_type) 0
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#endif
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#define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
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#ifndef ENABLE_H264_ENCODER
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#define ENABLE_H264_ENCODER 0
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#endif
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/**
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 * Sequence parameter set
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 */
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typedef struct SPS{
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    int profile_idc;
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    int level_idc;
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    int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
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    int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
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    int poc_type;                      ///< pic_order_cnt_type
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    int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
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    int delta_pic_order_always_zero_flag;
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    int offset_for_non_ref_pic;
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    int offset_for_top_to_bottom_field;
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    int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
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    int ref_frame_count;               ///< num_ref_frames
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    int gaps_in_frame_num_allowed_flag;
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    int mb_width;                      ///< pic_width_in_mbs_minus1 + 1
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    int mb_height;                     ///< pic_height_in_map_units_minus1 + 1
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    int frame_mbs_only_flag;
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    int mb_aff;                        ///<mb_adaptive_frame_field_flag
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    int direct_8x8_inference_flag;
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    int crop;                   ///< frame_cropping_flag
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    unsigned int crop_left;            ///< frame_cropping_rect_left_offset
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    unsigned int crop_right;           ///< frame_cropping_rect_right_offset
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    unsigned int crop_top;             ///< frame_cropping_rect_top_offset
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    unsigned int crop_bottom;          ///< frame_cropping_rect_bottom_offset
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    int vui_parameters_present_flag;
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    AVRational sar;
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    int timing_info_present_flag;
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    uint32_t num_units_in_tick;
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    uint32_t time_scale;
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    int fixed_frame_rate_flag;
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    short offset_for_ref_frame[256]; //FIXME dyn aloc?
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    int bitstream_restriction_flag;
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    int num_reorder_frames;
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    int scaling_matrix_present;
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    uint8_t scaling_matrix4[6][16];
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    uint8_t scaling_matrix8[2][64];
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}SPS;
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/**
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 * Picture parameter set
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 */
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typedef struct PPS{
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    unsigned int sps_id;
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    int cabac;                  ///< entropy_coding_mode_flag
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    int pic_order_present;      ///< pic_order_present_flag
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    int slice_group_count;      ///< num_slice_groups_minus1 + 1
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    int mb_slice_group_map_type;
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    unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
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    int weighted_pred;          ///< weighted_pred_flag
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    int weighted_bipred_idc;
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    int init_qp;                ///< pic_init_qp_minus26 + 26
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    int init_qs;                ///< pic_init_qs_minus26 + 26
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    int chroma_qp_index_offset[2];
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    int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
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    int constrained_intra_pred; ///< constrained_intra_pred_flag
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    int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
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    int transform_8x8_mode;     ///< transform_8x8_mode_flag
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    uint8_t scaling_matrix4[6][16];
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    uint8_t scaling_matrix8[2][64];
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    uint8_t chroma_qp_table[2][64];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
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    int chroma_qp_diff;
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}PPS;
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/**
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 * Memory management control operation opcode.
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 */
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typedef enum MMCOOpcode{
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    MMCO_END=0,
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    MMCO_SHORT2UNUSED,
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    MMCO_LONG2UNUSED,
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    MMCO_SHORT2LONG,
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    MMCO_SET_MAX_LONG,
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    MMCO_RESET,
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    MMCO_LONG,
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} MMCOOpcode;
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/**
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 * Memory management control operation.
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 */
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typedef struct MMCO{
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    MMCOOpcode opcode;
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    int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)
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    int long_arg;       ///< index, pic_num, or num long refs depending on opcode
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} MMCO;
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/**
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 * H264Context
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 */
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typedef struct H264Context{
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    MpegEncContext s;
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    int nal_ref_idc;
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    int nal_unit_type;
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    uint8_t *rbsp_buffer[2];
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    unsigned int rbsp_buffer_size[2];
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    /**
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      * Used to parse AVC variant of h264
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      */
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    int is_avc; ///< this flag is != 0 if codec is avc1
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    int got_avcC; ///< flag used to parse avcC data only once
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    int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
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    int chroma_qp[2]; //QPc
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    int prev_mb_skipped;
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    int next_mb_skipped;
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    //prediction stuff
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    int chroma_pred_mode;
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    int intra16x16_pred_mode;
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    int top_mb_xy;
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    int left_mb_xy[2];
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    int8_t intra4x4_pred_mode_cache[5*8];
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    int8_t (*intra4x4_pred_mode)[8];
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    H264PredContext hpc;
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    unsigned int topleft_samples_available;
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    unsigned int top_samples_available;
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    unsigned int topright_samples_available;
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    unsigned int left_samples_available;
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    uint8_t (*top_borders[2])[16+2*8];
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    uint8_t left_border[2*(17+2*9)];
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    /**
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     * non zero coeff count cache.
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     * is 64 if not available.
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     */
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    DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
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    uint8_t (*non_zero_count)[16];
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    /**
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     * Motion vector cache.
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     */
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    DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
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    DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
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#define LIST_NOT_USED -1 //FIXME rename?
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#define PART_NOT_AVAILABLE -2
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    /**
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     * is 1 if the specific list MV&references are set to 0,0,-2.
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     */
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    int mv_cache_clean[2];
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    /**
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     * number of neighbors (top and/or left) that used 8x8 dct
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     */
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    int neighbor_transform_size;
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    /**
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     * block_offset[ 0..23] for frame macroblocks
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     * block_offset[24..47] for field macroblocks
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     */
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    int block_offset[2*(16+8)];
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    uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
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    uint32_t *mb2b8_xy;
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    int b_stride; //FIXME use s->b4_stride
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    int b8_stride;
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    int mb_linesize;   ///< may be equal to s->linesize or s->linesize*2, for mbaff
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    int mb_uvlinesize;
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    int emu_edge_width;
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    int emu_edge_height;
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    int halfpel_flag;
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    int thirdpel_flag;
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    int unknown_svq3_flag;
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    int next_slice_index;
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    SPS *sps_buffers[MAX_SPS_COUNT];
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    SPS sps; ///< current sps
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    PPS *pps_buffers[MAX_PPS_COUNT];
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    /**
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     * current pps
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     */
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    PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
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    uint32_t dequant4_buffer[6][52][16];
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    uint32_t dequant8_buffer[2][52][64];
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    uint32_t (*dequant4_coeff[6])[16];
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    uint32_t (*dequant8_coeff[2])[64];
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    int dequant_coeff_pps;     ///< reinit tables when pps changes
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    int slice_num;
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    uint8_t *slice_table_base;
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    uint8_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1
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    int slice_type;
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    int slice_type_nos;        ///< S free slice type (SI/SP are remapped to I/P)
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    int slice_type_fixed;
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    //interlacing specific flags
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    int mb_aff_frame;
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    int mb_field_decoding_flag;
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    int mb_mbaff;              ///< mb_aff_frame && mb_field_decoding_flag
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    unsigned int sub_mb_type[4];
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    //POC stuff
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    int poc_lsb;
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    int poc_msb;
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    int delta_poc_bottom;
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    int delta_poc[2];
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    int frame_num;
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    int prev_poc_msb;             ///< poc_msb of the last reference pic for POC type 0
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    int prev_poc_lsb;             ///< poc_lsb of the last reference pic for POC type 0
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    int frame_num_offset;         ///< for POC type 2
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    int prev_frame_num_offset;    ///< for POC type 2
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    int prev_frame_num;           ///< frame_num of the last pic for POC type 1/2
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    /**
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     * frame_num for frames or 2*frame_num+1 for field pics.
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     */
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    int curr_pic_num;
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    /**
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     * max_frame_num or 2*max_frame_num for field pics.
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     */
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    int max_pic_num;
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    //Weighted pred stuff
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    int use_weight;
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    int use_weight_chroma;
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    int luma_log2_weight_denom;
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    int chroma_log2_weight_denom;
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    int luma_weight[2][48];
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    int luma_offset[2][48];
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    int chroma_weight[2][48][2];
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    int chroma_offset[2][48][2];
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    int implicit_weight[48][48];
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    //deblock
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    int deblocking_filter;         ///< disable_deblocking_filter_idc with 1<->0
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    int slice_alpha_c0_offset;
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    int slice_beta_offset;
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    int redundant_pic_count;
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    int direct_spatial_mv_pred;
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    int dist_scale_factor[16];
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    int dist_scale_factor_field[32];
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    int map_col_to_list0[2][16];
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    int map_col_to_list0_field[2][32];
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    /**
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     * num_ref_idx_l0/1_active_minus1 + 1
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     */
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    unsigned int ref_count[2];   ///< counts frames or fields, depending on current mb mode
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    unsigned int list_count;
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    Picture *short_ref[32];
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    Picture *long_ref[32];
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    Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
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    Picture ref_list[2][48];         /**< 0..15: frame refs, 16..47: mbaff field refs.
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                                          Reordered version of default_ref_list
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                                          according to picture reordering in slice header */
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    int ref2frm[16][2][48+2];            ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
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    Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
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    int outputed_poc;
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    /**
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     * memory management control operations buffer.
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     */
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    MMCO mmco[MAX_MMCO_COUNT];
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    int mmco_index;
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    int long_ref_count;  ///< number of actual long term references
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    int short_ref_count; ///< number of actual short term references
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    //data partitioning
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    GetBitContext intra_gb;
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    GetBitContext inter_gb;
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    GetBitContext *intra_gb_ptr;
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    GetBitContext *inter_gb_ptr;
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    DECLARE_ALIGNED_16(DCTELEM, mb[16*24]);
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    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
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    /**
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     * Cabac
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     */
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    CABACContext cabac;
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    uint8_t      cabac_state[460];
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    int          cabac_init_idc;
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    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
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    uint16_t     *cbp_table;
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    int cbp;
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    int top_cbp;
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    int left_cbp;
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    /* chroma_pred_mode for i4x4 or i16x16, else 0 */
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    uint8_t     *chroma_pred_mode_table;
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    int         last_qscale_diff;
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    int16_t     (*mvd_table[2])[2];
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    DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
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    uint8_t     *direct_table;
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    uint8_t     direct_cache[5*8];
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    uint8_t zigzag_scan[16];
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    uint8_t zigzag_scan8x8[64];
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    uint8_t zigzag_scan8x8_cavlc[64];
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    uint8_t field_scan[16];
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    uint8_t field_scan8x8[64];
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    uint8_t field_scan8x8_cavlc[64];
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    const uint8_t *zigzag_scan_q0;
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    const uint8_t *zigzag_scan8x8_q0;
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    const uint8_t *zigzag_scan8x8_cavlc_q0;
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    const uint8_t *field_scan_q0;
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    const uint8_t *field_scan8x8_q0;
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    const uint8_t *field_scan8x8_cavlc_q0;
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    int x264_build;
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    /**
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     * @defgroup multithreading Members for slice based multithreading
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     * @{
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     */
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    struct H264Context *thread_context[MAX_THREADS];
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    /**
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     * current slice number, used to initalize slice_num of each thread/context
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     */
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    int current_slice;
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    /**
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     * Max number of threads / contexts.
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     * This is equal to AVCodecContext.thread_count unless
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     * multithreaded decoding is impossible, in which case it is
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     * reduced to 1.
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     */
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    int max_contexts;
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    /**
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     *  1 if the single thread fallback warning has already been
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     *  displayed, 0 otherwise.
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     */
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    int single_decode_warning;
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    int last_slice_type;
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    /** @} */
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    int mb_xy;
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}H264Context;
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#endif /* FFMPEG_H264_H */