av1_common_int.h

/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */
 
#ifndef AOM_AV1_COMMON_AV1_COMMON_INT_H_
#define AOM_AV1_COMMON_AV1_COMMON_INT_H_
 
#include "config/aom_config.h"
#include "config/av1_rtcd.h"
 
#include "aom/internal/aom_codec_internal.h"
#include "aom_util/aom_thread.h"
#include "av1/common/alloccommon.h"
#include "av1/common/av1_loopfilter.h"
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
#include "av1/common/entropymv.h"
#include "av1/common/enums.h"
#include "av1/common/frame_buffers.h"
#include "av1/common/mv.h"
#include "av1/common/quant_common.h"
#include "av1/common/restoration.h"
#include "av1/common/tile_common.h"
#include "av1/common/timing.h"
#include "av1/common/odintrin.h"
#include "av1/encoder/hash_motion.h"
#include "aom_dsp/grain_synthesis.h"
#include "aom_dsp/grain_table.h"
#ifdef __cplusplus
extern "C" {
#endif
 
#if defined(__clang__) && defined(__has_warning)
#if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
#define AOM_FALLTHROUGH_INTENDED [[clang::fallthrough]]  // NOLINT
#endif
#elif defined(__GNUC__) && __GNUC__ >= 7
#define AOM_FALLTHROUGH_INTENDED __attribute__((fallthrough))  // NOLINT
#endif
 
#ifndef AOM_FALLTHROUGH_INTENDED
#define AOM_FALLTHROUGH_INTENDED \
  do {                           \
  } while (0)
#endif
 
#define CDEF_MAX_STRENGTHS 16
 
/* Constant values while waiting for the sequence header */
#define FRAME_ID_LENGTH 15
#define DELTA_FRAME_ID_LENGTH 14
 
#define FRAME_CONTEXTS (FRAME_BUFFERS + 1)
// Extra frame context which is always kept at default values
#define FRAME_CONTEXT_DEFAULTS (FRAME_CONTEXTS - 1)
#define PRIMARY_REF_BITS 3
#define PRIMARY_REF_NONE 7
 
#define NUM_PING_PONG_BUFFERS 2
 
#define MAX_NUM_TEMPORAL_LAYERS 8
#define MAX_NUM_SPATIAL_LAYERS 4
/* clang-format off */
// clang-format seems to think this is a pointer dereference and not a
// multiplication.
#define MAX_NUM_OPERATING_POINTS \
  (MAX_NUM_TEMPORAL_LAYERS * MAX_NUM_SPATIAL_LAYERS)
/* clang-format on */
 
// TODO(jingning): Turning this on to set up transform coefficient
// processing timer.
#define TXCOEFF_TIMER 0
#define TXCOEFF_COST_TIMER 0

 
enum {
  SINGLE_REFERENCE = 0,
  COMPOUND_REFERENCE = 1,
  REFERENCE_MODE_SELECT = 2,
  REFERENCE_MODES = 3,
} UENUM1BYTE(REFERENCE_MODE);
 
enum {
  REFRESH_FRAME_CONTEXT_DISABLED,
  REFRESH_FRAME_CONTEXT_BACKWARD,
} UENUM1BYTE(REFRESH_FRAME_CONTEXT_MODE);
 
#define MFMV_STACK_SIZE 3
typedef struct {
  int_mv mfmv0;
  uint8_t ref_frame_offset;
} TPL_MV_REF;
 
typedef struct {
  int_mv mv;
  MV_REFERENCE_FRAME ref_frame;
} MV_REF;
 
typedef struct RefCntBuffer {
  // For a RefCntBuffer, the following are reference-holding variables:
  // - cm->ref_frame_map[]
  // - cm->cur_frame
  // - cm->scaled_ref_buf[] (encoder only)
  // - pbi->output_frame_index[] (decoder only)
  // With that definition, 'ref_count' is the number of reference-holding
  // variables that are currently referencing this buffer.
  // For example:
  // - suppose this buffer is at index 'k' in the buffer pool, and
  // - Total 'n' of the variables / array elements above have value 'k' (that
  // is, they are pointing to buffer at index 'k').
  // Then, pool->frame_bufs[k].ref_count = n.
  int ref_count;
 
  unsigned int order_hint;
  unsigned int ref_order_hints[INTER_REFS_PER_FRAME];
 
  // These variables are used only in encoder and compare the absolute
  // display order hint to compute the relative distance and overcome
  // the limitation of get_relative_dist() which returns incorrect
  // distance when a very old frame is used as a reference.
  unsigned int display_order_hint;
  unsigned int ref_display_order_hint[INTER_REFS_PER_FRAME];
 
  MV_REF *mvs;
  uint8_t *seg_map;
  struct segmentation seg;
  int mi_rows;
  int mi_cols;
  // Width and height give the size of the buffer (before any upscaling, unlike
  // the sizes that can be derived from the buf structure)
  int width;
  int height;
  WarpedMotionParams global_motion[REF_FRAMES];
  int showable_frame;  // frame can be used as show existing frame in future
  uint8_t film_grain_params_present;
  aom_film_grain_t film_grain_params;
  aom_codec_frame_buffer_t raw_frame_buffer;
  YV12_BUFFER_CONFIG buf;
  FRAME_TYPE frame_type;
 
  // This is only used in the encoder but needs to be indexed per ref frame
  // so it's extremely convenient to keep it here.
  int interp_filter_selected[SWITCHABLE];
 
  // Inter frame reference frame delta for loop filter
  int8_t ref_deltas[REF_FRAMES];
 
  // 0 = ZERO_MV, MV
  int8_t mode_deltas[MAX_MODE_LF_DELTAS];
 
  FRAME_CONTEXT frame_context;
} RefCntBuffer;
 
typedef struct BufferPool {
// Protect BufferPool from being accessed by several FrameWorkers at
// the same time during frame parallel decode.
// TODO(hkuang): Try to use atomic variable instead of locking the whole pool.
// TODO(wtc): Remove this. See
// https://chromium-review.googlesource.com/c/webm/libvpx/+/560630.
#if CONFIG_MULTITHREAD
  pthread_mutex_t pool_mutex;
#endif
 
  // Private data associated with the frame buffer callbacks.
  void *cb_priv;
 
  aom_get_frame_buffer_cb_fn_t get_fb_cb;
  aom_release_frame_buffer_cb_fn_t release_fb_cb;
 
  RefCntBuffer frame_bufs[FRAME_BUFFERS];
 
  // Frame buffers allocated internally by the codec.
  InternalFrameBufferList int_frame_buffers;
} BufferPool;


typedef struct {
  int cdef_damping;                       
  int nb_cdef_strengths;                  
  int cdef_strengths[CDEF_MAX_STRENGTHS]; 
  int cdef_uv_strengths[CDEF_MAX_STRENGTHS]; 
  int cdef_bits; 
} CdefInfo;

 
typedef struct {
  int delta_q_present_flag;
  // Resolution of delta quant
  int delta_q_res;
  int delta_lf_present_flag;
  // Resolution of delta lf level
  int delta_lf_res;
  // This is a flag for number of deltas of loop filter level
  // 0: use 1 delta, for y_vertical, y_horizontal, u, and v
  // 1: use separate deltas for each filter level
  int delta_lf_multi;
} DeltaQInfo;
 
typedef struct {
  int enable_order_hint;        // 0 - disable order hint, and related tools
  int order_hint_bits_minus_1;  // dist_wtd_comp, ref_frame_mvs,
                                // frame_sign_bias
                                // if 0, enable_dist_wtd_comp and
                                // enable_ref_frame_mvs must be set as 0.
  int enable_dist_wtd_comp;     // 0 - disable dist-wtd compound modes
                                // 1 - enable it
  int enable_ref_frame_mvs;     // 0 - disable ref frame mvs
                                // 1 - enable it
} OrderHintInfo;
 
// Sequence header structure.
// Note: All syntax elements of sequence_header_obu that need to be
// bit-identical across multiple sequence headers must be part of this struct,
// so that consistency is checked by are_seq_headers_consistent() function.
// One exception is the last member 'op_params' that is ignored by
// are_seq_headers_consistent() function.
typedef struct SequenceHeader {
  int num_bits_width;
  int num_bits_height;
  int max_frame_width;
  int max_frame_height;
  // Whether current and reference frame IDs are signaled in the bitstream.
  // Frame id numbers are additional information that do not affect the
  // decoding process, but provide decoders with a way of detecting missing
  // reference frames so that appropriate action can be taken.
  uint8_t frame_id_numbers_present_flag;
  int frame_id_length;
  int delta_frame_id_length;
  BLOCK_SIZE sb_size;  // Size of the superblock used for this frame
  int mib_size;        // Size of the superblock in units of MI blocks
  int mib_size_log2;   // Log 2 of above.
 
  OrderHintInfo order_hint_info;
 
  uint8_t force_screen_content_tools;  // 0 - force off
                                       // 1 - force on
                                       // 2 - adaptive
  uint8_t still_picture;               // Video is a single frame still picture
  uint8_t reduced_still_picture_hdr;   // Use reduced header for still picture
  uint8_t force_integer_mv;            // 0 - Don't force. MV can use subpel
                                       // 1 - force to integer
                                       // 2 - adaptive
  uint8_t enable_filter_intra;         // enables/disables filterintra
  uint8_t enable_intra_edge_filter;    // enables/disables edge upsampling
  uint8_t enable_interintra_compound;  // enables/disables interintra_compound
  uint8_t enable_masked_compound;      // enables/disables masked compound
  uint8_t enable_dual_filter;          // 0 - disable dual interpolation filter
                                       // 1 - enable vert/horz filter selection
  uint8_t enable_warped_motion;        // 0 - disable warp for the sequence
                                       // 1 - enable warp for the sequence
  uint8_t enable_superres;             // 0 - Disable superres for the sequence
                                       //     and no frame level superres flag
                                       // 1 - Enable superres for the sequence
                                       //     enable per-frame superres flag
  uint8_t enable_cdef;                 // To turn on/off CDEF
  uint8_t enable_restoration;          // To turn on/off loop restoration
  BITSTREAM_PROFILE profile;
 
  // Color config.
  aom_bit_depth_t bit_depth;  // AOM_BITS_8 in profile 0 or 1,
                              // AOM_BITS_10 or AOM_BITS_12 in profile 2 or 3.
  uint8_t use_highbitdepth;   // If true, we need to use 16bit frame buffers.
  uint8_t monochrome;         // Monochorme video
  aom_color_primaries_t color_primaries;
  aom_transfer_characteristics_t transfer_characteristics;
  aom_matrix_coefficients_t matrix_coefficients;
  int color_range;
  int subsampling_x;  // Chroma subsampling for x
  int subsampling_y;  // Chroma subsampling for y
  aom_chroma_sample_position_t chroma_sample_position;
  uint8_t separate_uv_delta_q;
  uint8_t film_grain_params_present;
 
  // Operating point info.
  int operating_points_cnt_minus_1;
  int operating_point_idc[MAX_NUM_OPERATING_POINTS];
  int timing_info_present;
  aom_timing_info_t timing_info;
  uint8_t decoder_model_info_present_flag;
  aom_dec_model_info_t decoder_model_info;
  uint8_t display_model_info_present_flag;
  AV1_LEVEL seq_level_idx[MAX_NUM_OPERATING_POINTS];
  uint8_t tier[MAX_NUM_OPERATING_POINTS];  // seq_tier in spec. One bit: 0 or 1.
 
  // IMPORTANT: the op_params member must be at the end of the struct so that
  // are_seq_headers_consistent() can be implemented with a memcmp() call.
  // TODO(urvang): We probably don't need the +1 here.
  aom_dec_model_op_parameters_t op_params[MAX_NUM_OPERATING_POINTS + 1];
} SequenceHeader;
 
typedef struct {
  int skip_mode_allowed;
  int skip_mode_flag;
  int ref_frame_idx_0;
  int ref_frame_idx_1;
} SkipModeInfo;
 
typedef struct {
  FRAME_TYPE frame_type;
  REFERENCE_MODE reference_mode;
 
  unsigned int order_hint;
  unsigned int display_order_hint;
  unsigned int frame_number;
  SkipModeInfo skip_mode_info;
  int refresh_frame_flags;  // Which ref frames are overwritten by this frame
  int frame_refs_short_signaling;
} CurrentFrame;


typedef struct {
  bool disable_cdf_update;
  bool allow_high_precision_mv;
  bool cur_frame_force_integer_mv;
  bool allow_screen_content_tools;
  bool allow_intrabc;       
  bool allow_warped_motion; 
  bool allow_ref_frame_mvs;
  bool coded_lossless;
  bool all_lossless;
  bool reduced_tx_set_used;
  bool error_resilient_mode;
  bool switchable_motion_mode;
  TX_MODE tx_mode;            
  InterpFilter interp_filter; 
  int primary_ref_frame;
  int byte_alignment;
  REFRESH_FRAME_CONTEXT_MODE refresh_frame_context;
} FeatureFlags;

typedef struct CommonTileParams {
  int cols;          
  int rows;          
  int max_width_sb;  
  int max_height_sb; 

  int min_inner_width;

  int uniform_spacing;

  int log2_cols; 
  int log2_rows; 
  int width;     
  int height;    

  int min_log2_cols;
  int min_log2_rows;
  int max_log2_cols;
  int max_log2_rows;
  int min_log2;
  int col_start_sb[MAX_TILE_COLS + 1];
  int row_start_sb[MAX_TILE_ROWS + 1];
  unsigned int large_scale;
  unsigned int single_tile_decoding;
} CommonTileParams;
 
typedef struct CommonModeInfoParams CommonModeInfoParams;
struct CommonModeInfoParams {
  int mb_rows;
  int mb_cols;

  int MBs;

  int mi_rows;
  int mi_cols;

  MB_MODE_INFO *mi_alloc;
  int mi_alloc_size;
  int mi_alloc_stride;
  BLOCK_SIZE mi_alloc_bsize;

  MB_MODE_INFO **mi_grid_base;
  int mi_grid_size;
  int mi_stride;

  TX_TYPE *tx_type_map;

  void (*free_mi)(struct CommonModeInfoParams *mi_params);
  void (*setup_mi)(struct CommonModeInfoParams *mi_params);
  void (*set_mb_mi)(struct CommonModeInfoParams *mi_params, int width,
                    int height);
};
 
typedef struct CommonQuantParams CommonQuantParams;
struct CommonQuantParams {
  int base_qindex;

  int y_dc_delta_q;

  int u_dc_delta_q;
  int v_dc_delta_q;

  int u_ac_delta_q;
  int v_ac_delta_q;
 
  /*
   * Note: The qindex per superblock may have a delta from the qindex obtained
   * at frame level from parameters above, based on 'cm->delta_q_info'.
   */

  int16_t y_dequant_QTX[MAX_SEGMENTS][2]; 
  int16_t u_dequant_QTX[MAX_SEGMENTS][2]; 
  int16_t v_dequant_QTX[MAX_SEGMENTS][2]; 

  const qm_val_t *giqmatrix[NUM_QM_LEVELS][3][TX_SIZES_ALL];
  const qm_val_t *gqmatrix[NUM_QM_LEVELS][3][TX_SIZES_ALL];

  const qm_val_t *y_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
  const qm_val_t *u_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];
  const qm_val_t *v_iqmatrix[MAX_SEGMENTS][TX_SIZES_ALL];

  bool using_qmatrix;
  int qmatrix_level_y; 
  int qmatrix_level_u; 
  int qmatrix_level_v; 
};
 
typedef struct CommonContexts CommonContexts;
struct CommonContexts {
  PARTITION_CONTEXT **partition;

  ENTROPY_CONTEXT **entropy[MAX_MB_PLANE];

  TXFM_CONTEXT **txfm;

  int num_planes;    
  int num_tile_rows; 
  int num_mi_cols;   
};

typedef struct AV1Common {
  CurrentFrame current_frame;
  struct aom_internal_error_info error;


  int width;  
  int height; 

  int render_width;  
  int render_height; 

  int superres_upscaled_width;  
  int superres_upscaled_height; 

  uint8_t superres_scale_denominator;

  bool buffer_removal_time_present;
  uint32_t buffer_removal_times[MAX_NUM_OPERATING_POINTS + 1];
  uint32_t frame_presentation_time;

  RefCntBuffer *prev_frame;

  RefCntBuffer *cur_frame;

  int remapped_ref_idx[REF_FRAMES];

  struct scale_factors sf_identity;

  struct scale_factors ref_scale_factors[REF_FRAMES];

  RefCntBuffer *ref_frame_map[REF_FRAMES];

  int show_frame;

  int showable_frame;

  int show_existing_frame;

  FeatureFlags features;

  CommonModeInfoParams mi_params;
 
#if CONFIG_ENTROPY_STATS
  int coef_cdf_category;
#endif  // CONFIG_ENTROPY_STATS

  CommonQuantParams quant_params;

  struct segmentation seg;

  uint8_t *last_frame_seg_map;

  loop_filter_info_n lf_info; 
  struct loopfilter lf;       

  RestorationInfo rst_info[MAX_MB_PLANE]; 
  int32_t *rst_tmpbuf; 
  RestorationLineBuffers *rlbs; 
  YV12_BUFFER_CONFIG rst_frame; 

  CdefInfo cdef_info;

  aom_film_grain_t film_grain_params;

  DeltaQInfo delta_q_info;

  WarpedMotionParams global_motion[REF_FRAMES];

  SequenceHeader seq_params;

  FRAME_CONTEXT *fc;
  FRAME_CONTEXT *default_frame_context;

  CommonTileParams tiles;

  BufferPool *buffer_pool;

  CommonContexts above_contexts;

  int current_frame_id;         
  int ref_frame_id[REF_FRAMES]; 

  TPL_MV_REF *tpl_mvs;
  int tpl_mvs_mem_size;
  int ref_frame_sign_bias[REF_FRAMES];
  int8_t ref_frame_side[REF_FRAMES];

  unsigned int number_temporal_layers;
  int temporal_layer_id;

  unsigned int number_spatial_layers;
  int spatial_layer_id;
 
#if TXCOEFF_TIMER
  int64_t cum_txcoeff_timer;
  int64_t txcoeff_timer;
  int txb_count;
#endif  // TXCOEFF_TIMER
 
#if TXCOEFF_COST_TIMER
  int64_t cum_txcoeff_cost_timer;
  int64_t txcoeff_cost_timer;
  int64_t txcoeff_cost_count;
#endif  // TXCOEFF_COST_TIMER
 
#if CONFIG_LPF_MASK
  int is_decoding;
#endif  // CONFIG_LPF_MASK
} AV1_COMMON;

 
// TODO(hkuang): Don't need to lock the whole pool after implementing atomic
// frame reference count.
static void lock_buffer_pool(BufferPool *const pool) {
#if CONFIG_MULTITHREAD
  pthread_mutex_lock(&pool->pool_mutex);
#else
  (void)pool;
#endif
}
 
static void unlock_buffer_pool(BufferPool *const pool) {
#if CONFIG_MULTITHREAD
  pthread_mutex_unlock(&pool->pool_mutex);
#else
  (void)pool;
#endif
}
 
static INLINE YV12_BUFFER_CONFIG *get_ref_frame(AV1_COMMON *cm, int index) {
  if (index < 0 || index >= REF_FRAMES) return NULL;
  if (cm->ref_frame_map[index] == NULL) return NULL;
  return &cm->ref_frame_map[index]->buf;
}
 
static INLINE int get_free_fb(AV1_COMMON *cm) {
  RefCntBuffer *const frame_bufs = cm->buffer_pool->frame_bufs;
  int i;
 
  lock_buffer_pool(cm->buffer_pool);
  for (i = 0; i < FRAME_BUFFERS; ++i)
    if (frame_bufs[i].ref_count == 0) break;
 
  if (i != FRAME_BUFFERS) {
    if (frame_bufs[i].buf.use_external_reference_buffers) {
      // If this frame buffer's y_buffer, u_buffer, and v_buffer point to the
      // external reference buffers. Restore the buffer pointers to point to the
      // internally allocated memory.
      YV12_BUFFER_CONFIG *ybf = &frame_bufs[i].buf;
      ybf->y_buffer = ybf->store_buf_adr[0];
      ybf->u_buffer = ybf->store_buf_adr[1];
      ybf->v_buffer = ybf->store_buf_adr[2];
      ybf->use_external_reference_buffers = 0;
    }
 
    frame_bufs[i].ref_count = 1;
  } else {
    // We should never run out of free buffers. If this assertion fails, there
    // is a reference leak.
    assert(0 && "Ran out of free frame buffers. Likely a reference leak.");
    // Reset i to be INVALID_IDX to indicate no free buffer found.
    i = INVALID_IDX;
  }
 
  unlock_buffer_pool(cm->buffer_pool);
  return i;
}
 
static INLINE RefCntBuffer *assign_cur_frame_new_fb(AV1_COMMON *const cm) {
  // Release the previously-used frame-buffer
  if (cm->cur_frame != NULL) {
    --cm->cur_frame->ref_count;
    cm->cur_frame = NULL;
  }
 
  // Assign a new framebuffer
  const int new_fb_idx = get_free_fb(cm);
  if (new_fb_idx == INVALID_IDX) return NULL;
 
  cm->cur_frame = &cm->buffer_pool->frame_bufs[new_fb_idx];
  cm->cur_frame->buf.buf_8bit_valid = 0;
  av1_zero(cm->cur_frame->interp_filter_selected);
  return cm->cur_frame;
}
 
// Modify 'lhs_ptr' to reference the buffer at 'rhs_ptr', and update the ref
// counts accordingly.
static INLINE void assign_frame_buffer_p(RefCntBuffer **lhs_ptr,
                                         RefCntBuffer *rhs_ptr) {
  RefCntBuffer *const old_ptr = *lhs_ptr;
  if (old_ptr != NULL) {
    assert(old_ptr->ref_count > 0);
    // One less reference to the buffer at 'old_ptr', so decrease ref count.
    --old_ptr->ref_count;
  }
 
  *lhs_ptr = rhs_ptr;
  // One more reference to the buffer at 'rhs_ptr', so increase ref count.
  ++rhs_ptr->ref_count;
}
 
static INLINE int frame_is_intra_only(const AV1_COMMON *const cm) {
  return cm->current_frame.frame_type == KEY_FRAME ||
         cm->current_frame.frame_type == INTRA_ONLY_FRAME;
}
 
static INLINE int frame_is_sframe(const AV1_COMMON *cm) {
  return cm->current_frame.frame_type == S_FRAME;
}
 
// These functions take a reference frame label between LAST_FRAME and
// EXTREF_FRAME inclusive.  Note that this is different to the indexing
// previously used by the frame_refs[] array.
static INLINE int get_ref_frame_map_idx(const AV1_COMMON *const cm,
                                        const MV_REFERENCE_FRAME ref_frame) {
  return (ref_frame >= LAST_FRAME && ref_frame <= EXTREF_FRAME)
             ? cm->remapped_ref_idx[ref_frame - LAST_FRAME]
             : INVALID_IDX;
}
 
static INLINE RefCntBuffer *get_ref_frame_buf(
    const AV1_COMMON *const cm, const MV_REFERENCE_FRAME ref_frame) {
  const int map_idx = get_ref_frame_map_idx(cm, ref_frame);
  return (map_idx != INVALID_IDX) ? cm->ref_frame_map[map_idx] : NULL;
}
 
// Both const and non-const versions of this function are provided so that it
// can be used with a const AV1_COMMON if needed.
static INLINE const struct scale_factors *get_ref_scale_factors_const(
    const AV1_COMMON *const cm, const MV_REFERENCE_FRAME ref_frame) {
  const int map_idx = get_ref_frame_map_idx(cm, ref_frame);
  return (map_idx != INVALID_IDX) ? &cm->ref_scale_factors[map_idx] : NULL;
}
 
static INLINE struct scale_factors *get_ref_scale_factors(
    AV1_COMMON *const cm, const MV_REFERENCE_FRAME ref_frame) {
  const int map_idx = get_ref_frame_map_idx(cm, ref_frame);
  return (map_idx != INVALID_IDX) ? &cm->ref_scale_factors[map_idx] : NULL;
}
 
static INLINE RefCntBuffer *get_primary_ref_frame_buf(
    const AV1_COMMON *const cm) {
  const int primary_ref_frame = cm->features.primary_ref_frame;
  if (primary_ref_frame == PRIMARY_REF_NONE) return NULL;
  const int map_idx = get_ref_frame_map_idx(cm, primary_ref_frame + 1);
  return (map_idx != INVALID_IDX) ? cm->ref_frame_map[map_idx] : NULL;
}
 
// Returns 1 if this frame might allow mvs from some reference frame.
static INLINE int frame_might_allow_ref_frame_mvs(const AV1_COMMON *cm) {
  return !cm->features.error_resilient_mode &&
         cm->seq_params.order_hint_info.enable_ref_frame_mvs &&
         cm->seq_params.order_hint_info.enable_order_hint &&
         !frame_is_intra_only(cm);
}
 
// Returns 1 if this frame might use warped_motion
static INLINE int frame_might_allow_warped_motion(const AV1_COMMON *cm) {
  return !cm->features.error_resilient_mode && !frame_is_intra_only(cm) &&
         cm->seq_params.enable_warped_motion;
}
 
static INLINE void ensure_mv_buffer(RefCntBuffer *buf, AV1_COMMON *cm) {
  const int buf_rows = buf->mi_rows;
  const int buf_cols = buf->mi_cols;
  const CommonModeInfoParams *const mi_params = &cm->mi_params;
 
  if (buf->mvs == NULL || buf_rows != mi_params->mi_rows ||
      buf_cols != mi_params->mi_cols) {
    aom_free(buf->mvs);
    buf->mi_rows = mi_params->mi_rows;
    buf->mi_cols = mi_params->mi_cols;
    CHECK_MEM_ERROR(cm, buf->mvs,
                    (MV_REF *)aom_calloc(((mi_params->mi_rows + 1) >> 1) *
                                             ((mi_params->mi_cols + 1) >> 1),
                                         sizeof(*buf->mvs)));
    aom_free(buf->seg_map);
    CHECK_MEM_ERROR(
        cm, buf->seg_map,
        (uint8_t *)aom_calloc(mi_params->mi_rows * mi_params->mi_cols,
                              sizeof(*buf->seg_map)));
  }
 
  const int mem_size =
      ((mi_params->mi_rows + MAX_MIB_SIZE) >> 1) * (mi_params->mi_stride >> 1);
  int realloc = cm->tpl_mvs == NULL;
  if (cm->tpl_mvs) realloc |= cm->tpl_mvs_mem_size < mem_size;
 
  if (realloc) {
    aom_free(cm->tpl_mvs);
    CHECK_MEM_ERROR(cm, cm->tpl_mvs,
                    (TPL_MV_REF *)aom_calloc(mem_size, sizeof(*cm->tpl_mvs)));
    cm->tpl_mvs_mem_size = mem_size;
  }
}
 
void cfl_init(CFL_CTX *cfl, const SequenceHeader *seq_params);
 
static INLINE int av1_num_planes(const AV1_COMMON *cm) {
  return cm->seq_params.monochrome ? 1 : MAX_MB_PLANE;
}
 
static INLINE void av1_init_above_context(CommonContexts *above_contexts,
                                          int num_planes, int tile_row,
                                          MACROBLOCKD *xd) {
  for (int i = 0; i < num_planes; ++i) {
    xd->above_entropy_context[i] = above_contexts->entropy[i][tile_row];
  }
  xd->above_partition_context = above_contexts->partition[tile_row];
  xd->above_txfm_context = above_contexts->txfm[tile_row];
}
 
static INLINE void av1_init_macroblockd(AV1_COMMON *cm, MACROBLOCKD *xd) {
  const int num_planes = av1_num_planes(cm);
  const CommonQuantParams *const quant_params = &cm->quant_params;
 
  for (int i = 0; i < num_planes; ++i) {
    if (xd->plane[i].plane_type == PLANE_TYPE_Y) {
      memcpy(xd->plane[i].seg_dequant_QTX, quant_params->y_dequant_QTX,
             sizeof(quant_params->y_dequant_QTX));
      memcpy(xd->plane[i].seg_iqmatrix, quant_params->y_iqmatrix,
             sizeof(quant_params->y_iqmatrix));
 
    } else {
      if (i == AOM_PLANE_U) {
        memcpy(xd->plane[i].seg_dequant_QTX, quant_params->u_dequant_QTX,
               sizeof(quant_params->u_dequant_QTX));
        memcpy(xd->plane[i].seg_iqmatrix, quant_params->u_iqmatrix,
               sizeof(quant_params->u_iqmatrix));
      } else {
        memcpy(xd->plane[i].seg_dequant_QTX, quant_params->v_dequant_QTX,
               sizeof(quant_params->v_dequant_QTX));
        memcpy(xd->plane[i].seg_iqmatrix, quant_params->v_iqmatrix,
               sizeof(quant_params->v_iqmatrix));
      }
    }
  }
  xd->mi_stride = cm->mi_params.mi_stride;
  xd->error_info = &cm->error;
  cfl_init(&xd->cfl, &cm->seq_params);
}
 
static INLINE void set_entropy_context(MACROBLOCKD *xd, int mi_row, int mi_col,
                                       const int num_planes) {
  int i;
  int row_offset = mi_row;
  int col_offset = mi_col;
  for (i = 0; i < num_planes; ++i) {
    struct macroblockd_plane *const pd = &xd->plane[i];
    // Offset the buffer pointer
    const BLOCK_SIZE bsize = xd->mi[0]->bsize;
    if (pd->subsampling_y && (mi_row & 0x01) && (mi_size_high[bsize] == 1))
      row_offset = mi_row - 1;
    if (pd->subsampling_x && (mi_col & 0x01) && (mi_size_wide[bsize] == 1))
      col_offset = mi_col - 1;
    int above_idx = col_offset;
    int left_idx = row_offset & MAX_MIB_MASK;
    pd->above_entropy_context =
        &xd->above_entropy_context[i][above_idx >> pd->subsampling_x];
    pd->left_entropy_context =
        &xd->left_entropy_context[i][left_idx >> pd->subsampling_y];
  }
}
 
static INLINE int calc_mi_size(int len) {
  // len is in mi units. Align to a multiple of SBs.
  return ALIGN_POWER_OF_TWO(len, MAX_MIB_SIZE_LOG2);
}
 
static INLINE void set_plane_n4(MACROBLOCKD *const xd, int bw, int bh,
                                const int num_planes) {
  int i;
  for (i = 0; i < num_planes; i++) {
    xd->plane[i].width = (bw * MI_SIZE) >> xd->plane[i].subsampling_x;
    xd->plane[i].height = (bh * MI_SIZE) >> xd->plane[i].subsampling_y;
 
    xd->plane[i].width = AOMMAX(xd->plane[i].width, 4);
    xd->plane[i].height = AOMMAX(xd->plane[i].height, 4);
  }
}
 
static INLINE void set_mi_row_col(MACROBLOCKD *xd, const TileInfo *const tile,
                                  int mi_row, int bh, int mi_col, int bw,
                                  int mi_rows, int mi_cols) {
  xd->mb_to_top_edge = -GET_MV_SUBPEL(mi_row * MI_SIZE);
  xd->mb_to_bottom_edge = GET_MV_SUBPEL((mi_rows - bh - mi_row) * MI_SIZE);
  xd->mb_to_left_edge = -GET_MV_SUBPEL((mi_col * MI_SIZE));
  xd->mb_to_right_edge = GET_MV_SUBPEL((mi_cols - bw - mi_col) * MI_SIZE);
 
  xd->mi_row = mi_row;
  xd->mi_col = mi_col;
 
  // Are edges available for intra prediction?
  xd->up_available = (mi_row > tile->mi_row_start);
 
  const int ss_x = xd->plane[1].subsampling_x;
  const int ss_y = xd->plane[1].subsampling_y;
 
  xd->left_available = (mi_col > tile->mi_col_start);
  xd->chroma_up_available = xd->up_available;
  xd->chroma_left_available = xd->left_available;
  if (ss_x && bw < mi_size_wide[BLOCK_8X8])
    xd->chroma_left_available = (mi_col - 1) > tile->mi_col_start;
  if (ss_y && bh < mi_size_high[BLOCK_8X8])
    xd->chroma_up_available = (mi_row - 1) > tile->mi_row_start;
  if (xd->up_available) {
    xd->above_mbmi = xd->mi[-xd->mi_stride];
  } else {
    xd->above_mbmi = NULL;
  }
 
  if (xd->left_available) {
    xd->left_mbmi = xd->mi[-1];
  } else {
    xd->left_mbmi = NULL;
  }
 
  const int chroma_ref = ((mi_row & 0x01) || !(bh & 0x01) || !ss_y) &&
                         ((mi_col & 0x01) || !(bw & 0x01) || !ss_x);
  xd->is_chroma_ref = chroma_ref;
  if (chroma_ref) {
    // To help calculate the "above" and "left" chroma blocks, note that the
    // current block may cover multiple luma blocks (eg, if partitioned into
    // 4x4 luma blocks).
    // First, find the top-left-most luma block covered by this chroma block
    MB_MODE_INFO **base_mi =
        &xd->mi[-(mi_row & ss_y) * xd->mi_stride - (mi_col & ss_x)];
 
    // Then, we consider the luma region covered by the left or above 4x4 chroma
    // prediction. We want to point to the chroma reference block in that
    // region, which is the bottom-right-most mi unit.
    // This leads to the following offsets:
    MB_MODE_INFO *chroma_above_mi =
        xd->chroma_up_available ? base_mi[-xd->mi_stride + ss_x] : NULL;
    xd->chroma_above_mbmi = chroma_above_mi;
 
    MB_MODE_INFO *chroma_left_mi =
        xd->chroma_left_available ? base_mi[ss_y * xd->mi_stride - 1] : NULL;
    xd->chroma_left_mbmi = chroma_left_mi;
  }
 
  xd->height = bh;
  xd->width = bw;
 
  xd->is_last_vertical_rect = 0;
  if (xd->width < xd->height) {
    if (!((mi_col + xd->width) & (xd->height - 1))) {
      xd->is_last_vertical_rect = 1;
    }
  }
 
  xd->is_first_horizontal_rect = 0;
  if (xd->width > xd->height)
    if (!(mi_row & (xd->width - 1))) xd->is_first_horizontal_rect = 1;
}
 
static INLINE aom_cdf_prob *get_y_mode_cdf(FRAME_CONTEXT *tile_ctx,
                                           const MB_MODE_INFO *above_mi,
                                           const MB_MODE_INFO *left_mi) {
  const PREDICTION_MODE above = av1_above_block_mode(above_mi);
  const PREDICTION_MODE left = av1_left_block_mode(left_mi);
  const int above_ctx = intra_mode_context[above];
  const int left_ctx = intra_mode_context[left];
  return tile_ctx->kf_y_cdf[above_ctx][left_ctx];
}
 
static INLINE void update_partition_context(MACROBLOCKD *xd, int mi_row,
                                            int mi_col, BLOCK_SIZE subsize,
                                            BLOCK_SIZE bsize) {
  PARTITION_CONTEXT *const above_ctx = xd->above_partition_context + mi_col;
  PARTITION_CONTEXT *const left_ctx =
      xd->left_partition_context + (mi_row & MAX_MIB_MASK);
 
  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
  memset(above_ctx, partition_context_lookup[subsize].above, bw);
  memset(left_ctx, partition_context_lookup[subsize].left, bh);
}
 
static INLINE int is_chroma_reference(int mi_row, int mi_col, BLOCK_SIZE bsize,
                                      int subsampling_x, int subsampling_y) {
  assert(bsize < BLOCK_SIZES_ALL);
  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
  int ref_pos = ((mi_row & 0x01) || !(bh & 0x01) || !subsampling_y) &&
                ((mi_col & 0x01) || !(bw & 0x01) || !subsampling_x);
  return ref_pos;
}
 
static INLINE aom_cdf_prob cdf_element_prob(const aom_cdf_prob *cdf,
                                            size_t element) {
  assert(cdf != NULL);
  return (element > 0 ? cdf[element - 1] : CDF_PROB_TOP) - cdf[element];
}
 
static INLINE void partition_gather_horz_alike(aom_cdf_prob *out,
                                               const aom_cdf_prob *const in,
                                               BLOCK_SIZE bsize) {
  (void)bsize;
  out[0] = CDF_PROB_TOP;
  out[0] -= cdf_element_prob(in, PARTITION_HORZ);
  out[0] -= cdf_element_prob(in, PARTITION_SPLIT);
  out[0] -= cdf_element_prob(in, PARTITION_HORZ_A);
  out[0] -= cdf_element_prob(in, PARTITION_HORZ_B);
  out[0] -= cdf_element_prob(in, PARTITION_VERT_A);
  if (bsize != BLOCK_128X128) out[0] -= cdf_element_prob(in, PARTITION_HORZ_4);
  out[0] = AOM_ICDF(out[0]);
  out[1] = AOM_ICDF(CDF_PROB_TOP);
}
 
static INLINE void partition_gather_vert_alike(aom_cdf_prob *out,
                                               const aom_cdf_prob *const in,
                                               BLOCK_SIZE bsize) {
  (void)bsize;
  out[0] = CDF_PROB_TOP;
  out[0] -= cdf_element_prob(in, PARTITION_VERT);
  out[0] -= cdf_element_prob(in, PARTITION_SPLIT);
  out[0] -= cdf_element_prob(in, PARTITION_HORZ_A);
  out[0] -= cdf_element_prob(in, PARTITION_VERT_A);
  out[0] -= cdf_element_prob(in, PARTITION_VERT_B);
  if (bsize != BLOCK_128X128) out[0] -= cdf_element_prob(in, PARTITION_VERT_4);
  out[0] = AOM_ICDF(out[0]);
  out[1] = AOM_ICDF(CDF_PROB_TOP);
}
 
static INLINE void update_ext_partition_context(MACROBLOCKD *xd, int mi_row,
                                                int mi_col, BLOCK_SIZE subsize,
                                                BLOCK_SIZE bsize,
                                                PARTITION_TYPE partition) {
  if (bsize >= BLOCK_8X8) {
    const int hbs = mi_size_wide[bsize] / 2;
    BLOCK_SIZE bsize2 = get_partition_subsize(bsize, PARTITION_SPLIT);
    switch (partition) {
      case PARTITION_SPLIT:
        if (bsize != BLOCK_8X8) break;
        AOM_FALLTHROUGH_INTENDED;
      case PARTITION_NONE:
      case PARTITION_HORZ:
      case PARTITION_VERT:
      case PARTITION_HORZ_4:
      case PARTITION_VERT_4:
        update_partition_context(xd, mi_row, mi_col, subsize, bsize);
        break;
      case PARTITION_HORZ_A:
        update_partition_context(xd, mi_row, mi_col, bsize2, subsize);
        update_partition_context(xd, mi_row + hbs, mi_col, subsize, subsize);
        break;
      case PARTITION_HORZ_B:
        update_partition_context(xd, mi_row, mi_col, subsize, subsize);
        update_partition_context(xd, mi_row + hbs, mi_col, bsize2, subsize);
        break;
      case PARTITION_VERT_A:
        update_partition_context(xd, mi_row, mi_col, bsize2, subsize);
        update_partition_context(xd, mi_row, mi_col + hbs, subsize, subsize);
        break;
      case PARTITION_VERT_B:
        update_partition_context(xd, mi_row, mi_col, subsize, subsize);
        update_partition_context(xd, mi_row, mi_col + hbs, bsize2, subsize);
        break;
      default: assert(0 && "Invalid partition type");
    }
  }
}
 
static INLINE int partition_plane_context(const MACROBLOCKD *xd, int mi_row,
                                          int mi_col, BLOCK_SIZE bsize) {
  const PARTITION_CONTEXT *above_ctx = xd->above_partition_context + mi_col;
  const PARTITION_CONTEXT *left_ctx =
      xd->left_partition_context + (mi_row & MAX_MIB_MASK);
  // Minimum partition point is 8x8. Offset the bsl accordingly.
  const int bsl = mi_size_wide_log2[bsize] - mi_size_wide_log2[BLOCK_8X8];
  int above = (*above_ctx >> bsl) & 1, left = (*left_ctx >> bsl) & 1;
 
  assert(mi_size_wide_log2[bsize] == mi_size_high_log2[bsize]);
  assert(bsl >= 0);
 
  return (left * 2 + above) + bsl * PARTITION_PLOFFSET;
}
 
// Return the number of elements in the partition CDF when
// partitioning the (square) block with luma block size of bsize.
static INLINE int partition_cdf_length(BLOCK_SIZE bsize) {
  if (bsize <= BLOCK_8X8)
    return PARTITION_TYPES;
  else if (bsize == BLOCK_128X128)
    return EXT_PARTITION_TYPES - 2;
  else
    return EXT_PARTITION_TYPES;
}
 
static INLINE int max_block_wide(const MACROBLOCKD *xd, BLOCK_SIZE bsize,
                                 int plane) {
  assert(bsize < BLOCK_SIZES_ALL);
  int max_blocks_wide = block_size_wide[bsize];
 
  if (xd->mb_to_right_edge < 0) {
    const struct macroblockd_plane *const pd = &xd->plane[plane];
    max_blocks_wide += xd->mb_to_right_edge >> (3 + pd->subsampling_x);
  }
 
  // Scale the width in the transform block unit.
  return max_blocks_wide >> MI_SIZE_LOG2;
}
 
static INLINE int max_block_high(const MACROBLOCKD *xd, BLOCK_SIZE bsize,
                                 int plane) {
  int max_blocks_high = block_size_high[bsize];
 
  if (xd->mb_to_bottom_edge < 0) {
    const struct macroblockd_plane *const pd = &xd->plane[plane];
    max_blocks_high += xd->mb_to_bottom_edge >> (3 + pd->subsampling_y);
  }
 
  // Scale the height in the transform block unit.
  return max_blocks_high >> MI_SIZE_LOG2;
}
 
static INLINE void av1_zero_above_context(AV1_COMMON *const cm,
                                          const MACROBLOCKD *xd,
                                          int mi_col_start, int mi_col_end,
                                          const int tile_row) {
  const SequenceHeader *const seq_params = &cm->seq_params;
  const int num_planes = av1_num_planes(cm);
  const int width = mi_col_end - mi_col_start;
  const int aligned_width =
      ALIGN_POWER_OF_TWO(width, seq_params->mib_size_log2);
  const int offset_y = mi_col_start;
  const int width_y = aligned_width;
  const int offset_uv = offset_y >> seq_params->subsampling_x;
  const int width_uv = width_y >> seq_params->subsampling_x;
  CommonContexts *const above_contexts = &cm->above_contexts;
 
  av1_zero_array(above_contexts->entropy[0][tile_row] + offset_y, width_y);
  if (num_planes > 1) {
    if (above_contexts->entropy[1][tile_row] &&
        above_contexts->entropy[2][tile_row]) {
      av1_zero_array(above_contexts->entropy[1][tile_row] + offset_uv,
                     width_uv);
      av1_zero_array(above_contexts->entropy[2][tile_row] + offset_uv,
                     width_uv);
    } else {
      aom_internal_error(xd->error_info, AOM_CODEC_CORRUPT_FRAME,
                         "Invalid value of planes");
    }
  }
 
  av1_zero_array(above_contexts->partition[tile_row] + mi_col_start,
                 aligned_width);
 
  memset(above_contexts->txfm[tile_row] + mi_col_start,
         tx_size_wide[TX_SIZES_LARGEST], aligned_width * sizeof(TXFM_CONTEXT));
}
 
static INLINE void av1_zero_left_context(MACROBLOCKD *const xd) {
  av1_zero(xd->left_entropy_context);
  av1_zero(xd->left_partition_context);
 
  memset(xd->left_txfm_context_buffer, tx_size_high[TX_SIZES_LARGEST],
         sizeof(xd->left_txfm_context_buffer));
}
 
// Disable array-bounds checks as the TX_SIZE enum contains values larger than
// TX_SIZES_ALL (TX_INVALID) which make extending the array as a workaround
// infeasible. The assert is enough for static analysis and this or other tools
// asan, valgrind would catch oob access at runtime.
#if defined(__GNUC__) && __GNUC__ >= 4
#pragma GCC diagnostic ignored "-Warray-bounds"
#endif
 
#if defined(__GNUC__) && __GNUC__ >= 4
#pragma GCC diagnostic warning "-Warray-bounds"
#endif
 
static INLINE void set_txfm_ctx(TXFM_CONTEXT *txfm_ctx, uint8_t txs, int len) {
  int i;
  for (i = 0; i < len; ++i) txfm_ctx[i] = txs;
}
 
static INLINE void set_txfm_ctxs(TX_SIZE tx_size, int n4_w, int n4_h, int skip,
                                 const MACROBLOCKD *xd) {
  uint8_t bw = tx_size_wide[tx_size];
  uint8_t bh = tx_size_high[tx_size];
 
  if (skip) {
    bw = n4_w * MI_SIZE;
    bh = n4_h * MI_SIZE;
  }
 
  set_txfm_ctx(xd->above_txfm_context, bw, n4_w);
  set_txfm_ctx(xd->left_txfm_context, bh, n4_h);
}
 
static INLINE int get_mi_grid_idx(const CommonModeInfoParams *const mi_params,
                                  int mi_row, int mi_col) {
  return mi_row * mi_params->mi_stride + mi_col;
}
 
static INLINE int get_alloc_mi_idx(const CommonModeInfoParams *const mi_params,
                                   int mi_row, int mi_col) {
  const int mi_alloc_size_1d = mi_size_wide[mi_params->mi_alloc_bsize];
  const int mi_alloc_row = mi_row / mi_alloc_size_1d;
  const int mi_alloc_col = mi_col / mi_alloc_size_1d;
 
  return mi_alloc_row * mi_params->mi_alloc_stride + mi_alloc_col;
}
 
// For this partition block, set pointers in mi_params->mi_grid_base and xd->mi.
static INLINE void set_mi_offsets(const CommonModeInfoParams *const mi_params,
                                  MACROBLOCKD *const xd, int mi_row,
                                  int mi_col) {
  // 'mi_grid_base' should point to appropriate memory in 'mi'.
  const int mi_grid_idx = get_mi_grid_idx(mi_params, mi_row, mi_col);
  const int mi_alloc_idx = get_alloc_mi_idx(mi_params, mi_row, mi_col);
  mi_params->mi_grid_base[mi_grid_idx] = &mi_params->mi_alloc[mi_alloc_idx];
  // 'xd->mi' should point to an offset in 'mi_grid_base';
  xd->mi = mi_params->mi_grid_base + mi_grid_idx;
  // 'xd->tx_type_map' should point to an offset in 'mi_params->tx_type_map'.
  xd->tx_type_map = mi_params->tx_type_map + mi_grid_idx;
  xd->tx_type_map_stride = mi_params->mi_stride;
}
 
static INLINE void txfm_partition_update(TXFM_CONTEXT *above_ctx,
                                         TXFM_CONTEXT *left_ctx,
                                         TX_SIZE tx_size, TX_SIZE txb_size) {
  BLOCK_SIZE bsize = txsize_to_bsize[txb_size];
  int bh = mi_size_high[bsize];
  int bw = mi_size_wide[bsize];
  uint8_t txw = tx_size_wide[tx_size];
  uint8_t txh = tx_size_high[tx_size];
  int i;
  for (i = 0; i < bh; ++i) left_ctx[i] = txh;
  for (i = 0; i < bw; ++i) above_ctx[i] = txw;
}
 
static INLINE TX_SIZE get_sqr_tx_size(int tx_dim) {
  switch (tx_dim) {
    case 128:
    case 64: return TX_64X64; break;
    case 32: return TX_32X32; break;
    case 16: return TX_16X16; break;
    case 8: return TX_8X8; break;
    default: return TX_4X4;
  }
}
 
static INLINE TX_SIZE get_tx_size(int width, int height) {
  if (width == height) {
    return get_sqr_tx_size(width);
  }
  if (width < height) {
    if (width + width == height) {
      switch (width) {
        case 4: return TX_4X8; break;
        case 8: return TX_8X16; break;
        case 16: return TX_16X32; break;
        case 32: return TX_32X64; break;
      }
    } else {
      switch (width) {
        case 4: return TX_4X16; break;
        case 8: return TX_8X32; break;
        case 16: return TX_16X64; break;
      }
    }
  } else {
    if (height + height == width) {
      switch (height) {
        case 4: return TX_8X4; break;
        case 8: return TX_16X8; break;
        case 16: return TX_32X16; break;
        case 32: return TX_64X32; break;
      }
    } else {
      switch (height) {
        case 4: return TX_16X4; break;
        case 8: return TX_32X8; break;
        case 16: return TX_64X16; break;
      }
    }
  }
  assert(0);
  return TX_4X4;
}
 
static INLINE int txfm_partition_context(const TXFM_CONTEXT *const above_ctx,
                                         const TXFM_CONTEXT *const left_ctx,
                                         BLOCK_SIZE bsize, TX_SIZE tx_size) {
  const uint8_t txw = tx_size_wide[tx_size];
  const uint8_t txh = tx_size_high[tx_size];
  const int above = *above_ctx < txw;
  const int left = *left_ctx < txh;
  int category = TXFM_PARTITION_CONTEXTS;
 
  // dummy return, not used by others.
  if (tx_size <= TX_4X4) return 0;
 
  TX_SIZE max_tx_size =
      get_sqr_tx_size(AOMMAX(block_size_wide[bsize], block_size_high[bsize]));
 
  if (max_tx_size >= TX_8X8) {
    category =
        (txsize_sqr_up_map[tx_size] != max_tx_size && max_tx_size > TX_8X8) +
        (TX_SIZES - 1 - max_tx_size) * 2;
  }
  assert(category != TXFM_PARTITION_CONTEXTS);
  return category * 3 + above + left;
}
 
// Compute the next partition in the direction of the sb_type stored in the mi
// array, starting with bsize.
static INLINE PARTITION_TYPE get_partition(const AV1_COMMON *const cm,
                                           int mi_row, int mi_col,
                                           BLOCK_SIZE bsize) {
  const CommonModeInfoParams *const mi_params = &cm->mi_params;
  if (mi_row >= mi_params->mi_rows || mi_col >= mi_params->mi_cols)
    return PARTITION_INVALID;
 
  const int offset = mi_row * mi_params->mi_stride + mi_col;
  MB_MODE_INFO **mi = mi_params->mi_grid_base + offset;
  const BLOCK_SIZE subsize = mi[0]->bsize;
 
  assert(bsize < BLOCK_SIZES_ALL);
 
  if (subsize == bsize) return PARTITION_NONE;
 
  const int bhigh = mi_size_high[bsize];
  const int bwide = mi_size_wide[bsize];
  const int sshigh = mi_size_high[subsize];
  const int sswide = mi_size_wide[subsize];
 
  if (bsize > BLOCK_8X8 && mi_row + bwide / 2 < mi_params->mi_rows &&
      mi_col + bhigh / 2 < mi_params->mi_cols) {
    // In this case, the block might be using an extended partition
    // type.
    const MB_MODE_INFO *const mbmi_right = mi[bwide / 2];
    const MB_MODE_INFO *const mbmi_below = mi[bhigh / 2 * mi_params->mi_stride];
 
    if (sswide == bwide) {
      // Smaller height but same width. Is PARTITION_HORZ_4, PARTITION_HORZ or
      // PARTITION_HORZ_B. To distinguish the latter two, check if the lower
      // half was split.
      if (sshigh * 4 == bhigh) return PARTITION_HORZ_4;
      assert(sshigh * 2 == bhigh);
 
      if (mbmi_below->bsize == subsize)
        return PARTITION_HORZ;
      else
        return PARTITION_HORZ_B;
    } else if (sshigh == bhigh) {
      // Smaller width but same height. Is PARTITION_VERT_4, PARTITION_VERT or
      // PARTITION_VERT_B. To distinguish the latter two, check if the right
      // half was split.
      if (sswide * 4 == bwide) return PARTITION_VERT_4;
      assert(sswide * 2 == bhigh);
 
      if (mbmi_right->bsize == subsize)
        return PARTITION_VERT;
      else
        return PARTITION_VERT_B;
    } else {
      // Smaller width and smaller height. Might be PARTITION_SPLIT or could be
      // PARTITION_HORZ_A or PARTITION_VERT_A. If subsize isn't halved in both
      // dimensions, we immediately know this is a split (which will recurse to
      // get to subsize). Otherwise look down and to the right. With
      // PARTITION_VERT_A, the right block will have height bhigh; with
      // PARTITION_HORZ_A, the lower block with have width bwide. Otherwise
      // it's PARTITION_SPLIT.
      if (sswide * 2 != bwide || sshigh * 2 != bhigh) return PARTITION_SPLIT;
 
      if (mi_size_wide[mbmi_below->bsize] == bwide) return PARTITION_HORZ_A;
      if (mi_size_high[mbmi_right->bsize] == bhigh) return PARTITION_VERT_A;
 
      return PARTITION_SPLIT;
    }
  }
  const int vert_split = sswide < bwide;
  const int horz_split = sshigh < bhigh;
  const int split_idx = (vert_split << 1) | horz_split;
  assert(split_idx != 0);
 
  static const PARTITION_TYPE base_partitions[4] = {
    PARTITION_INVALID, PARTITION_HORZ, PARTITION_VERT, PARTITION_SPLIT
  };
 
  return base_partitions[split_idx];
}
 
static INLINE void set_sb_size(SequenceHeader *const seq_params,
                               BLOCK_SIZE sb_size) {
  seq_params->sb_size = sb_size;
  seq_params->mib_size = mi_size_wide[seq_params->sb_size];
  seq_params->mib_size_log2 = mi_size_wide_log2[seq_params->sb_size];
}
 
// Returns true if the frame is fully lossless at the coded resolution.
// Note: If super-resolution is used, such a frame will still NOT be lossless at
// the upscaled resolution.
static INLINE int is_coded_lossless(const AV1_COMMON *cm,
                                    const MACROBLOCKD *xd) {
  int coded_lossless = 1;
  if (cm->seg.enabled) {
    for (int i = 0; i < MAX_SEGMENTS; ++i) {
      if (!xd->lossless[i]) {
        coded_lossless = 0;
        break;
      }
    }
  } else {
    coded_lossless = xd->lossless[0];
  }
  return coded_lossless;
}
 
static INLINE int is_valid_seq_level_idx(AV1_LEVEL seq_level_idx) {
  return seq_level_idx == SEQ_LEVEL_MAX ||
         (seq_level_idx < SEQ_LEVELS &&
          // The following levels are currently undefined.
          seq_level_idx != SEQ_LEVEL_2_2 && seq_level_idx != SEQ_LEVEL_2_3 &&
          seq_level_idx != SEQ_LEVEL_3_2 && seq_level_idx != SEQ_LEVEL_3_3 &&
          seq_level_idx != SEQ_LEVEL_4_2 && seq_level_idx != SEQ_LEVEL_4_3 &&
          seq_level_idx != SEQ_LEVEL_7_0 && seq_level_idx != SEQ_LEVEL_7_1 &&
          seq_level_idx != SEQ_LEVEL_7_2 && seq_level_idx != SEQ_LEVEL_7_3);
}

 
#ifdef __cplusplus
}  // extern "C"
#endif
 
#endif  // AOM_AV1_COMMON_AV1_COMMON_INT_H_