vp9/encoder/vp9_speed_features.h

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef VP9_ENCODER_VP9_SPEED_FEATURES_H_
#define VP9_ENCODER_VP9_SPEED_FEATURES_H_

#include "vp9/common/vp9_enums.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
  DIAMOND = 0,
  NSTEP = 1,
  HEX = 2,
  BIGDIA = 3,
  SQUARE = 4,
  FAST_HEX = 5,
  FAST_DIAMOND = 6
} SEARCH_METHODS;

typedef enum {
  // No recode.
  DISALLOW_RECODE = 0,
  // Allow recode for KF and exceeding maximum frame bandwidth.
  ALLOW_RECODE_KFMAXBW = 1,
  // Allow recode only for KF/ARF/GF frames.
  ALLOW_RECODE_KFARFGF = 2,
  // Allow recode for all frames based on bitrate constraints.
  ALLOW_RECODE = 3,
} RECODE_LOOP_TYPE;

typedef enum {
  SUBPEL_TREE = 0,
  // Other methods to come
} SUBPEL_SEARCH_METHODS;

typedef enum {
  LAST_FRAME_PARTITION_OFF = 0,
  LAST_FRAME_PARTITION_LOW_MOTION = 1,
  LAST_FRAME_PARTITION_ALL = 2
} LAST_FRAME_PARTITION_METHOD;

typedef enum {
  USE_FULL_RD = 0,
  USE_LARGESTINTRA,
  USE_LARGESTINTRA_MODELINTER,
  USE_LARGESTALL
} TX_SIZE_SEARCH_METHOD;

typedef enum {
  NOT_IN_USE = 0,
  RELAXED_NEIGHBORING_MIN_MAX = 1,
  STRICT_NEIGHBORING_MIN_MAX = 2
} AUTO_MIN_MAX_MODE;

typedef enum {
  // Try the full image with different values.
  LPF_PICK_FROM_FULL_IMAGE,
  // Try a small portion of the image with different values.
  LPF_PICK_FROM_SUBIMAGE,
  // Estimate the level based on quantizer and frame type
  LPF_PICK_FROM_Q,
} LPF_PICK_METHOD;

typedef enum {
  // Terminate search early based on distortion so far compared to
  // qp step, distortion in the neighborhood of the frame, etc.
  FLAG_EARLY_TERMINATE = 1 << 0,

  // Skips comp inter modes if the best so far is an intra mode.
  FLAG_SKIP_COMP_BESTINTRA = 1 << 1,

  // Skips comp inter modes if the best single intermode so far does
  // not have the same reference as one of the two references being
  // tested.
  FLAG_SKIP_COMP_REFMISMATCH = 1 << 2,

  // Skips oblique intra modes if the best so far is an inter mode.
  FLAG_SKIP_INTRA_BESTINTER = 1 << 3,

  // Skips oblique intra modes  at angles 27, 63, 117, 153 if the best
  // intra so far is not one of the neighboring directions.
  FLAG_SKIP_INTRA_DIRMISMATCH = 1 << 4,

  // Skips intra modes other than DC_PRED if the source variance is small
  FLAG_SKIP_INTRA_LOWVAR = 1 << 5,
} MODE_SEARCH_SKIP_LOGIC;

typedef enum {
  // Search partitions using RD/NONRD criterion
  SEARCH_PARTITION = 0,

  // Always use a fixed size partition
  FIXED_PARTITION = 1,

  // Use a fixed size partition in every 64X64 SB, where the size is
  // determined based on source variance
  VAR_BASED_FIXED_PARTITION = 2,

  REFERENCE_PARTITION = 3,

  // Use an arbitrary partitioning scheme based on source variance within
  // a 64X64 SB
  VAR_BASED_PARTITION,

  // Use non-fixed partitions based on source variance
  SOURCE_VAR_BASED_PARTITION
} PARTITION_SEARCH_TYPE;

typedef enum {
  // Does a dry run to see if any of the contexts need to be updated or not,
  // before the final run.
  TWO_LOOP = 0,

  // No dry run conducted.
  ONE_LOOP = 1,

  // No dry run, also only half the coef contexts and bands are updated.
  // The rest are not updated at all.
  ONE_LOOP_REDUCED = 2
} FAST_COEFF_UPDATE;

typedef struct {
  // Frame level coding parameter update
  int frame_parameter_update;

  // Motion search method (Diamond, NSTEP, Hex, Big Diamond, Square, etc).
  SEARCH_METHODS search_method;

  RECODE_LOOP_TYPE recode_loop;

  // Subpel_search_method can only be subpel_tree which does a subpixel
  // logarithmic search that keeps stepping at 1/2 pixel units until
  // you stop getting a gain, and then goes on to 1/4 and repeats
  // the same process. Along the way it skips many diagonals.
  SUBPEL_SEARCH_METHODS subpel_search_method;

  // Maximum number of steps in logarithmic subpel search before giving up.
  int subpel_iters_per_step;

  // Control when to stop subpel search
  int subpel_force_stop;

  // This parameter controls the number of steps we'll do in a diamond
  // search.
  int max_step_search_steps;

  // This parameter controls which step in the n-step process we start at.
  // It's changed adaptively based on circumstances.
  int reduce_first_step_size;

  // If this is set to 1, we limit the motion search range to 2 times the
  // largest motion vector found in the last frame.
  int auto_mv_step_size;

  // Trellis (dynamic programming) optimization of quantized values (+1, 0).
  int optimize_coefficients;

  // Always set to 0. If on it enables 0 cost background transmission
  // (except for the initial transmission of the segmentation). The feature is
  // disabled because the addition of very large block sizes make the
  // backgrounds very to cheap to encode, and the segmentation we have
  // adds overhead.
  int static_segmentation;

  // If 1 we iterate finding a best reference for 2 ref frames together - via
  // a log search that iterates 4 times (check around mv for last for best
  // error of combined predictor then check around mv for alt). If 0 we
  // we just use the best motion vector found for each frame by itself.
  int comp_inter_joint_search_thresh;

  // This variable is used to cap the maximum number of times we skip testing a
  // mode to be evaluated. A high value means we will be faster.
  int adaptive_rd_thresh;

  // Enables skipping the reconstruction step (idct, recon) in the
  // intermediate steps assuming the last frame didn't have too many intra
  // blocks and the q is less than a threshold.
  int skip_encode_sb;
  int skip_encode_frame;
  // Speed feature to allow or disallow skipping of recode at block
  // level within a frame.
  int allow_skip_recode;

  // This variable allows us to reuse the last frames partition choices
  // (64x64 v 32x32 etc) for this frame. It can be set to only use the last
  // frame as a starting point in low motion scenes or always use it. If set
  // we use last partitioning_redo frequency to determine how often to redo
  // the partitioning from scratch. Adjust_partitioning_from_last_frame
  // enables us to adjust up or down one partitioning from the last frames
  // partitioning.
  LAST_FRAME_PARTITION_METHOD use_lastframe_partitioning;

  // Determine which method we use to determine transform size. We can choose
  // between options like full rd, largest for prediction size, largest
  // for intra and model coefs for the rest.
  TX_SIZE_SEARCH_METHOD tx_size_search_method;

  // Low precision 32x32 fdct keeps everything in 16 bits and thus is less
  // precise but significantly faster than the non lp version.
  int use_lp32x32fdct;

  // TODO(JBB): remove this as its no longer used.

  // After looking at the first set of modes (set by index here), skip
  // checking modes for reference frames that don't match the reference frame
  // of the best so far.
  int mode_skip_start;

  // TODO(JBB): Remove this.
  int reference_masking;

  PARTITION_SEARCH_TYPE partition_search_type;

  // Used if partition_search_type = FIXED_SIZE_PARTITION
  BLOCK_SIZE always_this_block_size;

  // Skip rectangular partition test when partition type none gives better
  // rd than partition type split.
  int less_rectangular_check;

  // Disable testing non square partitions. (eg 16x32)
  int use_square_partition_only;

  // Sets min and max partition sizes for this 64x64 region based on the
  // same 64x64 in last encoded frame, and the left and above neighbor.
  AUTO_MIN_MAX_MODE auto_min_max_partition_size;

  // Min and max partition size we enable (block_size) as per auto
  // min max, but also used by adjust partitioning, and pick_partitioning.
  BLOCK_SIZE min_partition_size;
  BLOCK_SIZE max_partition_size;

  // Whether or not we allow partitions one smaller or one greater than the last
  // frame's partitioning. Only used if use_lastframe_partitioning is set.
  int adjust_partitioning_from_last_frame;

  // How frequently we re do the partitioning from scratch. Only used if
  // use_lastframe_partitioning is set.
  int last_partitioning_redo_frequency;

  // This enables constrained copy partitioning, which, given an input block
  // size bsize, will copy previous partition for partitions less than bsize,
  // otherwise bsize partition is used. bsize is currently set to 16x16.
  // Used for the case where motion is detected in superblock.
  int constrain_copy_partition;

  // Disables sub 8x8 blocksizes in different scenarios: Choices are to disable
  // it always, to allow it for only Last frame and Intra, disable it for all
  // inter modes or to enable it always.
  int disable_split_mask;

  // TODO(jingning): combine the related motion search speed features
  // This allows us to use motion search at other sizes as a starting
  // point for this motion search and limits the search range around it.
  int adaptive_motion_search;

  // Allows sub 8x8 modes to use the prediction filter that was determined
  // best for 8x8 mode. If set to 0 we always re check all the filters for
  // sizes less than 8x8, 1 means we check all filter modes if no 8x8 filter
  // was selected, and 2 means we use 8 tap if no 8x8 filter mode was selected.
  int adaptive_pred_interp_filter;

  // Search through variable block partition types in non-RD mode decision
  // encoding process for RTC.
  int partition_check;

  // Use finer quantizer in every other few frames that run variable block
  // partition type search.
  int force_frame_boost;

  // Maximally allowed base quantization index fluctuation.
  int max_delta_qindex;

  // Implements various heuristics to skip searching modes
  // The heuristics selected are based on  flags
  // defined in the MODE_SEARCH_SKIP_HEURISTICS enum
  unsigned int mode_search_skip_flags;

  // A source variance threshold below which the split mode is disabled
  unsigned int disable_split_var_thresh;

  // A source variance threshold below which filter search is disabled
  // Choose a very large value (UINT_MAX) to use 8-tap always
  unsigned int disable_filter_search_var_thresh;

  // These bit masks allow you to enable or disable intra modes for each
  // transform size separately.
  int intra_y_mode_mask[TX_SIZES];
  int intra_uv_mode_mask[TX_SIZES];

  // This variable enables an early break out of mode testing if the model for
  // rd built from the prediction signal indicates a value that's much
  // higher than the best rd we've seen so far.
  int use_rd_breakout;

  // This enables us to use an estimate for intra rd based on dc mode rather
  // than choosing an actual uv mode in the stage of encoding before the actual
  // final encode.
  int use_uv_intra_rd_estimate;

  // This feature controls how the loop filter level is determined.
  LPF_PICK_METHOD lpf_pick;

  // This feature limits the number of coefficients updates we actually do
  // by only looking at counts from 1/2 the bands.
  FAST_COEFF_UPDATE use_fast_coef_updates;

  // This flag controls the use of non-RD mode decision.
  int use_nonrd_pick_mode;

  // This variable sets the encode_breakout threshold. Currently, it is only
  // enabled in real time mode.
  int encode_breakout_thresh;

  // A binary mask indicating if NEARESTMV, NEARMV, ZEROMV, NEWMV
  // modes are disabled in order from LSB to MSB for each BLOCK_SIZE.
  int disable_inter_mode_mask[BLOCK_SIZES];

  // This feature controls whether we do the expensive context update and
  // calculation in the rd coefficient costing loop.
  int use_fast_coef_costing;

  // This feature controls the tolerence vs target used in deciding whether to
  // recode a frame. It has no meaning if recode is disabled.
  int recode_tolerance;

  // This variable controls the maximum block size where intra blocks can be
  // used in inter frames.
  // TODO(aconverse): Fold this into one of the other many mode skips
  BLOCK_SIZE max_intra_bsize;

  // The frequency that we check if SOURCE_VAR_BASED_PARTITION or
  // FIXED_PARTITION search type should be used.
  int search_type_check_frequency;

  // The threshold used in SOURCE_VAR_BASED_PARTITION search type.
  int source_var_thresh;
} SPEED_FEATURES;

struct VP9_COMP;

void vp9_set_speed_features(struct VP9_COMP *cpi);

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

#endif  // VP9_ENCODER_VP9_SPEED_FEATURES_H_