/* * 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.
*/
typedefenum { // 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 ARF/GF/KF and first normal frame in each group.
ALLOW_RECODE_FIRST = 3, // Allow recode for all frames based on bitrate constraints.
ALLOW_RECODE = 4,
} RECODE_LOOP_TYPE;
typedefenum {
SUBPEL_TREE = 0,
SUBPEL_TREE_PRUNED = 1, // Prunes 1/2-pel searches
SUBPEL_TREE_PRUNED_MORE = 2, // Prunes 1/2-pel searches more aggressively
SUBPEL_TREE_PRUNED_EVENMORE = 3, // Prunes 1/2- and 1/4-pel searches // Other methods to come
} SUBPEL_SEARCH_METHODS;
typedefenum { // 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, // Pick 0 to disable LPF if LPF was enabled last frame
LPF_PICK_MINIMAL_LPF
} LPF_PICK_METHOD;
typedefenum { // 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 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;
// 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;
// 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;
// Subpel MV search level. Can take values 0 - 2. Higher values mean more // extensive subpel search. int subpel_search_level;
// When to stop subpel motion search.
SUBPEL_FORCE_STOP subpel_force_stop;
// If it's enabled, different subpel_force_stop will be used for different MV. int enable_adaptive_subpel_force_stop;
ADAPT_SUBPEL_FORCE_STOP adapt_subpel_force_stop;
// This variable sets the step_param used in full pel motion search. int fullpel_search_step_param;
// Whether to downsample the rows in sad calculation during motion search. // This is only active when there are at least 8 rows. int use_downsampled_sad;
} MV_SPEED_FEATURES;
typedefstruct PARTITION_SEARCH_BREAKOUT_THR {
int64_t dist; int rate;
} PARTITION_SEARCH_BREAKOUT_THR;
#define MAX_MESH_STEP 4
typedefstruct MESH_PATTERN { int range; int interval;
} MESH_PATTERN;
typedefenum { // No reaction to rate control on a detected slide/scene change.
NO_DETECTION = 0,
// Set to larger Q (max_q set by user) based only on the // detected slide/scene change and current/past Q.
FAST_DETECTION_MAXQ = 1,
// Based on (first pass) encoded frame, if large frame size is detected // then set to higher Q for the second re-encode. This involves 2 pass // encoding on slide change, so slower than 1, but more accurate for // detecting overshoot.
RE_ENCODE_MAXQ = 2
} OVERSHOOT_DETECTION_CBR_RT;
// Frame level coding parameter update int frame_parameter_update;
RECODE_LOOP_TYPE recode_loop;
// 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;
// The best compound predictor is found using an iterative log search process // that searches for best ref0 mv using error of combined predictor and then // searches for best ref1 mv. This sf determines the number of iterations of // this process based on block size. The sf becomes more aggressive from level // 0 to 2. The following table indicates the number of iterations w.r.t bsize: // ----------------------------------------------- // |sf (level)|bsize < 8X8| [8X8, 16X16] | > 16X16 | // | 0 | 4 | 4 | 4 | // | 1 | 0 | 2 | 4 | // | 2 | 0 | 0 | 0 | // ----------------------------------------------- // Here, 0 iterations indicate using the best single motion vector selected // for each ref frame without any iterative refinement. int comp_inter_joint_search_iter_level;
// 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. // Turned off when (row_mt_bit_exact == 1 && adaptive_rd_thresh_row_mt == 0). int adaptive_rd_thresh;
// Flag to use adaptive_rd_thresh when row-mt is enabled, only for non-rd // pickmode. int adaptive_rd_thresh_row_mt;
// 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;
// Coefficient probability model approximation step size int coeff_prob_appx_step;
// Enable uniform quantizer followed by trellis coefficient optimization // during transform RD
TRELLIS_OPT_CONTROL trellis_opt_tx_rd;
// Enable asymptotic closed-loop encoding decision for key frame and // alternate reference frames. int allow_acl;
// Temporal dependency model based encoding mode optimization int enable_tpl_model;
// Use transform domain distortion. Use pixel domain distortion in speed 0 // and certain situations in higher speed to improve the RD model precision. int allow_txfm_domain_distortion; double tx_domain_thresh;
// The threshold is to determine how slow the motino is, it is used when // use_lastframe_partitioning is set to LAST_FRAME_PARTITION_LOW_MOTION
MOTION_THRESHOLD lf_motion_threshold;
// 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;
// How many levels of tx size to search, starting from the largest. int tx_size_search_depth;
// 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;
// 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_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) for block sizes larger than // use_square_only_thresh_high or smaller than use_square_only_thresh_low. int use_square_partition_only;
BLOCK_SIZE use_square_only_thresh_high;
BLOCK_SIZE use_square_only_thresh_low;
// Prune reference frames for rectangular partitions. int prune_ref_frame_for_rect_partitions;
// 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; // Ensures the rd based auto partition search will always // go down at least to the specified level.
BLOCK_SIZE rd_auto_partition_min_limit;
// 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 default_min_partition_size;
BLOCK_SIZE default_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;
// 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;
// Do extra full pixel motion search to obtain better motion vector. int enhanced_full_pixel_motion_search;
// Threshold for allowing exhaistive motion search. int exhaustive_searches_thresh;
// Pattern to be used for any exhaustive mesh searches.
MESH_PATTERN mesh_patterns[MAX_MESH_STEP];
int schedule_mode_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;
// Adaptive prediction mode search int adaptive_mode_search;
// Prune NEAREST and ZEROMV single reference modes based on motion vector // difference and mode rate int prune_single_mode_based_on_mv_diff_mode_rate;
// Chessboard pattern prediction for interp filter. Aggressiveness increases // with levels. // 0: disable // 1: cb pattern in eval when filter is not switchable // 2: cb pattern prediction for filter search int cb_pred_filter_search;
// This variable enables an early termination of interpolation filter eval // based on the current rd cost after processing each plane int early_term_interp_search_plane_rd;
int cb_partition_search;
int motion_field_mode_search;
int alt_ref_search_fp;
// Fast quantization process path int use_quant_fp;
// 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 unsignedint mode_search_skip_flags;
// A source variance threshold below which filter search is disabled // Choose a very large value (UINT_MAX) to use 8-tap always unsignedint 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];
// These bit masks allow you to enable or disable intra modes for each // prediction block size separately. int intra_y_mode_bsize_mask[BLOCK_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;
// A binary mask indicating if NEARESTMV, NEARMV, ZEROMV, NEWMV // modes are used in order from LSB to MSB for each BLOCK_SIZE. int 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_low; int recode_tolerance_high;
// 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;
// When partition is pre-set, the inter prediction result from pick_inter_mode // can be reused in final block encoding process. It is enabled only for real- // time mode speed 6. int reuse_inter_pred_sby;
// This variable sets the encode_breakout threshold. Currently, it is only // enabled in real time mode. int encode_breakout_thresh;
// Early termination in transform size search, which only applies while // tx_size_search_method is USE_FULL_RD. int tx_size_search_breakout;
// adaptive interp_filter search to allow skip of certain filter types. int adaptive_interp_filter_search;
// mask for skip evaluation of certain interp_filter type.
INTERP_FILTER_MASK interp_filter_search_mask;
// Partition search early breakout thresholds.
PARTITION_SEARCH_BREAKOUT_THR partition_search_breakout_thr;
struct { // Use ML-based partition search early breakout. int search_breakout; // Higher values mean more aggressiveness for partition search breakout that // results in better encoding speed but worse compression performance. float search_breakout_thresh[3];
// Machine-learning based partition search early termination int search_early_termination;
// Machine-learning based partition search pruning using prediction residue // variance. int var_pruning;
// Threshold values used for ML based rectangular partition search pruning. // If < 0, the feature is turned off. // Higher values mean more aggressiveness to skip rectangular partition // search that results in better encoding speed but worse coding // performance. int prune_rect_thresh[4];
} rd_ml_partition;
// Fast approximation of vp9_model_rd_from_var_lapndz int simple_model_rd_from_var;
// Skip a number of expensive mode evaluations for blocks with zero source // variance. int short_circuit_flat_blocks;
// Skip a number of expensive mode evaluations for blocks with very low // temporal variance. If the low temporal variance flag is set for a block, // do the following: // 1: Skip all golden modes and ALL INTRA for bsize >= 32x32. // 2: Skip golden non-zeromv and newmv-last for bsize >= 16x16, skip ALL // INTRA for bsize >= 32x32 and vert/horz INTRA for bsize 16x16, 16x32 and // 32x16. // 3: Same as (2), but also skip golden zeromv. int short_circuit_low_temp_var;
// Limits the rd-threshold update for early exit for the newmv-last mode, // for non-rd mode. int limit_newmv_early_exit;
// Adds a bias against golden reference, for non-rd mode. int bias_golden;
// Bias to use base mv and skip 1/4 subpel search when use base mv in // enhancement layer. int base_mv_aggressive;
// Global flag to enable partition copy from the previous frame. int copy_partition_flag;
// Compute the source sad for every superblock of the frame, // prior to encoding the frame, to be used to bypass some encoder decisions. int use_source_sad;
int use_simple_block_yrd;
// If source sad of superblock is high (> adapt_partition_thresh), will switch // from VARIANCE_PARTITION to REFERENCE_PARTITION (which selects partition // based on the nonrd-pickmode). int adapt_partition_source_sad; int adapt_partition_thresh;
// Enable use of alt-refs in 1 pass VBR. int use_altref_onepass;
// Enable use of compound prediction, for nonrd_pickmode with nonzero lag. int use_compound_nonrd_pickmode;
// Always use nonrd_pick_intra for all block sizes on keyframes. int nonrd_keyframe;
// For SVC: enables use of partition from lower spatial resolution. int svc_use_lowres_part;
// Flag to indicate process for handling overshoot on slide/scene change, // for real-time CBR mode.
OVERSHOOT_DETECTION_CBR_RT overshoot_detection_cbr_rt;
// Disable partitioning of 16x16 blocks. int disable_16x16part_nonkey;
// Allow for disabling golden reference. int disable_golden_ref;
// Allow sub-pixel search to use interpolation filters with different taps in // order to achieve accurate motion search result.
SUBPEL_SEARCH_TYPE use_accurate_subpel_search;
// Search method used by temporal filtering in full_pixel_motion_search.
SEARCH_METHODS temporal_filter_search_method;
// Use machine learning based partition search. int nonrd_use_ml_partition;
// Multiplier for base threshold for variance partitioning. int variance_part_thresh_mult;
// Force subpel motion filter to always use SMOOTH_FILTER. int force_smooth_interpol;
// For real-time mode: force DC only under intra search when content // does not have high souce SAD. int rt_intra_dc_only_low_content;
// The encoder has a feature that skips forward transform and quantization // based on a model rd estimation to reduce encoding time. // However, this feature is dangerous since it could lead to bad perceptual // quality. This flag is added to guard the feature. int allow_skip_txfm_ac_dc;
} SPEED_FEATURES;
struct VP9_COMP;
void vp9_set_speed_features_framesize_independent(struct VP9_COMP *cpi, int speed); void vp9_set_speed_features_framesize_dependent(struct VP9_COMP *cpi, int speed);
#ifdef __cplusplus
} // extern "C" #endif
#endif// VPX_VP9_ENCODER_VP9_SPEED_FEATURES_H_
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