2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #ifndef VP9_ENCODER_VP9_SPEED_FEATURES_H_
12 #define VP9_ENCODER_VP9_SPEED_FEATURES_H_
14 #include "vp9/common/vp9_enums.h"
33 // Allow recode for KF and exceeding maximum frame bandwidth.
34 ALLOW_RECODE_KFMAXBW = 1,
35 // Allow recode only for KF/ARF/GF frames.
36 ALLOW_RECODE_KFARFGF = 2,
37 // Allow recode for all frames based on bitrate constraints.
43 // Other methods to come
44 } SUBPEL_SEARCH_METHODS;
47 LAST_FRAME_PARTITION_OFF = 0,
48 LAST_FRAME_PARTITION_LOW_MOTION = 1,
49 LAST_FRAME_PARTITION_ALL = 2
50 } LAST_FRAME_PARTITION_METHOD;
55 USE_LARGESTINTRA_MODELINTER,
57 } TX_SIZE_SEARCH_METHOD;
61 RELAXED_NEIGHBORING_MIN_MAX = 1,
62 STRICT_NEIGHBORING_MIN_MAX = 2
66 // Try the full image with different values.
67 LPF_PICK_FROM_FULL_IMAGE,
68 // Try a small portion of the image with different values.
69 LPF_PICK_FROM_SUBIMAGE,
70 // Estimate the level based on quantizer and frame type
75 // Terminate search early based on distortion so far compared to
76 // qp step, distortion in the neighborhood of the frame, etc.
77 FLAG_EARLY_TERMINATE = 1 << 0,
79 // Skips comp inter modes if the best so far is an intra mode.
80 FLAG_SKIP_COMP_BESTINTRA = 1 << 1,
82 // Skips comp inter modes if the best single intermode so far does
83 // not have the same reference as one of the two references being
85 FLAG_SKIP_COMP_REFMISMATCH = 1 << 2,
87 // Skips oblique intra modes if the best so far is an inter mode.
88 FLAG_SKIP_INTRA_BESTINTER = 1 << 3,
90 // Skips oblique intra modes at angles 27, 63, 117, 153 if the best
91 // intra so far is not one of the neighboring directions.
92 FLAG_SKIP_INTRA_DIRMISMATCH = 1 << 4,
94 // Skips intra modes other than DC_PRED if the source variance is small
95 FLAG_SKIP_INTRA_LOWVAR = 1 << 5,
96 } MODE_SEARCH_SKIP_LOGIC;
99 // Search partitions using RD/NONRD criterion
100 SEARCH_PARTITION = 0,
102 // Always use a fixed size partition
105 // Use a fixed size partition in every 64X64 SB, where the size is
106 // determined based on source variance
107 VAR_BASED_FIXED_PARTITION = 2,
109 REFERENCE_PARTITION = 3,
111 // Use an arbitrary partitioning scheme based on source variance within
115 // Use non-fixed partitions based on source variance
116 SOURCE_VAR_BASED_PARTITION
117 } PARTITION_SEARCH_TYPE;
120 // Does a dry run to see if any of the contexts need to be updated or not,
121 // before the final run.
124 // No dry run conducted.
127 // No dry run, also only half the coef contexts and bands are updated.
128 // The rest are not updated at all.
132 typedef struct SPEED_FEATURES {
133 // Frame level coding parameter update
134 int frame_parameter_update;
136 // Motion search method (Diamond, NSTEP, Hex, Big Diamond, Square, etc).
137 SEARCH_METHODS search_method;
139 RECODE_LOOP_TYPE recode_loop;
141 // Subpel_search_method can only be subpel_tree which does a subpixel
142 // logarithmic search that keeps stepping at 1/2 pixel units until
143 // you stop getting a gain, and then goes on to 1/4 and repeats
144 // the same process. Along the way it skips many diagonals.
145 SUBPEL_SEARCH_METHODS subpel_search_method;
147 // Maximum number of steps in logarithmic subpel search before giving up.
148 int subpel_iters_per_step;
150 // Control when to stop subpel search
151 int subpel_force_stop;
153 // This parameter controls the number of steps we'll do in a diamond
155 int max_step_search_steps;
157 // This parameter controls which step in the n-step process we start at.
158 // It's changed adaptively based on circumstances.
159 int reduce_first_step_size;
161 // If this is set to 1, we limit the motion search range to 2 times the
162 // largest motion vector found in the last frame.
163 int auto_mv_step_size;
165 // Trellis (dynamic programming) optimization of quantized values (+1, 0).
166 int optimize_coefficients;
168 // Always set to 0. If on it enables 0 cost background transmission
169 // (except for the initial transmission of the segmentation). The feature is
170 // disabled because the addition of very large block sizes make the
171 // backgrounds very to cheap to encode, and the segmentation we have
173 int static_segmentation;
175 // If 1 we iterate finding a best reference for 2 ref frames together - via
176 // a log search that iterates 4 times (check around mv for last for best
177 // error of combined predictor then check around mv for alt). If 0 we
178 // we just use the best motion vector found for each frame by itself.
179 int comp_inter_joint_search_thresh;
181 // This variable is used to cap the maximum number of times we skip testing a
182 // mode to be evaluated. A high value means we will be faster.
183 int adaptive_rd_thresh;
185 // Enables skipping the reconstruction step (idct, recon) in the
186 // intermediate steps assuming the last frame didn't have too many intra
187 // blocks and the q is less than a threshold.
189 int skip_encode_frame;
190 // Speed feature to allow or disallow skipping of recode at block
191 // level within a frame.
192 int allow_skip_recode;
194 // This variable allows us to reuse the last frames partition choices
195 // (64x64 v 32x32 etc) for this frame. It can be set to only use the last
196 // frame as a starting point in low motion scenes or always use it. If set
197 // we use last partitioning_redo frequency to determine how often to redo
198 // the partitioning from scratch. Adjust_partitioning_from_last_frame
199 // enables us to adjust up or down one partitioning from the last frames
201 LAST_FRAME_PARTITION_METHOD use_lastframe_partitioning;
203 // Determine which method we use to determine transform size. We can choose
204 // between options like full rd, largest for prediction size, largest
205 // for intra and model coefs for the rest.
206 TX_SIZE_SEARCH_METHOD tx_size_search_method;
208 // Low precision 32x32 fdct keeps everything in 16 bits and thus is less
209 // precise but significantly faster than the non lp version.
212 // TODO(JBB): remove this as its no longer used.
214 // After looking at the first set of modes (set by index here), skip
215 // checking modes for reference frames that don't match the reference frame
216 // of the best so far.
219 // TODO(JBB): Remove this.
220 int reference_masking;
222 PARTITION_SEARCH_TYPE partition_search_type;
224 // Used if partition_search_type = FIXED_SIZE_PARTITION
225 BLOCK_SIZE always_this_block_size;
227 // Skip rectangular partition test when partition type none gives better
228 // rd than partition type split.
229 int less_rectangular_check;
231 // Disable testing non square partitions. (eg 16x32)
232 int use_square_partition_only;
234 // Sets min and max partition sizes for this 64x64 region based on the
235 // same 64x64 in last encoded frame, and the left and above neighbor.
236 AUTO_MIN_MAX_MODE auto_min_max_partition_size;
238 // Min and max partition size we enable (block_size) as per auto
239 // min max, but also used by adjust partitioning, and pick_partitioning.
240 BLOCK_SIZE min_partition_size;
241 BLOCK_SIZE max_partition_size;
243 // Whether or not we allow partitions one smaller or one greater than the last
244 // frame's partitioning. Only used if use_lastframe_partitioning is set.
245 int adjust_partitioning_from_last_frame;
247 // How frequently we re do the partitioning from scratch. Only used if
248 // use_lastframe_partitioning is set.
249 int last_partitioning_redo_frequency;
251 // This enables constrained copy partitioning, which, given an input block
252 // size bsize, will copy previous partition for partitions less than bsize,
253 // otherwise bsize partition is used. bsize is currently set to 16x16.
254 // Used for the case where motion is detected in superblock.
255 int constrain_copy_partition;
257 // Disables sub 8x8 blocksizes in different scenarios: Choices are to disable
258 // it always, to allow it for only Last frame and Intra, disable it for all
259 // inter modes or to enable it always.
260 int disable_split_mask;
262 // TODO(jingning): combine the related motion search speed features
263 // This allows us to use motion search at other sizes as a starting
264 // point for this motion search and limits the search range around it.
265 int adaptive_motion_search;
267 // Allows sub 8x8 modes to use the prediction filter that was determined
268 // best for 8x8 mode. If set to 0 we always re check all the filters for
269 // sizes less than 8x8, 1 means we check all filter modes if no 8x8 filter
270 // was selected, and 2 means we use 8 tap if no 8x8 filter mode was selected.
271 int adaptive_pred_interp_filter;
273 // Search through variable block partition types in non-RD mode decision
274 // encoding process for RTC.
277 // Chessboard pattern index
278 int chessboard_index;
280 // Use finer quantizer in every other few frames that run variable block
281 // partition type search.
282 int force_frame_boost;
284 // Maximally allowed base quantization index fluctuation.
285 int max_delta_qindex;
287 // Implements various heuristics to skip searching modes
288 // The heuristics selected are based on flags
289 // defined in the MODE_SEARCH_SKIP_HEURISTICS enum
290 unsigned int mode_search_skip_flags;
292 // A source variance threshold below which the split mode is disabled
293 unsigned int disable_split_var_thresh;
295 // A source variance threshold below which filter search is disabled
296 // Choose a very large value (UINT_MAX) to use 8-tap always
297 unsigned int disable_filter_search_var_thresh;
299 // These bit masks allow you to enable or disable intra modes for each
300 // transform size separately.
301 int intra_y_mode_mask[TX_SIZES];
302 int intra_uv_mode_mask[TX_SIZES];
304 // This variable enables an early break out of mode testing if the model for
305 // rd built from the prediction signal indicates a value that's much
306 // higher than the best rd we've seen so far.
309 // This enables us to use an estimate for intra rd based on dc mode rather
310 // than choosing an actual uv mode in the stage of encoding before the actual
312 int use_uv_intra_rd_estimate;
314 // This feature controls how the loop filter level is determined.
315 LPF_PICK_METHOD lpf_pick;
317 // This feature limits the number of coefficients updates we actually do
318 // by only looking at counts from 1/2 the bands.
319 FAST_COEFF_UPDATE use_fast_coef_updates;
321 // This flag controls the use of non-RD mode decision.
322 int use_nonrd_pick_mode;
324 // This variable sets the encode_breakout threshold. Currently, it is only
325 // enabled in real time mode.
326 int encode_breakout_thresh;
328 // A binary mask indicating if NEARESTMV, NEARMV, ZEROMV, NEWMV
329 // modes are disabled in order from LSB to MSB for each BLOCK_SIZE.
330 int disable_inter_mode_mask[BLOCK_SIZES];
332 // This feature controls whether we do the expensive context update and
333 // calculation in the rd coefficient costing loop.
334 int use_fast_coef_costing;
336 // This feature controls the tolerence vs target used in deciding whether to
337 // recode a frame. It has no meaning if recode is disabled.
338 int recode_tolerance;
340 // This variable controls the maximum block size where intra blocks can be
341 // used in inter frames.
342 // TODO(aconverse): Fold this into one of the other many mode skips
343 BLOCK_SIZE max_intra_bsize;
345 // The frequency that we check if SOURCE_VAR_BASED_PARTITION or
346 // FIXED_PARTITION search type should be used.
347 int search_type_check_frequency;
349 // The threshold used in SOURCE_VAR_BASED_PARTITION search type.
350 unsigned int source_var_thresh;
355 void vp9_set_speed_features(struct VP9_COMP *cpi);
361 #endif // VP9_ENCODER_VP9_SPEED_FEATURES_H_