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Commit 0a6d5547 authored by Dmitry Kovalev's avatar Dmitry Kovalev
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Adding vp9_speed_features.{h, c}. 

Change-Id: I7d9874da8ff78a2d7e0cf11073af9c30538bc9a6
parent 2b58730a
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vp9/encoder/vp9_onyx_if.c
View file @ 0a6d5547
......@@ -44,12 +44,6 @@
#include "vp9/encoder/vp9_resize.h"
#include "vp9/encoder/vp9_svc_layercontext.h"
#define ALL_INTRA_MODES 0x3FF
#define INTRA_DC_ONLY 0x01
#define INTRA_DC_TM ((1 << TM_PRED) | (1 << DC_PRED))
#define INTRA_DC_H_V ((1 << DC_PRED) | (1 << V_PRED) | (1 << H_PRED))
#define INTRA_DC_TM_H_V (INTRA_DC_TM | (1 << V_PRED) | (1 << H_PRED))
void vp9_coef_tree_initialize();
#define DEFAULT_INTERP_FILTER SWITCHABLE
......@@ -63,12 +57,6 @@ void vp9_coef_tree_initialize();
// now so that HIGH_PRECISION is always
// chosen.
// Masks for partially or completely disabling split mode
#define DISABLE_ALL_SPLIT 0x3F
#define DISABLE_ALL_INTER_SPLIT 0x1F
#define DISABLE_COMPOUND_SPLIT 0x18
#define LAST_AND_INTRA_SPLIT_ONLY 0x1E
// Max rate target for 1080P and below encodes under normal circumstances
// (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB
#define MAX_MB_RATE 250
......@@ -547,377 +535,23 @@ static void set_rd_speed_thresholds_sub8x8(VP9_COMP *cpi) {
cpi->rd_thresh_mult_sub8x8[THR_COMP_GA] = INT_MAX;
}
// Intra only frames, golden frames (except alt ref overlays) and
// alt ref frames tend to be coded at a higher than ambient quality
static INLINE int frame_is_boosted(const VP9_COMP *cpi) {
return frame_is_intra_only(&cpi->common) || cpi->refresh_alt_ref_frame ||
(cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref);
}
static void set_good_speed_feature(VP9_COMP *cpi,
VP9_COMMON *cm,
SPEED_FEATURES *sf,
int speed) {
int i;
sf->adaptive_rd_thresh = 1;
sf->recode_loop = ((speed < 1) ? ALLOW_RECODE : ALLOW_RECODE_KFMAXBW);
sf->allow_skip_recode = 1;
if (speed >= 1) {
sf->use_square_partition_only = !frame_is_intra_only(cm);
sf->less_rectangular_check = 1;
sf->tx_size_search_method = frame_is_boosted(cpi)
? USE_FULL_RD : USE_LARGESTALL;
if (MIN(cm->width, cm->height) >= 720)
sf->disable_split_mask = cm->show_frame ?
DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
else
sf->disable_split_mask = DISABLE_COMPOUND_SPLIT;
sf->use_rd_breakout = 1;
sf->adaptive_motion_search = 1;
sf->auto_mv_step_size = 1;
sf->adaptive_rd_thresh = 2;
sf->subpel_iters_per_step = 1;
sf->mode_skip_start = 10;
sf->adaptive_pred_interp_filter = 1;
sf->recode_loop = ALLOW_RECODE_KFARFGF;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_y_mode_mask[TX_16X16] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_16X16] = INTRA_DC_H_V;
}
// Additions or changes from speed 1 for speed >= 2.
if (speed >= 2) {
sf->tx_size_search_method = frame_is_boosted(cpi)
? USE_FULL_RD : USE_LARGESTALL;
if (MIN(cm->width, cm->height) >= 720)
sf->disable_split_mask = cm->show_frame ?
DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
else
sf->disable_split_mask = LAST_AND_INTRA_SPLIT_ONLY;
sf->adaptive_pred_interp_filter = 2;
sf->reference_masking = 1;
sf->mode_search_skip_flags = FLAG_SKIP_INTRA_DIRMISMATCH |
FLAG_SKIP_INTRA_BESTINTER |
FLAG_SKIP_COMP_BESTINTRA |
FLAG_SKIP_INTRA_LOWVAR;
sf->disable_filter_search_var_thresh = 100;
sf->comp_inter_joint_search_thresh = BLOCK_SIZES;
sf->auto_min_max_partition_size = RELAXED_NEIGHBORING_MIN_MAX;
sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_LOW_MOTION;
sf->adjust_partitioning_from_last_frame = 1;
sf->last_partitioning_redo_frequency = 3;
}
// Additions or changes for speed 3 and above
if (speed >= 3) {
if (MIN(cm->width, cm->height) >= 720)
sf->disable_split_mask = DISABLE_ALL_SPLIT;
else
sf->disable_split_mask = DISABLE_ALL_INTER_SPLIT;
sf->recode_loop = ALLOW_RECODE_KFMAXBW;
sf->adaptive_rd_thresh = 3;
sf->mode_skip_start = 6;
sf->use_fast_coef_updates = 2;
sf->use_fast_coef_costing = 1;
}
// Additions or changes for speed 3 and above
if (speed >= 4) {
sf->use_square_partition_only = 1;
sf->tx_size_search_method = USE_LARGESTALL;
sf->disable_split_mask = DISABLE_ALL_SPLIT;
sf->adaptive_rd_thresh = 4;
// Add a couple more skip flags
sf->mode_search_skip_flags |= FLAG_SKIP_COMP_REFMISMATCH |
FLAG_EARLY_TERMINATE;
sf->disable_filter_search_var_thresh = 200;
sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_ALL;
sf->use_lp32x32fdct = 1;
}
if (speed >= 5) {
sf->partition_search_type = FIXED_PARTITION;
sf->optimize_coefficients = 0;
sf->search_method = HEX;
sf->disable_filter_search_var_thresh = 500;
for (i = 0; i < TX_SIZES; i++) {
sf->intra_y_mode_mask[i] = INTRA_DC_ONLY;
sf->intra_uv_mode_mask[i] = INTRA_DC_ONLY;
}
cpi->allow_encode_breakout = ENCODE_BREAKOUT_ENABLED;
}
}
static void set_rt_speed_feature(VP9_COMMON *cm,
SPEED_FEATURES *sf,
int speed) {
sf->static_segmentation = 0;
sf->adaptive_rd_thresh = 1;
sf->encode_breakout_thresh = 1;
sf->use_fast_coef_costing = 1;
if (speed == 1) {
sf->use_square_partition_only = !frame_is_intra_only(cm);
sf->less_rectangular_check = 1;
sf->tx_size_search_method =
frame_is_intra_only(cm) ? USE_FULL_RD : USE_LARGESTALL;
if (MIN(cm->width, cm->height) >= 720)
sf->disable_split_mask = cm->show_frame ?
DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
else
sf->disable_split_mask = DISABLE_COMPOUND_SPLIT;
sf->use_rd_breakout = 1;
sf->adaptive_motion_search = 1;
sf->adaptive_pred_interp_filter = 1;
sf->auto_mv_step_size = 1;
sf->adaptive_rd_thresh = 2;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_16X16] = INTRA_DC_H_V;
sf->encode_breakout_thresh = 8;
}
if (speed >= 2) {
sf->use_square_partition_only = !frame_is_intra_only(cm);
sf->less_rectangular_check = 1;
sf->tx_size_search_method =
frame_is_intra_only(cm) ? USE_FULL_RD : USE_LARGESTALL;
if (MIN(cm->width, cm->height) >= 720)
sf->disable_split_mask = cm->show_frame ?
DISABLE_ALL_SPLIT : DISABLE_ALL_INTER_SPLIT;
else
sf->disable_split_mask = LAST_AND_INTRA_SPLIT_ONLY;
sf->mode_search_skip_flags = FLAG_SKIP_INTRA_DIRMISMATCH
| FLAG_SKIP_INTRA_BESTINTER | FLAG_SKIP_COMP_BESTINTRA
| FLAG_SKIP_INTRA_LOWVAR;
sf->use_rd_breakout = 1;
sf->adaptive_motion_search = 1;
sf->adaptive_pred_interp_filter = 2;
sf->auto_mv_step_size = 1;
sf->reference_masking = 1;
sf->disable_filter_search_var_thresh = 50;
sf->comp_inter_joint_search_thresh = BLOCK_SIZES;
sf->auto_min_max_partition_size = RELAXED_NEIGHBORING_MIN_MAX;
sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_LOW_MOTION;
sf->adjust_partitioning_from_last_frame = 1;
sf->last_partitioning_redo_frequency = 3;
sf->adaptive_rd_thresh = 2;
sf->use_lp32x32fdct = 1;
sf->mode_skip_start = 11;
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_y_mode_mask[TX_16X16] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_32X32] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[TX_16X16] = INTRA_DC_H_V;
sf->encode_breakout_thresh = 200;
}
if (speed >= 3) {
sf->use_square_partition_only = 1;
if (MIN(cm->width, cm->height) >= 720)
sf->disable_split_mask = DISABLE_ALL_SPLIT;
else
sf->disable_split_mask = DISABLE_ALL_INTER_SPLIT;
sf->mode_search_skip_flags = FLAG_SKIP_INTRA_DIRMISMATCH
| FLAG_SKIP_INTRA_BESTINTER | FLAG_SKIP_COMP_BESTINTRA
| FLAG_SKIP_INTRA_LOWVAR;
sf->disable_filter_search_var_thresh = 100;
sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_ALL;
sf->use_uv_intra_rd_estimate = 1;
sf->skip_encode_sb = 1;
sf->subpel_iters_per_step = 1;
sf->use_fast_coef_updates = 2;
sf->adaptive_rd_thresh = 4;
sf->mode_skip_start = 6;
sf->encode_breakout_thresh = 400;
sf->allow_skip_recode = 0;
}
if (speed >= 4) {
sf->optimize_coefficients = 0;
sf->disable_split_mask = DISABLE_ALL_SPLIT;
sf->lpf_pick = LPF_PICK_FROM_Q;
sf->encode_breakout_thresh = 700;
}
if (speed >= 5) {
int i;
sf->last_partitioning_redo_frequency = 4;
sf->adaptive_rd_thresh = 5;
sf->use_fast_coef_costing = 0;
sf->auto_min_max_partition_size = STRICT_NEIGHBORING_MIN_MAX;
sf->adjust_partitioning_from_last_frame =
cm->last_frame_type != cm->frame_type || (0 ==
(cm->current_video_frame + 1) % sf->last_partitioning_redo_frequency);
sf->subpel_force_stop = 1;
for (i = 0; i < TX_SIZES; i++) {
sf->intra_y_mode_mask[i] = INTRA_DC_H_V;
sf->intra_uv_mode_mask[i] = INTRA_DC_ONLY;
}
sf->intra_y_mode_mask[TX_32X32] = INTRA_DC_ONLY;
sf->frame_parameter_update = 0;
sf->encode_breakout_thresh = 1000;
sf->search_method = FAST_HEX;
sf->disable_inter_mode_mask[BLOCK_32X32] = 1 << INTER_OFFSET(ZEROMV);
sf->disable_inter_mode_mask[BLOCK_32X64] = ~(1 << INTER_OFFSET(NEARESTMV));
sf->disable_inter_mode_mask[BLOCK_64X32] = ~(1 << INTER_OFFSET(NEARESTMV));
sf->disable_inter_mode_mask[BLOCK_64X64] = ~(1 << INTER_OFFSET(NEARESTMV));
sf->max_intra_bsize = BLOCK_32X32;
sf->allow_skip_recode = 1;
}
if (speed >= 6) {
sf->max_partition_size = BLOCK_32X32;
sf->min_partition_size = BLOCK_8X8;
sf->partition_check =
(cm->current_video_frame % sf->last_partitioning_redo_frequency == 1);
sf->partition_search_type = REFERENCE_PARTITION;
sf->use_nonrd_pick_mode = 1;
sf->search_method = FAST_DIAMOND;
sf->allow_skip_recode = 0;
}
if (speed >= 7) {
sf->partition_search_type = VAR_BASED_FIXED_PARTITION;
sf->use_nonrd_pick_mode = 1;
sf->search_method = FAST_DIAMOND;
}
if (speed >= 8) {
int i;
for (i = 0; i < BLOCK_SIZES; ++i)
sf->disable_inter_mode_mask[i] = 14; // only search NEARESTMV (0)
}
}
void vp9_set_speed_features(VP9_COMP *cpi) {
SPEED_FEATURES *sf = &cpi->sf;
VP9_COMMON *cm = &cpi->common;
int speed = cpi->speed;
int i;
// Convert negative speed to positive
if (speed < 0)
speed = -speed;
static void set_speed_features(VP9_COMP *cpi) {
#if CONFIG_INTERNAL_STATS
int i;
for (i = 0; i < MAX_MODES; ++i)
cpi->mode_chosen_counts[i] = 0;
#endif
// best quality defaults
sf->frame_parameter_update = 1;
sf->search_method = NSTEP;
sf->recode_loop = ALLOW_RECODE;
sf->subpel_search_method = SUBPEL_TREE;
sf->subpel_iters_per_step = 2;
sf->subpel_force_stop = 0;
sf->optimize_coefficients = !cpi->oxcf.lossless;
sf->reduce_first_step_size = 0;
sf->auto_mv_step_size = 0;
sf->max_step_search_steps = MAX_MVSEARCH_STEPS;
sf->comp_inter_joint_search_thresh = BLOCK_4X4;
sf->adaptive_rd_thresh = 0;
sf->use_lastframe_partitioning = LAST_FRAME_PARTITION_OFF;
sf->tx_size_search_method = USE_FULL_RD;
sf->use_lp32x32fdct = 0;
sf->adaptive_motion_search = 0;
sf->adaptive_pred_interp_filter = 0;
sf->reference_masking = 0;
sf->partition_search_type = SEARCH_PARTITION;
sf->less_rectangular_check = 0;
sf->use_square_partition_only = 0;
sf->auto_min_max_partition_size = NOT_IN_USE;
sf->max_partition_size = BLOCK_64X64;
sf->min_partition_size = BLOCK_4X4;
sf->adjust_partitioning_from_last_frame = 0;
sf->last_partitioning_redo_frequency = 4;
sf->disable_split_mask = 0;
sf->mode_search_skip_flags = 0;
sf->disable_split_var_thresh = 0;
sf->disable_filter_search_var_thresh = 0;
for (i = 0; i < TX_SIZES; i++) {
sf->intra_y_mode_mask[i] = ALL_INTRA_MODES;
sf->intra_uv_mode_mask[i] = ALL_INTRA_MODES;
}
sf->use_rd_breakout = 0;
sf->skip_encode_sb = 0;
sf->use_uv_intra_rd_estimate = 0;
sf->allow_skip_recode = 0;
sf->lpf_pick = LPF_PICK_FROM_FULL_IMAGE;
sf->use_fast_coef_updates = 0;
sf->use_fast_coef_costing = 0;
sf->mode_skip_start = MAX_MODES; // Mode index at which mode skip mask set
sf->use_nonrd_pick_mode = 0;
sf->encode_breakout_thresh = 0;
for (i = 0; i < BLOCK_SIZES; ++i)
sf->disable_inter_mode_mask[i] = 0;
sf->max_intra_bsize = BLOCK_64X64;
// This setting only takes effect when partition_search_type is set
// to FIXED_PARTITION.
sf->always_this_block_size = BLOCK_16X16;
switch (cpi->oxcf.mode) {
case MODE_BESTQUALITY:
case MODE_SECONDPASS_BEST: // This is the best quality mode.
cpi->diamond_search_sad = vp9_full_range_search;
break;
case MODE_FIRSTPASS:
case MODE_GOODQUALITY:
case MODE_SECONDPASS:
set_good_speed_feature(cpi, cm, sf, speed);
break;
case MODE_REALTIME:
set_rt_speed_feature(cm, sf, speed);
break;
}; /* switch */
vp9_set_speed_features(cpi);
// Set rd thresholds based on mode and speed setting
set_rd_speed_thresholds(cpi);
set_rd_speed_thresholds_sub8x8(cpi);
// Slow quant, dct and trellis not worthwhile for first pass
// so make sure they are always turned off.
if (cpi->pass == 1) {
sf->optimize_coefficients = 0;
}
// No recode for 1 pass.
if (cpi->pass == 0) {
sf->recode_loop = DISALLOW_RECODE;
sf->optimize_coefficients = 0;
}
cpi->mb.fwd_txm4x4 = vp9_fdct4x4;
if (cpi->oxcf.lossless || cpi->mb.e_mbd.lossless) {
cpi->mb.fwd_txm4x4 = vp9_fwht4x4;
}
if (cpi->sf.subpel_search_method == SUBPEL_TREE) {
cpi->find_fractional_mv_step = vp9_find_best_sub_pixel_tree;
cpi->find_fractional_mv_step_comp = vp9_find_best_sub_pixel_comp_tree;
}
cpi->mb.optimize = cpi->sf.optimize_coefficients == 1 && cpi->pass != 1;
if (cpi->encode_breakout && cpi->oxcf.mode == MODE_REALTIME &&
sf->encode_breakout_thresh > cpi->encode_breakout)
cpi->encode_breakout = sf->encode_breakout_thresh;
if (sf->disable_split_mask == DISABLE_ALL_SPLIT)
sf->adaptive_pred_interp_filter = 0;
}
static void alloc_raw_frame_buffers(VP9_COMP *cpi) {
......@@ -1736,7 +1370,7 @@ VP9_COMP *vp9_create_compressor(VP9_CONFIG *oxcf) {
vp9_init_second_pass(cpi);
}
vp9_set_speed_features(cpi);
set_speed_features(cpi);
// Default rd threshold factors for mode selection
for (i = 0; i < BLOCK_SIZES; ++i) {
......@@ -3042,7 +2676,7 @@ static void encode_frame_to_data_rate(VP9_COMP *cpi,
set_high_precision_mv(cpi, q < HIGH_PRECISION_MV_QTHRESH);
}
vp9_set_speed_features(cpi);
set_speed_features(cpi);
if (cpi->sf.recode_loop == DISALLOW_RECODE) {
encode_without_recode_loop(cpi, size, dest, q);
......
vp9/encoder/vp9_onyx_int.h
View file @ 0a6d5547
......@@ -31,6 +31,7 @@
#include "vp9/encoder/vp9_mcomp.h"
#include "vp9/encoder/vp9_quantize.h"
#include "vp9/encoder/vp9_ratectrl.h"
#include "vp9/encoder/vp9_speed_features.h"
#include "vp9/encoder/vp9_svc_layercontext.h"
#include "vp9/encoder/vp9_tokenize.h"
#include "vp9/encoder/vp9_variance.h"
......@@ -114,75 +115,6 @@ typedef enum {
THR_INTRA,
} THR_MODES_SUB8X8;
typedef enum {
DIAMOND = 0,
NSTEP = 1,
HEX = 2,
BIGDIA = 3,
SQUARE = 4,
FAST_HEX = 5,
FAST_DIAMOND = 6
} SEARCH_METHODS;
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 {
// 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 {
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 {
// 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 {
// encode_breakout is disabled.
ENCODE_BREAKOUT_DISABLED = 0,
......@@ -192,227 +124,6 @@ typedef enum {
ENCODE_BREAKOUT_LIMITED = 2
} ENCODE_BREAKOUT_TYPE;
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
} PARTITION_SEARCH_TYPE;
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 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.