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/*
* Copyright (c) 2020, 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.
*/
#include "aom_dsp/binary_codes_writer.h"
#include "aom_dsp/flow_estimation/corner_detect.h"
#include "aom_dsp/flow_estimation/flow_estimation.h"
#include "av1/common/warped_motion.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/ethread.h"
#include "av1/encoder/rdopt.h"
// Highest motion model to search.
#define GLOBAL_TRANS_TYPES_ENC 3
// Computes the cost for the warp parameters.
static int gm_get_params_cost(const WarpedMotionParams *gm,
const WarpedMotionParams *ref_gm, int allow_hp) {
int params_cost = 0;
int trans_bits, trans_prec_diff;
switch (gm->wmtype) {
case AFFINE:
case ROTZOOM:
params_cost += aom_count_signed_primitive_refsubexpfin(
GM_ALPHA_MAX + 1, SUBEXPFIN_K,
(ref_gm->wmmat[2] >> GM_ALPHA_PREC_DIFF) - (1 << GM_ALPHA_PREC_BITS),
(gm->wmmat[2] >> GM_ALPHA_PREC_DIFF) - (1 << GM_ALPHA_PREC_BITS));
params_cost += aom_count_signed_primitive_refsubexpfin(
GM_ALPHA_MAX + 1, SUBEXPFIN_K,
(ref_gm->wmmat[3] >> GM_ALPHA_PREC_DIFF),
(gm->wmmat[3] >> GM_ALPHA_PREC_DIFF));
if (gm->wmtype >= AFFINE) {
params_cost += aom_count_signed_primitive_refsubexpfin(
GM_ALPHA_MAX + 1, SUBEXPFIN_K,
(ref_gm->wmmat[4] >> GM_ALPHA_PREC_DIFF),
(gm->wmmat[4] >> GM_ALPHA_PREC_DIFF));
params_cost += aom_count_signed_primitive_refsubexpfin(
GM_ALPHA_MAX + 1, SUBEXPFIN_K,
(ref_gm->wmmat[5] >> GM_ALPHA_PREC_DIFF) -
(1 << GM_ALPHA_PREC_BITS),
(gm->wmmat[5] >> GM_ALPHA_PREC_DIFF) - (1 << GM_ALPHA_PREC_BITS));
}
AOM_FALLTHROUGH_INTENDED;
case TRANSLATION:
trans_bits = (gm->wmtype == TRANSLATION)
? GM_ABS_TRANS_ONLY_BITS - !allow_hp
: GM_ABS_TRANS_BITS;
trans_prec_diff = (gm->wmtype == TRANSLATION)
? GM_TRANS_ONLY_PREC_DIFF + !allow_hp
: GM_TRANS_PREC_DIFF;
params_cost += aom_count_signed_primitive_refsubexpfin(
(1 << trans_bits) + 1, SUBEXPFIN_K,
(ref_gm->wmmat[0] >> trans_prec_diff),
(gm->wmmat[0] >> trans_prec_diff));
params_cost += aom_count_signed_primitive_refsubexpfin(
(1 << trans_bits) + 1, SUBEXPFIN_K,
(ref_gm->wmmat[1] >> trans_prec_diff),
(gm->wmmat[1] >> trans_prec_diff));
AOM_FALLTHROUGH_INTENDED;
case IDENTITY: break;
default: assert(0);
}
return (params_cost << AV1_PROB_COST_SHIFT);
}
// Calculates the threshold to be used for warp error computation.
static AOM_INLINE int64_t calc_erroradv_threshold(int64_t ref_frame_error) {
return (int64_t)(ref_frame_error * erroradv_tr + 0.5);
}
// For the given reference frame, computes the global motion parameters for
// different motion models and finds the best.
static AOM_INLINE void compute_global_motion_for_ref_frame(
AV1_COMP *cpi, YV12_BUFFER_CONFIG *ref_buf[REF_FRAMES], int frame,
int num_src_corners, int *src_corners, unsigned char *src_buffer,
MotionModel *params_by_motion, uint8_t *segment_map,
const int segment_map_w, const int segment_map_h,
const WarpedMotionParams *ref_params) {
ThreadData *const td = &cpi->td;
MACROBLOCK *const x = &td->mb;
AV1_COMMON *const cm = &cpi->common;
MACROBLOCKD *const xd = &x->e_mbd;
int i;
int src_width = cpi->source->y_width;
int src_height = cpi->source->y_height;
int src_stride = cpi->source->y_stride;
// clang-format off
static const double kIdentityParams[MAX_PARAMDIM - 1] = {
0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0
};
// clang-format on
WarpedMotionParams tmp_wm_params;
const double *params_this_motion;
int inliers_by_motion[RANSAC_NUM_MOTIONS];
assert(ref_buf[frame] != NULL);
TransformationType model;
// TODO(sarahparker, debargha): Explore do_adaptive_gm_estimation = 1
const int do_adaptive_gm_estimation = 0;
const int ref_frame_dist = get_relative_dist(
&cm->seq_params->order_hint_info, cm->current_frame.order_hint,
cm->cur_frame->ref_order_hints[frame - LAST_FRAME]);
const GlobalMotionEstimationType gm_estimation_type =
cm->seq_params->order_hint_info.enable_order_hint &&
abs(ref_frame_dist) <= 2 && do_adaptive_gm_estimation
? GLOBAL_MOTION_DISFLOW_BASED
: GLOBAL_MOTION_FEATURE_BASED;
for (model = ROTZOOM; model < GLOBAL_TRANS_TYPES_ENC; ++model) {
int64_t best_warp_error = INT64_MAX;
// Initially set all params to identity.
for (i = 0; i < RANSAC_NUM_MOTIONS; ++i) {
memcpy(params_by_motion[i].params, kIdentityParams,
(MAX_PARAMDIM - 1) * sizeof(*(params_by_motion[i].params)));
params_by_motion[i].num_inliers = 0;
}
aom_compute_global_motion(model, src_buffer, src_width, src_height,
src_stride, src_corners, num_src_corners,
ref_buf[frame], cpi->common.seq_params->bit_depth,
gm_estimation_type, inliers_by_motion,
params_by_motion, RANSAC_NUM_MOTIONS);
int64_t ref_frame_error = 0;
for (i = 0; i < RANSAC_NUM_MOTIONS; ++i) {
if (inliers_by_motion[i] == 0) continue;
params_this_motion = params_by_motion[i].params;
av1_convert_model_to_params(params_this_motion, &tmp_wm_params);
// Work around a bug in the AV1 specification
//
// For TRANSLATION type global motion models, gm_get_motion_vector() gives
// the wrong motion vector (see comments in that function for details).
// As translation-type models do not give much gain, we can avoid this bug
// by never choosing a TRANSLATION type model
if (tmp_wm_params.wmtype == TRANSLATION) {
continue;
}
if (tmp_wm_params.wmtype != IDENTITY) {
av1_compute_feature_segmentation_map(
segment_map, segment_map_w, segment_map_h,
params_by_motion[i].inliers, params_by_motion[i].num_inliers);
ref_frame_error = av1_segmented_frame_error(
is_cur_buf_hbd(xd), xd->bd, ref_buf[frame]->y_buffer,
ref_buf[frame]->y_stride, cpi->source->y_buffer, src_width,
src_height, src_stride, segment_map, segment_map_w);
const int64_t erroradv_threshold =
calc_erroradv_threshold(ref_frame_error);
const int64_t warp_error = av1_refine_integerized_param(
&tmp_wm_params, tmp_wm_params.wmtype, is_cur_buf_hbd(xd), xd->bd,
ref_buf[frame]->y_buffer, ref_buf[frame]->y_width,
ref_buf[frame]->y_height, ref_buf[frame]->y_stride,
cpi->source->y_buffer, src_width, src_height, src_stride,
GM_REFINEMENT_COUNT, best_warp_error, segment_map, segment_map_w,
erroradv_threshold);
// av1_refine_integerized_param() can return a TRANSLATION type model
// even if its input is some other type, so we have to skip those too
if (tmp_wm_params.wmtype == TRANSLATION) {
continue;
}
if (warp_error < best_warp_error) {
best_warp_error = warp_error;
// Save the wm_params modified by
// av1_refine_integerized_param() rather than motion index to
// avoid rerunning refine() below.
memcpy(&(cm->global_motion[frame]), &tmp_wm_params,
sizeof(WarpedMotionParams));
}
}
}
if (cm->global_motion[frame].wmtype <= AFFINE)
if (!av1_get_shear_params(&cm->global_motion[frame]))
cm->global_motion[frame] = default_warp_params;
#if 0
// We never choose translational models, so this code is disabled
if (cm->global_motion[frame].wmtype == TRANSLATION) {
cm->global_motion[frame].wmmat[0] =
convert_to_trans_prec(cm->features.allow_high_precision_mv,
cm->global_motion[frame].wmmat[0]) *
GM_TRANS_ONLY_DECODE_FACTOR;
cm->global_motion[frame].wmmat[1] =
convert_to_trans_prec(cm->features.allow_high_precision_mv,
cm->global_motion[frame].wmmat[1]) *
GM_TRANS_ONLY_DECODE_FACTOR;
}
#endif
if (cm->global_motion[frame].wmtype == IDENTITY) continue;
if (ref_frame_error == 0) continue;
// If the best error advantage found doesn't meet the threshold for
// this motion type, revert to IDENTITY.
if (!av1_is_enough_erroradvantage(
(double)best_warp_error / ref_frame_error,
gm_get_params_cost(&cm->global_motion[frame], ref_params,
cm->features.allow_high_precision_mv))) {
cm->global_motion[frame] = default_warp_params;
}
if (cm->global_motion[frame].wmtype != IDENTITY) break;
}
}
// Computes global motion for the given reference frame.
void av1_compute_gm_for_valid_ref_frames(
AV1_COMP *cpi, YV12_BUFFER_CONFIG *ref_buf[REF_FRAMES], int frame,
int num_src_corners, int *src_corners, unsigned char *src_buffer,
MotionModel *params_by_motion, uint8_t *segment_map, int segment_map_w,
int segment_map_h) {
AV1_COMMON *const cm = &cpi->common;
const WarpedMotionParams *ref_params =
cm->prev_frame ? &cm->prev_frame->global_motion[frame]
: &default_warp_params;
compute_global_motion_for_ref_frame(
cpi, ref_buf, frame, num_src_corners, src_corners, src_buffer,
params_by_motion, segment_map, segment_map_w, segment_map_h, ref_params);
}
// Loops over valid reference frames and computes global motion estimation.
static AOM_INLINE void compute_global_motion_for_references(
AV1_COMP *cpi, YV12_BUFFER_CONFIG *ref_buf[REF_FRAMES],
FrameDistPair reference_frame[REF_FRAMES - 1], int num_ref_frames,
int num_src_corners, int *src_corners, unsigned char *src_buffer,
MotionModel *params_by_motion, uint8_t *segment_map,
const int segment_map_w, const int segment_map_h) {
// Computation of frame corners for the source frame will be done already.
assert(num_src_corners != -1);
AV1_COMMON *const cm = &cpi->common;
// Compute global motion w.r.t. reference frames starting from the nearest ref
// frame in a given direction.
for (int frame = 0; frame < num_ref_frames; frame++) {
int ref_frame = reference_frame[frame].frame;
av1_compute_gm_for_valid_ref_frames(
cpi, ref_buf, ref_frame, num_src_corners, src_corners, src_buffer,
params_by_motion, segment_map, segment_map_w, segment_map_h);
// If global motion w.r.t. current ref frame is
// INVALID/TRANSLATION/IDENTITY, skip the evaluation of global motion w.r.t
// the remaining ref frames in that direction. The below exit is disabled
// when ref frame distance w.r.t. current frame is zero. E.g.:
// source_alt_ref_frame w.r.t. ARF frames.
if (cpi->sf.gm_sf.prune_ref_frame_for_gm_search &&
reference_frame[frame].distance != 0 &&
cm->global_motion[ref_frame].wmtype != ROTZOOM)
break;
}
}
// Compares the distance in 'a' and 'b'. Returns 1 if the frame corresponding to
// 'a' is farther, -1 if the frame corresponding to 'b' is farther, 0 otherwise.
static int compare_distance(const void *a, const void *b) {
const int diff =
((FrameDistPair *)a)->distance - ((FrameDistPair *)b)->distance;
if (diff > 0)
return 1;
else if (diff < 0)
return -1;
return 0;
}
static int disable_gm_search_based_on_stats(const AV1_COMP *const cpi) {
int is_gm_present = 1;
// Check number of GM models only in GF groups with ARF frames. GM param
// estimation is always done in the case of GF groups with no ARF frames (flat
// gops)
if (cpi->ppi->gf_group.arf_index > -1) {
// valid_gm_model_found is initialized to INT32_MAX in the beginning of
// every GF group.
// Therefore, GM param estimation is always done for all frames until
// at least 1 frame each of ARF_UPDATE, INTNL_ARF_UPDATE and LF_UPDATE are
// encoded in a GF group For subsequent frames, GM param estimation is
// disabled, if no valid models have been found in all the three update
// types.
is_gm_present = (cpi->ppi->valid_gm_model_found[ARF_UPDATE] != 0) ||
(cpi->ppi->valid_gm_model_found[INTNL_ARF_UPDATE] != 0) ||
(cpi->ppi->valid_gm_model_found[LF_UPDATE] != 0);
}
return !is_gm_present;
}
// Prunes reference frames for global motion estimation based on the speed
// feature 'gm_search_type'.
static int do_gm_search_logic(SPEED_FEATURES *const sf, int frame) {
(void)frame;
switch (sf->gm_sf.gm_search_type) {
case GM_FULL_SEARCH: return 1;
case GM_REDUCED_REF_SEARCH_SKIP_L2_L3:
return !(frame == LAST2_FRAME || frame == LAST3_FRAME);
case GM_REDUCED_REF_SEARCH_SKIP_L2_L3_ARF2:
return !(frame == LAST2_FRAME || frame == LAST3_FRAME ||
(frame == ALTREF2_FRAME));
case GM_DISABLE_SEARCH: return 0;
default: assert(0);
}
return 1;
}
// Populates valid reference frames in past/future directions in
// 'reference_frames' and their count in 'num_ref_frames'.
static AOM_INLINE void update_valid_ref_frames_for_gm(
AV1_COMP *cpi, YV12_BUFFER_CONFIG *ref_buf[REF_FRAMES],
FrameDistPair reference_frames[MAX_DIRECTIONS][REF_FRAMES - 1],
int *num_ref_frames) {
AV1_COMMON *const cm = &cpi->common;
int *num_past_ref_frames = &num_ref_frames[0];
int *num_future_ref_frames = &num_ref_frames[1];
const GF_GROUP *gf_group = &cpi->ppi->gf_group;
int ref_pruning_enabled = is_frame_eligible_for_ref_pruning(
gf_group, cpi->sf.inter_sf.selective_ref_frame, 1, cpi->gf_frame_index);
int cur_frame_gm_disabled = 0;
if (cpi->sf.gm_sf.disable_gm_search_based_on_stats) {
cur_frame_gm_disabled = disable_gm_search_based_on_stats(cpi);
}
for (int frame = ALTREF_FRAME; frame >= LAST_FRAME; --frame) {
const MV_REFERENCE_FRAME ref_frame[2] = { frame, NONE_FRAME };
RefCntBuffer *buf = get_ref_frame_buf(cm, frame);
const int ref_disabled =
!(cpi->ref_frame_flags & av1_ref_frame_flag_list[frame]);
ref_buf[frame] = NULL;
cm->global_motion[frame] = default_warp_params;
// Skip global motion estimation for invalid ref frames
if (buf == NULL ||
(ref_disabled && cpi->sf.hl_sf.recode_loop != DISALLOW_RECODE)) {
continue;
} else {
ref_buf[frame] = &buf->buf;
}
int prune_ref_frames =
ref_pruning_enabled &&
prune_ref_by_selective_ref_frame(cpi, NULL, ref_frame,
cm->cur_frame->ref_display_order_hint);
if (ref_buf[frame]->y_crop_width == cpi->source->y_crop_width &&
ref_buf[frame]->y_crop_height == cpi->source->y_crop_height &&
do_gm_search_logic(&cpi->sf, frame) && !prune_ref_frames &&
!cur_frame_gm_disabled) {
assert(ref_buf[frame] != NULL);
const int relative_frame_dist = av1_encoder_get_relative_dist(
buf->display_order_hint, cm->cur_frame->display_order_hint);
// Populate past and future ref frames.
// reference_frames[0][] indicates past direction and
// reference_frames[1][] indicates future direction.
if (relative_frame_dist <= 0) {
reference_frames[0][*num_past_ref_frames].distance =
abs(relative_frame_dist);
reference_frames[0][*num_past_ref_frames].frame = frame;
(*num_past_ref_frames)++;
} else {
reference_frames[1][*num_future_ref_frames].distance =
abs(relative_frame_dist);
reference_frames[1][*num_future_ref_frames].frame = frame;
(*num_future_ref_frames)++;
}
}
}
}
// Deallocates segment_map and inliers.
static AOM_INLINE void dealloc_global_motion_data(MotionModel *params_by_motion,
uint8_t *segment_map) {
aom_free(segment_map);
for (int m = 0; m < RANSAC_NUM_MOTIONS; m++) {
aom_free(params_by_motion[m].inliers);
}
}
// Allocates and initializes memory for segment_map and MotionModel.
static AOM_INLINE bool alloc_global_motion_data(MotionModel *params_by_motion,
uint8_t **segment_map,
const int segment_map_w,
const int segment_map_h) {
av1_zero_array(params_by_motion, RANSAC_NUM_MOTIONS);
for (int m = 0; m < RANSAC_NUM_MOTIONS; m++) {
params_by_motion[m].inliers =
aom_malloc(sizeof(*(params_by_motion[m].inliers)) * 2 * MAX_CORNERS);
if (!params_by_motion[m].inliers) {
dealloc_global_motion_data(params_by_motion, NULL);
return false;
}
}
*segment_map = (uint8_t *)aom_calloc(segment_map_w * segment_map_h,
sizeof(*segment_map));
if (!*segment_map) {
dealloc_global_motion_data(params_by_motion, NULL);
return false;
}
return true;
}
// Initializes parameters used for computing global motion.
static AOM_INLINE void setup_global_motion_info_params(AV1_COMP *cpi) {
GlobalMotionInfo *const gm_info = &cpi->gm_info;
YV12_BUFFER_CONFIG *source = cpi->source;
gm_info->src_buffer = source->y_buffer;
if (source->flags & YV12_FLAG_HIGHBITDEPTH) {
// The source buffer is 16-bit, so we need to convert to 8 bits for the
// following code. We cache the result until the source frame is released.
gm_info->src_buffer =
av1_downconvert_frame(source, cpi->common.seq_params->bit_depth);
}
gm_info->segment_map_w =
(source->y_width + WARP_ERROR_BLOCK) >> WARP_ERROR_BLOCK_LOG;
gm_info->segment_map_h =
(source->y_height + WARP_ERROR_BLOCK) >> WARP_ERROR_BLOCK_LOG;
memset(gm_info->reference_frames, -1,
sizeof(gm_info->reference_frames[0][0]) * MAX_DIRECTIONS *
(REF_FRAMES - 1));
av1_zero(gm_info->num_ref_frames);
// Populate ref_buf for valid ref frames in global motion
update_valid_ref_frames_for_gm(cpi, gm_info->ref_buf,
gm_info->reference_frames,
gm_info->num_ref_frames);
// Sort the past and future ref frames in the ascending order of their
// distance from the current frame. reference_frames[0] => past direction
// and reference_frames[1] => future direction.
qsort(gm_info->reference_frames[0], gm_info->num_ref_frames[0],
sizeof(gm_info->reference_frames[0][0]), compare_distance);
qsort(gm_info->reference_frames[1], gm_info->num_ref_frames[1],
sizeof(gm_info->reference_frames[1][0]), compare_distance);
gm_info->num_src_corners = -1;
// If at least one valid reference frame exists in past/future directions,
// compute interest points of source frame using FAST features.
if (gm_info->num_ref_frames[0] > 0 || gm_info->num_ref_frames[1] > 0) {
gm_info->num_src_corners = av1_fast_corner_detect(
gm_info->src_buffer, source->y_width, source->y_height,
source->y_stride, gm_info->src_corners, MAX_CORNERS);
}
}
// Computes global motion w.r.t. valid reference frames.
static AOM_INLINE void global_motion_estimation(AV1_COMP *cpi) {
GlobalMotionInfo *const gm_info = &cpi->gm_info;
MotionModel params_by_motion[RANSAC_NUM_MOTIONS];
uint8_t *segment_map = NULL;
alloc_global_motion_data(params_by_motion, &segment_map,
gm_info->segment_map_w, gm_info->segment_map_h);
// Compute global motion w.r.t. past reference frames and future reference
// frames
for (int dir = 0; dir < MAX_DIRECTIONS; dir++) {
if (gm_info->num_ref_frames[dir] > 0)
compute_global_motion_for_references(
cpi, gm_info->ref_buf, gm_info->reference_frames[dir],
gm_info->num_ref_frames[dir], gm_info->num_src_corners,
gm_info->src_corners, gm_info->src_buffer, params_by_motion,
segment_map, gm_info->segment_map_w, gm_info->segment_map_h);
}
dealloc_global_motion_data(params_by_motion, segment_map);
}
// Global motion estimation for the current frame is computed.This computation
// happens once per frame and the winner motion model parameters are stored in
// cm->cur_frame->global_motion.
void av1_compute_global_motion_facade(AV1_COMP *cpi) {
AV1_COMMON *const cm = &cpi->common;
GlobalMotionInfo *const gm_info = &cpi->gm_info;
if (cpi->oxcf.tool_cfg.enable_global_motion) {
if (cpi->gf_frame_index == 0) {
for (int i = 0; i < FRAME_UPDATE_TYPES; i++) {
cpi->ppi->valid_gm_model_found[i] = INT32_MAX;
#if CONFIG_FPMT_TEST
if (cpi->ppi->fpmt_unit_test_cfg == PARALLEL_SIMULATION_ENCODE)
cpi->ppi->temp_valid_gm_model_found[i] = INT32_MAX;
#endif
}
}
}
if (cpi->common.current_frame.frame_type == INTER_FRAME && cpi->source &&
cpi->superres_mode == AOM_SUPERRES_NONE &&
cpi->oxcf.tool_cfg.enable_global_motion && !gm_info->search_done) {
setup_global_motion_info_params(cpi);
if (cpi->mt_info.num_workers > 1)
av1_global_motion_estimation_mt(cpi);
else
global_motion_estimation(cpi);
gm_info->search_done = 1;
}
memcpy(cm->cur_frame->global_motion, cm->global_motion,
sizeof(cm->cur_frame->global_motion));
}