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aomedia / avm / 6d574ab0b0225d92adff8437385d49bcf7e45f17 / . / av1 / encoder / encode_strategy.c
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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 3-Clause Clear License
* and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
* License was not distributed with this source code in the LICENSE file, you
* can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. 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
* aomedia.org/license/patent-license/.
*/
#include <stdint.h>
#include "config/aom_config.h"
#include "config/aom_scale_rtcd.h"
#include "aom/aom_codec.h"
#include "aom/aom_encoder.h"
#include "aom_ports/system_state.h"
#if CONFIG_MISMATCH_DEBUG
#include "aom_util/debug_util.h"
#endif // CONFIG_MISMATCH_DEBUG
#include "av1/common/av1_common_int.h"
#include "av1/common/reconinter.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/encode_strategy.h"
#include "av1/encoder/encodeframe.h"
#include "av1/encoder/firstpass.h"
#include "av1/encoder/pass2_strategy.h"
#include "av1/encoder/temporal_filter.h"
#include "av1/encoder/tpl_model.h"
#include "av1/encoder/encoder_utils.h"
#if CONFIG_TUNE_VMAF
#include "av1/encoder/tune_vmaf.h"
#endif
#define TEMPORAL_FILTER_KEY_FRAME 1
// Get the subgop config corresponding to the current frame within the
// gf group
const SubGOPStepCfg *get_subgop_step(const GF_GROUP *const gf_group,
int index) {
const SubGOPCfg *subgop_cfg = gf_group->subgop_cfg;
if (subgop_cfg == NULL) return NULL;
const int is_first_gop = (gf_group->update_type[0] == KF_UPDATE);
const int offset =
gf_group->has_overlay_for_key_frame ? 2 : (is_first_gop ? 1 : 0);
return &subgop_cfg->step[index - offset];
}
void av1_get_ref_frames_enc(AV1_COMMON *cm, int cur_frame_disp,
RefFrameMapPair *ref_frame_map_pairs) {
assert(cm->seq_params.explicit_ref_frame_map);
// With explicit_ref_frame_map on, an encoder-only ranking scheme can be
// implemented here. For now, av1_get_ref_frames is used as a placeholder.
av1_get_ref_frames(cm, cur_frame_disp, ref_frame_map_pairs);
}
void av1_configure_buffer_updates(AV1_COMP *const cpi,
const FRAME_UPDATE_TYPE type) {
// NOTE(weitinglin): Should we define another function to take care of
// cpi->rc.is_$Source_Type to make this function as it is in the comment?
cpi->rc.is_src_frame_alt_ref = 0;
switch (type) {
case OVERLAY_UPDATE:
case KFFLT_OVERLAY_UPDATE:
case INTNL_OVERLAY_UPDATE: cpi->rc.is_src_frame_alt_ref = 1; break;
case KF_UPDATE:
case LF_UPDATE:
case GF_UPDATE:
case ARF_UPDATE:
case KFFLT_UPDATE:
case INTNL_ARF_UPDATE: break;
default: assert(0); break;
}
}
static void set_additional_frame_flags(const AV1_COMMON *const cm,
unsigned int *const frame_flags) {
if (frame_is_intra_only(cm)) {
*frame_flags |= FRAMEFLAGS_INTRAONLY;
}
if (frame_is_sframe(cm)) {
*frame_flags |= FRAMEFLAGS_SWITCH;
}
if (cm->features.error_resilient_mode) {
*frame_flags |= FRAMEFLAGS_ERROR_RESILIENT;
}
if (cm->film_grain_params.apply_grain) {
*frame_flags |= FRAMEFLAGS_HAS_FILM_GRAIN_PARAMS;
}
}
static INLINE void update_keyframe_counters(AV1_COMP *cpi) {
if (cpi->common.show_frame) {
cpi->rc.frames_since_key++;
cpi->rc.frames_to_key--;
}
}
static INLINE int is_frame_droppable(
const ExtRefreshFrameFlagsInfo *const ext_refresh_frame_flags) {
// Droppable frame is only used by external refresh flags. VoD setting won't
// trigger its use case.
if (ext_refresh_frame_flags->update_pending)
return ext_refresh_frame_flags->all_ref_frames == 0;
else
return 0;
}
static INLINE void update_frames_till_gf_update(AV1_COMP *cpi) {
// TODO(weitinglin): Updating this counter for is_frame_droppable
// is a work-around to handle the condition when a frame is drop.
// We should fix the cpi->common.show_frame flag
// instead of checking the other condition to update the counter properly.
if (cpi->common.show_frame ||
is_frame_droppable(&cpi->ext_flags.refresh_frame)) {
// Decrement count down till next gf
if (cpi->rc.frames_till_gf_update_due > 0)
cpi->rc.frames_till_gf_update_due--;
}
}
static INLINE void update_gf_group_index(AV1_COMP *cpi) {
// Increment the gf group index ready for the next frame. If this is
// a show_existing_frame with a source other than altref, or if it is not
// a displayed forward keyframe, the index was incremented when it was
// originally encoded.
if (!cpi->common.show_existing_frame || cpi->rc.is_src_frame_alt_ref ||
cpi->common.current_frame.frame_type == KEY_FRAME) {
++cpi->gf_group.index;
}
}
// Update show_existing_frame flag for frames of type OVERLAY_UPDATE in the
// current GF interval
static INLINE void set_show_existing_alt_ref(GF_GROUP *const gf_group,
int apply_filtering,
int enable_overlay,
int show_existing_alt_ref) {
if (get_frame_update_type(gf_group) != ARF_UPDATE &&
get_frame_update_type(gf_group) != KFFLT_UPDATE)
return;
if (!enable_overlay)
gf_group->show_existing_alt_ref = 1;
else
gf_group->show_existing_alt_ref =
apply_filtering ? show_existing_alt_ref : 1;
}
static void update_rc_counts(AV1_COMP *cpi) {
update_keyframe_counters(cpi);
update_frames_till_gf_update(cpi);
update_gf_group_index(cpi);
}
static void set_ext_overrides(AV1_COMMON *const cm,
EncodeFrameParams *const frame_params,
ExternalFlags *const ext_flags) {
// Overrides the defaults with the externally supplied values with
// av1_update_reference() and av1_update_entropy() calls
// Note: The overrides are valid only for the next frame passed
// to av1_encode_lowlevel()
if (ext_flags->use_s_frame) {
frame_params->frame_type = S_FRAME;
}
if (ext_flags->refresh_frame_context_pending) {
cm->features.refresh_frame_context = ext_flags->refresh_frame_context;
ext_flags->refresh_frame_context_pending = 0;
}
cm->features.allow_ref_frame_mvs = ext_flags->use_ref_frame_mvs;
frame_params->error_resilient_mode = ext_flags->use_error_resilient;
// A keyframe is already error resilient and keyframes with
// error_resilient_mode interferes with the use of show_existing_frame
// when forward reference keyframes are enabled.
frame_params->error_resilient_mode &= frame_params->frame_type != KEY_FRAME;
// For bitstream conformance, s-frames must be error-resilient
frame_params->error_resilient_mode |= frame_params->frame_type == S_FRAME;
}
static int get_current_frame_ref_type(
const AV1_COMP *const cpi, const EncodeFrameParams *const frame_params) {
// We choose the reference "type" of this frame from the flags which indicate
// which reference frames will be refreshed by it. More than one of these
// flags may be set, so the order here implies an order of precedence. This is
// just used to choose the primary_ref_frame (as the most recent reference
// buffer of the same reference-type as the current frame)
(void)frame_params;
// TODO(jingning): This table should be a lot simpler with the new
// ARF system in place. Keep frame_params for the time being as we are
// still evaluating a few design options.
switch (cpi->gf_group.layer_depth[cpi->gf_group.index]) {
case 0: return 0;
case 1: return 1;
case MAX_ARF_LAYERS:
case MAX_ARF_LAYERS + 1: return 4;
default: return 7;
}
}
static int choose_primary_ref_frame(
const AV1_COMP *const cpi, const EncodeFrameParams *const frame_params) {
const AV1_COMMON *const cm = &cpi->common;
const int intra_only = frame_params->frame_type == KEY_FRAME ||
frame_params->frame_type == INTRA_ONLY_FRAME;
if (intra_only || frame_params->error_resilient_mode ||
cpi->ext_flags.use_primary_ref_none) {
return PRIMARY_REF_NONE;
}
// In large scale case, always use Last frame's frame contexts.
// Note(yunqing): In other cases, primary_ref_frame is chosen based on
// cpi->gf_group.layer_depth[cpi->gf_group.index], which also controls
// frame bit allocation.
if (cm->tiles.large_scale) return 0;
// Find the most recent reference frame with the same reference type as the
// current frame
const int current_ref_type = get_current_frame_ref_type(cpi, frame_params);
int wanted_fb = cpi->fb_of_context_type[current_ref_type];
int primary_ref_frame = PRIMARY_REF_NONE;
const int n_refs = cm->ref_frames_info.num_total_refs;
for (int ref_frame = 0; ref_frame < n_refs; ref_frame++) {
if (get_ref_frame_map_idx(cm, ref_frame) == wanted_fb) {
primary_ref_frame = ref_frame;
}
}
return primary_ref_frame;
}
// Map the subgop cfg reference list to actual reference buffers. Disable
// any reference frames that are not listed in the sub gop.
static void get_gop_cfg_enabled_refs(AV1_COMP *const cpi, int *ref_frame_flags,
int order_offset) {
GF_GROUP gf_group = cpi->gf_group;
// The current display index stored has not yet been updated. We must add
// The order offset to get the correct value here.
const int cur_frame_disp =
cpi->common.current_frame.frame_number + order_offset;
const SubGOPStepCfg *step_gop_cfg =
get_subgop_step(&gf_group, gf_group.index);
assert(step_gop_cfg != NULL);
// No references specified
if (step_gop_cfg->num_references < 0) return;
// Mask to indicate whether or not each ref is allowed by the GOP config
int ref_frame_used[INTER_REFS_PER_FRAME] = { 0 };
// Structures to hash each reference frame based on its pyramid level. This
// will allow us to match the pyramid levels specified in the cfg to the best
// reference frame index.
int n_references[MAX_ARF_LAYERS + 1] = { 0 };
int references[MAX_ARF_LAYERS + 1][INTER_REFS_PER_FRAME] = { { 0 } };
int disp_orders[MAX_ARF_LAYERS + 1][INTER_REFS_PER_FRAME] = { { 0 } };
int frame_level = -1;
// Loop over each reference frame and hash it based on its pyramid level
for (int frame = 0; frame < INTER_REFS_PER_FRAME; frame++) {
// Get reference frame buffer
const RefCntBuffer *const buf = get_ref_frame_buf(&cpi->common, frame);
if (buf == NULL) continue;
const int frame_order = (int)buf->display_order_hint;
frame_level = buf->pyramid_level;
// Sometimes a frame index is in multiple reference buffers.
// Do not add a frame to the pyramid list multiple times.
int found = 0;
for (int r = 0; r < n_references[frame_level]; r++) {
if (frame_order == disp_orders[frame_level][r]) {
found = 1;
break;
}
}
// If this is an unseen frame, map its display order and ref buffer
// index to its level in the pyramid
if (!found) {
int n_refs = n_references[frame_level]++;
disp_orders[frame_level][n_refs] = frame_order;
references[frame_level][n_refs] = frame;
}
}
// For each reference specified in the step_gop_cfg, map it to a reference
// buffer based on pyramid level if possible.
for (int i = 0; i < step_gop_cfg->num_references; i++) {
const int level = step_gop_cfg->references[i];
const int abs_level = abs(level);
int best_frame = -1;
int best_frame_index = -1;
int best_disp_order = INT_MAX;
for (int ref = 0; ref < n_references[abs_level]; ref++) {
const int disp_order = disp_orders[abs_level][ref];
const int cur_order_diff = cur_frame_disp - disp_order;
// This frame has already been used
if (disp_order < 0) continue;
// This frame is in the wrong direction
if ((cur_order_diff < 0) != (level < 0)) continue;
// Store this frame if it is the closest in display order to the current
// frame so far
if (abs(cur_order_diff) < abs(best_disp_order - cur_frame_disp)) {
best_frame = references[abs_level][ref];
best_frame_index = ref;
best_disp_order = disp_order;
}
}
update_subgop_ref_stats(&cpi->subgop_stats,
cpi->oxcf.unit_test_cfg.enable_subgop_stats, i,
(best_frame < 0) ? 0 : 1, level, best_disp_order,
(int)step_gop_cfg->num_references);
if (best_frame == -1) {
if (cpi->print_per_frame_stats) {
fprintf(stderr,
"Warning [Subgop cfg]: "
"Level %d ref for frame %d not found\n",
level, step_gop_cfg->disp_frame_idx);
}
} else {
ref_frame_used[best_frame] = 1;
disp_orders[abs_level][best_frame_index] = -1;
}
}
// Avoid using references that were not specified by the cfg
for (int frame = 0; frame < INTER_REFS_PER_FRAME; frame++)
if (!ref_frame_used[frame]) *ref_frame_flags &= ~(1 << (frame));
}
static void update_fb_of_context_type(
const AV1_COMP *const cpi, const EncodeFrameParams *const frame_params,
int *const fb_of_context_type) {
const AV1_COMMON *const cm = &cpi->common;
const int current_frame_ref_type =
get_current_frame_ref_type(cpi, frame_params);
const int golden_frame = cm->ref_frames_info.past_refs[0];
const int altref_frame = get_furthest_future_ref_index(cm);
if (frame_is_intra_only(cm) || cm->features.error_resilient_mode ||
cpi->ext_flags.use_primary_ref_none) {
for (int i = 0; i < REF_FRAMES; i++) {
fb_of_context_type[i] = -1;
}
fb_of_context_type[current_frame_ref_type] =
cm->show_frame ? get_ref_frame_map_idx(cm, golden_frame)
: get_ref_frame_map_idx(cm, altref_frame);
}
if (!encode_show_existing_frame(cm)) {
// Refresh fb_of_context_type[]: see encoder.h for explanation
if (cm->current_frame.frame_type == KEY_FRAME) {
// All ref frames are refreshed, pick one that will live long enough
fb_of_context_type[current_frame_ref_type] = 0;
} else {
// If more than one frame is refreshed, it doesn't matter which one we
// pick so pick the first. LST sometimes doesn't refresh any: this is ok
for (int i = 0; i < REF_FRAMES; i++) {
if (cm->current_frame.refresh_frame_flags & (1 << i)) {
fb_of_context_type[current_frame_ref_type] = i;
break;
}
}
}
}
}
static void adjust_frame_rate(AV1_COMP *cpi, int64_t ts_start, int64_t ts_end) {
TimeStamps *time_stamps = &cpi->time_stamps;
int64_t this_duration;
int step = 0;
// Clear down mmx registers
aom_clear_system_state();
if (ts_start == time_stamps->first_ever) {
this_duration = ts_end - ts_start;
step = 1;
} else {
int64_t last_duration =
time_stamps->prev_end_seen - time_stamps->prev_start_seen;
this_duration = ts_end - time_stamps->prev_end_seen;
// do a step update if the duration changes by 10%
if (last_duration)
step = (int)((this_duration - last_duration) * 10 / last_duration);
}
if (this_duration) {
if (step) {
av1_new_framerate(cpi, 10000000.0 / this_duration);
} else {
// Average this frame's rate into the last second's average
// frame rate. If we haven't seen 1 second yet, then average
// over the whole interval seen.
const double interval =
AOMMIN((double)(ts_end - time_stamps->first_ever), 10000000.0);
double avg_duration = 10000000.0 / cpi->framerate;
avg_duration *= (interval - avg_duration + this_duration);
avg_duration /= interval;
av1_new_framerate(cpi, 10000000.0 / avg_duration);
}
}
time_stamps->prev_start_seen = ts_start;
time_stamps->prev_end_seen = ts_end;
}
// Determine whether there is a forced keyframe pending in the lookahead buffer
int get_forced_keyframe_position(struct lookahead_ctx *lookahead,
const int up_to_index,
const COMPRESSOR_STAGE compressor_stage) {
/* If the forced kf is not available or if the current frame is
* forced kf, then return -1. Else return the position of the
* forced kf.
*/
for (int i = 0; i <= up_to_index; i++) {
const struct lookahead_entry *e =
av1_lookahead_peek(lookahead, i, compressor_stage);
if (e == NULL) {
// We have reached the end of the lookahead buffer and not early-returned
// so there isn't a forced key-frame pending.
return -1;
} else if (e->flags == AOM_EFLAG_FORCE_KF) {
return (i > 0) ? i : -1;
} else {
continue;
}
}
return -1; // Never reached
}
// Check if we should encode an ARF or internal ARF. If not, try a LAST
// Do some setup associated with the chosen source
// temporal_filtered, flush, and frame_update_type are outputs.
// Return the frame source, or NULL if we couldn't find one
static struct lookahead_entry *choose_frame_source(
AV1_COMP *const cpi, int *const flush, struct lookahead_entry **last_source,
EncodeFrameParams *const frame_params) {
AV1_COMMON *const cm = &cpi->common;
const GF_GROUP *const gf_group = &cpi->gf_group;
struct lookahead_entry *source = NULL;
// Source index in lookahead buffer.
int src_index = gf_group->arf_src_offset[gf_group->index];
// TODO(Aasaipriya): Forced key frames need to be fixed when rc_mode != AOM_Q
if (src_index &&
(get_forced_keyframe_position(cpi->lookahead, src_index,
cpi->compressor_stage) != -1) &&
cpi->oxcf.rc_cfg.mode != AOM_Q) {
src_index = 0;
*flush = 1;
}
// If the current frame is arf, then we should not pop from the lookahead
// buffer. If the current frame is not arf, then pop it. This assumes the
// first frame in the GF group is not arf. May need to change if it is not
// true.
int pop_lookahead = (src_index == 0);
// If this is a key frame and keyframe filtering is enabled with overlay,
// then do not pop.
if (pop_lookahead && cpi->oxcf.kf_cfg.enable_keyframe_filtering > 1 &&
cpi->rc.frames_to_key == 0 && cpi->rc.frames_till_gf_update_due == 0 &&
!is_stat_generation_stage(cpi) && cpi->lookahead) {
if (cpi->lookahead->read_ctxs[cpi->compressor_stage].sz &&
(*flush ||
cpi->lookahead->read_ctxs[cpi->compressor_stage].sz ==
cpi->lookahead->read_ctxs[cpi->compressor_stage].pop_sz)) {
pop_lookahead = 0;
}
}
frame_params->show_frame = pop_lookahead;
if (pop_lookahead) {
// show frame, pop from buffer
// Get last frame source.
if (cm->current_frame.frame_number > 0) {
*last_source =
av1_lookahead_peek(cpi->lookahead, -1, cpi->compressor_stage);
}
// Read in the source frame.
source = av1_lookahead_pop(cpi->lookahead, *flush, cpi->compressor_stage);
} else {
// no show frames are arf frames
source =
av1_lookahead_peek(cpi->lookahead, src_index, cpi->compressor_stage);
if (source != NULL) {
cm->showable_frame = 1;
}
}
return source;
}
// Don't allow a show_existing_frame to coincide with an error resilient or
// S-Frame. An exception can be made in the case of a keyframe, since it does
// not depend on any previous frames.
static int allow_show_existing(const AV1_COMP *const cpi,
unsigned int frame_flags) {
if (cpi->common.current_frame.frame_number == 0) return 0;
const struct lookahead_entry *lookahead_src =
av1_lookahead_peek(cpi->lookahead, 0, cpi->compressor_stage);
if (lookahead_src == NULL) return 1;
const int is_error_resilient =
cpi->oxcf.tool_cfg.error_resilient_mode ||
(lookahead_src->flags & AOM_EFLAG_ERROR_RESILIENT);
const int is_s_frame = cpi->oxcf.kf_cfg.enable_sframe ||
(lookahead_src->flags & AOM_EFLAG_SET_S_FRAME);
const int is_key_frame =
(cpi->rc.frames_to_key == 0) || (frame_flags & FRAMEFLAGS_KEY);
return !(is_error_resilient || is_s_frame) || is_key_frame;
}
// Update frame_flags to tell the encoder's caller what sort of frame was
// encoded.
static void update_frame_flags(const AV1_COMMON *const cm,
unsigned int *frame_flags) {
if (encode_show_existing_frame(cm)) {
*frame_flags &= ~FRAMEFLAGS_KEY;
return;
}
if (cm->current_frame.frame_type == KEY_FRAME) {
*frame_flags |= FRAMEFLAGS_KEY;
} else {
*frame_flags &= ~FRAMEFLAGS_KEY;
}
}
#define DUMP_REF_FRAME_IMAGES 0
#if DUMP_REF_FRAME_IMAGES == 1
static int dump_one_image(AV1_COMMON *cm,
const YV12_BUFFER_CONFIG *const ref_buf,
char *file_name) {
int h;
FILE *f_ref = NULL;
if (ref_buf == NULL) {
printf("Frame data buffer is NULL.\n");
return AOM_CODEC_MEM_ERROR;
}
if ((f_ref = fopen(file_name, "wb")) == NULL) {
printf("Unable to open file %s to write.\n", file_name);
return AOM_CODEC_MEM_ERROR;
}
// --- Y ---
for (h = 0; h < cm->height; ++h) {
fwrite(&ref_buf->y_buffer[h * ref_buf->y_stride], 1, cm->width, f_ref);
}
// --- U ---
for (h = 0; h < (cm->height >> 1); ++h) {
fwrite(&ref_buf->u_buffer[h * ref_buf->uv_stride], 1, (cm->width >> 1),
f_ref);
}
// --- V ---
for (h = 0; h < (cm->height >> 1); ++h) {
fwrite(&ref_buf->v_buffer[h * ref_buf->uv_stride], 1, (cm->width >> 1),
f_ref);
}
fclose(f_ref);
return AOM_CODEC_OK;
}
static void dump_ref_frame_images(AV1_COMP *cpi) {
AV1_COMMON *const cm = &cpi->common;
MV_REFERENCE_FRAME ref_frame;
for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
char file_name[256] = "";
snprintf(file_name, sizeof(file_name), "/tmp/enc_F%d_ref_%d.yuv",
cm->current_frame.frame_number, ref_frame);
dump_one_image(cm, get_ref_frame_yv12_buf(cpi, ref_frame), file_name);
}
}
#endif // DUMP_REF_FRAME_IMAGES == 1
int av1_get_refresh_ref_frame_map(int refresh_frame_flags) {
int ref_map_index = INVALID_IDX;
for (ref_map_index = 0; ref_map_index < REF_FRAMES; ++ref_map_index)
if ((refresh_frame_flags >> ref_map_index) & 1) break;
return ref_map_index;
}
int use_subgop_cfg(const GF_GROUP *const gf_group, int gf_index) {
if (gf_index < 0) return 0;
if (gf_group->subgop_cfg == NULL) return 0;
if (gf_index == 1) return !gf_group->has_overlay_for_key_frame;
return 1;
}
static int get_free_ref_map_index(RefFrameMapPair ref_map_pairs[REF_FRAMES]) {
for (int idx = 0; idx < REF_FRAMES; ++idx)
if (ref_map_pairs[idx].disp_order == -1) return idx;
return INVALID_IDX;
}
static int get_refresh_idx(int update_arf, int refresh_level,
int cur_frame_disp,
RefFrameMapPair ref_frame_map_pairs[REF_FRAMES]) {
int arf_count = 0;
int oldest_arf_order = INT32_MAX;
int oldest_arf_idx = -1;
int oldest_frame_order = INT32_MAX;
int oldest_idx = -1;
int oldest_ref_level_order = INT32_MAX;
int oldest_ref_level_idx = -1;
for (int map_idx = 0; map_idx < REF_FRAMES; map_idx++) {
RefFrameMapPair ref_pair = ref_frame_map_pairs[map_idx];
if (ref_pair.disp_order == -1) continue;
const int frame_order = ref_pair.disp_order;
const int reference_frame_level = ref_pair.pyr_level;
// Keep future frames and three closest previous frames in output order
if (frame_order > cur_frame_disp - 3) continue;
// Keep track of the oldest reference frame matching the specified
// refresh level from the subgop cfg
if (refresh_level > 0 && refresh_level == reference_frame_level) {
if (frame_order < oldest_ref_level_order) {
oldest_ref_level_order = frame_order;
oldest_ref_level_idx = map_idx;
}
}
// Keep track of the oldest level 1 frame if the current frame is level also
// 1
if (reference_frame_level == 1) {
// If there are more than 2 level 1 frames in the reference list,
// discard the oldest
if (frame_order < oldest_arf_order) {
oldest_arf_order = frame_order;
oldest_arf_idx = map_idx;
}
arf_count++;
continue;
}
// Update the overall oldest reference frame
if (frame_order < oldest_frame_order) {
oldest_frame_order = frame_order;
oldest_idx = map_idx;
}
}
if (oldest_ref_level_idx > -1) return oldest_ref_level_idx;
if (update_arf && arf_count > 2) return oldest_arf_idx;
if (oldest_idx >= 0) return oldest_idx;
if (oldest_arf_idx >= 0) return oldest_arf_idx;
assert(0 && "No valid refresh index found");
return -1;
}
static int get_refresh_frame_flags_subgop_cfg(
const AV1_COMP *const cpi, int gf_index, int cur_disp_order,
RefFrameMapPair ref_frame_map_pairs[REF_FRAMES], int refresh_mask,
int free_fb_index) {
const SubGOPStepCfg *step_gop_cfg = get_subgop_step(&cpi->gf_group, gf_index);
assert(step_gop_cfg != NULL);
const int pyr_level = step_gop_cfg->pyr_level;
const FRAME_TYPE_CODE type_code = step_gop_cfg->type_code;
const int refresh_level = step_gop_cfg->refresh;
if (refresh_level == 0) return 0;
// No refresh necessary for these frame types
if (type_code == FRAME_TYPE_INO_REPEAT ||
type_code == FRAME_TYPE_INO_SHOWEXISTING)
return refresh_mask;
// If there is an open slot, refresh that one instead of replacing a reference
if (free_fb_index != INVALID_IDX) {
refresh_mask = 1 << free_fb_index;
return refresh_mask;
}
const int update_arf = type_code == FRAME_TYPE_OOO_FILTERED && pyr_level == 1;
const int refresh_idx = get_refresh_idx(update_arf, refresh_level,
cur_disp_order, ref_frame_map_pairs);
return 1 << refresh_idx;
}
int av1_get_refresh_frame_flags(
const AV1_COMP *const cpi, const EncodeFrameParams *const frame_params,
FRAME_UPDATE_TYPE frame_update_type, int gf_index, int cur_disp_order,
RefFrameMapPair ref_frame_map_pairs[REF_FRAMES]) {
// Switch frames and shown key-frames overwrite all reference slots
if ((frame_params->frame_type == KEY_FRAME && !cpi->no_show_fwd_kf) ||
frame_params->frame_type == S_FRAME)
return 0xFF;
// show_existing_frames don't actually send refresh_frame_flags so set the
// flags to 0 to keep things consistent.
if (frame_params->show_existing_frame &&
(!frame_params->error_resilient_mode ||
frame_params->frame_type == KEY_FRAME)) {
return 0;
}
int refresh_mask = 0;
const ExtRefreshFrameFlagsInfo *const ext_refresh_frame_flags =
&cpi->ext_flags.refresh_frame;
if (is_frame_droppable(ext_refresh_frame_flags)) return 0;
if (ext_refresh_frame_flags->update_pending) {
return refresh_mask;
}
// Search for the open slot to store the current frame.
int free_fb_index = get_free_ref_map_index(ref_frame_map_pairs);
if (use_subgop_cfg(&cpi->gf_group, gf_index)) {
return get_refresh_frame_flags_subgop_cfg(cpi, gf_index, cur_disp_order,
ref_frame_map_pairs, refresh_mask,
free_fb_index);
}
// No refresh necessary for these frame types
if (frame_update_type == OVERLAY_UPDATE ||
frame_update_type == KFFLT_OVERLAY_UPDATE ||
frame_update_type == INTNL_OVERLAY_UPDATE)
return refresh_mask;
// If there is an open slot, refresh that one instead of replacing a reference
if (free_fb_index != INVALID_IDX) {
refresh_mask = 1 << free_fb_index;
return refresh_mask;
}
const int update_arf = frame_update_type == ARF_UPDATE;
const int refresh_idx =
get_refresh_idx(update_arf, -1, cur_disp_order, ref_frame_map_pairs);
return 1 << refresh_idx;
}
void setup_mi(AV1_COMP *const cpi, YV12_BUFFER_CONFIG *src) {
AV1_COMMON *const cm = &cpi->common;
const int num_planes = av1_num_planes(cm);
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
av1_setup_src_planes(x, src, 0, 0, num_planes, NULL);
av1_setup_block_planes(xd, cm->seq_params.subsampling_x,
cm->seq_params.subsampling_y, num_planes);
set_mi_offsets(&cm->mi_params, xd, 0, 0
#if CONFIG_C071_SUBBLK_WARPMV
,
0, 0
#endif // CONFIG_C071_SUBBLK_WARPMV
);
}
// Apply temporal filtering to source frames and encode the filtered frame.
// If the current frame does not require filtering, this function is identical
// to av1_encode() except that tpl is not performed.
static int denoise_and_encode(AV1_COMP *const cpi, uint8_t *const dest,
EncodeFrameInput *const frame_input,
EncodeFrameParams *const frame_params,
EncodeFrameResults *const frame_results) {
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
AV1_COMMON *const cm = &cpi->common;
const GF_GROUP *const gf_group = &cpi->gf_group;
// Decide whether to apply temporal filtering to the source frame.
int apply_filtering = 0;
int arf_src_index = -1;
if (frame_params->frame_type == KEY_FRAME) {
// Decide whether it is allowed to perform key frame filtering
int allow_kf_filtering =
oxcf->kf_cfg.enable_keyframe_filtering &&
!is_stat_generation_stage(cpi) && !frame_params->show_existing_frame &&
cpi->rc.frames_to_key > cpi->oxcf.algo_cfg.arnr_max_frames &&
!is_lossless_requested(&oxcf->rc_cfg) &&
oxcf->algo_cfg.arnr_max_frames > 0;
if (allow_kf_filtering) {
const double y_noise_level = av1_estimate_noise_from_single_plane(
frame_input->source, 0, cm->seq_params.bit_depth);
apply_filtering = y_noise_level > 0;
} else {
apply_filtering = 0;
}
// If we are doing kf filtering, set up a few things.
if (apply_filtering) {
MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
av1_init_mi_buffers(&cm->mi_params);
setup_mi(cpi, frame_input->source);
av1_init_macroblockd(cm, xd);
memset(cpi->mbmi_ext_info.frame_base, 0,
cpi->mbmi_ext_info.alloc_size *
sizeof(*cpi->mbmi_ext_info.frame_base));
av1_set_speed_features_framesize_independent(cpi, oxcf->speed);
av1_set_speed_features_framesize_dependent(cpi, oxcf->speed);
av1_set_rd_speed_thresholds(cpi);
av1_setup_frame_buf_refs(cm);
av1_setup_frame_sign_bias(cm);
av1_frame_init_quantizer(cpi);
av1_setup_past_independence(cm);
if (gf_group->update_type[gf_group->index] == KEY_FRAME &&
!cpi->no_show_fwd_kf)
cm->current_frame.frame_number = 0;
if (!frame_params->show_frame && cpi->no_show_fwd_kf) {
// fwd kf
arf_src_index = -1 * gf_group->arf_src_offset[gf_group->index];
} else if (!frame_params->show_frame) {
arf_src_index = 0;
} else {
arf_src_index = -1;
}
}
} else if (get_frame_update_type(&cpi->gf_group) == ARF_UPDATE ||
get_frame_update_type(&cpi->gf_group) == KFFLT_UPDATE ||
get_frame_update_type(&cpi->gf_group) == INTNL_ARF_UPDATE) {
// ARF
apply_filtering = oxcf->algo_cfg.arnr_max_frames > 0;
if (gf_group->is_user_specified) {
apply_filtering &= gf_group->is_filtered[gf_group->index];
}
if (apply_filtering) {
arf_src_index = gf_group->arf_src_offset[gf_group->index];
}
}
// Save the pointer to the original source image.
YV12_BUFFER_CONFIG *source_buffer = frame_input->source;
// apply filtering to frame
int show_existing_alt_ref = 0;
if (apply_filtering) {
// TODO(bohanli): figure out why we need frame_type in cm here.
cm->current_frame.frame_type = frame_params->frame_type;
const int code_arf =
av1_temporal_filter(cpi, arf_src_index, &show_existing_alt_ref);
if (code_arf) {
aom_extend_frame_borders(&cpi->alt_ref_buffer, av1_num_planes(cm));
frame_input->source = &cpi->alt_ref_buffer;
aom_copy_metadata_to_frame_buffer(frame_input->source,
source_buffer->metadata);
}
}
set_show_existing_alt_ref(&cpi->gf_group, apply_filtering,
oxcf->algo_cfg.enable_overlay,
show_existing_alt_ref);
// perform tpl after filtering
int allow_tpl = oxcf->gf_cfg.lag_in_frames > 1 &&
!is_stat_generation_stage(cpi) &&
oxcf->algo_cfg.enable_tpl_model;
if (frame_params->frame_type == KEY_FRAME) {
// Don't do tpl for fwd key frames
allow_tpl = allow_tpl && !cpi->sf.tpl_sf.disable_filtered_key_tpl &&
!cpi->no_show_fwd_kf;
} else {
// Do tpl after ARF is filtered, or if no ARF, at the second frame of GF
// group.
// TODO(bohanli): if no ARF, just do it at the first frame.
int gf_index = gf_group->index;
allow_tpl = allow_tpl && (gf_group->update_type[gf_index] == ARF_UPDATE ||
gf_group->update_type[gf_index] == GF_UPDATE);
if (allow_tpl) {
// Need to set the size for TPL for ARF
// TODO(bohanli): Why is this? what part of it is necessary?
av1_set_frame_size(cpi, cm->width, cm->height);
}
}
if (gf_group->index == 0) av1_init_tpl_stats(&cpi->tpl_data);
if (allow_tpl) av1_tpl_setup_stats(cpi, 0, frame_params, frame_input);
if (av1_encode(cpi, dest, frame_input, frame_params, frame_results) !=
AOM_CODEC_OK) {
return AOM_CODEC_ERROR;
}
// Set frame_input source to true source for psnr calculation.
if (apply_filtering && is_psnr_calc_enabled(cpi)) {
cpi->source =
av1_scale_if_required(cm, source_buffer, &cpi->scaled_source,
cm->features.interp_filter, 0, false, true);
cpi->unscaled_source = source_buffer;
}
return AOM_CODEC_OK;
}
int av1_encode_strategy(AV1_COMP *const cpi, size_t *const size,
uint8_t *const dest, unsigned int *frame_flags,
int64_t *const time_stamp, int64_t *const time_end,
const aom_rational64_t *const timestamp_ratio,
int flush) {
AV1EncoderConfig *const oxcf = &cpi->oxcf;
AV1_COMMON *const cm = &cpi->common;
GF_GROUP *gf_group = &cpi->gf_group;
ExternalFlags *const ext_flags = &cpi->ext_flags;
EncodeFrameInput frame_input;
EncodeFrameParams frame_params;
EncodeFrameResults frame_results;
memset(&frame_input, 0, sizeof(frame_input));
memset(&frame_params, 0, sizeof(frame_params));
memset(&frame_results, 0, sizeof(frame_results));
// Check if we need to stuff more src frames
if (flush == 0) {
int srcbuf_size =
av1_lookahead_depth(cpi->lookahead, cpi->compressor_stage);
int pop_size = av1_lookahead_pop_sz(cpi->lookahead, cpi->compressor_stage);
// Continue buffering look ahead buffer.
if (srcbuf_size < pop_size) return -1;
}
if (!av1_lookahead_peek(cpi->lookahead, 0, cpi->compressor_stage)) {
if (flush && oxcf->pass == 1 && !cpi->twopass.first_pass_done) {
av1_end_first_pass(cpi); /* get last stats packet */
cpi->twopass.first_pass_done = 1;
}
return -1;
}
if (!is_stat_generation_stage(cpi)) {
// If this is a forward keyframe, mark as a show_existing_frame
// TODO(bohanli): find a consistent condition for fwd keyframes
if (oxcf->kf_cfg.fwd_kf_enabled &&
(gf_group->index == (gf_group->size - 1)) &&
(gf_group->update_type[gf_group->index] == OVERLAY_UPDATE ||
gf_group->update_type[gf_group->index] == KFFLT_OVERLAY_UPDATE) &&
gf_group->arf_index >= 0 && cpi->rc.frames_to_key == 0) {
frame_params.show_existing_frame = 1;
} else {
frame_params.show_existing_frame =
(gf_group->show_existing_alt_ref &&
(gf_group->update_type[gf_group->index] == OVERLAY_UPDATE ||
gf_group->update_type[gf_group->index] == KFFLT_OVERLAY_UPDATE)) ||
gf_group->update_type[gf_group->index] == INTNL_OVERLAY_UPDATE;
}
frame_params.show_existing_frame &= allow_show_existing(cpi, *frame_flags);
// Reset show_existing_alt_ref decision to 0 after it is used.
if (gf_group->update_type[gf_group->index] == OVERLAY_UPDATE ||
gf_group->update_type[gf_group->index] == KFFLT_OVERLAY_UPDATE) {
gf_group->show_existing_alt_ref = 0;
}
} else {
frame_params.show_existing_frame = 0;
}
if (!is_stat_generation_stage(cpi)) {
av1_get_second_pass_params(cpi, &frame_params);
}
struct lookahead_entry *source = NULL;
struct lookahead_entry *last_source = NULL;
if (frame_params.show_existing_frame) {
source = av1_lookahead_pop(cpi->lookahead, flush, cpi->compressor_stage);
frame_params.show_frame = 1;
} else {
source = choose_frame_source(cpi, &flush, &last_source, &frame_params);
}
if (source == NULL) { // If no source was found, we can't encode a frame.
if (flush && oxcf->pass == 1 && !cpi->twopass.first_pass_done) {
av1_end_first_pass(cpi); /* get last stats packet */
cpi->twopass.first_pass_done = 1;
}
return -1;
}
// Source may be changed if temporal filtered later.
frame_input.source = &source->img;
frame_input.last_source = last_source != NULL ? &last_source->img : NULL;
frame_input.ts_duration = source->ts_end - source->ts_start;
// Save unfiltered source. It is used in av1_get_second_pass_params().
cpi->unfiltered_source = frame_input.source;
*time_stamp = source->ts_start;
*time_end = source->ts_end;
if (source->ts_start < cpi->time_stamps.first_ever) {
cpi->time_stamps.first_ever = source->ts_start;
cpi->time_stamps.prev_end_seen = source->ts_start;
}
av1_apply_encoding_flags(cpi, source->flags);
if (!frame_params.show_existing_frame)
*frame_flags = (source->flags & AOM_EFLAG_FORCE_KF) ? FRAMEFLAGS_KEY : 0;
// Shown frames and arf-overlay frames need frame-rate considering
if (frame_params.show_frame)
adjust_frame_rate(cpi, source->ts_start, source->ts_end);
if (!frame_params.show_existing_frame) {
if (cpi->film_grain_table) {
cm->cur_frame->film_grain_params_present = aom_film_grain_table_lookup(
cpi->film_grain_table, *time_stamp, *time_end, 0 /* =erase */,
&cm->film_grain_params);
} else {
cm->cur_frame->film_grain_params_present =
cm->seq_params.film_grain_params_present;
}
// only one operating point supported now
const int64_t pts64 = ticks_to_timebase_units(timestamp_ratio, *time_stamp);
if (pts64 < 0 || pts64 > UINT32_MAX) return AOM_CODEC_ERROR;
cm->frame_presentation_time = (uint32_t)pts64;
}
FRAME_UPDATE_TYPE frame_update_type = get_frame_update_type(gf_group);
if (frame_params.show_existing_frame &&
frame_params.frame_type != KEY_FRAME) {
// Force show-existing frames to be INTER, except forward keyframes
frame_params.frame_type = INTER_FRAME;
}
// TODO(david.turner@argondesign.com): Move all the encode strategy
// (largely near av1_get_compressed_data) in here
// TODO(david.turner@argondesign.com): Change all the encode strategy to
// modify frame_params instead of cm or cpi.
// Per-frame encode speed. In theory this can vary, but things may have
// been written assuming speed-level will not change within a sequence, so
// this parameter should be used with caution.
frame_params.speed = oxcf->speed;
// Work out some encoding parameters specific to the pass:
if (has_no_stats_stage(cpi) && oxcf->q_cfg.aq_mode == CYCLIC_REFRESH_AQ) {
av1_cyclic_refresh_update_parameters(cpi);
} else if (is_stat_generation_stage(cpi)) {
cpi->td.mb.e_mbd.lossless[0] = is_lossless_requested(&oxcf->rc_cfg);
const int kf_requested = (cm->current_frame.frame_number == 0 ||
(*frame_flags & FRAMEFLAGS_KEY));
if (kf_requested && frame_update_type != OVERLAY_UPDATE &&
frame_update_type != KFFLT_OVERLAY_UPDATE &&
frame_update_type != INTNL_OVERLAY_UPDATE) {
frame_params.frame_type = KEY_FRAME;
} else {
frame_params.frame_type = INTER_FRAME;
}
} else if (is_stat_consumption_stage(cpi)) {
#if CONFIG_MISMATCH_DEBUG
mismatch_move_frame_idx_w();
#endif
#if TXCOEFF_COST_TIMER
cm->txcoeff_cost_timer = 0;
cm->txcoeff_cost_count = 0;
#endif
}
#if CONFIG_MISMATCH_DEBUG
if (has_no_stats_stage(cpi)) mismatch_move_frame_idx_w();
#endif // CONFIG_MISMATCH_DEBUG
if (!is_stat_generation_stage(cpi))
set_ext_overrides(cm, &frame_params, ext_flags);
// Shown keyframes and S frames refresh all reference buffers
const int force_refresh_all =
((frame_params.frame_type == KEY_FRAME && frame_params.show_frame) ||
frame_params.frame_type == S_FRAME) &&
!frame_params.show_existing_frame;
(void)force_refresh_all;
av1_configure_buffer_updates(cpi, frame_update_type);
const int order_offset = gf_group->arf_src_offset[gf_group->index];
const int cur_frame_disp =
cpi->common.current_frame.frame_number + order_offset;
RefFrameMapPair ref_frame_map_pairs[REF_FRAMES];
init_ref_map_pair(&cpi->common, ref_frame_map_pairs,
gf_group->update_type[gf_group->index] == KF_UPDATE);
if (!is_stat_generation_stage(cpi)) {
cm->current_frame.frame_type = frame_params.frame_type;
cm->features.error_resilient_mode = frame_params.error_resilient_mode;
if (cm->seq_params.explicit_ref_frame_map)
av1_get_ref_frames_enc(cm, cur_frame_disp, ref_frame_map_pairs);
else
av1_get_ref_frames(cm, cur_frame_disp, ref_frame_map_pairs);
#if CONFIG_ALLOW_SAME_REF_COMPOUND
cm->ref_frames_info.num_same_ref_compound =
AOMMIN(cm->seq_params.num_same_ref_compound,
cm->ref_frames_info.num_total_refs);
#endif // CONFIG_ALLOW_SAME_REF_COMPOUND
// ref_frame_flags is defined based on the external flag
// max-reference-frames.
frame_params.ref_frame_flags =
(1 << cpi->common.ref_frames_info.num_total_refs) - 1;
frame_params.primary_ref_frame =
choose_primary_ref_frame(cpi, &frame_params);
frame_params.order_offset = gf_group->arf_src_offset[gf_group->index];
if (!is_stat_generation_stage(cpi) &&
use_subgop_cfg(&cpi->gf_group, cpi->gf_group.index) &&
frame_update_type != KF_UPDATE) {
get_gop_cfg_enabled_refs(cpi, &frame_params.ref_frame_flags,
frame_params.order_offset);
}
frame_params.refresh_frame_flags = av1_get_refresh_frame_flags(
cpi, &frame_params, frame_update_type, cpi->gf_group.index,
cur_frame_disp, ref_frame_map_pairs);
frame_params.existing_fb_idx_to_show = INVALID_IDX;
// Find the frame buffer to show based on display order
if (frame_params.show_existing_frame) {
for (int frame = 0; frame < REF_FRAMES; frame++) {
const RefCntBuffer *const buf = cm->ref_frame_map[frame];
if (buf == NULL) continue;
const int frame_order = (int)buf->display_order_hint;
if (frame_order == cur_frame_disp)
frame_params.existing_fb_idx_to_show = frame;
}
}
}
// The way frame_params->remapped_ref_idx is setup is a placeholder.
// Currently, reference buffer assignment is done by update_ref_frame_map()
// which is called by high-level strategy AFTER encoding a frame. It
// modifies cm->remapped_ref_idx. If you want to use an alternative method
// to determine reference buffer assignment, just put your assignments into
// frame_params->remapped_ref_idx here and they will be used when encoding
// this frame. If frame_params->remapped_ref_idx is setup independently of
// cm->remapped_ref_idx then update_ref_frame_map() will have no effect.
memcpy(frame_params.remapped_ref_idx, cm->remapped_ref_idx,
REF_FRAMES * sizeof(*cm->remapped_ref_idx));
cpi->td.mb.delta_qindex = 0;
if (!frame_params.show_existing_frame) {
cm->quant_params.using_qmatrix = oxcf->q_cfg.using_qm;
#if CONFIG_LR_FLEX_SYNTAX
av1_set_lr_tools(cm->seq_params.lr_tools_disable_mask[0], 0, &cm->features);
av1_set_lr_tools(cm->seq_params.lr_tools_disable_mask[1], 1, &cm->features);
av1_set_lr_tools(cm->seq_params.lr_tools_disable_mask[1], 2, &cm->features);
#endif // CONFIG_LR_FLEX_SYNTAX
}
if (denoise_and_encode(cpi, dest, &frame_input, &frame_params,
&frame_results) != AOM_CODEC_OK) {
return AOM_CODEC_ERROR;
}
if (!is_stat_generation_stage(cpi)) {
// First pass doesn't modify reference buffer assignment or produce frame
// flags
update_frame_flags(&cpi->common, frame_flags);
}
if (!is_stat_generation_stage(cpi)) {
#if TXCOEFF_COST_TIMER
cm->cum_txcoeff_cost_timer += cm->txcoeff_cost_timer;
fprintf(stderr,
"\ntxb coeff cost block number: %ld, frame time: %ld, cum time %ld "
"in us\n",
cm->txcoeff_cost_count, cm->txcoeff_cost_timer,
cm->cum_txcoeff_cost_timer);
#endif
if (!has_no_stats_stage(cpi)) av1_twopass_postencode_update(cpi);
}
#if CONFIG_TUNE_VMAF
if (!is_stat_generation_stage(cpi) &&
(oxcf->tune_cfg.tuning >= AOM_TUNE_VMAF_WITH_PREPROCESSING &&
oxcf->tune_cfg.tuning <= AOM_TUNE_VMAF_NEG_MAX_GAIN)) {
av1_update_vmaf_curve(cpi);
}
#endif
if (!is_stat_generation_stage(cpi)) {
update_fb_of_context_type(cpi, &frame_params, cpi->fb_of_context_type);
set_additional_frame_flags(cm, frame_flags);
update_rc_counts(cpi);
}
// Unpack frame_results:
*size = frame_results.size;
// Leave a signal for a higher level caller about if this frame is droppable
if (*size > 0) {
cpi->droppable = is_frame_droppable(&ext_flags->refresh_frame);
}
return AOM_CODEC_OK;
}
// Determine whether a frame is a keyframe arf. Will return 0 for fwd kf arf.
// Note it depends on frame_since_key and gf_group, therefore should be called
// after the gf group is defined, or otherwise a keyframe arf may still return
// 0.
int av1_check_keyframe_arf(int gf_index, GF_GROUP *gf_group,
int frame_since_key) {
if (gf_index >= gf_group->size) return 0;
(void)frame_since_key;
return gf_group->update_type[gf_index] == KFFLT_UPDATE;
/*
return gf_group->update_type[gf_index] == ARF_UPDATE &&
gf_group->update_type[gf_index + 1] == OVERLAY_UPDATE &&
frame_since_key == 0;
*/
}
// Determine whether a frame is a keyframe overlay (will also return 0 for fwd
// kf overlays).
int av1_check_keyframe_overlay(int gf_index, GF_GROUP *gf_group,
int frame_since_key) {
if (gf_index < 1) return 0;
(void)frame_since_key;
return gf_group->update_type[gf_index] == KFFLT_OVERLAY_UPDATE;
/*
return gf_group->update_type[gf_index - 1] == ARF_UPDATE &&
gf_group->update_type[gf_index] == OVERLAY_UPDATE &&
frame_since_key == 0;
*/
}