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aomedia / aom / 2d0919f2af09ff0f27c349082a241cf8d1b1fff7 / . / av1 / encoder / encode_strategy.c
blob: ef65394d2ad36926d4464ae5e77b7f6f4a60a730 [file] [log] [blame]
/*
* Copyright (c) 2019, 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 <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/onyxc_int.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/encode_strategy.h"
#include "av1/encoder/firstpass.h"
#include "av1/encoder/pass2_strategy.h"
#include "av1/encoder/temporal_filter.h"
#include "av1/encoder/tpl_model.h"
void av1_configure_buffer_updates(AV1_COMP *const cpi,
EncodeFrameParams *const frame_params,
const FRAME_UPDATE_TYPE type,
int force_refresh_all) {
// 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;
cpi->rc.is_src_frame_internal_arf = 0;
switch (type) {
case KF_UPDATE:
frame_params->refresh_last_frame = 1;
frame_params->refresh_golden_frame = 1;
frame_params->refresh_bwd_ref_frame = 1;
frame_params->refresh_alt2_ref_frame = 1;
frame_params->refresh_alt_ref_frame = 1;
break;
case LF_UPDATE:
frame_params->refresh_last_frame = 1;
frame_params->refresh_golden_frame = 0;
frame_params->refresh_bwd_ref_frame = 0;
frame_params->refresh_alt2_ref_frame = 0;
frame_params->refresh_alt_ref_frame = 0;
break;
case GF_UPDATE:
// TODO(zoeliu): To further investigate whether 'refresh_last_frame' is
// needed.
frame_params->refresh_last_frame = 1;
frame_params->refresh_golden_frame = 1;
frame_params->refresh_bwd_ref_frame = 0;
frame_params->refresh_alt2_ref_frame = 0;
frame_params->refresh_alt_ref_frame = 0;
break;
case OVERLAY_UPDATE:
frame_params->refresh_last_frame = 0;
frame_params->refresh_golden_frame = 1;
frame_params->refresh_bwd_ref_frame = 0;
frame_params->refresh_alt2_ref_frame = 0;
frame_params->refresh_alt_ref_frame = 0;
cpi->rc.is_src_frame_alt_ref = 1;
break;
case ARF_UPDATE:
frame_params->refresh_last_frame = 0;
frame_params->refresh_golden_frame = 0;
// NOTE: BWDREF does not get updated along with ALTREF_FRAME.
frame_params->refresh_bwd_ref_frame = 0;
frame_params->refresh_alt2_ref_frame = 0;
frame_params->refresh_alt_ref_frame = 1;
break;
case INTNL_OVERLAY_UPDATE:
frame_params->refresh_last_frame = 1;
frame_params->refresh_golden_frame = 0;
frame_params->refresh_bwd_ref_frame = 0;
frame_params->refresh_alt2_ref_frame = 0;
frame_params->refresh_alt_ref_frame = 0;
cpi->rc.is_src_frame_alt_ref = 1;
cpi->rc.is_src_frame_internal_arf = 1;
break;
case INTNL_ARF_UPDATE:
frame_params->refresh_last_frame = 0;
frame_params->refresh_golden_frame = 0;
if (cpi->oxcf.pass == 2) {
frame_params->refresh_bwd_ref_frame = 1;
frame_params->refresh_alt2_ref_frame = 0;
} else {
frame_params->refresh_bwd_ref_frame = 0;
frame_params->refresh_alt2_ref_frame = 1;
}
frame_params->refresh_alt_ref_frame = 0;
break;
default: assert(0); break;
}
if (cpi->ext_refresh_frame_flags_pending &&
(cpi->oxcf.pass == 0 || cpi->oxcf.pass == 2)) {
frame_params->refresh_last_frame = cpi->ext_refresh_last_frame;
frame_params->refresh_golden_frame = cpi->ext_refresh_golden_frame;
frame_params->refresh_alt_ref_frame = cpi->ext_refresh_alt_ref_frame;
frame_params->refresh_bwd_ref_frame = cpi->ext_refresh_bwd_ref_frame;
frame_params->refresh_alt2_ref_frame = cpi->ext_refresh_alt2_ref_frame;
}
if (force_refresh_all) {
frame_params->refresh_last_frame = 1;
frame_params->refresh_golden_frame = 1;
frame_params->refresh_bwd_ref_frame = 1;
frame_params->refresh_alt2_ref_frame = 1;
frame_params->refresh_alt_ref_frame = 1;
}
}
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->error_resilient_mode) *frame_flags |= FRAMEFLAGS_ERROR_RESILIENT;
}
static INLINE void update_keyframe_counters(AV1_COMP *cpi) {
if (cpi->common.show_frame) {
if (!cpi->common.show_existing_frame || cpi->rc.is_src_frame_alt_ref ||
cpi->common.current_frame.frame_type == KEY_FRAME) {
// If this is a show_existing_frame with a source other than altref,
// or if it is not a displayed forward keyframe, the keyframe update
// counters were incremented when it was originally encoded.
cpi->rc.frames_since_key++;
cpi->rc.frames_to_key--;
}
}
}
static INLINE int is_frame_droppable(const AV1_COMP *const cpi) {
return !(cpi->refresh_alt_ref_frame || cpi->refresh_alt2_ref_frame ||
cpi->refresh_bwd_ref_frame || cpi->refresh_golden_frame ||
cpi->refresh_last_frame);
}
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)) {
// 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_twopass_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->twopass.gf_group.index;
}
}
static void update_rc_counts(AV1_COMP *cpi) {
update_keyframe_counters(cpi);
update_frames_till_gf_update(cpi);
if (cpi->oxcf.pass == 2) update_twopass_gf_group_index(cpi);
}
static void check_show_existing_frame(AV1_COMP *const cpi,
EncodeFrameParams *const frame_params) {
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
AV1_COMMON *const cm = &cpi->common;
const FRAME_UPDATE_TYPE frame_update_type =
gf_group->update_type[gf_group->index];
const int which_arf = (gf_group->arf_update_idx[gf_group->index] > 0);
if (cm->show_existing_frame == 1) {
frame_params->show_existing_frame = 0;
} else if (cpi->is_arf_filter_off[which_arf] &&
(frame_update_type == OVERLAY_UPDATE ||
frame_update_type == INTNL_OVERLAY_UPDATE)) {
// Other parameters related to OVERLAY_UPDATE will be taken care of
// in av1_get_second_pass_params(cpi)
frame_params->show_existing_frame = 1;
frame_params->existing_fb_idx_to_show =
(frame_update_type == OVERLAY_UPDATE)
? get_ref_frame_map_idx(cm, ALTREF_FRAME)
: get_ref_frame_map_idx(cm, BWDREF_FRAME);
}
}
static void set_ext_overrides(AV1_COMP *const cpi,
EncodeFrameParams *const frame_params) {
// 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()
AV1_COMMON *const cm = &cpi->common;
if (cpi->ext_use_s_frame) {
frame_params->frame_type = S_FRAME;
}
if (cpi->ext_refresh_frame_context_pending) {
cm->refresh_frame_context = cpi->ext_refresh_frame_context;
cpi->ext_refresh_frame_context_pending = 0;
}
cm->allow_ref_frame_mvs = cpi->ext_use_ref_frame_mvs;
frame_params->error_resilient_mode = cpi->ext_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_ref_frame_flags(const AV1_COMP *const cpi) {
const AV1_COMMON *const cm = &cpi->common;
const RefCntBuffer *last_buf = get_ref_frame_buf(cm, LAST_FRAME);
const RefCntBuffer *last2_buf = get_ref_frame_buf(cm, LAST2_FRAME);
const RefCntBuffer *last3_buf = get_ref_frame_buf(cm, LAST3_FRAME);
const RefCntBuffer *golden_buf = get_ref_frame_buf(cm, GOLDEN_FRAME);
const RefCntBuffer *bwd_buf = get_ref_frame_buf(cm, BWDREF_FRAME);
const RefCntBuffer *alt2_buf = get_ref_frame_buf(cm, ALTREF2_FRAME);
const RefCntBuffer *alt_buf = get_ref_frame_buf(cm, ALTREF_FRAME);
// No.1 Priority: LAST_FRAME
const int last2_is_last = (last2_buf == last_buf);
const int last3_is_last = (last3_buf == last_buf);
const int gld_is_last = (golden_buf == last_buf);
const int bwd_is_last = (bwd_buf == last_buf);
const int alt2_is_last = (alt2_buf == last_buf);
const int alt_is_last = (alt_buf == last_buf);
// No.2 Priority: ALTREF_FRAME
const int last2_is_alt = (last2_buf == alt_buf);
const int last3_is_alt = (last3_buf == alt_buf);
const int gld_is_alt = (golden_buf == alt_buf);
const int bwd_is_alt = (bwd_buf == alt_buf);
const int alt2_is_alt = (alt2_buf == alt_buf);
// No.3 Priority: LAST2_FRAME
const int last3_is_last2 = (last3_buf == last2_buf);
const int gld_is_last2 = (golden_buf == last2_buf);
const int bwd_is_last2 = (bwd_buf == last2_buf);
const int alt2_is_last2 = (alt2_buf == last2_buf);
// No.4 Priority: LAST3_FRAME
const int gld_is_last3 = (golden_buf == last3_buf);
const int bwd_is_last3 = (bwd_buf == last3_buf);
const int alt2_is_last3 = (alt2_buf == last3_buf);
// No.5 Priority: GOLDEN_FRAME
const int bwd_is_gld = (bwd_buf == golden_buf);
const int alt2_is_gld = (alt2_buf == golden_buf);
// No.6 Priority: BWDREF_FRAME
const int alt2_is_bwd = (alt2_buf == bwd_buf);
// No.7 Priority: ALTREF2_FRAME
// cpi->ext_ref_frame_flags allows certain reference types to be disabled
// by the external interface. These are set by av1_apply_encoding_flags().
// Start with what the external interface allows, then suppress any reference
// types which we have found to be duplicates.
int flags = cpi->ext_ref_frame_flags;
if (cpi->rc.frames_till_gf_update_due == INT_MAX) flags &= ~AOM_GOLD_FLAG;
if (alt_is_last) flags &= ~AOM_ALT_FLAG;
if (last2_is_last || last2_is_alt) flags &= ~AOM_LAST2_FLAG;
if (last3_is_last || last3_is_alt || last3_is_last2) flags &= ~AOM_LAST3_FLAG;
if (gld_is_last || gld_is_alt || gld_is_last2 || gld_is_last3)
flags &= ~AOM_GOLD_FLAG;
if ((bwd_is_last || bwd_is_alt || bwd_is_last2 || bwd_is_last3 || bwd_is_gld))
flags &= ~AOM_BWD_FLAG;
if ((alt2_is_last || alt2_is_alt || alt2_is_last2 || alt2_is_last3 ||
alt2_is_gld || alt2_is_bwd))
flags &= ~AOM_ALT2_FLAG;
return flags;
}
static int get_current_frame_ref_type(
const AV1_COMP *const cpi, const EncodeFrameParams *const frame_params) {
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
// 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)
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_use_primary_ref_none)
return REGULAR_FRAME;
else if (gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE)
return INTERNAL_ARF_FRAME;
else if (frame_params->refresh_alt_ref_frame)
return ARF_FRAME;
else if (cpi->rc.is_src_frame_alt_ref)
return OVERLAY_FRAME;
else if (frame_params->refresh_golden_frame)
return GLD_FRAME;
else if (frame_params->refresh_bwd_ref_frame)
return BRF_FRAME;
else
return REGULAR_FRAME;
}
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_use_primary_ref_none) {
return PRIMARY_REF_NONE;
}
// Find the most recent reference frame with the same reference type as the
// current frame
const FRAME_CONTEXT_INDEX 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;
for (int ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
if (get_ref_frame_map_idx(cm, ref_frame) == wanted_fb) {
primary_ref_frame = ref_frame - LAST_FRAME;
}
}
return primary_ref_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;
if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
cpi->ext_use_primary_ref_none) {
for (int i = 0; i < REF_FRAMES; i++) {
fb_of_context_type[i] = -1;
}
fb_of_context_type[REGULAR_FRAME] =
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[REGULAR_FRAME] = 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
const int current_frame_ref_type =
get_current_frame_ref_type(cpi, frame_params);
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 int get_order_offset(const GF_GROUP *const gf_group,
const EncodeFrameParams *const frame_params) {
// shown frame by definition has order offset 0
// show_existing_frame ignores order_offset and simply takes the order_hint
// from the reference frame being shown.
if (frame_params->show_frame || frame_params->show_existing_frame) return 0;
const int arf_offset =
AOMMIN((MAX_GF_INTERVAL - 1), gf_group->arf_src_offset[gf_group->index]);
return AOMMIN((MAX_GF_INTERVAL - 1), arf_offset);
}
static void adjust_frame_rate(AV1_COMP *cpi,
const struct lookahead_entry *source) {
int64_t this_duration;
int step = 0;
// Clear down mmx registers
aom_clear_system_state();
if (source->ts_start == cpi->first_time_stamp_ever) {
this_duration = source->ts_end - source->ts_start;
step = 1;
} else {
int64_t last_duration =
cpi->last_end_time_stamp_seen - cpi->last_time_stamp_seen;
this_duration = source->ts_end - cpi->last_end_time_stamp_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)(source->ts_end - cpi->first_time_stamp_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);
}
}
cpi->last_time_stamp_seen = source->ts_start;
cpi->last_end_time_stamp_seen = source->ts_end;
}
// If this is an alt-ref, returns the offset of the source frame used
// as the arf midpoint. Otherwise, returns 0.
static int get_arf_src_index(AV1_COMP *cpi) {
RATE_CONTROL *const rc = &cpi->rc;
int arf_src_index = 0;
if (cpi->oxcf.pass == 2) {
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
if (gf_group->update_type[gf_group->index] == ARF_UPDATE) {
assert(is_altref_enabled(cpi));
arf_src_index = gf_group->arf_src_offset[gf_group->index];
}
} else if (rc->source_alt_ref_pending) {
arf_src_index = rc->frames_till_gf_update_due;
}
return arf_src_index;
}
// If this is an internal alt-ref, returns the offset of the source frame used
// as the internal arf midpoint. Otherwise, returns 0.
static int get_internal_arf_src_index(AV1_COMP *cpi) {
int internal_arf_src_index = 0;
if (cpi->oxcf.pass == 2) {
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
if (gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE) {
assert(is_altref_enabled(cpi) && cpi->internal_altref_allowed);
internal_arf_src_index = gf_group->arf_src_offset[gf_group->index];
}
}
return internal_arf_src_index;
}
// Called if this frame is an ARF or ARF2. Also handles forward-keyframes
// For an ARF set arf2=0, for ARF2 set arf2=1
// temporal_filtered is set to 1 if we temporally filter the ARF frame, so that
// the correct post-filter buffer can be used.
static struct lookahead_entry *setup_arf_or_arf2(
AV1_COMP *const cpi, const int arf_src_index, const int arf2,
int *temporal_filtered, EncodeFrameParams *const frame_params) {
AV1_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
assert(arf_src_index <= rc->frames_to_key);
*temporal_filtered = 0;
struct lookahead_entry *source =
av1_lookahead_peek(cpi->lookahead, arf_src_index);
if (source != NULL) {
cm->showable_frame = 1;
cpi->alt_ref_source = source;
// When arf_src_index == rc->frames_to_key, it indicates a fwd_kf
if (!arf2 && arf_src_index == rc->frames_to_key) {
// Skip temporal filtering and mark as intra_only if we have a fwd_kf
const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
int which_arf = gf_group->arf_update_idx[gf_group->index];
cpi->is_arf_filter_off[which_arf] = 1;
cpi->no_show_kf = 1;
} else {
if (oxcf->arnr_max_frames > 0) {
// Produce the filtered ARF frame.
av1_temporal_filter(cpi, arf_src_index);
aom_extend_frame_borders(&cpi->alt_ref_buffer, av1_num_planes(cm));
*temporal_filtered = 1;
}
}
frame_params->show_frame = 0;
}
rc->source_alt_ref_pending = 0;
return source;
}
// Determine whether there is a forced keyframe pending in the lookahead buffer
static int is_forced_keyframe_pending(struct lookahead_ctx *lookahead,
const int up_to_index) {
for (int i = 0; i <= up_to_index; i++) {
const struct lookahead_entry *e = av1_lookahead_peek(lookahead, i);
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 0;
} else if (e->flags == AOM_EFLAG_FORCE_KF) {
return 1;
} else {
continue;
}
}
return 0; // 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 temporal_filtered, int *const flush,
struct lookahead_entry **last_source, FRAME_UPDATE_TYPE *frame_update_type,
EncodeFrameParams *const frame_params) {
AV1_COMMON *const cm = &cpi->common;
struct lookahead_entry *source = NULL;
*temporal_filtered = 0;
// Should we encode an alt-ref frame.
int arf_src_index = get_arf_src_index(cpi);
if (arf_src_index &&
is_forced_keyframe_pending(cpi->lookahead, arf_src_index)) {
arf_src_index = 0;
*flush = 1;
}
if (arf_src_index) {
source = setup_arf_or_arf2(cpi, arf_src_index, 0, temporal_filtered,
frame_params);
*frame_update_type = ARF_UPDATE;
}
// Should we encode an internal Alt-ref frame (mutually exclusive to ARF)
arf_src_index = get_internal_arf_src_index(cpi);
if (arf_src_index &&
is_forced_keyframe_pending(cpi->lookahead, arf_src_index)) {
arf_src_index = 0;
*flush = 1;
}
if (arf_src_index) {
source = setup_arf_or_arf2(cpi, arf_src_index, 1, temporal_filtered,
frame_params);
*frame_update_type = INTNL_ARF_UPDATE;
}
if (!source) {
// Get last frame source.
if (cm->current_frame.frame_number > 0) {
*last_source = av1_lookahead_peek(cpi->lookahead, -1);
}
// Read in the source frame.
source = av1_lookahead_pop(cpi->lookahead, *flush);
if (source == NULL) return NULL;
*frame_update_type = LF_UPDATE; // Default update type
frame_params->show_frame = 1;
// Check to see if the frame should be encoded as an arf overlay.
if (cpi->alt_ref_source == source) {
*frame_update_type = OVERLAY_UPDATE;
cpi->alt_ref_source = NULL;
}
}
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);
if (lookahead_src == NULL) return 1;
const int is_error_resilient =
cpi->oxcf.error_resilient_mode ||
(lookahead_src->flags & AOM_EFLAG_ERROR_RESILIENT);
const int is_s_frame =
cpi->oxcf.s_frame_mode || (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(AV1_COMP *cpi, unsigned int *frame_flags) {
if (encode_show_existing_frame(&cpi->common)) {
*frame_flags &= ~FRAMEFLAGS_GOLDEN;
*frame_flags &= ~FRAMEFLAGS_BWDREF;
*frame_flags &= ~FRAMEFLAGS_ALTREF;
*frame_flags &= ~FRAMEFLAGS_KEY;
return;
}
if (cpi->refresh_golden_frame == 1) {
*frame_flags |= FRAMEFLAGS_GOLDEN;
} else {
*frame_flags &= ~FRAMEFLAGS_GOLDEN;
}
if (cpi->refresh_alt_ref_frame == 1) {
*frame_flags |= FRAMEFLAGS_ALTREF;
} else {
*frame_flags &= ~FRAMEFLAGS_ALTREF;
}
if (cpi->refresh_bwd_ref_frame == 1) {
*frame_flags |= FRAMEFLAGS_BWDREF;
} else {
*frame_flags &= ~FRAMEFLAGS_BWDREF;
}
if (cpi->common.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
// Assign new_ref in the new mapping to point at the reference buffer pointed at
// by old_ref in the old_map. The new mapping is stored in *new_map, while the
// old map comes from cm->remapped_ref_idx[].
static void assign_new_map(AV1_COMMON *const cm, int *new_map, int new_ref,
int old_ref) {
new_map[new_ref - LAST_FRAME] = cm->remapped_ref_idx[old_ref - LAST_FRAME];
}
// Generate a new reference frame mapping. This function updates
// cm->remapped_ref_idx[] depending on the frame_update_type of this frame.
// This determines which references (e.g. LAST_FRAME, ALTREF_FRAME) point at the
// 8 underlying buffers and, together with get_refresh_frame_flags(), implements
// our reference frame management strategy.
static void update_ref_frame_map(AV1_COMP *cpi,
FRAME_UPDATE_TYPE frame_update_type) {
AV1_COMMON *const cm = &cpi->common;
// If check_frame_refs_short_signaling() decided to set
// frame_refs_short_signaling=1 then we update remapped_ref_idx[] here. Every
// reference will still map to the same RefCntBuffer (through ref_frame_map[])
// after this, but that does not necessarily mean that remapped_ref_idx[] is
// unchanged.
if (cm->current_frame.frame_refs_short_signaling) {
const int lst_map_idx = get_ref_frame_map_idx(cm, LAST_FRAME);
const int gld_map_idx = get_ref_frame_map_idx(cm, GOLDEN_FRAME);
av1_set_frame_refs(cm, cm->remapped_ref_idx, lst_map_idx, gld_map_idx);
}
// For shown keyframes and S-frames all buffers are refreshed, but we don't
// change any of the mapping.
if ((cm->current_frame.frame_type == KEY_FRAME && cm->show_frame) ||
frame_is_sframe(cm)) {
return;
}
// Initialize the new reference map as a copy of the old one.
int new_map[REF_FRAMES];
memcpy(new_map, cm->remapped_ref_idx, sizeof(new_map));
// The reference management strategy is currently as follows. See
// gop_structure.c for more details of the structure and DOI
// 10.1109/DCC.2018.00045 for a higher-level explanation
//
// * ALTREF_FRAME and GOLDEN_FRAME are kept separate from the other
// references. When we code an ALTREF it refreshes the ALTREF buffer. When
// we code an OVERLAY the old GOLDEN becomes the new ALTREF and the old
// ALTREF (possibly refreshed by the OVERLAY) becomes the new GOLDEN.
// * LAST_FRAME, LAST2_FRAME, and LAST3_FRAME work like a FIFO. When we code
// a frame which does a last-frame update we pick a buffer to refresh and
// then point the LAST_FRAME reference at it. The old LAST_FRAME becomes
// LAST2_FRAME and the old LAST2_FRAME becomes LAST3_FRAME. The old
// LAST3_FRAME is re-used somewhere else.
// * BWDREF, ALTREF2, and EXTREF act like a stack structure, so we can
// "push" and "pop" internal alt-ref frames through the three references.
// * When we code a BRF or internal-ARF (they work the same in this
// structure) we push it onto the bwdref stack. Because we have a finite
// number of buffers, we actually refresh EXTREF, the bottom of the stack,
// and rotate the three references to make EXTREF the top.
// * When we code an INTNL_OVERLAY we refresh BWDREF, then pop it off of the
// bwdref stack and push it into the last-frame FIFO. The old LAST3
// buffer gets pushed out of the last-frame FIFO and becomes the new
// EXTREF, bottom of the bwdref stack.
// * LAST_BIPRED just acts like a LAST_FRAME. The BWDREF will have an
// INTNL_OVERLAY and so can do its own ref map update.
//
// Note that this function runs *after* a frame has been coded, so it does not
// affect reference assignment of the current frame, it only affects future
// frames. This is why we refresh buffers using the old reference map before
// remapping them.
//
// show_existing_frames don't refresh any buffers or send the reference map to
// the decoder, but we can still update our reference map if we want to: the
// decoder will update its map next time we code a non-show-existing frame.
if (frame_update_type == OVERLAY_UPDATE) {
// We want the old golden-frame to become our new ARF so swap the
// references. If cpi->preserve_arf_as_gld == 0 then we will refresh the
// old ARF before it becomes our new GF
assign_new_map(cm, new_map, ALTREF_FRAME, GOLDEN_FRAME);
assign_new_map(cm, new_map, GOLDEN_FRAME, ALTREF_FRAME);
} else if (frame_update_type == INTNL_OVERLAY_UPDATE &&
encode_show_existing_frame(cm)) {
// Note that because encode_show_existing_frame(cm) we don't refresh any
// buffers.
// Pop BWDREF (shown as current frame) from the bwdref stack and make it
// the new LAST_FRAME.
assign_new_map(cm, new_map, LAST_FRAME, BWDREF_FRAME);
// Progress the last-frame FIFO and the bwdref stack
assign_new_map(cm, new_map, LAST2_FRAME, LAST_FRAME);
assign_new_map(cm, new_map, LAST3_FRAME, LAST2_FRAME);
assign_new_map(cm, new_map, BWDREF_FRAME, ALTREF2_FRAME);
assign_new_map(cm, new_map, ALTREF2_FRAME, EXTREF_FRAME);
assign_new_map(cm, new_map, EXTREF_FRAME, LAST3_FRAME);
} else if (frame_update_type == INTNL_ARF_UPDATE &&
!cm->show_existing_frame) {
// We want to push the current frame onto the bwdref stack. We refresh
// EXTREF (the old bottom of the stack) and rotate the references so it
// becomes BWDREF, the top of the stack.
assign_new_map(cm, new_map, BWDREF_FRAME, EXTREF_FRAME);
assign_new_map(cm, new_map, ALTREF2_FRAME, BWDREF_FRAME);
assign_new_map(cm, new_map, EXTREF_FRAME, ALTREF2_FRAME);
}
if ((frame_update_type == LF_UPDATE || frame_update_type == GF_UPDATE ||
frame_update_type == INTNL_OVERLAY_UPDATE) &&
!encode_show_existing_frame(cm) &&
(!cm->show_existing_frame || frame_update_type == INTNL_OVERLAY_UPDATE)) {
// A standard last-frame: we refresh the LAST3_FRAME buffer and then push it
// into the last-frame FIFO.
assign_new_map(cm, new_map, LAST3_FRAME, LAST2_FRAME);
assign_new_map(cm, new_map, LAST2_FRAME, LAST_FRAME);
assign_new_map(cm, new_map, LAST_FRAME, LAST3_FRAME);
}
memcpy(cm->remapped_ref_idx, new_map, sizeof(new_map));
#if DUMP_REF_FRAME_IMAGES == 1
// Dump out all reference frame images.
dump_ref_frame_images(cpi);
#endif // DUMP_REF_FRAME_IMAGES
}
static int get_refresh_frame_flags(const AV1_COMP *const cpi,
const EncodeFrameParams *const frame_params,
FRAME_UPDATE_TYPE frame_update_type) {
const AV1_COMMON *const cm = &cpi->common;
// Switch frames and shown key-frames overwrite all reference slots
if ((frame_params->frame_type == KEY_FRAME && frame_params->show_frame) ||
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;
if (cpi->ext_refresh_frame_flags_pending) {
// Unfortunately the encoder interface reflects the old refresh_*_frame
// flags so we have to replicate the old refresh_frame_flags logic here in
// order to preserve the behaviour of the flag overrides.
refresh_mask |= cpi->ext_refresh_last_frame
<< get_ref_frame_map_idx(cm, LAST3_FRAME);
refresh_mask |= cpi->ext_refresh_bwd_ref_frame
<< get_ref_frame_map_idx(cm, EXTREF_FRAME);
refresh_mask |= cpi->ext_refresh_alt2_ref_frame
<< get_ref_frame_map_idx(cm, ALTREF2_FRAME);
if (frame_update_type == OVERLAY_UPDATE) {
if (!cpi->preserve_arf_as_gld) {
refresh_mask |= cpi->ext_refresh_golden_frame
<< get_ref_frame_map_idx(cm, ALTREF_FRAME);
}
} else {
refresh_mask |= cpi->ext_refresh_golden_frame
<< get_ref_frame_map_idx(cm, GOLDEN_FRAME);
refresh_mask |= cpi->ext_refresh_alt_ref_frame
<< get_ref_frame_map_idx(cm, ALTREF_FRAME);
}
return refresh_mask;
}
// See update_ref_frame_map() for a thorough description of the reference
// buffer management strategy currently in use. This function just decides
// which buffers should be refreshed.
switch (frame_update_type) {
case KF_UPDATE:
// Note that a real shown key-frame or S-frame refreshes every buffer,
// handled in a special case above. This case is for frames which aren't
// really a shown key-frame or S-frame but want to refresh all the
// important buffers.
refresh_mask |= 1 << get_ref_frame_map_idx(cm, LAST3_FRAME);
refresh_mask |= 1 << get_ref_frame_map_idx(cm, EXTREF_FRAME);
refresh_mask |= 1 << get_ref_frame_map_idx(cm, ALTREF2_FRAME);
refresh_mask |= 1 << get_ref_frame_map_idx(cm, GOLDEN_FRAME);
refresh_mask |= 1 << get_ref_frame_map_idx(cm, ALTREF_FRAME);
break;
case LF_UPDATE:
// Refresh LAST3, which becomes the new LAST while LAST becomes LAST2
// and LAST2 becomes the new LAST3 (like a FIFO but circular)
refresh_mask |= 1 << get_ref_frame_map_idx(cm, LAST3_FRAME);
break;
case GF_UPDATE:
// In addition to refreshing the GF buffer, we refresh LAST3 and push it
// into the last-frame FIFO.
refresh_mask |= 1 << get_ref_frame_map_idx(cm, LAST3_FRAME);
refresh_mask |= 1 << get_ref_frame_map_idx(cm, GOLDEN_FRAME);
break;
case OVERLAY_UPDATE:
if (!cpi->preserve_arf_as_gld) {
// The result of our OVERLAY should become the GOLDEN_FRAME but we'd
// like to keep the old GOLDEN as our new ALTREF. So we refresh the
// ALTREF and swap around the ALTREF and GOLDEN references.
refresh_mask |= 1 << get_ref_frame_map_idx(cm, ALTREF_FRAME);
}
break;
case ARF_UPDATE:
refresh_mask |= 1 << get_ref_frame_map_idx(cm, ALTREF_FRAME);
break;
case INTNL_OVERLAY_UPDATE:
// INTNL_OVERLAY may be a show_existing_frame in which case we don't
// refresh anything and the BWDREF or ALTREF2 being shown becomes the new
// LAST_FRAME. But, if it's not a show_existing_frame, then we update as
// though it's a normal LF_UPDATE: we refresh LAST3 and
// update_ref_frame_map() makes that the new LAST_FRAME.
refresh_mask |= 1 << get_ref_frame_map_idx(cm, LAST3_FRAME);
break;
case INTNL_ARF_UPDATE:
if (cpi->oxcf.pass == 2) {
// Push the new ARF2 onto the bwdref stack. We refresh EXTREF which is
// at the bottom of the stack then move it to the top.
refresh_mask |= 1 << get_ref_frame_map_idx(cm, EXTREF_FRAME);
} else {
// ARF2 just gets stored in the ARF2 slot, no reference map change.
refresh_mask |= 1 << get_ref_frame_map_idx(cm, ALTREF2_FRAME);
}
break;
default: assert(0); break;
}
return refresh_mask;
}
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) {
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
AV1_COMMON *const cm = &cpi->common;
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));
if (oxcf->pass == 0 || oxcf->pass == 2) {
check_show_existing_frame(cpi, &frame_params);
frame_params.show_existing_frame &= allow_show_existing(cpi, *frame_flags);
} else {
frame_params.show_existing_frame = 0;
}
int temporal_filtered = 0;
struct lookahead_entry *source = NULL;
struct lookahead_entry *last_source = NULL;
FRAME_UPDATE_TYPE frame_update_type;
if (frame_params.show_existing_frame) {
source = av1_lookahead_pop(cpi->lookahead, flush);
frame_update_type = LF_UPDATE;
} else {
source = choose_frame_source(cpi, &temporal_filtered, &flush, &last_source,
&frame_update_type, &frame_params);
}
// In pass 2 we get the frame_update_type from gf_group
if (oxcf->pass == 2) {
frame_update_type =
cpi->twopass.gf_group.update_type[cpi->twopass.gf_group.index];
}
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;
}
frame_input.source = temporal_filtered ? &cpi->alt_ref_buffer : &source->img;
frame_input.last_source = last_source != NULL ? &last_source->img : NULL;
frame_input.ts_duration = source->ts_end - source->ts_start;
*time_stamp = source->ts_start;
*time_end = source->ts_end;
if (source->ts_start < cpi->first_time_stamp_ever) {
cpi->first_time_stamp_ever = source->ts_start;
cpi->last_end_time_stamp_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;
const int is_overlay = frame_params.show_existing_frame &&
(frame_update_type == OVERLAY_UPDATE ||
frame_update_type == INTNL_OVERLAY_UPDATE);
if (frame_params.show_frame || is_overlay) {
// Shown frames and arf-overlay frames need frame-rate considering
adjust_frame_rate(cpi, source);
}
if (frame_params.show_existing_frame) {
// show_existing_frame implies this frame is shown!
frame_params.show_frame = 1;
} else {
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;
cpi->common.frame_presentation_time = (uint32_t)pts64;
}
if (oxcf->pass == 2 && (!frame_params.show_existing_frame || is_overlay)) {
// GF_GROUP needs updating for arf overlays as well as non-show-existing
av1_get_second_pass_params(cpi, &frame_params, *frame_flags);
frame_update_type =
cpi->twopass.gf_group.update_type[cpi->twopass.gf_group.index];
}
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;
if (!frame_params.show_existing_frame) {
cm->using_qmatrix = cpi->oxcf.using_qm;
cm->min_qmlevel = cpi->oxcf.qm_minlevel;
cm->max_qmlevel = cpi->oxcf.qm_maxlevel;
if (oxcf->pass == 2) {
if (cpi->twopass.gf_group.index == 1 && cpi->oxcf.enable_tpl_model) {
av1_configure_buffer_updates(cpi, &frame_params, frame_update_type, 0);
av1_set_frame_size(cpi, cm->width, cm->height);
av1_tpl_setup_stats(cpi, &frame_input);
assert(cpi->num_gf_group_show_frames == 1);
}
}
}
// Work out some encoding parameters specific to the pass:
if (oxcf->pass == 0) {
if (cpi->oxcf.rc_mode == AOM_CBR) {
av1_rc_get_one_pass_cbr_params(cpi, &frame_update_type, &frame_params,
*frame_flags);
} else {
av1_rc_get_one_pass_vbr_params(cpi, &frame_update_type, &frame_params,
*frame_flags);
}
} else if (oxcf->pass == 1) {
cpi->td.mb.e_mbd.lossless[0] = is_lossless_requested(&cpi->oxcf);
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 != INTNL_OVERLAY_UPDATE) {
frame_params.frame_type = KEY_FRAME;
} else {
frame_params.frame_type = INTER_FRAME;
}
} else if (oxcf->pass == 2) {
#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 (oxcf->pass == 0 || oxcf->pass == 2) set_ext_overrides(cpi, &frame_params);
// 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;
av1_configure_buffer_updates(cpi, &frame_params, frame_update_type,
force_refresh_all);
if (oxcf->pass == 0 || oxcf->pass == 2) {
// Work out which reference frame slots may be used.
frame_params.ref_frame_flags = get_ref_frame_flags(cpi);
frame_params.primary_ref_frame =
choose_primary_ref_frame(cpi, &frame_params);
frame_params.order_offset =
get_order_offset(&cpi->twopass.gf_group, &frame_params);
frame_params.refresh_frame_flags =
get_refresh_frame_flags(cpi, &frame_params, frame_update_type);
}
// 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));
if (av1_encode(cpi, dest, &frame_input, &frame_params, &frame_results) !=
AOM_CODEC_OK) {
return AOM_CODEC_ERROR;
}
if (oxcf->pass == 2) cpi->num_gf_group_show_frames += frame_params.show_frame;
if (oxcf->pass == 0 || oxcf->pass == 2) {
// First pass doesn't modify reference buffer assignment or produce frame
// flags
update_frame_flags(cpi, frame_flags);
update_ref_frame_map(cpi, frame_update_type);
}
if (oxcf->pass == 2) {
#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
av1_twopass_postencode_update(cpi);
}
if (oxcf->pass == 0 || oxcf->pass == 2) {
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(cpi);
}
return AOM_CODEC_OK;
}