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ffmpeg/libavcodec/vvc/refs.c

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/*
* VVC reference management
*
* Copyright (C) 2023 Nuo Mi
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdatomic.h>
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "libavcodec/refstruct.h"
#include "libavcodec/thread.h"
#include "refs.h"
#define VVC_FRAME_FLAG_OUTPUT (1 << 0)
#define VVC_FRAME_FLAG_SHORT_REF (1 << 1)
#define VVC_FRAME_FLAG_LONG_REF (1 << 2)
#define VVC_FRAME_FLAG_BUMPING (1 << 3)
typedef struct FrameProgress {
atomic_int progress[VVC_PROGRESS_LAST];
VVCProgressListener *listener[VVC_PROGRESS_LAST];
AVMutex lock;
AVCond cond;
uint8_t has_lock;
uint8_t has_cond;
} FrameProgress;
void ff_vvc_unref_frame(VVCFrameContext *fc, VVCFrame *frame, int flags)
{
/* frame->frame can be NULL if context init failed */
if (!frame->frame || !frame->frame->buf[0])
return;
frame->flags &= ~flags;
if (!frame->flags) {
av_frame_unref(frame->frame);
ff_refstruct_unref(&frame->sps);
ff_refstruct_unref(&frame->pps);
ff_refstruct_unref(&frame->progress);
ff_refstruct_unref(&frame->tab_dmvr_mvf);
ff_refstruct_unref(&frame->rpl);
frame->nb_rpl_elems = 0;
ff_refstruct_unref(&frame->rpl_tab);
frame->collocated_ref = NULL;
}
}
const RefPicList *ff_vvc_get_ref_list(const VVCFrameContext *fc, const VVCFrame *ref, int x0, int y0)
{
const int x_cb = x0 >> fc->ps.sps->ctb_log2_size_y;
const int y_cb = y0 >> fc->ps.sps->ctb_log2_size_y;
const int pic_width_cb = fc->ps.pps->ctb_width;
const int ctb_addr_rs = y_cb * pic_width_cb + x_cb;
return (const RefPicList *)ref->rpl_tab[ctb_addr_rs];
}
void ff_vvc_clear_refs(VVCFrameContext *fc)
{
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++)
ff_vvc_unref_frame(fc, &fc->DPB[i],
VVC_FRAME_FLAG_SHORT_REF | VVC_FRAME_FLAG_LONG_REF);
}
void ff_vvc_flush_dpb(VVCFrameContext *fc)
{
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++)
ff_vvc_unref_frame(fc, &fc->DPB[i], ~0);
}
static void free_progress(FFRefStructOpaque unused, void *obj)
{
FrameProgress *p = (FrameProgress *)obj;
if (p->has_cond)
ff_cond_destroy(&p->cond);
if (p->has_lock)
ff_mutex_destroy(&p->lock);
}
static FrameProgress *alloc_progress(void)
{
FrameProgress *p = ff_refstruct_alloc_ext(sizeof(*p), 0, NULL, free_progress);
if (p) {
p->has_lock = !ff_mutex_init(&p->lock, NULL);
p->has_cond = !ff_cond_init(&p->cond, NULL);
if (!p->has_lock || !p->has_cond)
ff_refstruct_unref(&p);
}
return p;
}
static VVCFrame *alloc_frame(VVCContext *s, VVCFrameContext *fc)
{
const VVCSPS *sps = fc->ps.sps;
const VVCPPS *pps = fc->ps.pps;
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
int ret;
VVCFrame *frame = &fc->DPB[i];
VVCWindow *win = &frame->scaling_win;
if (frame->frame->buf[0])
continue;
frame->sps = ff_refstruct_ref_c(fc->ps.sps);
frame->pps = ff_refstruct_ref_c(fc->ps.pps);
ret = ff_thread_get_buffer(s->avctx, frame->frame, AV_GET_BUFFER_FLAG_REF);
if (ret < 0)
return NULL;
frame->rpl = ff_refstruct_allocz(s->current_frame.nb_units * sizeof(RefPicListTab));
if (!frame->rpl)
goto fail;
frame->nb_rpl_elems = s->current_frame.nb_units;
frame->tab_dmvr_mvf = ff_refstruct_pool_get(fc->tab_dmvr_mvf_pool);
if (!frame->tab_dmvr_mvf)
goto fail;
frame->rpl_tab = ff_refstruct_pool_get(fc->rpl_tab_pool);
if (!frame->rpl_tab)
goto fail;
frame->ctb_count = pps->ctb_width * pps->ctb_height;
for (int j = 0; j < frame->ctb_count; j++)
frame->rpl_tab[j] = frame->rpl;
win->left_offset = pps->r->pps_scaling_win_left_offset << sps->hshift[CHROMA];
win->right_offset = pps->r->pps_scaling_win_right_offset << sps->hshift[CHROMA];
win->top_offset = pps->r->pps_scaling_win_top_offset << sps->vshift[CHROMA];
win->bottom_offset = pps->r->pps_scaling_win_bottom_offset << sps->vshift[CHROMA];
frame->ref_width = pps->r->pps_pic_width_in_luma_samples - win->left_offset - win->right_offset;
frame->ref_height = pps->r->pps_pic_height_in_luma_samples - win->bottom_offset - win->top_offset;
frame->progress = alloc_progress();
if (!frame->progress)
goto fail;
return frame;
fail:
ff_vvc_unref_frame(fc, frame, ~0);
return NULL;
}
av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
return NULL;
}
int ff_vvc_set_new_ref(VVCContext *s, VVCFrameContext *fc, AVFrame **frame)
{
const VVCPH *ph= &fc->ps.ph;
const int poc = ph->poc;
VVCFrame *ref;
/* check that this POC doesn't already exist */
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if (frame->frame->buf[0] && frame->sequence == s->seq_decode &&
frame->poc == poc) {
av_log(s->avctx, AV_LOG_ERROR, "Duplicate POC in a sequence: %d.\n", poc);
return AVERROR_INVALIDDATA;
}
}
ref = alloc_frame(s, fc);
if (!ref)
return AVERROR(ENOMEM);
*frame = ref->frame;
fc->ref = ref;
if (s->no_output_before_recovery_flag && (IS_RASL(s) || !GDR_IS_RECOVERED(s)))
ref->flags = VVC_FRAME_FLAG_SHORT_REF;
else if (ph->r->ph_pic_output_flag)
ref->flags = VVC_FRAME_FLAG_OUTPUT | VVC_FRAME_FLAG_SHORT_REF;
if (!ph->r->ph_non_ref_pic_flag)
ref->flags |= VVC_FRAME_FLAG_SHORT_REF;
ref->poc = poc;
ref->sequence = s->seq_decode;
ref->frame->crop_left = fc->ps.pps->r->pps_conf_win_left_offset << fc->ps.sps->hshift[CHROMA];
ref->frame->crop_right = fc->ps.pps->r->pps_conf_win_right_offset << fc->ps.sps->hshift[CHROMA];
ref->frame->crop_top = fc->ps.pps->r->pps_conf_win_top_offset << fc->ps.sps->vshift[CHROMA];
ref->frame->crop_bottom = fc->ps.pps->r->pps_conf_win_bottom_offset << fc->ps.sps->vshift[CHROMA];
return 0;
}
int ff_vvc_output_frame(VVCContext *s, VVCFrameContext *fc, AVFrame *out, const int no_output_of_prior_pics_flag, int flush)
{
const VVCSPS *sps = fc->ps.sps;
do {
int nb_output = 0;
int min_poc = INT_MAX;
int min_idx, ret;
if (no_output_of_prior_pics_flag) {
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if (!(frame->flags & VVC_FRAME_FLAG_BUMPING) && frame->poc != fc->ps.ph.poc &&
frame->sequence == s->seq_output) {
ff_vvc_unref_frame(fc, frame, VVC_FRAME_FLAG_OUTPUT);
}
}
}
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if ((frame->flags & VVC_FRAME_FLAG_OUTPUT) &&
frame->sequence == s->seq_output) {
nb_output++;
if (frame->poc < min_poc || nb_output == 1) {
min_poc = frame->poc;
min_idx = i;
}
}
}
/* wait for more frames before output */
if (!flush && s->seq_output == s->seq_decode && sps &&
nb_output <= sps->r->sps_dpb_params.dpb_max_num_reorder_pics[sps->r->sps_max_sublayers_minus1])
return 0;
if (nb_output) {
VVCFrame *frame = &fc->DPB[min_idx];
ret = av_frame_ref(out, frame->frame);
if (frame->flags & VVC_FRAME_FLAG_BUMPING)
ff_vvc_unref_frame(fc, frame, VVC_FRAME_FLAG_OUTPUT | VVC_FRAME_FLAG_BUMPING);
else
ff_vvc_unref_frame(fc, frame, VVC_FRAME_FLAG_OUTPUT);
if (ret < 0)
return ret;
av_log(s->avctx, AV_LOG_DEBUG,
"Output frame with POC %d.\n", frame->poc);
return 1;
}
if (s->seq_output != s->seq_decode)
s->seq_output = (s->seq_output + 1) & 0xff;
else
break;
} while (1);
return 0;
}
void ff_vvc_bump_frame(VVCContext *s, VVCFrameContext *fc)
{
const VVCSPS *sps = fc->ps.sps;
const int poc = fc->ps.ph.poc;
int dpb = 0;
int min_poc = INT_MAX;
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if ((frame->flags) &&
frame->sequence == s->seq_output &&
frame->poc != poc) {
dpb++;
}
}
if (sps && dpb >= sps->r->sps_dpb_params.dpb_max_dec_pic_buffering_minus1[sps->r->sps_max_sublayers_minus1] + 1) {
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if ((frame->flags) &&
frame->sequence == s->seq_output &&
frame->poc != poc) {
if (frame->flags == VVC_FRAME_FLAG_OUTPUT && frame->poc < min_poc) {
min_poc = frame->poc;
}
}
}
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if (frame->flags & VVC_FRAME_FLAG_OUTPUT &&
frame->sequence == s->seq_output &&
frame->poc <= min_poc) {
frame->flags |= VVC_FRAME_FLAG_BUMPING;
}
}
dpb--;
}
}
static VVCFrame *find_ref_idx(VVCContext *s, VVCFrameContext *fc, int poc, uint8_t use_msb)
{
const unsigned mask = use_msb ? ~0 : fc->ps.sps->max_pic_order_cnt_lsb - 1;
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *ref = &fc->DPB[i];
if (ref->frame->buf[0] && ref->sequence == s->seq_decode) {
if ((ref->poc & mask) == poc)
return ref;
}
}
return NULL;
}
static void mark_ref(VVCFrame *frame, int flag)
{
frame->flags &= ~(VVC_FRAME_FLAG_LONG_REF | VVC_FRAME_FLAG_SHORT_REF);
frame->flags |= flag;
}
static VVCFrame *generate_missing_ref(VVCContext *s, VVCFrameContext *fc, int poc)
{
const VVCSPS *sps = fc->ps.sps;
const VVCPPS *pps = fc->ps.pps;
VVCFrame *frame;
frame = alloc_frame(s, fc);
if (!frame)
return NULL;
if (!s->avctx->hwaccel) {
if (!sps->pixel_shift) {
for (int i = 0; frame->frame->buf[i]; i++)
memset(frame->frame->buf[i]->data, 1 << (sps->bit_depth - 1),
frame->frame->buf[i]->size);
} else {
for (int i = 0; frame->frame->data[i]; i++)
for (int y = 0; y < (pps->height >> sps->vshift[i]); y++) {
uint8_t *dst = frame->frame->data[i] + y * frame->frame->linesize[i];
AV_WN16(dst, 1 << (sps->bit_depth - 1));
av_memcpy_backptr(dst + 2, 2, 2*(pps->width >> sps->hshift[i]) - 2);
}
}
}
frame->poc = poc;
frame->sequence = s->seq_decode;
frame->flags = 0;
ff_vvc_report_frame_finished(frame);
return frame;
}
#define CHECK_MAX(d) (frame->ref_##d * frame->sps->r->sps_pic_##d##_max_in_luma_samples >= ref->ref_##d * (frame->pps->r->pps_pic_##d##_in_luma_samples - max))
#define CHECK_SAMPLES(d) (frame->pps->r->pps_pic_##d##_in_luma_samples == ref->pps->r->pps_pic_##d##_in_luma_samples)
static int check_candidate_ref(const VVCFrame *frame, const VVCRefPic *refp)
{
const VVCFrame *ref = refp->ref;
if (refp->is_scaled) {
const int max = FFMAX(8, frame->sps->min_cb_size_y);
return frame->ref_width * 2 >= ref->ref_width &&
frame->ref_height * 2 >= ref->ref_height &&
frame->ref_width <= ref->ref_width * 8 &&
frame->ref_height <= ref->ref_height * 8 &&
CHECK_MAX(width) && CHECK_MAX(height);
}
return CHECK_SAMPLES(width) && CHECK_SAMPLES(height);
}
#define RPR_SCALE(f) (((ref->f << 14) + (fc->ref->f >> 1)) / fc->ref->f)
/* add a reference with the given poc to the list and mark it as used in DPB */
static int add_candidate_ref(VVCContext *s, VVCFrameContext *fc, RefPicList *list,
int poc, int ref_flag, uint8_t use_msb)
{
VVCFrame *ref = find_ref_idx(s, fc, poc, use_msb);
VVCRefPic *refp = &list->refs[list->nb_refs];
if (ref == fc->ref || list->nb_refs >= VVC_MAX_REF_ENTRIES)
return AVERROR_INVALIDDATA;
if (!ref) {
ref = generate_missing_ref(s, fc, poc);
if (!ref)
return AVERROR(ENOMEM);
}
refp->poc = poc;
refp->ref = ref;
refp->is_lt = ref_flag & VVC_FRAME_FLAG_LONG_REF;
refp->is_scaled = ref->sps->r->sps_num_subpics_minus1 != fc->ref->sps->r->sps_num_subpics_minus1||
memcmp(&ref->scaling_win, &fc->ref->scaling_win, sizeof(ref->scaling_win)) ||
ref->pps->r->pps_pic_width_in_luma_samples != fc->ref->pps->r->pps_pic_width_in_luma_samples ||
ref->pps->r->pps_pic_height_in_luma_samples != fc->ref->pps->r->pps_pic_height_in_luma_samples;
if (!check_candidate_ref(fc->ref, refp))
return AVERROR_INVALIDDATA;
if (refp->is_scaled) {
refp->scale[0] = RPR_SCALE(ref_width);
refp->scale[1] = RPR_SCALE(ref_height);
}
list->nb_refs++;
mark_ref(ref, ref_flag);
return 0;
}
static int init_slice_rpl(const VVCFrameContext *fc, SliceContext *sc)
{
VVCFrame *frame = fc->ref;
const VVCSH *sh = &sc->sh;
if (sc->slice_idx >= frame->nb_rpl_elems)
return AVERROR_INVALIDDATA;
for (int i = 0; i < sh->num_ctus_in_curr_slice; i++) {
const int rs = sh->ctb_addr_in_curr_slice[i];
frame->rpl_tab[rs] = frame->rpl + sc->slice_idx;
}
sc->rpl = frame->rpl_tab[sh->ctb_addr_in_curr_slice[0]]->refPicList;
return 0;
}
static int delta_poc_st(const H266RefPicListStruct *rpls,
const int lx, const int i, const VVCSPS *sps)
{
int abs_delta_poc_st = rpls->abs_delta_poc_st[i];
if (!((sps->r->sps_weighted_pred_flag ||
sps->r->sps_weighted_bipred_flag) && i != 0))
abs_delta_poc_st++;
return (1 - 2 * rpls->strp_entry_sign_flag[i]) * abs_delta_poc_st;
}
static int poc_lt(int *prev_delta_poc_msb, const int poc, const H266RefPicLists *ref_lists,
const int lx, const int j, const int max_poc_lsb)
{
const H266RefPicListStruct *rpls = ref_lists->rpl_ref_list + lx;
int lt_poc = rpls->ltrp_in_header_flag ? ref_lists->poc_lsb_lt[lx][j] : rpls->rpls_poc_lsb_lt[j];
if (ref_lists->delta_poc_msb_cycle_present_flag[lx][j]) {
const uint32_t delta = ref_lists->delta_poc_msb_cycle_lt[lx][j] + *prev_delta_poc_msb;
lt_poc += poc - delta * max_poc_lsb - (poc & (max_poc_lsb - 1));
*prev_delta_poc_msb = delta;
}
return lt_poc;
}
int ff_vvc_slice_rpl(VVCContext *s, VVCFrameContext *fc, SliceContext *sc)
{
const VVCSPS *sps = fc->ps.sps;
const H266RawPPS *pps = fc->ps.pps->r;
const VVCPH *ph = &fc->ps.ph;
const H266RawSliceHeader *rsh = sc->sh.r;
const int max_poc_lsb = sps->max_pic_order_cnt_lsb;
const H266RefPicLists *ref_lists =
pps->pps_rpl_info_in_ph_flag ? &ph->r->ph_ref_pic_lists : &rsh->sh_ref_pic_lists;
int ret = 0;
ret = init_slice_rpl(fc, sc);
if (ret < 0)
return ret;
for (int lx = L0; lx <= L1; lx++) {
const H266RefPicListStruct *rpls = ref_lists->rpl_ref_list + lx;
RefPicList *rpl = sc->rpl + lx;
int poc_base = ph->poc;
int prev_delta_poc_msb = 0;
rpl->nb_refs = 0;
for (int i = 0, j = 0; i < rpls->num_ref_entries; i++) {
int poc;
if (!rpls->inter_layer_ref_pic_flag[i]) {
int use_msb = 1;
int ref_flag;
if (rpls->st_ref_pic_flag[i]) {
poc = poc_base + delta_poc_st(rpls, lx, i, sps);
poc_base = poc;
ref_flag = VVC_FRAME_FLAG_SHORT_REF;
} else {
use_msb = ref_lists->delta_poc_msb_cycle_present_flag[lx][j];
poc = poc_lt(&prev_delta_poc_msb, ph->poc, ref_lists, lx, j, max_poc_lsb);
ref_flag = VVC_FRAME_FLAG_LONG_REF;
j++;
}
ret = add_candidate_ref(s, fc, rpl, poc, ref_flag, use_msb);
if (ret < 0)
return ret;
} else {
// OPI_B_3.bit and VPS_A_3.bit should cover this
avpriv_report_missing_feature(fc->log_ctx, "Inter layer ref");
ret = AVERROR_PATCHWELCOME;
return ret;
}
}
if (ph->r->ph_temporal_mvp_enabled_flag &&
(!rsh->sh_collocated_from_l0_flag) == lx &&
rsh->sh_collocated_ref_idx < rpl->nb_refs) {
const VVCRefPic *refp = rpl->refs + rsh->sh_collocated_ref_idx;
if (refp->is_scaled || refp->ref->sps->ctb_log2_size_y != sps->ctb_log2_size_y)
return AVERROR_INVALIDDATA;
fc->ref->collocated_ref = refp->ref;
}
}
return 0;
}
int ff_vvc_frame_rpl(VVCContext *s, VVCFrameContext *fc, SliceContext *sc)
{
int ret = 0;
/* clear the reference flags on all frames except the current one */
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++) {
VVCFrame *frame = &fc->DPB[i];
if (frame == fc->ref)
continue;
mark_ref(frame, 0);
}
if ((ret = ff_vvc_slice_rpl(s, fc, sc)) < 0)
goto fail;
fail:
/* release any frames that are now unused */
for (int i = 0; i < FF_ARRAY_ELEMS(fc->DPB); i++)
ff_vvc_unref_frame(fc, &fc->DPB[i], 0);
return ret;
}
void ff_vvc_report_frame_finished(VVCFrame *frame)
{
ff_vvc_report_progress(frame, VVC_PROGRESS_MV, INT_MAX);
ff_vvc_report_progress(frame, VVC_PROGRESS_PIXEL, INT_MAX);
}
static int is_progress_done(const FrameProgress *p, const VVCProgressListener *l)
{
return p->progress[l->vp] > l->y;
}
static void add_listener(VVCProgressListener **prev, VVCProgressListener *l)
{
l->next = *prev;
*prev = l;
}
static VVCProgressListener* remove_listener(VVCProgressListener **prev, VVCProgressListener *l)
{
*prev = l->next;
l->next = NULL;
return l;
}
static VVCProgressListener* get_done_listener(FrameProgress *p, const VVCProgress vp)
{
VVCProgressListener *list = NULL;
VVCProgressListener **prev = &p->listener[vp];
while (*prev) {
if (is_progress_done(p, *prev)) {
VVCProgressListener *l = remove_listener(prev, *prev);
add_listener(&list, l);
} else {
prev = &(*prev)->next;
}
}
return list;
}
void ff_vvc_report_progress(VVCFrame *frame, const VVCProgress vp, const int y)
{
FrameProgress *p = frame->progress;
VVCProgressListener *l = NULL;
ff_mutex_lock(&p->lock);
if (p->progress[vp] < y) {
// Due to the nature of thread scheduling, later progress may reach this point before earlier progress.
// Therefore, we only update the progress when p->progress[vp] < y.
p->progress[vp] = y;
l = get_done_listener(p, vp);
ff_cond_signal(&p->cond);
}
ff_mutex_unlock(&p->lock);
while (l) {
l->progress_done(l);
l = l->next;
}
}
void ff_vvc_add_progress_listener(VVCFrame *frame, VVCProgressListener *l)
{
FrameProgress *p = frame->progress;
ff_mutex_lock(&p->lock);
if (is_progress_done(p, l)) {
ff_mutex_unlock(&p->lock);
l->progress_done(l);
} else {
add_listener(p->listener + l->vp, l);
ff_mutex_unlock(&p->lock);
}
}
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