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ffmpeg/libavcodec/hevc/refs.c

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/*
* HEVC video decoder
*
* Copyright (C) 2012 - 2013 Guillaume Martres
* Copyright (C) 2012 - 2013 Gildas Cocherel
*
* 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 "libavutil/mem.h"
#include "libavutil/stereo3d.h"
#include "container_fifo.h"
#include "decode.h"
#include "hevc.h"
#include "hevcdec.h"
#include "progressframe.h"
#include "refstruct.h"
void ff_hevc_unref_frame(HEVCFrame *frame, int flags)
{
frame->flags &= ~flags;
if (!frame->flags) {
ff_progress_frame_unref(&frame->tf);
av_frame_unref(frame->frame_grain);
frame->needs_fg = 0;
ff_refstruct_unref(&frame->pps);
ff_refstruct_unref(&frame->tab_mvf);
ff_refstruct_unref(&frame->rpl);
frame->nb_rpl_elems = 0;
ff_refstruct_unref(&frame->rpl_tab);
frame->refPicList = NULL;
ff_refstruct_unref(&frame->hwaccel_picture_private);
}
}
const RefPicList *ff_hevc_get_ref_list(const HEVCFrame *ref, int x0, int y0)
{
const HEVCSPS *sps = ref->pps->sps;
int x_cb = x0 >> sps->log2_ctb_size;
int y_cb = y0 >> sps->log2_ctb_size;
int pic_width_cb = sps->ctb_width;
int ctb_addr_ts = ref->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
return &ref->rpl_tab[ctb_addr_ts]->refPicList[0];
}
void ff_hevc_clear_refs(HEVCLayerContext *l)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++)
ff_hevc_unref_frame(&l->DPB[i],
HEVC_FRAME_FLAG_SHORT_REF |
HEVC_FRAME_FLAG_LONG_REF);
}
void ff_hevc_flush_dpb(HEVCContext *s)
{
for (int layer = 0; layer < FF_ARRAY_ELEMS(s->layers); layer++) {
HEVCLayerContext *l = &s->layers[layer];
for (int i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++)
ff_hevc_unref_frame(&l->DPB[i], ~0);
}
}
static HEVCFrame *alloc_frame(HEVCContext *s, HEVCLayerContext *l)
{
const HEVCVPS *vps = l->sps->vps;
const int view_id = vps->view_id[s->cur_layer];
int i, j, ret;
for (i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++) {
HEVCFrame *frame = &l->DPB[i];
if (frame->f)
continue;
ret = ff_progress_frame_alloc(s->avctx, &frame->tf);
if (ret < 0)
return NULL;
// Add LCEVC SEI metadata here, as it's needed in get_buffer()
if (s->sei.common.lcevc.info) {
HEVCSEILCEVC *lcevc = &s->sei.common.lcevc;
ret = ff_frame_new_side_data_from_buf(s->avctx, frame->tf.f,
AV_FRAME_DATA_LCEVC, &lcevc->info);
if (ret < 0)
goto fail;
}
// add view ID side data if it's nontrivial
if (vps->nb_layers > 1 || view_id) {
HEVCSEITDRDI *tdrdi = &s->sei.tdrdi;
AVFrameSideData *sd = av_frame_side_data_new(&frame->f->side_data,
&frame->f->nb_side_data,
AV_FRAME_DATA_VIEW_ID,
sizeof(int), 0);
if (!sd)
goto fail;
*(int*)sd->data = view_id;
if (tdrdi->num_ref_displays) {
AVStereo3D *stereo_3d;
stereo_3d = av_stereo3d_create_side_data(frame->f);
if (!stereo_3d)
goto fail;
stereo_3d->type = AV_STEREO3D_FRAMESEQUENCE;
if (tdrdi->left_view_id[0] == view_id)
stereo_3d->view = AV_STEREO3D_VIEW_LEFT;
else if (tdrdi->right_view_id[0] == view_id)
stereo_3d->view = AV_STEREO3D_VIEW_RIGHT;
else
stereo_3d->view = AV_STEREO3D_VIEW_UNSPEC;
}
}
ret = ff_progress_frame_get_buffer(s->avctx, &frame->tf,
AV_GET_BUFFER_FLAG_REF);
if (ret < 0)
return NULL;
frame->rpl = ff_refstruct_allocz(s->pkt.nb_nals * sizeof(*frame->rpl));
if (!frame->rpl)
goto fail;
frame->nb_rpl_elems = s->pkt.nb_nals;
frame->tab_mvf = ff_refstruct_pool_get(l->tab_mvf_pool);
if (!frame->tab_mvf)
goto fail;
frame->rpl_tab = ff_refstruct_pool_get(l->rpl_tab_pool);
if (!frame->rpl_tab)
goto fail;
frame->ctb_count = l->sps->ctb_width * l->sps->ctb_height;
for (j = 0; j < frame->ctb_count; j++)
frame->rpl_tab[j] = frame->rpl;
if (s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD)
frame->f->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
if ((s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD) ||
(s->sei.picture_timing.picture_struct == AV_PICTURE_STRUCTURE_BOTTOM_FIELD))
frame->f->flags |= AV_FRAME_FLAG_INTERLACED;
ret = ff_hwaccel_frame_priv_alloc(s->avctx, &frame->hwaccel_picture_private);
if (ret < 0)
goto fail;
frame->pps = ff_refstruct_ref_c(s->pps);
return frame;
fail:
ff_hevc_unref_frame(frame, ~0);
return NULL;
}
av_log(s->avctx, AV_LOG_ERROR, "Error allocating frame, DPB full.\n");
return NULL;
}
int ff_hevc_set_new_ref(HEVCContext *s, HEVCLayerContext *l, int poc)
{
HEVCFrame *ref;
int i;
/* check that this POC doesn't already exist */
for (i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++) {
HEVCFrame *frame = &l->DPB[i];
if (frame->f && 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, l);
if (!ref)
return AVERROR(ENOMEM);
s->cur_frame = ref;
l->cur_frame = ref;
s->collocated_ref = NULL;
ref->base_layer_frame = (l != &s->layers[0] && s->layers[0].cur_frame) ?
s->layers[0].cur_frame - s->layers[0].DPB : -1;
if (s->sh.pic_output_flag)
ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
else
ref->flags = HEVC_FRAME_FLAG_SHORT_REF;
ref->poc = poc;
ref->f->crop_left = l->sps->output_window.left_offset;
ref->f->crop_right = l->sps->output_window.right_offset;
ref->f->crop_top = l->sps->output_window.top_offset;
ref->f->crop_bottom = l->sps->output_window.bottom_offset;
return 0;
}
static void unref_missing_refs(HEVCLayerContext *l)
{
for (int i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++) {
HEVCFrame *frame = &l->DPB[i];
if (frame->flags & HEVC_FRAME_FLAG_UNAVAILABLE) {
ff_hevc_unref_frame(frame, ~0);
}
}
}
int ff_hevc_output_frames(HEVCContext *s,
unsigned layers_active_decode, unsigned layers_active_output,
unsigned max_output, unsigned max_dpb, int discard)
{
while (1) {
int nb_dpb[HEVC_VPS_MAX_LAYERS] = { 0 };
int nb_output = 0;
int min_poc = INT_MAX;
int min_layer = -1;
int min_idx, ret = 0;
for (int layer = 0; layer < FF_ARRAY_ELEMS(s->layers); layer++) {
HEVCLayerContext *l = &s->layers[layer];
if (!(layers_active_decode & (1 << layer)))
continue;
for (int i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++) {
HEVCFrame *frame = &l->DPB[i];
if (frame->flags & HEVC_FRAME_FLAG_OUTPUT) {
// nb_output counts AUs with an output-pending frame
// in at least one layer
if (!(frame->base_layer_frame >= 0 &&
(s->layers[0].DPB[frame->base_layer_frame].flags & HEVC_FRAME_FLAG_OUTPUT)))
nb_output++;
if (min_layer < 0 || frame->poc < min_poc) {
min_poc = frame->poc;
min_idx = i;
min_layer = layer;
}
}
nb_dpb[layer] += !!frame->flags;
}
}
if (nb_output > max_output ||
(nb_output &&
(nb_dpb[0] > max_dpb || nb_dpb[1] > max_dpb))) {
HEVCFrame *frame = &s->layers[min_layer].DPB[min_idx];
AVFrame *f = frame->needs_fg ? frame->frame_grain : frame->f;
int output = !discard && (layers_active_output & (1 << min_layer));
if (output) {
f->pkt_dts = s->pkt_dts;
ret = ff_container_fifo_write(s->output_fifo, f);
}
ff_hevc_unref_frame(frame, HEVC_FRAME_FLAG_OUTPUT);
if (ret < 0)
return ret;
av_log(s->avctx, AV_LOG_DEBUG, "%s frame with POC %d/%d.\n",
output ? "Output" : "Discarded", min_layer, frame->poc);
continue;
}
return 0;
}
}
static int init_slice_rpl(HEVCContext *s)
{
HEVCFrame *frame = s->cur_frame;
int ctb_count = frame->ctb_count;
int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[s->sh.slice_segment_addr];
int i;
if (s->slice_idx >= frame->nb_rpl_elems)
return AVERROR_INVALIDDATA;
for (i = ctb_addr_ts; i < ctb_count; i++)
frame->rpl_tab[i] = frame->rpl + s->slice_idx;
frame->refPicList = (RefPicList *)frame->rpl_tab[ctb_addr_ts];
return 0;
}
int ff_hevc_slice_rpl(HEVCContext *s)
{
SliceHeader *sh = &s->sh;
uint8_t nb_list = sh->slice_type == HEVC_SLICE_B ? 2 : 1;
uint8_t list_idx;
int i, j, ret;
ret = init_slice_rpl(s);
if (ret < 0)
return ret;
if (!(s->rps[ST_CURR_BEF].nb_refs + s->rps[ST_CURR_AFT].nb_refs +
s->rps[LT_CURR].nb_refs +
s->rps[INTER_LAYER0].nb_refs + s->rps[INTER_LAYER1].nb_refs) &&
!s->pps->pps_curr_pic_ref_enabled_flag) {
av_log(s->avctx, AV_LOG_ERROR, "Zero refs in the frame RPS.\n");
return AVERROR_INVALIDDATA;
}
for (list_idx = 0; list_idx < nb_list; list_idx++) {
RefPicList rpl_tmp = { { 0 } };
RefPicList *rpl = &s->cur_frame->refPicList[list_idx];
/* The order of the elements is
* ST_CURR_BEF - INTER_LAYER0 - ST_CURR_AFT - LT_CURR - INTER_LAYER1 for the L0 and
* ST_CURR_AFT - INTER_LAYER1 - ST_CURR_BEF - LT_CURR - INTER_LAYER0 for the L1 */
int cand_lists[] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
list_idx ? INTER_LAYER1 : INTER_LAYER0,
list_idx ? ST_CURR_BEF : ST_CURR_AFT,
LT_CURR,
list_idx ? INTER_LAYER0 : INTER_LAYER1
};
/* concatenate the candidate lists for the current frame */
while (rpl_tmp.nb_refs < sh->nb_refs[list_idx]) {
for (i = 0; i < FF_ARRAY_ELEMS(cand_lists); i++) {
RefPicList *rps = &s->rps[cand_lists[i]];
for (j = 0; j < rps->nb_refs && rpl_tmp.nb_refs < HEVC_MAX_REFS; j++) {
rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j];
// multiview inter-layer refs are treated as long-term here,
// cf. G.8.1.3
rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = cand_lists[i] == LT_CURR ||
cand_lists[i] == INTER_LAYER0 ||
cand_lists[i] == INTER_LAYER1;
rpl_tmp.nb_refs++;
}
}
// Construct RefPicList0, RefPicList1 (8-8, 8-10)
if (s->pps->pps_curr_pic_ref_enabled_flag && rpl_tmp.nb_refs < HEVC_MAX_REFS) {
rpl_tmp.list[rpl_tmp.nb_refs] = s->cur_frame->poc;
rpl_tmp.ref[rpl_tmp.nb_refs] = s->cur_frame;
rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = 1;
rpl_tmp.nb_refs++;
}
}
/* reorder the references if necessary */
if (sh->rpl_modification_flag[list_idx]) {
for (i = 0; i < sh->nb_refs[list_idx]; i++) {
int idx = sh->list_entry_lx[list_idx][i];
if (idx >= rpl_tmp.nb_refs) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid reference index.\n");
return AVERROR_INVALIDDATA;
}
rpl->list[i] = rpl_tmp.list[idx];
rpl->ref[i] = rpl_tmp.ref[idx];
rpl->isLongTerm[i] = rpl_tmp.isLongTerm[idx];
rpl->nb_refs++;
}
} else {
memcpy(rpl, &rpl_tmp, sizeof(*rpl));
rpl->nb_refs = FFMIN(rpl->nb_refs, sh->nb_refs[list_idx]);
}
// 8-9
if (s->pps->pps_curr_pic_ref_enabled_flag &&
!sh->rpl_modification_flag[list_idx] &&
rpl_tmp.nb_refs > sh->nb_refs[L0]) {
rpl->list[sh->nb_refs[L0] - 1] = s->cur_frame->poc;
rpl->ref[sh->nb_refs[L0] - 1] = s->cur_frame;
}
if (sh->collocated_list == list_idx &&
sh->collocated_ref_idx < rpl->nb_refs)
s->collocated_ref = rpl->ref[sh->collocated_ref_idx];
}
return 0;
}
static HEVCFrame *find_ref_idx(HEVCContext *s, HEVCLayerContext *l,
int poc, uint8_t use_msb)
{
int mask = use_msb ? ~0 : (1 << l->sps->log2_max_poc_lsb) - 1;
int i;
for (i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++) {
HEVCFrame *ref = &l->DPB[i];
if (ref->f) {
if ((ref->poc & mask) == poc && (use_msb || ref->poc != s->poc))
return ref;
}
}
if (s->nal_unit_type != HEVC_NAL_CRA_NUT && !IS_BLA(s))
av_log(s->avctx, AV_LOG_ERROR,
"Could not find ref with POC %d\n", poc);
return NULL;
}
static void mark_ref(HEVCFrame *frame, int flag)
{
frame->flags &= ~(HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF);
frame->flags |= flag;
}
static HEVCFrame *generate_missing_ref(HEVCContext *s, HEVCLayerContext *l, int poc)
{
HEVCFrame *frame;
int i, y;
frame = alloc_frame(s, l);
if (!frame)
return NULL;
if (!s->avctx->hwaccel) {
if (!l->sps->pixel_shift) {
for (i = 0; frame->f->data[i]; i++)
memset(frame->f->data[i], 1 << (l->sps->bit_depth - 1),
frame->f->linesize[i] * AV_CEIL_RSHIFT(l->sps->height, l->sps->vshift[i]));
} else {
for (i = 0; frame->f->data[i]; i++)
for (y = 0; y < (l->sps->height >> l->sps->vshift[i]); y++) {
uint8_t *dst = frame->f->data[i] + y * frame->f->linesize[i];
AV_WN16(dst, 1 << (l->sps->bit_depth - 1));
av_memcpy_backptr(dst + 2, 2, 2*(l->sps->width >> l->sps->hshift[i]) - 2);
}
}
}
frame->poc = poc;
frame->flags = HEVC_FRAME_FLAG_UNAVAILABLE;
if (s->avctx->active_thread_type == FF_THREAD_FRAME)
ff_progress_frame_report(&frame->tf, INT_MAX);
return frame;
}
/* add a reference with the given poc to the list and mark it as used in DPB */
static int add_candidate_ref(HEVCContext *s, HEVCLayerContext *l,
RefPicList *list,
int poc, int ref_flag, uint8_t use_msb)
{
HEVCFrame *ref = find_ref_idx(s, l, poc, use_msb);
if (ref == s->cur_frame || list->nb_refs >= HEVC_MAX_REFS)
return AVERROR_INVALIDDATA;
if (!ref) {
ref = generate_missing_ref(s, l, poc);
if (!ref)
return AVERROR(ENOMEM);
}
list->list[list->nb_refs] = ref->poc;
list->ref[list->nb_refs] = ref;
list->nb_refs++;
mark_ref(ref, ref_flag);
return 0;
}
int ff_hevc_frame_rps(HEVCContext *s, HEVCLayerContext *l)
{
const ShortTermRPS *short_rps = s->sh.short_term_rps;
const LongTermRPS *long_rps = &s->sh.long_term_rps;
RefPicList *rps = s->rps;
int i, ret = 0;
unref_missing_refs(l);
/* clear the reference flags on all frames except the current one */
for (i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++) {
HEVCFrame *frame = &l->DPB[i];
if (frame == s->cur_frame)
continue;
mark_ref(frame, 0);
}
for (i = 0; i < NB_RPS_TYPE; i++)
rps[i].nb_refs = 0;
if (!short_rps)
goto inter_layer;
/* add the short refs */
for (i = 0; i < short_rps->num_delta_pocs; i++) {
int poc = s->poc + short_rps->delta_poc[i];
int list;
if (!(short_rps->used & (1 << i)))
list = ST_FOLL;
else if (i < short_rps->num_negative_pics)
list = ST_CURR_BEF;
else
list = ST_CURR_AFT;
ret = add_candidate_ref(s, l, &rps[list], poc,
HEVC_FRAME_FLAG_SHORT_REF, 1);
if (ret < 0)
goto fail;
}
/* add the long refs */
for (i = 0; i < long_rps->nb_refs; i++) {
int poc = long_rps->poc[i];
int list = long_rps->used[i] ? LT_CURR : LT_FOLL;
ret = add_candidate_ref(s, l, &rps[list], poc,
HEVC_FRAME_FLAG_LONG_REF, long_rps->poc_msb_present[i]);
if (ret < 0)
goto fail;
}
inter_layer:
/* add inter-layer refs */
if (s->sh.inter_layer_pred) {
HEVCLayerContext *l0 = &s->layers[0];
av_assert0(l != l0);
/* Given the assumption of at most two layers, refPicSet0Flag is
* always 1, so only RefPicSetInterLayer0 can ever contain a frame. */
if (l0->cur_frame) {
// inter-layer refs are treated as short-term here, cf. F.8.1.6
ret = add_candidate_ref(s, l0, &rps[INTER_LAYER0], l0->cur_frame->poc,
HEVC_FRAME_FLAG_SHORT_REF, 1);
if (ret < 0)
goto fail;
}
}
fail:
/* release any frames that are now unused */
for (i = 0; i < FF_ARRAY_ELEMS(l->DPB); i++)
ff_hevc_unref_frame(&l->DPB[i], 0);
return ret;
}
int ff_hevc_frame_nb_refs(const SliceHeader *sh, const HEVCPPS *pps,
unsigned layer_idx)
{
int ret = 0;
int i;
const ShortTermRPS *rps = sh->short_term_rps;
const LongTermRPS *long_rps = &sh->long_term_rps;
if (rps) {
for (i = 0; i < rps->num_negative_pics; i++)
ret += !!(rps->used & (1 << i));
for (; i < rps->num_delta_pocs; i++)
ret += !!(rps->used & (1 << i));
}
if (long_rps) {
for (i = 0; i < long_rps->nb_refs; i++)
ret += !!long_rps->used[i];
}
if (sh->inter_layer_pred) {
av_assert0(pps->sps->vps->num_direct_ref_layers[layer_idx] < 2);
ret++;
}
if (pps->pps_curr_pic_ref_enabled_flag)
ret++;
return ret;
}
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