/*
* 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/pixdesc.h"
#include "hevc.h"
#include "internal.h"
#include "thread.h"
void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *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) {
ff_thread_release_buffer(s->avctx, &frame->tf);
av_buffer_unref(&frame->tab_mvf_buf);
frame->tab_mvf = NULL;
av_buffer_unref(&frame->rpl_buf);
av_buffer_unref(&frame->rpl_tab_buf);
frame->rpl_tab = NULL;
frame->refPicList = NULL;
frame->collocated_ref = NULL;
}
}
RefPicList* ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0)
{
if (x0 < 0 || y0 < 0) {
return s->ref->refPicList;
} else {
int x_cb = x0 >> s->sps->log2_ctb_size;
int y_cb = y0 >> s->sps->log2_ctb_size;
int pic_width_cb = (s->sps->width + (1<<s->sps->log2_ctb_size)-1 ) >> s->sps->log2_ctb_size;
int ctb_addr_ts = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
return (RefPicList*) ref->rpl_tab[ctb_addr_ts];
}
}
void ff_hevc_clear_refs(HEVCContext *s)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
ff_hevc_unref_frame(s, &s->DPB[i],
HEVC_FRAME_FLAG_SHORT_REF | HEVC_FRAME_FLAG_LONG_REF);
}
void ff_hevc_flush_dpb(HEVCContext *s)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
ff_hevc_unref_frame(s, &s->DPB[i], ~0);
}
static HEVCFrame *alloc_frame(HEVCContext *s)
{
int i, j, ret;
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
HEVCFrame *frame = &s->DPB[i];
if (frame->frame->buf[0])
continue;
ret = ff_thread_get_buffer(s->avctx, &frame->tf, AV_GET_BUFFER_FLAG_REF);
if (ret < 0)
return NULL;
frame->rpl_buf = av_buffer_allocz(s->nb_nals * sizeof(RefPicListTab));
if (!frame->rpl_buf)
goto fail;
frame->tab_mvf_buf = av_buffer_pool_get(s->tab_mvf_pool);
if (!frame->tab_mvf_buf)
goto fail;
frame->tab_mvf = (MvField*)frame->tab_mvf_buf->data;
frame->rpl_tab_buf = av_buffer_pool_get(s->rpl_tab_pool);
if (!frame->rpl_tab_buf)
goto fail;
frame->rpl_tab = (RefPicListTab**)frame->rpl_tab_buf->data;
frame->ctb_count = s->sps->ctb_width * s->sps->ctb_height;
for (j = 0; j < frame->ctb_count; j++)
frame->rpl_tab[j] = (RefPicListTab*)frame->rpl_buf->data;
return frame;
fail:
ff_hevc_unref_frame(s, 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, AVFrame **frame, int poc)
{
HEVCFrame *ref;
int i;
/* check that this POC doesn't already exist */
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
HEVCFrame *frame = &s->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);
if (!ref)
return AVERROR(ENOMEM);
*frame = ref->frame;
s->ref = ref;
ref->poc = poc;
ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
ref->sequence = s->seq_decode;
ref->window = s->sps->output_window;
return 0;
}
int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
{
do {
int nb_output = 0;
int min_poc = INT_MAX;
int i, j, min_idx, ret;
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
HEVCFrame *frame = &s->DPB[i];
if ((frame->flags & HEVC_FRAME_FLAG_OUTPUT) &&
frame->sequence == s->seq_output) {
nb_output++;
if (frame->poc < min_poc) {
min_poc = frame->poc;
min_idx = i;
}
}
}
/* wait for more frames before output */
if (!flush && s->seq_output == s->seq_decode && s->sps &&
nb_output <= s->sps->temporal_layer[s->sps->max_sub_layers - 1].num_reorder_pics)
return 0;
if (nb_output) {
HEVCFrame *frame = &s->DPB[min_idx];
AVFrame *dst = out;
AVFrame *src = frame->frame;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format);
int pixel_shift = !!(desc->comp[0].depth_minus1 > 7);
ret = av_frame_ref(out, src);
ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT);
if (ret < 0)
return ret;
for (j = 0; j < 3; j++) {
int hshift = (j > 0) ? desc->log2_chroma_w : 0;
int vshift = (j > 0) ? desc->log2_chroma_h : 0;
int off = ((frame->window.left_offset >> hshift) << pixel_shift) +
(frame->window.top_offset >> vshift) * dst->linesize[j];
dst->data[j] += off;
}
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;
}
static int init_slice_rpl(HEVCContext *s)
{
HEVCFrame *frame = s->ref;
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->rpl_buf->size / sizeof(RefPicListTab))
return AVERROR_INVALIDDATA;
for (i = ctb_addr_ts; i < ctb_count; i++)
frame->rpl_tab[i] = (RefPicListTab*)frame->rpl_buf->data + 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 == B_SLICE ? 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)) {
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->ref->refPicList[list_idx];
/* The order of the elements is
* ST_CURR_BEF - ST_CURR_AFT - LT_CURR for the L0 and
* ST_CURR_AFT - ST_CURR_BEF - LT_CURR for the L1
*/
int cand_lists[3] = { list_idx ? ST_CURR_AFT : ST_CURR_BEF,
list_idx ? ST_CURR_BEF : ST_CURR_AFT,
LT_CURR };
/* 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 < MAX_REFS; j++) {
rpl_tmp.list[rpl_tmp.nb_refs] = rps->list[j];
rpl_tmp.ref[rpl_tmp.nb_refs] = rps->ref[j];
rpl_tmp.isLongTerm[rpl_tmp.nb_refs] = (i == 2);
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]);
}
if (sh->collocated_list == list_idx &&
sh->collocated_ref_idx < rpl->nb_refs)
s->ref->collocated_ref = rpl->ref[sh->collocated_ref_idx];
}
return 0;
}
static HEVCFrame *find_ref_idx(HEVCContext *s, int poc)
{
int i;
int LtMask = (1 << s->sps->log2_max_poc_lsb) - 1;
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
HEVCFrame *ref = &s->DPB[i];
if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
if ((ref->poc & LtMask) == poc)
return ref;
}
}
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
HEVCFrame *ref = &s->DPB[i];
if (ref->frame->buf[0] && (ref->sequence == s->seq_decode)) {
if (ref->poc == poc || (ref->poc & LtMask) == poc)
return ref;
}
}
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, int poc)
{
HEVCFrame *frame;
int i, x, y;
frame = alloc_frame(s);
if (!frame)
return NULL;
if (!s->sps->pixel_shift) {
for (i = 0; frame->frame->buf[i]; i++)
memset(frame
->frame
->buf
[i
]->data
, 1 << (s
->sps
->bit_depth
- 1), frame->frame->buf[i]->size);
} else {
for (i = 0; frame->frame->data[i]; i++)
for (y = 0; y < (s->sps->height >> s->sps->vshift[i]); y++)
for (x = 0; x < (s->sps->width >> s->sps->hshift[i]); x++) {
AV_WN16(frame->frame->data[i] + y * frame->frame->linesize[i] + 2 * x,
1 << (s->sps->bit_depth - 1));
}
}
frame->poc = poc;
frame->sequence = s->seq_decode;
frame->flags = 0;
if (s->threads_type == FF_THREAD_FRAME)
ff_thread_report_progress(&frame->tf, INT_MAX, 0);
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, RefPicList *list,
int poc, int ref_flag)
{
HEVCFrame *ref = find_ref_idx(s, poc);
if (ref == s->ref)
return AVERROR_INVALIDDATA;
if (!ref) {
ref = generate_missing_ref(s, 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)
{
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;
if (!short_rps) {
rps[0].nb_refs = rps[1].nb_refs = 0;
return 0;
}
/* clear the reference flags on all frames except the current one */
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++) {
HEVCFrame *frame = &s->DPB[i];
if (frame == s->ref)
continue;
mark_ref(frame, 0);
}
for (i = 0; i < NB_RPS_TYPE; i++)
rps[i].nb_refs = 0;
/* 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[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, &rps[list], poc, HEVC_FRAME_FLAG_SHORT_REF);
if (ret < 0)
return ret;
}
/* 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, &rps[list], poc, HEVC_FRAME_FLAG_LONG_REF);
if (ret < 0)
return ret;
}
/* release any frames that are now unused */
for (i = 0; i < FF_ARRAY_ELEMS(s->DPB); i++)
ff_hevc_unref_frame(s, &s->DPB[i], 0);
return 0;
}
int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb)
{
int max_poc_lsb = 1 << s->sps->log2_max_poc_lsb;
int prev_poc_lsb = s->pocTid0 % max_poc_lsb;
int prev_poc_msb = s->pocTid0 - prev_poc_lsb;
int poc_msb;
if ((poc_lsb < prev_poc_lsb) && ((prev_poc_lsb - poc_lsb) >= max_poc_lsb / 2))
poc_msb = prev_poc_msb + max_poc_lsb;
else if ((poc_lsb > prev_poc_lsb) && ((poc_lsb - prev_poc_lsb) > (max_poc_lsb / 2)))
poc_msb = prev_poc_msb - max_poc_lsb;
else
poc_msb = prev_poc_msb;
// For BLA picture types, POCmsb is set to 0.
if (s->nal_unit_type == NAL_BLA_W_LP ||
s->nal_unit_type == NAL_BLA_W_RADL ||
s->nal_unit_type == NAL_BLA_N_LP)
poc_msb = 0;
return poc_msb + poc_lsb;
}
int ff_hevc_frame_nb_refs(HEVCContext *s)
{
int ret = 0;
int i;
const ShortTermRPS *rps = s->sh.short_term_rps;
LongTermRPS *long_rps = &s->sh.long_term_rps;
if (rps) {
for (i = 0; i < rps->num_negative_pics; i++)
ret += !!rps->used[i];
for (; i < rps->num_delta_pocs; i++)
ret += !!rps->used[i];
}
if (long_rps) {
for (i = 0; i < long_rps->nb_refs; i++)
ret += !!long_rps->used[i];
}
return ret;
}