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/*
* 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/common.h"
#include "libavutil/opt.h"
#include "bsf.h"
#include "bsf_internal.h"
#include "cbs.h"
#include "cbs_bsf.h"
#include "cbs_h266.h"
#include "vvc.h"
#define IS_H266_SLICE(nut) (nut <= VVC_RASL_NUT || (nut >= VVC_IDR_W_RADL && nut <= VVC_GDR_NUT))
typedef struct H266MetadataContext {
CBSBSFContext common;
H266RawAUD aud_nal;
int aud;
} H266MetadataContext;
static int h266_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
CodedBitstreamFragment *pu)
{
H266MetadataContext *ctx = bsf->priv_data;
int err, i;
// If an AUD is present, it must be the first NAL unit.
if (pu->units[0].type == VVC_AUD_NUT) {
if (ctx->aud == BSF_ELEMENT_REMOVE)
ff_cbs_delete_unit(pu, 0);
} else if ( pkt && ctx->aud == BSF_ELEMENT_INSERT) {
const H266RawSlice *first_slice = NULL;
const H266RawPictureHeader *ph = NULL;
H266RawAUD *aud = &ctx->aud_nal;
int pic_type = 0, temporal_id = 8, layer_id = 0;
for (i = 0; i < pu->nb_units; i++) {
const H266RawNALUnitHeader *nal = pu->units[i].content;
if (!nal)
continue;
if (nal->nuh_temporal_id_plus1 < temporal_id + 1)
temporal_id = nal->nuh_temporal_id_plus1 - 1;
if ( nal->nal_unit_type == VVC_PH_NUT ) {
const H266RawPH *header = pu->units[i].content;
ph = &header->ph_picture_header;
} else if (IS_H266_SLICE(nal->nal_unit_type)) {
const H266RawSlice *slice = pu->units[i].content;
layer_id = nal->nuh_layer_id;
if (slice->header.sh_slice_type == VVC_SLICE_TYPE_B &&
pic_type < 2)
pic_type = 2;
if (slice->header.sh_slice_type == VVC_SLICE_TYPE_P &&
pic_type < 1)
pic_type = 1;
if (!first_slice) {
first_slice = slice;
if (first_slice->header.
sh_picture_header_in_slice_header_flag)
ph = &first_slice->header.sh_picture_header;
else if (!ph)
break;
}
}
}
if (!ph) {
av_log(bsf, AV_LOG_ERROR, "no avaliable picture header");
return AVERROR_INVALIDDATA;
}
aud->nal_unit_header = (H266RawNALUnitHeader) {
.nal_unit_type = VVC_AUD_NUT,
.nuh_layer_id = layer_id,
.nuh_temporal_id_plus1 = temporal_id + 1,
};
aud->aud_pic_type = pic_type;
aud->aud_irap_or_gdr_flag = ph->ph_gdr_or_irap_pic_flag;
err = ff_cbs_insert_unit_content(pu, 0, VVC_AUD_NUT, aud, NULL);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to insert AUD.\n");
return err;
}
}
/* TODO: implement more metadata parsing, like VUI, Levels etc. */
//for (i = 0; i < pu->nb_units; i++) {
// if (pu->units[i].type == VVC_SPS_NUT) {
// }
//}
return 0;
}
static const CBSBSFType h266_metadata_type = {
.codec_id = AV_CODEC_ID_VVC,
.fragment_name = "access unit",
.unit_name = "NAL unit",
.update_fragment = &h266_metadata_update_fragment,
};
static int h266_metadata_init(AVBSFContext *bsf)
{
return ff_cbs_bsf_generic_init(bsf, &h266_metadata_type);
}
#define OFFSET(x) offsetof(H266MetadataContext, x)
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
static const AVOption h266_metadata_options[] = {
BSF_ELEMENT_OPTIONS_PIR("aud", "Access Unit Delimiter NAL units",
aud, FLAGS),
{ NULL }
};
static const AVClass h266_metadata_class = {
.class_name = "h266_metadata_bsf",
.item_name = av_default_item_name,
.option = h266_metadata_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const enum AVCodecID h266_metadata_codec_ids[] = {
AV_CODEC_ID_VVC, AV_CODEC_ID_NONE,
};
const FFBitStreamFilter ff_vvc_metadata_bsf = {
.p.name = "vvc_metadata",
.p.codec_ids = h266_metadata_codec_ids,
.p.priv_class = &h266_metadata_class,
.priv_data_size = sizeof(H266MetadataContext),
.init = &h266_metadata_init,
.close = &ff_cbs_bsf_generic_close,
.filter = &ff_cbs_bsf_generic_filter,
};
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