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/*
* HEVC Parameter Set encoding
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "golomb.h"
#include "hevc.h"
#include "put_bits.h"
static void write_ptl_layer(PutBitContext *pb, PTLCommon *ptl)
{
int i;
put_bits(pb, 2, ptl->profile_space);
put_bits(pb, 1, ptl->tier_flag);
put_bits(pb, 5, ptl->profile_idc);
for (i = 0; i < 32; i++)
put_bits(pb, 1, ptl->profile_compatibility_flag[i]);
put_bits(pb, 1, ptl->progressive_source_flag);
put_bits(pb, 1, ptl->interlaced_source_flag);
put_bits(pb, 1, ptl->non_packed_constraint_flag);
put_bits(pb, 1, ptl->frame_only_constraint_flag);
put_bits32(pb, 0); // reserved
put_bits(pb, 12, 0); // reserved
}
static void write_ptl(PutBitContext *pb, PTL *ptl, int max_num_sub_layers)
{
int i;
write_ptl_layer(pb, &ptl->general_ptl);
put_bits(pb, 8, ptl->general_ptl.level_idc);
for (i = 0; i < max_num_sub_layers - 1; i++) {
put_bits(pb, 1, ptl->sub_layer_profile_present_flag[i]);
put_bits(pb, 1, ptl->sub_layer_level_present_flag[i]);
}
if (max_num_sub_layers > 1)
for (i = max_num_sub_layers - 1; i < 8; i++)
put_bits(pb, 2, 0); // reserved
for (i = 0; i < max_num_sub_layers - 1; i++) {
if (ptl->sub_layer_profile_present_flag[i])
write_ptl_layer(pb, &ptl->sub_layer_ptl[i]);
if (ptl->sub_layer_level_present_flag[i])
put_bits(pb, 8, ptl->sub_layer_ptl[i].level_idc);
}
}
int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int id,
uint8_t *buf, int buf_size)
{
PutBitContext pb;
int i;
init_put_bits(&pb, buf, buf_size);
put_bits(&pb, 4, id);
put_bits(&pb, 2, 3); // reserved
put_bits(&pb, 6, vps->vps_max_layers - 1);
put_bits(&pb, 3, vps->vps_max_sub_layers - 1);
put_bits(&pb, 1, vps->vps_temporal_id_nesting_flag);
put_bits(&pb, 16, 0xffff); // reserved
write_ptl(&pb, &vps->ptl, vps->vps_max_sub_layers);
put_bits(&pb, 1, vps->vps_sub_layer_ordering_info_present_flag);
for (i = vps->vps_sub_layer_ordering_info_present_flag ? 0 : vps->vps_max_layers - 1;
i < vps->vps_max_sub_layers; i++) {
set_ue_golomb(&pb, vps->vps_max_dec_pic_buffering[i] - 1);
set_ue_golomb(&pb, vps->vps_num_reorder_pics[i]);
set_ue_golomb(&pb, vps->vps_max_latency_increase[i] + 1);
}
put_bits(&pb, 6, vps->vps_max_layer_id);
set_ue_golomb(&pb, vps->vps_num_layer_sets - 1);
// writing layer_id_included_flag not supported
if (vps->vps_num_layer_sets > 1)
return AVERROR_PATCHWELCOME;
put_bits(&pb, 1, vps->vps_timing_info_present_flag);
if (vps->vps_timing_info_present_flag) {
put_bits32(&pb, vps->vps_num_units_in_tick);
put_bits32(&pb, vps->vps_time_scale);
put_bits(&pb, 1, vps->vps_poc_proportional_to_timing_flag);
if (vps->vps_poc_proportional_to_timing_flag)
set_ue_golomb(&pb, vps->vps_num_ticks_poc_diff_one - 1);
// writing HRD parameters not supported
if (vps->vps_num_hrd_parameters)
return AVERROR_PATCHWELCOME;
}
put_bits(&pb, 1, 0); // extension flag
put_bits(&pb, 1, 1); // stop bit
avpriv_align_put_bits(&pb);
return put_bits_count(&pb) / 8;
}
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