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/*
* Copyright (C) 2010-2017 Hendrik Leppkes
* http://www.1f0.de
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "stdafx.h"
#include "HEVCSequenceParser.h"
#include "H264Nalu.h"
#define HEVC_NAL_VPS 32
#define HEVC_NAL_SPS 33
#define HEVC_NAL_PPS 34
CHEVCSequenceParser::CHEVCSequenceParser()
{
ZeroMemory(&sps, sizeof(sps));
}
CHEVCSequenceParser::~CHEVCSequenceParser()
{
}
HRESULT CHEVCSequenceParser::ParseNALs(const BYTE *buffer, size_t buflen, int nal_size)
{
CH265Nalu nalu;
nalu.SetBuffer(buffer, buflen, nal_size);
while (nalu.ReadNext()) {
const BYTE *data = nalu.GetDataBuffer() + 2;
const size_t len = nalu.GetDataLength() - 2;
if (nalu.GetType() == HEVC_NAL_SPS) {
ParseSPS(data, len);
break;
}
}
return S_OK;
}
HRESULT CHEVCSequenceParser::ParseSPS(const BYTE *buffer, size_t buflen)
{
CByteParser parser(buffer, buflen);
int i;
ZeroMemory(&sps, sizeof(sps));
sps.valid = 1;
parser.BitRead(4); // sps_video_parameter_set_id
int max_sub_layers = parser.BitRead(3); // sps_max_sub_layers_minus1
parser.BitRead(1); // sps_temporal_id_nesting_flag
// profile tier level
parser.BitRead(2); // general_profile_space
parser.BitRead(1); // general_tier_flag
sps.profile = parser.BitRead(5); // general_profile_idc
parser.BitRead(32); // general_profile_compatibility_flag[32]
parser.BitRead(1); // general_progressive_source_flag
parser.BitRead(1); // general_interlaced_source_flag
parser.BitRead(1); // general_non_packed_constraint_flag
parser.BitRead(1); // general_frame_only_constraint_flag
parser.BitRead(22); // general_reserved_zero_44bits
parser.BitRead(22); // general_reserved_zero_44bits
sps.level = parser.BitRead(8); // general_level_idc
for (i = 0; i < max_sub_layers; i++) {
parser.BitRead(1); // sub_layer_profile_present_flag
parser.BitRead(1); // sub_layer_level_present_flag
}
if (max_sub_layers > 0) {
for (i = max_sub_layers; i < 8; i++)
parser.BitRead(2); // reserved_zero_2bits
}
return S_OK;
}
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