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/*****************************************************************************
* Copyright (C) 2013-2020 MulticoreWare, Inc
*
* Authors: Steve Borho <steve@borho.org>
*
* 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 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at license @ x265.com.
*****************************************************************************/
#include "common.h"
#include "bitstream.h"
#include "slice.h"
#include "sei.h"
using namespace X265_NS;
/* x265's identifying GUID */
const uint8_t SEIuserDataUnregistered::m_uuid_iso_iec_11578[16] = {
0x2C, 0xA2, 0xDE, 0x09, 0xB5, 0x17, 0x47, 0xDB,
0xBB, 0x55, 0xA4, 0xFE, 0x7F, 0xC2, 0xFC, 0x4E
};
/* marshal a single SEI message sei, storing the marshalled representation
* in bitstream bs */
void SEI::writeSEImessages(Bitstream& bs, const SPS& sps, NalUnitType nalUnitType, NALList& list, int isNested, int layer)
{
if (!isNested)
bs.resetBits();
BitCounter counter;
m_bitIf = &counter;
writeSEI(sps);
/* count the size of the payload and return the size in bits */
X265_CHECK(0 == (counter.getNumberOfWrittenBits() & 7), "payload unaligned\n");
uint32_t payloadData = counter.getNumberOfWrittenBits() >> 3;
// set bitstream
m_bitIf = &bs;
uint32_t payloadType = m_payloadType;
for (; payloadType >= 0xff; payloadType -= 0xff)
WRITE_CODE(0xff, 8, "payload_type");
WRITE_CODE(payloadType, 8, "payload_type");
uint32_t payloadSize = payloadData;
for (; payloadSize >= 0xff; payloadSize -= 0xff)
WRITE_CODE(0xff, 8, "payload_size");
WRITE_CODE(payloadSize, 8, "payload_size");
// virtual writeSEI method, write to bs
writeSEI(sps);
if (!isNested)
{
if (nalUnitType != NAL_UNIT_UNSPECIFIED)
bs.writeByteAlignment();
list.serialize(nalUnitType, bs, layer, (1 + (nalUnitType == NAL_UNIT_CODED_SLICE_TSA_N)));
}
}
void SEI::writeByteAlign()
{
// TODO: expose bs.writeByteAlignment() as virtual function
if (m_bitIf->getNumberOfWrittenBits() % 8 != 0)
{
WRITE_FLAG(1, "bit_equal_to_one");
while (m_bitIf->getNumberOfWrittenBits() % 8 != 0)
{
WRITE_FLAG(0, "bit_equal_to_zero");
}
}
}
void SEI::setSize(uint32_t size)
{
m_payloadSize = size;
}
/* charSet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" */
char* SEI::base64Decode(char encodedString[], int base64EncodeLength, char* decodedString)
{
int i, j, k = 0;
// stores the bitstream
int bitstream = 0;
// countBits stores the current number of bits in bitstream
int countBits = 0;
for (i = 0; i < base64EncodeLength; i += 4)
{
bitstream = 0;
countBits = 0;
for (j = 0; j < 4; j++)
{
if (encodedString[i + j] != '=')
{
int value = 0;
if (encodedString[i + j] >= 'A' && encodedString[i + j] <= 'Z')
value = encodedString[i + j] - 'A';
else if (encodedString[i + j] >= 'a' && encodedString[i + j] <= 'z')
value = encodedString[i + j] - 'a' + 26;
else if (encodedString[i + j] >= '0' && encodedString[i + j] <= '9')
value = encodedString[i + j] - '0' + 52;
else if (encodedString[i + j] == '+')
value = 62;
else if (encodedString[i + j] == '/')
value = 63;
else
value = 0;
bitstream = (bitstream << 6) | value;
countBits += 6;
}
}
while (countBits >= 8)
{
countBits -= 8;
decodedString[k++] = (bitstream >> countBits) & 0xFF;
}
}
if (k < base64EncodeLength)
{
decodedString[k] = '\0';
}
return decodedString;
}
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