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libbpg-0.9.3

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King_DuckZ 2015-01-16 13:46:18 +01:00
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jctvc/TLibEncoder/AnnexBwrite.h Normal file
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/* The copyright in this software is being made available under the BSD
* License, included below. This software may be subject to other third party
* and contributor rights, including patent rights, and no such rights are
* granted under this license.
*
* Copyright (c) 2010-2014, ITU/ISO/IEC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#ifndef __ANNEXBWRITE__
#define __ANNEXBWRITE__
#include <ostream>
#include "TLibCommon/AccessUnit.h"
#include "NALwrite.h"
//! \ingroup TLibEncoder
//! \{
/**
* write all NALunits in au to bytestream out in a manner satisfying
* AnnexB of AVC. NALunits are written in the order they are found in au.
* the zero_byte word is appended to:
* - the initial startcode in the access unit,
* - any SPS/PPS nal units
*/
static std::vector<UInt> writeAnnexB(std::ostream& out, const AccessUnit& au)
{
std::vector<UInt> annexBsizes;
for (AccessUnit::const_iterator it = au.begin(); it != au.end(); it++)
{
const NALUnitEBSP& nalu = **it;
UInt size = 0; /* size of annexB unit in bytes */
static const Char start_code_prefix[] = {0,0,0,1};
if (it == au.begin() || nalu.m_nalUnitType == NAL_UNIT_VPS || nalu.m_nalUnitType == NAL_UNIT_SPS || nalu.m_nalUnitType == NAL_UNIT_PPS)
{
/* From AVC, When any of the following conditions are fulfilled, the
* zero_byte syntax element shall be present:
* - the nal_unit_type within the nal_unit() is equal to 7 (sequence
* parameter set) or 8 (picture parameter set),
* - the byte stream NAL unit syntax structure contains the first NAL
* unit of an access unit in decoding order, as specified by subclause
* 7.4.1.2.3.
*/
out.write(start_code_prefix, 4);
size += 4;
}
else
{
out.write(start_code_prefix+1, 3);
size += 3;
}
out << nalu.m_nalUnitData.str();
size += UInt(nalu.m_nalUnitData.str().size());
annexBsizes.push_back(size);
}
return annexBsizes;
}
//! \}
#endif