x265-1.7版本-common/framedata.cpp注释

x265编码器帧数据管理

最新推荐文章于 2023-11-08 08:54:19 发布

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本文介绍x265编码器中帧数据管理的具体实现，包括帧数据的初始化、内存分配与释放等关键步骤。重点讲解了CTU（Coding Tree Unit）的数据结构及其在帧中的布局方式。

注：问号以及未注释部分会在x265-1.8版本内更新

/*****************************************************************************
* Copyright (C) 2013 x265 project
*
* Author: 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 "framedata.h"
#include "picyuv.h"

using namespace x265;
/** 函数功能    ：初始化
/*  调用范围    ：只在Frame::allocEncodeData函数中被调用
*/
FrameData::FrameData()
{
    memset(this, 0, sizeof(*this));
}
/** 函数功能    ：申请一帧CTU的存储空间，初始化CTU、初始化统计信息
/*  调用范围    ：只在Frame::allocEncodeData函数中被调用
* \返回值       ：申请空间成功为ture，否则为false
*/
bool FrameData::create(x265_param *param, const SPS& sps)
{
    m_param = param;    //获取配置参数
    m_slice  = new Slice;//实例化
    m_picCTU = new CUData[sps.numCUsInFrame];//申请一帧CTU个数的空间

    m_cuMemPool.create(0, param->internalCsp, sps.numCUsInFrame);//申请CTU内存空间
    for (uint32_t ctuAddr = 0; ctuAddr < sps.numCUsInFrame; ctuAddr++)
        m_picCTU[ctuAddr].initialize(m_cuMemPool, 0, param->internalCsp, ctuAddr);//初始化函数指针，获取CTU数据相应存储位置

    CHECKED_MALLOC(m_cuStat, RCStatCU, sps.numCUsInFrame);
    CHECKED_MALLOC(m_rowStat, RCStatRow, sps.numCuInHeight);
    reinit(sps);//初始化统计信息
    return true;

fail:
    return false;
}
/** 函数功能    ：初始化统计信息为0
/*  调用范围    ：只在FrameData::create和Frame::reinit函数中被调用
* \返回值       ：null
*/
void FrameData::reinit(const SPS& sps)
{
    memset(m_cuStat, 0, sps.numCUsInFrame * sizeof(*m_cuStat));
    memset(m_rowStat, 0, sps.numCuInHeight * sizeof(*m_rowStat));
}
/** 函数功能    ：释放内存
/*  调用范围    ：只在Frame::destroy()和DPB::~DPB()函数中被调用
*/
void FrameData::destroy()
{
    delete [] m_picCTU;
    delete m_slice;
    delete m_saoParam;

    m_cuMemPool.destroy();

    X265_FREE(m_cuStat);
    X265_FREE(m_rowStat);
}