/*****************************************************************************

 * Copyright (C) 2013-2020 MulticoreWare, Inc

 *

 * Authors: Gopu Govindaswamy <gopu@multicorewareinc.com>

 *

 * 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 "piclist.h"

#include "frame.h"

using namespace X265_NS;

void PicList::pushFront(Frame& curFrame)

{

    X265_CHECK(!curFrame.m_next && !curFrame.m_prev, "piclist: picture already in list\n"); // ensure frame is not in a list

    curFrame.m_next = m_start;

    curFrame.m_prev = NULL;

    if (m_count)

    {

        m_start->m_prev = &curFrame;

        m_start = &curFrame;

    }

    else

    {

        m_start = m_end = &curFrame;

    }

    m_count++;

}

void PicList::pushBack(Frame& curFrame)

{

    X265_CHECK(!curFrame.m_next && !curFrame.m_prev, "piclist: picture already in list\n"); // ensure frame is not in a list

    curFrame.m_next = NULL;

    curFrame.m_prev = m_end;

    if (m_count)

    {

        m_end->m_next = &curFrame;

        m_end = &curFrame;

    }

    else

    {

        m_start = m_end = &curFrame;

    }

    m_count++;

}

Frame *PicList::popFront()

{

    if (m_start)

    {

        Frame *temp = m_start;

        m_count--;

        if (m_count)

        {

            m_start = m_start->m_next;

            m_start->m_prev = NULL;

        }

        else

        {

            m_start = m_end = NULL;

        }

        temp->m_next = temp->m_prev = NULL;

        return temp;

    }

    else

        return NULL;

}

Frame* PicList::getPOC(int poc)

{

    Frame *curFrame = m_start;

    while (curFrame && curFrame->m_poc != poc)

        curFrame = curFrame->m_next;

    return curFrame;

}

Frame *PicList::popBack()

{

    if (m_end)

    {

        Frame* temp = m_end;

        m_count--;

        if (m_count)

        {

            m_end = m_end->m_prev;

            m_end->m_next = NULL;

        }

        else

        {

            m_start = m_end = NULL;

        }

        temp->m_next = temp->m_prev = NULL;

        return temp;

    }

    else

        return NULL;

}

Frame* PicList::getCurFrame(void)

{

    Frame *curFrame = m_start;

    if (curFrame != NULL)

        return curFrame;

    else

        return NULL;

}

void PicList::remove(Frame& curFrame)

{

#if _DEBUG

    Frame *tmp = m_start;

    while (tmp && tmp != &curFrame)

    {

        tmp = tmp->m_next;

    }

    X265_CHECK(tmp == &curFrame, "piclist: pic being removed was not in list\n"); // verify pic is in this list

#endif

    m_count--;

    if (m_count)

    {

        if (m_start == &curFrame)

            m_start = curFrame.m_next;

        if (m_end == &curFrame)

            m_end = curFrame.m_prev;

        if (curFrame.m_next)

            curFrame.m_next->m_prev = curFrame.m_prev;

        if (curFrame.m_prev)

            curFrame.m_prev->m_next = curFrame.m_next;

    }

    else

    {

        m_start = m_end = NULL;

    }

    curFrame.m_next = curFrame.m_prev = NULL;

}