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

 *

 * Copyright (C) 2015 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at:

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 *

 *****************************************************************************

 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore

*/

/**

*******************************************************************************

* @file

*  impeg2_disp_mgr.c

*

* @brief

*  Contains function definitions for display management

*

* @author

*  Srinivas T

*

* @par List of Functions:

*   - impeg2_disp_mgr_init()

*   - impeg2_disp_mgr_add()

*   - impeg2_disp_mgr_get()

*

* @remarks

*  None

*

*******************************************************************************

*/

#include <stdio.h>

#include <stdlib.h>

#include "iv_datatypedef.h"

#include "impeg2_defs.h"

#include "impeg2_disp_mgr.h"

/**

*******************************************************************************

*

* @brief

*    Initialization function for display buffer manager

*

* @par Description:

*    Initializes the display buffer management structure

*

* @param[in] ps_disp_mgr

*  Pointer to the display buffer management structure

*

* @returns none

*

* @remarks

*  None

*

*******************************************************************************

*/

void impeg2_disp_mgr_init(

                disp_mgr_t *ps_disp_mgr)

{

    WORD32 id;

    for(id = 0; id < DISP_MGR_MAX_CNT; id++)

    {

        ps_disp_mgr->apv_ptr[id] = NULL;

    }

    ps_disp_mgr->i4_wr_idx = 0;

    ps_disp_mgr->i4_rd_idx = 0;

}

/**

*******************************************************************************

*

* @brief

*     Adds a buffer to the display manager

*

* @par Description:

*      Adds a buffer to the display buffer manager

*

* @param[in] ps_disp_mgr

*  Pointer to the diaplay buffer management structure

*

* @param[in] buf_id

*  ID of the display buffer

*

* @param[in] abs_poc

*  Absolute POC of the display buffer

*

* @param[in] pv_ptr

*  Pointer to the display buffer

*

* @returns  0 if success, -1 otherwise

*

* @remarks

*  None

*

*******************************************************************************

*/

WORD32 impeg2_disp_mgr_add(disp_mgr_t *ps_disp_mgr,

                          void *pv_ptr,

                          WORD32 i4_buf_id)

{

    WORD32 id;

    id = ps_disp_mgr->i4_wr_idx % DISP_MGR_MAX_CNT;

    ps_disp_mgr->apv_ptr[id] = pv_ptr;

    ps_disp_mgr->ai4_buf_id[id] = i4_buf_id;

    ps_disp_mgr->i4_wr_idx++;

    return 0;

}

/**

*******************************************************************************

*

* @brief

*  Gets the next buffer

*

* @par Description:

*  Gets the next display buffer

*

* @param[in] ps_disp_mgr

*  Pointer to the display buffer structure

*

* @param[out]  pi4_buf_id

*  Pointer to hold buffer id of the display buffer being returned

*

* @returns  Pointer to the next display buffer

*

* @remarks

*  None

*

*******************************************************************************

*/

void* impeg2_disp_mgr_get(disp_mgr_t *ps_disp_mgr, WORD32 *pi4_buf_id)

{

    WORD32 id;

    *pi4_buf_id = -1;

    if(ps_disp_mgr->i4_rd_idx < ps_disp_mgr->i4_wr_idx)

    {

        id = ps_disp_mgr->i4_rd_idx % DISP_MGR_MAX_CNT;

        if(NULL == ps_disp_mgr->apv_ptr[id])

        {

            return NULL;

        }

        *pi4_buf_id = ps_disp_mgr->ai4_buf_id[id];

        ps_disp_mgr->i4_rd_idx++;

        return ps_disp_mgr->apv_ptr[id];

    }

    else

        return NULL;

}