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

*

* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore

*

* 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.

*

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

/**

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

* @file

*  ihevc_disp_mgr.c

*

* @brief

*  Contains function definitions for display management

*

* @author

*  Srinivas T

*

* @par List of Functions:

*   - ihevc_disp_mgr_init()

*   - ihevc_disp_mgr_add()

*   - ihevc_disp_mgr_get()

*

* @remarks

*  None

*

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

*/

#include <stdlib.h>

#include "ihevc_typedefs.h"

#include "ihevc_macros.h"

#include "ihevc_func_selector.h"

#include "ihevc_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 ihevc_disp_mgr_init(

                disp_mgr_t *ps_disp_mgr)

{

    WORD32 id;

    ps_disp_mgr->u4_last_abs_poc = DEFAULT_POC;

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

    {

        ps_disp_mgr->ai4_abs_poc[id] = DEFAULT_POC;

        ps_disp_mgr->apv_ptr[id] = NULL;

    }

}

/**

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

*

* @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 ihevc_disp_mgr_add(disp_mgr_t *ps_disp_mgr,

                          WORD32 buf_id,

                          WORD32 abs_poc,

                          void *pv_ptr)

{

    if(buf_id >= DISP_MGR_MAX_CNT)

    {

        return (-1);

    }

    if(ps_disp_mgr->apv_ptr[buf_id] != NULL)

    {

        return (-1);

    }

    ps_disp_mgr->apv_ptr[buf_id] = pv_ptr;

    ps_disp_mgr->ai4_abs_poc[buf_id] = abs_poc;

    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* ihevc_disp_mgr_get(

                disp_mgr_t *ps_disp_mgr,

                WORD32 *pi4_buf_id)

{

    WORD32 id;

    void *pv_ret_ptr;

    WORD32 i4_min_poc;

    WORD32 min_poc_id;

    pv_ret_ptr = NULL;

    i4_min_poc = 0x7FFFFFFF;

    min_poc_id = -1;

    /* Find minimum POC */

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

    {

        if((DEFAULT_POC != ps_disp_mgr->ai4_abs_poc[id]) &&

                        (ps_disp_mgr->ai4_abs_poc[id] <= i4_min_poc))

        {

            i4_min_poc = ps_disp_mgr->ai4_abs_poc[id];

            min_poc_id = id;

        }

    }

    *pi4_buf_id = min_poc_id;

    /* If all pocs are still default_poc then return NULL */

    if(-1 == min_poc_id)

    {

        return NULL;

    }

    pv_ret_ptr = ps_disp_mgr->apv_ptr[min_poc_id];

    /* Set abs poc to default and apv_ptr to null so that the buffer is not returned again */

    ps_disp_mgr->apv_ptr[min_poc_id] = NULL;

    ps_disp_mgr->ai4_abs_poc[min_poc_id] = DEFAULT_POC;

    return pv_ret_ptr;

}