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      1 /******************************************************************************
      2 *
      3 * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
      4 *
      5 * Licensed under the Apache License, Version 2.0 (the "License");
      6 * you may not use this file except in compliance with the License.
      7 * You may obtain a copy of the License at:
      8 *
      9 * http://www.apache.org/licenses/LICENSE-2.0
     10 *
     11 * Unless required by applicable law or agreed to in writing, software
     12 * distributed under the License is distributed on an "AS IS" BASIS,
     13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 * See the License for the specific language governing permissions and
     15 * limitations under the License.
     16 *
     17 ******************************************************************************/
     18 /**
     19 *******************************************************************************
     20 * @file
     21 *  ihevc_disp_mgr.c
     22 *
     23 * @brief
     24 *  Contains function definitions for display management
     25 *
     26 * @author
     27 *  Srinivas T
     28 *
     29 * @par List of Functions:
     30 *   - ihevc_disp_mgr_init()
     31 *   - ihevc_disp_mgr_add()
     32 *   - ihevc_disp_mgr_get()
     33 *
     34 * @remarks
     35 *  None
     36 *
     37 *******************************************************************************
     38 */
     39 #include <stdlib.h>
     40 #include "ihevc_typedefs.h"
     41 #include "ihevc_macros.h"
     42 #include "ihevc_func_selector.h"
     43 #include "ihevc_disp_mgr.h"
     44 
     45 
     46 /**
     47 *******************************************************************************
     48 *
     49 * @brief
     50 *    Initialization function for display buffer manager
     51 *
     52 * @par Description:
     53 *    Initializes the display buffer management structure
     54 *
     55 * @param[in] ps_disp_mgr
     56 *  Pointer to the display buffer management structure
     57 *
     58 * @returns none
     59 *
     60 * @remarks
     61 *  None
     62 *
     63 *******************************************************************************
     64 */
     65 void ihevc_disp_mgr_init(
     66                 disp_mgr_t *ps_disp_mgr)
     67 {
     68     WORD32 id;
     69 
     70     ps_disp_mgr->u4_last_abs_poc = DEFAULT_POC;
     71 
     72     for(id = 0; id < DISP_MGR_MAX_CNT; id++)
     73     {
     74         ps_disp_mgr->ai4_abs_poc[id] = DEFAULT_POC;
     75         ps_disp_mgr->apv_ptr[id] = NULL;
     76     }
     77 }
     78 
     79 
     80 /**
     81 *******************************************************************************
     82 *
     83 * @brief
     84 *     Adds a buffer to the display manager
     85 *
     86 * @par Description:
     87 *      Adds a buffer to the display buffer manager
     88 *
     89 * @param[in] ps_disp_mgr
     90 *  Pointer to the diaplay buffer management structure
     91 *
     92 * @param[in] buf_id
     93 *  ID of the display buffer
     94 *
     95 * @param[in] abs_poc
     96 *  Absolute POC of the display buffer
     97 *
     98 * @param[in] pv_ptr
     99 *  Pointer to the display buffer
    100 *
    101 * @returns  0 if success, -1 otherwise
    102 *
    103 * @remarks
    104 *  None
    105 *
    106 *******************************************************************************
    107 */
    108 WORD32 ihevc_disp_mgr_add(disp_mgr_t *ps_disp_mgr,
    109                           WORD32 buf_id,
    110                           WORD32 abs_poc,
    111                           void *pv_ptr)
    112 {
    113     if(buf_id >= DISP_MGR_MAX_CNT)
    114     {
    115         return (-1);
    116     }
    117 
    118     if(ps_disp_mgr->apv_ptr[buf_id] != NULL)
    119     {
    120         return (-1);
    121     }
    122 
    123     ps_disp_mgr->apv_ptr[buf_id] = pv_ptr;
    124     ps_disp_mgr->ai4_abs_poc[buf_id] = abs_poc;
    125     return 0;
    126 }
    127 
    128 
    129 /**
    130 *******************************************************************************
    131 *
    132 * @brief
    133 *  Gets the next buffer
    134 *
    135 * @par Description:
    136 *  Gets the next display buffer
    137 *
    138 * @param[in] ps_disp_mgr
    139 *  Pointer to the display buffer structure
    140 *
    141 * @param[out]  pi4_buf_id
    142 *  Pointer to hold buffer id of the display buffer being returned
    143 *
    144 * @returns  Pointer to the next display buffer
    145 *
    146 * @remarks
    147 *  None
    148 *
    149 *******************************************************************************
    150 */
    151 void* ihevc_disp_mgr_get(
    152                 disp_mgr_t *ps_disp_mgr,
    153                 WORD32 *pi4_buf_id)
    154 {
    155     WORD32 id;
    156     void *pv_ret_ptr;
    157     WORD32 i4_min_poc;
    158     WORD32 min_poc_id;
    159 
    160 
    161     pv_ret_ptr = NULL;
    162     i4_min_poc = 0x7FFFFFFF;
    163     min_poc_id = -1;
    164 
    165     /* Find minimum POC */
    166     for(id = 0; id < DISP_MGR_MAX_CNT; id++)
    167     {
    168         if((DEFAULT_POC != ps_disp_mgr->ai4_abs_poc[id]) &&
    169                         (ps_disp_mgr->ai4_abs_poc[id] <= i4_min_poc))
    170         {
    171             i4_min_poc = ps_disp_mgr->ai4_abs_poc[id];
    172             min_poc_id = id;
    173         }
    174     }
    175     *pi4_buf_id = min_poc_id;
    176     /* If all pocs are still default_poc then return NULL */
    177     if(-1 == min_poc_id)
    178     {
    179         return NULL;
    180     }
    181 
    182     pv_ret_ptr = ps_disp_mgr->apv_ptr[min_poc_id];
    183 
    184     /* Set abs poc to default and apv_ptr to null so that the buffer is not returned again */
    185     ps_disp_mgr->apv_ptr[min_poc_id] = NULL;
    186     ps_disp_mgr->ai4_abs_poc[min_poc_id] = DEFAULT_POC;
    187     return pv_ret_ptr;
    188 }
    189