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      1 /******************************************************************************
      2  *
      3  * Copyright (C) 2015 The Android Open Source Project
      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  * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
     19 */
     20 /**
     21 *******************************************************************************
     22 * @file
     23 *  impeg2_disp_mgr.c
     24 *
     25 * @brief
     26 *  Contains function definitions for display management
     27 *
     28 * @author
     29 *  Srinivas T
     30 *
     31 * @par List of Functions:
     32 *   - impeg2_disp_mgr_init()
     33 *   - impeg2_disp_mgr_add()
     34 *   - impeg2_disp_mgr_get()
     35 *
     36 * @remarks
     37 *  None
     38 *
     39 *******************************************************************************
     40 */
     41 #include <stdio.h>
     42 #include <stdlib.h>
     43 #include "iv_datatypedef.h"
     44 #include "impeg2_defs.h"
     45 #include "impeg2_disp_mgr.h"
     46 
     47 /**
     48 *******************************************************************************
     49 *
     50 * @brief
     51 *    Initialization function for display buffer manager
     52 *
     53 * @par Description:
     54 *    Initializes the display buffer management structure
     55 *
     56 * @param[in] ps_disp_mgr
     57 *  Pointer to the display buffer management structure
     58 *
     59 * @returns none
     60 *
     61 * @remarks
     62 *  None
     63 *
     64 *******************************************************************************
     65 */
     66 void impeg2_disp_mgr_init(
     67                 disp_mgr_t *ps_disp_mgr)
     68 {
     69     WORD32 id;
     70 
     71 
     72     for(id = 0; id < DISP_MGR_MAX_CNT; id++)
     73     {
     74         ps_disp_mgr->apv_ptr[id] = NULL;
     75     }
     76 
     77     ps_disp_mgr->i4_wr_idx = 0;
     78     ps_disp_mgr->i4_rd_idx = 0;
     79 }
     80 
     81 
     82 /**
     83 *******************************************************************************
     84 *
     85 * @brief
     86 *     Adds a buffer to the display manager
     87 *
     88 * @par Description:
     89 *      Adds a buffer to the display buffer manager
     90 *
     91 * @param[in] ps_disp_mgr
     92 *  Pointer to the diaplay buffer management structure
     93 *
     94 * @param[in] buf_id
     95 *  ID of the display buffer
     96 *
     97 * @param[in] abs_poc
     98 *  Absolute POC of the display buffer
     99 *
    100 * @param[in] pv_ptr
    101 *  Pointer to the display buffer
    102 *
    103 * @returns  0 if success, -1 otherwise
    104 *
    105 * @remarks
    106 *  None
    107 *
    108 *******************************************************************************
    109 */
    110 WORD32 impeg2_disp_mgr_add(disp_mgr_t *ps_disp_mgr,
    111                           void *pv_ptr,
    112                           WORD32 i4_buf_id)
    113 {
    114 
    115 
    116     WORD32 id;
    117     id = ps_disp_mgr->i4_wr_idx % DISP_MGR_MAX_CNT;
    118 
    119     ps_disp_mgr->apv_ptr[id] = pv_ptr;
    120     ps_disp_mgr->ai4_buf_id[id] = i4_buf_id;
    121     ps_disp_mgr->i4_wr_idx++;
    122 
    123     return 0;
    124 }
    125 
    126 
    127 /**
    128 *******************************************************************************
    129 *
    130 * @brief
    131 *  Gets the next buffer
    132 *
    133 * @par Description:
    134 *  Gets the next display buffer
    135 *
    136 * @param[in] ps_disp_mgr
    137 *  Pointer to the display buffer structure
    138 *
    139 * @param[out]  pi4_buf_id
    140 *  Pointer to hold buffer id of the display buffer being returned
    141 *
    142 * @returns  Pointer to the next display buffer
    143 *
    144 * @remarks
    145 *  None
    146 *
    147 *******************************************************************************
    148 */
    149 void* impeg2_disp_mgr_get(disp_mgr_t *ps_disp_mgr, WORD32 *pi4_buf_id)
    150 {
    151     WORD32 id;
    152 
    153     *pi4_buf_id = -1;
    154 
    155     if(ps_disp_mgr->i4_rd_idx < ps_disp_mgr->i4_wr_idx)
    156     {
    157         id = ps_disp_mgr->i4_rd_idx % DISP_MGR_MAX_CNT;
    158         if(NULL == ps_disp_mgr->apv_ptr[id])
    159         {
    160             return NULL;
    161         }
    162 
    163         *pi4_buf_id = ps_disp_mgr->ai4_buf_id[id];
    164 
    165         ps_disp_mgr->i4_rd_idx++;
    166 
    167         return ps_disp_mgr->apv_ptr[id];
    168     }
    169     else
    170         return NULL;
    171 
    172 }
    173