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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 *  ih264_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 *   - ih264_disp_mgr_init()
     33 *   - ih264_disp_mgr_add()
     34 *   - ih264_disp_mgr_get()
     35 *
     36 * @remarks
     37 *  None
     38 *
     39 *******************************************************************************
     40 */
     41 #include <stdlib.h>
     42 #include "ih264_typedefs.h"
     43 #include "ih264_macros.h"
     44 #include "ih264_disp_mgr.h"
     45 
     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 ih264_disp_mgr_init(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 display 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 ih264_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* ih264_disp_mgr_get(disp_mgr_t *ps_disp_mgr, WORD32 *pi4_buf_id)
    152 {
    153     WORD32 id;
    154     void *pv_ret_ptr;
    155     WORD32 i4_min_poc;
    156     WORD32 min_poc_id;
    157 
    158 
    159     pv_ret_ptr = NULL;
    160     i4_min_poc = 0x7FFFFFFF;
    161     min_poc_id = -1;
    162 
    163     /* Find minimum POC */
    164     for(id = 0; id < DISP_MGR_MAX_CNT; id++)
    165     {
    166         if((DEFAULT_POC != ps_disp_mgr->ai4_abs_poc[id]) &&
    167            (ps_disp_mgr->ai4_abs_poc[id] <= i4_min_poc))
    168         {
    169             i4_min_poc = ps_disp_mgr->ai4_abs_poc[id];
    170             min_poc_id = id;
    171         }
    172     }
    173     *pi4_buf_id = min_poc_id;
    174     /* If all pocs are still default_poc then return NULL */
    175     if(-1 == min_poc_id)
    176     {
    177         return NULL;
    178     }
    179 
    180     pv_ret_ptr = ps_disp_mgr->apv_ptr[min_poc_id];
    181 
    182     /* Set abs poc to default and apv_ptr to null so that the buffer is not returned again */
    183     ps_disp_mgr->apv_ptr[min_poc_id] = NULL;
    184     ps_disp_mgr->ai4_abs_poc[min_poc_id] = DEFAULT_POC;
    185     return pv_ret_ptr;
    186 }
    187