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445 lines
9.7 KiB
445 lines
9.7 KiB
/******************************************************************************
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*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/**
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*******************************************************************************
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* @file
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* impeg2_buf_mgr.c
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*
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* @brief
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* Contains function definitions for buffer management
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*
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* @author
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* Srinivas T
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*
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* @par List of Functions:
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* - impeg2_buf_mgr_init()
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* - impeg2_buf_mgr_add()
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* - impeg2_buf_mgr_get_next_free()
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* - impeg2_buf_mgr_check_free()
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* - impeg2_buf_mgr_release()
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* - impeg2_buf_mgr_set_status()
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* - impeg2_buf_mgr_get_status()
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* - impeg2_buf_mgr_get_buf()
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* - impeg2_buf_mgr_get_num_active_buf()
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "iv_datatypedef.h"
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#include "impeg2_defs.h"
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#include "impeg2_buf_mgr.h"
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/**
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*******************************************************************************
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*
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* @brief
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* Buffer manager initialization function.
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*
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* @par Description:
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* Initializes the buffer manager structure
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @returns
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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void impeg2_buf_mgr_init(
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buf_mgr_t *ps_buf_mgr)
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{
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WORD32 id;
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ps_buf_mgr->u4_max_buf_cnt = BUF_MGR_MAX_CNT;
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ps_buf_mgr->u4_active_buf_cnt = 0;
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for(id = 0; id < BUF_MGR_MAX_CNT; id++)
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{
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ps_buf_mgr->au4_status[id] = 0;
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ps_buf_mgr->apv_ptr[id] = NULL;
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}
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Buffer manager reset function.
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*
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* @par Description:
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* Resets the buffer manager structure
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @returns
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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void impeg2_buf_mgr_reset(
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buf_mgr_t *ps_buf_mgr)
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{
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WORD32 id;
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ps_buf_mgr->u4_max_buf_cnt = BUF_MGR_MAX_CNT;
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ps_buf_mgr->u4_active_buf_cnt = 0;
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for(id = 0; id < BUF_MGR_MAX_CNT; id++)
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{
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ps_buf_mgr->au4_status[id] = 0;
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}
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Adds and increments the buffer and buffer count.
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*
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* @par Description:
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* Adds a buffer to the buffer manager if it is not already present and
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* increments the active buffer count
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @param[in] pv_ptr
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* Pointer to the buffer to be added
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*
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* @returns Returns 0 on success, -1 otherwise
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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WORD32 impeg2_buf_mgr_add(
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buf_mgr_t *ps_buf_mgr,
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void *pv_ptr,
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WORD32 i4_buf_id)
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{
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/* Check if buffer ID is within allowed range */
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if(i4_buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt)
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{
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return (-1);
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}
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/* Check if the current ID is being used to hold some other buffer */
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if((ps_buf_mgr->apv_ptr[i4_buf_id] != NULL) &&
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(ps_buf_mgr->apv_ptr[i4_buf_id] != pv_ptr))
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{
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return (-1);
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}
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ps_buf_mgr->apv_ptr[i4_buf_id] = pv_ptr;
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return 0;
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Gets the next free buffer.
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*
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* @par Description:
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* Returns the next free buffer available and sets the corresponding status
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* to DEC
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @param[in] pi4_buf_id
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* Pointer to the id of the free buffer
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*
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* @returns Pointer to the free buffer
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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void* impeg2_buf_mgr_get_next_free(
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buf_mgr_t *ps_buf_mgr,
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WORD32 *pi4_buf_id)
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{
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WORD32 id;
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void *pv_ret_ptr;
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pv_ret_ptr = NULL;
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for(id = 0; id < (WORD32)ps_buf_mgr->u4_max_buf_cnt; id++)
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{
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/* Check if the buffer is non-null and status is zero */
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if((ps_buf_mgr->au4_status[id] == 0) && (ps_buf_mgr->apv_ptr[id]))
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{
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*pi4_buf_id = id;
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/* DEC is set to 1 */
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ps_buf_mgr->au4_status[id] = 1;
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pv_ret_ptr = ps_buf_mgr->apv_ptr[id];
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break;
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}
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}
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return pv_ret_ptr;
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Checks the buffer manager for free buffers available.
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*
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* @par Description:
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* Checks if there are any free buffers available
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @returns Returns 0 if available, -1 otherwise
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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WORD32 impeg2_buf_mgr_check_free(
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buf_mgr_t *ps_buf_mgr)
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{
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UWORD32 id;
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for(id = 0; id < ps_buf_mgr->u4_max_buf_cnt; id++)
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{
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if((ps_buf_mgr->au4_status[id] == 0) &&
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(ps_buf_mgr->apv_ptr[id]))
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{
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return 1;
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}
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}
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return 0;
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Resets the status bits.
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*
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* @par Description:
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* resets the status bits that the mask contains (status corresponding to
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* the id)
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @param[in] buf_id
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* ID of the buffer status to be released
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*
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* @param[in] mask
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* Contains the bits that are to be reset
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*
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* @returns 0 if success, -1 otherwise
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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WORD32 impeg2_buf_mgr_release(
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buf_mgr_t *ps_buf_mgr,
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WORD32 i4_buf_id,
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UWORD32 u4_mask)
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{
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/* If the given id is pointing to an id which is not yet added */
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if(i4_buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt)
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{
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return (-1);
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}
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if(0 == (ps_buf_mgr->au4_status[i4_buf_id] & u4_mask))
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{
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return (-1);
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}
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ps_buf_mgr->au4_status[i4_buf_id] &= ~u4_mask;
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/* If both the REF and DISP are zero, DEC is set to zero */
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if(ps_buf_mgr->au4_status[i4_buf_id] == 1)
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{
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ps_buf_mgr->au4_status[i4_buf_id] = 0;
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}
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return 0;
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Sets the status bit.
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*
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* @par Description:
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* sets the status bits that the mask contains (status corresponding to the
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* id)
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*
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @param[in] buf_id
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* ID of the buffer whose status needs to be modified
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*
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*
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* @param[in] mask
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* Contains the bits that are to be set
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*
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* @returns 0 if success, -1 otherwise
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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WORD32 impeg2_buf_mgr_set_status(
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buf_mgr_t *ps_buf_mgr,
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WORD32 i4_buf_id,
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UWORD32 u4_mask)
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{
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if(i4_buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt)
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{
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return (-1);
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}
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if((ps_buf_mgr->au4_status[i4_buf_id] & u4_mask) != 0)
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{
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return (-1);
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}
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ps_buf_mgr->au4_status[i4_buf_id] |= u4_mask;
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return 0;
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Returns the status of the buffer.
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*
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* @par Description:
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* Returns the status of the buffer corresponding to the id
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @param[in] buf_id
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* ID of the buffer status required
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*
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* @returns Status of the buffer corresponding to the id
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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UWORD32 impeg2_buf_mgr_get_status(
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buf_mgr_t *ps_buf_mgr,
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WORD32 i4_buf_id)
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{
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return ps_buf_mgr->au4_status[i4_buf_id];
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Gets the buffer from the buffer manager
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*
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* @par Description:
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* Returns the pointer to the buffer corresponding to the id
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @param[in] buf_id
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* ID of the buffer required
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*
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* @returns Pointer to the buffer required
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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void* impeg2_buf_mgr_get_buf(
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buf_mgr_t *ps_buf_mgr,
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WORD32 i4_buf_id)
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{
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return ps_buf_mgr->apv_ptr[i4_buf_id];
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}
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/**
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*******************************************************************************
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*
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* @brief
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* Gets the no.of active buffer
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*
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* @par Description:
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* Return the number of active buffers in the buffer manager
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*
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* @param[in] ps_buf_mgr
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* Pointer to the buffer manager
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*
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* @returns number of active buffers
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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UWORD32 impeg2_buf_mgr_get_num_active_buf(
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buf_mgr_t *ps_buf_mgr)
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{
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return ps_buf_mgr->u4_max_buf_cnt;
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}
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