/******************************************************************************
*
* 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_buf_mgr.c
*
* @brief
* Contains function definitions for buffer management
*
* @author
* Srinivas T
*
* @par List of Functions:
* - ihevc_buf_mgr_init()
* - ihevc_buf_mgr_add()
* - ihevc_buf_mgr_get_next_free()
* - ihevc_buf_mgr_check_free()
* - ihevc_buf_mgr_release()
* - ihevc_buf_mgr_set_status()
* - ihevc_buf_mgr_get_status()
* - ihevc_buf_mgr_get_buf()
* - ihevc_buf_mgr_get_num_active_buf()
*
* @remarks
* None
*
*******************************************************************************
*/
#include <stdlib.h>
#include "ihevc_typedefs.h"
#include "ihevc_macros.h"
#include "ihevc_func_selector.h"
#include "ihevc_buf_mgr.h"
/**
*******************************************************************************
*
* @brief
* Buffer manager initialization function.
*
* @par Description:
* Initializes the buffer manager structure
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @returns
*
* @remarks
* None
*
*******************************************************************************
*/
void ihevc_buf_mgr_init(
buf_mgr_t *ps_buf_mgr)
{
WORD32 id;
ps_buf_mgr->u4_max_buf_cnt = BUF_MGR_MAX_CNT;
ps_buf_mgr->u4_active_buf_cnt = 0;
for(id = 0; id < BUF_MGR_MAX_CNT; id++)
{
ps_buf_mgr->au4_status[id] = 0;
ps_buf_mgr->apv_ptr[id] = NULL;
}
}
/**
*******************************************************************************
*
* @brief
* Adds and increments the buffer and buffer count.
*
* @par Description:
* Adds a buffer to the buffer manager if it is not already present and
* increments the active buffer count
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @param[in] pv_ptr
* Pointer to the buffer to be added
*
* @returns Returns 0 on success, -1 otherwise
*
* @remarks
* None
*
*******************************************************************************
*/
WORD32 ihevc_buf_mgr_add(
buf_mgr_t *ps_buf_mgr,
void *pv_ptr,
WORD32 buf_id)
{
/* Check if buffer ID is within allowed range */
if(buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt)
{
return (-1);
}
/* Check if the current ID is being used to hold some other buffer */
if((ps_buf_mgr->apv_ptr[buf_id] != NULL) &&
(ps_buf_mgr->apv_ptr[buf_id] != pv_ptr))
{
return (-1);
}
ps_buf_mgr->apv_ptr[buf_id] = pv_ptr;
return 0;
}
/**
*******************************************************************************
*
* @brief
* Gets the next free buffer.
*
* @par Description:
* Returns the next free buffer available and sets the corresponding status
* to DEC
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @param[in] pi4_buf_id
* Pointer to the id of the free buffer
*
* @returns Pointer to the free buffer
*
* @remarks
* None
*
*******************************************************************************
*/
void* ihevc_buf_mgr_get_next_free(
buf_mgr_t *ps_buf_mgr,
WORD32 *pi4_buf_id)
{
WORD32 id;
void *pv_ret_ptr;
pv_ret_ptr = NULL;
for(id = 0; id < (WORD32)ps_buf_mgr->u4_max_buf_cnt; id++)
{
/* Check if the buffer is non-null and status is zero */
if((ps_buf_mgr->au4_status[id] == 0) && (ps_buf_mgr->apv_ptr[id]))
{
*pi4_buf_id = id;
/* DEC is set to 1 */
ps_buf_mgr->au4_status[id] = 1;
pv_ret_ptr = ps_buf_mgr->apv_ptr[id];
break;
}
}
return pv_ret_ptr;
}
/**
*******************************************************************************
*
* @brief
* Checks the buffer manager for free buffers available.
*
* @par Description:
* Checks if there are any free buffers available
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @returns Returns 0 if available, -1 otherwise
*
* @remarks
* None
*
*******************************************************************************
*/
WORD32 ihevc_buf_mgr_check_free(
buf_mgr_t *ps_buf_mgr)
{
UWORD32 id;
for(id = 0; id < ps_buf_mgr->u4_max_buf_cnt; id++)
{
if((ps_buf_mgr->au4_status[id] == 0) &&
(ps_buf_mgr->apv_ptr[id]))
{
return 1;
}
}
return 0;
}
/**
*******************************************************************************
*
* @brief
* Resets the status bits.
*
* @par Description:
* resets the status bits that the mask contains (status corresponding to
* the id)
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @param[in] buf_id
* ID of the buffer status to be released
*
* @param[in] mask
* Contains the bits that are to be reset
*
* @returns 0 if success, -1 otherwise
*
* @remarks
* None
*
*******************************************************************************
*/
WORD32 ihevc_buf_mgr_release(
buf_mgr_t *ps_buf_mgr,
WORD32 buf_id,
UWORD32 mask)
{
/* If the given id is pointing to an id which is not yet added */
if(buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt)
{
return (-1);
}
ps_buf_mgr->au4_status[buf_id] &= ~mask;
/* If both the REF and DISP are zero, DEC is set to zero */
if(ps_buf_mgr->au4_status[buf_id] == 1)
{
ps_buf_mgr->au4_status[buf_id] = 0;
}
return 0;
}
/**
*******************************************************************************
*
* @brief
* Sets the status bit.
*
* @par Description:
* sets the status bits that the mask contains (status corresponding to the
* id)
*
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @param[in] buf_id
* ID of the buffer whose status needs to be modified
*
*
* @param[in] mask
* Contains the bits that are to be set
*
* @returns 0 if success, -1 otherwise
*
* @remarks
* None
*
*******************************************************************************
*/
WORD32 ihevc_buf_mgr_set_status(
buf_mgr_t *ps_buf_mgr,
WORD32 buf_id,
UWORD32 mask)
{
if(buf_id >= (WORD32)ps_buf_mgr->u4_max_buf_cnt)
{
return (-1);
}
if((ps_buf_mgr->au4_status[buf_id] & mask) != 0)
{
return (-1);
}
ps_buf_mgr->au4_status[buf_id] |= mask;
return 0;
}
/**
*******************************************************************************
*
* @brief
* Returns the status of the buffer.
*
* @par Description:
* Returns the status of the buffer corresponding to the id
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @param[in] buf_id
* ID of the buffer status required
*
* @returns Status of the buffer corresponding to the id
*
* @remarks
* None
*
*******************************************************************************
*/
UWORD32 ihevc_buf_mgr_get_status(
buf_mgr_t *ps_buf_mgr,
WORD32 buf_id)
{
return ps_buf_mgr->au4_status[buf_id];
}
/**
*******************************************************************************
*
* @brief
* Gets the buffer from the buffer manager
*
* @par Description:
* Returns the pointer to the buffer corresponding to the id
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @param[in] buf_id
* ID of the buffer required
*
* @returns Pointer to the buffer required
*
* @remarks
* None
*
*******************************************************************************
*/
void* ihevc_buf_mgr_get_buf(
buf_mgr_t *ps_buf_mgr,
WORD32 buf_id)
{
return ps_buf_mgr->apv_ptr[buf_id];
}
/**
*******************************************************************************
*
* @brief
* Gets the no.of active buffer
*
* @par Description:
* Return the number of active buffers in the buffer manager
*
* @param[in] ps_buf_mgr
* Pointer to the buffer manager
*
* @returns number of active buffers
*
* @remarks
* None
*
*******************************************************************************
*/
UWORD32 ihevc_buf_mgr_get_num_active_buf(
buf_mgr_t *ps_buf_mgr)
{
return ps_buf_mgr->u4_max_buf_cnt;
}