/
media_buffer.c
119 lines (93 loc) · 2.84 KB
/
media_buffer.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
/******************************************************************************
*
* Copyright 2007, Silicon Image, Inc. All rights reserved.
* No part of this work may be reproduced, modified, distributed, transmitted,
* transcribed, or translated into any language or computer format, in any form
* or by any means without written permission of: Silicon Image, Inc., 1060
* East Arques Avenue, Sunnyvale, California 94085
*
*****************************************************************************/
/**
* @file media_buffer.c
*
* @brief
* Media Buffer implementation
*
* <pre>
*
* Principal Author: Joerg Detert
* Creation date: Feb 28, 2008
*
* </pre>
*
*****************************************************************************/
#include <pthread.h>
#include "media_buffer.h"
#include "media_buffer_pool.h"
static pthread_mutex_t gAtomicMutex;
void AtomicMutexInit()
{
pthread_mutex_init (&gAtomicMutex, NULL);
}
void AtomicMutexDestory()
{
pthread_mutex_destroy (&gAtomicMutex);
}
static uint32_t osAtomicIncrement(uint32_t* pVar)
{
uint32_t ret;
/* Lock the atomic mutex */
pthread_mutex_lock(&gAtomicMutex);
/* increment */
ret = ++(*pVar);
/* Unlock the atomic mutex */
pthread_mutex_unlock(&gAtomicMutex);
return ret;
}
static uint32_t osAtomicDecrement(uint32_t* pVar)
{
uint32_t ret;
/* Lock the atomic mutex */
pthread_mutex_lock(&gAtomicMutex);
/* increment */
ret = --(*pVar);
/* Unlock the atomic mutex */
pthread_mutex_unlock(&gAtomicMutex);
return ret;
}
/******************************************************************************
* MediaBufInit
*****************************************************************************/
void MediaBufInit(MediaBuffer_t *pBuf)
{
DCT_ASSERT(pBuf != NULL);
pBuf->lockCount = 0U;
pBuf->pOwner = NULL;
}
/******************************************************************************
* MediaBufLockBuffer
*****************************************************************************/
RESULT MediaBufLockBuffer(MediaBuffer_t* pBuf)
{
DCT_ASSERT(pBuf != NULL);
DCT_ASSERT(pBuf->pOwner != NULL);
osAtomicIncrement( &pBuf->lockCount );
return RET_SUCCESS;
}
/******************************************************************************
* MediaBufUnlockBuffer
*****************************************************************************/
RESULT MediaBufUnlockBuffer(MediaBuffer_t* pBuf)
{
DCT_ASSERT(pBuf != NULL);
if (pBuf->pOwner == NULL)
{
return RET_FAILURE;
}
uint32_t val = osAtomicDecrement( &pBuf->lockCount );
if(val == 0U)
{
MediaBufPoolFreeBuffer(pBuf->pOwner, pBuf);
}
return RET_SUCCESS;
}