blob: 6ac6d4aa4feb22cdce3dfb98ec7c1586bd582148 (
plain)
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
|
/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "MediaBufferGroup"
#include <utils/Log.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaBufferGroup.h>
namespace android {
MediaBufferGroup::MediaBufferGroup()
: mFirstBuffer(NULL),
mLastBuffer(NULL) {
}
MediaBufferGroup::~MediaBufferGroup() {
MediaBuffer *next;
for (MediaBuffer *buffer = mFirstBuffer; buffer != NULL;
buffer = next) {
next = buffer->nextBuffer();
CHECK_EQ(buffer->refcount(), 0);
buffer->setObserver(NULL);
buffer->release();
}
}
void MediaBufferGroup::add_buffer(MediaBuffer *buffer) {
Mutex::Autolock autoLock(mLock);
buffer->setObserver(this);
if (mLastBuffer) {
mLastBuffer->setNextBuffer(buffer);
} else {
mFirstBuffer = buffer;
}
mLastBuffer = buffer;
}
status_t MediaBufferGroup::acquire_buffer(
MediaBuffer **out, bool nonBlocking) {
Mutex::Autolock autoLock(mLock);
for (;;) {
for (MediaBuffer *buffer = mFirstBuffer;
buffer != NULL; buffer = buffer->nextBuffer()) {
if (buffer->refcount() == 0) {
buffer->add_ref();
buffer->reset();
*out = buffer;
goto exit;
}
}
if (nonBlocking) {
*out = NULL;
return WOULD_BLOCK;
}
// All buffers are in use. Block until one of them is returned to us.
mCondition.wait(mLock);
}
exit:
return OK;
}
void MediaBufferGroup::signalBufferReturned(MediaBuffer *) {
Mutex::Autolock autoLock(mLock);
mCondition.signal();
}
} // namespace android
|
