1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef MEDIA_BUFFER_GROUP_H_
18
19#define MEDIA_BUFFER_GROUP_H_
20
21#include <media/stagefright/MediaBuffer.h>
22#include <utils/Errors.h>
23#include <utils/threads.h>
24
25namespace android {
26
27class MediaBuffer;
28class MetaData;
29
30class MediaBufferGroup : public MediaBufferObserver {
31public:
32    MediaBufferGroup();
33    ~MediaBufferGroup();
34
35    void add_buffer(MediaBuffer *buffer);
36
37    // If nonBlocking is false, it blocks until a buffer is available and
38    // passes it to the caller in *buffer, while returning OK.
39    // The returned buffer will have a reference count of 1.
40    // If nonBlocking is true and a buffer is not immediately available,
41    // buffer is set to NULL and it returns WOULD_BLOCK.
42    status_t acquire_buffer(MediaBuffer **buffer, bool nonBlocking = false);
43
44protected:
45    virtual void signalBufferReturned(MediaBuffer *buffer);
46
47private:
48    friend class MediaBuffer;
49
50    Mutex mLock;
51    Condition mCondition;
52
53    MediaBuffer *mFirstBuffer, *mLastBuffer;
54
55    MediaBufferGroup(const MediaBufferGroup &);
56    MediaBufferGroup &operator=(const MediaBufferGroup &);
57};
58
59}  // namespace android
60
61#endif  // MEDIA_BUFFER_GROUP_H_
62