1bc8f53b8c1c220d9ce01526b6e3834f14af98ed5Dongwon Kang/*
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 <list>
22
23#include <media/stagefright/MediaBufferBase.h>
24#include <utils/Errors.h>
25#include <utils/threads.h>
26
27namespace android {
28
29class MediaBufferBase;
30
31class MediaBufferGroup : public MediaBufferObserver {
32public:
33    MediaBufferGroup(size_t growthLimit = 0);
34
35    // create a media buffer group with preallocated buffers
36    MediaBufferGroup(size_t buffers, size_t buffer_size, size_t growthLimit = 0);
37
38    ~MediaBufferGroup();
39
40    void add_buffer(MediaBufferBase *buffer);
41
42    bool has_buffers();
43
44    // If nonBlocking is false, it blocks until a buffer is available and
45    // passes it to the caller in *buffer, while returning OK.
46    // The returned buffer will have a reference count of 1.
47    // If nonBlocking is true and a buffer is not immediately available,
48    // buffer is set to NULL and it returns WOULD_BLOCK.
49    // If requestedSize is 0, any free MediaBuffer will be returned.
50    // If requestedSize is > 0, the returned MediaBuffer should have buffer
51    // size of at least requstedSize.
52    status_t acquire_buffer(
53            MediaBufferBase **buffer, bool nonBlocking = false, size_t requestedSize = 0);
54
55    size_t buffers() const;
56
57    // If buffer is nullptr, have acquire_buffer() check for remote release.
58    virtual void signalBufferReturned(MediaBufferBase *buffer);
59
60private:
61    struct InternalData;
62    InternalData *mInternal;
63
64    MediaBufferGroup(const MediaBufferGroup &);
65    MediaBufferGroup &operator=(const MediaBufferGroup &);
66};
67
68}  // namespace android
69
70#endif  // MEDIA_BUFFER_GROUP_H_
71