1/*
2 * Copyright (C) 2013 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_ADAPTER_H
18#define MEDIA_ADAPTER_H
19
20#include <media/stagefright/foundation/ABase.h>
21#include <media/stagefright/MediaSource.h>
22#include <media/stagefright/MediaBuffer.h>
23#include <media/stagefright/MetaData.h>
24#include <utils/threads.h>
25
26namespace android {
27
28// Convert the MediaMuxer's push model into MPEG4Writer's pull model.
29// Used only by the MediaMuxer for now.
30struct MediaAdapter : public MediaSource, public MediaBufferObserver {
31public:
32    // MetaData is used to set the format and returned at getFormat.
33    MediaAdapter(const sp<MetaData> &meta);
34    virtual ~MediaAdapter();
35    /////////////////////////////////////////////////
36    // Inherited functions from MediaSource
37    /////////////////////////////////////////////////
38
39    virtual status_t start(MetaData *params = NULL);
40    virtual status_t stop();
41    virtual sp<MetaData> getFormat();
42    virtual status_t read(
43            MediaBuffer **buffer, const ReadOptions *options = NULL);
44
45    /////////////////////////////////////////////////
46    // Inherited functions from MediaBufferObserver
47    /////////////////////////////////////////////////
48
49    virtual void signalBufferReturned(MediaBuffer *buffer);
50
51    /////////////////////////////////////////////////
52    // Non-inherited functions:
53    /////////////////////////////////////////////////
54
55    // pushBuffer() will wait for the read() finish, and read() will have a
56    // deep copy, such that after pushBuffer return, the buffer can be re-used.
57    status_t pushBuffer(MediaBuffer *buffer);
58
59private:
60    Mutex mAdapterLock;
61    // Make sure the read() wait for the incoming buffer.
62    Condition mBufferReadCond;
63    // Make sure the pushBuffer() wait for the current buffer consumed.
64    Condition mBufferReturnedCond;
65
66    MediaBuffer *mCurrentMediaBuffer;
67
68    bool mStarted;
69    sp<MetaData> mOutputFormat;
70
71    DISALLOW_EVIL_CONSTRUCTORS(MediaAdapter);
72};
73
74}  // namespace android
75
76#endif  // MEDIA_ADAPTER_H
77