1 /*
2  * Copyright (C) 2012 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 // Implementation of AudioBufferProvider that wraps an NBAIO_Source
18 
19 #ifndef ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
20 #define ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
21 
22 #include <media/nbaio/NBAIO.h>
23 #include <media/ExtendedAudioBufferProvider.h>
24 
25 namespace android {
26 
27 class SourceAudioBufferProvider : public ExtendedAudioBufferProvider {
28 
29 public:
30     SourceAudioBufferProvider(const sp<NBAIO_Source>& source);
31     virtual ~SourceAudioBufferProvider();
32 
33     // AudioBufferProvider interface
34     virtual status_t getNextBuffer(Buffer *buffer);
35     virtual void     releaseBuffer(Buffer *buffer);
36 
37     // ExtendedAudioBufferProvider interface
38     virtual size_t   framesReady() const;
39     virtual int64_t  framesReleased() const;
40     virtual void     onTimestamp(const ExtendedTimestamp &timestamp);
41 
42 private:
43     const sp<NBAIO_Source> mSource;     // the wrapped source
44     /*const*/ size_t    mFrameSize; // frame size in bytes
45     void*               mAllocated; // pointer to base of allocated memory
46     size_t              mSize;      // size of mAllocated in frames
47     size_t              mOffset;    // frame offset within mAllocated of valid data
48     size_t              mRemaining; // frame count within mAllocated of valid data
49     size_t              mGetCount;  // buffer.frameCount of the most recent getNextBuffer
50     int64_t             mFramesReleased;    // counter of the total number of frames released
51 };
52 
53 }   // namespace android
54 
55 #endif  // ANDROID_SOURCE_AUDIO_BUFFER_PROVIDER_H
56