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 #ifndef ANDROID_AUDIO_STREAM_IN_SOURCE_H
18 #define ANDROID_AUDIO_STREAM_IN_SOURCE_H
19 
20 #include <media/nbaio/NBAIO.h>
21 
22 namespace android {
23 
24 class StreamInHalInterface;
25 
26 // not multi-thread safe
27 class AudioStreamInSource : public NBAIO_Source {
28 
29 public:
30     AudioStreamInSource(sp<StreamInHalInterface> stream);
31     virtual ~AudioStreamInSource();
32 
33     // NBAIO_Port interface
34 
35     virtual ssize_t negotiate(const NBAIO_Format offers[], size_t numOffers,
36                               NBAIO_Format counterOffers[], size_t& numCounterOffers);
37     //virtual NBAIO_Format format() const;
38 
39     // NBAIO_Sink interface
40 
41     //virtual size_t framesRead() const;
42     virtual int64_t framesOverrun();
overruns()43     virtual int64_t overruns() { (void) framesOverrun(); return mOverruns; }
44 
45     // This is an over-estimate, and could dupe the caller into making a blocking read()
46     // FIXME Use an audio HAL API to query the buffer filling status when it's available.
availableToRead()47     virtual ssize_t availableToRead() { return mStreamBufferSizeBytes / mFrameSize; }
48 
49     virtual ssize_t read(void *buffer, size_t count);
50 
51     // NBAIO_Sink end
52 
53 #if 0   // until necessary
54     sp<StreamInHalInterface> stream() const { return mStream; }
55 #endif
56 
57 private:
58     sp<StreamInHalInterface> mStream;
59     size_t              mStreamBufferSizeBytes; // as reported by get_buffer_size()
60     int64_t             mFramesOverrun;
61     int64_t             mOverruns;
62 };
63 
64 }   // namespace android
65 
66 #endif  // ANDROID_AUDIO_STREAM_IN_SOURCE_H
67