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