AudioStreamInSource.h revision 2dd4bdd715f586d4d30cf90cc6fc2bbfbce60fe0 
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
23namespace android {
24
25// not multi-thread safe
26class AudioStreamInSource : public NBAIO_Source {
27
28public:
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();
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.
46    virtual ssize_t availableToRead() { return mStreamBufferSizeBytes >> mBitShift; }
47
48    virtual ssize_t read(void *buffer, size_t count);
49
50    // NBAIO_Sink end
51
52#if 0   // until necessary
53    audio_stream_in *stream() const { return mStream; }
54#endif
55
56private:
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