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 "NBAIO.h"
21
22namespace android {
23
24class StreamInHalInterface;
25
26// not multi-thread safe
27class AudioStreamInSource : public NBAIO_Source {
28
29public:
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();
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.
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
57private:
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