opensles_output.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
6#define MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
7
8#include <SLES/OpenSLES.h>
9#include <SLES/OpenSLES_Android.h>
10#include <SLES/OpenSLES_AndroidConfiguration.h>
11
12#include "base/compiler_specific.h"
13#include "media/audio/android/opensles_util.h"
14#include "media/audio/audio_io.h"
15#include "media/audio/audio_parameters.h"
16
17namespace media {
18
19class AudioManagerAndroid;
20
21// Implements PCM audio output support for Android using the OpenSLES API.
22class OpenSLESOutputStream : public AudioOutputStream {
23 public:
24  static const int kNumOfQueuesInBuffer = 2;
25
26  OpenSLESOutputStream(AudioManagerAndroid* manager,
27                       const AudioParameters& params);
28
29  virtual ~OpenSLESOutputStream();
30
31  // Implementation of AudioOutputStream.
32  virtual bool Open() OVERRIDE;
33  virtual void Close() OVERRIDE;
34  virtual void Start(AudioSourceCallback* callback) OVERRIDE;
35  virtual void Stop() OVERRIDE;
36  virtual void SetVolume(double volume) OVERRIDE;
37  virtual void GetVolume(double* volume) OVERRIDE;
38
39 private:
40  bool CreatePlayer();
41
42  static void SimpleBufferQueueCallback(
43      SLAndroidSimpleBufferQueueItf buffer_queue, void* instance);
44
45  void FillBufferQueue();
46
47  // Called in Open();
48  void SetupAudioBuffer();
49
50  // Called in Close();
51  void ReleaseAudioBuffer();
52
53  // If OpenSLES reports an error this function handles it and passes it to
54  // the attached AudioOutputCallback::OnError().
55  void HandleError(SLresult error);
56
57  AudioManagerAndroid* audio_manager_;
58
59  AudioSourceCallback* callback_;
60
61  // Shared engine interfaces for the app.
62  media::ScopedSLObjectItf engine_object_;
63  media::ScopedSLObjectItf player_object_;
64  media::ScopedSLObjectItf output_mixer_;
65
66  SLPlayItf player_;
67
68  // Buffer queue recorder interface.
69  SLAndroidSimpleBufferQueueItf simple_buffer_queue_;
70
71  SLDataFormat_PCM format_;
72
73  // Audio buffer arrays that are allocated in the constructor.
74  uint8* audio_data_[kNumOfQueuesInBuffer];
75
76  int active_queue_;
77  size_t buffer_size_bytes_;
78
79  bool started_;
80
81  // Volume level from 0 to 1.
82  float volume_;
83
84  // Container for retrieving data from AudioSourceCallback::OnMoreData().
85  scoped_ptr<AudioBus> audio_bus_;
86
87  DISALLOW_COPY_AND_ASSIGN(OpenSLESOutputStream);
88};
89
90}  // namespace media
91
92#endif  // MEDIA_AUDIO_ANDROID_OPENSLES_INPUT_H_
93