Adds "tts" permission for Input Tools & XKB extension.
[chromium-blink-merge.git] / media / audio / android / opensles_output.h
blob914fa6e63c9c5868102774c504f97749751cffd0
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.
5 #ifndef MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
6 #define MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
8 #include <SLES/OpenSLES.h>
9 #include <SLES/OpenSLES_Android.h>
11 #include "base/compiler_specific.h"
12 #include "base/synchronization/lock.h"
13 #include "base/threading/thread_checker.h"
14 #include "media/audio/android/opensles_util.h"
15 #include "media/audio/audio_io.h"
16 #include "media/audio/audio_parameters.h"
18 namespace media {
20 class AudioManagerAndroid;
22 // Implements PCM audio output support for Android using the OpenSLES API.
23 // This class is created and lives on the Audio Manager thread but recorded
24 // audio buffers are given to us from an internal OpenSLES audio thread.
25 // All public methods should be called on the Audio Manager thread.
26 class OpenSLESOutputStream : public AudioOutputStream {
27 public:
28 static const int kMaxNumOfBuffersInQueue = 2;
30 OpenSLESOutputStream(AudioManagerAndroid* manager,
31 const AudioParameters& params,
32 SLint32 stream_type);
34 virtual ~OpenSLESOutputStream();
36 // Implementation of AudioOutputStream.
37 virtual bool Open() override;
38 virtual void Close() override;
39 virtual void Start(AudioSourceCallback* callback) override;
40 virtual void Stop() override;
41 virtual void SetVolume(double volume) override;
42 virtual void GetVolume(double* volume) override;
44 // Set the value of |muted_|. It does not affect |volume_| which can be
45 // got by calling GetVolume(). See comments for |muted_| below.
46 void SetMute(bool muted);
48 private:
49 bool CreatePlayer();
51 // Called from OpenSLES specific audio worker thread.
52 static void SimpleBufferQueueCallback(
53 SLAndroidSimpleBufferQueueItf buffer_queue,
54 void* instance);
56 // Fills up one buffer by asking the registered source for data.
57 // Called from OpenSLES specific audio worker thread.
58 void FillBufferQueue();
60 // Called from the audio manager thread.
61 void FillBufferQueueNoLock();
63 // Called in Open();
64 void SetupAudioBuffer();
66 // Called in Close();
67 void ReleaseAudioBuffer();
69 // If OpenSLES reports an error this function handles it and passes it to
70 // the attached AudioOutputCallback::OnError().
71 void HandleError(SLresult error);
73 base::ThreadChecker thread_checker_;
75 // Protects |callback_|, |active_buffer_index_|, |audio_data_|,
76 // |buffer_size_bytes_| and |simple_buffer_queue_|.
77 base::Lock lock_;
79 AudioManagerAndroid* audio_manager_;
81 // Audio playback stream type.
82 // See SLES/OpenSLES_Android.h for details.
83 SLint32 stream_type_;
85 AudioSourceCallback* callback_;
87 // Shared engine interfaces for the app.
88 media::ScopedSLObjectItf engine_object_;
89 media::ScopedSLObjectItf player_object_;
90 media::ScopedSLObjectItf output_mixer_;
92 SLPlayItf player_;
94 // Buffer queue recorder interface.
95 SLAndroidSimpleBufferQueueItf simple_buffer_queue_;
97 SLDataFormat_PCM format_;
99 // Audio buffers that are allocated in the constructor based on
100 // info from audio parameters.
101 uint8* audio_data_[kMaxNumOfBuffersInQueue];
103 int active_buffer_index_;
104 size_t buffer_size_bytes_;
106 bool started_;
108 // Volume control coming from hardware. It overrides |volume_| when it's
109 // true. Otherwise, use |volume_| for scaling.
110 // This is needed because platform voice volume never goes to zero in
111 // COMMUNICATION mode on Android.
112 bool muted_;
114 // Volume level from 0 to 1.
115 float volume_;
117 // Container for retrieving data from AudioSourceCallback::OnMoreData().
118 scoped_ptr<AudioBus> audio_bus_;
120 DISALLOW_COPY_AND_ASSIGN(OpenSLESOutputStream);
123 } // namespace media
125 #endif // MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_