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