1 // Copyright 2013 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_SOUNDS_AUDIO_STREAM_HANDLER_H_ 6 #define MEDIA_AUDIO_SOUNDS_AUDIO_STREAM_HANDLER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/compiler_specific.h" 10 #include "base/strings/string_piece.h" 11 #include "base/threading/non_thread_safe.h" 12 #include "media/audio/audio_io.h" 13 #include "media/audio/audio_parameters.h" 14 #include "media/audio/sounds/wav_audio_handler.h" 15 #include "media/base/media_export.h" 16 17 namespace media { 18 19 class AudioManager; 20 21 // This class sends a sound to the audio manager. 22 class MEDIA_EXPORT AudioStreamHandler : public base::NonThreadSafe { 23 public: 24 class TestObserver { 25 public: ~TestObserver()26 virtual ~TestObserver() {} 27 28 // Following methods will be called only from the audio thread. 29 30 // Called when AudioOutputStreamProxy::Start() was successfully called. 31 virtual void OnPlay() = 0; 32 33 // Called when AudioOutputStreamProxy::Stop() was successfully called. 34 virtual void OnStop(size_t cursor) = 0; 35 }; 36 37 // C-tor for AudioStreamHandler. |wav_data| should be a raw 38 // uncompressed WAVE data which will be sent to the audio manager. 39 explicit AudioStreamHandler(const base::StringPiece& wav_data); 40 virtual ~AudioStreamHandler(); 41 42 // Returns true iff AudioStreamHandler is correctly initialized; 43 bool IsInitialized() const; 44 45 // Plays sound. Volume level will be set according to current settings 46 // and won't be changed during playback. Returns true iff new playback 47 // was successfully started. 48 // 49 // NOTE: if current playback isn't at end of stream, playback request 50 // is dropped, but true is returned. 51 bool Play(); 52 53 // Stops current playback. 54 void Stop(); 55 wav_audio_handler()56 const WavAudioHandler& wav_audio_handler() const { return wav_audio_; } 57 58 private: 59 friend class AudioStreamHandlerTest; 60 friend class SoundsManagerTest; 61 62 class AudioStreamContainer; 63 64 static void SetObserverForTesting(TestObserver* observer); 65 static void SetAudioSourceForTesting( 66 AudioOutputStream::AudioSourceCallback* source); 67 68 WavAudioHandler wav_audio_; 69 scoped_ptr<AudioStreamContainer> stream_; 70 71 bool initialized_; 72 73 DISALLOW_COPY_AND_ASSIGN(AudioStreamHandler); 74 }; 75 76 } // namespace media 77 78 #endif // MEDIA_AUDIO_SOUNDS_AUDIO_STREAM_HANDLER_H_ 79