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_BASE_AUDIO_RENDERER_MIXER_INPUT_H_ 6 #define MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_ 7 8 #include <vector> 9 10 #include "base/callback.h" 11 #include "media/base/audio_converter.h" 12 #include "media/base/audio_renderer_sink.h" 13 14 namespace media { 15 16 class AudioRendererMixer; 17 18 class MEDIA_EXPORT AudioRendererMixerInput NON_EXPORTED_BASE(public AudioRendererSink)19 : NON_EXPORTED_BASE(public AudioRendererSink), 20 public AudioConverter::InputCallback { 21 public: 22 typedef base::Callback<AudioRendererMixer*( 23 const AudioParameters& params)> GetMixerCB; 24 typedef base::Callback<void(const AudioParameters& params)> RemoveMixerCB; 25 26 AudioRendererMixerInput( 27 const GetMixerCB& get_mixer_cb, const RemoveMixerCB& remove_mixer_cb); 28 29 // AudioRendererSink implementation. 30 virtual void Start() OVERRIDE; 31 virtual void Stop() OVERRIDE; 32 virtual void Play() OVERRIDE; 33 virtual void Pause() OVERRIDE; 34 virtual bool SetVolume(double volume) OVERRIDE; 35 virtual void Initialize(const AudioParameters& params, 36 AudioRendererSink::RenderCallback* renderer) OVERRIDE; 37 38 // Called by AudioRendererMixer when an error occurs. 39 void OnRenderError(); 40 41 protected: 42 virtual ~AudioRendererMixerInput(); 43 44 private: 45 friend class AudioRendererMixerInputTest; 46 47 bool playing_; 48 bool initialized_; 49 double volume_; 50 51 // AudioConverter::InputCallback implementation. 52 virtual double ProvideInput(AudioBus* audio_bus, 53 base::TimeDelta buffer_delay) OVERRIDE; 54 55 // Callbacks provided during construction which allow AudioRendererMixerInput 56 // to retrieve a mixer during Initialize() and notify when it's done with it. 57 GetMixerCB get_mixer_cb_; 58 RemoveMixerCB remove_mixer_cb_; 59 60 // AudioParameters received during Initialize(). 61 AudioParameters params_; 62 63 // AudioRendererMixer provided through |get_mixer_cb_| during Initialize(), 64 // guaranteed to live (at least) until |remove_mixer_cb_| is called. 65 AudioRendererMixer* mixer_; 66 67 // Source of audio data which is provided to the mixer. 68 AudioRendererSink::RenderCallback* callback_; 69 70 // Error callback for handing to AudioRendererMixer. 71 base::Closure error_cb_; 72 73 DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerInput); 74 }; 75 76 } // namespace media 77 78 #endif // MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_ 79