| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef WEBKIT_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_ |
| #define WEBKIT_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_ |
| |
| #include "base/synchronization/lock.h" |
| #include "media/base/audio_renderer_sink.h" |
| #include "third_party/WebKit/Source/Platform/chromium/public/WebVector.h" |
| #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProvider.h" |
| |
| namespace WebKit { |
| class WebAudioSourceProviderClient; |
| } |
| |
| namespace webkit_media { |
| |
| // WebAudioSourceProviderImpl provides a bridge between classes: |
| // WebKit::WebAudioSourceProvider <---> media::AudioRendererSink |
| // |
| // WebAudioSourceProviderImpl wraps an existing audio sink that is used unless |
| // WebKit has set a client via setClient(). While a client is set WebKit will |
| // periodically call provideInput() to render a certain number of audio |
| // sample-frames using the sink's RenderCallback to get the data. |
| // |
| // All calls are protected by a lock. |
| class WebAudioSourceProviderImpl |
| : public WebKit::WebAudioSourceProvider, |
| public media::AudioRendererSink { |
| public: |
| explicit WebAudioSourceProviderImpl( |
| const scoped_refptr<media::AudioRendererSink>& sink); |
| |
| // WebKit::WebAudioSourceProvider implementation. |
| virtual void setClient(WebKit::WebAudioSourceProviderClient* client); |
| virtual void provideInput(const WebKit::WebVector<float*>& audio_data, |
| size_t number_of_frames); |
| |
| // media::AudioRendererSink implementation. |
| virtual void Start() OVERRIDE; |
| virtual void Stop() OVERRIDE; |
| virtual void Play() OVERRIDE; |
| virtual void Pause() OVERRIDE; |
| virtual bool SetVolume(double volume) OVERRIDE; |
| virtual void Initialize(const media::AudioParameters& params, |
| RenderCallback* renderer) OVERRIDE; |
| |
| protected: |
| virtual ~WebAudioSourceProviderImpl(); |
| |
| private: |
| // Set to true when Initialize() is called. |
| int channels_; |
| int sample_rate_; |
| double volume_; |
| |
| // Tracks the current playback state. |
| enum PlaybackState { kStopped, kStarted, kPlaying }; |
| PlaybackState state_; |
| |
| // Where audio comes from. |
| media::AudioRendererSink::RenderCallback* renderer_; |
| |
| // When set via setClient() it overrides |sink_| for consuming audio. |
| WebKit::WebAudioSourceProviderClient* client_; |
| |
| // Where audio ends up unless overridden by |client_|. |
| base::Lock sink_lock_; |
| scoped_refptr<media::AudioRendererSink> sink_; |
| scoped_ptr<media::AudioBus> bus_wrapper_; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(WebAudioSourceProviderImpl); |
| }; |
| |
| } // namespace webkit_media |
| |
| #endif // WEBKIT_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_ |