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 CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_ 6 #define CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_ 7 8 #include "base/memory/ref_counted.h" 9 #include "base/threading/thread_checker.h" 10 #include "media/audio/audio_parameters.h" 11 #include "media/base/audio_renderer_sink.h" 12 #include "third_party/WebKit/public/platform/WebAudioDevice.h" 13 #include "third_party/WebKit/public/platform/WebVector.h" 14 15 namespace media { 16 class AudioOutputDevice; 17 } 18 19 namespace content { 20 21 class RendererWebAudioDeviceImpl 22 : public blink::WebAudioDevice, 23 public media::AudioRendererSink::RenderCallback { 24 public: 25 RendererWebAudioDeviceImpl(const media::AudioParameters& params, 26 blink::WebAudioDevice::RenderCallback* callback, 27 int session_id); 28 virtual ~RendererWebAudioDeviceImpl(); 29 30 // blink::WebAudioDevice implementation. 31 virtual void start(); 32 virtual void stop(); 33 virtual double sampleRate(); 34 35 // AudioRendererSink::RenderCallback implementation. 36 virtual int Render(media::AudioBus* dest, 37 int audio_delay_milliseconds) OVERRIDE; 38 39 virtual void OnRenderError() OVERRIDE; 40 41 private: 42 const media::AudioParameters params_; 43 44 // Weak reference to the callback into WebKit code. 45 blink::WebAudioDevice::RenderCallback* const client_callback_; 46 47 // To avoid the need for locking, ensure the control methods of the 48 // blink::WebAudioDevice implementation are called on the same thread. 49 base::ThreadChecker thread_checker_; 50 51 // When non-NULL, we are started. When NULL, we are stopped. 52 scoped_refptr<media::AudioOutputDevice> output_device_; 53 54 // ID to allow browser to select the correct input device for unified IO. 55 int session_id_; 56 57 DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl); 58 }; 59 60 } // namespace content 61 62 #endif // CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_ 63