Moving FIFO from AudioDestination to RendererWebAudioDeviceImpl

content/renderer/media/renderer_webaudiodevice_impl.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 #include "third_party/WebKit/public/platform/WebAudioDevice.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "url/origin.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 class NullAudioSink;
+class AudioPullFifo;
 }
 
 namespace content {
 
 class RendererWebAudioDeviceImpl
     : public blink::WebAudioDevice,
       public media::AudioRendererSink::RenderCallback {
  public:
   RendererWebAudioDeviceImpl(const media::AudioParameters& params,
                              blink::WebAudioDevice::RenderCallback* callback,
                              int session_id,
                              const url::Origin& security_origin);
   ~RendererWebAudioDeviceImpl() override;
 
   // blink::WebAudioDevice implementation.
   void start() override;
   void stop() override;
   double sampleRate() override;
 
   // AudioRendererSink::RenderCallback implementation.
   int Render(media::AudioBus* dest,
              uint32_t frames_delayed,
              uint32_t frames_skipped) override;
 
   void OnRenderError() override;
 
  private:
-  const media::AudioParameters params_;
+  // Called by AudioPullFifo when more data is necessary.
+  void SourceCallback(int fifo_frames_delay, media::AudioBus* audio_bus);
+
+  // Creates a FIFO to rebuffer audio between the client and the sink.
+  void CreateFifoIfRequired(int render_frames_per_buffer);
+
+  // Parameters of audio being pulled from the client.
+  const media::AudioParameters client_params_;
 
   // Weak reference to the callback into WebKit code.
   blink::WebAudioDevice::RenderCallback* const client_callback_;
 
   // To avoid the need for locking, ensure the control methods of the
   // blink::WebAudioDevice implementation are called on the same thread.
   base::ThreadChecker thread_checker_;
 
   // When non-NULL, we are started.  When NULL, we are stopped.
   scoped_refptr<media::AudioRendererSink> sink_;
@@ skipping 21 matching lines @@
 
   bool is_first_buffer_after_silence_;
 
   // A cancelable task that is posted to start the |null_audio_sink_| after a
   // period of silence. We do this on android to save battery consumption.
   base::CancelableClosure start_null_audio_sink_callback_;
 
   // Security origin, used to check permissions for |output_device_|.
   url::Origin security_origin_;
 
+  // Used to buffer data between the client and the sink in cases where
+  // the client buffer size is not the same as rendering buffer size.
+  std::unique_ptr<media::AudioPullFifo> audio_fifo_;
+
   DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_