[PPAPI] Pepper MediaStream API audio track implementation and example.

content/renderer/pepper/pepper_media_stream_audio_track_host.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// Copyright (c) 2014 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_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
-#define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
+#ifndef CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_AUDIO_TRACK_HOST_H_
+#define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_AUDIO_TRACK_HOST_H_
 
 #include "base/compiler_specific.h"
-#include "content/public/renderer/media_stream_video_sink.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
-#include "media/base/video_frame.h"
+#include "media/audio/audio_parameters.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
-#include "ui/gfx/size.h"
+
+namespace base {
+class MessageLoopProxy;
+}  // namespace base
 
 namespace content {
 
-class PepperMediaStreamVideoTrackHost : public PepperMediaStreamTrackHostBase,
-                                        public MediaStreamVideoSink {
+class PepperMediaStreamAudioTrackHost : public PepperMediaStreamTrackHostBase,
+                                        public MediaStreamAudioSink {
  public:
-  PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
+  PepperMediaStreamAudioTrackHost(RendererPpapiHost* host,
                                   PP_Instance instance,
                                   PP_Resource resource,
                                   const blink::WebMediaStreamTrack& track);
 
  private:
-  virtual ~PepperMediaStreamVideoTrackHost();
+  virtual ~PepperMediaStreamAudioTrackHost();
+
+  void InitFramesOnMainThread(uint32_t number_of_frames, uint32_t frame_size);
 
   // PepperMediaStreamTrackHostBase overrides:
   virtual void OnClose() OVERRIDE;
 
-  // MediaStreamVideoSink overrides:
-  virtual void OnVideoFrame(
-      const scoped_refptr<media::VideoFrame>& frame) OVERRIDE;
+  // MediaStreamAudioSink overrides:
+  virtual void OnData(const int16* audio_data,
+                      int sample_rate,
+                      int number_of_channels,
+                      int number_of_frames) OVERRIDE;
+  virtual void OnSetFormat(const media::AudioParameters& params) OVERRIDE;
 
   // ResourceHost overrides:
   virtual void DidConnectPendingHostToResource() OVERRIDE;
 
   blink::WebMediaStreamTrack track_;
 
   // True if it has been added to |blink::WebMediaStreamTrack| as a sink.
   bool connected_;
 
-  // Frame size.
-  gfx::Size frame_size_;
+  // Timestamp of the next received audio frame.
+  base::TimeDelta timestamp_;
 
-  // Frame format.
-  media::VideoFrame::Format frame_format_;
+  // Duration of one audio frame.
+  base::TimeDelta frame_duration_;
+
+  media::AudioParameters audio_params_;
 
   // The size of frame pixels in bytes.
   uint32_t frame_data_size_;
 
-  DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
+  scoped_refptr<base::MessageLoopProxy> main_message_loop_proxy_;
+
+  base::WeakPtrFactory<PepperMediaStreamAudioTrackHost> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamAudioTrackHost);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_AUDIO_TRACK_HOST_H_