Web MIDI: MIDIAccessor platform implementation and Blink API

public/platform/Platform.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
 class WebDiscardableMemory;
 class WebFallbackThemeEngine;
 class WebFileSystem;
 class WebFileUtilities;
 class WebFlingAnimator;
 class WebGestureCurveTarget;
 class WebGestureCurve;
 class WebGraphicsContext3DProvider;
 class WebHyphenator;
 class WebIDBFactory;
+class WebMIDIAccessor;
+class WebMIDIAccessorClient;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 class WebMessagePortChannel;
 class WebMimeRegistry;
 class WebPluginListBuilder;
 class WebPrescientNetworking;
 class WebRTCPeerConnectionHandler;
 class WebRTCPeerConnectionHandlerClient;
 class WebSandboxSupport;
 class WebSocketStreamHandle;
@@ skipping 65 matching lines @@
     virtual unsigned audioHardwareOutputChannels() { return 0; }
 
     // Creates a device for audio I/O.
     // Pass in (numberOfInputChannels > 0) if live/local audio input is desired.
     virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*, const WebString& deviceId) { return 0; }
 
     // FIXME: remove deprecated APIs once chromium switches over to new method.
     virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*) { return 0; }
     virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*) { return 0; }
 
+    // MIDI ----------------------------------------------------------------
+
+    virtual WebMIDIAccessor* createMIDIAccessor(WebMIDIAccessorClient*) { return 0; }

[tkent, 2013/06/19 05:48:45]

Who is responsible to delete the resultant WebMIDIAccessor object?

[Takashi Toyoshima, 2013/06/19 06:37:18]

core/platform/midi/MIDIAccessor owns this as OwnPtr.
It exists in this change;
https://codereview.chromium.org/14196004/diff/101001/Source/core/platform/mid...

 
     // Blob ----------------------------------------------------------------
 
     // Must return non-null.
     virtual WebBlobRegistry* blobRegistry() { return 0; }
 
 
     // Database ------------------------------------------------------------
 
     // Opens a database file; dirHandle should be 0 if the caller does not need
@@ skipping 362 matching lines @@
     // If null, the platform stops providing device motion data to the current listener.
     virtual void setDeviceMotionListener(WebKit::WebDeviceMotionListener*) { }
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace WebKit
 
 #endif