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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef MIDIAccess_h
     32 #define MIDIAccess_h
     33 
     34 #include "bindings/v8/ScriptWrappable.h"
     35 #include "core/dom/ActiveDOMObject.h"
     36 #include "core/events/EventTarget.h"
     37 #include "modules/webmidi/MIDIAccessor.h"
     38 #include "modules/webmidi/MIDIAccessorClient.h"
     39 #include "modules/webmidi/MIDIInput.h"
     40 #include "modules/webmidi/MIDIOutput.h"
     41 #include "wtf/RefCounted.h"
     42 #include "wtf/RefPtr.h"
     43 #include "wtf/Vector.h"
     44 
     45 namespace WebCore {
     46 
     47 class ExecutionContext;
     48 class MIDIAccessPromise;
     49 
     50 class MIDIAccess : public RefCounted<MIDIAccess>, public ScriptWrappable, public ActiveDOMObject, public EventTargetWithInlineData, public MIDIAccessorClient {
     51     REFCOUNTED_EVENT_TARGET(MIDIAccess);
     52 public:
     53     virtual ~MIDIAccess();
     54     static PassRefPtr<MIDIAccess> create(ExecutionContext*, MIDIAccessPromise*);
     55 
     56     MIDIInputVector inputs() const { return m_inputs; }
     57     MIDIOutputVector outputs() const { return m_outputs; }
     58 
     59     DEFINE_ATTRIBUTE_EVENT_LISTENER(connect);
     60     DEFINE_ATTRIBUTE_EVENT_LISTENER(disconnect);
     61 
     62     void setSysExEnabled(bool);
     63     bool sysExEnabled() const { return m_sysExEnabled; }
     64 
     65     // EventTarget
     66     virtual const AtomicString& interfaceName() const OVERRIDE { return EventTargetNames::MIDIAccess; }
     67     virtual ExecutionContext* executionContext() const OVERRIDE { return ActiveDOMObject::executionContext(); }
     68 
     69     // ActiveDOMObject
     70     virtual void stop();
     71 
     72     // MIDIAccessorClient
     73     virtual void didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version) OVERRIDE;
     74     virtual void didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version) OVERRIDE;
     75     virtual void didStartSession(bool success) OVERRIDE;
     76     virtual void didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp) OVERRIDE;
     77 
     78     // |timeStampInMilliseconds| is in the same time coordinate system as performance.now().
     79     void sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStampInMilliseconds);
     80 
     81 private:
     82     MIDIAccess(ExecutionContext*, MIDIAccessPromise*);
     83 
     84     void startRequest();
     85     virtual void permissionDenied();
     86 
     87     MIDIInputVector m_inputs;
     88     MIDIOutputVector m_outputs;
     89     MIDIAccessPromise* m_promise;
     90 
     91     OwnPtr<MIDIAccessor> m_accessor;
     92     bool m_hasAccess;
     93     bool m_sysExEnabled;
     94     bool m_requesting;
     95 };
     96 
     97 } // namespace WebCore
     98 
     99 #endif // MIDIAccess_h
    100