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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 #include "config.h"
     32 #include "modules/webmidi/MIDIInput.h"
     33 
     34 #include "modules/webmidi/MIDIAccess.h"
     35 #include "modules/webmidi/MIDIMessageEvent.h"
     36 
     37 namespace WebCore {
     38 
     39 PassRefPtr<MIDIInput> MIDIInput::create(MIDIAccess* access, ExecutionContext* context, const String& id, const String& manufacturer, const String& name, const String& version)
     40 {
     41     ASSERT(access);
     42     RefPtr<MIDIInput> input = adoptRef(new MIDIInput(access, context, id, manufacturer, name, version));
     43     input->suspendIfNeeded();
     44     return input.release();
     45 }
     46 
     47 MIDIInput::MIDIInput(MIDIAccess* access, ExecutionContext* context, const String& id, const String& manufacturer, const String& name, const String& version)
     48     : MIDIPort(context, id, manufacturer, name, MIDIPortTypeInput, version)
     49     , m_access(access)
     50 {
     51     ScriptWrappable::init(this);
     52 }
     53 
     54 void MIDIInput::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
     55 {
     56     ASSERT(isMainThread());
     57 
     58     if (!length)
     59         return;
     60 
     61     // Drop SysEx message here when the client does not request it. Note that this is not a security check but an
     62     // automatic filtering for clients that do not want SysEx message. Also note that SysEx message will never be sent
     63     // unless the current process has an explicit permission to handle SysEx message.
     64     if (data[0] == 0xf0 && !m_access->sysExEnabled())
     65         return;
     66     RefPtr<Uint8Array> array = Uint8Array::create(data, length);
     67     dispatchEvent(MIDIMessageEvent::create(timeStamp, array));
     68 }
     69 
     70 } // namespace WebCore
     71