third_party/WebKit/Source/modules/webmidi/MIDIInput.cpp

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#include "modules/webmidi/MIDIInput.h"

#include "modules/webmidi/MIDIAccess.h"
#include "modules/webmidi/MIDIMessageEvent.h"
#include "platform/heap/Handle.h"

namespace blink {

using PortState = MIDIAccessor::MIDIPortState;

MIDIInput* MIDIInput::create(MIDIAccess* access,
                             const String& id,
                             const String& manufacturer,
                             const String& name,
                             const String& version,
                             PortState state) {
  DCHECK(access);
  MIDIInput* input =
      new MIDIInput(access, id, manufacturer, name, version, state);
  input->suspendIfNeeded();
  return input;
}

MIDIInput::MIDIInput(MIDIAccess* access,
                     const String& id,
                     const String& manufacturer,
                     const String& name,
                     const String& version,
                     PortState state)
    : MIDIPort(access, id, manufacturer, name, TypeInput, version, state) {}

EventListener* MIDIInput::onmidimessage() {
  return getAttributeEventListener(EventTypeNames::midimessage);
}

void MIDIInput::setOnmidimessage(EventListener* listener) {
  // Implicit open. It does nothing if the port is already opened.
  // See http://www.w3.org/TR/webmidi/#widl-MIDIPort-open-Promise-MIDIPort
  open();

  setAttributeEventListener(EventTypeNames::midimessage, listener);
}

void MIDIInput::addedEventListener(
    const AtomicString& eventType,
    RegisteredEventListener& registeredListener) {
  MIDIPort::addedEventListener(eventType, registeredListener);
  if (eventType == EventTypeNames::midimessage) {
    // Implicit open. See setOnmidimessage().
    open();
  }
}

void MIDIInput::didReceiveMIDIData(unsigned portIndex,
                                   const unsigned char* data,
                                   size_t length,
                                   double timeStamp) {
  DCHECK(isMainThread());

  if (!length)
    return;

  if (getConnection() != ConnectionStateOpen)
    return;

  // Drop sysex message here when the client does not request it. Note that this
  // is not a security check but an automatic filtering for clients that do not
  // want sysex message. Also note that sysex message will never be sent unless
  // the current process has an explicit permission to handle sysex message.
  if (data[0] == 0xf0 && !midiAccess()->sysexEnabled())
    return;
  DOMUint8Array* array = DOMUint8Array::create(data, length);
  dispatchEvent(MIDIMessageEvent::create(timeStamp, array));
}

DEFINE_TRACE(MIDIInput) {
  MIDIPort::trace(visitor);
}

}  // namespace blink