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)
{
    ASSERT(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(PassRefPtrWillBeRawPtr<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);
}

bool MIDIInput::addEventListenerInternal(const AtomicString& eventType, PassRefPtrWillBeRawPtr<EventListener> listener, const EventListenerOptions& options)
{
    if (eventType == EventTypeNames::midimessage) {
        // Implicit open. See setOnmidimessage().
        open();
    }
    return EventTarget::addEventListenerInternal(eventType, listener, options);
}

void MIDIInput::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
{
    ASSERT(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;
    RefPtr<DOMUint8Array> array = DOMUint8Array::create(data, length);
    dispatchEvent(MIDIMessageEvent::create(timeStamp, array));
}

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

} // namespace blink