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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#include "mozilla/dom/MIDIOutput.h"
#include "mozilla/dom/MIDIPortChild.h"
#include "mozilla/dom/MIDITypes.h"
#include "mozilla/dom/MIDIOutputBinding.h"
#include "mozilla/dom/MIDIUtils.h"
#include "nsDOMNavigationTiming.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/Performance.h"
using namespace mozilla;
using namespace mozilla::dom;
MIDIOutput::MIDIOutput(nsPIDOMWindowInner* aWindow,
MIDIAccess* aMIDIAccessParent)
: MIDIPort(aWindow, aMIDIAccessParent) {}
// static
MIDIOutput* MIDIOutput::Create(nsPIDOMWindowInner* aWindow,
MIDIAccess* aMIDIAccessParent,
const MIDIPortInfo& aPortInfo,
const bool aSysexEnabled) {
MOZ_ASSERT(static_cast<MIDIPortType>(aPortInfo.type()) ==
auto port = new MIDIOutput(aWindow, aMIDIAccessParent);
if (NS_WARN_IF(!port->Initialize(aPortInfo, aSysexEnabled))) {
return nullptr;
return port;
JSObject* MIDIOutput::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MIDIOutput_Binding::Wrap(aCx, this, aGivenProto);
void MIDIOutput::Send(const Sequence<uint8_t>& aData,
const Optional<double>& aTimestamp, ErrorResult& aRv) {
if (mPort->DeviceState() == MIDIPortDeviceState::Disconnected) {
// The timestamp passed to us is a DOMHighResTimestamp, which is in relation
// to the start of navigation timing. This needs to be turned into a
// TimeStamp before it hits the platform specific MIDI service.
// If timestamp is either not set or zero, set timestamp to now and send the
// message ASAP.
TimeStamp timestamp;
if (aTimestamp.WasPassed() && aTimestamp.Value() != 0) {
nsCOMPtr<Document> doc = GetOwner()->GetDoc();
if (!doc) {
TimeDuration ts_diff = TimeDuration::FromMilliseconds(aTimestamp.Value());
timestamp = GetOwner()
->GetNavigationStartTimeStamp() +
} else {
timestamp = TimeStamp::Now();
nsTArray<MIDIMessage> msgArray;
MIDIUtils::ParseMessages(aData, timestamp, msgArray);
// Our translation of the spec is that invalid messages in a multi-message
// sequence will be thrown out, but that valid messages will still be used.
if (msgArray.IsEmpty()) {
aRv.ThrowTypeError("Empty message array");
// TODO Move this check back to parse message so we don't have to iterate
// twice.
if (!SysexEnabled()) {
for (auto& msg : msgArray) {
if (MIDIUtils::IsSysexMessage(msg)) {
void MIDIOutput::Clear() {
if (mPort->ConnectionState() == MIDIPortConnectionState::Closed) {