dom/midi/MIDIOutput.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/MIDIOutput.h"
   8 #include "mozilla/dom/MIDIPortChild.h"
   9 #include "mozilla/dom/MIDITypes.h"
  10 #include "mozilla/dom/MIDIOutputBinding.h"
  11 #include "mozilla/dom/MIDIUtils.h"
  12 #include "nsDOMNavigationTiming.h"
  13 #include "mozilla/ErrorResult.h"
  14 #include "mozilla/TimeStamp.h"
  15 #include "mozilla/dom/Document.h"
  16 #include "mozilla/dom/Performance.h"
  17
  18 using namespace mozilla;
  19 using namespace mozilla::dom;
  20
  21 MIDIOutput::MIDIOutput(nsPIDOMWindowInner* aWindow) : MIDIPort(aWindow) {}
  22
  23 // static
  24 RefPtr<MIDIOutput> MIDIOutput::Create(nsPIDOMWindowInner* aWindow,
  25                                       MIDIAccess* aMIDIAccessParent,
  26                                       const MIDIPortInfo& aPortInfo,
  27                                       const bool aSysexEnabled) {
  28   MOZ_ASSERT(static_cast<MIDIPortType>(aPortInfo.type()) ==
  29              MIDIPortType::Output);
  30   RefPtr<MIDIOutput> port = new MIDIOutput(aWindow);
  31   if (NS_WARN_IF(
  32           !port->Initialize(aPortInfo, aSysexEnabled, aMIDIAccessParent))) {
  33     return nullptr;
  34   }
  35   return port;
  36 }
  37
  38 JSObject* MIDIOutput::WrapObject(JSContext* aCx,
  39                                  JS::Handle<JSObject*> aGivenProto) {
  40   return MIDIOutput_Binding::Wrap(aCx, this, aGivenProto);
  41 }
  42
  43 void MIDIOutput::Send(const Sequence<uint8_t>& aData,
  44                       const Optional<double>& aTimestamp, ErrorResult& aRv) {
  45   if (Port()->DeviceState() == MIDIPortDeviceState::Disconnected) {
  46     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
  47     return;
  48   }
  49   // The timestamp passed to us is a DOMHighResTimestamp, which is in relation
  50   // to the start of navigation timing. This needs to be turned into a
  51   // TimeStamp before it hits the platform specific MIDI service.
  52   //
  53   // If timestamp is either not set or zero, set timestamp to now and send the
  54   // message ASAP.
  55   TimeStamp timestamp;
  56   if (aTimestamp.WasPassed() && aTimestamp.Value() != 0) {
  57     nsCOMPtr<Document> doc = GetOwner()->GetDoc();
  58     if (!doc) {
  59       aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
  60       return;
  61     }
  62     TimeDuration ts_diff = TimeDuration::FromMilliseconds(aTimestamp.Value());
  63     timestamp = GetOwner()
  64                     ->GetPerformance()
  65                     ->GetDOMTiming()
  66                     ->GetNavigationStartTimeStamp() +
  67                 ts_diff;
  68   } else {
  69     timestamp = TimeStamp::Now();
  70   }
  71
  72   nsTArray<MIDIMessage> msgArray;
  73   bool ret = MIDIUtils::ParseMessages(aData, timestamp, msgArray);
  74   if (!ret) {
  75     aRv.ThrowTypeError("Invalid MIDI message");
  76     return;
  77   }
  78
  79   if (msgArray.IsEmpty()) {
  80     aRv.ThrowTypeError("Empty message array");
  81     return;
  82   }
  83
  84   // TODO Move this check back to parse message so we don't have to iterate
  85   // twice.
  86   if (!SysexEnabled()) {
  87     for (auto& msg : msgArray) {
  88       if (MIDIUtils::IsSysexMessage(msg)) {
  89         aRv.Throw(NS_ERROR_DOM_INVALID_ACCESS_ERR);
  90         return;
  91       }
  92     }
  93   }
  94   Port()->SendSend(msgArray);
  95 }
  96
  97 void MIDIOutput::Clear() {
  98   if (Port()->ConnectionState() == MIDIPortConnectionState::Closed) {
  99     return;
 100   }
 101   Port()->SendClear();
 102 }