| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "third_party/blink/renderer/modules/webmidi/midi_output.h" |
| |
| #include "media/midi/midi_service.mojom-blink.h" |
| #include "third_party/blink/renderer/core/dom/document.h" |
| #include "third_party/blink/renderer/core/execution_context/execution_context.h" |
| #include "third_party/blink/renderer/core/frame/local_dom_window.h" |
| #include "third_party/blink/renderer/core/timing/dom_window_performance.h" |
| #include "third_party/blink/renderer/core/timing/window_performance.h" |
| #include "third_party/blink/renderer/core/timing/worker_global_scope_performance.h" |
| #include "third_party/blink/renderer/core/workers/worker_global_scope.h" |
| #include "third_party/blink/renderer/modules/webmidi/midi_access.h" |
| #include "third_party/blink/renderer/platform/bindings/exception_state.h" |
| #include "third_party/blink/renderer/platform/instrumentation/use_counter.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| using midi::mojom::PortState; |
| |
| namespace blink { |
| |
| namespace { |
| |
| DOMUint8Array* ConvertUnsignedDataToUint8Array( |
| Vector<unsigned> unsigned_data, |
| ExceptionState& exception_state) { |
| DOMUint8Array* array = DOMUint8Array::Create(unsigned_data.size()); |
| DOMUint8Array::ValueType* array_data = array->Data(); |
| for (wtf_size_t i = 0; i < unsigned_data.size(); ++i) { |
| if (unsigned_data[i] > 0xff) { |
| exception_state.ThrowTypeError("The value at index " + String::Number(i) + |
| " (" + String::Number(unsigned_data[i]) + |
| ") is greater than 0xFF."); |
| return nullptr; |
| } |
| array_data[i] = unsigned_data[i]; |
| } |
| return array; |
| } |
| |
| base::TimeTicks GetTimeOrigin(ExecutionContext* context) { |
| DCHECK(context); |
| Performance* performance = nullptr; |
| if (LocalDOMWindow* window = context->ExecutingWindow()) { |
| performance = DOMWindowPerformance::performance(*window); |
| } else { |
| DCHECK(context->IsWorkerGlobalScope()); |
| performance = WorkerGlobalScopePerformance::performance( |
| *static_cast<WorkerGlobalScope*>(context)); |
| } |
| |
| DCHECK(performance); |
| return base::TimeTicks() + |
| TimeDelta::FromSecondsD(performance->GetTimeOrigin()); |
| } |
| |
| class MessageValidator { |
| STACK_ALLOCATED(); |
| |
| public: |
| static bool Validate(DOMUint8Array* array, |
| ExceptionState& exception_state, |
| bool sysex_enabled) { |
| MessageValidator validator(array); |
| return validator.Process(exception_state, sysex_enabled); |
| } |
| |
| private: |
| MessageValidator(DOMUint8Array* array) |
| : data_(array->Data()), length_(array->length()), offset_(0) {} |
| |
| bool Process(ExceptionState& exception_state, bool sysex_enabled) { |
| while (!IsEndOfData() && AcceptRealTimeMessages()) { |
| if (!IsStatusByte()) { |
| exception_state.ThrowTypeError("Running status is not allowed " + |
| GetPositionString()); |
| return false; |
| } |
| if (IsEndOfSysex()) { |
| exception_state.ThrowTypeError( |
| "Unexpected end of system exclusive message " + |
| GetPositionString()); |
| return false; |
| } |
| if (IsReservedStatusByte()) { |
| exception_state.ThrowTypeError("Reserved status is not allowed " + |
| GetPositionString()); |
| return false; |
| } |
| if (IsSysex()) { |
| if (!sysex_enabled) { |
| exception_state.ThrowDOMException( |
| DOMExceptionCode::kInvalidAccessError, |
| "System exclusive message is not allowed " + GetPositionString()); |
| return false; |
| } |
| if (!AcceptCurrentSysex()) { |
| if (IsEndOfData()) |
| exception_state.ThrowTypeError( |
| "System exclusive message is not ended by end of system " |
| "exclusive message."); |
| else |
| exception_state.ThrowTypeError( |
| "System exclusive message contains a status byte " + |
| GetPositionString()); |
| return false; |
| } |
| } else { |
| if (!AcceptCurrentMessage()) { |
| if (IsEndOfData()) |
| exception_state.ThrowTypeError("Message is incomplete."); |
| else |
| exception_state.ThrowTypeError("Unexpected status byte " + |
| GetPositionString()); |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| private: |
| bool IsEndOfData() { return offset_ >= length_; } |
| bool IsSysex() { return data_[offset_] == 0xf0; } |
| bool IsSystemMessage() { return data_[offset_] >= 0xf0; } |
| bool IsEndOfSysex() { return data_[offset_] == 0xf7; } |
| bool IsRealTimeMessage() { return data_[offset_] >= 0xf8; } |
| bool IsStatusByte() { return data_[offset_] & 0x80; } |
| bool IsReservedStatusByte() { |
| return data_[offset_] == 0xf4 || data_[offset_] == 0xf5 || |
| data_[offset_] == 0xf9 || data_[offset_] == 0xfd; |
| } |
| |
| bool AcceptRealTimeMessages() { |
| for (; !IsEndOfData(); offset_++) { |
| if (IsRealTimeMessage() && !IsReservedStatusByte()) |
| continue; |
| return true; |
| } |
| return false; |
| } |
| |
| bool AcceptCurrentSysex() { |
| DCHECK(IsSysex()); |
| for (offset_++; !IsEndOfData(); offset_++) { |
| if (IsReservedStatusByte()) |
| return false; |
| if (IsRealTimeMessage()) |
| continue; |
| if (IsEndOfSysex()) { |
| offset_++; |
| return true; |
| } |
| if (IsStatusByte()) |
| return false; |
| } |
| return false; |
| } |
| |
| bool AcceptCurrentMessage() { |
| DCHECK(IsStatusByte()); |
| DCHECK(!IsSysex()); |
| DCHECK(!IsReservedStatusByte()); |
| DCHECK(!IsRealTimeMessage()); |
| DCHECK(!IsEndOfSysex()); |
| static const int kChannelMessageLength[7] = { |
| 3, 3, 3, 3, 2, 2, 3}; // for 0x8*, 0x9*, ..., 0xe* |
| static const int kSystemMessageLength[7] = { |
| 2, 3, 2, 0, 0, 1, 0}; // for 0xf1, 0xf2, ..., 0xf7 |
| size_t length = IsSystemMessage() |
| ? kSystemMessageLength[data_[offset_] - 0xf1] |
| : kChannelMessageLength[(data_[offset_] >> 4) - 8]; |
| offset_++; |
| DCHECK_GT(length, 0UL); |
| if (length == 1) |
| return true; |
| for (size_t count = 1; !IsEndOfData(); offset_++) { |
| if (IsReservedStatusByte()) |
| return false; |
| if (IsRealTimeMessage()) |
| continue; |
| if (IsStatusByte()) |
| return false; |
| if (++count == length) { |
| offset_++; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| String GetPositionString() { |
| return "at index " + String::Number(offset_) + " (" + |
| String::Number(static_cast<uint16_t>(data_[offset_])) + ")."; |
| } |
| |
| const unsigned char* data_; |
| const size_t length_; |
| size_t offset_; |
| }; |
| |
| } // namespace |
| |
| MIDIOutput* MIDIOutput::Create(MIDIAccess* access, |
| unsigned port_index, |
| const String& id, |
| const String& manufacturer, |
| const String& name, |
| const String& version, |
| PortState state) { |
| DCHECK(access); |
| return MakeGarbageCollected<MIDIOutput>(access, port_index, id, manufacturer, |
| name, version, state); |
| } |
| |
| MIDIOutput::MIDIOutput(MIDIAccess* access, |
| unsigned port_index, |
| const String& id, |
| const String& manufacturer, |
| const String& name, |
| const String& version, |
| PortState state) |
| : MIDIPort(access, id, manufacturer, name, kTypeOutput, version, state), |
| port_index_(port_index) {} |
| |
| MIDIOutput::~MIDIOutput() = default; |
| |
| void MIDIOutput::send(NotShared<DOMUint8Array> array, |
| double timestamp_in_milliseconds, |
| ExceptionState& exception_state) { |
| ExecutionContext* context = GetExecutionContext(); |
| if (!context) |
| return; |
| |
| base::TimeTicks timestamp; |
| if (timestamp_in_milliseconds == 0.0) { |
| timestamp = base::TimeTicks::Now(); |
| } else { |
| timestamp = GetTimeOrigin(context) + |
| base::TimeDelta::FromMillisecondsD(timestamp_in_milliseconds); |
| } |
| SendInternal(array.View(), timestamp, exception_state); |
| } |
| |
| void MIDIOutput::send(Vector<unsigned> unsigned_data, |
| double timestamp_in_milliseconds, |
| ExceptionState& exception_state) { |
| if (!GetExecutionContext()) |
| return; |
| |
| DOMUint8Array* array = ConvertUnsignedDataToUint8Array( |
| std::move(unsigned_data), exception_state); |
| if (!array) { |
| DCHECK(exception_state.HadException()); |
| return; |
| } |
| |
| send(NotShared<DOMUint8Array>(array), timestamp_in_milliseconds, |
| exception_state); |
| } |
| |
| void MIDIOutput::send(NotShared<DOMUint8Array> data, |
| ExceptionState& exception_state) { |
| if (!GetExecutionContext()) |
| return; |
| |
| DCHECK(data); |
| SendInternal(data.View(), base::TimeTicks::Now(), exception_state); |
| } |
| |
| void MIDIOutput::send(Vector<unsigned> unsigned_data, |
| ExceptionState& exception_state) { |
| if (!GetExecutionContext()) |
| return; |
| |
| DOMUint8Array* array = ConvertUnsignedDataToUint8Array( |
| std::move(unsigned_data), exception_state); |
| if (!array) { |
| DCHECK(exception_state.HadException()); |
| return; |
| } |
| |
| SendInternal(array, base::TimeTicks::Now(), exception_state); |
| } |
| |
| void MIDIOutput::DidOpen(bool opened) { |
| if (!opened) { |
| pending_data_.clear(); |
| return; |
| } |
| |
| while (!pending_data_.empty()) { |
| auto& front = pending_data_.front(); |
| midiAccess()->SendMIDIData(port_index_, front.first->Data(), |
| front.first->length(), front.second); |
| pending_data_.TakeFirst(); |
| } |
| } |
| |
| void MIDIOutput::Trace(blink::Visitor* visitor) { |
| MIDIPort::Trace(visitor); |
| visitor->Trace(pending_data_); |
| } |
| |
| void MIDIOutput::SendInternal(DOMUint8Array* array, |
| base::TimeTicks timestamp, |
| ExceptionState& exception_state) { |
| DCHECK(GetExecutionContext()); |
| DCHECK(array); |
| DCHECK(!timestamp.is_null()); |
| UseCounter::Count(GetExecutionContext(), WebFeature::kMIDIOutputSend); |
| |
| // Implicit open. It does nothing if the port is already opened. |
| // This should be performed even if |array| is invalid. |
| open(); |
| |
| if (!MessageValidator::Validate(array, exception_state, |
| midiAccess()->sysexEnabled())) |
| return; |
| |
| if (IsOpening()) { |
| pending_data_.emplace_back(array, timestamp); |
| } else { |
| midiAccess()->SendMIDIData(port_index_, array->Data(), array->length(), |
| timestamp); |
| } |
| } |
| |
| } // namespace blink |
