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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/webmidi/midi_dispatcher.h"
#include "third_party/blink/public/platform/interface_provider.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/renderer/modules/webmidi/midi_accessor.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
namespace blink {
namespace {
// The maximum number of bytes which we're allowed to send to the browser
// before getting acknowledgement back from the browser that they've been
// successfully sent.
static const size_t kMaxUnacknowledgedBytesSent = 10 * 1024 * 1024; // 10 MB.
} // namespace
MIDIDispatcher::MIDIDispatcher() : binding_(this) {}
MIDIDispatcher::~MIDIDispatcher() = default;
MIDIDispatcher& MIDIDispatcher::Instance() {
DEFINE_STATIC_LOCAL(Persistent<MIDIDispatcher>, midi_dispatcher,
(MakeGarbageCollected<MIDIDispatcher>()));
return *midi_dispatcher;
}
void MIDIDispatcher::Trace(Visitor* visitor) {}
void MIDIDispatcher::AddAccessor(MIDIAccessor* accessor) {
TRACE_EVENT0("midi", "MIDIDispatcher::AddAccessor");
accessors_waiting_session_queue_.push_back(accessor);
if (session_result_ != midi::mojom::Result::NOT_INITIALIZED) {
SessionStarted(session_result_);
} else if (accessors_waiting_session_queue_.size() == 1u) {
midi::mojom::blink::MidiSessionClientPtr client_ptr;
binding_.Bind(mojo::MakeRequest(&client_ptr));
GetMidiSessionProvider().StartSession(mojo::MakeRequest(&midi_session_),
std::move(client_ptr));
}
}
void MIDIDispatcher::RemoveAccessor(MIDIAccessor* accessor) {
// |accessor| should either be in |accessors_| or
// |accessors_waiting_session_queue_|, but not both.
DCHECK_NE(accessors_.Contains(accessor),
accessors_waiting_session_queue_.Contains(accessor))
<< "RemoveAccessor call was not balanced with AddAccessor call";
auto** it = std::find(accessors_.begin(), accessors_.end(), accessor);
if (it != accessors_.end()) {
accessors_.erase(it);
} else {
accessors_waiting_session_queue_.erase(
std::find(accessors_waiting_session_queue_.begin(),
accessors_waiting_session_queue_.end(), accessor));
}
if (accessors_.IsEmpty() && accessors_waiting_session_queue_.IsEmpty()) {
session_result_ = midi::mojom::Result::NOT_INITIALIZED;
inputs_.clear();
outputs_.clear();
midi_session_.reset();
midi_session_provider_.reset();
binding_.Close();
}
}
void MIDIDispatcher::SendMidiData(uint32_t port,
const uint8_t* data,
wtf_size_t length,
base::TimeTicks timestamp) {
if ((kMaxUnacknowledgedBytesSent - unacknowledged_bytes_sent_) < length) {
// TODO(toyoshim): buffer up the data to send at a later time.
// For now we're just dropping these bytes on the floor.
return;
}
unacknowledged_bytes_sent_ += length;
Vector<uint8_t> v;
v.Append(data, length);
GetMidiSession().SendData(port, std::move(v), timestamp);
}
void MIDIDispatcher::AddInputPort(midi::mojom::blink::PortInfoPtr info) {
inputs_.push_back(*info);
// Iterating over a copy of |accessors_| as callback could result in
// |accessors_| being modified. Applies to for-loops later in this file as
// well.
for (auto* accessor : AccessorList(accessors_)) {
accessor->DidAddInputPort(info->id, info->manufacturer, info->name,
info->version, info->state);
}
}
void MIDIDispatcher::AddOutputPort(midi::mojom::blink::PortInfoPtr info) {
outputs_.push_back(*info);
for (auto* accessor : AccessorList(accessors_)) {
accessor->DidAddOutputPort(info->id, info->manufacturer, info->name,
info->version, info->state);
}
}
void MIDIDispatcher::SetInputPortState(uint32_t port,
midi::mojom::blink::PortState state) {
if (inputs_[port].state == state)
return;
inputs_[port].state = state;
for (auto* accessor : AccessorList(accessors_))
accessor->DidSetInputPortState(port, state);
}
void MIDIDispatcher::SetOutputPortState(uint32_t port,
midi::mojom::blink::PortState state) {
if (outputs_[port].state == state)
return;
outputs_[port].state = state;
for (auto* accessor : AccessorList(accessors_))
accessor->DidSetOutputPortState(port, state);
}
void MIDIDispatcher::SessionStarted(midi::mojom::blink::Result result) {
TRACE_EVENT0("midi", "MIDIDispatcher::OnSessionStarted");
session_result_ = result;
// A for-loop using iterators does not work because |accessor| may touch
// |accessors_waiting_session_queue_| in callbacks.
while (!accessors_waiting_session_queue_.IsEmpty()) {
auto* accessor = accessors_waiting_session_queue_.back();
accessors_waiting_session_queue_.pop_back();
if (result == midi::mojom::blink::Result::OK) {
// Add the accessor's input and output ports.
for (const auto& info : inputs_) {
accessor->DidAddInputPort(info.id, info.manufacturer, info.name,
info.version, info.state);
}
for (const auto& info : outputs_) {
accessor->DidAddOutputPort(info.id, info.manufacturer, info.name,
info.version, info.state);
}
}
accessor->DidStartSession(result);
accessors_.push_back(accessor);
}
}
void MIDIDispatcher::AcknowledgeSentData(uint32_t bytes_sent) {
DCHECK_GE(unacknowledged_bytes_sent_, bytes_sent);
if (unacknowledged_bytes_sent_ >= bytes_sent)
unacknowledged_bytes_sent_ -= bytes_sent;
}
void MIDIDispatcher::DataReceived(uint32_t port,
const Vector<uint8_t>& data,
base::TimeTicks timestamp) {
TRACE_EVENT0("midi", "MIDIDispatcher::DataReceived");
DCHECK(!data.IsEmpty());
for (auto* accessor : AccessorList(accessors_))
accessor->DidReceiveMIDIData(port, &data[0], data.size(), timestamp);
}
midi::mojom::blink::MidiSessionProvider&
MIDIDispatcher::GetMidiSessionProvider() {
if (!midi_session_provider_) {
Platform::Current()->GetInterfaceProvider()->GetInterface(
mojo::MakeRequest(&midi_session_provider_));
}
return *midi_session_provider_;
}
midi::mojom::blink::MidiSession& MIDIDispatcher::GetMidiSession() {
DCHECK(midi_session_);
return *midi_session_;
}
} // namespace blink
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