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// Copyright 2018 The Chromium Authors
// 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 <utility>
#include "base/trace_event/trace_event.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "third_party/blink/public/common/thread_safe_browser_interface_broker_proxy.h"
#include "third_party/blink/public/platform/browser_interface_broker_proxy.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.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(ExecutionContext* execution_context)
: midi_session_(execution_context),
receiver_(this, execution_context),
midi_session_provider_(execution_context) {
TRACE_EVENT0("midi", "MIDIDispatcher::MIDIDispatcher");
// See https://bit.ly/2S0zRAS for task types.
execution_context->GetBrowserInterfaceBroker().GetInterface(
midi_session_provider_.BindNewPipeAndPassReceiver(
execution_context->GetTaskRunner(blink::TaskType::kMiscPlatformAPI)));
midi_session_provider_->StartSession(
midi_session_.BindNewPipeAndPassReceiver(
execution_context->GetTaskRunner(blink::TaskType::kMiscPlatformAPI)),
receiver_.BindNewPipeAndPassRemote(
execution_context->GetTaskRunner(blink::TaskType::kMiscPlatformAPI)));
}
MIDIDispatcher::~MIDIDispatcher() = default;
void MIDIDispatcher::SendMIDIData(uint32_t port,
base::span<const uint8_t> data,
base::TimeTicks timestamp) {
if ((kMaxUnacknowledgedBytesSent - unacknowledged_bytes_sent_) <
data.size()) {
// 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_ += data.size();
Vector<uint8_t> v;
v.AppendSpan(data);
midi_session_->SendData(port, std::move(v), timestamp);
}
void MIDIDispatcher::AddInputPort(midi::mojom::blink::PortInfoPtr info) {
DCHECK(client_);
inputs_.push_back(*info);
if (initialized_) {
client_->DidAddInputPort(info->id, info->manufacturer, info->name,
info->version, info->state);
}
}
void MIDIDispatcher::AddOutputPort(midi::mojom::blink::PortInfoPtr info) {
DCHECK(client_);
outputs_.push_back(*info);
if (initialized_) {
client_->DidAddOutputPort(info->id, info->manufacturer, info->name,
info->version, info->state);
}
}
void MIDIDispatcher::SetInputPortState(uint32_t port,
midi::mojom::blink::PortState state) {
DCHECK(client_);
if (inputs_[port].state == state)
return;
inputs_[port].state = state;
if (initialized_)
client_->DidSetInputPortState(port, state);
}
void MIDIDispatcher::SetOutputPortState(uint32_t port,
midi::mojom::blink::PortState state) {
DCHECK(client_);
if (outputs_[port].state == state)
return;
outputs_[port].state = state;
if (initialized_)
client_->DidSetOutputPortState(port, state);
}
void MIDIDispatcher::SessionStarted(midi::mojom::blink::Result result) {
TRACE_EVENT0("midi", "MIDIDispatcher::OnSessionStarted");
// We always have a valid instance in `client_` in the production code, but
// just in case to be robust for mojo injections and code changes in the
// future. Other methods protect accesses to `client_` by `initialized_` flag
// that is set below.
SECURITY_CHECK(client_);
DCHECK(!initialized_);
initialized_ = true;
if (result == midi::mojom::blink::Result::OK) {
// Add the accessor's input and output ports.
for (const auto& info : inputs_) {
client_->DidAddInputPort(info.id, info.manufacturer, info.name,
info.version, info.state);
}
for (const auto& info : outputs_) {
client_->DidAddOutputPort(info.id, info.manufacturer, info.name,
info.version, info.state);
}
}
client_->DidStartSession(result);
}
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) {
DCHECK(client_);
TRACE_EVENT0("midi", "MIDIDispatcher::DataReceived");
DCHECK(!data.empty());
if (initialized_)
client_->DidReceiveMIDIData(port, data, timestamp);
}
void MIDIDispatcher::Trace(Visitor* visitor) const {
visitor->Trace(client_);
visitor->Trace(midi_session_);
visitor->Trace(receiver_);
visitor->Trace(midi_session_provider_);
}
} // namespace blink
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