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// Copyright (c) 2013 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 "content/renderer/media/midi_message_filter.h"
#include "base/bind.h"
#include "base/debug/trace_event.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/strings/utf_string_conversions.h"
#include "content/common/media/midi_messages.h"
#include "content/renderer/render_thread_impl.h"
#include "ipc/ipc_logging.h"
using media::MIDIPortInfoList;
using base::AutoLock;
namespace content {
MIDIMessageFilter::MIDIMessageFilter(
const scoped_refptr<base::MessageLoopProxy>& io_message_loop)
: channel_(NULL),
io_message_loop_(io_message_loop),
next_available_id_(0) {
}
MIDIMessageFilter::~MIDIMessageFilter() {}
void MIDIMessageFilter::Send(IPC::Message* message) {
DCHECK(io_message_loop_->BelongsToCurrentThread());
if (!channel_) {
delete message;
} else {
channel_->Send(message);
}
}
bool MIDIMessageFilter::OnMessageReceived(const IPC::Message& message) {
DCHECK(io_message_loop_->BelongsToCurrentThread());
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(MIDIMessageFilter, message)
IPC_MESSAGE_HANDLER(MIDIMsg_AccessApproved, OnAccessApproved)
IPC_MESSAGE_HANDLER(MIDIMsg_DataReceived, OnDataReceived)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void MIDIMessageFilter::OnFilterAdded(IPC::Channel* channel) {
DCHECK(io_message_loop_->BelongsToCurrentThread());
channel_ = channel;
}
void MIDIMessageFilter::OnFilterRemoved() {
DCHECK(io_message_loop_->BelongsToCurrentThread());
// Once removed, a filter will not be used again. At this time all
// delegates must be notified so they release their reference.
OnChannelClosing();
}
void MIDIMessageFilter::OnChannelClosing() {
DCHECK(io_message_loop_->BelongsToCurrentThread());
channel_ = NULL;
}
void MIDIMessageFilter::RequestAccess(
WebKit::WebMIDIAccessorClient* client, int access) {
// Generate and keep track of a "client id" which is sent to the browser
// to ask permission to talk to MIDI hardware.
// This id is handed back when we receive the answer in OnAccessApproved().
if (clients_.find(client) == clients_.end()) {
int client_id = next_available_id_++;
clients_[client] = client_id;
io_message_loop_->PostTask(FROM_HERE,
base::Bind(&MIDIMessageFilter::RequestAccessOnIOThread, this,
client_id, access));
}
}
void MIDIMessageFilter::RequestAccessOnIOThread(int client_id, int access) {
Send(new MIDIHostMsg_RequestAccess(client_id, access));
}
void MIDIMessageFilter::RemoveClient(WebKit::WebMIDIAccessorClient* client) {
ClientsMap::iterator i = clients_.find(client);
if (i != clients_.end())
clients_.erase(i);
}
// Received from browser.
void MIDIMessageFilter::OnAccessApproved(
int client_id,
int access,
bool success,
MIDIPortInfoList inputs,
MIDIPortInfoList outputs) {
// Handle on the main JS thread.
ChildThread::current()->message_loop()->PostTask(FROM_HERE,
base::Bind(&MIDIMessageFilter::HandleAccessApproved, this,
client_id, access, success, inputs, outputs));
}
void MIDIMessageFilter::HandleAccessApproved(
int client_id,
int access,
bool success,
MIDIPortInfoList inputs,
MIDIPortInfoList outputs) {
WebKit::WebMIDIAccessorClient* client = GetClientFromId(client_id);
if (!client)
return;
if (success) {
// Add the client's input and output ports.
for (size_t i = 0; i < inputs.size(); ++i) {
client->didAddInputPort(
UTF8ToUTF16(inputs[i].id),
UTF8ToUTF16(inputs[i].manufacturer),
UTF8ToUTF16(inputs[i].name),
UTF8ToUTF16(inputs[i].version));
}
for (size_t i = 0; i < outputs.size(); ++i) {
client->didAddOutputPort(
UTF8ToUTF16(outputs[i].id),
UTF8ToUTF16(outputs[i].manufacturer),
UTF8ToUTF16(outputs[i].name),
UTF8ToUTF16(outputs[i].version));
}
}
if (success)
client->didAllowAccess();
else
client->didBlockAccess();
}
WebKit::WebMIDIAccessorClient*
MIDIMessageFilter::GetClientFromId(int client_id) {
// Iterating like this seems inefficient, but in practice there generally
// will be very few clients (usually one). Additionally, this lookup
// usually happens one time during page load. So the performance hit is
// negligible.
for (ClientsMap::iterator i = clients_.begin(); i != clients_.end(); ++i) {
if ((*i).second == client_id)
return (*i).first;
}
return NULL;
}
void MIDIMessageFilter::OnDataReceived(int port,
const std::vector<uint8>& data,
double timestamp) {
TRACE_EVENT0("midi", "MIDIMessageFilter::OnDataReceived");
ChildThread::current()->message_loop()->PostTask(FROM_HERE,
base::Bind(&MIDIMessageFilter::HandleDataReceived, this,
port, data, timestamp));
}
void MIDIMessageFilter::HandleDataReceived(int port,
const std::vector<uint8>& data,
double timestamp) {
TRACE_EVENT0("midi", "MIDIMessageFilter::HandleDataReceived");
#if defined(OS_ANDROID)
// TODO(crogers): figure out why data() method does not compile on Android.
NOTIMPLEMENTED();
#else
for (ClientsMap::iterator i = clients_.begin(); i != clients_.end(); ++i)
(*i).first->didReceiveMIDIData(port, data.data(), data.size(), timestamp);
#endif
}
void MIDIMessageFilter::SendMIDIData(int port,
const uint8* data,
size_t length,
double timestamp) {
// TODO(crogers): we need more work to check the amount of data sent,
// throttle if necessary, and filter out the SYSEX messages if not
// approved. For now, we will not implement the sending of MIDI data.
NOTIMPLEMENTED();
// std::vector<uint8> v(data, data + length);
// io_message_loop_->PostTask(FROM_HERE,
// base::Bind(&MIDIMessageFilter::SendMIDIDataOnIOThread, this,
// port, v, timestamp));
}
void MIDIMessageFilter::SendMIDIDataOnIOThread(int port,
const std::vector<uint8>& data,
double timestamp) {
// Send to the browser.
Send(new MIDIHostMsg_SendData(port, data, timestamp));
}
} // namespace content
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