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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/renderer/media/midi_message_filter.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/debug/trace_event.h" | |
| 9 #include "base/message_loop/message_loop_proxy.h" | |
| 10 #include "base/strings/utf_string_conversions.h" | |
| 11 #include "content/common/media/midi_messages.h" | |
| 12 #include "content/renderer/render_thread_impl.h" | |
| 13 #include "ipc/ipc_logging.h" | |
| 14 | |
| 15 using media::MIDIPortInfoList; | |
| 16 using base::AutoLock; | |
| 17 | |
| 18 namespace content { | |
| 19 | |
| 20 MIDIMessageFilter::MIDIMessageFilter( | |
| 21 const scoped_refptr<base::MessageLoopProxy>& io_message_loop) | |
| 22 : channel_(NULL), | |
| 23 io_message_loop_(io_message_loop), | |
| 24 next_available_id_(0) { | |
| 25 } | |
| 26 | |
| 27 MIDIMessageFilter::~MIDIMessageFilter() {} | |
| 28 | |
| 29 void MIDIMessageFilter::Send(IPC::Message* message) { | |
| 30 DCHECK(io_message_loop_->BelongsToCurrentThread()); | |
| 31 if (!channel_) { | |
| 32 delete message; | |
| 33 } else { | |
| 34 channel_->Send(message); | |
| 35 } | |
| 36 } | |
| 37 | |
| 38 bool MIDIMessageFilter::OnMessageReceived(const IPC::Message& message) { | |
| 39 DCHECK(io_message_loop_->BelongsToCurrentThread()); | |
| 40 bool handled = true; | |
| 41 IPC_BEGIN_MESSAGE_MAP(MIDIMessageFilter, message) | |
| 42 IPC_MESSAGE_HANDLER(MIDIMsg_AccessApproved, OnAccessApproved) | |
| 43 IPC_MESSAGE_HANDLER(MIDIMsg_DataReceived, OnDataReceived) | |
| 44 IPC_MESSAGE_UNHANDLED(handled = false) | |
| 45 IPC_END_MESSAGE_MAP() | |
| 46 return handled; | |
| 47 } | |
| 48 | |
| 49 void MIDIMessageFilter::OnFilterAdded(IPC::Channel* channel) { | |
| 50 DCHECK(io_message_loop_->BelongsToCurrentThread()); | |
| 51 channel_ = channel; | |
| 52 } | |
| 53 | |
| 54 void MIDIMessageFilter::OnFilterRemoved() { | |
| 55 DCHECK(io_message_loop_->BelongsToCurrentThread()); | |
| 56 | |
| 57 // Once removed, a filter will not be used again. At this time all | |
| 58 // delegates must be notified so they release their reference. | |
| 59 OnChannelClosing(); | |
| 60 } | |
| 61 | |
| 62 void MIDIMessageFilter::OnChannelClosing() { | |
| 63 DCHECK(io_message_loop_->BelongsToCurrentThread()); | |
| 64 channel_ = NULL; | |
| 65 } | |
| 66 | |
| 67 void MIDIMessageFilter::RequestAccess( | |
| 68 WebKit::WebMIDIAccessorClient* client, int access) { | |
| 69 // Generate and keep track of a "client id" which is sent to the browser | |
| 70 // to ask permission to talk to MIDI hardware. | |
| 71 // This id is handed back when we receive the answer in OnAccessApproved(). | |
| 72 if (clients_.find(client) == clients_.end()) { | |
| 73 int client_id = next_available_id_++; | |
| 74 clients_[client] = client_id; | |
| 75 | |
| 76 io_message_loop_->PostTask(FROM_HERE, | |
| 77 base::Bind(&MIDIMessageFilter::RequestAccessOnIOThread, this, | |
| 78 client_id, access)); | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 void MIDIMessageFilter::RequestAccessOnIOThread(int client_id, int access) { | |
| 83 Send(new MIDIHostMsg_RequestAccess(client_id, access)); | |
| 84 } | |
| 85 | |
| 86 void MIDIMessageFilter::RemoveClient(WebKit::WebMIDIAccessorClient* client) { | |
| 87 ClientsMap::iterator i = clients_.find(client); | |
| 88 if (i != clients_.end()) | |
| 89 clients_.erase(i); | |
| 90 } | |
| 91 | |
| 92 // Received from browser. | |
| 93 | |
| 94 void MIDIMessageFilter::OnAccessApproved( | |
| 95 int client_id, | |
| 96 int access, | |
| 97 bool success, | |
| 98 MIDIPortInfoList inputs, | |
| 99 MIDIPortInfoList outputs) { | |
| 100 // Handle on the main JS thread. | |
| 101 ChildThread::current()->message_loop()->PostTask(FROM_HERE, | |
| 102 base::Bind(&MIDIMessageFilter::HandleAccessApproved, this, | |
| 103 client_id, access, success, inputs, outputs)); | |
| 104 } | |
| 105 | |
| 106 void MIDIMessageFilter::HandleAccessApproved( | |
| 107 int client_id, | |
| 108 int access, | |
| 109 bool success, | |
| 110 MIDIPortInfoList inputs, | |
| 111 MIDIPortInfoList outputs) { | |
| 112 WebKit::WebMIDIAccessorClient* client = GetClientFromId(client_id); | |
| 113 if (!client) | |
| 114 return; | |
| 115 | |
| 116 if (success) { | |
| 117 // Add the client's input and output ports. | |
| 118 for (size_t i = 0; i < inputs.size(); ++i) { | |
| 119 client->didAddInputPort( | |
| 120 UTF8ToUTF16(inputs[i].id), | |
| 121 UTF8ToUTF16(inputs[i].manufacturer), | |
| 122 UTF8ToUTF16(inputs[i].name), | |
| 123 UTF8ToUTF16(inputs[i].version)); | |
| 124 } | |
| 125 | |
| 126 for (size_t i = 0; i < outputs.size(); ++i) { | |
| 127 client->didAddOutputPort( | |
| 128 UTF8ToUTF16(outputs[i].id), | |
| 129 UTF8ToUTF16(outputs[i].manufacturer), | |
| 130 UTF8ToUTF16(outputs[i].name), | |
| 131 UTF8ToUTF16(outputs[i].version)); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 if (success) | |
| 136 client->didAllowAccess(); | |
| 137 else | |
| 138 client->didBlockAccess(); | |
| 139 } | |
| 140 | |
| 141 WebKit::WebMIDIAccessorClient* | |
| 142 MIDIMessageFilter::GetClientFromId(int client_id) { | |
| 143 // Iterating like this seems inefficient, but in practice there generally | |
| 144 // will be very few clients (usually one). Additionally, this lookup | |
| 145 // usually happens one time during page load. So the performance hit is | |
| 146 // negligible. | |
| 147 for (ClientsMap::iterator i = clients_.begin(); i != clients_.end(); ++i) { | |
| 148 if ((*i).second == client_id) | |
| 149 return (*i).first; | |
| 150 } | |
| 151 return NULL; | |
| 152 } | |
| 153 | |
| 154 void MIDIMessageFilter::OnDataReceived(int port, | |
| 155 const std::vector<uint8>& data, | |
| 156 double timestamp) { | |
| 157 TRACE_EVENT0("midi", "MIDIMessageFilter::OnDataReceived"); | |
| 158 | |
| 159 ChildThread::current()->message_loop()->PostTask(FROM_HERE, | |
| 160 base::Bind(&MIDIMessageFilter::HandleDataReceived, this, | |
| 161 port, data, timestamp)); | |
| 162 } | |
| 163 | |
| 164 void MIDIMessageFilter::HandleDataReceived(int port, | |
| 165 const std::vector<uint8>& data, | |
| 166 double timestamp) { | |
| 167 TRACE_EVENT0("midi", "MIDIMessageFilter::HandleDataReceived"); | |
| 168 | |
| 169 #if defined(OS_ANDROID) | |
| 170 // TODO(crogers): figure out why data() method does not compile on Android. | |
| 171 NOTIMPLEMENTED(); | |
| 172 #else | |
| 173 for (ClientsMap::iterator i = clients_.begin(); i != clients_.end(); ++i) | |
| 174 (*i).first->didReceiveMIDIData(port, data.data(), data.size(), timestamp); | |
| 175 #endif | |
| 176 } | |
| 177 | |
| 178 void MIDIMessageFilter::SendMIDIData(int port, | |
| 179 const uint8* data, | |
| 180 size_t length, | |
| 181 double timestamp) { | |
| 182 // TODO(crogers): we need more work to check the amount of data sent, | |
| 183 // throttle if necessary, and filter out the SYSEX messages if not | |
| 184 // approved. For now, we will not implement the sending of MIDI data. | |
| 185 NOTIMPLEMENTED(); | |
| 186 // std::vector<uint8> v(data, data + length); | |
| 187 // io_message_loop_->PostTask(FROM_HERE, | |
| 188 // base::Bind(&MIDIMessageFilter::SendMIDIDataOnIOThread, this, | |
| 189 // port, v, timestamp)); | |
| 190 } | |
| 191 | |
| 192 void MIDIMessageFilter::SendMIDIDataOnIOThread(int port, | |
| 193 const std::vector<uint8>& data, | |
| 194 double timestamp) { | |
| 195 // Send to the browser. | |
| 196 Send(new MIDIHostMsg_SendData(port, data, timestamp)); | |
| 197 } | |
| 198 | |
| 199 } // namespace content | |
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Chromium Code Reviews
Issue 17334006:
Revert 207983 "Implement Web MIDI API back-end" (Closed)
Base URL: svn://svn.chromium.org/chrome/