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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 #ifndef CONTENT_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_ | |
6 #define CONTENT_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_ | |
7 | |
8 #include <map> | |
9 #include <vector> | |
10 | |
11 #include "base/memory/scoped_ptr.h" | |
12 #include "content/common/content_export.h" | |
13 #include "ipc/ipc_channel_proxy.h" | |
14 #include "media/midi/midi_port_info.h" | |
15 #include "third_party/WebKit/public/platform/WebMIDIAccessor.h" | |
16 #include "third_party/WebKit/public/platform/WebMIDIAccessorClient.h" | |
17 | |
18 namespace base { | |
19 class MessageLoopProxy; | |
20 } | |
21 | |
22 namespace content { | |
23 | |
24 // MessageFilter that handles MIDI messages. | |
25 class CONTENT_EXPORT MIDIMessageFilter | |
26 : public IPC::ChannelProxy::MessageFilter { | |
27 public: | |
28 explicit MIDIMessageFilter( | |
29 const scoped_refptr<base::MessageLoopProxy>& io_message_loop); | |
30 | |
31 // Each client registers for MIDI access here. | |
32 // If permission is granted, then the client's | |
33 // addInputPort() and addOutputPort() methods will be called, | |
34 // giving the client access to receive and send data. | |
35 void RequestAccess(WebKit::WebMIDIAccessorClient* client, int access); | |
36 void RemoveClient(WebKit::WebMIDIAccessorClient* client); | |
37 | |
38 // A client will only be able to call this method if it has a suitable | |
39 // output port (from addOutputPort()). | |
40 void SendMIDIData(int port, | |
41 const uint8* data, | |
42 size_t length, | |
43 double timestamp); | |
44 | |
45 // IO message loop associated with this message filter. | |
46 scoped_refptr<base::MessageLoopProxy> io_message_loop() const { | |
47 return io_message_loop_; | |
48 } | |
49 | |
50 protected: | |
51 virtual ~MIDIMessageFilter(); | |
52 | |
53 private: | |
54 // Sends an IPC message using |channel_|. | |
55 void Send(IPC::Message* message); | |
56 | |
57 // IPC::ChannelProxy::MessageFilter override. Called on |io_message_loop|. | |
58 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; | |
59 virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE; | |
60 virtual void OnFilterRemoved() OVERRIDE; | |
61 virtual void OnChannelClosing() OVERRIDE; | |
62 | |
63 // Called when the browser process has approved (or denied) access to | |
64 // MIDI hardware. | |
65 void OnAccessApproved(int client_id, | |
66 int access, | |
67 bool success, | |
68 media::MIDIPortInfoList inputs, | |
69 media::MIDIPortInfoList outputs); | |
70 | |
71 // Called when the browser process has sent MIDI data containing one or | |
72 // more messages. | |
73 void OnDataReceived(int port, | |
74 const std::vector<uint8>& data, | |
75 double timestamp); | |
76 | |
77 void HandleAccessApproved(int client_id, | |
78 int access, | |
79 bool success, | |
80 media::MIDIPortInfoList inputs, | |
81 media::MIDIPortInfoList outputs); | |
82 | |
83 void HandleDataReceived(int port, | |
84 const std::vector<uint8>& data, | |
85 double timestamp); | |
86 | |
87 void RequestAccessOnIOThread(int client_id, int access); | |
88 | |
89 void SendMIDIDataOnIOThread(int port, | |
90 const std::vector<uint8>& data, | |
91 double timestamp); | |
92 | |
93 WebKit::WebMIDIAccessorClient* GetClientFromId(int client_id); | |
94 | |
95 // IPC channel for Send(); must only be accessed on |io_message_loop_|. | |
96 IPC::Channel* channel_; | |
97 | |
98 // Message loop on which IPC calls are driven. | |
99 const scoped_refptr<base::MessageLoopProxy> io_message_loop_; | |
100 | |
101 // Keeps track of all MIDI clients. | |
102 // We map client to "client id" used to track permission. | |
103 // When access has been approved, we add the input and output ports to | |
104 // the client, allowing it to actually receive and send MIDI data. | |
105 typedef std::map<WebKit::WebMIDIAccessorClient*, int> ClientsMap; | |
106 ClientsMap clients_; | |
107 | |
108 // Dishes out client ids. | |
109 int next_available_id_; | |
110 | |
111 DISALLOW_COPY_AND_ASSIGN(MIDIMessageFilter); | |
112 }; | |
113 | |
114 } // namespace content | |
115 | |
116 #endif // CONTENT_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_ | |
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