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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 | |
17 namespace base { | |
18 class MessageLoopProxy; | |
19 } | |
20 | |
21 namespace content { | |
22 | |
23 // MessageFilter that handles MIDI messages. | |
24 class CONTENT_EXPORT MIDIMessageFilter | |
25 : public IPC::ChannelProxy::MessageFilter { | |
26 public: | |
27 explicit MIDIMessageFilter( | |
28 const scoped_refptr<base::MessageLoopProxy>& io_message_loop); | |
29 | |
30 // Each client registers for MIDI access here. | |
31 // If permission is granted, then the client's | |
32 // addInputPort() and addOutputPort() methods will be called, | |
33 // giving the client access to receive and send data. | |
34 void RequestAccess(WebKit::WebMIDIAccessor::Client* client, int access); | |
35 void RemoveClient(WebKit::WebMIDIAccessor::Client* client); | |
36 | |
37 // A client will only be able to call this method if it has a suitable | |
38 // output port (from addOutputPort()). | |
39 void SendMIDIData(int port_index, | |
40 const uint8* data, | |
41 size_t length, | |
42 double timestamp); | |
43 | |
44 // IO message loop associated with this message filter. | |
45 scoped_refptr<base::MessageLoopProxy> io_message_loop() const { | |
46 return io_message_loop_; | |
47 } | |
48 | |
49 protected: | |
50 virtual ~MIDIMessageFilter(); | |
51 | |
52 private: | |
53 // Sends an IPC message using |channel_|. | |
54 void Send(IPC::Message* message); | |
55 | |
56 // IPC::ChannelProxy::MessageFilter override. Called on |io_message_loop|. | |
57 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; | |
58 virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE; | |
59 virtual void OnFilterRemoved() OVERRIDE; | |
60 virtual void OnChannelClosing() OVERRIDE; | |
61 | |
62 // Called when the browser process has approved (or denied) access to | |
63 // MIDI hardware. | |
64 void OnAccessApproved(int client_id, | |
65 int access, | |
66 bool success, | |
67 media::MIDIPortInfoList inputs, | |
68 media::MIDIPortInfoList outputs); | |
69 | |
70 // Called when the browser process has sent MIDI data containing one or | |
71 // more messages. | |
72 void OnDataReceived(int port, | |
73 const std::vector<uint8>& data, | |
74 double timestamp); | |
75 | |
76 void HandleAccessApproved(int client_id, | |
77 int access, | |
78 bool success, | |
79 media::MIDIPortInfoList inputs, | |
80 media::MIDIPortInfoList outputs); | |
81 | |
82 void HandleDataReceived(int port, | |
83 const std::vector<uint8>& data, | |
84 double timestamp); | |
85 | |
86 WebKit::WebMIDIAccessor::Client* GetClientFromId(int client_id); | |
87 | |
88 // IPC channel for Send(); must only be accessed on |io_message_loop_|. | |
89 IPC::Channel* channel_; | |
90 | |
91 // Message loop on which IPC calls are driven. | |
92 const scoped_refptr<base::MessageLoopProxy> io_message_loop_; | |
93 | |
94 // Keeps track of all MIDI clients. | |
95 // We map client to "client id" used to track permission. | |
96 // When access has been approved, we add the input and output ports to | |
97 // the client, allowing it to actually receive and send MIDI data. | |
98 typedef std::map<WebKit::WebMIDIAccessor::Client*, int> ClientsMap; | |
99 ClientsMap clients_; | |
100 | |
101 // Dishes out client ids. | |
102 static int next_available_id_; | |
103 | |
104 // Protects access to our clients. | |
105 base::Lock clients_lock_; | |
106 | |
107 base::MessageLoop* client_message_loop_; | |
scherkus (not reviewing)
2013/06/12 01:28:47
is it possible to use scoped_refptr<base::MessageL
Chris Rogers
2013/06/12 20:34:35
Done.
| |
108 | |
109 DISALLOW_COPY_AND_ASSIGN(MIDIMessageFilter); | |
110 }; | |
111 | |
112 } // namespace content | |
113 | |
114 #endif // CONTENT_RENDERER_MEDIA_MIDI_MESSAGE_FILTER_H_ | |
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