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Side by Side Diff: media/midi/midi_message_queue.h

Issue 1121363002: GN Windows component build fixes (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@component2
Patch Set: . Created 5 years, 7 months ago
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1 // Copyright 2013 The Chromium Authors. All rights reserved. 1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_ 5 #ifndef MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_
6 #define MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_ 6 #define MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_
7 7
8 #include <deque> 8 #include <deque>
9 #include <vector> 9 #include <vector>
10 10
11 #include "base/basictypes.h" 11 #include "base/basictypes.h"
12 #include "media/base/media_export.h" 12 #include "media/midi/midi_export.h"
13 13
14 namespace media { 14 namespace media {
15 15
16 // A simple message splitter for possibly unsafe/corrupted MIDI data stream. 16 // A simple message splitter for possibly unsafe/corrupted MIDI data stream.
17 // This class allows you to: 17 // This class allows you to:
18 // - maintain fragmented MIDI message. 18 // - maintain fragmented MIDI message.
19 // - skip any invalid data sequence. 19 // - skip any invalid data sequence.
20 // - reorder MIDI messages so that "System Real Time Message", which can be 20 // - reorder MIDI messages so that "System Real Time Message", which can be
21 // inserted at any point of the byte stream, is placed at the boundary of 21 // inserted at any point of the byte stream, is placed at the boundary of
22 // complete MIDI messages. 22 // complete MIDI messages.
23 // - (Optional) reconstruct complete MIDI messages from data stream where 23 // - (Optional) reconstruct complete MIDI messages from data stream where
24 // MIDI status byte is abbreviated (a.k.a. "running status"). 24 // MIDI status byte is abbreviated (a.k.a. "running status").
25 // 25 //
26 // Example (pseudo message loop): 26 // Example (pseudo message loop):
27 // MidiMessageQueue queue(true); // true to support "running status" 27 // MidiMessageQueue queue(true); // true to support "running status"
28 // while (true) { 28 // while (true) {
29 // if (is_incoming_midi_data_available()) { 29 // if (is_incoming_midi_data_available()) {
30 // std::vector<uint8> incoming_data; 30 // std::vector<uint8> incoming_data;
31 // read_incoming_midi_data(&incoming_data) 31 // read_incoming_midi_data(&incoming_data)
32 // queue.Add(incoming_data); 32 // queue.Add(incoming_data);
33 // } 33 // }
34 // while (true) { 34 // while (true) {
35 // std::vector<uint8> next_message; 35 // std::vector<uint8> next_message;
36 // queue.Get(&next_message); 36 // queue.Get(&next_message);
37 // if (!next_message.empty()) 37 // if (!next_message.empty())
38 // dispatch(next_message); 38 // dispatch(next_message);
39 // } 39 // }
40 // } 40 // }
41 class MEDIA_EXPORT MidiMessageQueue { 41 class MIDI_EXPORT MidiMessageQueue {
42 public: 42 public:
43 // Initializes the queue. Set true to |allow_running_status| to enable 43 // Initializes the queue. Set true to |allow_running_status| to enable
44 // "MIDI running status" reconstruction. 44 // "MIDI running status" reconstruction.
45 explicit MidiMessageQueue(bool allow_running_status); 45 explicit MidiMessageQueue(bool allow_running_status);
46 ~MidiMessageQueue(); 46 ~MidiMessageQueue();
47 47
48 // Enqueues |data| to the internal buffer. 48 // Enqueues |data| to the internal buffer.
49 void Add(const std::vector<uint8>& data); 49 void Add(const std::vector<uint8>& data);
50 void Add(const uint8* data, size_t length); 50 void Add(const uint8* data, size_t length);
51 51
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63 private: 63 private:
64 std::deque<uint8> queue_; 64 std::deque<uint8> queue_;
65 std::vector<uint8> next_message_; 65 std::vector<uint8> next_message_;
66 const bool allow_running_status_; 66 const bool allow_running_status_;
67 DISALLOW_COPY_AND_ASSIGN(MidiMessageQueue); 67 DISALLOW_COPY_AND_ASSIGN(MidiMessageQueue);
68 }; 68 };
69 69
70 } // namespace media 70 } // namespace media
71 71
72 #endif // MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_ 72 #endif // MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_
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