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

Issue 1534273002: Switch to standard integer types in media/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: more Created 5 years 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 <stdint.h>
9
8 #include <deque> 10 #include <deque>
9 #include <vector> 11 #include <vector>
10 12
11 #include "base/basictypes.h" 13 #include "base/macros.h"
12 #include "media/midi/midi_export.h" 14 #include "media/midi/midi_export.h"
13 15
14 namespace media { 16 namespace media {
15 namespace midi { 17 namespace midi {
16 18
17 // A simple message splitter for possibly unsafe/corrupted MIDI data stream. 19 // A simple message splitter for possibly unsafe/corrupted MIDI data stream.
18 // This class allows you to: 20 // This class allows you to:
19 // - maintain fragmented MIDI message. 21 // - maintain fragmented MIDI message.
20 // - skip any invalid data sequence. 22 // - skip any invalid data sequence.
21 // - reorder MIDI messages so that "System Real Time Message", which can be 23 // - reorder MIDI messages so that "System Real Time Message", which can be
22 // inserted at any point of the byte stream, is placed at the boundary of 24 // inserted at any point of the byte stream, is placed at the boundary of
23 // complete MIDI messages. 25 // complete MIDI messages.
24 // - (Optional) reconstruct complete MIDI messages from data stream where 26 // - (Optional) reconstruct complete MIDI messages from data stream where
25 // MIDI status byte is abbreviated (a.k.a. "running status"). 27 // MIDI status byte is abbreviated (a.k.a. "running status").
26 // 28 //
27 // Example (pseudo message loop): 29 // Example (pseudo message loop):
28 // MidiMessageQueue queue(true); // true to support "running status" 30 // MidiMessageQueue queue(true); // true to support "running status"
29 // while (true) { 31 // while (true) {
30 // if (is_incoming_midi_data_available()) { 32 // if (is_incoming_midi_data_available()) {
31 // std::vector<uint8> incoming_data; 33 // std::vector<uint8_t> incoming_data;
32 // read_incoming_midi_data(&incoming_data) 34 // read_incoming_midi_data(&incoming_data)
33 // queue.Add(incoming_data); 35 // queue.Add(incoming_data);
34 // } 36 // }
35 // while (true) { 37 // while (true) {
36 // std::vector<uint8> next_message; 38 // std::vector<uint8_t> next_message;
37 // queue.Get(&next_message); 39 // queue.Get(&next_message);
38 // if (!next_message.empty()) 40 // if (!next_message.empty())
39 // dispatch(next_message); 41 // dispatch(next_message);
40 // } 42 // }
41 // } 43 // }
42 class MIDI_EXPORT MidiMessageQueue { 44 class MIDI_EXPORT MidiMessageQueue {
43 public: 45 public:
44 // Initializes the queue. Set true to |allow_running_status| to enable 46 // Initializes the queue. Set true to |allow_running_status| to enable
45 // "MIDI running status" reconstruction. 47 // "MIDI running status" reconstruction.
46 explicit MidiMessageQueue(bool allow_running_status); 48 explicit MidiMessageQueue(bool allow_running_status);
47 ~MidiMessageQueue(); 49 ~MidiMessageQueue();
48 50
49 // Enqueues |data| to the internal buffer. 51 // Enqueues |data| to the internal buffer.
50 void Add(const std::vector<uint8>& data); 52 void Add(const std::vector<uint8_t>& data);
51 void Add(const uint8* data, size_t length); 53 void Add(const uint8_t* data, size_t length);
52 54
53 // Fills the next complete MIDI message into |message|. If |message| is 55 // Fills the next complete MIDI message into |message|. If |message| is
54 // not empty, the data sequence falls into one of the following types of 56 // not empty, the data sequence falls into one of the following types of
55 // MIDI message. 57 // MIDI message.
56 // - Single "Channel Voice Message" (w/o "System Real Time Messages") 58 // - Single "Channel Voice Message" (w/o "System Real Time Messages")
57 // - Single "Channel Mode Message" (w/o "System Real Time Messages") 59 // - Single "Channel Mode Message" (w/o "System Real Time Messages")
58 // - Single "System Exclusive Message" (w/o "System Real Time Messages") 60 // - Single "System Exclusive Message" (w/o "System Real Time Messages")
59 // - Single "System Common Message" (w/o "System Real Time Messages") 61 // - Single "System Common Message" (w/o "System Real Time Messages")
60 // - Single "System Real Time message" 62 // - Single "System Real Time message"
61 // |message| is empty if there is no complete MIDI message any more. 63 // |message| is empty if there is no complete MIDI message any more.
62 void Get(std::vector<uint8>* message); 64 void Get(std::vector<uint8_t>* message);
63 65
64 private: 66 private:
65 std::deque<uint8> queue_; 67 std::deque<uint8_t> queue_;
66 std::vector<uint8> next_message_; 68 std::vector<uint8_t> next_message_;
67 const bool allow_running_status_; 69 const bool allow_running_status_;
68 DISALLOW_COPY_AND_ASSIGN(MidiMessageQueue); 70 DISALLOW_COPY_AND_ASSIGN(MidiMessageQueue);
69 }; 71 };
70 72
71 } // namespace midi 73 } // namespace midi
72 } // namespace media 74 } // namespace media
73 75
74 #endif // MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_ 76 #endif // MEDIA_MIDI_MIDI_MESSAGE_QUEUE_H_
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