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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_MIDI_MESSAGE_UTIL_H_ |
| 6 #define MEDIA_MIDI_MESSAGE_UTIL_H_ |
| 7 |
| 8 #include <stddef.h> |
| 9 #include <stdint.h> |
| 10 |
| 11 #include <deque> |
| 12 #include <vector> |
| 13 |
| 14 #include "media/midi/midi_export.h" |
| 15 |
| 16 namespace midi { |
| 17 |
| 18 // Returns the length of a MIDI message in bytes. Never returns 4 or greater. |
| 19 // Returns 0 if |status_byte| is: |
| 20 // - not a valid status byte, namely data byte. |
| 21 // - MIDI System Exclusive message. |
| 22 // - End of System Exclusive message. |
| 23 // - Reserved System Common Message (0xf4, 0xf5) |
| 24 MIDI_EXPORT size_t GetMessageLength(uint8_t status_byte); |
| 25 |
| 26 // Checks if the specified byte is a valid data byte. |
| 27 MIDI_EXPORT bool IsDataByte(uint8_t data); |
| 28 |
| 29 // Checks if the specified byte is a valid system real time message. |
| 30 MIDI_EXPORT bool IsSystemRealTimeMessage(uint8_t data); |
| 31 |
| 32 // Checks if the specified byte is a valid system message. |
| 33 MIDI_EXPORT bool IsSystemMessage(uint8_t data); |
| 34 |
| 35 // Checks if |data| fulfills the requirements of MidiOutput.send API that is |
| 36 // defined in the Web MIDI spec. |
| 37 // - |data| must be any number of complete MIDI messages (data abbreviation |
| 38 // called "running status" is disallowed). |
| 39 // - 1-byte MIDI realtime messages can be placed at any position of |data|. |
| 40 MIDI_EXPORT bool IsValidWebMIDIData(const std::vector<uint8_t>& data); |
| 41 |
| 42 const uint8_t kSysExByte = 0xf0; |
| 43 const uint8_t kEndOfSysExByte = 0xf7; |
| 44 |
| 45 const uint8_t kSysMessageBitMask = 0xf0; |
| 46 const uint8_t kSysMessageBitPattern = 0xf0; |
| 47 const uint8_t kSysRTMessageBitMask = 0xf8; |
| 48 const uint8_t kSysRTMessageBitPattern = 0xf8; |
| 49 |
| 50 } // namespace midi |
| 51 |
| 52 #endif // MEDIA_MIDI_MESSAGE_UTIL_H_ |
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