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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_MIDI_MESSAGE_UTIL_H_
- #define MEDIA_MIDI_MESSAGE_UTIL_H_
- #include <stddef.h>
- #include <stdint.h>
- #include <vector>
- #include "media/midi/midi_export.h"
- namespace midi {
- // Returns the length of a MIDI message in bytes. Never returns 4 or greater.
- // Returns 0 if |status_byte| is:
- // - not a valid status byte, namely data byte.
- // - MIDI System Exclusive message.
- // - End of System Exclusive message.
- // - Reserved System Common Message (0xf4, 0xf5)
- MIDI_EXPORT size_t GetMessageLength(uint8_t status_byte);
- // Checks if the specified byte is a valid data byte.
- MIDI_EXPORT bool IsDataByte(uint8_t data);
- // Checks if the specified byte is a valid system real time message.
- MIDI_EXPORT bool IsSystemRealTimeMessage(uint8_t data);
- // Checks if the specified byte is a valid system message.
- MIDI_EXPORT bool IsSystemMessage(uint8_t data);
- // Checks if |data| fulfills the requirements of MidiOutput.send API that is
- // defined in the Web MIDI spec.
- // - |data| must be any number of complete MIDI messages (data abbreviation
- // called "running status" is disallowed).
- // - 1-byte MIDI realtime messages can be placed at any position of |data|.
- MIDI_EXPORT bool IsValidWebMIDIData(const std::vector<uint8_t>& data);
- const uint8_t kSysExByte = 0xf0;
- const uint8_t kEndOfSysExByte = 0xf7;
- const uint8_t kSysMessageBitMask = 0xf0;
- const uint8_t kSysMessageBitPattern = 0xf0;
- const uint8_t kSysRTMessageBitMask = 0xf8;
- const uint8_t kSysRTMessageBitPattern = 0xf8;
- } // namespace midi
- #endif // MEDIA_MIDI_MESSAGE_UTIL_H_
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