OpenShot Audio Library | OpenShotAudio: juce_MidiDataConcatenator.h Source File

OpenShot Audio Library | OpenShotAudio 0.6.0

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juce_MidiDataConcatenator.h
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2022 - Raw Material Software Limited
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23namespace juce
24{
25
26//==============================================================================
33 class MidiDataConcatenator
34{
35public:
36 MidiDataConcatenator (int initialBufferSize)
37 : pendingSysexData ((size_t) initialBufferSize)
38 {
39 }
40
41 void reset()
42 {
43 currentMessageLen = 0;
44 pendingSysexSize = 0;
45 pendingSysexTime = 0;
46 }
47
48 template <typename UserDataType, typename CallbackType>
49 void pushMidiData (const void* inputData, int numBytes, double time,
50 UserDataType* input, CallbackType& callback)
51 {
52 auto d = static_cast<const uint8*> (inputData);
53
54 while (numBytes > 0)
55 {
56 auto nextByte = *d;
57
58 if (pendingSysexSize != 0 || nextByte == 0xf0)
59 {
60 processSysex (d, numBytes, time, input, callback);
61 currentMessageLen = 0;
62 continue;
63 }
64
65 ++d;
66 --numBytes;
67
68 if (isRealtimeMessage (nextByte))
69 {
70 callback.handleIncomingMidiMessage (input, MidiMessage (nextByte, time));
71 // These can be embedded in the middle of a normal message, so we won't
72 // reset the currentMessageLen here.
73 continue;
74 }
75
76 if (isInitialByte (nextByte))
77 {
78 currentMessage[0] = nextByte;
79 currentMessageLen = 1;
80 }
81 else if (currentMessageLen > 0 && currentMessageLen < 3)
82 {
83 currentMessage[currentMessageLen++] = nextByte;
84 }
85 else
86 {
87 // message is too long or invalid MIDI - abandon it and start again with the next byte
88 currentMessageLen = 0;
89 continue;
90 }
91
92 auto expectedLength = MidiMessage::getMessageLengthFromFirstByte (currentMessage[0]);
93
94 if (expectedLength == currentMessageLen)
95 {
96 callback.handleIncomingMidiMessage (input, MidiMessage (currentMessage, expectedLength, time));
97 currentMessageLen = 1; // reset, but leave the first byte to use as the running status byte
98 }
99 }
100 }
101
102private:
103 template <typename UserDataType, typename CallbackType>
104 void processSysex (const uint8*& d, int& numBytes, double time,
105 UserDataType* input, CallbackType& callback)
106 {
107 if (*d == 0xf0)
108 {
109 pendingSysexSize = 0;
110 pendingSysexTime = time;
111 }
112
113 pendingSysexData.ensureSize ((size_t) (pendingSysexSize + numBytes), false);
114 auto totalMessage = static_cast<uint8*> (pendingSysexData.getData());
115 auto dest = totalMessage + pendingSysexSize;
116
117 do
118 {
119 if (pendingSysexSize > 0 && isStatusByte (*d))
120 {
121 if (*d == 0xf7)
122 {
123 *dest++ = *d++;
124 ++pendingSysexSize;
125 --numBytes;
126 break;
127 }
128
129 if (*d >= 0xfa || *d == 0xf8)
130 {
131 callback.handleIncomingMidiMessage (input, MidiMessage (*d, time));
132 ++d;
133 --numBytes;
134 }
135 else
136 {
137 pendingSysexSize = 0;
138 int used = 0;
139 const MidiMessage m (d, numBytes, used, 0, time);
140
141 if (used > 0)
142 {
143 callback.handleIncomingMidiMessage (input, m);
144 numBytes -= used;
145 d += used;
146 }
147
148 break;
149 }
150 }
151 else
152 {
153 *dest++ = *d++;
154 ++pendingSysexSize;
155 --numBytes;
156 }
157 }
158 while (numBytes > 0);
159
160 if (pendingSysexSize > 0)
161 {
162 if (totalMessage [pendingSysexSize - 1] == 0xf7)
163 {
164 callback.handleIncomingMidiMessage (input, MidiMessage (totalMessage, pendingSysexSize, pendingSysexTime));
165 pendingSysexSize = 0;
166 }
167 else
168 {
169 callback.handlePartialSysexMessage (input, totalMessage, pendingSysexSize, pendingSysexTime);
170 }
171 }
172 }
173
174 static bool isRealtimeMessage (uint8 byte) { return byte >= 0xf8 && byte <= 0xfe; }
175 static bool isStatusByte (uint8 byte) { return byte >= 0x80; }
176 static bool isInitialByte (uint8 byte) { return isStatusByte (byte) && byte != 0xf7; }
177
178 uint8 currentMessage[3];
179 int currentMessageLen = 0;
180
181 MemoryBlock pendingSysexData;
182 double pendingSysexTime = 0;
183 int pendingSysexSize = 0;
184
185 JUCE_DECLARE_NON_COPYABLE (MidiDataConcatenator)
186};
187
188} // namespace juce
juce::MemoryBlock
Definition juce_MemoryBlock.h:33
juce::MidiMessage
Definition juce_MidiMessage.h:35
juce::MidiMessage::getMessageLengthFromFirstByte
static int getMessageLengthFromFirstByte(uint8 firstByte) noexcept
Definition juce_MidiMessage.cpp:104