1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
//
// Programmer: Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Creation Date: Sun Mar 15 10:55:56 GMT-0800 1998
// Last Modified: Sun Mar 15 10:55:56 GMT-0800 1998
// Filename: ...sig/code/control/MidiFileWrite/MidiFileWrite.cpp
// Web Address: http://www-ccrma.stanford.edu/~craig/improv/src/MidiFileWrite.cpp
// Syntax: C++
//
// Description: The MidiFileWrite class will write out a Type 0 MidiFile.
// Used for recording MIDI data streams into Standard
// MIDI files.
//
#include "MidiFileWrite.h"
#include "SigTimer.h"
#include <assert.h>
//////////////////////////////
//
// MidiFileWrite::MidiFileWrite
// default value: startTime = -1
//
MidiFileWrite::MidiFileWrite(void) {
trackSize = 0;
lastPlayTime = 0;
midifile = NULL;
openQ = 0;
}
MidiFileWrite::MidiFileWrite(const char* aFilename, int startTime) {
trackSize = 0;
lastPlayTime = 0;
midifile = NULL;
openQ = 0;
setup(aFilename, startTime);
}
//////////////////////////////
//
// MidiFileWrite::~MidiFileWrite
//
MidiFileWrite::~MidiFileWrite() {
close();
}
//////////////////////////////
//
// MidiFileWrite::close
//
void MidiFileWrite::close(void) {
writeRaw(0, 0xff, 0x2f, 0); // end of track meta event
midifile->seekg(18);
midifile->writeBigEndian(trackSize);
midifile->close();
midifile = NULL;
openQ = 0;
}
//////////////////////////////
//
// MidiFileWrite::setup -- writes the Midi file header and
// prepares the midifile for writing of data
// default value: startTime = -1
//
void MidiFileWrite::setup(const char* aFilename, int startTime) {
if (openQ) {
close();
}
if (midifile != NULL) delete midifile;
midifile = new FileIO;
midifile->open(aFilename, std::ios::out);
// write the header chunk
*midifile << "MThd"; // file identification: MIDI file
midifile->writeBigEndian(6L); // size of header (always 6)
midifile->writeBigEndian((short)0); // format: type 0;
midifile->writeBigEndian((short)0); // num of tracks (always 0 for type 0)
midifile->writeBigEndian((short)1000); // divisions per quarter note
// write the track header
*midifile << "MTrk";
midifile->writeBigEndian(0xffffL); // the track size which will
// be corrected with close()
// the midifile stream is now setup for writing
// track events
openQ = 1;
start(); // start can be called later and will behave well
// as long as no track events have been written
}
//////////////////////////////
//
// MidiFileWrite::start
// default value: startTime = -1;
//
void MidiFileWrite::start(int startTime) {
if (startTime < 0) {
SigTimer localTime;
lastPlayTime = localTime.getTime();
} else {
lastPlayTime = startTime;
}
}
//////////////////////////////
//
// MidiFileWrite::writeAbsolute -- considers the time data
// to be the current time. It will generate a difference
// time with the previously stored last playing time.
//
void MidiFileWrite::writeAbsolute(int aTime, int command, int p1, int p2) {
writeVLValue(aTime - lastPlayTime);
writeRaw((uchar)command, (uchar)p1, (uchar)p2);
lastPlayTime = aTime;
}
void MidiFileWrite::writeAbsolute(int aTime, int command, int p1) {
writeVLValue(aTime - lastPlayTime);
writeRaw((uchar)command, (uchar)p1);
lastPlayTime = aTime;
}
void MidiFileWrite::writeAbsolute(int aTime, int command) {
writeVLValue(aTime - lastPlayTime);
writeRaw((uchar)command);
lastPlayTime = aTime;
}
//////////////////////////////
//
// MidiFileWrite::writeRaw -- write an event byte to the midifile
//
void MidiFileWrite::writeRaw(uchar aByte) {
assert(midifile != NULL);
*midifile << aByte;
trackSize++;
}
void MidiFileWrite::writeRaw(uchar aByte, uchar bByte) {
writeRaw(aByte);
writeRaw(bByte);
}
void MidiFileWrite::writeRaw(uchar aByte, uchar bByte, uchar cByte) {
writeRaw(aByte);
writeRaw(bByte);
writeRaw(cByte);
}
void MidiFileWrite::writeRaw(uchar aByte, uchar bByte, uchar cByte,
uchar dByte) {
writeRaw(aByte);
writeRaw(bByte);
writeRaw(cByte);
writeRaw(dByte);
}
void MidiFileWrite::writeRaw(uchar aByte, uchar bByte, uchar cByte,
uchar dByte, uchar eByte) {
writeRaw(aByte);
writeRaw(bByte);
writeRaw(cByte);
writeRaw(dByte);
writeRaw(eByte);
}
void MidiFileWrite::writeRaw(uchar* anArray, int arraySize) {
for (int i=0; i<arraySize; i++) {
writeRaw(anArray[i]);
}
}
//////////////////////////////
//
// MidiFileWrite::writeRelative -- cosiders the time data
// to be a delta time from the last input message.
//
void MidiFileWrite::writeRelative(int aTime, int command, int p1, int p2) {
writeVLValue(aTime);
writeRaw((uchar)command, (uchar)p1, (uchar)p2);
lastPlayTime += aTime;
}
void MidiFileWrite::writeRelative(int aTime, int command, int p1) {
writeVLValue(aTime);
writeRaw((uchar)command, (uchar)p1);
lastPlayTime += aTime;
}
void MidiFileWrite::writeRelative(int aTime, int command) {
writeVLValue(aTime);
writeRaw((uchar)command);
lastPlayTime += aTime;
}
//////////////////////////////
//
// MidiFileWrite::writeVLValue -- write a number to the midifile
// as a variable length value which segments a file into 7-bit
// values. Maximum size of aValue is 0x7fffffff
//
void MidiFileWrite::writeVLValue(long aValue) {
uchar bytes[5];
bytes[0] = (uchar)((aValue >> 28) & 0x7f); // most significant 5 bits
bytes[1] = (uchar)((aValue >> 21) & 0x7f); // next largest 7 bits
bytes[2] = (uchar)((aValue >> 14) & 0x7f);
bytes[3] = (uchar)((aValue >> 7) & 0x7f);
bytes[4] = (uchar)((aValue) & 0x7f); // least significant 7 bits
int start = 0;
while (start<5 && bytes[start] == 0) start++;
for (int i=start; i<4; i++) {
writeRaw((uchar)(bytes[i] | 0x80));
}
writeRaw(bytes[4]);
}
// md5sum: 251468fa23862745f0cf36f359bccc17 - MidiFileWrite.cpp =css= 20030102
|
