Jack2: midi_unpack.h Source File

Jack2 1.9.12

midi_unpack.h
1 /*
2 * Copyright (c) 2006,2007 Dmitry S. Baikov
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19 #ifndef __jack_midi_unpack_h__
20 #define __jack_midi_unpack_h__
21
22 enum {
23 MIDI_UNPACK_MAX_MSG = 1024
24 };
25
26 typedef struct
27 {
28 int pos, need, size;
29 unsigned char data[MIDI_UNPACK_MAX_MSG];
30 }
31 midi_unpack_t;
32
33 static inline
34 void midi_unpack_init(midi_unpack_t *u)
35 {
36 u->pos = 0;
37 u->size = sizeof(u->data);
38 u->need = u->size;
39 }
40
41 static inline
42 void midi_unpack_reset(midi_unpack_t *u)
43 {
44 u->pos = 0;
45 u->need = u->size;
46 }
47
48 static const unsigned char midi_voice_len[] =
49 {
50 3, /*0x80 Note Off*/
51 3, /*0x90 Note On*/
52 3, /*0xA0 Aftertouch*/
53 3, /*0xB0 Control Change*/
54 2, /*0xC0 Program Change*/
55 2, /*0xD0 Channel Pressure*/
56 3, /*0xE0 Pitch Wheel*/
57 1 /*0xF0 System*/
58 };
59
60 static const unsigned char midi_system_len[] =
61 {
62 0, /*0xF0 System Exclusive Start*/
63 2, /*0xF1 MTC Quarter Frame*/
64 3, /*0xF2 Song Postion*/
65 2, /*0xF3 Song Select*/
66 0, /*0xF4 undefined*/
67 0, /*0xF5 undefined*/
68 1, /*0xF6 Tune Request*/
69 1 /*0xF7 System Exlusive End*/
70 };
71
72 static
73 int midi_unpack_buf(midi_unpack_t *buf, const unsigned char *data, int len, void *jack_port_buf, jack_nframes_t time)
74 {
75 int i;
76 for (i = 0; i < len; ++i) {
77 const unsigned char byte = data[i];
78 if (byte >= 0xF8) // system realtime
79 {
80 jack_midi_event_write(jack_port_buf, time, &data[i], 1);
81 //printf("midi_unpack: written system relatime event\n");
82 //midi_input_write(in, &data[i], 1);
83 } else if (byte < 0x80) // data
84 {
85 assert (buf->pos < buf->size);
86 buf->data[buf->pos++] = byte;
87 } else if (byte < 0xF0) // voice
88 {
89 assert (byte >= 0x80 && byte < 0xF0);
90 //buf->need = ((byte|0x0F) == 0xCF || (byte|0x0F)==0xDF) ? 2 : 3;
91 buf->need = midi_voice_len[(byte-0x80)>>4];
92 buf->data[0] = byte;
93 buf->pos = 1;
94 } else if (byte == 0xF7) // sysex end
95 {
96 assert (buf->pos < buf->size);
97 buf->data[buf->pos++] = byte;
98 buf->need = buf->pos;
99 } else {
100 assert (byte >= 0xF0 && byte < 0xF8);
101 buf->pos = 1;
102 buf->data[0] = byte;
103 buf->need = midi_system_len[byte - 0xF0];
104 if (!buf->need)
105 buf->need = buf->size;
106 }
107 if (buf->pos == buf->need) {
108 // TODO: deal with big sysex'es (they are silently dropped for now)
109 if (buf->data[0] >= 0x80 || (buf->data[0] == 0xF0 && buf->data[buf->pos-1] == 0xF7)) {
110 /* convert Note On with velocity 0 to Note Off */
111 if ((buf->data[0] & 0xF0) == 0x90 && buf->data[2] == 0) {
112 // we use temp array here to keep running status sync
113 jack_midi_data_t temp[3] = { 0x80, 0, 0x40 };
114 temp[0] |= buf->data[0] & 0x0F;
115 temp[1] = buf->data[1];
116 jack_midi_event_write(jack_port_buf, time, temp, 3);
117 } else
118 jack_midi_event_write(jack_port_buf, time, &buf->data[0], buf->pos);
119 //printf("midi_unpack: written %d-byte event\n", buf->pos);
120 //midi_input_write(in, &buf->data[0], buf->pos);
121 }
122 /* keep running status */
123 if (buf->data[0] >= 0x80 && buf->data[0] < 0xF0)
124 buf->pos = 1;
125 else {
126 buf->pos = 0;
127 buf->need = buf->size;
128 }
129 }
130 }
131 assert (i == len);
132 return i;
133 }
134
135 #endif /* __jack_midi_unpack_h__ */
jack_midi_event_write
LIB_EXPORT int jack_midi_event_write(void *port_buffer, jack_nframes_t time, const jack_midi_data_t *data, size_t data_size)
Definition: JackMidiAPI.cpp:134
midi_unpack_t
Definition: midi_unpack.h:26