midi_unpack.h
/*
* Copyright (c) 2006,2007 Dmitry S. Baikov
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __jack_midi_unpack_h__
#define __jack_midi_unpack_h__
enum {
MIDI_UNPACK_MAX_MSG = 1024
};
typedef struct
{
int pos, need, size;
unsigned char data[MIDI_UNPACK_MAX_MSG];
}
midi_unpack_t;
static inline
void midi_unpack_init(midi_unpack_t *u)
{
u->pos = 0;
u->size = sizeof(u->data);
u->need = u->size;
}
static inline
void midi_unpack_reset(midi_unpack_t *u)
{
u->pos = 0;
u->need = u->size;
}
static const unsigned char midi_voice_len[] =
{
3, /*0x80 Note Off*/
3, /*0x90 Note On*/
3, /*0xA0 Aftertouch*/
3, /*0xB0 Control Change*/
2, /*0xC0 Program Change*/
2, /*0xD0 Channel Pressure*/
3, /*0xE0 Pitch Wheel*/
1 /*0xF0 System*/
};
static const unsigned char midi_system_len[] =
{
0, /*0xF0 System Exclusive Start*/
2, /*0xF1 MTC Quarter Frame*/
3, /*0xF2 Song Postion*/
2, /*0xF3 Song Select*/
0, /*0xF4 undefined*/
0, /*0xF5 undefined*/
1, /*0xF6 Tune Request*/
1 /*0xF7 System Exlusive End*/
};
static
int midi_unpack_buf(midi_unpack_t *buf, const unsigned char *data, int len, void *jack_port_buf, jack_nframes_t time)
{
int i;
for (i = 0; i < len; ++i) {
const unsigned char byte = data[i];
if (byte >= 0xF8) // system realtime
{
jack_midi_event_write(jack_port_buf, time, &data[i], 1);
//printf("midi_unpack: written system relatime event\n");
//midi_input_write(in, &data[i], 1);
} else if (byte < 0x80) // data
{
assert (buf->pos < buf->size);
buf->data[buf->pos++] = byte;
} else if (byte < 0xF0) // voice
{
assert (byte >= 0x80 && byte < 0xF0);
//buf->need = ((byte|0x0F) == 0xCF || (byte|0x0F)==0xDF) ? 2 : 3;
buf->need = midi_voice_len[(byte-0x80)>>4];
buf->data[0] = byte;
buf->pos = 1;
} else if (byte == 0xF7) // sysex end
{
assert (buf->pos < buf->size);
buf->data[buf->pos++] = byte;
buf->need = buf->pos;
} else {
assert (byte >= 0xF0 && byte < 0xF8);
buf->pos = 1;
buf->data[0] = byte;
buf->need = midi_system_len[byte - 0xF0];
if (!buf->need)
buf->need = buf->size;
}
if (buf->pos == buf->need) {
// TODO: deal with big sysex'es (they are silently dropped for now)
if (buf->data[0] >= 0x80 || (buf->data[0] == 0xF0 && buf->data[buf->pos-1] == 0xF7)) {
/* convert Note On with velocity 0 to Note Off */
if ((buf->data[0] & 0xF0) == 0x90 && buf->data[2] == 0) {
// we use temp array here to keep running status sync
jack_midi_data_t temp[3] = { 0x80, 0, 0x40 };
temp[0] |= buf->data[0] & 0x0F;
temp[1] = buf->data[1];
jack_midi_event_write(jack_port_buf, time, temp, 3);
} else
jack_midi_event_write(jack_port_buf, time, &buf->data[0], buf->pos);
//printf("midi_unpack: written %d-byte event\n", buf->pos);
//midi_input_write(in, &buf->data[0], buf->pos);
}
/* keep running status */
if (buf->data[0] >= 0x80 && buf->data[0] < 0xF0)
buf->pos = 1;
else {
buf->pos = 0;
buf->need = buf->size;
}
}
}
assert (i == len);
return i;
}
#endif /* __jack_midi_unpack_h__ */
midi_unpack_t
Definition: midi_unpack.h:26
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