2 Copyright (C) 2004 Ian Esten
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.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include <jack/jack.h>
20 #include <jack/midiport.h>
25 jack_client_t
*client
;
26 jack_port_t
*output_port
;
28 unsigned char* note_frqs
;
29 jack_nframes_t
* note_starts
;
30 jack_nframes_t
* note_lengths
;
31 jack_nframes_t num_notes
;
32 jack_nframes_t loop_nsamp
;
33 jack_nframes_t loop_index
;
37 fprintf(stderr
, "usage: jack_midiseq name nsamp [startindex note nsamp] ...... [startindex note nsamp]\n");
38 fprintf(stderr
, "eg: jack_midiseq Sequencer 24000 0 60 8000 12000 63 8000\n");
39 fprintf(stderr
, "will play a 1/2 sec loop (if srate is 48khz) with a c4 note at the start of the loop\n");
40 fprintf(stderr
, "that lasts for 12000 samples, then a d4# that starts at 1/4 sec that lasts for 800 samples\n");
43 int process(jack_nframes_t nframes
, void *arg
)
46 void* port_buf
= jack_port_get_buffer(output_port
, nframes
);
47 unsigned char* buffer
;
48 jack_midi_clear_buffer(port_buf
);
49 /*memset(buffer, 0, nframes*sizeof(jack_default_audio_sample_t));*/
51 for(i
=0; i
<nframes
; i
++)
53 for(j
=0; j
<num_notes
; j
++)
55 if(note_starts
[j
] == loop_index
)
57 buffer
= jack_midi_event_reserve(port_buf
, i
, 3);
58 /* printf("wrote a note on, port buffer = 0x%x, event buffer = 0x%x\n", port_buf, buffer);*/
59 buffer
[2] = 64; /* velocity */
60 buffer
[1] = note_frqs
[j
];
61 buffer
[0] = 0x90; /* note on */
63 else if(note_starts
[j
] + note_lengths
[j
] == loop_index
)
65 buffer
= jack_midi_event_reserve(port_buf
, i
, 3);
66 /* printf("wrote a note off, port buffer = 0x%x, event buffer = 0x%x\n", port_buf, buffer);*/
67 buffer
[2] = 64; /* velocity */
68 buffer
[1] = note_frqs
[j
];
69 buffer
[0] = 0x80; /* note off */
72 loop_index
= loop_index
+1 >= loop_nsamp
? 0 : loop_index
+1;
77 int main(int narg
, char **args
)
80 jack_nframes_t nframes
;
81 if((narg
<6) || ((narg
-3)%3 !=0))
86 if((client
= jack_client_new (args
[1])) == 0)
88 fprintf (stderr
, "jack server not running?\n");
91 jack_set_process_callback (client
, process
, 0);
92 output_port
= jack_port_register (client
, "out", JACK_DEFAULT_MIDI_TYPE
, JackPortIsOutput
, 0);
93 nframes
= jack_get_buffer_size(client
);
95 num_notes
= (narg
- 3)/3;
96 note_frqs
= malloc(num_notes
*sizeof(unsigned char));
97 note_starts
= malloc(num_notes
*sizeof(unsigned char));
98 note_lengths
= malloc(num_notes
*sizeof(jack_nframes_t
));
99 loop_nsamp
= atoi(args
[2]);
100 for(i
=0; i
<num_notes
; i
++)
102 note_starts
[i
] = atoi(args
[3 + 3*i
]);
103 note_frqs
[i
] = atoi(args
[4 + 3*i
]);
104 note_lengths
[i
] = atoi(args
[5 + 3*i
]);
107 if (jack_activate(client
))
109 fprintf (stderr
, "cannot activate client");