src/midiplayer.cc


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

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            midiplayer.cc
 *
 *  Sat Jul 26 15:23:19 CEST 2008
 *  Copyright 2008 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo 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.
 *
 *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "midiplayer.h"

#define NOTE_ON 0x90

int _process(jack_nframes_t nframes, void *arg)
{
  return ((MidiPlayer*)arg)->process(nframes);
}

MidiPlayer::MidiPlayer(std::string filename)
{
	jack_status_t status;

  jack_client_t *jack_client = jack_client_open("MidiTest", JackNullOption, &status);

	port = jack_port_register(jack_client,
                            "midi_out",
                            JACK_DEFAULT_MIDI_TYPE,
                            JackPortIsOutput,// | JackPortIsTerminal,
                            0);

  jack_set_process_callback(jack_client, _process, this);

	jack_activate(jack_client);

  jack_connect(jack_client, "MidiTest:midi_out", "DrumGizmo:midi_in");

  jack_connect(jack_client, "DrumGizmo:Kick-R", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Kick-L", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:SnareTop", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:SnareBottom", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:SnareTrigger", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Tom1", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Tom2", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Tom3", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Tom4", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Ride", "system:playback_1");
  //  jack_connect(jack_client, "DrumGizmo:Hihat", "system:playback_1");

  jack_connect(jack_client, "DrumGizmo:Kick-R", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Kick-L", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:SnareTop", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:SnareBottom", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:SnareTrigger", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Tom1", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Tom2", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Tom3", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Tom4", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Ride", "system:playback_2");
  //  jack_connect(jack_client, "DrumGizmo:Hihat", "system:playback_2");

  jack_connect(jack_client, "DrumGizmo:OH-R", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:OH-L", "system:playback_2");
  jack_connect(jack_client, "DrumGizmo:Amb-R", "system:playback_1");
  jack_connect(jack_client, "DrumGizmo:Amb-L", "system:playback_2");

  timer = 0;
  next = 44100;
}

MidiPlayer::~MidiPlayer()
{
}

#if 0 // All
#define NUM_INST 11
static int inst[] = { 35, 36, 38, 46, 41, 43, 45, 47, 49, 57, 51 };
#endif

#if 1 // Cymbals
#define NUM_INST 3
static int inst[] = { 51, 49, 57 };
#endif

#if 0 // Toms
#define NUM_INST 4
static int inst[] = { 41, 43, 45, 47 };
#endif

#if 0 // Kicks
#define NUM_INST 2
static int inst[] = { 35, 36 };
#endif
int MidiPlayer::process(jack_nframes_t nframes)
{
  return 0;

  //  if(jack_port_connected_to(test_midi_port, "DrumGizmo:midi_in")) {
  void* port_buf = jack_port_get_buffer(port, nframes);

  if(timer > next) { // activate every second (44100 samples)
    //    printf("ding\n");

    jack_nframes_t time = (jack_nframes_t)(((float)rand() / (float)RAND_MAX) * nframes);
    size_t size = 3;
    jack_midi_data_t note[] = { NOTE_ON, inst[rand() % NUM_INST], rand() % 127};
    jack_midi_event_write(port_buf, time, note, size);

    timer = 0;
    next = (size_t)(((float)rand() / (float)RAND_MAX) * 0.2 * 44100);
  }

  timer += nframes;
  
  return 0;
}