Jack2: JackMidiUtil.cpp Source File

Jack2 1.9.12

JackMidiUtil.cpp
1 /*
2 Copyright (C) 2010 Devin Anderson
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published by
6 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser 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
20 #include "JackEngineControl.h"
21 #include "JackFrameTimer.h"
22 #include "JackGlobals.h"
23 #include "JackMidiUtil.h"
24 #include "JackTime.h"
25
26 jack_midi_data_t
27 Jack::ApplyRunningStatus(size_t *size, jack_midi_data_t **buffer,
28 jack_midi_data_t running_status)
29 {
30
31 // Stolen and modified from alsa/midi_pack.h
32
33 jack_midi_data_t status = **buffer;
34 if ((status >= 0x80) && (status < 0xf0)) {
35 if (status == running_status) {
36 (*buffer)++;
37 (*size)--;
38 } else {
39 running_status = status;
40 }
41 } else if (status < 0xf8) {
42 running_status = 0;
43 }
44 return running_status;
45 }
46
47 jack_midi_data_t
48 Jack::ApplyRunningStatus(jack_midi_event_t *event,
49 jack_midi_data_t running_status)
50 {
51 return ApplyRunningStatus(&(event->size), &(event->buffer),
52 running_status);
53 }
54
55 jack_nframes_t
56 Jack::GetCurrentFrame()
57 {
58 jack_time_t time = GetMicroSeconds();
59 JackEngineControl *control = GetEngineControl();
60 JackTimer timer;
61 control->ReadFrameTime(&timer);
62 return timer.Time2Frames(time, control->fBufferSize);
63 }
64
65 jack_nframes_t
66 Jack::GetFramesFromTime(jack_time_t time)
67 {
68 JackEngineControl* control = GetEngineControl();
69 JackTimer timer;
70 control->ReadFrameTime(&timer);
71 return timer.Time2Frames(time, control->fBufferSize);
72 }
73
74 jack_nframes_t
75 Jack::GetLastFrame()
76 {
77 return GetEngineControl()->fFrameTimer.ReadCurrentState()->CurFrame();
78 }
79
80 int
81 Jack::GetMessageLength(jack_midi_data_t status_byte)
82 {
83 switch (status_byte & 0xf0) {
84 case 0x80:
85 case 0x90:
86 case 0xa0:
87 case 0xb0:
88 case 0xe0:
89 return 3;
90 case 0xc0:
91 case 0xd0:
92 return 2;
93 case 0xf0:
94 switch (status_byte) {
95 case 0xf0:
96 return 0;
97 case 0xf1:
98 case 0xf3:
99 return 2;
100 case 0xf2:
101 return 3;
102 case 0xf4:
103 case 0xf5:
104 case 0xf7:
105 case 0xfd:
106 break;
107 default:
108 return 1;
109 }
110 }
111 return -1;
112 }
113
114 jack_time_t
115 Jack::GetTimeFromFrames(jack_nframes_t frames)
116 {
117 JackEngineControl* control = GetEngineControl();
118 JackTimer timer;
119 control->ReadFrameTime(&timer);
120 return timer.Frames2Time(frames, control->fBufferSize);
121 }
Jack::JackAtomicState::ReadCurrentState
T * ReadCurrentState()
Returns the current state : only valid in the RT reader thread.
Definition: JackAtomicState.h:144
jack_midi_event_t::buffer
jack_midi_data_t * buffer
Definition: JackMidiPort.h:37
jack_midi_event_t::size
size_t size
Definition: JackMidiPort.h:36
jack_midi_event_t
Definition: JackMidiPort.h:33