Jack2  1.9.9
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 }
T * ReadCurrentState()
Returns the current state : only valid in the RT reader thread.
jack_midi_data_t * buffer
Definition: JackMidiPort.h:37