Jack2  1.9.9
JackALSARawMidiSendQueue.cpp
1 /*
2 Copyright (C) 2011 Devin Anderson
3 
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.
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 General Public License for more details.
13 
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.
17 
18 */
19 
20 #include <cassert>
21 
22 #include "JackALSARawMidiSendQueue.h"
23 #include "JackMidiUtil.h"
24 #include "JackError.h"
25 
27 
28 JackALSARawMidiSendQueue::JackALSARawMidiSendQueue(snd_rawmidi_t *rawmidi,
29  size_t bytes_per_poll)
30 {
31  assert(bytes_per_poll > 0);
32  this->bytes_per_poll = bytes_per_poll;
33  this->rawmidi = rawmidi;
34  blocked = false;
35  bytes_available = bytes_per_poll;
36 }
37 
38 Jack::JackMidiWriteQueue::EnqueueResult
39 JackALSARawMidiSendQueue::EnqueueEvent(jack_nframes_t time, size_t size,
40  jack_midi_data_t *buffer)
41 {
42  assert(size == 1);
43  if (time > GetCurrentFrame()) {
44  return EVENT_EARLY;
45  }
46  if (! bytes_available) {
47  return BUFFER_FULL;
48  }
49  ssize_t result = snd_rawmidi_write(rawmidi, buffer, 1);
50  switch (result) {
51  case 1:
52  blocked = false;
53  bytes_available--;
54  return OK;
55  case -EWOULDBLOCK:
56  blocked = true;
57  return BUFFER_FULL;
58  }
59  jack_error("JackALSARawMidiSendQueue::EnqueueEvent - snd_rawmidi_write: "
60  "%s", snd_strerror(result));
61  return EN_ERROR;
62 }
63 
64 bool
65 JackALSARawMidiSendQueue::IsBlocked()
66 {
67  return blocked;
68 }
69 
70 void
71 JackALSARawMidiSendQueue::ResetPollByteCount()
72 {
73  bytes_available = bytes_per_poll;
74 }
JackMidiWriteQueue::EnqueueResult EnqueueEvent(jack_nframes_t time, size_t size, jack_midi_data_t *buffer)
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:91