Jack2  1.9.10
JackALSARawMidiSendQueue.cpp
00001 /*
00002 Copyright (C) 2011 Devin Anderson
00003 
00004 This program is free software; you can redistribute it and/or modify
00005 it under the terms of the GNU General Public License as published by
00006 the Free Software Foundation; either version 2 of the License, or
00007 (at your option) any later version.
00008 
00009 This program is distributed in the hope that it will be useful,
00010 but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 GNU General Public License for more details.
00013 
00014 You should have received a copy of the GNU General Public License
00015 along with this program; if not, write to the Free Software
00016 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 
00018 */
00019 
00020 #include <cassert>
00021 
00022 #include "JackALSARawMidiSendQueue.h"
00023 #include "JackMidiUtil.h"
00024 #include "JackError.h"
00025 
00026 using Jack::JackALSARawMidiSendQueue;
00027 
00028 JackALSARawMidiSendQueue::JackALSARawMidiSendQueue(snd_rawmidi_t *rawmidi,
00029                                                    size_t bytes_per_poll)
00030 {
00031     assert(bytes_per_poll > 0);
00032     this->bytes_per_poll = bytes_per_poll;
00033     this->rawmidi = rawmidi;
00034     blocked = false;
00035     bytes_available = bytes_per_poll;
00036 }
00037 
00038 Jack::JackMidiWriteQueue::EnqueueResult
00039 JackALSARawMidiSendQueue::EnqueueEvent(jack_nframes_t time, size_t size,
00040                                        jack_midi_data_t *buffer)
00041 {
00042     assert(size == 1);
00043     if (time > GetCurrentFrame()) {
00044         return EVENT_EARLY;
00045     }
00046     if (! bytes_available) {
00047         return BUFFER_FULL;
00048     }
00049     ssize_t result = snd_rawmidi_write(rawmidi, buffer, 1);
00050     switch (result) {
00051     case 1:
00052         blocked = false;
00053         bytes_available--;
00054         return OK;
00055     case -EWOULDBLOCK:
00056         blocked = true;
00057         return BUFFER_FULL;
00058     }
00059     jack_error("JackALSARawMidiSendQueue::EnqueueEvent - snd_rawmidi_write: "
00060                "%s", snd_strerror(result));
00061     return EN_ERROR;
00062 }
00063 
00064 bool
00065 JackALSARawMidiSendQueue::IsBlocked()
00066 {
00067     return blocked;
00068 }
00069 
00070 void
00071 JackALSARawMidiSendQueue::ResetPollByteCount()
00072 {
00073     bytes_available = bytes_per_poll;
00074 }