Jack2
1.9.8
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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 00025 using Jack::JackALSARawMidiSendQueue; 00026 00027 JackALSARawMidiSendQueue::JackALSARawMidiSendQueue(snd_rawmidi_t *rawmidi, 00028 size_t bytes_per_poll) 00029 { 00030 assert(bytes_per_poll > 0); 00031 this->bytes_per_poll = bytes_per_poll; 00032 this->rawmidi = rawmidi; 00033 blocked = false; 00034 bytes_available = bytes_per_poll; 00035 } 00036 00037 Jack::JackMidiWriteQueue::EnqueueResult 00038 JackALSARawMidiSendQueue::EnqueueEvent(jack_nframes_t time, size_t size, 00039 jack_midi_data_t *buffer) 00040 { 00041 assert(size == 1); 00042 if (time > GetCurrentFrame()) { 00043 return EVENT_EARLY; 00044 } 00045 if (! bytes_available) { 00046 return BUFFER_FULL; 00047 } 00048 ssize_t result = snd_rawmidi_write(rawmidi, buffer, 1); 00049 switch (result) { 00050 case 1: 00051 blocked = false; 00052 bytes_available--; 00053 return OK; 00054 case -EWOULDBLOCK: 00055 blocked = true; 00056 return BUFFER_FULL; 00057 } 00058 jack_error("JackALSARawMidiSendQueue::EnqueueEvent - snd_rawmidi_write: " 00059 "%s", snd_strerror(result)); 00060 return EN_ERROR; 00061 } 00062 00063 bool 00064 JackALSARawMidiSendQueue::IsBlocked() 00065 { 00066 return blocked; 00067 } 00068 00069 void 00070 JackALSARawMidiSendQueue::ResetPollByteCount() 00071 { 00072 bytes_available = bytes_per_poll; 00073 }