Jack2  1.9.8
JackFFADOMidiSendQueue.cpp
00001 /*
00002 Copyright (C) 2010 Devin Anderson
00003 
00004 This program is free software; you can redistribute it and/or modify
00005 it under the terms of the GNU Lesser General Public License as published by
00006 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
00013 
00014 You should have received a copy of the GNU Lesser General Public License
00015 along with this program; if not, write to the Free Software
00016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 
00018 */
00019 
00020 #include <cassert>
00021 
00022 #include "JackFFADOMidiSendQueue.h"
00023 #include "JackMidiUtil.h"
00024 
00025 using Jack::JackFFADOMidiSendQueue;
00026 
00027 JackFFADOMidiSendQueue::JackFFADOMidiSendQueue()
00028 {
00029     // Empty
00030 }
00031 
00032 Jack::JackMidiWriteQueue::EnqueueResult
00033 JackFFADOMidiSendQueue::EnqueueEvent(jack_nframes_t time, size_t size,
00034                                      jack_midi_data_t *buffer)
00035 {
00036     assert(size == 1);
00037     jack_nframes_t relative_time = (time < last_frame) ? 0 : time - last_frame;
00038     if (index < relative_time) {
00039         index = (relative_time % 8) ?
00040             (relative_time & (~ ((jack_nframes_t) 7))) + 8 : relative_time;
00041     }
00042     if (index >= length) {
00043         return BUFFER_FULL;
00044     }
00045     output_buffer[index] = 0x01000000 | ((uint32_t) *buffer);
00046     index += 8;
00047     return OK;
00048 }
00049 
00050 jack_nframes_t
00051 JackFFADOMidiSendQueue::GetNextScheduleFrame()
00052 {
00053     return last_frame + index;
00054 }
00055 
00056 void
00057 JackFFADOMidiSendQueue::ResetOutputBuffer(uint32_t *output_buffer,
00058                                           jack_nframes_t length)
00059 {
00060     index = 0;
00061     last_frame = GetLastFrame();
00062     this->length = length;
00063     this->output_buffer = output_buffer;
00064 }