Jack2  1.9.8
JackFFADOMidiOutputPort.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 <memory>
00021 
00022 #include "JackFFADOMidiOutputPort.h"
00023 #include "JackMidiUtil.h"
00024 
00025 using Jack::JackFFADOMidiOutputPort;
00026 
00027 JackFFADOMidiOutputPort::JackFFADOMidiOutputPort(size_t non_rt_size,
00028                                                  size_t max_non_rt_messages,
00029                                                  size_t max_rt_messages)
00030 {
00031     event = 0;
00032     read_queue = new JackMidiBufferReadQueue();
00033     std::auto_ptr<JackMidiBufferReadQueue> read_queue_ptr(read_queue);
00034     send_queue = new JackFFADOMidiSendQueue();
00035     std::auto_ptr<JackFFADOMidiSendQueue> send_queue_ptr(send_queue);
00036     raw_queue = new JackMidiRawOutputWriteQueue(send_queue, non_rt_size,
00037                                                 max_non_rt_messages,
00038                                                 max_rt_messages);
00039     send_queue_ptr.release();
00040     read_queue_ptr.release();
00041 }
00042 
00043 JackFFADOMidiOutputPort::~JackFFADOMidiOutputPort()
00044 {
00045     delete raw_queue;
00046     delete read_queue;
00047     delete send_queue;
00048 }
00049 
00050 void
00051 JackFFADOMidiOutputPort::Process(JackMidiBuffer *port_buffer,
00052                                  uint32_t *output_buffer,
00053                                  jack_nframes_t frames)
00054 {
00055     read_queue->ResetMidiBuffer(port_buffer);
00056     send_queue->ResetOutputBuffer(output_buffer, frames);
00057     jack_nframes_t boundary_frame = GetLastFrame() + frames;
00058     if (! event) {
00059         event = read_queue->DequeueEvent();
00060     }
00061     for (; event; event = read_queue->DequeueEvent()) {
00062         switch (raw_queue->EnqueueEvent(event)) {
00063         case JackMidiWriteQueue::BUFFER_FULL:
00064 
00065             // Processing events early might free up some space in the raw
00066             // output queue.
00067 
00068             raw_queue->Process(boundary_frame);
00069             switch (raw_queue->EnqueueEvent(event)) {
00070             case JackMidiWriteQueue::BUFFER_TOO_SMALL:
00071                 // This shouldn't really happen.  It indicates a bug if it
00072                 // does.
00073                 jack_error("JackFFADOMidiOutputPort::Process - **BUG** "
00074                            "JackMidiRawOutputWriteQueue::EnqueueEvent "
00075                            "returned `BUFFER_FULL`, and then returned "
00076                            "`BUFFER_TOO_SMALL` after a `Process()` call.");
00077                 // Fallthrough on purpose
00078             case JackMidiWriteQueue::OK:
00079                 continue;
00080             default:
00081                 return;
00082             }
00083         case JackMidiWriteQueue::BUFFER_TOO_SMALL:
00084             jack_error("JackFFADOMidiOutputPort::Process - The write queue "
00085                        "couldn't enqueue a %d-byte event. Dropping event.",
00086                        event->size);
00087             // Fallthrough on purpose
00088         case JackMidiWriteQueue::OK:
00089             continue;
00090         default:
00091             // This is here to stop compliers from warning us about not
00092             // handling enumeration values.
00093             ;
00094         }
00095         break;
00096     }
00097     raw_queue->Process(boundary_frame);
00098 }