libs/ardour/midi_ui.cc

   1 /*
   2   Copyright (C) 2009 Paul Davis
   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 #include <cstdlib>
  20
  21 #include <sigc++/signal.h>
  22
  23 #include "pbd/pthread_utils.h"
  24
  25 #include "midi++/manager.h"
  26 #include "midi++/port.h"
  27
  28 #include "ardour/debug.h"
  29 #include "ardour/audioengine.h"
  30 #include "ardour/midi_ui.h"
  31 #include "ardour/session.h"
  32 #include "ardour/session_event.h"
  33 #include "ardour/types.h"
  34
  35 using namespace std;
  36 using namespace ARDOUR;
  37 using namespace PBD;
  38 using namespace Glib;
  39
  40 #include "i18n.h"
  41
  42 BaseUI::RequestType MidiControlUI::PortChange = BaseUI::new_request_type();
  43 MidiControlUI* MidiControlUI::_instance = 0;
  44
  45 #include "pbd/abstract_ui.cc"  /* instantiate the template */
  46
  47 MidiControlUI::MidiControlUI (Session& s)
  48         : AbstractUI<MidiUIRequest> (_("midiui"))
  49         , _session (s)
  50 {
  51         MIDI::Manager::instance()->PortsChanged.connect_same_thread (rebind_connection, boost::bind (&MidiControlUI::change_midi_ports, this));
  52         _instance = this;
  53 }
  54
  55 MidiControlUI::~MidiControlUI ()
  56 {
  57         clear_ports ();
  58         _instance = 0;
  59 }
  60
  61 void
  62 MidiControlUI::do_request (MidiUIRequest* req)
  63 {
  64         if (req->type == PortChange) {
  65
  66                 /* restart event loop with new ports */
  67                 DEBUG_TRACE (DEBUG::MidiIO, "reset ports\n");
  68                 reset_ports ();
  69
  70         } else if (req->type == CallSlot) {
  71
  72 #ifndef NDEBUG
  73                 if (getenv ("DEBUG_THREADED_SIGNALS")) {
  74                         cerr << "MIDI UI calls a slot\n";
  75                 }
  76 #endif
  77
  78                 req->the_slot ();
  79
  80         } else if (req->type == Quit) {
  81
  82                 BaseUI::quit ();
  83         }
  84 }
  85
  86 void
  87 MidiControlUI::change_midi_ports ()
  88 {
  89         MidiUIRequest* req = get_request (PortChange);
  90         if (req == 0) {
  91                 return;
  92         }
  93         send_request (req);
  94 }
  95
  96 bool
  97 MidiControlUI::midi_input_handler (IOCondition ioc, MIDI::Port* port)
  98 {
  99         DEBUG_TRACE (DEBUG::MidiIO, string_compose ("something happend on  %1\n", port->name()));
 100
 101         if (ioc & ~IO_IN) {
 102                 return false;
 103         }
 104
 105         if (ioc & IO_IN) {
 106
 107                 CrossThreadChannel::drain (port->selectable());
 108
 109                 DEBUG_TRACE (DEBUG::MidiIO, string_compose ("data available on %1\n", port->name()));
 110                 nframes64_t now = _session.engine().frame_time();
 111                 port->parse (now);
 112         }
 113
 114         return true;
 115 }
 116
 117 void
 118 MidiControlUI::clear_ports ()
 119 {
 120         for (PortSources::iterator i = port_sources.begin(); i != port_sources.end(); ++i) {
 121                 g_source_destroy (*i);
 122                 g_source_unref (*i);
 123         }
 124
 125         port_sources.clear ();
 126 }
 127
 128 void
 129 MidiControlUI::reset_ports ()
 130 {
 131         clear_ports ();
 132
 133         MIDI::Manager::PortList plist = MIDI::Manager::instance()->get_midi_ports ();
 134
 135         for (MIDI::Manager::PortList::iterator i = plist.begin(); i != plist.end(); ++i) {
 136                 int fd;
 137
 138                 if ((fd = (*i)->selectable ()) >= 0) {
 139                         Glib::RefPtr<IOSource> psrc = IOSource::create (fd, IO_IN|IO_HUP|IO_ERR);
 140
 141                         psrc->connect (sigc::bind (sigc::mem_fun (this, &MidiControlUI::midi_input_handler), *i));
 142                         psrc->attach (_main_loop->get_context());
 143
 144                         // glibmm hack: for now, store only the GSource*
 145
 146                         port_sources.push_back (psrc->gobj());
 147                         g_source_ref (psrc->gobj());
 148                 }
 149         }
 150 }
 151
 152 void
 153 MidiControlUI::thread_init ()
 154 {
 155         struct sched_param rtparam;
 156
 157         char* c = new char[7];
 158         strcpy (c, X_("midiUI"));
 159         pthread_set_name (c);
 160
 161         cerr << "MIDI UI running\n";
 162
 163         PBD::notify_gui_about_thread_creation (X_("gui"), pthread_self(), X_("MIDI"), 2048);
 164         SessionEvent::create_per_thread_pool (X_("MIDI I/O"), 128);
 165
 166         memset (&rtparam, 0, sizeof (rtparam));
 167         rtparam.sched_priority = 9; /* XXX should be relative to audio (JACK) thread */
 168
 169         if (pthread_setschedparam (pthread_self(), SCHED_FIFO, &rtparam) != 0) {
 170                 // do we care? not particularly.
 171         }
 172
 173         reset_ports ();
 174 }
 175