2 Copyright (C) 2002-2004 Paul Davis
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.
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.
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.
20 #ifndef __ardour_audioengine_h__
21 #define __ardour_audioengine_h__
24 #include "libardour-config.h"
34 #include <glibmm/threads.h>
36 #include "pbd/signals.h"
37 #include "pbd/stacktrace.h"
39 #include <jack/weakjack.h>
40 #include <jack/jack.h>
41 #include <jack/transport.h>
42 #include <jack/thread.h>
44 #include "ardour/ardour.h"
46 #include "ardour/data_type.h"
47 #include "ardour/session_handle.h"
48 #include "ardour/types.h"
49 #include "ardour/chan_count.h"
51 #ifdef HAVE_JACK_SESSION
52 #include <jack/session.h>
64 class AudioEngine : public SessionHandlePtr
67 typedef std::map<std::string,boost::shared_ptr<Port> > Ports;
69 AudioEngine (std::string client_name, std::string session_uuid);
70 virtual ~AudioEngine ();
72 static int discover_backends();
73 std::vector<std::string> available_backends() const;
74 std::string current_backend_name () const;
76 ProcessThread* main_thread() const { return _main_thread; }
78 std::string client_name() const { return backend_client_name; }
80 int stop (bool forever = false);
83 int freewheel (bool onoff);
84 bool freewheeling() const { return _freewheeling; }
86 bool running() const { return _running; }
87 Glib::Threads::Mutex& process_lock() { return _process_lock; }
89 int request_buffer_size (pframes_t);
91 framecnt_t processed_frames() const { return _processed_frames; }
95 void set_session (Session *);
96 void remove_session (); // not a replacement for SessionHandle::session_going_away()
98 class NoBackendAvailable : public std::exception {
100 virtual const char *what() const throw() { return "could not connect to engine backend"; }
103 void split_cycle (pframes_t offset);
105 int reset_timebase ();
107 void update_latencies ();
110 /* this signal is sent for every process() cycle while freewheeling.
111 (the regular process() call to session->process() is not made)
114 PBD::Signal1<int, pframes_t> Freewheel;
116 PBD::Signal0<void> Xrun;
118 /* this signal is if the backend notifies us of a graph order event */
120 PBD::Signal0<void> GraphReordered;
122 #ifdef HAVE_JACK_SESSION
123 PBD::Signal1<void,jack_session_event_t *> JackSessionEvent;
126 /* this signal is emitted if the sample rate changes */
128 PBD::Signal1<void, framecnt_t> SampleRateChanged;
130 /* this signal is sent if the backend ever disconnects us */
132 PBD::Signal1<void,const char*> Halted;
134 /* these two are emitted when the engine itself is
138 PBD::Signal0<void> Running;
139 PBD::Signal0<void> Stopped;
141 /** Emitted if a Port is registered or unregistered */
142 PBD::Signal0<void> PortRegisteredOrUnregistered;
144 /** Emitted if a Port is connected or disconnected.
145 * The Port parameters are the ports being connected / disconnected, or 0 if they are not known to Ardour.
146 * The std::string parameters are the (long) port names.
147 * The bool parameter is true if ports were connected, or false for disconnected.
149 PBD::Signal5<void, boost::weak_ptr<Port>, std::string, boost::weak_ptr<Port>, std::string, bool> PortConnectedOrDisconnected;
151 std::string make_port_name_relative (std::string) const;
152 std::string make_port_name_non_relative (std::string) const;
153 bool port_is_mine (const std::string&) const;
155 static AudioEngine* instance() { return _instance; }
156 static void destroy();
159 /* The backend will cause this at the appropriate time(s)
161 int process_callback (pframes_t nframes);
164 static AudioEngine* _instance;
166 Glib::Threads::Mutex _process_lock;
167 Glib::Threads::Cond session_removed;
168 bool session_remove_pending;
169 frameoffset_t session_removal_countdown;
170 gain_t session_removal_gain;
171 gain_t session_removal_gain_step;
174 mutable framecnt_t _buffer_size;
175 std::map<DataType,size_t> _raw_buffer_sizes;
176 mutable framecnt_t _frame_rate;
177 /// number of frames between each check for changes in monitor input
178 framecnt_t monitor_check_interval;
179 /// time of the last monitor check in frames
180 framecnt_t last_monitor_check;
181 /// the number of frames processed since start() was called
182 framecnt_t _processed_frames;
184 bool _pre_freewheel_mmc_enabled;
185 int _usecs_per_cycle;
186 bool port_remove_in_progress;
187 Glib::Threads::Thread* m_meter_thread;
188 ProcessThread* _main_thread;
191 void meter_thread ();
192 void start_metering_thread ();
193 void stop_metering_thread ();
195 static gint m_meter_exit;
197 void parameter_changed (const std::string&);
198 PBD::ScopedConnection config_connection;
201 } // namespace ARDOUR
203 #endif /* __ardour_audioengine_h__ */