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"
50 #include "ardour/port_manager.h"
52 #ifdef HAVE_JACK_SESSION
53 #include <jack/session.h>
65 class AudioEngine : public SessionHandlePtr, public PortManager
69 static AudioEngine* create (const std::string& client_name, const std::string& session_uuid);
71 virtual ~AudioEngine ();
73 int discover_backends();
74 std::vector<std::string> available_backends() const;
75 std::string current_backend_name () const;
76 int set_backend (const std::string&);
78 ProcessThread* main_thread() const { return _main_thread; }
80 std::string client_name() const { return backend_client_name; }
82 /* START BACKEND PROXY API
84 * See audio_backend.h for full documentation and semantics. These wrappers
85 * just forward to a backend implementation.
91 int freewheel (bool start_stop);
92 float get_cpu_load() const ;
93 void transport_start ();
94 void transport_stop ();
95 TransportState transport_state ();
96 void transport_locate (framepos_t pos);
97 framepos_t transport_frame();
98 framecnt_t sample_rate () const;
99 pframes_t samples_per_cycle () const;
100 int usecs_per_cycle () const;
101 size_t raw_buffer_size (DataType t);
102 pframes_t sample_time ();
103 pframes_t sample_time_at_cycle_start ();
104 pframes_t samples_since_cycle_start ();
105 bool get_sync_offset (pframes_t& offset) const;
106 int create_process_thread (boost::function<void()> func, pthread_t*, size_t stacksize);
107 bool is_realtime() const;
109 /* END BACKEND PROXY API */
111 bool freewheeling() const { return _freewheeling; }
112 bool running() const { return _running; }
114 Glib::Threads::Mutex& process_lock() { return _process_lock; }
116 int request_buffer_size (pframes_t);
118 framecnt_t processed_frames() const { return _processed_frames; }
120 void set_session (Session *);
121 void remove_session (); // not a replacement for SessionHandle::session_going_away()
123 class NoBackendAvailable : public std::exception {
125 virtual const char *what() const throw() { return "could not connect to engine backend"; }
128 void split_cycle (pframes_t offset);
130 int reset_timebase ();
132 void update_latencies ();
135 /* this signal is sent for every process() cycle while freewheeling.
136 (the regular process() call to session->process() is not made)
139 PBD::Signal1<int, pframes_t> Freewheel;
141 PBD::Signal0<void> Xrun;
143 /* this signal is if the backend notifies us of a graph order event */
145 PBD::Signal0<void> GraphReordered;
147 #ifdef HAVE_JACK_SESSION
148 PBD::Signal1<void,jack_session_event_t *> JackSessionEvent;
151 /* this signal is emitted if the sample rate changes */
153 PBD::Signal1<void, framecnt_t> SampleRateChanged;
155 /* this signal is sent if the backend ever disconnects us */
157 PBD::Signal1<void,const char*> Halted;
159 /* these two are emitted when the engine itself is
163 PBD::Signal0<void> Running;
164 PBD::Signal0<void> Stopped;
166 /** Emitted if a Port is registered or unregistered */
167 PBD::Signal0<void> PortRegisteredOrUnregistered;
169 /** Emitted if a Port is connected or disconnected.
170 * The Port parameters are the ports being connected / disconnected, or 0 if they are not known to Ardour.
171 * The std::string parameters are the (long) port names.
172 * The bool parameter is true if ports were connected, or false for disconnected.
174 PBD::Signal5<void, boost::weak_ptr<Port>, std::string, boost::weak_ptr<Port>, std::string, bool> PortConnectedOrDisconnected;
176 std::string make_port_name_relative (std::string) const;
177 std::string make_port_name_non_relative (std::string) const;
178 bool port_is_mine (const std::string&) const;
180 static AudioEngine* instance() { return _instance; }
181 static void destroy();
184 /* The backend will cause these at the appropriate time(s)
186 int process_callback (pframes_t nframes);
187 int buffer_size_change (pframes_t nframes);
188 int sample_rate_change (pframes_t nframes);
189 void freewheel_callback (bool);
190 void timebase_callback (TransportState state, pframes_t nframes, framepos_t pos, int new_position);
191 int sync_callback (TransportState state, framepos_t position);
192 int port_registration_callback ();
193 void latency_callback (bool for_playback);
194 void halted_callback (const char* reason);
196 /* sets up the process callback thread */
197 static void thread_init_callback (void *);
200 AudioEngine (const std::string& client_name, const std::string& session_uuid);
202 static AudioEngine* _instance;
204 AudioBackend* _backend;
205 Glib::Threads::Mutex _process_lock;
206 Glib::Threads::Cond session_removed;
207 bool session_remove_pending;
208 frameoffset_t session_removal_countdown;
209 gain_t session_removal_gain;
210 gain_t session_removal_gain_step;
213 mutable framecnt_t _buffer_size;
214 std::map<DataType,size_t> _raw_buffer_sizes;
215 mutable framecnt_t _frame_rate;
216 /// number of frames between each check for changes in monitor input
217 framecnt_t monitor_check_interval;
218 /// time of the last monitor check in frames
219 framecnt_t last_monitor_check;
220 /// the number of frames processed since start() was called
221 framecnt_t _processed_frames;
223 bool _pre_freewheel_mmc_enabled;
224 int _usecs_per_cycle;
225 bool port_remove_in_progress;
226 Glib::Threads::Thread* m_meter_thread;
227 ProcessThread* _main_thread;
229 std::string backend_client_name;
230 std::string backend_session_uuid;
232 void meter_thread ();
233 void start_metering_thread ();
234 void stop_metering_thread ();
236 static gint m_meter_exit;
238 void parameter_changed (const std::string&);
239 PBD::ScopedConnection config_connection;
241 typedef std::map<std::string,AudioBackend*> BackendMap;
242 BackendMap _backends;
243 AudioBackend* backend_discover (const std::string&);
244 void drop_backend ();
247 } // namespace ARDOUR
249 #endif /* __ardour_audioengine_h__ */