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 "ardour/ardour.h"
40 #include "ardour/data_type.h"
41 #include "ardour/session_handle.h"
42 #include "ardour/libardour_visibility.h"
43 #include "ardour/types.h"
44 #include "ardour/chan_count.h"
45 #include "ardour/port_manager.h"
58 struct AudioBackendInfo;
60 class LIBARDOUR_API AudioEngine : public SessionHandlePtr, public PortManager
64 static AudioEngine* create ();
66 virtual ~AudioEngine ();
68 int discover_backends();
69 std::vector<const AudioBackendInfo*> available_backends() const;
70 std::string current_backend_name () const;
71 boost::shared_ptr<AudioBackend> set_default_backend ();
72 boost::shared_ptr<AudioBackend> set_backend (const std::string&, const std::string& arg1, const std::string& arg2);
73 boost::shared_ptr<AudioBackend> current_backend() const { return _backend; }
74 bool setup_required () const;
76 ProcessThread* main_thread() const { return _main_thread; }
78 /* START BACKEND PROXY API
80 * See audio_backend.h for full documentation and semantics. These wrappers
81 * just forward to a backend implementation.
84 int start (bool for_latency_measurement=false);
85 int stop (bool for_latency_measurement=false);
86 int freewheel (bool start_stop);
87 float get_dsp_load() const ;
88 void transport_start ();
89 void transport_stop ();
90 TransportState transport_state ();
91 void transport_locate (framepos_t pos);
92 framepos_t transport_frame();
93 framecnt_t sample_rate () const;
94 pframes_t samples_per_cycle () const;
95 int usecs_per_cycle () const;
96 size_t raw_buffer_size (DataType t);
97 framepos_t sample_time ();
98 framepos_t sample_time_at_cycle_start ();
99 pframes_t samples_since_cycle_start ();
100 bool get_sync_offset (pframes_t& offset) const;
102 int create_process_thread (boost::function<void()> func);
103 int join_process_threads ();
104 bool in_process_thread ();
105 uint32_t process_thread_count ();
107 int backend_reset_requested();
108 void request_backend_reset();
109 void request_device_list_update();
110 void launch_device_control_app();
112 bool is_realtime() const;
113 bool connected() const;
115 // for the user which hold state_lock to check if reset operation is pending
116 bool is_reset_requested() const { return g_atomic_int_get(const_cast<gint*>(&_hw_reset_request_count)); }
118 int set_device_name (const std::string&);
119 int set_sample_rate (float);
120 int set_buffer_size (uint32_t);
121 int set_interleaved (bool yn);
122 int set_input_channels (uint32_t);
123 int set_output_channels (uint32_t);
124 int set_systemic_input_latency (uint32_t);
125 int set_systemic_output_latency (uint32_t);
127 /* END BACKEND PROXY API */
129 bool freewheeling() const { return _freewheeling; }
130 bool running() const { return _running; }
132 Glib::Threads::Mutex& process_lock() { return _process_lock; }
133 Glib::Threads::RecMutex& state_lock() { return _state_lock; }
135 int request_buffer_size (pframes_t samples) {
136 return set_buffer_size (samples);
139 framecnt_t processed_frames() const { return _processed_frames; }
141 void set_session (Session *);
142 void remove_session (); // not a replacement for SessionHandle::session_going_away()
143 Session* session() const { return _session; }
145 void reconnect_session_routes (bool reconnect_inputs = true, bool reconnect_outputs = true);
147 class NoBackendAvailable : public std::exception {
149 virtual const char *what() const throw() { return "could not connect to engine backend"; }
152 void split_cycle (pframes_t offset);
154 int reset_timebase ();
156 void update_latencies ();
158 /* this signal is sent for every process() cycle while freewheeling.
159 (the regular process() call to session->process() is not made)
162 PBD::Signal1<int, pframes_t> Freewheel;
164 PBD::Signal0<void> Xrun;
166 /** this signal is emitted if the sample rate changes */
167 PBD::Signal1<void, framecnt_t> SampleRateChanged;
169 /** this signal is emitted if the buffer size changes */
170 PBD::Signal1<void, pframes_t> BufferSizeChanged;
172 /** this signal is emitted if the device cannot operate properly */
173 PBD::Signal0<void> DeviceError;
175 /* this signal is emitted if the device list changed */
177 PBD::Signal0<void> DeviceListChanged;
179 /* this signal is sent if the backend ever disconnects us */
181 PBD::Signal1<void,const char*> Halted;
183 /* these two are emitted when the engine itself is
187 PBD::Signal0<void> Running;
188 PBD::Signal0<void> Stopped;
190 /* these two are emitted when a device reset is initiated/finished
193 PBD::Signal0<void> DeviceResetStarted;
194 PBD::Signal0<void> DeviceResetFinished;
196 static AudioEngine* instance() { return _instance; }
197 static void destroy();
200 /* The backend will cause these at the appropriate time(s)
202 int process_callback (pframes_t nframes);
203 int buffer_size_change (pframes_t nframes);
204 int sample_rate_change (pframes_t nframes);
205 void freewheel_callback (bool);
206 void timebase_callback (TransportState state, pframes_t nframes, framepos_t pos, int new_position);
207 int sync_callback (TransportState state, framepos_t position);
208 int port_registration_callback ();
209 void latency_callback (bool for_playback);
210 void halted_callback (const char* reason);
212 /* sets up the process callback thread */
213 static void thread_init_callback (void *);
215 /* latency measurement */
217 MTDM* mtdm() { return _mtdm; }
218 MIDIDM* mididm() { return _mididm; }
220 int prepare_for_latency_measurement ();
221 int start_latency_detection (bool);
222 void stop_latency_detection ();
223 void set_latency_input_port (const std::string&);
224 void set_latency_output_port (const std::string&);
225 uint32_t latency_signal_delay () const { return _latency_signal_latency; }
227 enum LatencyMeasurement {
233 LatencyMeasurement measuring_latency () const { return _measuring_latency; }
238 static AudioEngine* _instance;
240 Glib::Threads::Mutex _process_lock;
241 Glib::Threads::RecMutex _state_lock;
242 Glib::Threads::Cond session_removed;
243 bool session_remove_pending;
244 frameoffset_t session_removal_countdown;
245 gain_t session_removal_gain;
246 gain_t session_removal_gain_step;
249 /// number of frames between each check for changes in monitor input
250 framecnt_t monitor_check_interval;
251 /// time of the last monitor check in frames
252 framecnt_t last_monitor_check;
253 /// the number of frames processed since start() was called
254 framecnt_t _processed_frames;
255 Glib::Threads::Thread* m_meter_thread;
256 ProcessThread* _main_thread;
259 LatencyMeasurement _measuring_latency;
260 PortEngine::PortHandle _latency_input_port;
261 PortEngine::PortHandle _latency_output_port;
262 framecnt_t _latency_flush_frames;
263 std::string _latency_input_name;
264 std::string _latency_output_name;
265 framecnt_t _latency_signal_latency;
266 bool _stopped_for_latency;
267 bool _started_for_latency;
270 Glib::Threads::Thread* _hw_reset_event_thread;
271 gint _hw_reset_request_count;
272 Glib::Threads::Cond _hw_reset_condition;
273 Glib::Threads::Mutex _reset_request_lock;
274 gint _stop_hw_reset_processing;
275 Glib::Threads::Thread* _hw_devicelist_update_thread;
276 gint _hw_devicelist_update_count;
277 Glib::Threads::Cond _hw_devicelist_update_condition;
278 Glib::Threads::Mutex _devicelist_update_lock;
279 gint _stop_hw_devicelist_processing;
281 void start_hw_event_processing();
282 void stop_hw_event_processing();
283 void do_reset_backend();
284 void do_devicelist_update();
286 void meter_thread ();
287 void start_metering_thread ();
288 void stop_metering_thread ();
290 static gint m_meter_exit;
292 typedef std::map<std::string,AudioBackendInfo*> BackendMap;
293 BackendMap _backends;
294 AudioBackendInfo* backend_discover (const std::string&);
295 void drop_backend ();
298 } // namespace ARDOUR
300 #endif /* __ardour_audioengine_h__ */