2 * Copyright (C) 2014 Robin Gareus <robin@gareus.org>
3 * Copyright (C) 2013 Paul Davis
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __libbackend_alsa_audiobackend_h__
21 #define __libbackend_alsa_audiobackend_h__
31 #include <boost/shared_ptr.hpp>
33 #include "ardour/audio_backend.h"
34 #include "ardour/system_exec.h"
35 #include "ardour/types.h"
37 #include "zita-alsa-pcmi.h"
38 #include "alsa_rawmidi.h"
42 class AlsaAudioBackend;
46 AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
47 AlsaMidiEvent (const AlsaMidiEvent& other);
49 size_t size () const { return _size; };
50 pframes_t timestamp () const { return _timestamp; };
51 const unsigned char* const_data () const { return _data; };
52 unsigned char* data () { return _data; };
53 bool operator< (const AlsaMidiEvent &other) const { return timestamp () < other.timestamp (); };
60 typedef std::vector<boost::shared_ptr<AlsaMidiEvent> > AlsaMidiBuffer;
64 AlsaPort (AlsaAudioBackend &b, const std::string&, PortFlags);
68 const std::string& name () const { return _name; }
69 PortFlags flags () const { return _flags; }
71 int set_name (const std::string &name) { _name = name; return 0; }
73 virtual DataType type () const = 0;
75 bool is_input () const { return flags () & IsInput; }
76 bool is_output () const { return flags () & IsOutput; }
77 bool is_physical () const { return flags () & IsPhysical; }
78 bool is_terminal () const { return flags () & IsTerminal; }
79 bool is_connected () const { return _connections.size () != 0; }
80 bool is_connected (const AlsaPort *port) const;
81 bool is_physically_connected () const;
83 const std::vector<AlsaPort *>& get_connections () const { return _connections; }
85 int connect (AlsaPort *port);
86 int disconnect (AlsaPort *port);
87 void disconnect_all ();
89 virtual void* get_buffer (pframes_t nframes) = 0;
91 const LatencyRange& latency_range (bool for_playback) const
93 return for_playback ? _playback_latency_range : _capture_latency_range;
96 void set_latency_range (const LatencyRange &latency_range, bool for_playback)
100 _playback_latency_range = latency_range;
104 _capture_latency_range = latency_range;
109 AlsaAudioBackend &_alsa_backend;
111 const PortFlags _flags;
112 LatencyRange _capture_latency_range;
113 LatencyRange _playback_latency_range;
114 std::vector<AlsaPort*> _connections;
116 void _connect (AlsaPort* , bool);
117 void _disconnect (AlsaPort* , bool);
121 class AlsaAudioPort : public AlsaPort {
123 AlsaAudioPort (AlsaAudioBackend &b, const std::string&, PortFlags);
126 DataType type () const { return DataType::AUDIO; };
128 Sample* buffer () { return _buffer; }
129 const Sample* const_buffer () const { return _buffer; }
130 void* get_buffer (pframes_t nframes);
133 Sample _buffer[8192];
134 }; // class AlsaAudioPort
136 class AlsaMidiPort : public AlsaPort {
138 AlsaMidiPort (AlsaAudioBackend &b, const std::string&, PortFlags);
141 DataType type () const { return DataType::MIDI; };
143 void* get_buffer (pframes_t nframes);
144 const AlsaMidiBuffer const_buffer () const { return _buffer[_bufperiod]; }
146 void next_period() { get_buffer(0); _bufperiod = (_bufperiod + 1) % 2; }
149 AlsaMidiBuffer _buffer[2];
151 }; // class AlsaMidiPort
153 class AlsaAudioBackend : public AudioBackend {
154 friend class AlsaPort;
156 AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info);
157 ~AlsaAudioBackend ();
159 /* AUDIOBACKEND API */
161 std::string name () const;
162 bool is_realtime () const;
164 std::vector<DeviceStatus> enumerate_devices () const;
165 std::vector<float> available_sample_rates (const std::string& device) const;
166 std::vector<uint32_t> available_buffer_sizes (const std::string& device) const;
167 uint32_t available_input_channel_count (const std::string& device) const;
168 uint32_t available_output_channel_count (const std::string& device) const;
170 bool can_change_sample_rate_when_running () const;
171 bool can_change_buffer_size_when_running () const;
173 int set_device_name (const std::string&);
174 int set_sample_rate (float);
175 int set_buffer_size (uint32_t);
176 int set_interleaved (bool yn);
177 int set_input_channels (uint32_t);
178 int set_output_channels (uint32_t);
179 int set_systemic_input_latency (uint32_t);
180 int set_systemic_output_latency (uint32_t);
182 /* Retrieving parameters */
183 std::string device_name () const;
184 float sample_rate () const;
185 uint32_t buffer_size () const;
186 bool interleaved () const;
187 uint32_t input_channels () const;
188 uint32_t output_channels () const;
189 uint32_t systemic_input_latency () const;
190 uint32_t systemic_output_latency () const;
192 /* External control app */
193 std::string control_app_name () const { return std::string (); }
194 void launch_control_app () {}
197 std::vector<std::string> enumerate_midi_options () const;
198 int set_midi_option (const std::string&);
199 std::string midi_option () const;
203 int _start (bool for_latency_measurement);
206 int freewheel (bool);
207 float dsp_load () const;
208 size_t raw_buffer_size (DataType t);
211 pframes_t sample_time ();
212 pframes_t sample_time_at_cycle_start ();
213 pframes_t samples_since_cycle_start ();
215 int create_process_thread (boost::function<void()> func);
216 int join_process_threads ();
217 bool in_process_thread ();
218 uint32_t process_thread_count ();
220 void update_latencies ();
224 void* private_handle () const;
225 const std::string& my_name () const;
226 bool available () const;
227 uint32_t port_name_size () const;
229 int set_port_name (PortHandle, const std::string&);
230 std::string get_port_name (PortHandle) const;
231 PortHandle get_port_by_name (const std::string&) const;
233 int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>&) const;
235 DataType port_data_type (PortHandle) const;
237 PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
238 void unregister_port (PortHandle);
240 int connect (const std::string& src, const std::string& dst);
241 int disconnect (const std::string& src, const std::string& dst);
242 int connect (PortHandle, const std::string&);
243 int disconnect (PortHandle, const std::string&);
244 int disconnect_all (PortHandle);
246 bool connected (PortHandle, bool process_callback_safe);
247 bool connected_to (PortHandle, const std::string&, bool process_callback_safe);
248 bool physically_connected (PortHandle, bool process_callback_safe);
249 int get_connections (PortHandle, std::vector<std::string>&, bool process_callback_safe);
252 int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
253 int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
254 uint32_t get_midi_event_count (void* port_buffer);
255 void midi_clear (void* port_buffer);
259 bool can_monitor_input () const;
260 int request_input_monitoring (PortHandle, bool);
261 int ensure_input_monitoring (PortHandle, bool);
262 bool monitoring_input (PortHandle);
264 /* Latency management */
266 void set_latency_range (PortHandle, bool for_playback, LatencyRange);
267 LatencyRange get_latency_range (PortHandle, bool for_playback);
269 /* Discovering physical ports */
271 bool port_is_physical (PortHandle) const;
272 void get_physical_outputs (DataType type, std::vector<std::string>&);
273 void get_physical_inputs (DataType type, std::vector<std::string>&);
274 ChanCount n_physical_outputs () const;
275 ChanCount n_physical_inputs () const;
277 /* Getting access to the data buffer for a port */
279 void* get_buffer (PortHandle, pframes_t);
281 void* main_process_thread ();
284 std::string _instance_name;
287 bool _run; /* keep going or stop, ardour thread */
288 bool _active; /* is running, process thread */
291 void enumerate_midi_devices (std::vector<std::string> &) const;
292 std::string _audio_device;
293 std::string _midi_device;
295 /* audio device reservation */
296 ARDOUR::SystemExec *_device_reservation;
297 PBD::ScopedConnectionList _reservation_connection;
298 void reservation_stdout (std::string, size_t);
299 bool acquire_device(const char* device_name);
300 void release_device();
301 bool _reservation_succeeded;
304 size_t _samples_per_period;
305 size_t _periods_per_cycle;
307 static size_t _max_buffer_size;
312 uint32_t _systemic_audio_input_latency;
313 uint32_t _systemic_audio_output_latency;
314 uint32_t _systemic_midi_input_latency;
315 uint32_t _systemic_midi_output_latency;
317 uint64_t _processed_samples;
319 pthread_t _main_thread;
321 /* process threads */
322 static void* alsa_process_thread (void *);
323 std::vector<pthread_t> _threads;
326 AlsaAudioBackend* engine;
327 boost::function<void ()> f;
330 ThreadData (AlsaAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
331 : engine (e) , f (fp) , stacksize (stacksz) {}
335 PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
336 int register_system_audio_ports ();
337 int register_system_midi_ports ();
338 void unregister_system_ports ();
340 std::vector<AlsaPort *> _ports;
341 std::vector<AlsaPort *> _system_inputs;
342 std::vector<AlsaPort *> _system_outputs;
343 std::vector<AlsaPort *> _system_midi_in;
344 std::vector<AlsaPort *> _system_midi_out;
346 std::vector<AlsaRawMidiOut *> _rmidi_out;
347 std::vector<AlsaRawMidiIn *> _rmidi_in;
349 struct PortConnectData {
354 PortConnectData (const std::string& a, const std::string& b, bool c)
355 : a (a) , b (b) , c (c) {}
358 std::vector<PortConnectData *> _port_connection_queue;
359 pthread_mutex_t _port_callback_mutex;
360 bool _port_change_flag;
362 void port_connect_callback (const std::string& a, const std::string& b, bool conn) {
363 pthread_mutex_lock (&_port_callback_mutex);
364 _port_connection_queue.push_back(new PortConnectData(a, b, conn));
365 pthread_mutex_unlock (&_port_callback_mutex);
368 void port_connect_add_remove_callback () {
369 pthread_mutex_lock (&_port_callback_mutex);
370 _port_change_flag = true;
371 pthread_mutex_unlock (&_port_callback_mutex);
374 bool valid_port (PortHandle port) const {
375 return std::find (_ports.begin (), _ports.end (), (AlsaPort*)port) != _ports.end ();
378 AlsaPort * find_port (const std::string& port_name) const {
379 for (std::vector<AlsaPort*>::const_iterator it = _ports.begin (); it != _ports.end (); ++it) {
380 if ((*it)->name () == port_name) {
387 }; // class AlsaAudioBackend
391 #endif /* __libbackend_alsa_audiobackend_h__ */