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);
181 int set_systemic_midi_input_latency (std::string const, uint32_t);
182 int set_systemic_midi_output_latency (std::string const, uint32_t);
184 /* Retrieving parameters */
185 std::string device_name () const;
186 float sample_rate () const;
187 uint32_t buffer_size () const;
188 bool interleaved () const;
189 uint32_t input_channels () const;
190 uint32_t output_channels () const;
191 uint32_t systemic_input_latency () const;
192 uint32_t systemic_output_latency () const;
193 uint32_t systemic_midi_input_latency (std::string const) const;
194 uint32_t systemic_midi_output_latency (std::string const) const;
196 bool can_set_systemic_midi_latencies () const { return true; }
198 /* External control app */
199 std::string control_app_name () const { return std::string (); }
200 void launch_control_app () {}
203 std::vector<std::string> enumerate_midi_options () const;
204 int set_midi_option (const std::string&);
205 std::string midi_option () const;
207 std::vector<DeviceStatus> enumerate_midi_devices () const;
208 int set_midi_device_enabled (std::string const, bool);
209 bool midi_device_enabled (std::string const) const;
213 int _start (bool for_latency_measurement);
216 int freewheel (bool);
217 float dsp_load () const;
218 size_t raw_buffer_size (DataType t);
221 pframes_t sample_time ();
222 pframes_t sample_time_at_cycle_start ();
223 pframes_t samples_since_cycle_start ();
225 int create_process_thread (boost::function<void()> func);
226 int join_process_threads ();
227 bool in_process_thread ();
228 uint32_t process_thread_count ();
230 void update_latencies ();
234 void* private_handle () const;
235 const std::string& my_name () const;
236 bool available () const;
237 uint32_t port_name_size () const;
239 int set_port_name (PortHandle, const std::string&);
240 std::string get_port_name (PortHandle) const;
241 PortHandle get_port_by_name (const std::string&) const;
243 int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>&) const;
245 DataType port_data_type (PortHandle) const;
247 PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
248 void unregister_port (PortHandle);
250 int connect (const std::string& src, const std::string& dst);
251 int disconnect (const std::string& src, const std::string& dst);
252 int connect (PortHandle, const std::string&);
253 int disconnect (PortHandle, const std::string&);
254 int disconnect_all (PortHandle);
256 bool connected (PortHandle, bool process_callback_safe);
257 bool connected_to (PortHandle, const std::string&, bool process_callback_safe);
258 bool physically_connected (PortHandle, bool process_callback_safe);
259 int get_connections (PortHandle, std::vector<std::string>&, bool process_callback_safe);
262 int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
263 int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
264 uint32_t get_midi_event_count (void* port_buffer);
265 void midi_clear (void* port_buffer);
269 bool can_monitor_input () const;
270 int request_input_monitoring (PortHandle, bool);
271 int ensure_input_monitoring (PortHandle, bool);
272 bool monitoring_input (PortHandle);
274 /* Latency management */
276 void set_latency_range (PortHandle, bool for_playback, LatencyRange);
277 LatencyRange get_latency_range (PortHandle, bool for_playback);
279 /* Discovering physical ports */
281 bool port_is_physical (PortHandle) const;
282 void get_physical_outputs (DataType type, std::vector<std::string>&);
283 void get_physical_inputs (DataType type, std::vector<std::string>&);
284 ChanCount n_physical_outputs () const;
285 ChanCount n_physical_inputs () const;
287 /* Getting access to the data buffer for a port */
289 void* get_buffer (PortHandle, pframes_t);
291 void* main_process_thread ();
294 std::string _instance_name;
297 bool _run; /* keep going or stop, ardour thread */
298 bool _active; /* is running, process thread */
300 bool _measure_latency;
302 std::string _audio_device;
303 std::string _midi_driver_option;
305 /* audio device reservation */
306 ARDOUR::SystemExec *_device_reservation;
307 PBD::ScopedConnectionList _reservation_connection;
308 void reservation_stdout (std::string, size_t);
309 bool acquire_device(const char* device_name);
310 void release_device();
311 bool _reservation_succeeded;
315 size_t _samples_per_period;
316 size_t _periods_per_cycle;
317 static size_t _max_buffer_size;
322 uint32_t _systemic_audio_input_latency;
323 uint32_t _systemic_audio_output_latency;
326 struct AlsaMidiDeviceInfo {
328 uint32_t systemic_input_latency;
329 uint32_t systemic_output_latency;
332 , systemic_input_latency (0)
333 , systemic_output_latency (0)
337 mutable std::map<std::string, struct AlsaMidiDeviceInfo *> _midi_devices;
338 struct AlsaMidiDeviceInfo * midi_device_info(std::string const) const;
342 uint64_t _processed_samples;
343 pthread_t _main_thread;
345 /* process threads */
346 static void* alsa_process_thread (void *);
347 std::vector<pthread_t> _threads;
350 AlsaAudioBackend* engine;
351 boost::function<void ()> f;
354 ThreadData (AlsaAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
355 : engine (e) , f (fp) , stacksize (stacksz) {}
359 PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
360 int register_system_audio_ports ();
361 int register_system_midi_ports ();
362 void unregister_system_ports ();
364 std::vector<AlsaPort *> _ports;
365 std::vector<AlsaPort *> _system_inputs;
366 std::vector<AlsaPort *> _system_outputs;
367 std::vector<AlsaPort *> _system_midi_in;
368 std::vector<AlsaPort *> _system_midi_out;
370 std::vector<AlsaRawMidiOut *> _rmidi_out;
371 std::vector<AlsaRawMidiIn *> _rmidi_in;
373 struct PortConnectData {
378 PortConnectData (const std::string& a, const std::string& b, bool c)
379 : a (a) , b (b) , c (c) {}
382 std::vector<PortConnectData *> _port_connection_queue;
383 pthread_mutex_t _port_callback_mutex;
384 bool _port_change_flag;
386 void port_connect_callback (const std::string& a, const std::string& b, bool conn) {
387 pthread_mutex_lock (&_port_callback_mutex);
388 _port_connection_queue.push_back(new PortConnectData(a, b, conn));
389 pthread_mutex_unlock (&_port_callback_mutex);
392 void port_connect_add_remove_callback () {
393 pthread_mutex_lock (&_port_callback_mutex);
394 _port_change_flag = true;
395 pthread_mutex_unlock (&_port_callback_mutex);
398 bool valid_port (PortHandle port) const {
399 return std::find (_ports.begin (), _ports.end (), (AlsaPort*)port) != _ports.end ();
402 AlsaPort * find_port (const std::string& port_name) const {
403 for (std::vector<AlsaPort*>::const_iterator it = _ports.begin (); it != _ports.end (); ++it) {
404 if ((*it)->name () == port_name) {
411 }; // class AlsaAudioBackend
415 #endif /* __libbackend_alsa_audiobackend_h__ */