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/types.h"
34 #include "ardour/audio_backend.h"
36 #include "zita-alsa-pcmi.h"
37 #include "alsa_rawmidi.h"
41 class AlsaAudioBackend;
45 AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size);
46 AlsaMidiEvent (const AlsaMidiEvent& other);
48 size_t size () const { return _size; };
49 pframes_t timestamp () const { return _timestamp; };
50 const unsigned char* const_data () const { return _data; };
51 unsigned char* data () { return _data; };
52 bool operator< (const AlsaMidiEvent &other) const { return timestamp () < other.timestamp (); };
59 typedef std::vector<boost::shared_ptr<AlsaMidiEvent> > AlsaMidiBuffer;
63 AlsaPort (AlsaAudioBackend &b, const std::string&, PortFlags);
67 const std::string& name () const { return _name; }
68 PortFlags flags () const { return _flags; }
70 int set_name (const std::string &name) { _name = name; return 0; }
72 virtual DataType type () const = 0;
74 bool is_input () const { return flags () & IsInput; }
75 bool is_output () const { return flags () & IsOutput; }
76 bool is_physical () const { return flags () & IsPhysical; }
77 bool is_terminal () const { return flags () & IsTerminal; }
78 bool is_connected () const { return _connections.size () != 0; }
79 bool is_connected (const AlsaPort *port) const;
80 bool is_physically_connected () const;
82 const std::vector<AlsaPort *>& get_connections () const { return _connections; }
84 int connect (AlsaPort *port);
85 int disconnect (AlsaPort *port);
86 void disconnect_all ();
88 virtual void* get_buffer (pframes_t nframes) = 0;
90 const LatencyRange& latency_range (bool for_playback) const
92 return for_playback ? _playback_latency_range : _capture_latency_range;
95 void set_latency_range (const LatencyRange &latency_range, bool for_playback)
99 _playback_latency_range = latency_range;
103 _capture_latency_range = latency_range;
108 AlsaAudioBackend &_alsa_backend;
110 const PortFlags _flags;
111 LatencyRange _capture_latency_range;
112 LatencyRange _playback_latency_range;
113 std::vector<AlsaPort*> _connections;
115 void _connect (AlsaPort* , bool);
116 void _disconnect (AlsaPort* , bool);
120 class AlsaAudioPort : public AlsaPort {
122 AlsaAudioPort (AlsaAudioBackend &b, const std::string&, PortFlags);
125 DataType type () const { return DataType::AUDIO; };
127 Sample* buffer () { return _buffer; }
128 const Sample* const_buffer () const { return _buffer; }
129 void* get_buffer (pframes_t nframes);
132 Sample _buffer[8192];
133 }; // class AlsaAudioPort
135 class AlsaMidiPort : public AlsaPort {
137 AlsaMidiPort (AlsaAudioBackend &b, const std::string&, PortFlags);
140 DataType type () const { return DataType::MIDI; };
142 void* get_buffer (pframes_t nframes);
143 const AlsaMidiBuffer const_buffer () const { return _buffer; }
146 AlsaMidiBuffer _buffer;
147 }; // class AlsaMidiPort
149 class AlsaAudioBackend : public AudioBackend {
150 friend class AlsaPort;
152 AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info);
153 ~AlsaAudioBackend ();
155 /* AUDIOBACKEND API */
157 std::string name () const;
158 bool is_realtime () const;
160 std::vector<DeviceStatus> enumerate_devices () const;
161 std::vector<float> available_sample_rates (const std::string& device) const;
162 std::vector<uint32_t> available_buffer_sizes (const std::string& device) const;
163 uint32_t available_input_channel_count (const std::string& device) const;
164 uint32_t available_output_channel_count (const std::string& device) const;
166 bool can_change_sample_rate_when_running () const;
167 bool can_change_buffer_size_when_running () const;
169 int set_device_name (const std::string&);
170 int set_sample_rate (float);
171 int set_buffer_size (uint32_t);
172 int set_interleaved (bool yn);
173 int set_input_channels (uint32_t);
174 int set_output_channels (uint32_t);
175 int set_systemic_input_latency (uint32_t);
176 int set_systemic_output_latency (uint32_t);
178 /* Retrieving parameters */
179 std::string device_name () const;
180 float sample_rate () const;
181 uint32_t buffer_size () const;
182 bool interleaved () const;
183 uint32_t input_channels () const;
184 uint32_t output_channels () const;
185 uint32_t systemic_input_latency () const;
186 uint32_t systemic_output_latency () const;
188 /* External control app */
189 std::string control_app_name () const { return std::string (); }
190 void launch_control_app () {}
193 std::vector<std::string> enumerate_midi_options () const;
194 int set_midi_option (const std::string&);
195 std::string midi_option () const;
199 int _start (bool for_latency_measurement);
202 int freewheel (bool);
203 float dsp_load () const;
204 size_t raw_buffer_size (DataType t);
207 pframes_t sample_time ();
208 pframes_t sample_time_at_cycle_start ();
209 pframes_t samples_since_cycle_start ();
211 int create_process_thread (boost::function<void()> func);
212 int join_process_threads ();
213 bool in_process_thread ();
214 uint32_t process_thread_count ();
216 void update_latencies ();
220 void* private_handle () const;
221 const std::string& my_name () const;
222 bool available () const;
223 uint32_t port_name_size () const;
225 int set_port_name (PortHandle, const std::string&);
226 std::string get_port_name (PortHandle) const;
227 PortHandle get_port_by_name (const std::string&) const;
229 int get_ports (const std::string& port_name_pattern, DataType type, PortFlags flags, std::vector<std::string>&) const;
231 DataType port_data_type (PortHandle) const;
233 PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
234 void unregister_port (PortHandle);
236 int connect (const std::string& src, const std::string& dst);
237 int disconnect (const std::string& src, const std::string& dst);
238 int connect (PortHandle, const std::string&);
239 int disconnect (PortHandle, const std::string&);
240 int disconnect_all (PortHandle);
242 bool connected (PortHandle, bool process_callback_safe);
243 bool connected_to (PortHandle, const std::string&, bool process_callback_safe);
244 bool physically_connected (PortHandle, bool process_callback_safe);
245 int get_connections (PortHandle, std::vector<std::string>&, bool process_callback_safe);
248 int midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index);
249 int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size);
250 uint32_t get_midi_event_count (void* port_buffer);
251 void midi_clear (void* port_buffer);
255 bool can_monitor_input () const;
256 int request_input_monitoring (PortHandle, bool);
257 int ensure_input_monitoring (PortHandle, bool);
258 bool monitoring_input (PortHandle);
260 /* Latency management */
262 void set_latency_range (PortHandle, bool for_playback, LatencyRange);
263 LatencyRange get_latency_range (PortHandle, bool for_playback);
265 /* Discovering physical ports */
267 bool port_is_physical (PortHandle) const;
268 void get_physical_outputs (DataType type, std::vector<std::string>&);
269 void get_physical_inputs (DataType type, std::vector<std::string>&);
270 ChanCount n_physical_outputs () const;
271 ChanCount n_physical_inputs () const;
273 /* Getting access to the data buffer for a port */
275 void* get_buffer (PortHandle, pframes_t);
277 void* main_process_thread ();
280 std::string _instance_name;
283 bool _run; /* keep going or stop, ardour thread */
284 bool _active; /* is running, process thread */
287 void enumerate_midi_devices (std::vector<std::string> &) const;
288 std::string _capture_device;
289 std::string _playback_device;
290 std::string _midi_device;
293 size_t _samples_per_period;
294 size_t _periods_per_cycle;
296 static size_t _max_buffer_size;
301 uint32_t _systemic_input_latency;
302 uint32_t _systemic_output_latency;
304 uint64_t _processed_samples;
306 pthread_t _main_thread;
308 /* process threads */
309 static void* alsa_process_thread (void *);
310 std::vector<pthread_t> _threads;
313 AlsaAudioBackend* engine;
314 boost::function<void ()> f;
317 ThreadData (AlsaAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
318 : engine (e) , f (fp) , stacksize (stacksz) {}
322 PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
323 int register_system_audio_ports ();
324 int register_system_midi_ports ();
325 void unregister_system_ports ();
327 std::vector<AlsaPort *> _ports;
328 std::vector<AlsaPort *> _system_inputs;
329 std::vector<AlsaPort *> _system_outputs;
330 std::vector<AlsaPort *> _system_midi_in;
331 std::vector<AlsaPort *> _system_midi_out;
333 std::vector<AlsaRawMidiOut *> _rmidi_out;
334 std::vector<AlsaRawMidiIn *> _rmidi_in;
336 struct PortConnectData {
341 PortConnectData (const std::string& a, const std::string& b, bool c)
342 : a (a) , b (b) , c (c) {}
345 std::vector<PortConnectData *> _port_connection_queue;
346 pthread_mutex_t _port_callback_mutex;
348 void port_connect_callback (const std::string& a, const std::string& b, bool conn) {
349 pthread_mutex_lock (&_port_callback_mutex);
350 _port_connection_queue.push_back(new PortConnectData(a, b, conn));
351 pthread_mutex_unlock (&_port_callback_mutex);
354 bool valid_port (PortHandle port) const {
355 return std::find (_ports.begin (), _ports.end (), (AlsaPort*)port) != _ports.end ();
358 AlsaPort * find_port (const std::string& port_name) const {
359 for (std::vector<AlsaPort*>::const_iterator it = _ports.begin (); it != _ports.end (); ++it) {
360 if ((*it)->name () == port_name) {
367 }; // class AlsaAudioBackend
371 #endif /* __libbackend_alsa_audiobackend_h__ */