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[pulseview.git] / pv / sigsession.cpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2012-14 Joel Holdsworth <joel@airwebreathe.org.uk>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
19  */
20
21 #ifdef ENABLE_DECODE
22 #include <libsigrokdecode/libsigrokdecode.h>
23 #endif
24
25 #include "sigsession.h"
26
27 #include "devicemanager.h"
28 #include "device/device.h"
29 #include "device/file.h"
30
31 #include "data/analog.h"
32 #include "data/analogsnapshot.h"
33 #include "data/decoderstack.h"
34 #include "data/logic.h"
35 #include "data/logicsnapshot.h"
36 #include "data/decode/decoder.h"
37
38 #include "view/analogsignal.h"
39 #include "view/decodetrace.h"
40 #include "view/logicsignal.h"
41
42 #include <assert.h>
43
44 #include <stdexcept>
45
46 #include <boost/foreach.hpp>
47
48 #include <sys/stat.h>
49
50 #include <QDebug>
51
52 using boost::dynamic_pointer_cast;
53 using boost::function;
54 using boost::lock_guard;
55 using boost::mutex;
56 using boost::shared_ptr;
57 using std::list;
58 using std::map;
59 using std::set;
60 using std::string;
61 using std::vector;
62
63 namespace pv {
64
65 // TODO: This should not be necessary
66 SigSession* SigSession::_session = NULL;
67
68 SigSession::SigSession(DeviceManager &device_manager) :
69         _device_manager(device_manager),
70         _capture_state(Stopped)
71 {
72         // TODO: This should not be necessary
73         _session = this;
74
75         set_default_device();
76 }
77
78 SigSession::~SigSession()
79 {
80         using pv::device::Device;
81
82         stop_capture();
83
84         if (_sampling_thread.joinable())
85                 _sampling_thread.join();
86
87         _dev_inst->release();
88
89         // TODO: This should not be necessary
90         _session = NULL;
91 }
92
93 shared_ptr<device::DevInst> SigSession::get_device() const
94 {
95         return _dev_inst;
96 }
97
98 void SigSession::set_device(
99         shared_ptr<device::DevInst> dev_inst) throw(QString)
100 {
101         using pv::device::Device;
102
103         // Ensure we are not capturing before setting the device
104         stop_capture();
105
106         if (_dev_inst) {
107                 sr_session_datafeed_callback_remove_all();
108                 _dev_inst->release();
109         }
110
111         _dev_inst = dev_inst;
112         _decode_traces.clear();
113
114         if (dev_inst) {
115                 dev_inst->use(this);
116                 sr_session_datafeed_callback_add(data_feed_in_proc, NULL);
117                 update_signals(dev_inst);
118         }
119 }
120
121 void SigSession::set_file(const string &name) throw(QString)
122 {
123         // Deselect the old device, because file type detection in File::create
124         // destroys the old session inside libsigrok.
125         set_device(shared_ptr<device::DevInst>());
126         set_device(shared_ptr<device::DevInst>(device::File::create(name)));
127 }
128
129 void SigSession::set_default_device()
130 {
131         shared_ptr<pv::device::DevInst> default_device;
132         const list< shared_ptr<device::Device> > &devices =
133                 _device_manager.devices();
134
135         if (!devices.empty()) {
136                 // Fall back to the first device in the list.
137                 default_device = devices.front();
138
139                 // Try and find the demo device and select that by default
140                 BOOST_FOREACH (shared_ptr<pv::device::Device> dev, devices)
141                         if (strcmp(dev->dev_inst()->driver->name,
142                                 "demo") == 0) {
143                                 default_device = dev;
144                                 break;
145                         }
146         }
147
148         set_device(default_device);
149 }
150
151 void SigSession::release_device(device::DevInst *dev_inst)
152 {
153         (void)dev_inst;
154         assert(_dev_inst.get() == dev_inst);
155
156         assert(_capture_state == Stopped);
157         _dev_inst = shared_ptr<device::DevInst>();
158 }
159
160 SigSession::capture_state SigSession::get_capture_state() const
161 {
162         lock_guard<mutex> lock(_sampling_mutex);
163         return _capture_state;
164 }
165
166 void SigSession::start_capture(function<void (const QString)> error_handler)
167 {
168         stop_capture();
169
170         // Check that a device instance has been selected.
171         if (!_dev_inst) {
172                 qDebug() << "No device selected";
173                 return;
174         }
175
176         assert(_dev_inst->dev_inst());
177
178         // Check that at least one probe is enabled
179         const GSList *l;
180         for (l = _dev_inst->dev_inst()->channels; l; l = l->next) {
181                 sr_channel *const probe = (sr_channel*)l->data;
182                 assert(probe);
183                 if (probe->enabled)
184                         break;
185         }
186
187         if (!l) {
188                 error_handler(tr("No channels enabled."));
189                 return;
190         }
191
192         // Begin the session
193         _sampling_thread = boost::thread(
194                 &SigSession::sample_thread_proc, this, _dev_inst,
195                         error_handler);
196 }
197
198 void SigSession::stop_capture()
199 {
200         if (get_capture_state() == Stopped)
201                 return;
202
203         sr_session_stop();
204
205         // Check that sampling stopped
206         if (_sampling_thread.joinable())
207                 _sampling_thread.join();
208 }
209
210 set< shared_ptr<data::SignalData> > SigSession::get_data() const
211 {
212         lock_guard<mutex> lock(_signals_mutex);
213         set< shared_ptr<data::SignalData> > data;
214         BOOST_FOREACH(const shared_ptr<view::Signal> sig, _signals) {
215                 assert(sig);
216                 data.insert(sig->data());
217         }
218
219         return data;
220 }
221
222 vector< shared_ptr<view::Signal> > SigSession::get_signals() const
223 {
224         lock_guard<mutex> lock(_signals_mutex);
225         return _signals;
226 }
227
228 #ifdef ENABLE_DECODE
229 bool SigSession::add_decoder(srd_decoder *const dec)
230 {
231         map<const srd_channel*, shared_ptr<view::LogicSignal> > probes;
232         shared_ptr<data::DecoderStack> decoder_stack;
233
234         try
235         {
236                 lock_guard<mutex> lock(_signals_mutex);
237
238                 // Create the decoder
239                 decoder_stack = shared_ptr<data::DecoderStack>(
240                         new data::DecoderStack(*this, dec));
241
242                 // Make a list of all the probes
243                 std::vector<const srd_channel*> all_probes;
244                 for(const GSList *i = dec->channels; i; i = i->next)
245                         all_probes.push_back((const srd_channel*)i->data);
246                 for(const GSList *i = dec->opt_channels; i; i = i->next)
247                         all_probes.push_back((const srd_channel*)i->data);
248
249                 // Auto select the initial probes
250                 BOOST_FOREACH(const srd_channel *pdch, all_probes)
251                         BOOST_FOREACH(shared_ptr<view::Signal> s, _signals)
252                         {
253                                 shared_ptr<view::LogicSignal> l =
254                                         dynamic_pointer_cast<view::LogicSignal>(s);
255                                 if (l && QString::fromUtf8(pdch->name).
256                                         toLower().contains(
257                                         l->get_name().toLower()))
258                                         probes[pdch] = l;
259                         }
260
261                 assert(decoder_stack);
262                 assert(!decoder_stack->stack().empty());
263                 assert(decoder_stack->stack().front());
264                 decoder_stack->stack().front()->set_probes(probes);
265
266                 // Create the decode signal
267                 shared_ptr<view::DecodeTrace> d(
268                         new view::DecodeTrace(*this, decoder_stack,
269                                 _decode_traces.size()));
270                 _decode_traces.push_back(d);
271         }
272         catch(std::runtime_error e)
273         {
274                 return false;
275         }
276
277         signals_changed();
278
279         // Do an initial decode
280         decoder_stack->begin_decode();
281
282         return true;
283 }
284
285 vector< shared_ptr<view::DecodeTrace> > SigSession::get_decode_signals() const
286 {
287         lock_guard<mutex> lock(_signals_mutex);
288         return _decode_traces;
289 }
290
291 void SigSession::remove_decode_signal(view::DecodeTrace *signal)
292 {
293         for (vector< shared_ptr<view::DecodeTrace> >::iterator i =
294                 _decode_traces.begin();
295                 i != _decode_traces.end();
296                 i++)
297                 if ((*i).get() == signal)
298                 {
299                         _decode_traces.erase(i);
300                         signals_changed();
301                         return;
302                 }
303 }
304 #endif
305
306 void SigSession::set_capture_state(capture_state state)
307 {
308         lock_guard<mutex> lock(_sampling_mutex);
309         const bool changed = _capture_state != state;
310         _capture_state = state;
311         if(changed)
312                 capture_state_changed(state);
313 }
314
315 void SigSession::update_signals(shared_ptr<device::DevInst> dev_inst)
316 {
317         assert(dev_inst);
318         assert(_capture_state == Stopped);
319
320         unsigned int logic_probe_count = 0;
321
322         // Clear the decode traces
323         _decode_traces.clear();
324
325         // Detect what data types we will receive
326         if(dev_inst) {
327                 assert(dev_inst->dev_inst());
328                 for (const GSList *l = dev_inst->dev_inst()->channels;
329                         l; l = l->next) {
330                         const sr_channel *const probe = (const sr_channel *)l->data;
331                         if (!probe->enabled)
332                                 continue;
333
334                         switch(probe->type) {
335                         case SR_CHANNEL_LOGIC:
336                                 logic_probe_count++;
337                                 break;
338                         }
339                 }
340         }
341
342         // Create data containers for the logic data snapshots
343         {
344                 lock_guard<mutex> data_lock(_data_mutex);
345
346                 _logic_data.reset();
347                 if (logic_probe_count != 0) {
348                         _logic_data.reset(new data::Logic(
349                                 logic_probe_count));
350                         assert(_logic_data);
351                 }
352         }
353
354         // Make the Signals list
355         do {
356                 lock_guard<mutex> lock(_signals_mutex);
357
358                 _signals.clear();
359
360                 if(!dev_inst)
361                         break;
362
363                 assert(dev_inst->dev_inst());
364                 for (const GSList *l = dev_inst->dev_inst()->channels;
365                         l; l = l->next) {
366                         shared_ptr<view::Signal> signal;
367                         sr_channel *const probe = (sr_channel *)l->data;
368                         assert(probe);
369
370                         switch(probe->type) {
371                         case SR_CHANNEL_LOGIC:
372                                 signal = shared_ptr<view::Signal>(
373                                         new view::LogicSignal(dev_inst,
374                                                 probe, _logic_data));
375                                 break;
376
377                         case SR_CHANNEL_ANALOG:
378                         {
379                                 shared_ptr<data::Analog> data(
380                                         new data::Analog());
381                                 signal = shared_ptr<view::Signal>(
382                                         new view::AnalogSignal(dev_inst,
383                                                 probe, data));
384                                 break;
385                         }
386
387                         default:
388                                 assert(0);
389                                 break;
390                         }
391
392                         assert(signal);
393                         _signals.push_back(signal);
394                 }
395
396         } while(0);
397
398         signals_changed();
399 }
400
401 shared_ptr<view::Signal> SigSession::signal_from_probe(
402         const sr_channel *probe) const
403 {
404         lock_guard<mutex> lock(_signals_mutex);
405         BOOST_FOREACH(shared_ptr<view::Signal> sig, _signals) {
406                 assert(sig);
407                 if (sig->probe() == probe)
408                         return sig;
409         }
410         return shared_ptr<view::Signal>();
411 }
412
413 void SigSession::read_sample_rate(const sr_dev_inst *const sdi)
414 {
415         GVariant *gvar;
416         uint64_t sample_rate = 0;
417
418         // Read out the sample rate
419         if(sdi->driver)
420         {
421                 const int ret = sr_config_get(sdi->driver, sdi, NULL,
422                         SR_CONF_SAMPLERATE, &gvar);
423                 if (ret != SR_OK) {
424                         qDebug("Failed to get samplerate\n");
425                         return;
426                 }
427
428                 sample_rate = g_variant_get_uint64(gvar);
429                 g_variant_unref(gvar);
430         }
431
432         // Set the sample rate of all data
433         const set< shared_ptr<data::SignalData> > data_set = get_data();
434         BOOST_FOREACH(shared_ptr<data::SignalData> data, data_set) {
435                 assert(data);
436                 data->set_samplerate(sample_rate);
437         }
438 }
439
440 void SigSession::sample_thread_proc(shared_ptr<device::DevInst> dev_inst,
441         function<void (const QString)> error_handler)
442 {
443         assert(dev_inst);
444         assert(dev_inst->dev_inst());
445         assert(error_handler);
446
447         read_sample_rate(dev_inst->dev_inst());
448
449         try {
450                 dev_inst->start();
451         } catch(const QString e) {
452                 error_handler(e);
453                 return;
454         }
455
456         set_capture_state(dev_inst->is_trigger_enabled() ?
457                 AwaitingTrigger : Running);
458
459         dev_inst->run();
460         set_capture_state(Stopped);
461
462         // Confirm that SR_DF_END was received
463         if (_cur_logic_snapshot)
464         {
465                 qDebug("SR_DF_END was not received.");
466                 assert(0);
467         }
468 }
469
470 void SigSession::feed_in_header(const sr_dev_inst *sdi)
471 {
472         read_sample_rate(sdi);
473 }
474
475 void SigSession::feed_in_meta(const sr_dev_inst *sdi,
476         const sr_datafeed_meta &meta)
477 {
478         (void)sdi;
479
480         for (const GSList *l = meta.config; l; l = l->next) {
481                 const sr_config *const src = (const sr_config*)l->data;
482                 switch (src->key) {
483                 case SR_CONF_SAMPLERATE:
484                         /// @todo handle samplerate changes
485                         /// samplerate = (uint64_t *)src->value;
486                         break;
487                 default:
488                         // Unknown metadata is not an error.
489                         break;
490                 }
491         }
492
493         signals_changed();
494 }
495
496 void SigSession::feed_in_frame_begin()
497 {
498         if (_cur_logic_snapshot || !_cur_analog_snapshots.empty())
499                 frame_began();
500 }
501
502 void SigSession::feed_in_logic(const sr_datafeed_logic &logic)
503 {
504         lock_guard<mutex> lock(_data_mutex);
505
506         if (!_logic_data)
507         {
508                 qDebug() << "Unexpected logic packet";
509                 return;
510         }
511
512         if (!_cur_logic_snapshot)
513         {
514                 // This could be the first packet after a trigger
515                 set_capture_state(Running);
516
517                 // Create a new data snapshot
518                 _cur_logic_snapshot = shared_ptr<data::LogicSnapshot>(
519                         new data::LogicSnapshot(logic, _dev_inst->get_sample_limit()));
520                 _logic_data->push_snapshot(_cur_logic_snapshot);
521
522                 // @todo Putting this here means that only listeners querying
523                 // for logic will be notified. Currently the only user of
524                 // frame_began is DecoderStack, but in future we need to signal
525                 // this after both analog and logic sweeps have begun.
526                 frame_began();
527         }
528         else
529         {
530                 // Append to the existing data snapshot
531                 _cur_logic_snapshot->append_payload(logic);
532         }
533
534         data_received();
535 }
536
537 void SigSession::feed_in_analog(const sr_datafeed_analog &analog)
538 {
539         lock_guard<mutex> lock(_data_mutex);
540
541         const unsigned int probe_count = g_slist_length(analog.channels);
542         const size_t sample_count = analog.num_samples / probe_count;
543         const float *data = analog.data;
544         bool sweep_beginning = false;
545
546         for (GSList *p = analog.channels; p; p = p->next)
547         {
548                 shared_ptr<data::AnalogSnapshot> snapshot;
549
550                 sr_channel *const probe = (sr_channel*)p->data;
551                 assert(probe);
552
553                 // Try to get the snapshot of the probe
554                 const map< const sr_channel*, shared_ptr<data::AnalogSnapshot> >::
555                         iterator iter = _cur_analog_snapshots.find(probe);
556                 if (iter != _cur_analog_snapshots.end())
557                         snapshot = (*iter).second;
558                 else
559                 {
560                         // If no snapshot was found, this means we havn't
561                         // created one yet. i.e. this is the first packet
562                         // in the sweep containing this snapshot.
563                         sweep_beginning = true;
564
565                         // Create a snapshot, keep it in the maps of probes
566                         snapshot = shared_ptr<data::AnalogSnapshot>(
567                                 new data::AnalogSnapshot(_dev_inst->get_sample_limit()));
568                         _cur_analog_snapshots[probe] = snapshot;
569
570                         // Find the annalog data associated with the probe
571                         shared_ptr<view::AnalogSignal> sig =
572                                 dynamic_pointer_cast<view::AnalogSignal>(
573                                         signal_from_probe(probe));
574                         assert(sig);
575
576                         shared_ptr<data::Analog> data(sig->analog_data());
577                         assert(data);
578
579                         // Push the snapshot into the analog data.
580                         data->push_snapshot(snapshot);
581                 }
582
583                 assert(snapshot);
584
585                 // Append the samples in the snapshot
586                 snapshot->append_interleaved_samples(data++, sample_count,
587                         probe_count);
588         }
589
590         if (sweep_beginning) {
591                 // This could be the first packet after a trigger
592                 set_capture_state(Running);
593         }
594
595         data_received();
596 }
597
598 void SigSession::data_feed_in(const struct sr_dev_inst *sdi,
599         const struct sr_datafeed_packet *packet)
600 {
601         assert(sdi);
602         assert(packet);
603
604         switch (packet->type) {
605         case SR_DF_HEADER:
606                 feed_in_header(sdi);
607                 break;
608
609         case SR_DF_META:
610                 assert(packet->payload);
611                 feed_in_meta(sdi,
612                         *(const sr_datafeed_meta*)packet->payload);
613                 break;
614
615         case SR_DF_FRAME_BEGIN:
616                 feed_in_frame_begin();
617                 break;
618
619         case SR_DF_LOGIC:
620                 assert(packet->payload);
621                 feed_in_logic(*(const sr_datafeed_logic*)packet->payload);
622                 break;
623
624         case SR_DF_ANALOG:
625                 assert(packet->payload);
626                 feed_in_analog(*(const sr_datafeed_analog*)packet->payload);
627                 break;
628
629         case SR_DF_END:
630         {
631                 {
632                         lock_guard<mutex> lock(_data_mutex);
633                         _cur_logic_snapshot.reset();
634                         _cur_analog_snapshots.clear();
635                 }
636                 frame_ended();
637                 break;
638         }
639         }
640 }
641
642 void SigSession::data_feed_in_proc(const struct sr_dev_inst *sdi,
643         const struct sr_datafeed_packet *packet, void *cb_data)
644 {
645         (void) cb_data;
646         assert(_session);
647         _session->data_feed_in(sdi, packet);
648 }
649
650 } // namespace pv