pv/session.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 "session.hpp"
  26
  27 #include "devicemanager.hpp"
  28
  29 #include "data/analog.hpp"
  30 #include "data/analogsegment.hpp"
  31 #include "data/decoderstack.hpp"
  32 #include "data/logic.hpp"
  33 #include "data/logicsegment.hpp"
  34 #include "data/decode/decoder.hpp"
  35
  36 #include "devices/hardwaredevice.hpp"
  37 #include "devices/sessionfile.hpp"
  38
  39 #include "view/analogsignal.hpp"
  40 #include "view/decodetrace.hpp"
  41 #include "view/logicsignal.hpp"
  42
  43 #include <cassert>
  44 #include <mutex>
  45 #include <stdexcept>
  46
  47 #include <sys/stat.h>
  48
  49 #include <QDebug>
  50
  51 #include <libsigrokcxx/libsigrokcxx.hpp>
  52
  53 using boost::shared_lock;
  54 using boost::shared_mutex;
  55 using boost::unique_lock;
  56
  57 using std::dynamic_pointer_cast;
  58 using std::function;
  59 using std::lock_guard;
  60 using std::list;
  61 using std::map;
  62 using std::mutex;
  63 using std::recursive_mutex;
  64 using std::set;
  65 using std::shared_ptr;
  66 using std::string;
  67 using std::unordered_set;
  68 using std::vector;
  69
  70 using sigrok::Analog;
  71 using sigrok::Channel;
  72 using sigrok::ChannelType;
  73 using sigrok::ConfigKey;
  74 using sigrok::DatafeedCallbackFunction;
  75 using sigrok::Error;
  76 using sigrok::Header;
  77 using sigrok::Logic;
  78 using sigrok::Meta;
  79 using sigrok::Packet;
  80 using sigrok::PacketPayload;
  81 using sigrok::Session;
  82 using sigrok::SessionDevice;
  83
  84 using Glib::VariantBase;
  85 using Glib::Variant;
  86
  87 namespace pv {
  88 Session::Session(DeviceManager &device_manager) :
  89         device_manager_(device_manager),
  90         capture_state_(Stopped),
  91         cur_samplerate_(0)
  92 {
  93 }
  94
  95 Session::~Session()
  96 {
  97         // Stop and join to the thread
  98         stop_capture();
  99 }
 100
 101 DeviceManager& Session::device_manager()
 102 {
 103         return device_manager_;
 104 }
 105
 106 const DeviceManager& Session::device_manager() const
 107 {
 108         return device_manager_;
 109 }
 110
 111 shared_ptr<sigrok::Session> Session::session() const
 112 {
 113         if (!device_)
 114                 return shared_ptr<sigrok::Session>();
 115         return device_->session();
 116 }
 117
 118 shared_ptr<devices::Device> Session::device() const
 119 {
 120         return device_;
 121 }
 122
 123 void Session::set_device(shared_ptr<devices::Device> device)
 124 {
 125         assert(device);
 126
 127         // Ensure we are not capturing before setting the device
 128         stop_capture();
 129
 130         device_ = std::move(device);
 131         device_->create();
 132         device_->session()->add_datafeed_callback([=]
 133                 (shared_ptr<sigrok::Device> device, shared_ptr<Packet> packet) {
 134                         data_feed_in(device, packet);
 135                 });
 136         update_signals();
 137
 138         decode_traces_.clear();
 139
 140         device_selected();
 141 }
 142
 143 void Session::set_default_device()
 144 {
 145         const list< shared_ptr<devices::HardwareDevice> > &devices =
 146                 device_manager_.devices();
 147
 148         if (devices.empty())
 149                 return;
 150
 151         // Try and find the demo device and select that by default
 152         const auto iter = std::find_if(devices.begin(), devices.end(),
 153                 [] (const shared_ptr<devices::HardwareDevice> &d) {
 154                         return d->hardware_device()->driver()->name() ==
 155                         "demo"; });
 156         set_device((iter == devices.end()) ? devices.front() : *iter);
 157 }
 158
 159 Session::capture_state Session::get_capture_state() const
 160 {
 161         lock_guard<mutex> lock(sampling_mutex_);
 162         return capture_state_;
 163 }
 164
 165 void Session::start_capture(function<void (const QString)> error_handler)
 166 {
 167         stop_capture();
 168
 169         // Check that at least one channel is enabled
 170         assert(device_);
 171         const shared_ptr<sigrok::Device> sr_dev = device_->device();
 172         if (sr_dev) {
 173                 const auto channels = sr_dev->channels();
 174                 if (!std::any_of(channels.begin(), channels.end(),
 175                         [](shared_ptr<Channel> channel) {
 176                                 return channel->enabled(); })) {
 177                         error_handler(tr("No channels enabled."));
 178                         return;
 179                 }
 180         }
 181
 182         // Clear signal data
 183         for (const shared_ptr<data::SignalData> d : get_data())
 184                 d->clear();
 185
 186         // Begin the session
 187         sampling_thread_ = std::thread(
 188                 &Session::sample_thread_proc, this, device_,
 189                         error_handler);
 190 }
 191
 192 void Session::stop_capture()
 193 {
 194         if (get_capture_state() != Stopped)
 195                 device_->stop();
 196
 197         // Check that sampling stopped
 198         if (sampling_thread_.joinable())
 199                 sampling_thread_.join();
 200 }
 201
 202 set< shared_ptr<data::SignalData> > Session::get_data() const
 203 {
 204         shared_lock<shared_mutex> lock(signals_mutex_);
 205         set< shared_ptr<data::SignalData> > data;
 206         for (const shared_ptr<view::Signal> sig : signals_) {
 207                 assert(sig);
 208                 data.insert(sig->data());
 209         }
 210
 211         return data;
 212 }
 213
 214 boost::shared_mutex& Session::signals_mutex() const
 215 {
 216         return signals_mutex_;
 217 }
 218
 219 const unordered_set< shared_ptr<view::Signal> >& Session::signals() const
 220 {
 221         return signals_;
 222 }
 223
 224 #ifdef ENABLE_DECODE
 225 bool Session::add_decoder(srd_decoder *const dec)
 226 {
 227         map<const srd_channel*, shared_ptr<view::LogicSignal> > channels;
 228         shared_ptr<data::DecoderStack> decoder_stack;
 229
 230         try
 231         {
 232                 lock_guard<boost::shared_mutex> lock(signals_mutex_);
 233
 234                 // Create the decoder
 235                 decoder_stack = shared_ptr<data::DecoderStack>(
 236                         new data::DecoderStack(*this, dec));
 237
 238                 // Make a list of all the channels
 239                 std::vector<const srd_channel*> all_channels;
 240                 for (const GSList *i = dec->channels; i; i = i->next)
 241                         all_channels.push_back((const srd_channel*)i->data);
 242                 for (const GSList *i = dec->opt_channels; i; i = i->next)
 243                         all_channels.push_back((const srd_channel*)i->data);
 244
 245                 // Auto select the initial channels
 246                 for (const srd_channel *pdch : all_channels)
 247                         for (shared_ptr<view::Signal> s : signals_)
 248                         {
 249                                 shared_ptr<view::LogicSignal> l =
 250                                         dynamic_pointer_cast<view::LogicSignal>(s);
 251                                 if (l && QString::fromUtf8(pdch->name).
 252                                         toLower().contains(
 253                                         l->name().toLower()))
 254                                         channels[pdch] = l;
 255                         }
 256
 257                 assert(decoder_stack);
 258                 assert(!decoder_stack->stack().empty());
 259                 assert(decoder_stack->stack().front());
 260                 decoder_stack->stack().front()->set_channels(channels);
 261
 262                 // Create the decode signal
 263                 shared_ptr<view::DecodeTrace> d(
 264                         new view::DecodeTrace(*this, decoder_stack,
 265                                 decode_traces_.size()));
 266                 decode_traces_.push_back(d);
 267         }
 268         catch(std::runtime_error e)
 269         {
 270                 return false;
 271         }
 272
 273         signals_changed();
 274
 275         // Do an initial decode
 276         decoder_stack->begin_decode();
 277
 278         return true;
 279 }
 280
 281 vector< shared_ptr<view::DecodeTrace> > Session::get_decode_signals() const
 282 {
 283         shared_lock<shared_mutex> lock(signals_mutex_);
 284         return decode_traces_;
 285 }
 286
 287 void Session::remove_decode_signal(view::DecodeTrace *signal)
 288 {
 289         for (auto i = decode_traces_.begin(); i != decode_traces_.end(); i++)
 290                 if ((*i).get() == signal)
 291                 {
 292                         decode_traces_.erase(i);
 293                         signals_changed();
 294                         return;
 295                 }
 296 }
 297 #endif
 298
 299 void Session::set_capture_state(capture_state state)
 300 {
 301         lock_guard<mutex> lock(sampling_mutex_);
 302         const bool changed = capture_state_ != state;
 303         capture_state_ = state;
 304         if (changed)
 305                 capture_state_changed(state);
 306 }
 307
 308 void Session::update_signals()
 309 {
 310         assert(device_);
 311
 312         lock_guard<recursive_mutex> lock(data_mutex_);
 313
 314         const shared_ptr<sigrok::Device> sr_dev = device_->device();
 315         if (!sr_dev) {
 316                 signals_.clear();
 317                 logic_data_.reset();
 318                 return;
 319         }
 320
 321         // Detect what data types we will receive
 322         auto channels = sr_dev->channels();
 323         unsigned int logic_channel_count = std::count_if(
 324                 channels.begin(), channels.end(),
 325                 [] (shared_ptr<Channel> channel) {
 326                         return channel->type() == ChannelType::LOGIC; });
 327
 328         // Create data containers for the logic data segments
 329         {
 330                 lock_guard<recursive_mutex> data_lock(data_mutex_);
 331
 332                 if (logic_channel_count == 0) {
 333                         logic_data_.reset();
 334                 } else if (!logic_data_ ||
 335                         logic_data_->num_channels() != logic_channel_count) {
 336                         logic_data_.reset(new data::Logic(
 337                                 logic_channel_count));
 338                         assert(logic_data_);
 339                 }
 340         }
 341
 342         // Make the Signals list
 343         {
 344                 unique_lock<shared_mutex> lock(signals_mutex_);
 345
 346                 unordered_set< shared_ptr<view::Signal> > prev_sigs(signals_);
 347                 signals_.clear();
 348
 349                 for (auto channel : sr_dev->channels()) {
 350                         shared_ptr<view::Signal> signal;
 351
 352                         // Find the channel in the old signals
 353                         const auto iter = std::find_if(
 354                                 prev_sigs.cbegin(), prev_sigs.cend(),
 355                                 [&](const shared_ptr<view::Signal> &s) {
 356                                         return s->channel() == channel;
 357                                 });
 358                         if (iter != prev_sigs.end()) {
 359                                 // Copy the signal from the old set to the new
 360                                 signal = *iter;
 361                                 auto logic_signal = dynamic_pointer_cast<
 362                                         view::LogicSignal>(signal);
 363                                 if (logic_signal)
 364                                         logic_signal->set_logic_data(
 365                                                 logic_data_);
 366                         } else {
 367                                 // Create a new signal
 368                                 switch(channel->type()->id()) {
 369                                 case SR_CHANNEL_LOGIC:
 370                                         signal = shared_ptr<view::Signal>(
 371                                                 new view::LogicSignal(*this,
 372                                                         device_, channel,
 373                                                         logic_data_));
 374                                         break;
 375
 376                                 case SR_CHANNEL_ANALOG:
 377                                 {
 378                                         shared_ptr<data::Analog> data(
 379                                                 new data::Analog());
 380                                         signal = shared_ptr<view::Signal>(
 381                                                 new view::AnalogSignal(
 382                                                         *this, channel, data));
 383                                         break;
 384                                 }
 385
 386                                 default:
 387                                         assert(0);
 388                                         break;
 389                                 }
 390                         }
 391
 392                         assert(signal);
 393                         signals_.insert(signal);
 394                 }
 395         }
 396
 397         signals_changed();
 398 }
 399
 400 shared_ptr<view::Signal> Session::signal_from_channel(
 401         shared_ptr<Channel> channel) const
 402 {
 403         lock_guard<boost::shared_mutex> lock(signals_mutex_);
 404         for (shared_ptr<view::Signal> sig : signals_) {
 405                 assert(sig);
 406                 if (sig->channel() == channel)
 407                         return sig;
 408         }
 409         return shared_ptr<view::Signal>();
 410 }
 411
 412 void Session::sample_thread_proc(shared_ptr<devices::Device> device,
 413         function<void (const QString)> error_handler)
 414 {
 415         assert(device);
 416         assert(error_handler);
 417
 418         (void)device;
 419
 420         cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
 421
 422         try {
 423                 device_->start();
 424         } catch(Error e) {
 425                 error_handler(e.what());
 426                 return;
 427         }
 428
 429         set_capture_state(device_->session()->trigger() ?
 430                 AwaitingTrigger : Running);
 431
 432         device_->run();
 433         set_capture_state(Stopped);
 434
 435         // Confirm that SR_DF_END was received
 436         if (cur_logic_segment_)
 437         {
 438                 qDebug("SR_DF_END was not received.");
 439                 assert(0);
 440         }
 441 }
 442
 443 void Session::feed_in_header()
 444 {
 445         cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
 446 }
 447
 448 void Session::feed_in_meta(shared_ptr<Meta> meta)
 449 {
 450         for (auto entry : meta->config()) {
 451                 switch (entry.first->id()) {
 452                 case SR_CONF_SAMPLERATE:
 453                         /// @todo handle samplerate changes
 454                         break;
 455                 default:
 456                         // Unknown metadata is not an error.
 457                         break;
 458                 }
 459         }
 460
 461         signals_changed();
 462 }
 463
 464 void Session::feed_in_frame_begin()
 465 {
 466         if (cur_logic_segment_ || !cur_analog_segments_.empty())
 467                 frame_began();
 468 }
 469
 470 void Session::feed_in_logic(shared_ptr<Logic> logic)
 471 {
 472         lock_guard<recursive_mutex> lock(data_mutex_);
 473
 474         const size_t sample_count = logic->data_length() / logic->unit_size();
 475
 476         if (!logic_data_)
 477         {
 478                 // The only reason logic_data_ would not have been created is
 479                 // if it was not possible to determine the signals when the
 480                 // device was created.
 481                 update_signals();
 482         }
 483
 484         if (!cur_logic_segment_)
 485         {
 486                 // This could be the first packet after a trigger
 487                 set_capture_state(Running);
 488
 489                 // Create a new data segment
 490                 cur_logic_segment_ = shared_ptr<data::LogicSegment>(
 491                         new data::LogicSegment(
 492                                 logic, cur_samplerate_, sample_count));
 493                 logic_data_->push_segment(cur_logic_segment_);
 494
 495                 // @todo Putting this here means that only listeners querying
 496                 // for logic will be notified. Currently the only user of
 497                 // frame_began is DecoderStack, but in future we need to signal
 498                 // this after both analog and logic sweeps have begun.
 499                 frame_began();
 500         }
 501         else
 502         {
 503                 // Append to the existing data segment
 504                 cur_logic_segment_->append_payload(logic);
 505         }
 506
 507         data_received();
 508 }
 509
 510 void Session::feed_in_analog(shared_ptr<Analog> analog)
 511 {
 512         lock_guard<recursive_mutex> lock(data_mutex_);
 513
 514         const vector<shared_ptr<Channel>> channels = analog->channels();
 515         const unsigned int channel_count = channels.size();
 516         const size_t sample_count = analog->num_samples() / channel_count;
 517         const float *data = analog->data_pointer();
 518         bool sweep_beginning = false;
 519
 520         for (auto channel : channels)
 521         {
 522                 shared_ptr<data::AnalogSegment> segment;
 523
 524                 // Try to get the segment of the channel
 525                 const map< shared_ptr<Channel>, shared_ptr<data::AnalogSegment> >::
 526                         iterator iter = cur_analog_segments_.find(channel);
 527                 if (iter != cur_analog_segments_.end())
 528                         segment = (*iter).second;
 529                 else
 530                 {
 531                         // If no segment was found, this means we havn't
 532                         // created one yet. i.e. this is the first packet
 533                         // in the sweep containing this segment.
 534                         sweep_beginning = true;
 535
 536                         // Create a segment, keep it in the maps of channels
 537                         segment = shared_ptr<data::AnalogSegment>(
 538                                 new data::AnalogSegment(
 539                                         cur_samplerate_, sample_count));
 540                         cur_analog_segments_[channel] = segment;
 541
 542                         // Find the analog data associated with the channel
 543                         shared_ptr<view::AnalogSignal> sig =
 544                                 dynamic_pointer_cast<view::AnalogSignal>(
 545                                         signal_from_channel(channel));
 546                         assert(sig);
 547
 548                         shared_ptr<data::Analog> data(sig->analog_data());
 549                         assert(data);
 550
 551                         // Push the segment into the analog data.
 552                         data->push_segment(segment);
 553                 }
 554
 555                 assert(segment);
 556
 557                 // Append the samples in the segment
 558                 segment->append_interleaved_samples(data++, sample_count,
 559                         channel_count);
 560         }
 561
 562         if (sweep_beginning) {
 563                 // This could be the first packet after a trigger
 564                 set_capture_state(Running);
 565         }
 566
 567         data_received();
 568 }
 569
 570 void Session::data_feed_in(shared_ptr<sigrok::Device> device,
 571         shared_ptr<Packet> packet)
 572 {
 573         (void)device;
 574
 575         assert(device);
 576         assert(device == device_->device());
 577         assert(packet);
 578
 579         switch (packet->type()->id()) {
 580         case SR_DF_HEADER:
 581                 feed_in_header();
 582                 break;
 583
 584         case SR_DF_META:
 585                 feed_in_meta(dynamic_pointer_cast<Meta>(packet->payload()));
 586                 break;
 587
 588         case SR_DF_FRAME_BEGIN:
 589                 feed_in_frame_begin();
 590                 break;
 591
 592         case SR_DF_LOGIC:
 593                 feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
 594                 break;
 595
 596         case SR_DF_ANALOG:
 597                 feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
 598                 break;
 599
 600         case SR_DF_END:
 601         {
 602                 {
 603                         lock_guard<recursive_mutex> lock(data_mutex_);
 604                         cur_logic_segment_.reset();
 605                         cur_analog_segments_.clear();
 606                 }
 607                 frame_ended();
 608                 break;
 609         }
 610         default:
 611                 break;
 612         }
 613 }
 614
 615 } // namespace pv