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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifdef _WIN32
  21 // Windows: Avoid boost/thread namespace pollution (which includes windows.h).
  22 #define NOGDI
  23 #define NORESOURCE
  24 #endif
  25 #include <boost/thread/locks.hpp>
  26 #include <boost/thread/shared_mutex.hpp>
  27
  28 #include <QFileInfo>
  29
  30 #include <cassert>
  31 #include <mutex>
  32 #include <stdexcept>
  33
  34 #include <sys/stat.h>
  35
  36 #include "session.hpp"
  37 #include "devicemanager.hpp"
  38
  39 #include "data/analog.hpp"
  40 #include "data/analogsegment.hpp"
  41 #include "data/decoderstack.hpp"
  42 #include "data/logic.hpp"
  43 #include "data/logicsegment.hpp"
  44 #include "data/signalbase.hpp"
  45 #include "data/decode/decoder.hpp"
  46
  47 #include "devices/hardwaredevice.hpp"
  48 #include "devices/inputfile.hpp"
  49 #include "devices/sessionfile.hpp"
  50
  51 #include "toolbars/mainbar.hpp"
  52
  53 #include "view/analogsignal.hpp"
  54 #include "view/decodetrace.hpp"
  55 #include "view/logicsignal.hpp"
  56 #include "view/signal.hpp"
  57 #include "view/view.hpp"
  58
  59 #include <libsigrokcxx/libsigrokcxx.hpp>
  60
  61 #ifdef ENABLE_DECODE
  62 #include <libsigrokdecode/libsigrokdecode.h>
  63 #endif
  64
  65 using boost::shared_lock;
  66 using boost::shared_mutex;
  67 using boost::unique_lock;
  68
  69 using std::dynamic_pointer_cast;
  70 using std::function;
  71 using std::lock_guard;
  72 using std::list;
  73 using std::map;
  74 using std::mutex;
  75 using std::pair;
  76 using std::recursive_mutex;
  77 using std::set;
  78 using std::shared_ptr;
  79 using std::make_shared;
  80 using std::string;
  81 using std::unordered_set;
  82 using std::vector;
  83
  84 using sigrok::Analog;
  85 using sigrok::Channel;
  86 using sigrok::ChannelType;
  87 using sigrok::ConfigKey;
  88 using sigrok::DatafeedCallbackFunction;
  89 using sigrok::Error;
  90 using sigrok::Header;
  91 using sigrok::InputFormat;
  92 using sigrok::Logic;
  93 using sigrok::Meta;
  94 using sigrok::OutputFormat;
  95 using sigrok::Packet;
  96 using sigrok::PacketPayload;
  97 using sigrok::Session;
  98 using sigrok::SessionDevice;
  99
 100 using Glib::VariantBase;
 101 using Glib::Variant;
 102
 103 namespace pv {
 104 Session::Session(DeviceManager &device_manager, QString name) :
 105         device_manager_(device_manager),
 106         default_name_(name),
 107         name_(name),
 108         capture_state_(Stopped),
 109         cur_samplerate_(0),
 110         data_saved_(true)
 111 {
 112 }
 113
 114 Session::~Session()
 115 {
 116         // Stop and join to the thread
 117         stop_capture();
 118 }
 119
 120 DeviceManager& Session::device_manager()
 121 {
 122         return device_manager_;
 123 }
 124
 125 const DeviceManager& Session::device_manager() const
 126 {
 127         return device_manager_;
 128 }
 129
 130 shared_ptr<sigrok::Session> Session::session() const
 131 {
 132         if (!device_)
 133                 return shared_ptr<sigrok::Session>();
 134         return device_->session();
 135 }
 136
 137 shared_ptr<devices::Device> Session::device() const
 138 {
 139         return device_;
 140 }
 141
 142 QString Session::name() const
 143 {
 144         return name_;
 145 }
 146
 147 void Session::set_name(QString name)
 148 {
 149         if (default_name_.isEmpty())
 150                 default_name_ = name;
 151
 152         name_ = name;
 153
 154         name_changed();
 155 }
 156
 157 const std::list< std::shared_ptr<views::ViewBase> > Session::views() const
 158 {
 159         return views_;
 160 }
 161
 162 std::shared_ptr<views::ViewBase> Session::main_view() const
 163 {
 164         return main_view_;
 165 }
 166
 167 void Session::set_main_bar(std::shared_ptr<pv::toolbars::MainBar> main_bar)
 168 {
 169         main_bar_ = main_bar;
 170 }
 171
 172 shared_ptr<pv::toolbars::MainBar> Session::main_bar() const
 173 {
 174         return main_bar_;
 175 }
 176
 177 bool Session::data_saved() const
 178 {
 179         return data_saved_;
 180 }
 181
 182 void Session::save_settings(QSettings &settings) const
 183 {
 184         map<string, string> dev_info;
 185         list<string> key_list;
 186         int stacks = 0, views = 0;
 187
 188         if (device_) {
 189                 shared_ptr<devices::HardwareDevice> hw_device =
 190                         dynamic_pointer_cast< devices::HardwareDevice >(device_);
 191
 192                 if (hw_device) {
 193                         settings.setValue("device_type", "hardware");
 194                         settings.beginGroup("device");
 195
 196                         key_list.emplace_back("vendor");
 197                         key_list.emplace_back("model");
 198                         key_list.emplace_back("version");
 199                         key_list.emplace_back("serial_num");
 200                         key_list.emplace_back("connection_id");
 201
 202                         dev_info = device_manager_.get_device_info(device_);
 203
 204                         for (string key : key_list) {
 205                                 if (dev_info.count(key))
 206                                         settings.setValue(QString::fromUtf8(key.c_str()),
 207                                                         QString::fromUtf8(dev_info.at(key).c_str()));
 208                                 else
 209                                         settings.remove(QString::fromUtf8(key.c_str()));
 210                         }
 211
 212                         settings.endGroup();
 213                 }
 214
 215                 shared_ptr<devices::SessionFile> sessionfile_device =
 216                         dynamic_pointer_cast< devices::SessionFile >(device_);
 217
 218                 if (sessionfile_device) {
 219                         settings.setValue("device_type", "sessionfile");
 220                         settings.beginGroup("device");
 221                         settings.setValue("filename", QString::fromStdString(
 222                                 sessionfile_device->full_name()));
 223                         settings.endGroup();
 224                 }
 225
 226                 // Save channels and decoders
 227                 for (shared_ptr<data::SignalBase> base : signalbases_) {
 228 #ifdef ENABLE_DECODE
 229                         if (base->is_decode_signal()) {
 230                                 shared_ptr<pv::data::DecoderStack> decoder_stack =
 231                                                 base->decoder_stack();
 232                                 std::shared_ptr<data::decode::Decoder> top_decoder =
 233                                                 decoder_stack->stack().front();
 234
 235                                 settings.beginGroup("decoder_stack" + QString::number(stacks++));
 236                                 settings.setValue("id", top_decoder->decoder()->id);
 237                                 settings.setValue("name", top_decoder->decoder()->name);
 238                                 settings.endGroup();
 239                         } else
 240 #endif
 241                         {
 242                                 settings.beginGroup(base->internal_name());
 243                                 base->save_settings(settings);
 244                                 settings.endGroup();
 245                         }
 246                 }
 247
 248                 settings.setValue("decoder_stacks", stacks);
 249
 250                 // Save view states and their signal settings
 251                 // Note: main_view must be saved as view0
 252                 settings.beginGroup("view" + QString::number(views++));
 253                 main_view_->save_settings(settings);
 254                 settings.endGroup();
 255
 256                 for (shared_ptr<views::ViewBase> view : views_) {
 257                         if (view != main_view_) {
 258                                 settings.beginGroup("view" + QString::number(views++));
 259                                 view->save_settings(settings);
 260                                 settings.endGroup();
 261                         }
 262                 }
 263
 264                 settings.setValue("views", views);
 265         }
 266 }
 267
 268 void Session::restore_settings(QSettings &settings)
 269 {
 270         shared_ptr<devices::Device> device;
 271
 272         QString device_type = settings.value("device_type").toString();
 273
 274         if (device_type == "hardware") {
 275                 map<string, string> dev_info;
 276                 list<string> key_list;
 277
 278                 // Re-select last used device if possible but only if it's not demo
 279                 settings.beginGroup("device");
 280                 key_list.emplace_back("vendor");
 281                 key_list.emplace_back("model");
 282                 key_list.emplace_back("version");
 283                 key_list.emplace_back("serial_num");
 284                 key_list.emplace_back("connection_id");
 285
 286                 for (string key : key_list) {
 287                         const QString k = QString::fromStdString(key);
 288                         if (!settings.contains(k))
 289                                 continue;
 290
 291                         const string value = settings.value(k).toString().toStdString();
 292                         if (!value.empty())
 293                                 dev_info.insert(std::make_pair(key, value));
 294                 }
 295
 296                 if (dev_info.count("model") > 0)
 297                         device = device_manager_.find_device_from_info(dev_info);
 298
 299                 if (device)
 300                         set_device(device);
 301
 302                 settings.endGroup();
 303         }
 304
 305         if (device_type == "sessionfile") {
 306                 settings.beginGroup("device");
 307                 QString filename = settings.value("filename").toString();
 308                 settings.endGroup();
 309
 310                 if (QFileInfo(filename).isReadable()) {
 311                         device = make_shared<devices::SessionFile>(device_manager_.context(),
 312                                 filename.toStdString());
 313                         set_device(device);
 314
 315                         // TODO Perform error handling
 316                         start_capture([](QString infoMessage) { (void)infoMessage; });
 317
 318                         set_name(QFileInfo(filename).fileName());
 319                 }
 320         }
 321
 322         if (device) {
 323                 // Restore channels
 324                 for (shared_ptr<data::SignalBase> base : signalbases_) {
 325                         settings.beginGroup(base->internal_name());
 326                         base->restore_settings(settings);
 327                         settings.endGroup();
 328                 }
 329
 330                 // Restore decoders
 331 #ifdef ENABLE_DECODE
 332                 int stacks = settings.value("decoder_stacks").toInt();
 333
 334                 for (int i = 0; i < stacks; i++) {
 335                         settings.beginGroup("decoder_stack" + QString::number(i++));
 336
 337                         QString id = settings.value("id").toString();
 338                         add_decoder(srd_decoder_get_by_id(id.toStdString().c_str()));
 339
 340                         settings.endGroup();
 341                 }
 342 #endif
 343
 344                 // Restore views
 345                 int views = settings.value("views").toInt();
 346
 347                 for (int i = 0; i < views; i++) {
 348                         settings.beginGroup("view" + QString::number(i));
 349
 350                         if (i > 0) {
 351                                 views::ViewType type = (views::ViewType)settings.value("type").toInt();
 352                                 add_view(name_, type, this);
 353                                 views_.back()->restore_settings(settings);
 354                         } else
 355                                 main_view_->restore_settings(settings);
 356
 357                         settings.endGroup();
 358                 }
 359         }
 360 }
 361
 362 void Session::select_device(shared_ptr<devices::Device> device)
 363 {
 364         try {
 365                 if (device)
 366                         set_device(device);
 367                 else
 368                         set_default_device();
 369         } catch (const QString &e) {
 370                 main_bar_->session_error(tr("Failed to Select Device"),
 371                         tr("Failed to Select Device"));
 372         }
 373 }
 374
 375 void Session::set_device(shared_ptr<devices::Device> device)
 376 {
 377         assert(device);
 378
 379         // Ensure we are not capturing before setting the device
 380         stop_capture();
 381
 382         if (device_)
 383                 device_->close();
 384
 385         device_.reset();
 386
 387         // Revert name back to default name (e.g. "Session 1") as the data is gone
 388         name_ = default_name_;
 389         name_changed();
 390
 391         // Remove all stored data
 392         for (std::shared_ptr<views::ViewBase> view : views_) {
 393                 view->clear_signals();
 394 #ifdef ENABLE_DECODE
 395                 view->clear_decode_signals();
 396 #endif
 397         }
 398         for (const shared_ptr<data::SignalData> d : all_signal_data_)
 399                 d->clear();
 400         all_signal_data_.clear();
 401         signalbases_.clear();
 402         cur_logic_segment_.reset();
 403
 404         for (auto entry : cur_analog_segments_) {
 405                 shared_ptr<sigrok::Channel>(entry.first).reset();
 406                 shared_ptr<data::AnalogSegment>(entry.second).reset();
 407         }
 408
 409         logic_data_.reset();
 410
 411         signals_changed();
 412
 413         device_ = std::move(device);
 414
 415         try {
 416                 device_->open();
 417         } catch (const QString &e) {
 418                 device_.reset();
 419         }
 420
 421         if (device_) {
 422                 device_->session()->add_datafeed_callback([=]
 423                         (shared_ptr<sigrok::Device> device, shared_ptr<Packet> packet) {
 424                                 data_feed_in(device, packet);
 425                         });
 426
 427                 update_signals();
 428         }
 429
 430         device_changed();
 431 }
 432
 433 void Session::set_default_device()
 434 {
 435         const list< shared_ptr<devices::HardwareDevice> > &devices =
 436                 device_manager_.devices();
 437
 438         if (devices.empty())
 439                 return;
 440
 441         // Try and find the demo device and select that by default
 442         const auto iter = std::find_if(devices.begin(), devices.end(),
 443                 [] (const shared_ptr<devices::HardwareDevice> &d) {
 444                         return d->hardware_device()->driver()->name() ==
 445                         "demo"; });
 446         set_device((iter == devices.end()) ? devices.front() : *iter);
 447 }
 448
 449 void Session::load_init_file(const std::string &file_name,
 450         const std::string &format)
 451 {
 452         shared_ptr<InputFormat> input_format;
 453
 454         if (!format.empty()) {
 455                 const map<string, shared_ptr<InputFormat> > formats =
 456                         device_manager_.context()->input_formats();
 457                 const auto iter = find_if(formats.begin(), formats.end(),
 458                         [&](const pair<string, shared_ptr<InputFormat> > f) {
 459                                 return f.first == format; });
 460                 if (iter == formats.end()) {
 461                         main_bar_->session_error(tr("Error"),
 462                                 tr("Unexpected input format: %s").arg(QString::fromStdString(format)));
 463                         return;
 464                 }
 465
 466                 input_format = (*iter).second;
 467         }
 468
 469         load_file(QString::fromStdString(file_name), input_format);
 470 }
 471
 472 void Session::load_file(QString file_name,
 473         std::shared_ptr<sigrok::InputFormat> format,
 474         const std::map<std::string, Glib::VariantBase> &options)
 475 {
 476         const QString errorMessage(
 477                 QString("Failed to load file %1").arg(file_name));
 478
 479         try {
 480                 if (format)
 481                         set_device(shared_ptr<devices::Device>(
 482                                 new devices::InputFile(
 483                                         device_manager_.context(),
 484                                         file_name.toStdString(),
 485                                         format, options)));
 486                 else
 487                         set_device(shared_ptr<devices::Device>(
 488                                 new devices::SessionFile(
 489                                         device_manager_.context(),
 490                                         file_name.toStdString())));
 491         } catch (Error e) {
 492                 main_bar_->session_error(tr("Failed to load ") + file_name, e.what());
 493                 set_default_device();
 494                 main_bar_->update_device_list();
 495                 return;
 496         }
 497
 498         main_bar_->update_device_list();
 499
 500         start_capture([&, errorMessage](QString infoMessage) {
 501                 main_bar_->session_error(errorMessage, infoMessage); });
 502
 503         set_name(QFileInfo(file_name).fileName());
 504 }
 505
 506 Session::capture_state Session::get_capture_state() const
 507 {
 508         lock_guard<mutex> lock(sampling_mutex_);
 509         return capture_state_;
 510 }
 511
 512 void Session::start_capture(function<void (const QString)> error_handler)
 513 {
 514         if (!device_) {
 515                 error_handler(tr("No active device set, can't start acquisition."));
 516                 return;
 517         }
 518
 519         stop_capture();
 520
 521         // Check that at least one channel is enabled
 522         const shared_ptr<sigrok::Device> sr_dev = device_->device();
 523         if (sr_dev) {
 524                 const auto channels = sr_dev->channels();
 525                 if (!std::any_of(channels.begin(), channels.end(),
 526                         [](shared_ptr<Channel> channel) {
 527                                 return channel->enabled(); })) {
 528                         error_handler(tr("No channels enabled."));
 529                         return;
 530                 }
 531         }
 532
 533         // Clear signal data
 534         for (const shared_ptr<data::SignalData> d : all_signal_data_)
 535                 d->clear();
 536
 537         // Revert name back to default name (e.g. "Session 1") for real devices
 538         // as the (possibly saved) data is gone. File devices keep their name.
 539         shared_ptr<devices::HardwareDevice> hw_device =
 540                 dynamic_pointer_cast< devices::HardwareDevice >(device_);
 541
 542         if (hw_device) {
 543                 name_ = default_name_;
 544                 name_changed();
 545         }
 546
 547         // Begin the session
 548         sampling_thread_ = std::thread(
 549                 &Session::sample_thread_proc, this, error_handler);
 550 }
 551
 552 void Session::stop_capture()
 553 {
 554         if (get_capture_state() != Stopped)
 555                 device_->stop();
 556
 557         // Check that sampling stopped
 558         if (sampling_thread_.joinable())
 559                 sampling_thread_.join();
 560 }
 561
 562 void Session::register_view(std::shared_ptr<views::ViewBase> view)
 563 {
 564         if (views_.empty()) {
 565                 main_view_ = view;
 566         }
 567
 568         views_.push_back(view);
 569
 570         update_signals();
 571 }
 572
 573 void Session::deregister_view(std::shared_ptr<views::ViewBase> view)
 574 {
 575         views_.remove_if([&](std::shared_ptr<views::ViewBase> v) {
 576                 return v == view; });
 577
 578         if (views_.empty()) {
 579                 main_view_.reset();
 580
 581                 // Without a view there can be no main bar
 582                 main_bar_.reset();
 583         }
 584 }
 585
 586 bool Session::has_view(std::shared_ptr<views::ViewBase> view)
 587 {
 588         for (std::shared_ptr<views::ViewBase> v : views_)
 589                 if (v == view)
 590                         return true;
 591
 592         return false;
 593 }
 594
 595 double Session::get_samplerate() const
 596 {
 597         double samplerate = 0.0;
 598
 599         for (const shared_ptr<pv::data::SignalData> d : all_signal_data_) {
 600                 assert(d);
 601                 const vector< shared_ptr<pv::data::Segment> > segments =
 602                         d->segments();
 603                 for (const shared_ptr<pv::data::Segment> &s : segments)
 604                         samplerate = std::max(samplerate, s->samplerate());
 605         }
 606         // If there is no sample rate given we use samples as unit
 607         if (samplerate == 0.0)
 608                 samplerate = 1.0;
 609
 610         return samplerate;
 611 }
 612
 613 const std::unordered_set< std::shared_ptr<data::SignalBase> >
 614         Session::signalbases() const
 615 {
 616         return signalbases_;
 617 }
 618
 619 #ifdef ENABLE_DECODE
 620 bool Session::add_decoder(srd_decoder *const dec)
 621 {
 622         map<const srd_channel*, shared_ptr<data::SignalBase> > channels;
 623         shared_ptr<data::DecoderStack> decoder_stack;
 624
 625         try {
 626                 // Create the decoder
 627                 decoder_stack = make_shared<data::DecoderStack>(*this, dec);
 628
 629                 // Make a list of all the channels
 630                 std::vector<const srd_channel*> all_channels;
 631                 for (const GSList *i = dec->channels; i; i = i->next)
 632                         all_channels.push_back((const srd_channel*)i->data);
 633                 for (const GSList *i = dec->opt_channels; i; i = i->next)
 634                         all_channels.push_back((const srd_channel*)i->data);
 635
 636                 // Auto select the initial channels
 637                 for (const srd_channel *pdch : all_channels)
 638                         for (shared_ptr<data::SignalBase> b : signalbases_) {
 639                                 if (b->type() == ChannelType::LOGIC) {
 640                                         if (QString::fromUtf8(pdch->name).toLower().
 641                                                 contains(b->name().toLower()))
 642                                                 channels[pdch] = b;
 643                                 }
 644                         }
 645
 646                 assert(decoder_stack);
 647                 assert(!decoder_stack->stack().empty());
 648                 assert(decoder_stack->stack().front());
 649                 decoder_stack->stack().front()->set_channels(channels);
 650
 651                 // Create the decode signal
 652                 shared_ptr<data::SignalBase> signalbase =
 653                         make_shared<data::SignalBase>(nullptr);
 654
 655                 signalbase->set_decoder_stack(decoder_stack);
 656                 signalbases_.insert(signalbase);
 657
 658                 for (std::shared_ptr<views::ViewBase> view : views_)
 659                         view->add_decode_signal(signalbase);
 660         } catch (std::runtime_error e) {
 661                 return false;
 662         }
 663
 664         signals_changed();
 665
 666         // Do an initial decode
 667         decoder_stack->begin_decode();
 668
 669         return true;
 670 }
 671
 672 void Session::remove_decode_signal(shared_ptr<data::SignalBase> signalbase)
 673 {
 674         signalbases_.erase(signalbase);
 675
 676         for (std::shared_ptr<views::ViewBase> view : views_)
 677                 view->remove_decode_signal(signalbase);
 678
 679         signals_changed();
 680 }
 681 #endif
 682
 683 void Session::set_capture_state(capture_state state)
 684 {
 685         bool changed;
 686
 687         {
 688                 lock_guard<mutex> lock(sampling_mutex_);
 689                 changed = capture_state_ != state;
 690                 capture_state_ = state;
 691         }
 692
 693         if (changed)
 694                 capture_state_changed(state);
 695 }
 696
 697 void Session::update_signals()
 698 {
 699         if (!device_) {
 700                 signalbases_.clear();
 701                 logic_data_.reset();
 702                 for (std::shared_ptr<views::ViewBase> view : views_) {
 703                         view->clear_signals();
 704 #ifdef ENABLE_DECODE
 705                         view->clear_decode_signals();
 706 #endif
 707                 }
 708                 return;
 709         }
 710
 711         lock_guard<recursive_mutex> lock(data_mutex_);
 712
 713         const shared_ptr<sigrok::Device> sr_dev = device_->device();
 714         if (!sr_dev) {
 715                 signalbases_.clear();
 716                 logic_data_.reset();
 717                 for (std::shared_ptr<views::ViewBase> view : views_) {
 718                         view->clear_signals();
 719 #ifdef ENABLE_DECODE
 720                         view->clear_decode_signals();
 721 #endif
 722                 }
 723                 return;
 724         }
 725
 726         // Detect what data types we will receive
 727         auto channels = sr_dev->channels();
 728         unsigned int logic_channel_count = std::count_if(
 729                 channels.begin(), channels.end(),
 730                 [] (shared_ptr<Channel> channel) {
 731                         return channel->type() == ChannelType::LOGIC; });
 732
 733         // Create data containers for the logic data segments
 734         {
 735                 lock_guard<recursive_mutex> data_lock(data_mutex_);
 736
 737                 if (logic_channel_count == 0) {
 738                         logic_data_.reset();
 739                 } else if (!logic_data_ ||
 740                         logic_data_->num_channels() != logic_channel_count) {
 741                         logic_data_.reset(new data::Logic(
 742                                 logic_channel_count));
 743                         assert(logic_data_);
 744                 }
 745         }
 746
 747         // Make the signals list
 748         for (std::shared_ptr<views::ViewBase> viewbase : views_) {
 749                 views::TraceView::View *trace_view =
 750                         qobject_cast<views::TraceView::View*>(viewbase.get());
 751
 752                 if (trace_view) {
 753                         unordered_set< shared_ptr<views::TraceView::Signal> >
 754                                 prev_sigs(trace_view->signals());
 755                         trace_view->clear_signals();
 756
 757                         for (auto channel : sr_dev->channels()) {
 758                                 shared_ptr<data::SignalBase> signalbase;
 759                                 shared_ptr<views::TraceView::Signal> signal;
 760
 761                                 // Find the channel in the old signals
 762                                 const auto iter = std::find_if(
 763                                         prev_sigs.cbegin(), prev_sigs.cend(),
 764                                         [&](const shared_ptr<views::TraceView::Signal> &s) {
 765                                                 return s->base()->channel() == channel;
 766                                         });
 767                                 if (iter != prev_sigs.end()) {
 768                                         // Copy the signal from the old set to the new
 769                                         signal = *iter;
 770                                         trace_view->add_signal(signal);
 771                                 } else {
 772                                         // Find the signalbase for this channel if possible
 773                                         signalbase.reset();
 774                                         for (const shared_ptr<data::SignalBase> b : signalbases_)
 775                                                 if (b->channel() == channel)
 776                                                         signalbase = b;
 777
 778                                         switch(channel->type()->id()) {
 779                                         case SR_CHANNEL_LOGIC:
 780                                                 if (!signalbase) {
 781                                                         signalbase = make_shared<data::SignalBase>(channel);
 782                                                         signalbases_.insert(signalbase);
 783
 784                                                         all_signal_data_.insert(logic_data_);
 785                                                         signalbase->set_data(logic_data_);
 786                                                 }
 787
 788                                                 signal = shared_ptr<views::TraceView::Signal>(
 789                                                         new views::TraceView::LogicSignal(*this,
 790                                                                 device_, signalbase));
 791                                                 trace_view->add_signal(signal);
 792                                                 break;
 793
 794                                         case SR_CHANNEL_ANALOG:
 795                                         {
 796                                                 if (!signalbase) {
 797                                                         signalbase = make_shared<data::SignalBase>(channel);
 798                                                         signalbases_.insert(signalbase);
 799
 800                                                         shared_ptr<data::Analog> data(new data::Analog());
 801                                                         all_signal_data_.insert(data);
 802                                                         signalbase->set_data(data);
 803                                                 }
 804
 805                                                 signal = shared_ptr<views::TraceView::Signal>(
 806                                                         new views::TraceView::AnalogSignal(
 807                                                                 *this, signalbase));
 808                                                 trace_view->add_signal(signal);
 809                                                 break;
 810                                         }
 811
 812                                         default:
 813                                                 assert(0);
 814                                                 break;
 815                                         }
 816                                 }
 817                         }
 818                 }
 819         }
 820
 821         signals_changed();
 822 }
 823
 824 shared_ptr<data::SignalBase> Session::signalbase_from_channel(
 825         shared_ptr<sigrok::Channel> channel) const
 826 {
 827         for (shared_ptr<data::SignalBase> sig : signalbases_) {
 828                 assert(sig);
 829                 if (sig->channel() == channel)
 830                         return sig;
 831         }
 832         return shared_ptr<data::SignalBase>();
 833 }
 834
 835 void Session::sample_thread_proc(function<void (const QString)> error_handler)
 836 {
 837         assert(error_handler);
 838
 839         if (!device_)
 840                 return;
 841
 842         cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
 843
 844         out_of_memory_ = false;
 845
 846         try {
 847                 device_->start();
 848         } catch (Error e) {
 849                 error_handler(e.what());
 850                 return;
 851         }
 852
 853         set_capture_state(device_->session()->trigger() ?
 854                 AwaitingTrigger : Running);
 855
 856         device_->run();
 857         set_capture_state(Stopped);
 858
 859         // Confirm that SR_DF_END was received
 860         if (cur_logic_segment_) {
 861                 qDebug("SR_DF_END was not received.");
 862                 assert(0);
 863         }
 864
 865         // Optimize memory usage
 866         free_unused_memory();
 867
 868         // We now have unsaved data unless we just "captured" from a file
 869         shared_ptr<devices::File> file_device =
 870                 dynamic_pointer_cast<devices::File>(device_);
 871
 872         if (!file_device)
 873                 data_saved_ = false;
 874
 875         if (out_of_memory_)
 876                 error_handler(tr("Out of memory, acquisition stopped."));
 877 }
 878
 879 void Session::free_unused_memory()
 880 {
 881         for (shared_ptr<data::SignalData> data : all_signal_data_) {
 882                 const vector< shared_ptr<data::Segment> > segments = data->segments();
 883
 884                 for (shared_ptr<data::Segment> segment : segments) {
 885                         segment->free_unused_memory();
 886                 }
 887         }
 888 }
 889
 890 void Session::feed_in_header()
 891 {
 892         cur_samplerate_ = device_->read_config<uint64_t>(ConfigKey::SAMPLERATE);
 893 }
 894
 895 void Session::feed_in_meta(shared_ptr<Meta> meta)
 896 {
 897         for (auto entry : meta->config()) {
 898                 switch (entry.first->id()) {
 899                 case SR_CONF_SAMPLERATE:
 900                         // We can't rely on the header to always contain the sample rate,
 901                         // so in case it's supplied via a meta packet, we use it.
 902                         if (!cur_samplerate_)
 903                                 cur_samplerate_ = g_variant_get_uint64(entry.second.gobj());
 904
 905                         /// @todo handle samplerate changes
 906                         break;
 907                 default:
 908                         // Unknown metadata is not an error.
 909                         break;
 910                 }
 911         }
 912
 913         signals_changed();
 914 }
 915
 916 void Session::feed_in_trigger()
 917 {
 918         // The channel containing most samples should be most accurate
 919         uint64_t sample_count = 0;
 920
 921         {
 922                 for (const shared_ptr<pv::data::SignalData> d : all_signal_data_) {
 923                         assert(d);
 924                         uint64_t temp_count = 0;
 925
 926                         const vector< shared_ptr<pv::data::Segment> > segments =
 927                                 d->segments();
 928                         for (const shared_ptr<pv::data::Segment> &s : segments)
 929                                 temp_count += s->get_sample_count();
 930
 931                         if (temp_count > sample_count)
 932                                 sample_count = temp_count;
 933                 }
 934         }
 935
 936         trigger_event(sample_count / get_samplerate());
 937 }
 938
 939 void Session::feed_in_frame_begin()
 940 {
 941         if (cur_logic_segment_ || !cur_analog_segments_.empty())
 942                 frame_began();
 943 }
 944
 945 void Session::feed_in_logic(shared_ptr<Logic> logic)
 946 {
 947         lock_guard<recursive_mutex> lock(data_mutex_);
 948
 949         if (!logic_data_) {
 950                 // The only reason logic_data_ would not have been created is
 951                 // if it was not possible to determine the signals when the
 952                 // device was created.
 953                 update_signals();
 954         }
 955
 956         if (!cur_logic_segment_) {
 957                 // This could be the first packet after a trigger
 958                 set_capture_state(Running);
 959
 960                 // Create a new data segment
 961                 cur_logic_segment_ = make_shared<data::LogicSegment>(
 962                         *logic_data_, logic, cur_samplerate_);
 963                 logic_data_->push_segment(cur_logic_segment_);
 964
 965                 // @todo Putting this here means that only listeners querying
 966                 // for logic will be notified. Currently the only user of
 967                 // frame_began is DecoderStack, but in future we need to signal
 968                 // this after both analog and logic sweeps have begun.
 969                 frame_began();
 970         } else {
 971                 // Append to the existing data segment
 972                 cur_logic_segment_->append_payload(logic);
 973         }
 974
 975         data_received();
 976 }
 977
 978 void Session::feed_in_analog(shared_ptr<Analog> analog)
 979 {
 980         lock_guard<recursive_mutex> lock(data_mutex_);
 981
 982         const vector<shared_ptr<Channel>> channels = analog->channels();
 983         const unsigned int channel_count = channels.size();
 984         const size_t sample_count = analog->num_samples() / channel_count;
 985         const float *data = static_cast<const float *>(analog->data_pointer());
 986         bool sweep_beginning = false;
 987
 988         if (signalbases_.empty())
 989                 update_signals();
 990
 991         for (auto channel : channels) {
 992                 shared_ptr<data::AnalogSegment> segment;
 993
 994                 // Try to get the segment of the channel
 995                 const map< shared_ptr<Channel>, shared_ptr<data::AnalogSegment> >::
 996                         iterator iter = cur_analog_segments_.find(channel);
 997                 if (iter != cur_analog_segments_.end())
 998                         segment = (*iter).second;
 999                 else {
1000                         // If no segment was found, this means we haven't
1001                         // created one yet. i.e. this is the first packet
1002                         // in the sweep containing this segment.
1003                         sweep_beginning = true;
1004
1005                         // Find the analog data associated with the channel
1006                         shared_ptr<data::SignalBase> base = signalbase_from_channel(channel);
1007                         assert(base);
1008
1009                         shared_ptr<data::Analog> data(base->analog_data());
1010                         assert(data);
1011
1012                         // Create a segment, keep it in the maps of channels
1013                         segment = make_shared<data::AnalogSegment>(
1014                                 *data, cur_samplerate_);
1015                         cur_analog_segments_[channel] = segment;
1016
1017                         // Push the segment into the analog data.
1018                         data->push_segment(segment);
1019                 }
1020
1021                 assert(segment);
1022
1023                 // Append the samples in the segment
1024                 segment->append_interleaved_samples(data++, sample_count,
1025                         channel_count);
1026         }
1027
1028         if (sweep_beginning) {
1029                 // This could be the first packet after a trigger
1030                 set_capture_state(Running);
1031         }
1032
1033         data_received();
1034 }
1035
1036 void Session::data_feed_in(shared_ptr<sigrok::Device> device,
1037         shared_ptr<Packet> packet)
1038 {
1039         static bool frame_began=false;
1040
1041         (void)device;
1042
1043         assert(device);
1044         assert(device == device_->device());
1045         assert(packet);
1046
1047         switch (packet->type()->id()) {
1048         case SR_DF_HEADER:
1049                 feed_in_header();
1050                 break;
1051
1052         case SR_DF_META:
1053                 feed_in_meta(dynamic_pointer_cast<Meta>(packet->payload()));
1054                 break;
1055
1056         case SR_DF_TRIGGER:
1057                 feed_in_trigger();
1058                 break;
1059
1060         case SR_DF_FRAME_BEGIN:
1061                 feed_in_frame_begin();
1062                 frame_began = true;
1063                 break;
1064
1065         case SR_DF_LOGIC:
1066                 try {
1067                         feed_in_logic(dynamic_pointer_cast<Logic>(packet->payload()));
1068                 } catch (std::bad_alloc) {
1069                         out_of_memory_ = true;
1070                         device_->stop();
1071                 }
1072                 break;
1073
1074         case SR_DF_ANALOG:
1075                 try {
1076                         feed_in_analog(dynamic_pointer_cast<Analog>(packet->payload()));
1077                 } catch (std::bad_alloc) {
1078                         out_of_memory_ = true;
1079                         device_->stop();
1080                 }
1081                 break;
1082
1083         case SR_DF_FRAME_END:
1084         case SR_DF_END:
1085         {
1086                 {
1087                         lock_guard<recursive_mutex> lock(data_mutex_);
1088                         cur_logic_segment_.reset();
1089                         cur_analog_segments_.clear();
1090                 }
1091                 if (frame_began) {
1092                         frame_began = false;
1093                         frame_ended();
1094                 }
1095                 break;
1096         }
1097         default:
1098                 break;
1099         }
1100 }
1101
1102 void Session::on_data_saved()
1103 {
1104         data_saved_ = true;
1105 }
1106
1107 } // namespace pv