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