pv/data/decodesignal.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2017 Soeren Apel <soeren@apelpie.net>
   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 #include <limits>
  21
  22 #include <QDebug>
  23
  24 #include "logic.hpp"
  25 #include "logicsegment.hpp"
  26 #include "decodesignal.hpp"
  27 #include "signaldata.hpp"
  28
  29 #include <pv/binding/decoder.hpp>
  30 #include <pv/data/decode/decoder.hpp>
  31 #include <pv/data/decode/row.hpp>
  32 #include <pv/globalsettings.hpp>
  33 #include <pv/session.hpp>
  34
  35 using std::lock_guard;
  36 using std::make_pair;
  37 using std::make_shared;
  38 using std::min;
  39 using std::shared_ptr;
  40 using std::unique_lock;
  41 using pv::data::decode::Annotation;
  42 using pv::data::decode::Decoder;
  43 using pv::data::decode::Row;
  44
  45 namespace pv {
  46 namespace data {
  47
  48 const double DecodeSignal::DecodeMargin = 1.0;
  49 const double DecodeSignal::DecodeThreshold = 0.2;
  50 const int64_t DecodeSignal::DecodeChunkLength = 256 * 1024;
  51
  52
  53 DecodeSignal::DecodeSignal(pv::Session &session) :
  54         SignalBase(nullptr, SignalBase::DecodeChannel),
  55         session_(session),
  56         srd_session_(nullptr),
  57         logic_mux_data_invalid_(false),
  58         start_time_(0),
  59         samplerate_(0),
  60         samples_decoded_(0),
  61         frame_complete_(false)
  62 {
  63         connect(&session_, SIGNAL(capture_state_changed(int)),
  64                 this, SLOT(on_capture_state_changed(int)));
  65
  66         set_name(tr("Empty decoder signal"));
  67 }
  68
  69 DecodeSignal::~DecodeSignal()
  70 {
  71         reset_decode();
  72 }
  73
  74 const vector< shared_ptr<Decoder> >& DecodeSignal::decoder_stack() const
  75 {
  76         return stack_;
  77 }
  78
  79 void DecodeSignal::stack_decoder(const srd_decoder *decoder)
  80 {
  81         assert(decoder);
  82         const shared_ptr<Decoder> dec = make_shared<decode::Decoder>(decoder);
  83
  84         stack_.push_back(dec);
  85
  86         // Set name if this decoder is the first in the list
  87         if (stack_.size() == 1)
  88                 set_name(QString::fromUtf8(decoder->name));
  89
  90         // Include the newly created decode channels in the channel lists
  91         update_channel_list();
  92
  93         auto_assign_signals(dec);
  94         commit_decoder_channels();
  95         begin_decode();
  96 }
  97
  98 void DecodeSignal::remove_decoder(int index)
  99 {
 100         assert(index >= 0);
 101         assert(index < (int)stack_.size());
 102
 103         // Find the decoder in the stack
 104         auto iter = stack_.begin();
 105         for (int i = 0; i < index; i++, iter++)
 106                 assert(iter != stack_.end());
 107
 108         // Delete the element
 109         stack_.erase(iter);
 110
 111         // Update channels and decoded data
 112         update_channel_list();
 113         begin_decode();
 114 }
 115
 116 bool DecodeSignal::toggle_decoder_visibility(int index)
 117 {
 118         auto iter = stack_.cbegin();
 119         for (int i = 0; i < index; i++, iter++)
 120                 assert(iter != stack_.end());
 121
 122         shared_ptr<Decoder> dec = *iter;
 123
 124         // Toggle decoder visibility
 125         bool state = false;
 126         if (dec) {
 127                 state = !dec->shown();
 128                 dec->show(state);
 129         }
 130
 131         return state;
 132 }
 133
 134 void DecodeSignal::reset_decode()
 135 {
 136         if (decode_thread_.joinable()) {
 137                 decode_interrupt_ = true;
 138                 decode_input_cond_.notify_one();
 139                 decode_thread_.join();
 140         }
 141
 142         if (logic_mux_thread_.joinable()) {
 143                 logic_mux_interrupt_ = true;
 144                 logic_mux_cond_.notify_one();
 145                 logic_mux_thread_.join();
 146         }
 147
 148         stop_srd_session();
 149
 150         frame_complete_ = false;
 151         samples_decoded_ = 0;
 152         error_message_ = QString();
 153
 154         rows_.clear();
 155         class_rows_.clear();
 156
 157         logic_mux_data_.reset();
 158         logic_mux_data_invalid_ = true;
 159 }
 160
 161 void DecodeSignal::begin_decode()
 162 {
 163         if (decode_thread_.joinable()) {
 164                 decode_interrupt_ = true;
 165                 decode_input_cond_.notify_one();
 166                 decode_thread_.join();
 167         }
 168
 169         if (logic_mux_thread_.joinable()) {
 170                 logic_mux_interrupt_ = true;
 171                 logic_mux_cond_.notify_one();
 172                 logic_mux_thread_.join();
 173         }
 174
 175         reset_decode();
 176
 177         if (stack_.size() == 0) {
 178                 error_message_ = tr("No decoders");
 179                 return;
 180         }
 181
 182         assert(channels_.size() > 0);
 183
 184         if (get_assigned_signal_count() == 0) {
 185                 error_message_ = tr("There are no channels assigned to this decoder");
 186                 return;
 187         }
 188
 189         // Make sure that all assigned channels still provide logic data
 190         // (can happen when a converted signal was assigned but the
 191         // conversion removed in the meanwhile)
 192         for (data::DecodeChannel &ch : channels_)
 193                 if (ch.assigned_signal && !(ch.assigned_signal->logic_data() != nullptr))
 194                         ch.assigned_signal = nullptr;
 195
 196         // Check that all decoders have the required channels
 197         for (const shared_ptr<decode::Decoder> &dec : stack_)
 198                 if (!dec->have_required_channels()) {
 199                         error_message_ = tr("One or more required channels "
 200                                 "have not been specified");
 201                         return;
 202                 }
 203
 204         // Add annotation classes
 205         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 206                 assert(dec);
 207                 const srd_decoder *const decc = dec->decoder();
 208                 assert(dec->decoder());
 209
 210                 // Add a row for the decoder if it doesn't have a row list
 211                 if (!decc->annotation_rows)
 212                         rows_[Row(decc)] = decode::RowData();
 213
 214                 // Add the decoder rows
 215                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 216                         const srd_decoder_annotation_row *const ann_row =
 217                                 (srd_decoder_annotation_row *)l->data;
 218                         assert(ann_row);
 219
 220                         const Row row(decc, ann_row);
 221
 222                         // Add a new empty row data object
 223                         rows_[row] = decode::RowData();
 224
 225                         // Map out all the classes
 226                         for (const GSList *ll = ann_row->ann_classes;
 227                                 ll; ll = ll->next)
 228                                 class_rows_[make_pair(decc,
 229                                         GPOINTER_TO_INT(ll->data))] = row;
 230                 }
 231         }
 232
 233         // Free the logic data and its segment(s) if it needs to be updated
 234         if (logic_mux_data_invalid_)
 235                 logic_mux_data_.reset();
 236
 237         if (!logic_mux_data_) {
 238                 const int64_t ch_count = get_assigned_signal_count();
 239                 const int64_t unit_size = (ch_count + 7) / 8;
 240                 logic_mux_data_ = make_shared<Logic>(ch_count);
 241                 segment_ = make_shared<LogicSegment>(*logic_mux_data_, unit_size, samplerate_);
 242                 logic_mux_data_->push_segment(segment_);
 243         }
 244
 245         // Make sure the logic output data is complete and up-to-date
 246         logic_mux_interrupt_ = false;
 247         logic_mux_thread_ = std::thread(&DecodeSignal::logic_mux_proc, this);
 248
 249         // Decode the muxed logic data
 250         decode_interrupt_ = false;
 251         decode_thread_ = std::thread(&DecodeSignal::decode_proc, this);
 252
 253         // Receive notifications when new sample data is available
 254         connect_input_notifiers();
 255 }
 256
 257 QString DecodeSignal::error_message() const
 258 {
 259         lock_guard<mutex> lock(output_mutex_);
 260         return error_message_;
 261 }
 262
 263 const vector<data::DecodeChannel> DecodeSignal::get_channels() const
 264 {
 265         return channels_;
 266 }
 267
 268 void DecodeSignal::auto_assign_signals(const shared_ptr<Decoder> dec)
 269 {
 270         bool new_assignment = false;
 271
 272         // Try to auto-select channels that don't have signals assigned yet
 273         for (data::DecodeChannel &ch : channels_) {
 274                 // If a decoder is given, auto-assign only its channels
 275                 if (dec && (ch.decoder_ != dec))
 276                         continue;
 277
 278                 if (ch.assigned_signal)
 279                         continue;
 280
 281                 for (shared_ptr<data::SignalBase> s : session_.signalbases()) {
 282                         const QString ch_name = ch.name.toLower();
 283                         const QString s_name = s->name().toLower();
 284
 285                         if (s->logic_data() &&
 286                                 ((ch_name.contains(s_name)) || (s_name.contains(ch_name)))) {
 287                                 ch.assigned_signal = s.get();
 288                                 new_assignment = true;
 289                         }
 290                 }
 291         }
 292
 293         if (new_assignment) {
 294                 logic_mux_data_invalid_ = true;
 295                 commit_decoder_channels();
 296                 channels_updated();
 297         }
 298 }
 299
 300 void DecodeSignal::assign_signal(const uint16_t channel_id, const SignalBase *signal)
 301 {
 302         for (data::DecodeChannel &ch : channels_)
 303                 if (ch.id == channel_id) {
 304                         ch.assigned_signal = signal;
 305                         logic_mux_data_invalid_ = true;
 306                 }
 307
 308         commit_decoder_channels();
 309         channels_updated();
 310         begin_decode();
 311 }
 312
 313 int DecodeSignal::get_assigned_signal_count() const
 314 {
 315         // Count all channels that have a signal assigned to them
 316         return count_if(channels_.begin(), channels_.end(),
 317                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 318 }
 319
 320 void DecodeSignal::set_initial_pin_state(const uint16_t channel_id, const int init_state)
 321 {
 322         for (data::DecodeChannel &ch : channels_)
 323                 if (ch.id == channel_id)
 324                         ch.initial_pin_state = init_state;
 325
 326         channels_updated();
 327
 328         begin_decode();
 329 }
 330
 331 double DecodeSignal::samplerate() const
 332 {
 333         return samplerate_;
 334 }
 335
 336 const pv::util::Timestamp& DecodeSignal::start_time() const
 337 {
 338         return start_time_;
 339 }
 340
 341 int64_t DecodeSignal::get_working_sample_count() const
 342 {
 343         // The working sample count is the highest sample number for
 344         // which all used signals have data available, so go through
 345         // all channels and use the lowest overall sample count of the
 346         // current segment
 347
 348         // TODO Currently, we assume only a single segment exists
 349
 350         int64_t count = std::numeric_limits<int64_t>::max();
 351         bool no_signals_assigned = true;
 352
 353         for (const data::DecodeChannel &ch : channels_)
 354                 if (ch.assigned_signal) {
 355                         no_signals_assigned = false;
 356
 357                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 358                         if (!logic_data || logic_data->logic_segments().empty())
 359                                 return 0;
 360
 361                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 362                         count = min(count, (int64_t)segment->get_sample_count());
 363                 }
 364
 365         return (no_signals_assigned ? 0 : count);
 366 }
 367
 368 int64_t DecodeSignal::get_decoded_sample_count() const
 369 {
 370         lock_guard<mutex> decode_lock(output_mutex_);
 371         return samples_decoded_;
 372 }
 373
 374 vector<Row> DecodeSignal::visible_rows() const
 375 {
 376         lock_guard<mutex> lock(output_mutex_);
 377
 378         vector<Row> rows;
 379
 380         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 381                 assert(dec);
 382                 if (!dec->shown())
 383                         continue;
 384
 385                 const srd_decoder *const decc = dec->decoder();
 386                 assert(dec->decoder());
 387
 388                 // Add a row for the decoder if it doesn't have a row list
 389                 if (!decc->annotation_rows)
 390                         rows.emplace_back(decc);
 391
 392                 // Add the decoder rows
 393                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 394                         const srd_decoder_annotation_row *const ann_row =
 395                                 (srd_decoder_annotation_row *)l->data;
 396                         assert(ann_row);
 397                         rows.emplace_back(decc, ann_row);
 398                 }
 399         }
 400
 401         return rows;
 402 }
 403
 404 void DecodeSignal::get_annotation_subset(
 405         vector<pv::data::decode::Annotation> &dest,
 406         const decode::Row &row, uint64_t start_sample,
 407         uint64_t end_sample) const
 408 {
 409         lock_guard<mutex> lock(output_mutex_);
 410
 411         const auto iter = rows_.find(row);
 412         if (iter != rows_.end())
 413                 (*iter).second.get_annotation_subset(dest,
 414                         start_sample, end_sample);
 415 }
 416
 417 void DecodeSignal::save_settings(QSettings &settings) const
 418 {
 419         SignalBase::save_settings(settings);
 420
 421         settings.setValue("decoders", (int)(stack_.size()));
 422
 423         // Save decoder stack
 424         int decoder_idx = 0;
 425         for (shared_ptr<decode::Decoder> decoder : stack_) {
 426                 settings.beginGroup("decoder" + QString::number(decoder_idx++));
 427
 428                 settings.setValue("id", decoder->decoder()->id);
 429
 430                 // Save decoder options
 431                 const map<string, GVariant*>& options = decoder->options();
 432
 433                 settings.setValue("options", (int)options.size());
 434
 435                 // Note: decode::Decoder::options() returns only the options
 436                 // that differ from the default. See binding::Decoder::getter()
 437                 int i = 0;
 438                 for (auto option : options) {
 439                         settings.beginGroup("option" + QString::number(i));
 440                         settings.setValue("name", QString::fromStdString(option.first));
 441                         GlobalSettings::store_gvariant(settings, option.second);
 442                         settings.endGroup();
 443                         i++;
 444                 }
 445
 446                 settings.endGroup();
 447         }
 448
 449         // Save channel mapping
 450         settings.setValue("channels", (int)channels_.size());
 451
 452         for (unsigned int channel_id = 0; channel_id < channels_.size(); channel_id++) {
 453                 auto channel = find_if(channels_.begin(), channels_.end(),
 454                         [&](data::DecodeChannel ch) { return ch.id == channel_id; });
 455
 456                 if (channel == channels_.end()) {
 457                         qDebug() << "ERROR: Gap in channel index:" << channel_id;
 458                         continue;
 459                 }
 460
 461                 settings.beginGroup("channel" + QString::number(channel_id));
 462
 463                 settings.setValue("name", channel->name);  // Useful for debugging
 464                 settings.setValue("initial_pin_state", channel->initial_pin_state);
 465
 466                 if (channel->assigned_signal)
 467                         settings.setValue("assigned_signal_name", channel->assigned_signal->name());
 468
 469                 settings.endGroup();
 470         }
 471 }
 472
 473 void DecodeSignal::restore_settings(QSettings &settings)
 474 {
 475         SignalBase::restore_settings(settings);
 476
 477         // Restore decoder stack
 478         GSList *dec_list = g_slist_copy((GSList*)srd_decoder_list());
 479
 480         int decoders = settings.value("decoders").toInt();
 481
 482         for (int decoder_idx = 0; decoder_idx < decoders; decoder_idx++) {
 483                 settings.beginGroup("decoder" + QString::number(decoder_idx));
 484
 485                 QString id = settings.value("id").toString();
 486
 487                 for (GSList *entry = dec_list; entry; entry = entry->next) {
 488                         const srd_decoder *dec = (srd_decoder*)entry->data;
 489                         if (!dec)
 490                                 continue;
 491
 492                         if (QString::fromUtf8(dec->id) == id) {
 493                                 shared_ptr<decode::Decoder> decoder =
 494                                         make_shared<decode::Decoder>(dec);
 495
 496                                 stack_.push_back(decoder);
 497
 498                                 // Restore decoder options that differ from their default
 499                                 int options = settings.value("options").toInt();
 500
 501                                 for (int i = 0; i < options; i++) {
 502                                         settings.beginGroup("option" + QString::number(i));
 503                                         QString name = settings.value("name").toString();
 504                                         GVariant *value = GlobalSettings::restore_gvariant(settings);
 505                                         decoder->set_option(name.toUtf8(), value);
 506                                         settings.endGroup();
 507                                 }
 508
 509                                 // Include the newly created decode channels in the channel lists
 510                                 update_channel_list();
 511                                 commit_decoder_channels();
 512                                 break;
 513                         }
 514                 }
 515
 516                 settings.endGroup();
 517                 channels_updated();
 518         }
 519
 520         // Restore channel mapping
 521         unsigned int channels = settings.value("channels").toInt();
 522
 523         const unordered_set< shared_ptr<data::SignalBase> > signalbases =
 524                 session_.signalbases();
 525
 526         for (unsigned int channel_id = 0; channel_id < channels; channel_id++) {
 527                 auto channel = find_if(channels_.begin(), channels_.end(),
 528                         [&](data::DecodeChannel ch) { return ch.id == channel_id; });
 529
 530                 if (channel == channels_.end()) {
 531                         qDebug() << "ERROR: Non-existant channel index:" << channel_id;
 532                         continue;
 533                 }
 534
 535                 settings.beginGroup("channel" + QString::number(channel_id));
 536
 537                 QString assigned_signal_name = settings.value("assigned_signal_name").toString();
 538
 539                 for (shared_ptr<data::SignalBase> signal : signalbases)
 540                         if (signal->name() == assigned_signal_name)
 541                                 channel->assigned_signal = signal.get();
 542
 543                 channel->initial_pin_state = settings.value("initial_pin_state").toInt();
 544
 545                 settings.endGroup();
 546         }
 547
 548         begin_decode();
 549 }
 550
 551 void DecodeSignal::update_channel_list()
 552 {
 553         vector<data::DecodeChannel> prev_channels = channels_;
 554         channels_.clear();
 555
 556         uint16_t id = 0;
 557
 558         // Copy existing entries, create new as needed
 559         for (shared_ptr<Decoder> decoder : stack_) {
 560                 const srd_decoder* srd_d = decoder->decoder();
 561                 const GSList *l;
 562
 563                 // Mandatory channels
 564                 for (l = srd_d->channels; l; l = l->next) {
 565                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 566                         bool ch_added = false;
 567
 568                         // Copy but update ID if this channel was in the list before
 569                         for (data::DecodeChannel &ch : prev_channels)
 570                                 if (ch.pdch_ == pdch) {
 571                                         ch.id = id++;
 572                                         channels_.push_back(ch);
 573                                         ch_added = true;
 574                                         break;
 575                                 }
 576
 577                         if (!ch_added) {
 578                                 // Create new entry without a mapped signal
 579                                 data::DecodeChannel ch = {id++, false, nullptr,
 580                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 581                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 582                                 channels_.push_back(ch);
 583                         }
 584                 }
 585
 586                 // Optional channels
 587                 for (l = srd_d->opt_channels; l; l = l->next) {
 588                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 589                         bool ch_added = false;
 590
 591                         // Copy but update ID if this channel was in the list before
 592                         for (data::DecodeChannel &ch : prev_channels)
 593                                 if (ch.pdch_ == pdch) {
 594                                         ch.id = id++;
 595                                         channels_.push_back(ch);
 596                                         ch_added = true;
 597                                         break;
 598                                 }
 599
 600                         if (!ch_added) {
 601                                 // Create new entry without a mapped signal
 602                                 data::DecodeChannel ch = {id++, true, nullptr,
 603                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 604                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 605                                 channels_.push_back(ch);
 606                         }
 607                 }
 608         }
 609
 610         // Invalidate the logic output data if the channel assignment changed
 611         if (prev_channels.size() != channels_.size()) {
 612                 // The number of channels changed, there's definitely a difference
 613                 logic_mux_data_invalid_ = true;
 614         } else {
 615                 // Same number but assignment may still differ, so compare all channels
 616                 for (size_t i = 0; i < channels_.size(); i++) {
 617                         const data::DecodeChannel &p_ch = prev_channels[i];
 618                         const data::DecodeChannel &ch = channels_[i];
 619
 620                         if ((p_ch.pdch_ != ch.pdch_) ||
 621                                 (p_ch.assigned_signal != ch.assigned_signal)) {
 622                                 logic_mux_data_invalid_ = true;
 623                                 break;
 624                         }
 625                 }
 626
 627         }
 628
 629         channels_updated();
 630 }
 631
 632 void DecodeSignal::commit_decoder_channels()
 633 {
 634         // Submit channel list to every decoder, containing only the relevant channels
 635         for (shared_ptr<decode::Decoder> dec : stack_) {
 636                 vector<data::DecodeChannel*> channel_list;
 637
 638                 for (data::DecodeChannel &ch : channels_)
 639                         if (ch.decoder_ == dec)
 640                                 channel_list.push_back(&ch);
 641
 642                 dec->set_channels(channel_list);
 643         }
 644 }
 645
 646 void DecodeSignal::mux_logic_samples(const int64_t start, const int64_t end)
 647 {
 648         // Enforce end to be greater than start
 649         if (end <= start)
 650                 return;
 651
 652         // Fetch all segments and their data
 653         // TODO Currently, we assume only a single segment exists
 654         vector<shared_ptr<LogicSegment> > segments;
 655         vector<const uint8_t*> signal_data;
 656         vector<uint8_t> signal_in_bytepos;
 657         vector<uint8_t> signal_in_bitpos;
 658
 659         for (data::DecodeChannel &ch : channels_)
 660                 if (ch.assigned_signal) {
 661                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 662                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 663                         segments.push_back(segment);
 664
 665                         uint8_t* data = new uint8_t[(end - start) * segment->unit_size()];
 666                         segment->get_samples(start, end, data);
 667                         signal_data.push_back(data);
 668
 669                         const int bitpos = ch.assigned_signal->logic_bit_index();
 670                         signal_in_bytepos.push_back(bitpos / 8);
 671                         signal_in_bitpos.push_back(bitpos % 8);
 672                 }
 673
 674         // Perform the muxing of signal data into the output data
 675         uint8_t* output = new uint8_t[(end - start) * segment_->unit_size()];
 676         unsigned int signal_count = signal_data.size();
 677
 678         for (int64_t sample_cnt = 0; sample_cnt < (end - start); sample_cnt++) {
 679                 int bitpos = 0;
 680                 uint8_t bytepos = 0;
 681
 682                 const int out_sample_pos = sample_cnt * segment_->unit_size();
 683                 for (unsigned int i = 0; i < segment_->unit_size(); i++)
 684                         output[out_sample_pos + i] = 0;
 685
 686                 for (unsigned int i = 0; i < signal_count; i++) {
 687                         const int in_sample_pos = sample_cnt * segments[i]->unit_size();
 688                         const uint8_t in_sample = 1 &
 689                                 ((signal_data[i][in_sample_pos + signal_in_bytepos[i]]) >> (signal_in_bitpos[i]));
 690
 691                         const uint8_t out_sample = output[out_sample_pos + bytepos];
 692
 693                         output[out_sample_pos + bytepos] = out_sample | (in_sample << bitpos);
 694
 695                         bitpos++;
 696                         if (bitpos > 7) {
 697                                 bitpos = 0;
 698                                 bytepos++;
 699                         }
 700                 }
 701         }
 702
 703         segment_->append_payload(output, (end - start) * segment_->unit_size());
 704         delete[] output;
 705
 706         for (const uint8_t* data : signal_data)
 707                 delete[] data;
 708 }
 709
 710 void DecodeSignal::logic_mux_proc()
 711 {
 712         do {
 713                 const uint64_t input_sample_count = get_working_sample_count();
 714                 const uint64_t output_sample_count = segment_->get_sample_count();
 715
 716                 const uint64_t samples_to_process =
 717                         (input_sample_count > output_sample_count) ?
 718                         (input_sample_count - output_sample_count) : 0;
 719
 720                 // Process the samples if necessary...
 721                 if (samples_to_process > 0) {
 722                         const uint64_t unit_size = segment_->unit_size();
 723                         const uint64_t chunk_sample_count = DecodeChunkLength / unit_size;
 724
 725                         uint64_t processed_samples = 0;
 726                         do {
 727                                 const uint64_t start_sample = output_sample_count + processed_samples;
 728                                 const uint64_t sample_count =
 729                                         min(samples_to_process - processed_samples,     chunk_sample_count);
 730
 731                                 mux_logic_samples(start_sample, start_sample + sample_count);
 732                                 processed_samples += sample_count;
 733
 734                                 // ...and process the newly muxed logic data
 735                                 decode_input_cond_.notify_one();
 736                         } while (processed_samples < samples_to_process);
 737                 }
 738
 739                 if (samples_to_process == 0) {
 740                         // Wait for more input
 741                         unique_lock<mutex> logic_mux_lock(logic_mux_mutex_);
 742                         logic_mux_cond_.wait(logic_mux_lock);
 743                 }
 744         } while (!logic_mux_interrupt_);
 745
 746         // No more input data and session is stopped, let the decode thread
 747         // process any pending data, terminate and release the global SRD mutex
 748         // in order to let other decoders run
 749         decode_input_cond_.notify_one();
 750 }
 751
 752 void DecodeSignal::query_input_metadata()
 753 {
 754         // Update the samplerate and start time because we cannot start
 755         // the libsrd session without the current samplerate
 756
 757         // TODO Currently we assume all channels have the same sample rate
 758         // and start time
 759         bool samplerate_valid = false;
 760         data::DecodeChannel *any_channel;
 761         shared_ptr<Logic> logic_data;
 762
 763         do {
 764                 any_channel = &(*find_if(channels_.begin(), channels_.end(),
 765                         [](data::DecodeChannel ch) { return ch.assigned_signal; }));
 766
 767                 logic_data = any_channel->assigned_signal->logic_data();
 768
 769                 if (!logic_data) {
 770                         // Wait until input data is available or an interrupt was requested
 771                         unique_lock<mutex> input_wait_lock(input_mutex_);
 772                         decode_input_cond_.wait(input_wait_lock);
 773                 }
 774         } while (!logic_data && !decode_interrupt_);
 775
 776         if (decode_interrupt_)
 777                 return;
 778
 779         do {
 780                 if (!logic_data->logic_segments().empty()) {
 781                         shared_ptr<LogicSegment> first_segment =
 782                                 any_channel->assigned_signal->logic_data()->logic_segments().front();
 783                         start_time_ = first_segment->start_time();
 784                         samplerate_ = first_segment->samplerate();
 785                         if (samplerate_ > 0)
 786                                 samplerate_valid = true;
 787                 }
 788
 789                 if (!samplerate_valid) {
 790                         // Wait until input data is available or an interrupt was requested
 791                         unique_lock<mutex> input_wait_lock(input_mutex_);
 792                         decode_input_cond_.wait(input_wait_lock);
 793                 }
 794         } while (!samplerate_valid && !decode_interrupt_);
 795 }
 796
 797 void DecodeSignal::decode_data(
 798         const int64_t abs_start_samplenum, const int64_t sample_count)
 799 {
 800         const int64_t unit_size = segment_->unit_size();
 801         const int64_t chunk_sample_count = DecodeChunkLength / unit_size;
 802
 803         for (int64_t i = abs_start_samplenum;
 804                 !decode_interrupt_ && (i < (abs_start_samplenum + sample_count));
 805                 i += chunk_sample_count) {
 806
 807                 const int64_t chunk_end = min(i + chunk_sample_count,
 808                         abs_start_samplenum + sample_count);
 809
 810                 int64_t data_size = (chunk_end - i) * unit_size;
 811                 uint8_t* chunk = new uint8_t[data_size];
 812                 segment_->get_samples(i, chunk_end, chunk);
 813
 814                 if (srd_session_send(srd_session_, i, chunk_end, chunk,
 815                                 data_size, unit_size) != SRD_OK) {
 816                         error_message_ = tr("Decoder reported an error");
 817                         delete[] chunk;
 818                         break;
 819                 }
 820
 821                 delete[] chunk;
 822
 823                 {
 824                         lock_guard<mutex> lock(output_mutex_);
 825                         samples_decoded_ = chunk_end;
 826                 }
 827
 828                 // Notify the frontend that we processed some data and
 829                 // possibly have new annotations as well
 830                 new_annotations();
 831         }
 832 }
 833
 834 void DecodeSignal::decode_proc()
 835 {
 836         query_input_metadata();
 837
 838         if (decode_interrupt_)
 839                 return;
 840
 841         start_srd_session();
 842
 843         uint64_t sample_count;
 844         uint64_t abs_start_samplenum = 0;
 845         do {
 846                 // Keep processing new samples until we exhaust the input data
 847                 do {
 848                         lock_guard<mutex> input_lock(input_mutex_);
 849                         sample_count = segment_->get_sample_count() - abs_start_samplenum;
 850
 851                         if (sample_count > 0) {
 852                                 decode_data(abs_start_samplenum, sample_count);
 853                                 abs_start_samplenum += sample_count;
 854                         }
 855                 } while (error_message_.isEmpty() && (sample_count > 0) && !decode_interrupt_);
 856
 857                 if (error_message_.isEmpty() && !decode_interrupt_) {
 858                         if (sample_count == 0)
 859                                 decode_finished();
 860
 861                         // Wait for new input data or an interrupt was requested
 862                         unique_lock<mutex> input_wait_lock(input_mutex_);
 863                         decode_input_cond_.wait(input_wait_lock);
 864                 }
 865         } while (error_message_.isEmpty() && !decode_interrupt_);
 866 }
 867
 868 void DecodeSignal::start_srd_session()
 869 {
 870         if (srd_session_)
 871                 stop_srd_session();
 872
 873         // Create the session
 874         srd_session_new(&srd_session_);
 875         assert(srd_session_);
 876
 877         // Create the decoders
 878         srd_decoder_inst *prev_di = nullptr;
 879         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 880                 srd_decoder_inst *const di = dec->create_decoder_inst(srd_session_);
 881
 882                 if (!di) {
 883                         error_message_ = tr("Failed to create decoder instance");
 884                         srd_session_destroy(srd_session_);
 885                         return;
 886                 }
 887
 888                 if (prev_di)
 889                         srd_inst_stack(srd_session_, prev_di, di);
 890
 891                 prev_di = di;
 892         }
 893
 894         // Start the session
 895         srd_session_metadata_set(srd_session_, SRD_CONF_SAMPLERATE,
 896                 g_variant_new_uint64(samplerate_));
 897
 898         srd_pd_output_callback_add(srd_session_, SRD_OUTPUT_ANN,
 899                 DecodeSignal::annotation_callback, this);
 900
 901         srd_session_start(srd_session_);
 902 }
 903
 904 void DecodeSignal::stop_srd_session()
 905 {
 906         if (srd_session_) {
 907                 // Destroy the session
 908                 srd_session_destroy(srd_session_);
 909                 srd_session_ = nullptr;
 910         }
 911 }
 912
 913 void DecodeSignal::connect_input_notifiers()
 914 {
 915         // Disconnect the notification slot from the previous set of signals
 916         disconnect(this, SLOT(on_data_cleared()));
 917         disconnect(this, SLOT(on_data_received()));
 918
 919         // Connect the currently used signals to our slot
 920         for (data::DecodeChannel &ch : channels_) {
 921                 if (!ch.assigned_signal)
 922                         continue;
 923
 924                 const data::SignalBase *signal = ch.assigned_signal;
 925                 connect(signal, SIGNAL(samples_cleared()),
 926                         this, SLOT(on_data_cleared()));
 927                 connect(signal, SIGNAL(samples_added(QObject*, uint64_t, uint64_t)),
 928                         this, SLOT(on_data_received()));
 929         }
 930 }
 931
 932 void DecodeSignal::annotation_callback(srd_proto_data *pdata, void *decode_signal)
 933 {
 934         assert(pdata);
 935         assert(decode_signal);
 936
 937         DecodeSignal *const ds = (DecodeSignal*)decode_signal;
 938         assert(ds);
 939
 940         lock_guard<mutex> lock(ds->output_mutex_);
 941
 942         const decode::Annotation a(pdata);
 943
 944         // Find the row
 945         assert(pdata->pdo);
 946         assert(pdata->pdo->di);
 947         const srd_decoder *const decc = pdata->pdo->di->decoder;
 948         assert(decc);
 949
 950         auto row_iter = ds->rows_.end();
 951
 952         // Try looking up the sub-row of this class
 953         const auto r = ds->class_rows_.find(make_pair(decc, a.format()));
 954         if (r != ds->class_rows_.end())
 955                 row_iter = ds->rows_.find((*r).second);
 956         else {
 957                 // Failing that, use the decoder as a key
 958                 row_iter = ds->rows_.find(Row(decc));
 959         }
 960
 961         assert(row_iter != ds->rows_.end());
 962         if (row_iter == ds->rows_.end()) {
 963                 qDebug() << "Unexpected annotation: decoder = " << decc <<
 964                         ", format = " << a.format();
 965                 assert(false);
 966                 return;
 967         }
 968
 969         // Add the annotation
 970         (*row_iter).second.push_annotation(a);
 971 }
 972
 973 void DecodeSignal::on_capture_state_changed(int state)
 974 {
 975         // If a new acquisition was started, we need to start decoding from scratch
 976         if (state == Session::Running)
 977                 begin_decode();
 978 }
 979
 980 void DecodeSignal::on_data_cleared()
 981 {
 982         reset_decode();
 983 }
 984
 985 void DecodeSignal::on_data_received()
 986 {
 987         if (!logic_mux_thread_.joinable())
 988                 begin_decode();
 989         else
 990                 logic_mux_cond_.notify_one();
 991 }
 992
 993 } // namespace data
 994 } // namespace pv