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