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 = 10 * 1024 * 1024;
  50 const unsigned int DecodeSignal::DecodeNotifyPeriod = 1024;
  51
  52 mutex DecodeSignal::global_srd_mutex_;
  53
  54
  55 DecodeSignal::DecodeSignal(pv::Session &session) :
  56         SignalBase(nullptr, SignalBase::DecodeChannel),
  57         session_(session),
  58         srd_session_(nullptr),
  59         logic_mux_data_invalid_(false),
  60         start_time_(0),
  61         samplerate_(0),
  62         annotation_count_(0),
  63         samples_decoded_(0),
  64         frame_complete_(false)
  65 {
  66         connect(&session_, SIGNAL(capture_state_changed(int)),
  67                 this, SLOT(on_capture_state_changed(int)));
  68
  69         set_name(tr("Empty decoder signal"));
  70 }
  71
  72 DecodeSignal::~DecodeSignal()
  73 {
  74         if (decode_thread_.joinable()) {
  75                 decode_interrupt_ = true;
  76                 decode_input_cond_.notify_one();
  77                 decode_thread_.join();
  78         }
  79
  80         if (logic_mux_thread_.joinable()) {
  81                 logic_mux_interrupt_ = true;
  82                 logic_mux_cond_.notify_one();
  83                 logic_mux_thread_.join();
  84         }
  85
  86         stop_srd_session();
  87 }
  88
  89 const vector< shared_ptr<Decoder> >& DecodeSignal::decoder_stack() const
  90 {
  91         return stack_;
  92 }
  93
  94 void DecodeSignal::stack_decoder(srd_decoder *decoder)
  95 {
  96         assert(decoder);
  97         stack_.push_back(make_shared<decode::Decoder>(decoder));
  98
  99         // Set name if this decoder is the first in the list
 100         if (stack_.size() == 1)
 101                 set_name(QString::fromUtf8(decoder->name));
 102
 103         // Include the newly created decode channels in the channel lists
 104         update_channel_list();
 105
 106         auto_assign_signals();
 107         commit_decoder_channels();
 108         begin_decode();
 109 }
 110
 111 void DecodeSignal::remove_decoder(int index)
 112 {
 113         assert(index >= 0);
 114         assert(index < (int)stack_.size());
 115
 116         // Find the decoder in the stack
 117         auto iter = stack_.begin();
 118         for (int i = 0; i < index; i++, iter++)
 119                 assert(iter != stack_.end());
 120
 121         // Delete the element
 122         stack_.erase(iter);
 123
 124         // Update channels and decoded data
 125         update_channel_list();
 126         begin_decode();
 127 }
 128
 129 bool DecodeSignal::toggle_decoder_visibility(int index)
 130 {
 131         auto iter = stack_.cbegin();
 132         for (int i = 0; i < index; i++, iter++)
 133                 assert(iter != stack_.end());
 134
 135         shared_ptr<Decoder> dec = *iter;
 136
 137         // Toggle decoder visibility
 138         bool state = false;
 139         if (dec) {
 140                 state = !dec->shown();
 141                 dec->show(state);
 142         }
 143
 144         return state;
 145 }
 146
 147 void DecodeSignal::reset_decode()
 148 {
 149         stop_srd_session();
 150
 151         annotation_count_ = 0;
 152         frame_complete_ = false;
 153         samples_decoded_ = 0;
 154         error_message_ = QString();
 155         rows_.clear();
 156         class_rows_.clear();
 157 }
 158
 159 void DecodeSignal::begin_decode()
 160 {
 161         if (decode_thread_.joinable()) {
 162                 decode_interrupt_ = true;
 163                 decode_input_cond_.notify_one();
 164                 decode_thread_.join();
 165         }
 166
 167         if (logic_mux_thread_.joinable()) {
 168                 logic_mux_interrupt_ = true;
 169                 logic_mux_cond_.notify_one();
 170                 logic_mux_thread_.join();
 171         }
 172
 173         reset_decode();
 174
 175         if (stack_.size() == 0) {
 176                 error_message_ = tr("No decoders");
 177                 return;
 178         }
 179
 180         assert(channels_.size() > 0);
 181
 182         if (get_assigned_signal_count() == 0) {
 183                 error_message_ = tr("There are no channels assigned to this decoder");
 184                 return;
 185         }
 186
 187         // Check that all decoders have the required channels
 188         for (const shared_ptr<decode::Decoder> &dec : stack_)
 189                 if (!dec->have_required_channels()) {
 190                         error_message_ = tr("One or more required channels "
 191                                 "have not been specified");
 192                         return;
 193                 }
 194
 195         // Add annotation classes
 196         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 197                 assert(dec);
 198                 const srd_decoder *const decc = dec->decoder();
 199                 assert(dec->decoder());
 200
 201                 // Add a row for the decoder if it doesn't have a row list
 202                 if (!decc->annotation_rows)
 203                         rows_[Row(decc)] = decode::RowData();
 204
 205                 // Add the decoder rows
 206                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 207                         const srd_decoder_annotation_row *const ann_row =
 208                                 (srd_decoder_annotation_row *)l->data;
 209                         assert(ann_row);
 210
 211                         const Row row(decc, ann_row);
 212
 213                         // Add a new empty row data object
 214                         rows_[row] = decode::RowData();
 215
 216                         // Map out all the classes
 217                         for (const GSList *ll = ann_row->ann_classes;
 218                                 ll; ll = ll->next)
 219                                 class_rows_[make_pair(decc,
 220                                         GPOINTER_TO_INT(ll->data))] = row;
 221                 }
 222         }
 223
 224         // Free the logic data and its segment(s) if it needs to be updated
 225         if (logic_mux_data_invalid_)
 226                 logic_mux_data_.reset();
 227
 228         if (!logic_mux_data_) {
 229                 const int64_t ch_count = get_assigned_signal_count();
 230                 const int64_t unit_size = (ch_count + 7) / 8;
 231                 logic_mux_data_ = make_shared<Logic>(ch_count);
 232                 segment_ = make_shared<LogicSegment>(*logic_mux_data_, unit_size, samplerate_);
 233                 logic_mux_data_->push_segment(segment_);
 234         }
 235
 236         // Make sure the logic output data is complete and up-to-date
 237         logic_mux_interrupt_ = false;
 238         logic_mux_thread_ = std::thread(&DecodeSignal::logic_mux_proc, this);
 239
 240         // Decode the muxed logic data
 241         decode_interrupt_ = false;
 242         decode_thread_ = std::thread(&DecodeSignal::decode_proc, this);
 243
 244         // Receive notifications when new sample data is available
 245         connect_input_notifiers();
 246 }
 247
 248 QString DecodeSignal::error_message() const
 249 {
 250         lock_guard<mutex> lock(output_mutex_);
 251         return error_message_;
 252 }
 253
 254 const vector<data::DecodeChannel> DecodeSignal::get_channels() const
 255 {
 256         return channels_;
 257 }
 258
 259 void DecodeSignal::auto_assign_signals()
 260 {
 261         bool new_assignment = false;
 262
 263         // Try to auto-select channels that don't have signals assigned yet
 264         for (data::DecodeChannel &ch : channels_) {
 265                 if (ch.assigned_signal)
 266                         continue;
 267
 268                 for (shared_ptr<data::SignalBase> s : session_.signalbases())
 269                         if (s->logic_data() && (ch.name.toLower().contains(s->name().toLower()))) {
 270                                 ch.assigned_signal = s.get();
 271                                 new_assignment = true;
 272                         }
 273         }
 274
 275         if (new_assignment) {
 276                 logic_mux_data_invalid_ = true;
 277                 commit_decoder_channels();
 278                 channels_updated();
 279         }
 280 }
 281
 282 void DecodeSignal::assign_signal(const uint16_t channel_id, const SignalBase *signal)
 283 {
 284         for (data::DecodeChannel &ch : channels_)
 285                 if (ch.id == channel_id) {
 286                         ch.assigned_signal = signal;
 287                         logic_mux_data_invalid_ = true;
 288                 }
 289
 290         commit_decoder_channels();
 291         channels_updated();
 292         begin_decode();
 293 }
 294
 295 int DecodeSignal::get_assigned_signal_count() const
 296 {
 297         // Count all channels that have a signal assigned to them
 298         return count_if(channels_.begin(), channels_.end(),
 299                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 300 }
 301
 302 void DecodeSignal::set_initial_pin_state(const uint16_t channel_id, const int init_state)
 303 {
 304         for (data::DecodeChannel &ch : channels_)
 305                 if (ch.id == channel_id)
 306                         ch.initial_pin_state = init_state;
 307
 308         channels_updated();
 309
 310         begin_decode();
 311 }
 312
 313 double DecodeSignal::samplerate() const
 314 {
 315         return samplerate_;
 316 }
 317
 318 const pv::util::Timestamp& DecodeSignal::start_time() const
 319 {
 320         return start_time_;
 321 }
 322
 323 int64_t DecodeSignal::get_working_sample_count() const
 324 {
 325         // The working sample count is the highest sample number for
 326         // which all used signals have data available, so go through
 327         // all channels and use the lowest overall sample count of the
 328         // current segment
 329
 330         // TODO Currently, we assume only a single segment exists
 331
 332         int64_t count = std::numeric_limits<int64_t>::max();
 333         bool no_signals_assigned = true;
 334
 335         for (const data::DecodeChannel &ch : channels_)
 336                 if (ch.assigned_signal) {
 337                         no_signals_assigned = false;
 338
 339                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 340                         if (!logic_data || logic_data->logic_segments().empty())
 341                                 return 0;
 342
 343                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 344                         count = min(count, (int64_t)segment->get_sample_count());
 345                 }
 346
 347         return (no_signals_assigned ? 0 : count);
 348 }
 349
 350 int64_t DecodeSignal::get_decoded_sample_count() const
 351 {
 352         lock_guard<mutex> decode_lock(output_mutex_);
 353         return samples_decoded_;
 354 }
 355
 356 vector<Row> DecodeSignal::visible_rows() const
 357 {
 358         lock_guard<mutex> lock(output_mutex_);
 359
 360         vector<Row> rows;
 361
 362         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 363                 assert(dec);
 364                 if (!dec->shown())
 365                         continue;
 366
 367                 const srd_decoder *const decc = dec->decoder();
 368                 assert(dec->decoder());
 369
 370                 // Add a row for the decoder if it doesn't have a row list
 371                 if (!decc->annotation_rows)
 372                         rows.emplace_back(decc);
 373
 374                 // Add the decoder rows
 375                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 376                         const srd_decoder_annotation_row *const ann_row =
 377                                 (srd_decoder_annotation_row *)l->data;
 378                         assert(ann_row);
 379                         rows.emplace_back(decc, ann_row);
 380                 }
 381         }
 382
 383         return rows;
 384 }
 385
 386 void DecodeSignal::get_annotation_subset(
 387         vector<pv::data::decode::Annotation> &dest,
 388         const decode::Row &row, uint64_t start_sample,
 389         uint64_t end_sample) const
 390 {
 391         lock_guard<mutex> lock(output_mutex_);
 392
 393         const auto iter = rows_.find(row);
 394         if (iter != rows_.end())
 395                 (*iter).second.get_annotation_subset(dest,
 396                         start_sample, end_sample);
 397 }
 398
 399 void DecodeSignal::save_settings(QSettings &settings) const
 400 {
 401         SignalBase::save_settings(settings);
 402
 403         // TODO Save decoder stack, channel mapping and decoder options
 404 }
 405
 406 void DecodeSignal::restore_settings(QSettings &settings)
 407 {
 408         SignalBase::restore_settings(settings);
 409
 410         // TODO Restore decoder stack, channel mapping and decoder options
 411 }
 412
 413 uint64_t DecodeSignal::inc_annotation_count()
 414 {
 415         return (annotation_count_++);
 416 }
 417
 418 void DecodeSignal::update_channel_list()
 419 {
 420         vector<data::DecodeChannel> prev_channels = channels_;
 421         channels_.clear();
 422
 423         uint16_t id = 0;
 424
 425         // Copy existing entries, create new as needed
 426         for (shared_ptr<Decoder> decoder : stack_) {
 427                 const srd_decoder* srd_d = decoder->decoder();
 428                 const GSList *l;
 429
 430                 // Mandatory channels
 431                 for (l = srd_d->channels; l; l = l->next) {
 432                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 433                         bool ch_added = false;
 434
 435                         // Copy but update ID if this channel was in the list before
 436                         for (data::DecodeChannel &ch : prev_channels)
 437                                 if (ch.pdch_ == pdch) {
 438                                         ch.id = id++;
 439                                         channels_.push_back(ch);
 440                                         ch_added = true;
 441                                         break;
 442                                 }
 443
 444                         if (!ch_added) {
 445                                 // Create new entry without a mapped signal
 446                                 data::DecodeChannel ch = {id++, false, nullptr,
 447                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 448                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 449                                 channels_.push_back(ch);
 450                         }
 451                 }
 452
 453                 // Optional channels
 454                 for (l = srd_d->opt_channels; l; l = l->next) {
 455                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 456                         bool ch_added = false;
 457
 458                         // Copy but update ID if this channel was in the list before
 459                         for (data::DecodeChannel &ch : prev_channels)
 460                                 if (ch.pdch_ == pdch) {
 461                                         ch.id = id++;
 462                                         channels_.push_back(ch);
 463                                         ch_added = true;
 464                                         break;
 465                                 }
 466
 467                         if (!ch_added) {
 468                                 // Create new entry without a mapped signal
 469                                 data::DecodeChannel ch = {id++, true, nullptr,
 470                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 471                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 472                                 channels_.push_back(ch);
 473                         }
 474                 }
 475         }
 476
 477         // Invalidate the logic output data if the channel assignment changed
 478         if (prev_channels.size() != channels_.size()) {
 479                 // The number of channels changed, there's definitely a difference
 480                 logic_mux_data_invalid_ = true;
 481         } else {
 482                 // Same number but assignment may still differ, so compare all channels
 483                 for (size_t i = 0; i < channels_.size(); i++) {
 484                         const data::DecodeChannel &p_ch = prev_channels[i];
 485                         const data::DecodeChannel &ch = channels_[i];
 486
 487                         if ((p_ch.pdch_ != ch.pdch_) ||
 488                                 (p_ch.assigned_signal != ch.assigned_signal)) {
 489                                 logic_mux_data_invalid_ = true;
 490                                 break;
 491                         }
 492                 }
 493
 494         }
 495
 496         channels_updated();
 497 }
 498
 499 void DecodeSignal::commit_decoder_channels()
 500 {
 501         // Submit channel list to every decoder, containing only the relevant channels
 502         for (shared_ptr<decode::Decoder> dec : stack_) {
 503                 vector<data::DecodeChannel*> channel_list;
 504
 505                 for (data::DecodeChannel &ch : channels_)
 506                         if (ch.decoder_ == dec)
 507                                 channel_list.push_back(&ch);
 508
 509                 dec->set_channels(channel_list);
 510         }
 511 }
 512
 513 void DecodeSignal::mux_logic_samples(const int64_t start, const int64_t end)
 514 {
 515         // Enforce end to be greater than start
 516         if (end <= start)
 517                 return;
 518
 519         // Fetch all segments and their data
 520         // TODO Currently, we assume only a single segment exists
 521         vector<shared_ptr<LogicSegment> > segments;
 522         vector<const uint8_t*> signal_data;
 523         vector<uint8_t> signal_in_bytepos;
 524         vector<uint8_t> signal_in_bitpos;
 525
 526         for (data::DecodeChannel &ch : channels_)
 527                 if (ch.assigned_signal) {
 528                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 529                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 530                         segments.push_back(segment);
 531                         signal_data.push_back(segment->get_samples(start, end));
 532
 533                         const int bitpos = ch.assigned_signal->logic_bit_index();
 534                         signal_in_bytepos.push_back(bitpos / 8);
 535                         signal_in_bitpos.push_back(bitpos % 8);
 536                 }
 537
 538         // Perform the muxing of signal data into the output data
 539         uint8_t* output = new uint8_t[(end - start) * segment_->unit_size()];
 540         unsigned int signal_count = signal_data.size();
 541
 542         for (int64_t sample_cnt = 0; sample_cnt < (end - start); sample_cnt++) {
 543                 int bitpos = 0;
 544                 uint8_t bytepos = 0;
 545
 546                 const int out_sample_pos = sample_cnt * segment_->unit_size();
 547                 for (unsigned int i = 0; i < segment_->unit_size(); i++)
 548                         output[out_sample_pos + i] = 0;
 549
 550                 for (unsigned int i = 0; i < signal_count; i++) {
 551                         const int in_sample_pos = sample_cnt * segments[i]->unit_size();
 552                         const uint8_t in_sample = 1 &
 553                                 ((signal_data[i][in_sample_pos + signal_in_bytepos[i]]) >> (signal_in_bitpos[i]));
 554
 555                         const uint8_t out_sample = output[out_sample_pos + bytepos];
 556
 557                         output[out_sample_pos + bytepos] = out_sample | (in_sample << bitpos);
 558
 559                         bitpos++;
 560                         if (bitpos > 7) {
 561                                 bitpos = 0;
 562                                 bytepos++;
 563                         }
 564                 }
 565         }
 566
 567         segment_->append_payload(output, (end - start) * segment_->unit_size());
 568         delete[] output;
 569
 570         for (const uint8_t* data : signal_data)
 571                 delete[] data;
 572 }
 573
 574 void DecodeSignal::logic_mux_proc()
 575 {
 576         do {
 577                 const uint64_t input_sample_count = get_working_sample_count();
 578                 const uint64_t output_sample_count = segment_->get_sample_count();
 579
 580                 const uint64_t samples_to_process =
 581                         (input_sample_count > output_sample_count) ?
 582                         (input_sample_count - output_sample_count) : 0;
 583
 584                 // Process the samples if necessary...
 585                 if (samples_to_process > 0) {
 586                         const uint64_t unit_size = segment_->unit_size();
 587                         const uint64_t chunk_sample_count = DecodeChunkLength / unit_size;
 588
 589                         uint64_t processed_samples = 0;
 590                         do {
 591                                 const uint64_t start_sample = output_sample_count + processed_samples;
 592                                 const uint64_t sample_count =
 593                                         min(samples_to_process - processed_samples,     chunk_sample_count);
 594
 595                                 mux_logic_samples(start_sample, start_sample + sample_count);
 596                                 processed_samples += sample_count;
 597
 598                                 // ...and process the newly muxed logic data
 599                                 decode_input_cond_.notify_one();
 600                         } while (processed_samples < samples_to_process);
 601                 }
 602
 603                 if (session_.get_capture_state() != Session::Stopped) {
 604                         // Wait for more input
 605                         unique_lock<mutex> logic_mux_lock(logic_mux_mutex_);
 606                         logic_mux_cond_.wait(logic_mux_lock);
 607                 }
 608         } while ((session_.get_capture_state() != Session::Stopped) && !logic_mux_interrupt_);
 609
 610         // No more input data and session is stopped, let the decode thread
 611         // process any pending data, terminate and release the global SRD mutex
 612         // in order to let other decoders run
 613         decode_input_cond_.notify_one();
 614 }
 615
 616 void DecodeSignal::query_input_metadata()
 617 {
 618         // Update the samplerate and start time because we cannot start
 619         // the libsrd session without the current samplerate
 620
 621         // TODO Currently we assume all channels have the same sample rate
 622         // and start time
 623         bool samplerate_valid = false;
 624
 625         auto any_channel = find_if(channels_.begin(), channels_.end(),
 626                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 627
 628         shared_ptr<Logic> logic_data =
 629                 any_channel->assigned_signal->logic_data();
 630
 631         do {
 632                 if (!logic_data->logic_segments().empty()) {
 633                         shared_ptr<LogicSegment> first_segment =
 634                                 any_channel->assigned_signal->logic_data()->logic_segments().front();
 635                         start_time_ = first_segment->start_time();
 636                         samplerate_ = first_segment->samplerate();
 637                         if (samplerate_ > 0)
 638                                 samplerate_valid = true;
 639                 }
 640
 641                 // Wait until input data is available or an interrupt was requested
 642                 unique_lock<mutex> input_wait_lock(input_mutex_);
 643                 decode_input_cond_.wait(input_wait_lock);
 644         } while (!samplerate_valid && !decode_interrupt_);
 645 }
 646
 647 void DecodeSignal::decode_data(
 648         const int64_t abs_start_samplenum, const int64_t sample_count)
 649 {
 650         const int64_t unit_size = segment_->unit_size();
 651         const int64_t chunk_sample_count = DecodeChunkLength / unit_size;
 652
 653         for (int64_t i = abs_start_samplenum;
 654                 !decode_interrupt_ && (i < (abs_start_samplenum + sample_count));
 655                 i += chunk_sample_count) {
 656
 657                 const int64_t chunk_end = min(i + chunk_sample_count,
 658                         abs_start_samplenum + sample_count);
 659
 660                 const uint8_t* chunk = segment_->get_samples(i, chunk_end);
 661
 662                 if (srd_session_send(srd_session_, i, chunk_end, chunk,
 663                                 (chunk_end - i) * unit_size, unit_size) != SRD_OK) {
 664                         error_message_ = tr("Decoder reported an error");
 665                         delete[] chunk;
 666                         break;
 667                 }
 668
 669                 delete[] chunk;
 670
 671                 {
 672                         lock_guard<mutex> lock(output_mutex_);
 673                         samples_decoded_ = chunk_end;
 674                 }
 675         }
 676 }
 677
 678 void DecodeSignal::decode_proc()
 679 {
 680         query_input_metadata();
 681
 682         if (decode_interrupt_)
 683                 return;
 684
 685         start_srd_session();
 686
 687         uint64_t sample_count;
 688         uint64_t abs_start_samplenum = 0;
 689         do {
 690                 // Keep processing new samples until we exhaust the input data
 691                 do {
 692                         // Prevent any other decode threads from accessing libsigrokdecode
 693                         lock_guard<mutex> srd_lock(global_srd_mutex_);
 694
 695                         {
 696                                 lock_guard<mutex> input_lock(input_mutex_);
 697                                 sample_count = segment_->get_sample_count() - abs_start_samplenum;
 698                         }
 699
 700                         if (sample_count > 0) {
 701                                 decode_data(abs_start_samplenum, sample_count);
 702                                 abs_start_samplenum += sample_count;
 703                         }
 704                 } while (error_message_.isEmpty() && (sample_count > 0));
 705
 706                 if (error_message_.isEmpty()) {
 707                         // Make sure all annotations are known to the frontend
 708                         new_annotations();
 709
 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         // Notify the frontend every DecodeNotifyPeriod annotations
 819         if (ds->inc_annotation_count() % DecodeNotifyPeriod == 0)
 820                 ds->new_annotations();
 821 }
 822
 823 void DecodeSignal::on_capture_state_changed(int state)
 824 {
 825         // If a new acquisition was started, we need to start decoding from scratch
 826         if (state == Session::Running)
 827                 begin_decode();
 828 }
 829
 830 void DecodeSignal::on_data_received()
 831 {
 832         logic_mux_cond_.notify_one();
 833 }
 834
 835 } // namespace data
 836 } // namespace pv