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         // TODO Currently we assume all channels have the same sample rate
 225         auto any_channel = find_if(channels_.begin(), channels_.end(),
 226                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 227         shared_ptr<LogicSegment> first_segment =
 228                         any_channel->assigned_signal->logic_data()->logic_segments().front();
 229         samplerate_ = first_segment->samplerate();
 230
 231         // Free the logic data and its segment(s) if it needs to be updated
 232         if (logic_mux_data_invalid_)
 233                 logic_mux_data_.reset();
 234
 235         if (!logic_mux_data_) {
 236                 const int64_t ch_count = get_assigned_signal_count();
 237                 const int64_t unit_size = (ch_count + 7) / 8;
 238                 logic_mux_data_ = make_shared<Logic>(ch_count);
 239                 segment_ = make_shared<LogicSegment>(*logic_mux_data_, unit_size, samplerate_);
 240                 logic_mux_data_->push_segment(segment_);
 241         }
 242
 243         // Update the samplerate and start time
 244         start_time_ = segment_->start_time();
 245         samplerate_ = segment_->samplerate();
 246         if (samplerate_ == 0.0)
 247                 samplerate_ = 1.0;
 248
 249         // Make sure the logic output data is complete and up-to-date
 250         logic_mux_interrupt_ = false;
 251         logic_mux_thread_ = std::thread(&DecodeSignal::logic_mux_proc, this);
 252
 253         // Decode the muxed logic data
 254         decode_interrupt_ = false;
 255         decode_thread_ = std::thread(&DecodeSignal::decode_proc, this);
 256
 257         // Receive notifications when new sample data is available
 258         connect_input_notifiers();
 259 }
 260
 261 QString DecodeSignal::error_message() const
 262 {
 263         lock_guard<mutex> lock(output_mutex_);
 264         return error_message_;
 265 }
 266
 267 const vector<data::DecodeChannel> DecodeSignal::get_channels() const
 268 {
 269         return channels_;
 270 }
 271
 272 void DecodeSignal::auto_assign_signals()
 273 {
 274         bool new_assignment = false;
 275
 276         // Try to auto-select channels that don't have signals assigned yet
 277         for (data::DecodeChannel &ch : channels_) {
 278                 if (ch.assigned_signal)
 279                         continue;
 280
 281                 for (shared_ptr<data::SignalBase> s : session_.signalbases())
 282                         if (s->logic_data() && (ch.name.toLower().contains(s->name().toLower()))) {
 283                                 ch.assigned_signal = s.get();
 284                                 new_assignment = true;
 285                         }
 286         }
 287
 288         if (new_assignment) {
 289                 logic_mux_data_invalid_ = true;
 290                 commit_decoder_channels();
 291                 channels_updated();
 292         }
 293 }
 294
 295 void DecodeSignal::assign_signal(const uint16_t channel_id, const SignalBase *signal)
 296 {
 297         for (data::DecodeChannel &ch : channels_)
 298                 if (ch.id == channel_id) {
 299                         ch.assigned_signal = signal;
 300                         logic_mux_data_invalid_ = true;
 301                 }
 302
 303         commit_decoder_channels();
 304         channels_updated();
 305         begin_decode();
 306 }
 307
 308 int DecodeSignal::get_assigned_signal_count() const
 309 {
 310         // Count all channels that have a signal assigned to them
 311         return count_if(channels_.begin(), channels_.end(),
 312                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 313 }
 314
 315 void DecodeSignal::set_initial_pin_state(const uint16_t channel_id, const int init_state)
 316 {
 317         for (data::DecodeChannel &ch : channels_)
 318                 if (ch.id == channel_id)
 319                         ch.initial_pin_state = init_state;
 320
 321         channels_updated();
 322
 323         begin_decode();
 324 }
 325
 326 double DecodeSignal::samplerate() const
 327 {
 328         return samplerate_;
 329 }
 330
 331 const pv::util::Timestamp& DecodeSignal::start_time() const
 332 {
 333         return start_time_;
 334 }
 335
 336 int64_t DecodeSignal::get_working_sample_count() const
 337 {
 338         // The working sample count is the highest sample number for
 339         // which all used signals have data available, so go through
 340         // all channels and use the lowest overall sample count of the
 341         // current segment
 342
 343         // TODO Currently, we assume only a single segment exists
 344
 345         int64_t count = std::numeric_limits<int64_t>::max();
 346         bool no_signals_assigned = true;
 347
 348         for (const data::DecodeChannel &ch : channels_)
 349                 if (ch.assigned_signal) {
 350                         no_signals_assigned = false;
 351
 352                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 353                         if (!logic_data || logic_data->logic_segments().empty())
 354                                 return 0;
 355
 356                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 357                         count = min(count, (int64_t)segment->get_sample_count());
 358                 }
 359
 360         return (no_signals_assigned ? 0 : count);
 361 }
 362
 363 int64_t DecodeSignal::get_decoded_sample_count() const
 364 {
 365         lock_guard<mutex> decode_lock(output_mutex_);
 366         return samples_decoded_;
 367 }
 368
 369 vector<Row> DecodeSignal::visible_rows() const
 370 {
 371         lock_guard<mutex> lock(output_mutex_);
 372
 373         vector<Row> rows;
 374
 375         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 376                 assert(dec);
 377                 if (!dec->shown())
 378                         continue;
 379
 380                 const srd_decoder *const decc = dec->decoder();
 381                 assert(dec->decoder());
 382
 383                 // Add a row for the decoder if it doesn't have a row list
 384                 if (!decc->annotation_rows)
 385                         rows.emplace_back(decc);
 386
 387                 // Add the decoder rows
 388                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 389                         const srd_decoder_annotation_row *const ann_row =
 390                                 (srd_decoder_annotation_row *)l->data;
 391                         assert(ann_row);
 392                         rows.emplace_back(decc, ann_row);
 393                 }
 394         }
 395
 396         return rows;
 397 }
 398
 399 void DecodeSignal::get_annotation_subset(
 400         vector<pv::data::decode::Annotation> &dest,
 401         const decode::Row &row, uint64_t start_sample,
 402         uint64_t end_sample) const
 403 {
 404         lock_guard<mutex> lock(output_mutex_);
 405
 406         const auto iter = rows_.find(row);
 407         if (iter != rows_.end())
 408                 (*iter).second.get_annotation_subset(dest,
 409                         start_sample, end_sample);
 410 }
 411
 412 void DecodeSignal::save_settings(QSettings &settings) const
 413 {
 414         SignalBase::save_settings(settings);
 415
 416         // TODO Save decoder stack, channel mapping and decoder options
 417 }
 418
 419 void DecodeSignal::restore_settings(QSettings &settings)
 420 {
 421         SignalBase::restore_settings(settings);
 422
 423         // TODO Restore decoder stack, channel mapping and decoder options
 424 }
 425
 426 uint64_t DecodeSignal::inc_annotation_count()
 427 {
 428         return (annotation_count_++);
 429 }
 430
 431 void DecodeSignal::update_channel_list()
 432 {
 433         vector<data::DecodeChannel> prev_channels = channels_;
 434         channels_.clear();
 435
 436         uint16_t id = 0;
 437
 438         // Copy existing entries, create new as needed
 439         for (shared_ptr<Decoder> decoder : stack_) {
 440                 const srd_decoder* srd_d = decoder->decoder();
 441                 const GSList *l;
 442
 443                 // Mandatory channels
 444                 for (l = srd_d->channels; l; l = l->next) {
 445                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 446                         bool ch_added = false;
 447
 448                         // Copy but update ID if this channel was in the list before
 449                         for (data::DecodeChannel &ch : prev_channels)
 450                                 if (ch.pdch_ == pdch) {
 451                                         ch.id = id++;
 452                                         channels_.push_back(ch);
 453                                         ch_added = true;
 454                                         break;
 455                                 }
 456
 457                         if (!ch_added) {
 458                                 // Create new entry without a mapped signal
 459                                 data::DecodeChannel ch = {id++, false, nullptr,
 460                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 461                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 462                                 channels_.push_back(ch);
 463                         }
 464                 }
 465
 466                 // Optional channels
 467                 for (l = srd_d->opt_channels; l; l = l->next) {
 468                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 469                         bool ch_added = false;
 470
 471                         // Copy but update ID if this channel was in the list before
 472                         for (data::DecodeChannel &ch : prev_channels)
 473                                 if (ch.pdch_ == pdch) {
 474                                         ch.id = id++;
 475                                         channels_.push_back(ch);
 476                                         ch_added = true;
 477                                         break;
 478                                 }
 479
 480                         if (!ch_added) {
 481                                 // Create new entry without a mapped signal
 482                                 data::DecodeChannel ch = {id++, true, nullptr,
 483                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 484                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 485                                 channels_.push_back(ch);
 486                         }
 487                 }
 488         }
 489
 490         // Invalidate the logic output data if the channel assignment changed
 491         if (prev_channels.size() != channels_.size()) {
 492                 // The number of channels changed, there's definitely a difference
 493                 logic_mux_data_invalid_ = true;
 494         } else {
 495                 // Same number but assignment may still differ, so compare all channels
 496                 for (size_t i = 0; i < channels_.size(); i++) {
 497                         const data::DecodeChannel &p_ch = prev_channels[i];
 498                         const data::DecodeChannel &ch = channels_[i];
 499
 500                         if ((p_ch.pdch_ != ch.pdch_) ||
 501                                 (p_ch.assigned_signal != ch.assigned_signal)) {
 502                                 logic_mux_data_invalid_ = true;
 503                                 break;
 504                         }
 505                 }
 506
 507         }
 508
 509         channels_updated();
 510 }
 511
 512 void DecodeSignal::commit_decoder_channels()
 513 {
 514         // Submit channel list to every decoder, containing only the relevant channels
 515         for (shared_ptr<decode::Decoder> dec : stack_) {
 516                 vector<data::DecodeChannel*> channel_list;
 517
 518                 for (data::DecodeChannel &ch : channels_)
 519                         if (ch.decoder_ == dec)
 520                                 channel_list.push_back(&ch);
 521
 522                 dec->set_channels(channel_list);
 523         }
 524 }
 525
 526 void DecodeSignal::mux_logic_samples(const int64_t start, const int64_t end)
 527 {
 528         // Enforce end to be greater than start
 529         if (end <= start)
 530                 return;
 531
 532         // Fetch all segments and their data
 533         // TODO Currently, we assume only a single segment exists
 534         vector<shared_ptr<LogicSegment> > segments;
 535         vector<const uint8_t*> signal_data;
 536         vector<uint8_t> signal_in_bytepos;
 537         vector<uint8_t> signal_in_bitpos;
 538
 539         for (data::DecodeChannel &ch : channels_)
 540                 if (ch.assigned_signal) {
 541                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 542                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 543                         segments.push_back(segment);
 544                         signal_data.push_back(segment->get_samples(start, end));
 545
 546                         const int bitpos = ch.assigned_signal->logic_bit_index();
 547                         signal_in_bytepos.push_back(bitpos / 8);
 548                         signal_in_bitpos.push_back(bitpos % 8);
 549                 }
 550
 551         // Perform the muxing of signal data into the output data
 552         uint8_t* output = new uint8_t[(end - start) * segment_->unit_size()];
 553         unsigned int signal_count = signal_data.size();
 554
 555         for (int64_t sample_cnt = 0; sample_cnt < (end - start); sample_cnt++) {
 556                 int bitpos = 0;
 557                 uint8_t bytepos = 0;
 558
 559                 const int out_sample_pos = sample_cnt * segment_->unit_size();
 560                 for (unsigned int i = 0; i < segment_->unit_size(); i++)
 561                         output[out_sample_pos + i] = 0;
 562
 563                 for (unsigned int i = 0; i < signal_count; i++) {
 564                         const int in_sample_pos = sample_cnt * segments[i]->unit_size();
 565                         const uint8_t in_sample = 1 &
 566                                 ((signal_data[i][in_sample_pos + signal_in_bytepos[i]]) >> (signal_in_bitpos[i]));
 567
 568                         const uint8_t out_sample = output[out_sample_pos + bytepos];
 569
 570                         output[out_sample_pos + bytepos] = out_sample | (in_sample << bitpos);
 571
 572                         bitpos++;
 573                         if (bitpos > 7) {
 574                                 bitpos = 0;
 575                                 bytepos++;
 576                         }
 577                 }
 578         }
 579
 580         segment_->append_payload(output, (end - start) * segment_->unit_size());
 581         delete[] output;
 582
 583         for (const uint8_t* data : signal_data)
 584                 delete[] data;
 585 }
 586
 587 void DecodeSignal::logic_mux_proc()
 588 {
 589         do {
 590                 const uint64_t input_sample_count = get_working_sample_count();
 591                 const uint64_t output_sample_count = segment_->get_sample_count();
 592
 593                 const uint64_t samples_to_process =
 594                         (input_sample_count > output_sample_count) ?
 595                         (input_sample_count - output_sample_count) : 0;
 596
 597                 // Process the samples if necessary...
 598                 if (samples_to_process > 0) {
 599                         const uint64_t unit_size = segment_->unit_size();
 600                         const uint64_t chunk_sample_count = DecodeChunkLength / unit_size;
 601
 602                         uint64_t processed_samples = 0;
 603                         do {
 604                                 const uint64_t start_sample = output_sample_count + processed_samples;
 605                                 const uint64_t sample_count =
 606                                         min(samples_to_process - processed_samples,     chunk_sample_count);
 607
 608                                 mux_logic_samples(start_sample, start_sample + sample_count);
 609                                 processed_samples += sample_count;
 610
 611                                 // ...and process the newly muxed logic data
 612                                 decode_input_cond_.notify_one();
 613                         } while (processed_samples < samples_to_process);
 614                 }
 615
 616                 if (session_.get_capture_state() != Session::Stopped) {
 617                         // Wait for more input
 618                         unique_lock<mutex> logic_mux_lock(logic_mux_mutex_);
 619                         logic_mux_cond_.wait(logic_mux_lock);
 620                 }
 621         } while ((session_.get_capture_state() != Session::Stopped) && !logic_mux_interrupt_);
 622
 623         // No more input data and session is stopped, let the decode thread
 624         // process any pending data, terminate and release the global SRD mutex
 625         // in order to let other decoders run
 626         decode_input_cond_.notify_one();
 627 }
 628
 629 void DecodeSignal::decode_data(
 630         const int64_t abs_start_samplenum, const int64_t sample_count)
 631 {
 632         const int64_t unit_size = segment_->unit_size();
 633         const int64_t chunk_sample_count = DecodeChunkLength / unit_size;
 634
 635         for (int64_t i = abs_start_samplenum;
 636                 !decode_interrupt_ && (i < (abs_start_samplenum + sample_count));
 637                 i += chunk_sample_count) {
 638
 639                 const int64_t chunk_end = min(i + chunk_sample_count,
 640                         abs_start_samplenum + sample_count);
 641
 642                 const uint8_t* chunk = segment_->get_samples(i, chunk_end);
 643
 644                 if (srd_session_send(srd_session_, i, chunk_end, chunk,
 645                                 (chunk_end - i) * unit_size, unit_size) != SRD_OK) {
 646                         error_message_ = tr("Decoder reported an error");
 647                         delete[] chunk;
 648                         break;
 649                 }
 650                 delete[] chunk;
 651
 652                 {
 653                         lock_guard<mutex> lock(output_mutex_);
 654                         samples_decoded_ = chunk_end;
 655                 }
 656         }
 657 }
 658
 659 void DecodeSignal::decode_proc()
 660 {
 661         start_srd_session();
 662
 663         uint64_t sample_count;
 664         uint64_t abs_start_samplenum = 0;
 665         do {
 666                 // Keep processing new samples until we exhaust the input data
 667                 do {
 668                         // Prevent any other decode threads from accessing libsigrokdecode
 669                         lock_guard<mutex> srd_lock(global_srd_mutex_);
 670
 671                         {
 672                                 lock_guard<mutex> input_lock(input_mutex_);
 673                                 sample_count = segment_->get_sample_count() - abs_start_samplenum;
 674                         }
 675
 676                         if (sample_count > 0) {
 677                                 decode_data(abs_start_samplenum, sample_count);
 678                                 abs_start_samplenum += sample_count;
 679                         }
 680                 } while (error_message_.isEmpty() && (sample_count > 0));
 681
 682                 if (error_message_.isEmpty()) {
 683                         // Make sure all annotations are known to the frontend
 684                         new_annotations();
 685
 686                         // Wait for new input data or an interrupt request
 687                         unique_lock<mutex> input_wait_lock(input_mutex_);
 688                         decode_input_cond_.wait(input_wait_lock);
 689                 }
 690         } while (error_message_.isEmpty() && !decode_interrupt_);
 691 }
 692
 693 void DecodeSignal::start_srd_session()
 694 {
 695         if (!srd_session_) {
 696                 // Create the session
 697                 srd_session_new(&srd_session_);
 698                 assert(srd_session_);
 699
 700                 // Create the decoders
 701                 srd_decoder_inst *prev_di = nullptr;
 702                 for (const shared_ptr<decode::Decoder> &dec : stack_) {
 703                         srd_decoder_inst *const di = dec->create_decoder_inst(srd_session_);
 704
 705                         if (!di) {
 706                                 error_message_ = tr("Failed to create decoder instance");
 707                                 srd_session_destroy(srd_session_);
 708                                 return;
 709                         }
 710
 711                         if (prev_di)
 712                                 srd_inst_stack(srd_session_, prev_di, di);
 713
 714                         prev_di = di;
 715                 }
 716
 717                 // Start the session
 718                 srd_session_metadata_set(srd_session_, SRD_CONF_SAMPLERATE,
 719                         g_variant_new_uint64(samplerate_));
 720
 721                 srd_pd_output_callback_add(srd_session_, SRD_OUTPUT_ANN,
 722                         DecodeSignal::annotation_callback, this);
 723
 724                 srd_session_start(srd_session_);
 725         }
 726 }
 727
 728 void DecodeSignal::stop_srd_session()
 729 {
 730         if (srd_session_) {
 731                 // Destroy the session
 732                 srd_session_destroy(srd_session_);
 733                 srd_session_ = nullptr;
 734         }
 735 }
 736
 737 void DecodeSignal::connect_input_notifiers()
 738 {
 739         // Disconnect the notification slot from the previous set of signals
 740         disconnect(this, SLOT(on_data_received()));
 741
 742         // Connect the currently used signals to our slot
 743         for (data::DecodeChannel &ch : channels_) {
 744                 if (!ch.assigned_signal)
 745                         continue;
 746
 747                 shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 748                 connect(logic_data.get(), SIGNAL(samples_added(QObject*, uint64_t, uint64_t)),
 749                         this, SLOT(on_data_received()));
 750         }
 751 }
 752
 753 void DecodeSignal::annotation_callback(srd_proto_data *pdata, void *decode_signal)
 754 {
 755         assert(pdata);
 756         assert(decoder);
 757
 758         DecodeSignal *const ds = (DecodeSignal*)decode_signal;
 759         assert(ds);
 760
 761         lock_guard<mutex> lock(ds->output_mutex_);
 762
 763         const decode::Annotation a(pdata);
 764
 765         // Find the row
 766         assert(pdata->pdo);
 767         assert(pdata->pdo->di);
 768         const srd_decoder *const decc = pdata->pdo->di->decoder;
 769         assert(decc);
 770
 771         auto row_iter = ds->rows_.end();
 772
 773         // Try looking up the sub-row of this class
 774         const auto r = ds->class_rows_.find(make_pair(decc, a.format()));
 775         if (r != ds->class_rows_.end())
 776                 row_iter = ds->rows_.find((*r).second);
 777         else {
 778                 // Failing that, use the decoder as a key
 779                 row_iter = ds->rows_.find(Row(decc));
 780         }
 781
 782         assert(row_iter != ds->rows_.end());
 783         if (row_iter == ds->rows_.end()) {
 784                 qDebug() << "Unexpected annotation: decoder = " << decc <<
 785                         ", format = " << a.format();
 786                 assert(false);
 787                 return;
 788         }
 789
 790         // Add the annotation
 791         (*row_iter).second.push_annotation(a);
 792
 793         // Notify the frontend every DecodeNotifyPeriod annotations
 794         if (ds->inc_annotation_count() % DecodeNotifyPeriod == 0)
 795                 ds->new_annotations();
 796 }
 797
 798 void DecodeSignal::on_capture_state_changed(int state)
 799 {
 800         // If a new acquisition was started, we need to start decoding from scratch
 801         if (state == Session::Running)
 802                 begin_decode();
 803 }
 804
 805 void DecodeSignal::on_data_received()
 806 {
 807         logic_mux_cond_.notify_one();
 808 }
 809
 810 } // namespace data
 811 } // namespace pv