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         connect(&session_, SIGNAL(data_received()),
  69                 this, SLOT(on_data_received()));
  70         connect(&session_, SIGNAL(frame_ended()),
  71                 this, SLOT(on_frame_ended()));
  72
  73         set_name(tr("Empty decoder signal"));
  74 }
  75
  76 DecodeSignal::~DecodeSignal()
  77 {
  78         if (decode_thread_.joinable()) {
  79                 decode_interrupt_ = true;
  80                 decode_input_cond_.notify_one();
  81                 decode_thread_.join();
  82         }
  83
  84         if (logic_mux_thread_.joinable()) {
  85                 logic_mux_interrupt_ = true;
  86                 logic_mux_cond_.notify_one();
  87                 logic_mux_thread_.join();
  88         }
  89
  90         stop_srd_session();
  91 }
  92
  93 const vector< shared_ptr<Decoder> >& DecodeSignal::decoder_stack() const
  94 {
  95         return stack_;
  96 }
  97
  98 void DecodeSignal::stack_decoder(srd_decoder *decoder)
  99 {
 100         assert(decoder);
 101         stack_.push_back(make_shared<decode::Decoder>(decoder));
 102
 103         // Set name if this decoder is the first in the list
 104         if (stack_.size() == 1)
 105                 set_name(QString::fromUtf8(decoder->name));
 106
 107         // Include the newly created decode channels in the channel lists
 108         update_channel_list();
 109
 110         auto_assign_signals();
 111         commit_decoder_channels();
 112         begin_decode();
 113 }
 114
 115 void DecodeSignal::remove_decoder(int index)
 116 {
 117         assert(index >= 0);
 118         assert(index < (int)stack_.size());
 119
 120         // Find the decoder in the stack
 121         auto iter = stack_.begin();
 122         for (int i = 0; i < index; i++, iter++)
 123                 assert(iter != stack_.end());
 124
 125         // Delete the element
 126         stack_.erase(iter);
 127
 128         // Update channels and decoded data
 129         update_channel_list();
 130         begin_decode();
 131 }
 132
 133 bool DecodeSignal::toggle_decoder_visibility(int index)
 134 {
 135         auto iter = stack_.cbegin();
 136         for (int i = 0; i < index; i++, iter++)
 137                 assert(iter != stack_.end());
 138
 139         shared_ptr<Decoder> dec = *iter;
 140
 141         // Toggle decoder visibility
 142         bool state = false;
 143         if (dec) {
 144                 state = !dec->shown();
 145                 dec->show(state);
 146         }
 147
 148         return state;
 149 }
 150
 151 void DecodeSignal::reset_decode()
 152 {
 153         stop_srd_session();
 154
 155         annotation_count_ = 0;
 156         frame_complete_ = false;
 157         samples_decoded_ = 0;
 158         error_message_ = QString();
 159         rows_.clear();
 160         class_rows_.clear();
 161 }
 162
 163 void DecodeSignal::begin_decode()
 164 {
 165         if (decode_thread_.joinable()) {
 166                 decode_interrupt_ = true;
 167                 decode_input_cond_.notify_one();
 168                 decode_thread_.join();
 169         }
 170
 171         if (logic_mux_thread_.joinable()) {
 172                 logic_mux_interrupt_ = true;
 173                 logic_mux_cond_.notify_one();
 174                 logic_mux_thread_.join();
 175         }
 176
 177         reset_decode();
 178
 179         if (stack_.size() == 0) {
 180                 error_message_ = tr("No decoders");
 181                 return;
 182         }
 183
 184         assert(channels_.size() > 0);
 185
 186         if (get_assigned_signal_count() == 0) {
 187                 error_message_ = tr("There are no channels assigned to this decoder");
 188                 return;
 189         }
 190
 191         // Check that all decoders have the required channels
 192         for (const shared_ptr<decode::Decoder> &dec : stack_)
 193                 if (!dec->have_required_channels()) {
 194                         error_message_ = tr("One or more required channels "
 195                                 "have not been specified");
 196                         return;
 197                 }
 198
 199         // Add annotation classes
 200         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 201                 assert(dec);
 202                 const srd_decoder *const decc = dec->decoder();
 203                 assert(dec->decoder());
 204
 205                 // Add a row for the decoder if it doesn't have a row list
 206                 if (!decc->annotation_rows)
 207                         rows_[Row(decc)] = decode::RowData();
 208
 209                 // Add the decoder rows
 210                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 211                         const srd_decoder_annotation_row *const ann_row =
 212                                 (srd_decoder_annotation_row *)l->data;
 213                         assert(ann_row);
 214
 215                         const Row row(decc, ann_row);
 216
 217                         // Add a new empty row data object
 218                         rows_[row] = decode::RowData();
 219
 220                         // Map out all the classes
 221                         for (const GSList *ll = ann_row->ann_classes;
 222                                 ll; ll = ll->next)
 223                                 class_rows_[make_pair(decc,
 224                                         GPOINTER_TO_INT(ll->data))] = row;
 225                 }
 226         }
 227
 228         // TODO Currently we assume all channels have the same sample rate
 229         auto any_channel = find_if(channels_.begin(), channels_.end(),
 230                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 231         shared_ptr<LogicSegment> first_segment =
 232                         any_channel->assigned_signal->logic_data()->logic_segments().front();
 233         samplerate_ = first_segment->samplerate();
 234
 235         // Free the logic data and its segment(s) if it needs to be updated
 236         if (logic_mux_data_invalid_)
 237                 logic_mux_data_.reset();
 238
 239         if (!logic_mux_data_) {
 240                 const int64_t ch_count = get_assigned_signal_count();
 241                 const int64_t unit_size = (ch_count + 7) / 8;
 242                 logic_mux_data_ = make_shared<Logic>(ch_count);
 243                 segment_ = make_shared<LogicSegment>(*logic_mux_data_, unit_size, samplerate_);
 244                 logic_mux_data_->push_segment(segment_);
 245         }
 246
 247         // Update the samplerate and start time
 248         start_time_ = segment_->start_time();
 249         samplerate_ = segment_->samplerate();
 250         if (samplerate_ == 0.0)
 251                 samplerate_ = 1.0;
 252
 253         // Make sure the logic output data is complete and up-to-date
 254         logic_mux_interrupt_ = false;
 255         logic_mux_thread_ = std::thread(&DecodeSignal::logic_mux_proc, this);
 256
 257         // Decode the muxed logic data
 258         decode_interrupt_ = false;
 259         decode_thread_ = std::thread(&DecodeSignal::decode_proc, this);
 260 }
 261
 262 QString DecodeSignal::error_message() const
 263 {
 264         lock_guard<mutex> lock(output_mutex_);
 265         return error_message_;
 266 }
 267
 268 const vector<data::DecodeChannel> DecodeSignal::get_channels() const
 269 {
 270         return channels_;
 271 }
 272
 273 void DecodeSignal::auto_assign_signals()
 274 {
 275         bool new_assignment = false;
 276
 277         // Try to auto-select channels that don't have signals assigned yet
 278         for (data::DecodeChannel &ch : channels_) {
 279                 if (ch.assigned_signal)
 280                         continue;
 281
 282                 for (shared_ptr<data::SignalBase> s : session_.signalbases())
 283                         if (s->logic_data() && (ch.name.toLower().contains(s->name().toLower()))) {
 284                                 ch.assigned_signal = s.get();
 285                                 new_assignment = true;
 286                         }
 287         }
 288
 289         if (new_assignment) {
 290                 logic_mux_data_invalid_ = true;
 291                 commit_decoder_channels();
 292                 channels_updated();
 293         }
 294 }
 295
 296 void DecodeSignal::assign_signal(const uint16_t channel_id, const SignalBase *signal)
 297 {
 298         for (data::DecodeChannel &ch : channels_)
 299                 if (ch.id == channel_id) {
 300                         ch.assigned_signal = signal;
 301                         logic_mux_data_invalid_ = true;
 302                 }
 303
 304         commit_decoder_channels();
 305         channels_updated();
 306         begin_decode();
 307 }
 308
 309 int DecodeSignal::get_assigned_signal_count() const
 310 {
 311         // Count all channels that have a signal assigned to them
 312         return count_if(channels_.begin(), channels_.end(),
 313                 [](data::DecodeChannel ch) { return ch.assigned_signal; });
 314 }
 315
 316 void DecodeSignal::set_initial_pin_state(const uint16_t channel_id, const int init_state)
 317 {
 318         for (data::DecodeChannel &ch : channels_)
 319                 if (ch.id == channel_id)
 320                         ch.initial_pin_state = init_state;
 321
 322         channels_updated();
 323
 324         begin_decode();
 325 }
 326
 327 double DecodeSignal::samplerate() const
 328 {
 329         return samplerate_;
 330 }
 331
 332 const pv::util::Timestamp& DecodeSignal::start_time() const
 333 {
 334         return start_time_;
 335 }
 336
 337 int64_t DecodeSignal::get_working_sample_count() const
 338 {
 339         // The working sample count is the highest sample number for
 340         // which all used signals have data available, so go through
 341         // all channels and use the lowest overall sample count of the
 342         // current segment
 343
 344         // TODO Currently, we assume only a single segment exists
 345
 346         int64_t count = std::numeric_limits<int64_t>::max();
 347         bool no_signals_assigned = true;
 348
 349         for (const data::DecodeChannel &ch : channels_)
 350                 if (ch.assigned_signal) {
 351                         no_signals_assigned = false;
 352
 353                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 354                         if (!logic_data || logic_data->logic_segments().empty())
 355                                 return 0;
 356
 357                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 358                         count = min(count, (int64_t)segment->get_sample_count());
 359                 }
 360
 361         return (no_signals_assigned ? 0 : count);
 362 }
 363
 364 int64_t DecodeSignal::get_decoded_sample_count() const
 365 {
 366         lock_guard<mutex> decode_lock(output_mutex_);
 367         return samples_decoded_;
 368 }
 369
 370 vector<Row> DecodeSignal::visible_rows() const
 371 {
 372         lock_guard<mutex> lock(output_mutex_);
 373
 374         vector<Row> rows;
 375
 376         for (const shared_ptr<decode::Decoder> &dec : stack_) {
 377                 assert(dec);
 378                 if (!dec->shown())
 379                         continue;
 380
 381                 const srd_decoder *const decc = dec->decoder();
 382                 assert(dec->decoder());
 383
 384                 // Add a row for the decoder if it doesn't have a row list
 385                 if (!decc->annotation_rows)
 386                         rows.emplace_back(decc);
 387
 388                 // Add the decoder rows
 389                 for (const GSList *l = decc->annotation_rows; l; l = l->next) {
 390                         const srd_decoder_annotation_row *const ann_row =
 391                                 (srd_decoder_annotation_row *)l->data;
 392                         assert(ann_row);
 393                         rows.emplace_back(decc, ann_row);
 394                 }
 395         }
 396
 397         return rows;
 398 }
 399
 400 void DecodeSignal::get_annotation_subset(
 401         vector<pv::data::decode::Annotation> &dest,
 402         const decode::Row &row, uint64_t start_sample,
 403         uint64_t end_sample) const
 404 {
 405         lock_guard<mutex> lock(output_mutex_);
 406
 407         const auto iter = rows_.find(row);
 408         if (iter != rows_.end())
 409                 (*iter).second.get_annotation_subset(dest,
 410                         start_sample, end_sample);
 411 }
 412
 413 void DecodeSignal::save_settings(QSettings &settings) const
 414 {
 415         SignalBase::save_settings(settings);
 416
 417         // TODO Save decoder stack, channel mapping and decoder options
 418 }
 419
 420 void DecodeSignal::restore_settings(QSettings &settings)
 421 {
 422         SignalBase::restore_settings(settings);
 423
 424         // TODO Restore decoder stack, channel mapping and decoder options
 425 }
 426
 427 uint64_t DecodeSignal::inc_annotation_count()
 428 {
 429         return (annotation_count_++);
 430 }
 431
 432 void DecodeSignal::update_channel_list()
 433 {
 434         vector<data::DecodeChannel> prev_channels = channels_;
 435         channels_.clear();
 436
 437         uint16_t id = 0;
 438
 439         // Copy existing entries, create new as needed
 440         for (shared_ptr<Decoder> decoder : stack_) {
 441                 const srd_decoder* srd_d = decoder->decoder();
 442                 const GSList *l;
 443
 444                 // Mandatory channels
 445                 for (l = srd_d->channels; l; l = l->next) {
 446                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 447                         bool ch_added = false;
 448
 449                         // Copy but update ID if this channel was in the list before
 450                         for (data::DecodeChannel &ch : prev_channels)
 451                                 if (ch.pdch_ == pdch) {
 452                                         ch.id = id++;
 453                                         channels_.push_back(ch);
 454                                         ch_added = true;
 455                                         break;
 456                                 }
 457
 458                         if (!ch_added) {
 459                                 // Create new entry without a mapped signal
 460                                 data::DecodeChannel ch = {id++, false, nullptr,
 461                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 462                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 463                                 channels_.push_back(ch);
 464                         }
 465                 }
 466
 467                 // Optional channels
 468                 for (l = srd_d->opt_channels; l; l = l->next) {
 469                         const struct srd_channel *const pdch = (struct srd_channel *)l->data;
 470                         bool ch_added = false;
 471
 472                         // Copy but update ID if this channel was in the list before
 473                         for (data::DecodeChannel &ch : prev_channels)
 474                                 if (ch.pdch_ == pdch) {
 475                                         ch.id = id++;
 476                                         channels_.push_back(ch);
 477                                         ch_added = true;
 478                                         break;
 479                                 }
 480
 481                         if (!ch_added) {
 482                                 // Create new entry without a mapped signal
 483                                 data::DecodeChannel ch = {id++, true, nullptr,
 484                                         QString::fromUtf8(pdch->name), QString::fromUtf8(pdch->desc),
 485                                         SRD_INITIAL_PIN_SAME_AS_SAMPLE0, decoder, pdch};
 486                                 channels_.push_back(ch);
 487                         }
 488                 }
 489         }
 490
 491         // Invalidate the logic output data if the channel assignment changed
 492         if (prev_channels.size() != channels_.size()) {
 493                 // The number of channels changed, there's definitely a difference
 494                 logic_mux_data_invalid_ = true;
 495         } else {
 496                 // Same number but assignment may still differ, so compare all channels
 497                 for (size_t i = 0; i < channels_.size(); i++) {
 498                         const data::DecodeChannel &p_ch = prev_channels[i];
 499                         const data::DecodeChannel &ch = channels_[i];
 500
 501                         if ((p_ch.pdch_ != ch.pdch_) ||
 502                                 (p_ch.assigned_signal != ch.assigned_signal)) {
 503                                 logic_mux_data_invalid_ = true;
 504                                 break;
 505                         }
 506                 }
 507
 508         }
 509
 510         channels_updated();
 511 }
 512
 513 void DecodeSignal::commit_decoder_channels()
 514 {
 515         // Submit channel list to every decoder, containing only the relevant channels
 516         for (shared_ptr<decode::Decoder> dec : stack_) {
 517                 vector<data::DecodeChannel*> channel_list;
 518
 519                 for (data::DecodeChannel &ch : channels_)
 520                         if (ch.decoder_ == dec)
 521                                 channel_list.push_back(&ch);
 522
 523                 dec->set_channels(channel_list);
 524         }
 525 }
 526
 527 void DecodeSignal::mux_logic_samples(const int64_t start, const int64_t end)
 528 {
 529         // Enforce end to be greater than start
 530         if (end <= start)
 531                 return;
 532
 533         // Fetch all segments and their data
 534         // TODO Currently, we assume only a single segment exists
 535         vector<shared_ptr<LogicSegment> > segments;
 536         vector<const uint8_t*> signal_data;
 537         vector<uint8_t> signal_in_bytepos;
 538         vector<uint8_t> signal_in_bitpos;
 539
 540         for (data::DecodeChannel &ch : channels_)
 541                 if (ch.assigned_signal) {
 542                         const shared_ptr<Logic> logic_data = ch.assigned_signal->logic_data();
 543                         const shared_ptr<LogicSegment> segment = logic_data->logic_segments().front();
 544                         segments.push_back(segment);
 545                         signal_data.push_back(segment->get_samples(start, end));
 546
 547                         const int bitpos = ch.assigned_signal->logic_bit_index();
 548                         signal_in_bytepos.push_back(bitpos / 8);
 549                         signal_in_bitpos.push_back(bitpos % 8);
 550                 }
 551
 552         // Perform the muxing of signal data into the output data
 553         uint8_t* output = new uint8_t[(end - start) * segment_->unit_size()];
 554         unsigned int signal_count = signal_data.size();
 555
 556         for (int64_t sample_cnt = 0; sample_cnt < (end - start); sample_cnt++) {
 557                 int bitpos = 0;
 558                 uint8_t bytepos = 0;
 559
 560                 const int out_sample_pos = sample_cnt * segment_->unit_size();
 561                 for (unsigned int i = 0; i < segment_->unit_size(); i++)
 562                         output[out_sample_pos + i] = 0;
 563
 564                 for (unsigned int i = 0; i < signal_count; i++) {
 565                         const int in_sample_pos = sample_cnt * segments[i]->unit_size();
 566                         const uint8_t in_sample = 1 &
 567                                 ((signal_data[i][in_sample_pos + signal_in_bytepos[i]]) >> (signal_in_bitpos[i]));
 568
 569                         const uint8_t out_sample = output[out_sample_pos + bytepos];
 570
 571                         output[out_sample_pos + bytepos] = out_sample | (in_sample << bitpos);
 572
 573                         bitpos++;
 574                         if (bitpos > 7) {
 575                                 bitpos = 0;
 576                                 bytepos++;
 577                         }
 578                 }
 579         }
 580
 581         segment_->append_payload(output, (end - start) * segment_->unit_size());
 582         delete[] output;
 583
 584         for (const uint8_t* data : signal_data)
 585                 delete[] data;
 586 }
 587
 588 void DecodeSignal::logic_mux_proc()
 589 {
 590         do {
 591
 592                 const uint64_t input_sample_count = get_working_sample_count();
 593                 const uint64_t output_sample_count = segment_->get_sample_count();
 594
 595                 const uint64_t samples_to_process =
 596                         (input_sample_count > output_sample_count) ?
 597                         (input_sample_count - output_sample_count) : 0;
 598
 599                 // Process the samples if necessary...
 600                 if (samples_to_process > 0) {
 601                         const uint64_t unit_size = segment_->unit_size();
 602                         const uint64_t chunk_sample_count = DecodeChunkLength / unit_size;
 603
 604                         uint64_t processed_samples = 0;
 605                         do {
 606                                 const uint64_t start_sample = output_sample_count + processed_samples;
 607                                 const uint64_t sample_count =
 608                                         min(samples_to_process - processed_samples,     chunk_sample_count);
 609
 610                                 mux_logic_samples(start_sample, start_sample + sample_count);
 611                                 processed_samples += sample_count;
 612
 613                                 // ...and process the newly muxed logic data
 614                                 decode_input_cond_.notify_one();
 615                         } while (processed_samples < samples_to_process);
 616                 }
 617
 618                 if (session_.get_capture_state() != Session::Stopped) {
 619                         // Wait for more input
 620                         unique_lock<mutex> logic_mux_lock(logic_mux_mutex_);
 621                         logic_mux_cond_.wait(logic_mux_lock);
 622                 }
 623         } while ((session_.get_capture_state() != Session::Stopped) && !logic_mux_interrupt_);
 624
 625         // No more input data and session is stopped, let the decode thread
 626         // process any pending data, terminate and release the global SRD mutex
 627         // in order to let other decoders run
 628         decode_input_cond_.notify_one();
 629 }
 630
 631 void DecodeSignal::decode_data(
 632         const int64_t abs_start_samplenum, const int64_t sample_count)
 633 {
 634         const int64_t unit_size = segment_->unit_size();
 635         const int64_t chunk_sample_count = DecodeChunkLength / unit_size;
 636
 637         for (int64_t i = abs_start_samplenum;
 638                 !decode_interrupt_ && (i < (abs_start_samplenum + sample_count));
 639                 i += chunk_sample_count) {
 640
 641                 const int64_t chunk_end = min(i + chunk_sample_count,
 642                         abs_start_samplenum + sample_count);
 643
 644                 const uint8_t* chunk = segment_->get_samples(i, chunk_end);
 645
 646                 if (srd_session_send(srd_session_, i, chunk_end, chunk,
 647                                 (chunk_end - i) * unit_size, unit_size) != SRD_OK) {
 648                         error_message_ = tr("Decoder reported an error");
 649                         delete[] chunk;
 650                         break;
 651                 }
 652                 delete[] chunk;
 653
 654                 {
 655                         lock_guard<mutex> lock(output_mutex_);
 656                         samples_decoded_ = chunk_end;
 657                 }
 658         }
 659 }
 660
 661 void DecodeSignal::decode_proc()
 662 {
 663         start_srd_session();
 664
 665         uint64_t sample_count;
 666         uint64_t abs_start_samplenum = 0;
 667         do {
 668                 // Keep processing new samples until we exhaust the input data
 669                 do {
 670                         // Prevent any other decode threads from accessing libsigrokdecode
 671                         lock_guard<mutex> srd_lock(global_srd_mutex_);
 672
 673                         {
 674                                 lock_guard<mutex> input_lock(input_mutex_);
 675                                 sample_count = segment_->get_sample_count() - abs_start_samplenum;
 676                         }
 677
 678                         if (sample_count > 0) {
 679                                 decode_data(abs_start_samplenum, sample_count);
 680                                 abs_start_samplenum += sample_count;
 681                         }
 682                 } while (error_message_.isEmpty() && (sample_count > 0));
 683
 684                 if (error_message_.isEmpty()) {
 685                         // Make sure all annotations are known to the frontend
 686                         new_annotations();
 687
 688                         // Wait for new input data or an interrupt request
 689                         unique_lock<mutex> input_wait_lock(input_mutex_);
 690                         decode_input_cond_.wait(input_wait_lock);
 691                 }
 692         } while (error_message_.isEmpty() && !decode_interrupt_);
 693 }
 694
 695 void DecodeSignal::start_srd_session()
 696 {
 697         if (!srd_session_) {
 698                 // Create the session
 699                 srd_session_new(&srd_session_);
 700                 assert(srd_session_);
 701
 702                 // Create the decoders
 703                 srd_decoder_inst *prev_di = nullptr;
 704                 for (const shared_ptr<decode::Decoder> &dec : stack_) {
 705                         srd_decoder_inst *const di = dec->create_decoder_inst(srd_session_);
 706
 707                         if (!di) {
 708                                 error_message_ = tr("Failed to create decoder instance");
 709                                 srd_session_destroy(srd_session_);
 710                                 return;
 711                         }
 712
 713                         if (prev_di)
 714                                 srd_inst_stack(srd_session_, prev_di, di);
 715
 716                         prev_di = di;
 717                 }
 718
 719                 // Start the session
 720                 srd_session_metadata_set(srd_session_, SRD_CONF_SAMPLERATE,
 721                         g_variant_new_uint64(samplerate_));
 722
 723                 srd_pd_output_callback_add(srd_session_, SRD_OUTPUT_ANN,
 724                         DecodeSignal::annotation_callback, this);
 725
 726                 srd_session_start(srd_session_);
 727         }
 728 }
 729
 730 void DecodeSignal::stop_srd_session()
 731 {
 732         if (srd_session_) {
 733                 // Destroy the session
 734                 srd_session_destroy(srd_session_);
 735                 srd_session_ = nullptr;
 736         }
 737 }
 738
 739 void DecodeSignal::annotation_callback(srd_proto_data *pdata, void *decode_signal)
 740 {
 741         assert(pdata);
 742         assert(decoder);
 743
 744         DecodeSignal *const ds = (DecodeSignal*)decode_signal;
 745         assert(ds);
 746
 747         lock_guard<mutex> lock(ds->output_mutex_);
 748
 749         const decode::Annotation a(pdata);
 750
 751         // Find the row
 752         assert(pdata->pdo);
 753         assert(pdata->pdo->di);
 754         const srd_decoder *const decc = pdata->pdo->di->decoder;
 755         assert(decc);
 756
 757         auto row_iter = ds->rows_.end();
 758
 759         // Try looking up the sub-row of this class
 760         const auto r = ds->class_rows_.find(make_pair(decc, a.format()));
 761         if (r != ds->class_rows_.end())
 762                 row_iter = ds->rows_.find((*r).second);
 763         else {
 764                 // Failing that, use the decoder as a key
 765                 row_iter = ds->rows_.find(Row(decc));
 766         }
 767
 768         assert(row_iter != ds->rows_.end());
 769         if (row_iter == ds->rows_.end()) {
 770                 qDebug() << "Unexpected annotation: decoder = " << decc <<
 771                         ", format = " << a.format();
 772                 assert(false);
 773                 return;
 774         }
 775
 776         // Add the annotation
 777         (*row_iter).second.push_annotation(a);
 778
 779         // Notify the frontend every DecodeNotifyPeriod annotations
 780         if (ds->inc_annotation_count() % DecodeNotifyPeriod == 0)
 781                 ds->new_annotations();
 782 }
 783
 784 void DecodeSignal::on_capture_state_changed(int state)
 785 {
 786         // If a new acquisition was started, we need to start decoding from scratch
 787         if (state == Session::Running)
 788                 begin_decode();
 789 }
 790
 791 void DecodeSignal::on_data_received()
 792 {
 793         logic_mux_cond_.notify_one();
 794 }
 795
 796 void DecodeSignal::on_frame_ended()
 797 {
 798         logic_mux_cond_.notify_one();
 799 }
 800
 801 } // namespace data
 802 } // namespace pv