pv/data/decoderstack.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22
  23 #include <boost/foreach.hpp>
  24 #include <boost/thread/thread.hpp>
  25
  26 #include <stdexcept>
  27
  28 #include <QDebug>
  29
  30 #include "decoderstack.h"
  31
  32 #include <pv/data/logic.h>
  33 #include <pv/data/logicsnapshot.h>
  34 #include <pv/data/decode/decoder.h>
  35 #include <pv/data/decode/annotation.h>
  36 #include <pv/sigsession.h>
  37 #include <pv/view/logicsignal.h>
  38
  39 using boost::lock_guard;
  40 using boost::mutex;
  41 using boost::shared_ptr;
  42 using std::deque;
  43 using std::make_pair;
  44 using std::max;
  45 using std::min;
  46 using std::list;
  47 using std::map;
  48 using std::pair;
  49 using std::vector;
  50
  51 using namespace pv::data::decode;
  52
  53 namespace pv {
  54 namespace data {
  55
  56 const double DecoderStack::DecodeMargin = 1.0;
  57 const double DecoderStack::DecodeThreshold = 0.2;
  58 const int64_t DecoderStack::DecodeChunkLength = 4096;
  59
  60 mutex DecoderStack::_global_decode_mutex;
  61
  62 DecoderStack::DecoderStack(pv::SigSession &session,
  63         const srd_decoder *const dec) :
  64         _session(session),
  65         _samples_decoded(0)
  66 {
  67         connect(&_session, SIGNAL(frame_began()), this, SLOT(on_new_frame()));
  68
  69         _stack.push_back(shared_ptr<decode::Decoder>(
  70                 new decode::Decoder(dec)));
  71 }
  72
  73 DecoderStack::~DecoderStack()
  74 {
  75         if (_decode_thread.joinable()) {
  76                 _decode_thread.interrupt();
  77                 _decode_thread.join();
  78         }
  79 }
  80
  81 const std::list< boost::shared_ptr<decode::Decoder> >&
  82 DecoderStack::stack() const
  83 {
  84         return _stack;
  85 }
  86
  87 void DecoderStack::push(boost::shared_ptr<decode::Decoder> decoder)
  88 {
  89         assert(decoder);
  90         _stack.push_back(decoder);
  91 }
  92
  93 void DecoderStack::remove(int index)
  94 {
  95         assert(index >= 0);
  96         assert(index < (int)_stack.size());
  97
  98         // Find the decoder in the stack
  99         list< shared_ptr<Decoder> >::iterator iter = _stack.begin();
 100         for(int i = 0; i < index; i++, iter++)
 101                 assert(iter != _stack.end());
 102
 103         // Delete the element
 104         _stack.erase(iter);
 105 }
 106
 107 int64_t DecoderStack::samples_decoded() const
 108 {
 109         lock_guard<mutex> decode_lock(_output_mutex);
 110         return _samples_decoded;
 111 }
 112
 113 std::vector<Row> DecoderStack::get_visible_rows() const
 114 {
 115         lock_guard<mutex> lock(_output_mutex);
 116
 117         vector<Row> rows;
 118
 119         BOOST_FOREACH (const shared_ptr<decode::Decoder> &dec, _stack)
 120         {
 121                 assert(dec);
 122                 if (!dec->shown())
 123                         continue;
 124
 125                 const srd_decoder *const decc = dec->decoder();
 126                 assert(dec->decoder());
 127
 128                 // Add a row for the decoder if it doesn't have a row list
 129                 if (!decc->annotation_rows)
 130                         rows.push_back(Row(decc));
 131
 132                 // Add the decoder rows
 133                 for (const GSList *l = decc->annotation_rows; l; l = l->next)
 134                 {
 135                         const srd_decoder_annotation_row *const ann_row =
 136                                 (srd_decoder_annotation_row *)l->data;
 137                         assert(ann_row);
 138                         rows.push_back(Row(decc, ann_row));
 139                 }
 140         }
 141
 142         return rows;
 143 }
 144
 145 void DecoderStack::get_annotation_subset(
 146         std::vector<pv::data::decode::Annotation> &dest,
 147         const Row &row, uint64_t start_sample,
 148         uint64_t end_sample) const
 149 {
 150         lock_guard<mutex> lock(_output_mutex);
 151
 152         std::map<const Row, decode::RowData>::const_iterator iter =
 153                 _rows.find(row);
 154         if (iter != _rows.end())
 155                 (*iter).second.get_annotation_subset(dest,
 156                         start_sample, end_sample);
 157 }
 158
 159 QString DecoderStack::error_message()
 160 {
 161         lock_guard<mutex> lock(_output_mutex);
 162         return _error_message;
 163 }
 164
 165 void DecoderStack::clear()
 166 {
 167         _samples_decoded = 0;
 168         _error_message = QString();
 169         _rows.clear();
 170         _class_rows.clear();
 171 }
 172
 173 void DecoderStack::begin_decode()
 174 {
 175         shared_ptr<pv::view::LogicSignal> logic_signal;
 176         shared_ptr<pv::data::Logic> data;
 177
 178         if (_decode_thread.joinable()) {
 179                 _decode_thread.interrupt();
 180                 _decode_thread.join();
 181         }
 182
 183         clear();
 184
 185         // Add classes
 186         BOOST_FOREACH (const shared_ptr<decode::Decoder> &dec, _stack)
 187         {
 188                 assert(dec);
 189                 const srd_decoder *const decc = dec->decoder();
 190                 assert(dec->decoder());
 191
 192                 // Add a row for the decoder if it doesn't have a row list
 193                 if (!decc->annotation_rows)
 194                         _rows[Row(decc)] = decode::RowData();
 195
 196                 // Add the decoder rows
 197                 for (const GSList *l = decc->annotation_rows; l; l = l->next)
 198                 {
 199                         const srd_decoder_annotation_row *const ann_row =
 200                                 (srd_decoder_annotation_row *)l->data;
 201                         assert(ann_row);
 202
 203                         const Row row(decc, ann_row);
 204
 205                         // Add a new empty row data object
 206                         _rows[row] = decode::RowData();
 207
 208                         // Map out all the classes
 209                         for (const GSList *ll = ann_row->ann_classes;
 210                                 ll; ll = ll->next)
 211                                 _class_rows[make_pair(decc,
 212                                         GPOINTER_TO_INT(ll->data))] = row;
 213                 }
 214         }
 215
 216         // We get the logic data of the first probe in the list.
 217         // This works because we are currently assuming all
 218         // LogicSignals have the same data/snapshot
 219         BOOST_FOREACH (const shared_ptr<decode::Decoder> &dec, _stack)
 220                 if (dec && !dec->probes().empty() &&
 221                         ((logic_signal = (*dec->probes().begin()).second)) &&
 222                         ((data = logic_signal->logic_data())))
 223                         break;
 224
 225         if (!data)
 226                 return;
 227
 228         // Get the samplerate and start time
 229         _start_time = data->get_start_time();
 230         _samplerate = data->samplerate();
 231         if (_samplerate == 0.0)
 232                 _samplerate = 1.0;
 233
 234         _decode_thread = boost::thread(&DecoderStack::decode_proc, this,
 235                 data);
 236 }
 237
 238 uint64_t DecoderStack::get_max_sample_count() const
 239 {
 240         uint64_t max_sample_count = 0;
 241
 242         for (map<const Row, RowData>::const_iterator i = _rows.begin();
 243                 i != _rows.end(); i++)
 244                 max_sample_count = max(max_sample_count,
 245                         (*i).second.get_max_sample());
 246
 247         return max_sample_count;
 248 }
 249
 250 void DecoderStack::decode_data(
 251         const shared_ptr<pv::data::LogicSnapshot> &snapshot,
 252         srd_session *const session)
 253 {
 254         uint8_t chunk[DecodeChunkLength];
 255
 256         const int64_t sample_count = snapshot->get_sample_count();
 257         const unsigned int unit_size = snapshot->unit_size();
 258         const unsigned int chunk_sample_count =
 259                 DecodeChunkLength / snapshot->unit_size();
 260
 261         for (int64_t i = 0;
 262                 !boost::this_thread::interruption_requested() &&
 263                         i < sample_count;
 264                 i += chunk_sample_count)
 265         {
 266                 lock_guard<mutex> decode_lock(_global_decode_mutex);
 267
 268                 const int64_t chunk_end = min(
 269                         i + chunk_sample_count, sample_count);
 270                 snapshot->get_samples(chunk, i, chunk_end);
 271
 272                 if (srd_session_send(session, i, i + sample_count, chunk,
 273                                 (chunk_end - i) * unit_size) != SRD_OK) {
 274                         _error_message = tr("Decoder reported an error");
 275                         break;
 276                 }
 277
 278                 {
 279                         lock_guard<mutex> lock(_output_mutex);
 280                         _samples_decoded = chunk_end;
 281                 }
 282         }
 283
 284 }
 285
 286 void DecoderStack::decode_proc(shared_ptr<data::Logic> data)
 287 {
 288         srd_session *session;
 289         srd_decoder_inst *prev_di = NULL;
 290
 291         assert(data);
 292
 293         // Check we have a snapshot of data
 294         const deque< shared_ptr<pv::data::LogicSnapshot> > &snapshots =
 295                 data->get_snapshots();
 296         if (snapshots.empty())
 297                 return;
 298
 299         // Check that all decoders have the required probes
 300         BOOST_FOREACH(const shared_ptr<decode::Decoder> &dec, _stack)
 301                 if (!dec->have_required_probes())
 302                         return;
 303
 304         // Create the session
 305         srd_session_new(&session);
 306         assert(session);
 307
 308         // Create the decoders
 309         const shared_ptr<pv::data::LogicSnapshot> &snapshot = snapshots.front();
 310         const unsigned int unit_size = snapshot->unit_size();
 311
 312         BOOST_FOREACH(const shared_ptr<decode::Decoder> &dec, _stack)
 313         {
 314                 srd_decoder_inst *const di = dec->create_decoder_inst(session, unit_size);
 315
 316                 if (!di)
 317                 {
 318                         _error_message = tr("Failed to create decoder instance");
 319                         srd_session_destroy(session);
 320                         return;
 321                 }
 322
 323                 if (prev_di)
 324                         srd_inst_stack (session, prev_di, di);
 325
 326                 prev_di = di;
 327         }
 328
 329         // Start the session
 330         srd_session_metadata_set(session, SRD_CONF_SAMPLERATE,
 331                 g_variant_new_uint64((uint64_t)_samplerate));
 332
 333         srd_pd_output_callback_add(session, SRD_OUTPUT_ANN,
 334                 DecoderStack::annotation_callback, this);
 335
 336         srd_session_start(session);
 337
 338         decode_data(snapshot, session);
 339
 340         // Destroy the session
 341         srd_session_destroy(session);
 342 }
 343
 344 void DecoderStack::annotation_callback(srd_proto_data *pdata, void *decoder)
 345 {
 346         assert(pdata);
 347         assert(decoder);
 348
 349         DecoderStack *const d = (DecoderStack*)decoder;
 350         assert(d);
 351
 352         lock_guard<mutex> lock(d->_output_mutex);
 353
 354         const Annotation a(pdata);
 355
 356         // Find the row
 357         assert(pdata->pdo);
 358         assert(pdata->pdo->di);
 359         const srd_decoder *const decc = pdata->pdo->di->decoder;
 360         assert(decc);
 361
 362         map<const Row, decode::RowData>::iterator row_iter = d->_rows.end();
 363
 364         // Try looking up the sub-row of this class
 365         const map<pair<const srd_decoder*, int>, Row>::const_iterator r =
 366                 d->_class_rows.find(make_pair(decc, a.format()));
 367         if (r != d->_class_rows.end())
 368                 row_iter = d->_rows.find((*r).second);
 369         else
 370         {
 371                 // Failing that, use the decoder as a key
 372                 row_iter = d->_rows.find(Row(decc));
 373         }
 374
 375         assert(row_iter != d->_rows.end());
 376         if (row_iter == d->_rows.end()) {
 377                 qDebug() << "Unexpected annotation: decoder = " << decc <<
 378                         ", format = " << a.format();
 379                 assert(0);
 380                 return;
 381         }
 382
 383         // Add the annotation
 384         (*row_iter).second.push_annotation(a);
 385
 386         d->new_decode_data();
 387 }
 388
 389 void DecoderStack::on_new_frame()
 390 {
 391         begin_decode();
 392 }
 393
 394 } // namespace data
 395 } // namespace pv