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/view/logicsignal.h>
  37
  38 using boost::lock_guard;
  39 using boost::mutex;
  40 using boost::shared_ptr;
  41 using std::deque;
  42 using std::min;
  43 using std::list;
  44 using std::vector;
  45
  46 namespace pv {
  47 namespace data {
  48
  49 const double DecoderStack::DecodeMargin = 1.0;
  50 const double DecoderStack::DecodeThreshold = 0.2;
  51 const int64_t DecoderStack::DecodeChunkLength = 4096;
  52
  53 mutex DecoderStack::_global_decode_mutex;
  54
  55 DecoderStack::DecoderStack(const srd_decoder *const dec) :
  56         _samples_decoded(0)
  57 {
  58         _stack.push_back(shared_ptr<decode::Decoder>(
  59                 new decode::Decoder(dec)));
  60 }
  61
  62 DecoderStack::~DecoderStack()
  63 {
  64         _decode_thread.interrupt();
  65         _decode_thread.join();
  66 }
  67
  68 const std::list< boost::shared_ptr<decode::Decoder> >&
  69 DecoderStack::stack() const
  70 {
  71         return _stack;
  72 }
  73
  74 void DecoderStack::push(boost::shared_ptr<decode::Decoder> decoder)
  75 {
  76         assert(decoder);
  77         _stack.push_back(decoder);
  78 }
  79
  80 void DecoderStack::remove(int index)
  81 {
  82         using pv::data::decode::Decoder;
  83
  84         assert(index >= 0);
  85         assert(index < (int)_stack.size());
  86
  87         // Find the decoder in the stack
  88         list< shared_ptr<Decoder> >::iterator iter = _stack.begin();
  89         for(int i = 0; i < index; i++, iter++)
  90                 assert(iter != _stack.end());
  91
  92         // Delete the element
  93         _stack.erase(iter);
  94 }
  95
  96 int64_t DecoderStack::samples_decoded() const
  97 {
  98         lock_guard<mutex> decode_lock(_mutex);
  99         return _samples_decoded;
 100 }
 101
 102 const vector<decode::Annotation> DecoderStack::annotations() const
 103 {
 104         lock_guard<mutex> lock(_mutex);
 105         return _annotations;
 106 }
 107
 108 QString DecoderStack::error_message()
 109 {
 110         lock_guard<mutex> lock(_mutex);
 111         return _error_message;
 112 }
 113
 114 void DecoderStack::begin_decode()
 115 {
 116         shared_ptr<pv::view::LogicSignal> logic_signal;
 117         shared_ptr<pv::data::Logic> data;
 118
 119         _decode_thread.interrupt();
 120         _decode_thread.join();
 121
 122         _samples_decoded = 0;
 123
 124         _annotations.clear();
 125
 126         // We get the logic data of the first probe in the list.
 127         // This works because we are currently assuming all
 128         // LogicSignals have the same data/snapshot
 129         BOOST_FOREACH (const shared_ptr<decode::Decoder> &dec, _stack)
 130                 if (dec && !dec->probes().empty() &&
 131                         ((logic_signal = (*dec->probes().begin()).second)) &&
 132                         ((data = logic_signal->logic_data())))
 133                         break;
 134
 135         if (!data)
 136                 return;
 137
 138         // Get the samplerate and start time
 139         _start_time = data->get_start_time();
 140         _samplerate = data->samplerate();
 141         if (_samplerate == 0.0)
 142                 _samplerate = 1.0;
 143
 144         _decode_thread = boost::thread(&DecoderStack::decode_proc, this,
 145                 data);
 146 }
 147
 148 void DecoderStack::clear()
 149 {
 150         _annotations.clear();
 151 }
 152
 153 uint64_t DecoderStack::get_max_sample_count() const
 154 {
 155         if (_annotations.empty())
 156                 return 0;
 157         return _annotations.back().end_sample();
 158 }
 159
 160 void DecoderStack::decode_proc(shared_ptr<data::Logic> data)
 161 {
 162         srd_session *session;
 163         uint8_t chunk[DecodeChunkLength];
 164         srd_decoder_inst *prev_di = NULL;
 165
 166         assert(data);
 167
 168         const deque< shared_ptr<pv::data::LogicSnapshot> > &snapshots =
 169                 data->get_snapshots();
 170         if (snapshots.empty())
 171                 return;
 172
 173         const shared_ptr<pv::data::LogicSnapshot> &snapshot =
 174                 snapshots.front();
 175         const int64_t sample_count = snapshot->get_sample_count() - 1;
 176
 177         // Create the session
 178         srd_session_new(&session);
 179         assert(session);
 180
 181
 182         // Create the decoders
 183         BOOST_FOREACH(const shared_ptr<decode::Decoder> &dec, _stack)
 184         {
 185                 srd_decoder_inst *const di = dec->create_decoder_inst(session);
 186
 187                 if (!di)
 188                 {
 189                         _error_message = tr("Failed to initialise decoder");
 190                         srd_session_destroy(session);
 191                         return;
 192                 }
 193
 194                 if (prev_di)
 195                         srd_inst_stack (session, prev_di, di);
 196
 197                 prev_di = di;
 198         }
 199
 200         // Start the session
 201         srd_session_metadata_set(session, SRD_CONF_SAMPLERATE,
 202                 g_variant_new_uint64((uint64_t)_samplerate));
 203
 204         srd_pd_output_callback_add(session, SRD_OUTPUT_ANN,
 205                 DecoderStack::annotation_callback, this);
 206
 207         srd_session_start(session);
 208
 209         for (int64_t i = 0;
 210                 !boost::this_thread::interruption_requested() &&
 211                         i < sample_count;
 212                 i += DecodeChunkLength)
 213         {
 214                 lock_guard<mutex> decode_lock(_global_decode_mutex);
 215
 216                 const int64_t chunk_end = min(
 217                         i + DecodeChunkLength, sample_count);
 218                 snapshot->get_samples(chunk, i, chunk_end);
 219
 220                 if (srd_session_send(session, i, i + sample_count,
 221                                 chunk, chunk_end - i) != SRD_OK) {
 222                         _error_message = tr("Failed to initialise decoder");
 223                         break;
 224                 }
 225
 226                 {
 227                         lock_guard<mutex> lock(_mutex);
 228                         _samples_decoded = chunk_end;
 229                 }
 230         }
 231
 232         // Destroy the session
 233         srd_session_destroy(session);
 234 }
 235
 236 void DecoderStack::annotation_callback(srd_proto_data *pdata, void *decoder)
 237 {
 238         using pv::data::decode::Annotation;
 239
 240         assert(pdata);
 241         assert(decoder);
 242
 243         DecoderStack *const d = (DecoderStack*)decoder;
 244
 245         lock_guard<mutex> lock(d->_mutex);
 246         d->_annotations.push_back(Annotation(pdata));
 247
 248         d->new_decode_data();
 249 }
 250
 251 } // namespace data
 252 } // namespace pv