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