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/view/logicsignal.h>
  36 #include <pv/view/decode/annotation.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< shared_ptr<view::decode::Annotation> >
  98         DecoderStack::annotations() const
  99 {
 100         lock_guard<mutex> lock(_mutex);
 101         return _annotations;
 102 }
 103
 104 QString DecoderStack::error_message()
 105 {
 106         lock_guard<mutex> lock(_mutex);
 107         return _error_message;
 108 }
 109
 110 void DecoderStack::begin_decode()
 111 {
 112         shared_ptr<pv::view::LogicSignal> logic_signal;
 113         shared_ptr<pv::data::Logic> data;
 114
 115         _decode_thread.interrupt();
 116         _decode_thread.join();
 117
 118         _samples_decoded = 0;
 119
 120         _annotations.clear();
 121
 122         // We get the logic data of the first probe in the list.
 123         // This works because we are currently assuming all
 124         // LogicSignals have the same data/snapshot
 125         BOOST_FOREACH (const shared_ptr<decode::Decoder> &dec, _stack)
 126                 if (dec && !dec->probes().empty() &&
 127                         ((logic_signal = (*dec->probes().begin()).second)) &&
 128                         ((data = logic_signal->logic_data())))
 129                         break;
 130
 131         if (!data)
 132                 return;
 133
 134         // Get the samplerate and start time
 135         _start_time = data->get_start_time();
 136         _samplerate = data->get_samplerate();
 137         if (_samplerate == 0.0)
 138                 _samplerate = 1.0;
 139
 140         _decode_thread = boost::thread(&DecoderStack::decode_proc, this,
 141                 data);
 142 }
 143
 144 void DecoderStack::clear()
 145 {
 146         _annotations.clear();
 147 }
 148
 149 void DecoderStack::decode_proc(shared_ptr<data::Logic> data)
 150 {
 151         srd_session *session;
 152         uint8_t chunk[DecodeChunkLength];
 153         srd_decoder_inst *prev_di = NULL;
 154
 155         assert(data);
 156
 157         const deque< shared_ptr<pv::data::LogicSnapshot> > &snapshots =
 158                 data->get_snapshots();
 159         if (snapshots.empty())
 160                 return;
 161
 162         const shared_ptr<pv::data::LogicSnapshot> &snapshot =
 163                 snapshots.front();
 164         const int64_t sample_count = snapshot->get_sample_count() - 1;
 165
 166         // Create the session
 167         srd_session_new(&session);
 168         assert(session);
 169
 170
 171         // Create the decoders
 172         BOOST_FOREACH(const shared_ptr<decode::Decoder> &dec, _stack)
 173         {
 174                 srd_decoder_inst *const di = dec->create_decoder_inst(session);
 175
 176                 if (!di)
 177                 {
 178                         _error_message = tr("Failed to initialise decoder");
 179                         srd_session_destroy(session);
 180                         return;
 181                 }
 182
 183                 if (prev_di)
 184                         srd_inst_stack (session, prev_di, di);
 185
 186                 prev_di = di;
 187         }
 188
 189         // Start the session
 190         srd_session_metadata_set(session, SRD_CONF_SAMPLERATE,
 191                 g_variant_new_uint64((uint64_t)_samplerate));
 192
 193         srd_pd_output_callback_add(session, SRD_OUTPUT_ANN,
 194                 DecoderStack::annotation_callback, this);
 195
 196         srd_session_start(session);
 197
 198         for (int64_t i = 0;
 199                 !this_thread::interruption_requested() && i < sample_count;
 200                 i += DecodeChunkLength)
 201         {
 202                 lock_guard<mutex> decode_lock(_global_decode_mutex);
 203
 204                 const int64_t chunk_end = min(
 205                         i + DecodeChunkLength, sample_count);
 206                 snapshot->get_samples(chunk, i, chunk_end);
 207
 208                 if (srd_session_send(session, i, i + sample_count,
 209                                 chunk, chunk_end - i) != SRD_OK) {
 210                         _error_message = tr("Failed to initialise decoder");
 211                         break;
 212                 }
 213
 214                 {
 215                         lock_guard<mutex> lock(_mutex);
 216                         _samples_decoded = chunk_end;
 217                 }
 218         }
 219
 220         // Destroy the session
 221         srd_session_destroy(session);
 222 }
 223
 224 void DecoderStack::annotation_callback(srd_proto_data *pdata, void *decoder)
 225 {
 226         using namespace pv::view::decode;
 227
 228         assert(pdata);
 229         assert(decoder);
 230
 231         DecoderStack *const d = (DecoderStack*)decoder;
 232
 233         shared_ptr<Annotation> a(new Annotation(pdata));
 234         lock_guard<mutex> lock(d->_mutex);
 235         d->_annotations.push_back(a);
 236
 237         d->new_decode_data();
 238 }
 239
 240 } // namespace data
 241 } // namespace pv