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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 <stdexcept> | |
24 | ||
25 | #include <QDebug> | |
26 | ||
27 | #include "decoderstack.h" | |
28 | ||
29 | #include <pv/data/logic.h> | |
30 | #include <pv/data/logicsnapshot.h> | |
31 | #include <pv/data/decode/decoder.h> | |
32 | #include <pv/data/decode/annotation.h> | |
33 | #include <pv/sigsession.h> | |
34 | #include <pv/view/logicsignal.h> | |
35 | ||
36 | using std::lock_guard; | |
37 | using std::mutex; | |
38 | using boost::optional; | |
39 | using std::unique_lock; | |
40 | using std::deque; | |
41 | using std::make_pair; | |
42 | using std::max; | |
43 | using std::min; | |
44 | using std::list; | |
45 | using std::map; | |
46 | using std::pair; | |
47 | using std::shared_ptr; | |
48 | using std::vector; | |
49 | ||
50 | using namespace pv::data::decode; | |
51 | ||
52 | namespace pv { | |
53 | namespace data { | |
54 | ||
55 | const double DecoderStack::DecodeMargin = 1.0; | |
56 | const double DecoderStack::DecodeThreshold = 0.2; | |
57 | const int64_t DecoderStack::DecodeChunkLength = 4096; | |
58 | const unsigned int DecoderStack::DecodeNotifyPeriod = 65536; | |
59 | ||
60 | mutex DecoderStack::_global_decode_mutex; | |
61 | ||
62 | DecoderStack::DecoderStack(pv::SigSession &session, | |
63 | const srd_decoder *const dec) : | |
64 | _session(session), | |
65 | _sample_count(0), | |
66 | _frame_complete(false), | |
67 | _samples_decoded(0) | |
68 | { | |
69 | connect(&_session, SIGNAL(frame_began()), | |
70 | this, SLOT(on_new_frame())); | |
71 | connect(&_session, SIGNAL(data_received()), | |
72 | this, SLOT(on_data_received())); | |
73 | connect(&_session, SIGNAL(frame_ended()), | |
74 | this, SLOT(on_frame_ended())); | |
75 | ||
76 | _stack.push_back(shared_ptr<decode::Decoder>( | |
77 | new decode::Decoder(dec))); | |
78 | } | |
79 | ||
80 | DecoderStack::~DecoderStack() | |
81 | { | |
82 | if (_decode_thread.joinable()) { | |
83 | _interrupt = true; | |
84 | _decode_thread.join(); | |
85 | } | |
86 | } | |
87 | ||
88 | const std::list< std::shared_ptr<decode::Decoder> >& | |
89 | DecoderStack::stack() const | |
90 | { | |
91 | return _stack; | |
92 | } | |
93 | ||
94 | void DecoderStack::push(std::shared_ptr<decode::Decoder> decoder) | |
95 | { | |
96 | assert(decoder); | |
97 | _stack.push_back(decoder); | |
98 | } | |
99 | ||
100 | void DecoderStack::remove(int index) | |
101 | { | |
102 | assert(index >= 0); | |
103 | assert(index < (int)_stack.size()); | |
104 | ||
105 | // Find the decoder in the stack | |
106 | auto iter = _stack.begin(); | |
107 | for(int i = 0; i < index; i++, iter++) | |
108 | assert(iter != _stack.end()); | |
109 | ||
110 | // Delete the element | |
111 | _stack.erase(iter); | |
112 | } | |
113 | ||
114 | int64_t DecoderStack::samples_decoded() const | |
115 | { | |
116 | lock_guard<mutex> decode_lock(_output_mutex); | |
117 | return _samples_decoded; | |
118 | } | |
119 | ||
120 | std::vector<Row> DecoderStack::get_visible_rows() const | |
121 | { | |
122 | lock_guard<mutex> lock(_output_mutex); | |
123 | ||
124 | vector<Row> rows; | |
125 | ||
126 | for (const shared_ptr<decode::Decoder> &dec : _stack) | |
127 | { | |
128 | assert(dec); | |
129 | if (!dec->shown()) | |
130 | continue; | |
131 | ||
132 | const srd_decoder *const decc = dec->decoder(); | |
133 | assert(dec->decoder()); | |
134 | ||
135 | // Add a row for the decoder if it doesn't have a row list | |
136 | if (!decc->annotation_rows) | |
137 | rows.push_back(Row(decc)); | |
138 | ||
139 | // Add the decoder rows | |
140 | for (const GSList *l = decc->annotation_rows; l; l = l->next) | |
141 | { | |
142 | const srd_decoder_annotation_row *const ann_row = | |
143 | (srd_decoder_annotation_row *)l->data; | |
144 | assert(ann_row); | |
145 | rows.push_back(Row(decc, ann_row)); | |
146 | } | |
147 | } | |
148 | ||
149 | return rows; | |
150 | } | |
151 | ||
152 | void DecoderStack::get_annotation_subset( | |
153 | std::vector<pv::data::decode::Annotation> &dest, | |
154 | const Row &row, uint64_t start_sample, | |
155 | uint64_t end_sample) const | |
156 | { | |
157 | lock_guard<mutex> lock(_output_mutex); | |
158 | ||
159 | const auto iter = _rows.find(row); | |
160 | if (iter != _rows.end()) | |
161 | (*iter).second.get_annotation_subset(dest, | |
162 | start_sample, end_sample); | |
163 | } | |
164 | ||
165 | QString DecoderStack::error_message() | |
166 | { | |
167 | lock_guard<mutex> lock(_output_mutex); | |
168 | return _error_message; | |
169 | } | |
170 | ||
171 | void DecoderStack::clear() | |
172 | { | |
173 | _sample_count = 0; | |
174 | _frame_complete = false; | |
175 | _samples_decoded = 0; | |
176 | _error_message = QString(); | |
177 | _rows.clear(); | |
178 | _class_rows.clear(); | |
179 | } | |
180 | ||
181 | void DecoderStack::begin_decode() | |
182 | { | |
183 | shared_ptr<pv::view::LogicSignal> logic_signal; | |
184 | shared_ptr<pv::data::Logic> data; | |
185 | ||
186 | if (_decode_thread.joinable()) { | |
187 | _interrupt = true; | |
188 | _decode_thread.join(); | |
189 | } | |
190 | ||
191 | clear(); | |
192 | ||
193 | // Check that all decoders have the required channels | |
194 | for (const shared_ptr<decode::Decoder> &dec : _stack) | |
195 | if (!dec->have_required_probes()) { | |
196 | _error_message = tr("One or more required channels " | |
197 | "have not been specified"); | |
198 | return; | |
199 | } | |
200 | ||
201 | // Add classes | |
202 | for (const shared_ptr<decode::Decoder> &dec : _stack) | |
203 | { | |
204 | assert(dec); | |
205 | const srd_decoder *const decc = dec->decoder(); | |
206 | assert(dec->decoder()); | |
207 | ||
208 | // Add a row for the decoder if it doesn't have a row list | |
209 | if (!decc->annotation_rows) | |
210 | _rows[Row(decc)] = decode::RowData(); | |
211 | ||
212 | // Add the decoder rows | |
213 | for (const GSList *l = decc->annotation_rows; l; l = l->next) | |
214 | { | |
215 | const srd_decoder_annotation_row *const ann_row = | |
216 | (srd_decoder_annotation_row *)l->data; | |
217 | assert(ann_row); | |
218 | ||
219 | const Row row(decc, ann_row); | |
220 | ||
221 | // Add a new empty row data object | |
222 | _rows[row] = decode::RowData(); | |
223 | ||
224 | // Map out all the classes | |
225 | for (const GSList *ll = ann_row->ann_classes; | |
226 | ll; ll = ll->next) | |
227 | _class_rows[make_pair(decc, | |
228 | GPOINTER_TO_INT(ll->data))] = row; | |
229 | } | |
230 | } | |
231 | ||
232 | // We get the logic data of the first channel in the list. | |
233 | // This works because we are currently assuming all | |
234 | // LogicSignals have the same data/snapshot | |
235 | for (const shared_ptr<decode::Decoder> &dec : _stack) | |
236 | if (dec && !dec->channels().empty() && | |
237 | ((logic_signal = (*dec->channels().begin()).second)) && | |
238 | ((data = logic_signal->logic_data()))) | |
239 | break; | |
240 | ||
241 | if (!data) | |
242 | return; | |
243 | ||
244 | // Check we have a snapshot of data | |
245 | const deque< shared_ptr<pv::data::LogicSnapshot> > &snapshots = | |
246 | data->get_snapshots(); | |
247 | if (snapshots.empty()) | |
248 | return; | |
249 | _snapshot = snapshots.front(); | |
250 | ||
251 | // Get the samplerate and start time | |
252 | _start_time = data->get_start_time(); | |
253 | _samplerate = data->samplerate(); | |
254 | if (_samplerate == 0.0) | |
255 | _samplerate = 1.0; | |
256 | ||
257 | _interrupt = false; | |
258 | _decode_thread = std::thread(&DecoderStack::decode_proc, this); | |
259 | } | |
260 | ||
261 | uint64_t DecoderStack::get_max_sample_count() const | |
262 | { | |
263 | uint64_t max_sample_count = 0; | |
264 | ||
265 | for (auto i = _rows.cbegin(); i != _rows.end(); i++) | |
266 | max_sample_count = max(max_sample_count, | |
267 | (*i).second.get_max_sample()); | |
268 | ||
269 | return max_sample_count; | |
270 | } | |
271 | ||
272 | optional<int64_t> DecoderStack::wait_for_data() const | |
273 | { | |
274 | unique_lock<mutex> input_lock(_input_mutex); | |
275 | while(!_interrupt && !_frame_complete && | |
276 | _samples_decoded >= _sample_count) | |
277 | _input_cond.wait(input_lock); | |
278 | return boost::make_optional(!_interrupt && | |
279 | (_samples_decoded < _sample_count || !_frame_complete), | |
280 | _sample_count); | |
281 | } | |
282 | ||
283 | void DecoderStack::decode_data( | |
284 | const int64_t sample_count, const unsigned int unit_size, | |
285 | srd_session *const session) | |
286 | { | |
287 | uint8_t chunk[DecodeChunkLength]; | |
288 | ||
289 | const unsigned int chunk_sample_count = | |
290 | DecodeChunkLength / _snapshot->unit_size(); | |
291 | ||
292 | for (int64_t i = 0; !_interrupt && i < sample_count; | |
293 | i += chunk_sample_count) | |
294 | { | |
295 | lock_guard<mutex> decode_lock(_global_decode_mutex); | |
296 | ||
297 | const int64_t chunk_end = min( | |
298 | i + chunk_sample_count, sample_count); | |
299 | _snapshot->get_samples(chunk, i, chunk_end); | |
300 | ||
301 | if (srd_session_send(session, i, i + sample_count, chunk, | |
302 | (chunk_end - i) * unit_size) != SRD_OK) { | |
303 | _error_message = tr("Decoder reported an error"); | |
304 | break; | |
305 | } | |
306 | ||
307 | { | |
308 | lock_guard<mutex> lock(_output_mutex); | |
309 | _samples_decoded = chunk_end; | |
310 | } | |
311 | ||
312 | if (i % DecodeNotifyPeriod == 0) | |
313 | new_decode_data(); | |
314 | } | |
315 | ||
316 | new_decode_data(); | |
317 | } | |
318 | ||
319 | void DecoderStack::decode_proc() | |
320 | { | |
321 | optional<int64_t> sample_count; | |
322 | srd_session *session; | |
323 | srd_decoder_inst *prev_di = NULL; | |
324 | ||
325 | assert(_snapshot); | |
326 | ||
327 | // Create the session | |
328 | srd_session_new(&session); | |
329 | assert(session); | |
330 | ||
331 | // Create the decoders | |
332 | const unsigned int unit_size = _snapshot->unit_size(); | |
333 | ||
334 | for (const shared_ptr<decode::Decoder> &dec : _stack) | |
335 | { | |
336 | srd_decoder_inst *const di = dec->create_decoder_inst(session, unit_size); | |
337 | ||
338 | if (!di) | |
339 | { | |
340 | _error_message = tr("Failed to create decoder instance"); | |
341 | srd_session_destroy(session); | |
342 | return; | |
343 | } | |
344 | ||
345 | if (prev_di) | |
346 | srd_inst_stack (session, prev_di, di); | |
347 | ||
348 | prev_di = di; | |
349 | } | |
350 | ||
351 | // Get the intial sample count | |
352 | { | |
353 | unique_lock<mutex> input_lock(_input_mutex); | |
354 | sample_count = _sample_count = _snapshot->get_sample_count(); | |
355 | } | |
356 | ||
357 | // Start the session | |
358 | srd_session_metadata_set(session, SRD_CONF_SAMPLERATE, | |
359 | g_variant_new_uint64((uint64_t)_samplerate)); | |
360 | ||
361 | srd_pd_output_callback_add(session, SRD_OUTPUT_ANN, | |
362 | DecoderStack::annotation_callback, this); | |
363 | ||
364 | srd_session_start(session); | |
365 | ||
366 | do { | |
367 | decode_data(*sample_count, unit_size, session); | |
368 | } while(_error_message.isEmpty() && (sample_count = wait_for_data())); | |
369 | ||
370 | // Destroy the session | |
371 | srd_session_destroy(session); | |
372 | } | |
373 | ||
374 | void DecoderStack::annotation_callback(srd_proto_data *pdata, void *decoder) | |
375 | { | |
376 | assert(pdata); | |
377 | assert(decoder); | |
378 | ||
379 | DecoderStack *const d = (DecoderStack*)decoder; | |
380 | assert(d); | |
381 | ||
382 | lock_guard<mutex> lock(d->_output_mutex); | |
383 | ||
384 | const Annotation a(pdata); | |
385 | ||
386 | // Find the row | |
387 | assert(pdata->pdo); | |
388 | assert(pdata->pdo->di); | |
389 | const srd_decoder *const decc = pdata->pdo->di->decoder; | |
390 | assert(decc); | |
391 | ||
392 | auto row_iter = d->_rows.end(); | |
393 | ||
394 | // Try looking up the sub-row of this class | |
395 | const auto r = d->_class_rows.find(make_pair(decc, a.format())); | |
396 | if (r != d->_class_rows.end()) | |
397 | row_iter = d->_rows.find((*r).second); | |
398 | else | |
399 | { | |
400 | // Failing that, use the decoder as a key | |
401 | row_iter = d->_rows.find(Row(decc)); | |
402 | } | |
403 | ||
404 | assert(row_iter != d->_rows.end()); | |
405 | if (row_iter == d->_rows.end()) { | |
406 | qDebug() << "Unexpected annotation: decoder = " << decc << | |
407 | ", format = " << a.format(); | |
408 | assert(0); | |
409 | return; | |
410 | } | |
411 | ||
412 | // Add the annotation | |
413 | (*row_iter).second.push_annotation(a); | |
414 | } | |
415 | ||
416 | void DecoderStack::on_new_frame() | |
417 | { | |
418 | begin_decode(); | |
419 | } | |
420 | ||
421 | void DecoderStack::on_data_received() | |
422 | { | |
423 | { | |
424 | unique_lock<mutex> lock(_input_mutex); | |
425 | if (_snapshot) | |
426 | _sample_count = _snapshot->get_sample_count(); | |
427 | } | |
428 | _input_cond.notify_one(); | |
429 | } | |
430 | ||
431 | void DecoderStack::on_frame_ended() | |
432 | { | |
433 | { | |
434 | unique_lock<mutex> lock(_input_mutex); | |
435 | if (_snapshot) | |
436 | _frame_complete = true; | |
437 | } | |
438 | _input_cond.notify_one(); | |
439 | } | |
440 | ||
441 | } // namespace data | |
442 | } // namespace pv |