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1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2017 Soeren Apel <soeren@apelpie.net>
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, see <http://www.gnu.org/licenses/>.
18  */
19
20 #ifndef PULSEVIEW_PV_DATA_DECODESIGNAL_HPP
21 #define PULSEVIEW_PV_DATA_DECODESIGNAL_HPP
22
23 #include <atomic>
24 #include <condition_variable>
25 #include <unordered_set>
26 #include <vector>
27
28 #include <QSettings>
29 #include <QString>
30
31 #include <libsigrokdecode/libsigrokdecode.h>
32
33 #include <pv/data/decode/row.hpp>
34 #include <pv/data/decode/rowdata.hpp>
35 #include <pv/data/signalbase.hpp>
36 #include <pv/util.hpp>
37
38 using std::atomic;
39 using std::condition_variable;
40 using std::map;
41 using std::mutex;
42 using std::pair;
43 using std::unordered_set;
44 using std::vector;
45 using std::shared_ptr;
46
47 namespace pv {
48 class Session;
49
50 namespace data {
51
52 namespace decode {
53 class Annotation;
54 class Decoder;
55 class Row;
56 }
57
58 class Logic;
59 class LogicSegment;
60 class SignalBase;
61 class SignalData;
62
63 struct DecodeChannel
64 {
65         uint16_t id;  // Also tells which bit within a sample represents this channel
66         const bool is_optional;
67         const pv::data::SignalBase *assigned_signal;
68         const QString name, desc;
69         int initial_pin_state;
70         const shared_ptr<pv::data::decode::Decoder> decoder_;
71         const srd_channel *pdch_;
72 };
73
74 class DecodeSignal : public SignalBase
75 {
76         Q_OBJECT
77
78 private:
79         static const double DecodeMargin;
80         static const double DecodeThreshold;
81         static const int64_t DecodeChunkLength;
82         static const unsigned int DecodeNotifyPeriod;
83
84 public:
85         DecodeSignal(pv::Session &session);
86         virtual ~DecodeSignal();
87
88         bool is_decode_signal() const;
89         const vector< shared_ptr<data::decode::Decoder> >& decoder_stack() const;
90
91         void stack_decoder(srd_decoder *decoder);
92         void remove_decoder(int index);
93         bool toggle_decoder_visibility(int index);
94
95         void reset_decode();
96         void begin_decode();
97         QString error_message() const;
98
99         const vector<data::DecodeChannel> get_channels() const;
100         void auto_assign_signals();
101         void assign_signal(const uint16_t channel_id, const SignalBase *signal);
102         int get_assigned_signal_count() const;
103
104         void set_initial_pin_state(const uint16_t channel_id, const int init_state);
105
106         double samplerate() const;
107         const pv::util::Timestamp& start_time() const;
108
109         /**
110          * Returns the number of samples that can be worked on,
111          * i.e. the number of samples where samples are available
112          * for all connected channels.
113          */
114         int64_t get_working_sample_count() const;
115
116         int64_t get_decoded_sample_count() const;
117
118         vector<decode::Row> visible_rows() const;
119
120         /**
121          * Extracts sorted annotations between two period into a vector.
122          */
123         void get_annotation_subset(
124                 vector<pv::data::decode::Annotation> &dest,
125                 const decode::Row &row, uint64_t start_sample,
126                 uint64_t end_sample) const;
127
128         virtual void save_settings(QSettings &settings) const;
129
130         virtual void restore_settings(QSettings &settings);
131
132         /**
133          * Helper function for static annotation_callback(),
134          * must be public so the function can access it.
135          * Don't use from outside this class.
136          */
137         uint64_t inc_annotation_count();
138
139 private:
140         void update_channel_list();
141
142         void commit_decoder_channels();
143
144         void mux_logic_samples(const int64_t start, const int64_t end);
145
146         void logic_mux_proc();
147
148         void query_input_metadata();
149
150         void decode_data(const int64_t abs_start_samplenum, const int64_t sample_count);
151
152         void decode_proc();
153
154         void start_srd_session();
155         void stop_srd_session();
156
157         void connect_input_notifiers();
158
159         static void annotation_callback(srd_proto_data *pdata, void *decode_signal);
160
161 Q_SIGNALS:
162         void new_annotations();
163         void channels_updated();
164
165 private Q_SLOTS:
166         void on_capture_state_changed(int state);
167         void on_data_received();
168
169 private:
170         pv::Session &session_;
171
172         vector<data::DecodeChannel> channels_;
173
174         struct srd_session *srd_session_;
175
176         shared_ptr<Logic> logic_mux_data_;
177         shared_ptr<LogicSegment> segment_;
178         bool logic_mux_data_invalid_;
179
180         pv::util::Timestamp start_time_;
181         double samplerate_;
182
183         int64_t annotation_count_, samples_decoded_;
184
185         vector< shared_ptr<decode::Decoder> > stack_;
186         map<const decode::Row, decode::RowData> rows_;
187         map<pair<const srd_decoder*, int>, decode::Row> class_rows_;
188
189         /**
190          * This mutex prevents more than one thread from accessing
191          * libsigrokdecode concurrently.
192          * @todo A proper solution should be implemented to allow multiple
193          * decode operations in parallel.
194          */
195         static mutex global_srd_mutex_;
196
197         mutable mutex input_mutex_, output_mutex_, logic_mux_mutex_;
198         mutable condition_variable decode_input_cond_, logic_mux_cond_;
199         bool frame_complete_;
200
201         std::thread decode_thread_, logic_mux_thread_;
202         atomic<bool> decode_interrupt_, logic_mux_interrupt_;
203
204         QString error_message_;
205 };
206
207 } // namespace data
208 } // namespace pv
209
210 #endif // PULSEVIEW_PV_DATA_DECODESIGNAL_HPP