Implement MathSignal

[pulseview.git] / pv / data / mathsignal.hpp

diff --git a/pv/data/mathsignal.hpp b/pv/data/mathsignal.hpp
index 04380cdc813f5d734f9dcaf7c356c0de5cb41747..f8e15d16261ba9ecbe74efe4015ba170241d00f4 100644 (file)
--- a/pv/data/mathsignal.hpp
+++ b/pv/data/mathsignal.hpp
@@ -20,13 +20,16 @@
 #ifndef PULSEVIEW_PV_DATA_MATHSIGNAL_HPP
 #define PULSEVIEW_PV_DATA_MATHSIGNAL_HPP
 
-#include <QSettings>
 #include <QString>
 
+#include <pv/exprtk.hpp>
+#include <pv/util.hpp>
 #include <pv/data/analog.hpp>
 #include <pv/data/signalbase.hpp>
-#include <pv/util.hpp>
 
+using std::atomic;
+using std::condition_variable;
+using std::mutex;
 using std::shared_ptr;
 
 namespace pv {
@@ -35,11 +38,12 @@ class Session;
 namespace data {
 
 class SignalBase;
-class SignalData;
 
 class MathSignal : public SignalBase
 {
        Q_OBJECT
+       Q_PROPERTY(QString expression READ get_expression WRITE set_expression NOTIFY expression_changed)
+       Q_PROPERTY(QString error_message READ error_message)
 
 private:
        static const int64_t ChunkLength;
@@ -51,6 +55,30 @@ public:
        virtual void save_settings(QSettings &settings) const;
        virtual void restore_settings(QSettings &settings);
 
+       QString error_message() const;
+
+       QString get_expression() const;
+       void set_expression(QString expression);
+
+private:
+       void set_error_message(QString msg);
+
+       /**
+        * Returns the number of samples that can be worked on,
+        * i.e. the number of samples where samples are available
+        * for all connected channels.
+        * If the math signal uses no input channels, this is the
+        * number of samples in the session.
+        */
+       uint64_t get_working_sample_count(uint32_t segment_id) const;
+
+       void reset_generation();
+       void begin_generation();
+
+       void generate_samples(uint32_t segment_id, const uint64_t start_sample,
+               const int64_t sample_count);
+       void generation_proc();
+
 Q_SIGNALS:
        void samples_cleared();
 
@@ -59,19 +87,34 @@ Q_SIGNALS:
 
        void min_max_changed(float min, float max);
 
-//private Q_SLOTS:
-//     void on_data_cleared();
-//     void on_data_received();
-
-//     void on_samples_added(SharedPtrToSegment segment, uint64_t start_sample,
-//             uint64_t end_sample);
+       void expression_changed(QString expression);
 
-//     void on_min_max_changed(float min, float max);
+private Q_SLOTS:
+       void on_capture_state_changed(int state);
+       void on_data_received();
 
 private:
        pv::Session &session_;
 
+       uint64_t custom_sample_rate_;
+       uint64_t custom_sample_count_;
+       bool use_custom_sample_rate_, use_custom_sample_count_;
+       vector< shared_ptr<SignalBase>> input_signals_;
+
+       QString expression_;
+
        QString error_message_;
+
+       mutable mutex input_mutex_;
+       mutable condition_variable gen_input_cond_;
+
+       std::thread gen_thread_;
+       atomic<bool> gen_interrupt_;
+
+       exprtk::symbol_table<double> *exprtk_symbol_table_;
+       exprtk::expression<double> *exprtk_expression_;
+       exprtk::parser<double> *exprtk_parser_;
+       double exprtk_current_time_, exprtk_current_sample_;
 };
 
 } // namespace data