#include <pv/data/analogsegment.hpp>
#include <pv/data/signalbase.hpp>
+using std::dynamic_pointer_cast;
using std::make_shared;
+using std::min;
+using std::unique_lock;
namespace pv {
namespace data {
const int64_t MathSignal::ChunkLength = 256 * 1024;
+template<typename T>
+struct sig_sample : public exprtk::igeneric_function<T>
+{
+ typedef typename exprtk::igeneric_function<T>::parameter_list_t parameter_list_t;
+ typedef typename exprtk::igeneric_function<T>::generic_type generic_type;
+ typedef typename generic_type::scalar_view scalar_t;
+ typedef typename generic_type::string_view string_t;
+
+ sig_sample(MathSignal& owner) :
+ exprtk::igeneric_function<T>("ST"), // Require channel name and sample number
+ owner_(owner),
+ sig_data(nullptr)
+ {
+ }
+
+ T operator()(parameter_list_t parameters)
+ {
+ const string_t exprtk_sig_name = string_t(parameters[0]);
+ const scalar_t exprtk_sample_num = scalar_t(parameters[1]);
+
+ const std::string str_sig_name = to_str(exprtk_sig_name);
+ const double sample_num = exprtk_sample_num();
+
+ if (!sig_data)
+ sig_data = owner_.signal_from_name(str_sig_name);
+
+ assert(sig_data);
+ owner_.update_signal_sample(sig_data, current_segment, sample_num);
+
+ return T(sig_data->sample_value);
+ }
+
+ MathSignal& owner_;
+ uint32_t current_segment;
+ signal_data* sig_data;
+};
+
+
MathSignal::MathSignal(pv::Session &session) :
SignalBase(nullptr, SignalBase::MathChannel),
- session_(session)
+ session_(session),
+ use_custom_sample_rate_(false),
+ use_custom_sample_count_(false),
+ expression_(""),
+ error_message_(""),
+ exprtk_unknown_symbol_table_(nullptr),
+ exprtk_symbol_table_(nullptr),
+ exprtk_expression_(nullptr),
+ exprtk_parser_(nullptr),
+ fnc_sig_sample_(nullptr)
{
- shared_ptr<data::Analog> data(new data::Analog());
- set_data(data);
+ set_name(QString(tr("Math%1")).arg(session_.get_next_signal_index(MathChannel)));
+
+ set_data(std::make_shared<data::Analog>());
- shared_ptr<data::AnalogSegment> segment = make_shared<data::AnalogSegment>(
- *data, data->get_segment_count(), session.get_samplerate());
+ connect(&session_, SIGNAL(capture_state_changed(int)),
+ this, SLOT(on_capture_state_changed(int)));
+ connect(&session_, SIGNAL(data_received()),
+ this, SLOT(on_data_received()));
- data->push_segment(segment);
+ expression_ = "sin(2 * pi * t) + cos(t / 2 * pi)";
}
MathSignal::~MathSignal()
{
+ reset_generation();
+
+ if (fnc_sig_sample_)
+ delete fnc_sig_sample_;
}
void MathSignal::save_settings(QSettings &settings) const
{
- (void)settings;
+ settings.setValue("expression", expression_);
+
+ settings.setValue("custom_sample_rate", (qulonglong)custom_sample_rate_);
+ settings.setValue("custom_sample_count", (qulonglong)custom_sample_count_);
+ settings.setValue("use_custom_sample_rate", use_custom_sample_rate_);
+ settings.setValue("use_custom_sample_count", use_custom_sample_count_);
}
void MathSignal::restore_settings(QSettings &settings)
{
- (void)settings;
+ if (settings.contains("expression"))
+ expression_ = settings.value("expression").toString();
+
+ if (settings.contains("custom_sample_rate"))
+ custom_sample_rate_ = settings.value("custom_sample_rate").toULongLong();
+
+ if (settings.contains("custom_sample_count"))
+ custom_sample_count_ = settings.value("custom_sample_count").toULongLong();
+
+ if (settings.contains("use_custom_sample_rate"))
+ use_custom_sample_rate_ = settings.value("use_custom_sample_rate").toBool();
+
+ if (settings.contains("use_custom_sample_count"))
+ use_custom_sample_count_ = settings.value("use_custom_sample_count").toBool();
+}
+
+QString MathSignal::error_message() const
+{
+ return error_message_;
+}
+
+QString MathSignal::get_expression() const
+{
+ return expression_;
+}
+
+void MathSignal::set_expression(QString expression)
+{
+ expression_ = expression;
+
+ begin_generation();
+}
+
+void MathSignal::set_error_message(QString msg)
+{
+ error_message_ = msg;
+ // TODO Emulate noquote()
+ qDebug().nospace() << name() << ": " << msg << "(Expression: '" << expression_ << "')";
+}
+
+uint64_t MathSignal::get_working_sample_count(uint32_t segment_id) const
+{
+ // The working sample count is the highest sample number for
+ // which all used signals have data available, so go through all
+ // channels and use the lowest overall sample count of the segment
+
+ int64_t result = std::numeric_limits<int64_t>::max();
+
+ if (use_custom_sample_count_)
+ // A custom sample count implies that only one segment will be created
+ result = (segment_id == 0) ? custom_sample_count_ : 0;
+ else {
+ if (input_signals_.size() > 0) {
+ for (auto input_signal : input_signals_) {
+ const shared_ptr<SignalBase>& sb = input_signal.second.sb;
+
+ shared_ptr<Analog> a = sb->analog_data();
+ const uint32_t last_segment = (a->analog_segments().size() - 1);
+ if (segment_id > last_segment)
+ continue;
+ const shared_ptr<AnalogSegment> segment = a->analog_segments()[segment_id];
+ result = min(result, (int64_t)segment->get_sample_count());
+ }
+ } else
+ result = session_.get_segment_sample_count(segment_id);
+ }
+
+ return result;
+}
+
+void MathSignal::reset_generation()
+{
+ if (gen_thread_.joinable()) {
+ gen_interrupt_ = true;
+ gen_input_cond_.notify_one();
+ gen_thread_.join();
+ }
+
+ data_->clear();
+ input_signals_.clear();
+
+ if (exprtk_parser_) {
+ delete exprtk_parser_;
+ exprtk_parser_ = nullptr;
+ }
+
+ if (exprtk_expression_) {
+ delete exprtk_expression_;
+ exprtk_expression_ = nullptr;
+ }
+
+ if (exprtk_symbol_table_) {
+ delete exprtk_symbol_table_;
+ exprtk_symbol_table_ = nullptr;
+ }
+
+ if (exprtk_unknown_symbol_table_) {
+ delete exprtk_unknown_symbol_table_;
+ exprtk_unknown_symbol_table_ = nullptr;
+ }
+
+ if (fnc_sig_sample_) {
+ delete fnc_sig_sample_;
+ fnc_sig_sample_ = nullptr;
+ }
+
+ if (!error_message_.isEmpty()) {
+ error_message_ = QString();
+ // TODO Emulate noquote()
+ qDebug().nospace() << name() << ": Error cleared";
+ }
+}
+
+void MathSignal::begin_generation()
+{
+ reset_generation();
+
+ if (expression_.isEmpty()) {
+ set_error_message(tr("No expression defined, nothing to do"));
+ return;
+ }
+
+ fnc_sig_sample_ = new sig_sample<double>(*this);
+
+ exprtk_unknown_symbol_table_ = new exprtk::symbol_table<double>();
+
+ exprtk_symbol_table_ = new exprtk::symbol_table<double>();
+ exprtk_symbol_table_->add_function("sig_sample", *fnc_sig_sample_);
+ exprtk_symbol_table_->add_variable("t", exprtk_current_time_);
+ exprtk_symbol_table_->add_variable("s", exprtk_current_sample_);
+ exprtk_symbol_table_->add_constants();
+
+ exprtk_expression_ = new exprtk::expression<double>();
+ exprtk_expression_->register_symbol_table(*exprtk_unknown_symbol_table_);
+ exprtk_expression_->register_symbol_table(*exprtk_symbol_table_);
+
+ exprtk_parser_ = new exprtk::parser<double>();
+ exprtk_parser_->enable_unknown_symbol_resolver();
+
+ if (!exprtk_parser_->compile(expression_.toStdString(), *exprtk_expression_)) {
+ set_error_message(tr("Error in expression"));
+ } else {
+ // Resolve unknown scalars to signals and add them to the input signal list
+ vector<string> unknowns;
+ exprtk_unknown_symbol_table_->get_variable_list(unknowns);
+ for (string& unknown : unknowns) {
+ signal_data* sig_data = signal_from_name(unknown);
+ const shared_ptr<SignalBase> signal = (sig_data) ? (sig_data->sb) : nullptr;
+ if (!signal || (!signal->analog_data())) {
+ set_error_message(QString(tr("%1 isn't a valid signal")).arg(
+ QString::fromStdString(unknown)));
+ } else
+ sig_data->ref = &(exprtk_unknown_symbol_table_->variable_ref(unknown));
+ }
+ }
+
+ if (error_message_.isEmpty()) {
+ gen_interrupt_ = false;
+ gen_thread_ = std::thread(&MathSignal::generation_proc, this);
+ }
+}
+
+void MathSignal::generate_samples(uint32_t segment_id, const uint64_t start_sample,
+ const int64_t sample_count)
+{
+ shared_ptr<Analog> analog = dynamic_pointer_cast<Analog>(data_);
+ shared_ptr<AnalogSegment> segment = analog->analog_segments().at(segment_id);
+
+ // Keep the math functions segment IDs in sync
+ fnc_sig_sample_->current_segment = segment_id;
+
+ const double sample_rate = data_->get_samplerate();
+
+ exprtk_current_sample_ = start_sample;
+
+ float *sample_data = new float[sample_count];
+
+ for (int64_t i = 0; i < sample_count; i++) {
+ exprtk_current_time_ = exprtk_current_sample_ / sample_rate;
+
+ for (auto& entry : input_signals_) {
+ signal_data* sig_data = &(entry.second);
+ update_signal_sample(sig_data, segment_id, exprtk_current_sample_);
+ }
+
+ double value = exprtk_expression_->value();
+ sample_data[i] = value;
+ exprtk_current_sample_ += 1;
+ }
+
+ segment->append_interleaved_samples(sample_data, sample_count, 1);
+
+ delete[] sample_data;
+}
+
+void MathSignal::generation_proc()
+{
+ uint32_t segment_id = 0;
+
+ // Don't do anything until we have a valid sample rate
+ do {
+ if (use_custom_sample_rate_)
+ data_->set_samplerate(custom_sample_rate_);
+ else
+ data_->set_samplerate(session_.get_samplerate());
+
+ if (data_->get_samplerate() == 1) {
+ unique_lock<mutex> gen_input_lock(input_mutex_);
+ gen_input_cond_.wait(gen_input_lock);
+ }
+ } while ((!gen_interrupt_) && (data_->get_samplerate() == 1));
+
+ if (gen_interrupt_)
+ return;
+
+ shared_ptr<Analog> analog = analog_data();
+
+ // Create initial analog segment
+ shared_ptr<AnalogSegment> output_segment =
+ make_shared<AnalogSegment>(*analog.get(), segment_id, analog->get_samplerate());
+ analog->push_segment(output_segment);
+
+ // Create analog samples
+ do {
+ const uint64_t input_sample_count = get_working_sample_count(segment_id);
+ const uint64_t output_sample_count = output_segment->get_sample_count();
+
+ const uint64_t samples_to_process =
+ (input_sample_count > output_sample_count) ?
+ (input_sample_count - output_sample_count) : 0;
+
+ // Process the samples if necessary...
+ if (samples_to_process > 0) {
+ const uint64_t chunk_sample_count = ChunkLength;
+
+ uint64_t processed_samples = 0;
+ do {
+ const uint64_t start_sample = output_sample_count + processed_samples;
+ const uint64_t sample_count =
+ min(samples_to_process - processed_samples, chunk_sample_count);
+
+ generate_samples(segment_id, start_sample, sample_count);
+ processed_samples += sample_count;
+
+ // Notify consumers of this signal's data
+ // TODO Does this work when a conversion is active?
+ samples_added(segment_id, start_sample, start_sample + processed_samples);
+ } while (!gen_interrupt_ && (processed_samples < samples_to_process));
+ }
+
+ if (samples_to_process == 0) {
+ if (segment_id < session_.get_highest_segment_id()) {
+ analog->analog_segments().back()->set_complete();
+
+ // Process next segment
+ segment_id++;
+
+ output_segment =
+ make_shared<AnalogSegment>(*analog.get(), segment_id, analog->get_samplerate());
+ analog->push_segment(output_segment);
+ } else {
+ // All segments have been processed, wait for more input
+ unique_lock<mutex> gen_input_lock(input_mutex_);
+ gen_input_cond_.wait(gen_input_lock);
+ }
+ }
+
+ } while (!gen_interrupt_);
+}
+
+signal_data* MathSignal::signal_from_name(const std::string& name)
+{
+ // Look up signal in the map and if it doesn't exist yet, add it for future use
+
+ auto element = input_signals_.find(name);
+
+ if (element != input_signals_.end()) {
+ return &(element->second);
+ } else {
+ const vector< shared_ptr<SignalBase> > signalbases = session_.signalbases();
+ const QString sig_name = QString::fromStdString(name);
+
+ for (const shared_ptr<SignalBase>& sb : signalbases)
+ if (sb->name() == sig_name)
+ return &(input_signals_.insert({name, signal_data(sb)}).first->second);
+ }
+
+ return nullptr;
+}
+
+void MathSignal::update_signal_sample(signal_data* sig_data, uint32_t segment_id, uint64_t sample_num)
+{
+ assert(sig_data);
+
+ // Update the value only if a different sample is requested
+ if (sig_data->sample_num == sample_num)
+ return;
+
+ assert(sig_data->sb);
+ const shared_ptr<pv::data::Analog> analog = sig_data->sb->analog_data();
+ assert(analog);
+
+ assert(segment_id < analog->analog_segments().size());
+
+ const shared_ptr<AnalogSegment> segment = analog->analog_segments().at(segment_id);
+
+ sig_data->sample_num = sample_num;
+ sig_data->sample_value = segment->get_sample(sample_num);
+
+ // We only have a reference if this signal is used as a scalar,
+ // if it's used by a function, it's null
+ if (sig_data->ref)
+ *(sig_data->ref) = sig_data->sample_value;
+}
+
+void MathSignal::on_capture_state_changed(int state)
+{
+ if (state == Session::Running)
+ begin_generation();
+
+ if (state == Session::Stopped) {
+ shared_ptr<Analog> analog = analog_data();
+ analog->analog_segments().back()->set_complete();
+ }
+}
+
+void MathSignal::on_data_received()
+{
+ gen_input_cond_.notify_one();
}
} // namespace data
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