median.cpp

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#include "median.h"
 
namespace sensesp {
 
Median::Median(unsigned int sample_size, String config_path)
    : FloatTransform(config_path), sample_size_{sample_size} {
  load_configuration();
  buf_.reserve(sample_size_);
  buf_.clear();
}
 
void Median::set_input(float input, uint8_t inputChannel) {
  buf_.push_back(input);
  if (buf_.size() >= sample_size_) {
    // Its time to output a value
    sort(buf_.begin(), buf_.end());
    int mid = sample_size_ / 2;
    output = buf_[mid];
    buf_.clear();
    notify();
  }
}
 
void Median::get_configuration(JsonObject& root) {
  root["sample_size"] = sample_size_;
}
 
static const char SCHEMA[] PROGMEM = R"({
    "type": "object",
    "properties": {
        "sample_size": { "title": "Sample size", "description": "Number of samples to take before outputing a value", "type": "integer" }
    }
  })";
 
String Median::get_config_schema() { return FPSTR(SCHEMA); }
 
bool Median::set_configuration(const JsonObject& config) {
  String expected[] = {"sample_size"};
  for (auto str : expected) {
    if (!config.containsKey(str)) {
      return false;
    }
  }
  unsigned int sample_size_new = config["sample_size"];
  if (sample_size_ != sample_size_new) {
    sample_size_ = sample_size_new;
    buf_.reserve(sample_size_);
    buf_.clear();
  }
  return true;
}
 
}  // namespace sensesp