#ifndef ARDOUR_DSP_LOAD_CALCULATOR_H
#define ARDOUR_DSP_LOAD_CALCULATOR_H
+#include <stdlib.h>
#include <stdint.h>
#include <cassert>
#include <algorithm>
}
+ void set_max_time(double samplerate, uint32_t period_size) {
+ m_max_time_us = period_size * 1e6 / samplerate;
+ }
+
void set_max_time_us(uint64_t max_time_us) {
assert(max_time_us != 0);
m_max_time_us = max_time_us;
*/
if (m_start_timestamp_us < 0 || m_stop_timestamp_us < 0 ||
m_start_timestamp_us > m_stop_timestamp_us ||
- elapsed_time_us() > max_timer_error()) {
+ elapsed_time_us() > max_timer_error_us()) {
return;
}
- if (elapsed_time_us() > m_max_time_us) {
- m_dsp_load = 1.0f;
+#ifndef NDEBUG
+ const bool calc_avg_load = NULL != getenv("AVGLOAD");
+#else
+ const bool calc_avg_load = false;
+#endif
+
+ const float load = (float) elapsed_time_us() / (float)m_max_time_us;
+ if ((calc_avg_load && load > .95f) || (!calc_avg_load && (load > m_dsp_load || load > 1.f))) {
+ m_dsp_load = load;
} else {
- const float load = elapsed_time_us() / (float)m_max_time_us;
- if (load > m_dsp_load) {
- m_dsp_load = load;
- } else {
- const float alpha = 0.2f * (m_max_time_us * 1e-6f);
- m_dsp_load = m_dsp_load + alpha * (load - m_dsp_load) + 1e-12;
- }
+ const float alpha = 0.2f * (m_max_time_us * 1e-6f);
+ m_dsp_load = std::min (1.f, m_dsp_load);
+ m_dsp_load += alpha * (load - m_dsp_load) + 1e-12;
}
}
*/
float get_dsp_load() const
{
- if (m_dsp_load > m_max_time_us) {
- return 1.0f;
- }
- if (m_dsp_load < 0.0f) {
- return 0.0f;
- }
+ assert (m_dsp_load >= 0.f); // since stop > start is assured this cannot happen.
+ return std::min (1.f, m_dsp_load);
+ }
+
+ /**
+ * @return an unbound value representing the percentage of time spent between
+ * start and stop in proportion to the max expected time in microseconds(us).
+ * This is useful for cases to estimate overload (e.g. Dummy backend)
+ */
+ float get_dsp_load_unbound() const
+ {
+ assert (m_dsp_load >= 0.f);
return m_dsp_load;
}
-private: // methods
- int64_t max_timer_error () { return 4 * m_max_time_us; }
+ /**
+ * The maximum error in timestamp values that will be tolerated before the
+ * current dsp load sample will be ignored
+ */
+ int64_t max_timer_error_us() { return 4 * m_max_time_us; }
private: // data
int64_t m_max_time_us;