ardour/livetrax
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Optimize DSP-load calculation, pre-calculate fall-off once

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This commit is contained in:
Robin Gareus 2019-02-14 00:04:29 +01:00
parent d03574987c
commit edc34b8d05
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 5 additions and 2 deletions
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7
libs/ardour/ardour/dsp_load_calculator.h
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@ -32,6 +32,7 @@ public:
: m_max_time_us(0)
, m_start_timestamp_us(0)
, m_stop_timestamp_us(0)
, m_alpha(0)
, m_dsp_load(0)
{
@ -39,11 +40,13 @@ public:
void set_max_time(double samplerate, uint32_t period_size) {
m_max_time_us = period_size * 1e6 / samplerate;
m_alpha = 0.2f * (m_max_time_us * 1e-6f);
}
void set_max_time_us(uint64_t max_time_us) {
assert(max_time_us != 0);
m_max_time_us = max_time_us;
m_alpha = 0.2f * (m_max_time_us * 1e-6f);
}
int64_t get_max_time_us() const { return m_max_time_us; }
@ -79,9 +82,8 @@ public:
if ((calc_avg_load && load > .95f) || (!calc_avg_load && (load > m_dsp_load || load > 1.f))) {
m_dsp_load = load;
} else {
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;
m_dsp_load += m_alpha * (load - m_dsp_load) + 1e-12;
}
}
@ -122,6 +124,7 @@ private: // data
int64_t m_max_time_us;
int64_t m_start_timestamp_us;
int64_t m_stop_timestamp_us;
float m_alpha;
float m_dsp_load;
};