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Merge pull request #1617 from FearlessTobi/fix-stretch-delay

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time_stretch: Switch to values of Citra
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bunnei 2018-10-29 19:09:30 -04:00 committed by GitHub
commit f1cb425d92
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1 changed files with 3 additions and 3 deletions
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6
src/audio_core/time_stretch.cpp
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@ -32,10 +32,10 @@ std::size_t TimeStretcher::Process(const s16* in, std::size_t num_in, s16* out,
// We were given actual_samples number of samples, and num_samples were requested from us. // We were given actual_samples number of samples, and num_samples were requested from us.
double current_ratio = static_cast<double>(num_in) / static_cast<double>(num_out); double current_ratio = static_cast<double>(num_in) / static_cast<double>(num_out);
const double max_latency = 1.0; // seconds const double max_latency = 0.25; // seconds
const double max_backlog = m_sample_rate * max_latency; const double max_backlog = m_sample_rate * max_latency;
const double backlog_fullness = m_sound_touch.numSamples() / max_backlog; const double backlog_fullness = m_sound_touch.numSamples() / max_backlog;
if (backlog_fullness > 5.0) { if (backlog_fullness > 4.0) {
// Too many samples in backlog: Don't push anymore on // Too many samples in backlog: Don't push anymore on
num_in = 0; num_in = 0;
} }
@ -49,7 +49,7 @@ std::size_t TimeStretcher::Process(const s16* in, std::size_t num_in, s16* out,
// This low-pass filter smoothes out variance in the calculated stretch ratio. // This low-pass filter smoothes out variance in the calculated stretch ratio.
// The time-scale determines how responsive this filter is. // The time-scale determines how responsive this filter is.
constexpr double lpf_time_scale = 2.0; // seconds constexpr double lpf_time_scale = 0.712; // seconds
const double lpf_gain = 1.0 - std::exp(-time_delta / lpf_time_scale); const double lpf_gain = 1.0 - std::exp(-time_delta / lpf_time_scale);
m_stretch_ratio += lpf_gain * (current_ratio - m_stretch_ratio); m_stretch_ratio += lpf_gain * (current_ratio - m_stretch_ratio);