diff options
| -rw-r--r-- | Userland/Libraries/LibAudio/Sample.h | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/Userland/Libraries/LibAudio/Sample.h b/Userland/Libraries/LibAudio/Sample.h index 23faf6244a..50e3c84907 100644 --- a/Userland/Libraries/LibAudio/Sample.h +++ b/Userland/Libraries/LibAudio/Sample.h @@ -90,18 +90,22 @@ struct Sample { return new_frame; } - ALWAYS_INLINE Sample& log_pan(double const pan) + // Constant power panning + ALWAYS_INLINE Sample& pan(double const position) { - left *= linear_to_log(min(pan * -1 + 1.0, 1.0)); - right *= linear_to_log(min(pan + 1.0, 1.0)); + double const pi_over_2 = AK::Pi<double> * 0.5; + double const root_over_2 = AK::sqrt(2.0) * 0.5; + double const angle = position * pi_over_2 * 0.5; + left *= root_over_2 * (AK::cos(angle) - AK::sin(angle)); + right *= root_over_2 * (AK::cos(angle) + AK::sin(angle)); return *this; } - ALWAYS_INLINE Sample log_pan(double const pan) const + ALWAYS_INLINE Sample panned(double const position) const { - Sample new_frame { left, right }; - new_frame.log_pan(pan); - return new_frame; + Sample new_sample { left, right }; + new_sample.pan(position); + return new_sample; } constexpr Sample& operator*=(double const mult) |