Make the final makeup gain adjustment a little faster; 100 seconds was probably a...

[nageru] / audio_mixer.cpp

diff --git a/audio_mixer.cpp b/audio_mixer.cpp
index 3629d7414479de5f6bf308d5f59d3b9ee1f71755..2544ad1deef84635cf5fd28d487dd78ba7293201 100644 (file)
--- a/audio_mixer.cpp
+++ b/audio_mixer.cpp
@@ -227,7 +227,7 @@ vector<float> AudioMixer::get_output(double pts, unsigned num_samples, Resamplin
        // something we get out per-sample.
        //
        // Note that there's a feedback loop here, so we choose a very slow filter
-       // (half-time of 100 seconds).
+       // (half-time of 30 seconds).
        double target_loudness_factor, alpha;
        double loudness_lu = loudness_lufs - ref_level_lufs;
        double current_makeup_lu = to_db(final_makeup_gain);
@@ -241,7 +241,7 @@ vector<float> AudioMixer::get_output(double pts, unsigned num_samples, Resamplin
        } else {
                // Formula adapted from
                // https://en.wikipedia.org/wiki/Low-pass_filter#Simple_infinite_impulse_response_filter.
-               const double half_time_s = 100.0;
+               const double half_time_s = 30.0;
                const double fc_mul_2pi_delta_t = 1.0 / (half_time_s * OUTPUT_FREQUENCY);
                alpha = fc_mul_2pi_delta_t / (fc_mul_2pi_delta_t + 1.0);
        }