has_beat.c

bool has_beat(sample_t *audio_left, sample_t *audio_right, jack_nframes_t num_samples) {
        static movingAverage_t *moving_avg = NULL;
        if (moving_avg == NULL) {
                moving_avg = movingAverage_new(FILTER_SAMPLES);
        }

        // beat detected if volume much higher than moving avg
        double volume = calc_volume(audio_left, audio_right, num_samples);
        bool beat_detected =
                volume * FILTER_SAMPLES > BEAT_FACTOR * moving_avg->average;
        movingAverage_update(moving_avg, volume);

        return beat_detected;
}