Addings Lights to Process

process_lights.c

int process(jack_nframes_t nframes, void *arg) {
        sample_t *outBufferLeft = (sample_t *) jack_port_get_buffer(output_port_l, nframes);
        sample_t *outBufferRight = (sample_t *) jack_port_get_buffer(output_port_r, nframes);
        sample_t *inBufferLeft = (sample_t *) jack_port_get_buffer(input_port_l, nframes);
        sample_t *inBufferRight = (sample_t *) jack_port_get_buffer(input_port_r, nframes);

        // copy input audio to output
        memcpy(outBufferLeft, inBufferLeft, sizeof(sample_t) * nframes);
        memcpy(outBufferRight, inBufferRight, sizeof(sample_t) * nframes);

        // initialize empty array of values
        static double *totals = NULL;
        if (totals == NULL) {
                totals = malloc(sizeof(double) * 1024);
        }
        static double wholeTotal = 0;
        static size_t oldestIndex = 0;
        static size_t blueness = 0x66;

        // calculate an estimate for the volume of the data
        double total = 0;
        for (int i = 0; i < nframes; i++) {
                total += pow(inBufferLeft[i], 2);
                total += pow(inBufferRight[i], 2);
        }
        total /= FILTER_SAMPLES;

        bool beat = false;
        if (total * FILTER_SAMPLES > 1.3 * wholeTotal) {
                beat = true;
        }
        printf("w: %f", wholeTotal);
        printf("t: %f\n", total);

        wholeTotal -= totals[oldestIndex];
        totals[oldestIndex] = total;
        wholeTotal += totals[oldestIndex];
        oldestIndex = (oldestIndex + 1) % FILTER_SAMPLES;

        // print to the console based on the volume estimate
        size_t decay = 10;
        if (blueness >= decay) {
                s = blueness - decay;
        } else {
                blueness = 0;
        }
        if (beat) {
                blueness = 0x66;
        }

        APA102_Fill(strip, APA102_CreateFrame(31, 0x00, 0x00, blueness));

        // uncomment the following line for debugging
        //printf("\n%f", total);

        return 0;
}