leds.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "bass.h"

int write_int(char const* path, int value) {

    int fd, amt, bytes;
    char buffer[20];

    /* Int output to path */
    fd = open(path, O_RDWR);
    if (fd >= 0) {
        bytes = snprintf(buffer, sizeof(buffer), "%d\n", value);
        amt = write(fd, buffer, bytes);
        close(fd);
        return (amt == -1 ? -errno : 0);
    }
    else {
        printf("write_int failed to open %s\n", path);
        return -errno;
    }
}

void led_brightness(uint8_t r, uint8_t g, uint8_t b)
{
	write_int("/sys/class/leds/LED1_R/brightness", r);
	write_int("/sys/class/leds/LED2_R/brightness", r);
	write_int("/sys/class/leds/LED3_R/brightness", r);
	write_int("/sys/class/leds/LED1_G/brightness", g);
	write_int("/sys/class/leds/LED2_G/brightness", g);
	write_int("/sys/class/leds/LED3_G/brightness", g);
	write_int("/sys/class/leds/LED1_B/brightness", b);
	write_int("/sys/class/leds/LED2_B/brightness", b);
	write_int("/sys/class/leds/LED3_B/brightness", b);
}

// Board: set led colors
void led_color(uint8_t r, uint8_t g, uint8_t b)
{
	write_int("/sys/class/leds/LED1_R/led_current", r);
	write_int("/sys/class/leds/LED2_R/led_current", r);
	write_int("/sys/class/leds/LED3_R/led_current", r);
	write_int("/sys/class/leds/LED1_G/led_current", g);
	write_int("/sys/class/leds/LED2_G/led_current", g);
	write_int("/sys/class/leds/LED3_G/led_current", g);
	write_int("/sys/class/leds/LED1_B/led_current", b);
	write_int("/sys/class/leds/LED2_B/led_current", b);
	write_int("/sys/class/leds/LED3_B/led_current", b);
}

void led_brightness_n (int n, uint8_t r, uint8_t g, uint8_t b)
{
	switch (n)
	{
		case 1 :
			write_int("/sys/class/leds/LED1_R/brightness", r);
			write_int("/sys/class/leds/LED1_G/brightness", g);
			write_int("/sys/class/leds/LED1_B/brightness", b);
			break;

		case 2 :
			write_int("/sys/class/leds/LED2_R/brightness", r);
			write_int("/sys/class/leds/LED2_G/brightness", g);
			write_int("/sys/class/leds/LED2_B/brightness", b);
			break;

		case 3 :
			write_int("/sys/class/leds/LED3_R/brightness", r);
			write_int("/sys/class/leds/LED3_G/brightness", g);
			write_int("/sys/class/leds/LED3_B/brightness", b);
			break;

		default:
			printf ("R u mad bro? WTF?\n");
			break;
	}
}

void led_color_n (int n, uint8_t r, uint8_t g, uint8_t b)
{
	switch (n)
	{
		case 1 :
			write_int("/sys/class/leds/LED1_R/led_current", r);
			write_int("/sys/class/leds/LED1_G/led_current", g);
			write_int("/sys/class/leds/LED1_B/led_current", b);
			break;

		case 2 :
			write_int("/sys/class/leds/LED2_R/led_current", r);
			write_int("/sys/class/leds/LED2_G/led_current", g);
			write_int("/sys/class/leds/LED2_B/led_current", b);
			break;

		case 3 :
			write_int("/sys/class/leds/LED3_R/led_current", r);
			write_int("/sys/class/leds/LED3_G/led_current", g);
			write_int("/sys/class/leds/LED3_B/led_current", b);
			break;

		default:
			printf ("R u mad bro? WTF?\n");
			break;
	}
}


int main(int argc, char* argv[])
{
	printf("I love Sony LEDs! They're cool!\n");

	printf("Starting up the BASS library...\n");

	if (!BASS_Init(-1, 44100, 0, 0, 0))
	{
		printf ("BASS could not start up, the code is %d\n", BASS_ErrorGetCode());
		exit(-1);
	}

	printf ("Creating BASS Stream...\n");

	int stream = BASS_StreamCreateFile(0, "/sdcard/1.mp3", 0, 0, 0);

	if (BASS_ErrorGetCode() == 0)
		printf ("It seems that we can play a BASS stream! Yay!\n");

	BASS_ChannelPlay(stream, 0);

	if (BASS_ErrorGetCode() == 0)
		printf ("Does it play? Say yes, please! *.*\n");

	printf("Resetting the LEDs. I will wait for 3s, stop me if reset is all what you need!\n");
	led_brightness(255, 255, 255);
	led_color(0, 0, 0);

	// usleep(3000000);

	printf ("OK, let it go!\n");



	uint8_t levels[9];
	float fft[128]; // fft data buffer

	float tmp;

	while (BASS_ChannelIsActive(stream) == BASS_ACTIVE_PLAYING)
	{
		
		
		BASS_ChannelGetData(stream, fft, BASS_DATA_FFT256);

		for (int i = 0; i < 64; i += 7)
		{
			tmp = 0;
			for (int j = i; j < i+7; j++)
				tmp += fft[j];

			tmp = tmp / 7;

			levels[(int)(i / 7)] = (uint8_t)(tmp*255);
		}

		led_color_n(1, levels[0], levels[1], levels[2]);
		led_color_n(2, levels[3], levels[4], levels[5]);
		led_color_n(3, levels[6], levels[7], levels[8]);

		usleep(5);
	}

	led_brightness(0, 0, 0);
	led_color(0, 0, 0);

	BASS_Free();

	return 0;
}