rgbtest.py

import alsaaudio as aa
import wave
from struct import unpack
import numpy as np
from rgbmatrix import RGBMatrix, RGBMatrixOptions, graphics

wavfile = wave.open('test.wav')
sample_rate = wavfile.getframerate()
no_channels = wavfile.getnchannels()

options = RGBMatrixOptions()
options.rows = 64
options.cols = 64
options.chain_length = 1
options.parallel = 1
options.hardware_mapping = 'adafruit-hat'
Dmatrix = RGBMatrix(options=options)
Dmatrix.Clear()

chunk = 4096

matrix = [0] * 64

weighting = [0]*64
weighting[0] = 2
power = []

for i in range(63):
	if i%2==0:
		weighting[i+1] = 2**(2+i)
	else:
		weighting[i+1] = 2**(1+i)

output = aa.PCM(aa.PCM_PLAYBACK,aa.PCM_NORMAL)
output.setchannels(2)
output.setrate(sample_rate)
output.setformat(aa.PCM_FORMAT_S16_LE)
output.setperiodsize(chunk)

def piff(val):
	return int(2*chunk*val/sample_rate)
	
def calculate_levels(data, chunk, sample_rate):
	data = unpack("%dh"%(len(data)/2),data)
	data = np.array(data,dtype='h')
	fourier = np.fft.rfft(data)
	fourier = np.delete(fourier,len(fourier)-1)
	power = np.log10(np.abs(fourier))**2
	power = np.reshape(power,(64,chunk/64))
	matrix = np.int_(np.average(power,axis=1))
	return matrix

data = wavfile.readframes(chunk)
while data != '':
	output.write(data)
	matrix = calculate_levels(data,chunk,sample_rate)
	#print(matrix)
	Dmatrix.Clear()
	for y in range(0,64):
		for x in range(matrix[y]):
			x *=2
			if x < 32:
				Dmatrix.SetPixel(y,x,0,200,0)
				Dmatrix.SetPixel(y,x-1,0,200,0)
			elif x < 50:
				Dmatrix.SetPixel(y,x,150,150,0)
				Dmatrix.SetPixel(y,x-1,150,150,0)
			else:
				Dmatrix.SetPixel(y,x,200,0,0)
				Dmatrix.SetPixel(y,x-1,200,0,0)
	data = wavfile.readframes(chunk)