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Update Audio FFT example.
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@ -1,22 +1,24 @@
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import image, audio, time, array, math, ulab as np
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from ulab import extras, numerical
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import image, audio, time
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from ulab import numpy as np
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from ulab import scipy as sp
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SIZE = 512//4
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pcm_buf = None
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raw_buf = None
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fb = image.Image(SIZE+50, SIZE, image.RGB565, copy_to_fb=True)
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audio.init(channels=2, frequency=16000, gain=24, highpass=0.9883)
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def audio_callback(buf):
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global pcm_buf
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if (pcm_buf == None):
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pcm_buf = np.array(array.array('h', buf))
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# NOTE: do Not call any function that allocates memory.
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global raw_buf
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if (raw_buf == None):
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raw_buf = buf
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# Start audio streaming
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audio.start_streaming(audio_callback)
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def draw_fft(img, fft_buf):
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fft_buf = (fft_buf / max(fft_buf)) * SIZE
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fft_buf = np.vector.log10(fft_buf + 1) * 20
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fft_buf = np.log10(fft_buf + 1) * 20
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color = (0xFF, 0x0F, 0x00)
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for i in range(0, SIZE):
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img.draw_line(i, SIZE, i, SIZE-int(fft_buf[i]), color, 1)
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@ -29,12 +31,13 @@ def draw_audio_bar(img, level, offset):
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fb.draw_rectangle(SIZE+offset, SIZE - ((i+1)*blk_size) + blk_space, 20, blk_size - blk_space, color, 1, True)
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while (True):
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if (pcm_buf != None):
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if (raw_buf):
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pcm_buf = np.frombuffer(raw_buf, dtype=np.int16)
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raw_buf = None
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fft_buf = sp.signal.spectrogram(pcm_buf[0::2])
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l_lvl = int((np.mean(abs(pcm_buf[1::2])) / 32768)*100)
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r_lvl = int((np.mean(abs(pcm_buf[0::2])) / 32768)*100)
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fb.clear()
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fft_buf = extras.spectrogram(pcm_buf[0::2])
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l_lvl = int((numerical.mean(abs(pcm_buf[1::2])) / 32768)*100)
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r_lvl = int((numerical.mean(abs(pcm_buf[0::2])) / 32768)*100)
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pcm_buf = None
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draw_fft(fb, fft_buf)
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draw_audio_bar(fb, l_lvl, 0)
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draw_audio_bar(fb, r_lvl, 25)
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