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https://github.com/openmv/openmv.git
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* Use a configurable number of PCM buffers in a queue to avoid overflows. * Add option to configure whether to use pendsv or mp_scheduler for Python callbacks. * Streaming can be started without a callback and get_buffer() returns a single buffer from the queue. * Add precomputed LUT for lib OpenPDM stored in flash (saves about 500uS per conversion). * Overflow detection and configurable abort on overflow. * Remove fixed DMA channel.
61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
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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CHANNELS = 1
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FREQUENCY = 32000
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N_SAMPLES = 32 if FREQUENCY == 16000 else 64
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SCALE = 1
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SIZE = (N_SAMPLES * SCALE) // CHANNELS
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raw_buf = None
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fb = image.Image(SIZE+(50*SCALE), SIZE, image.RGB565, copy_to_fb=True)
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audio.init(channels=CHANNELS, frequency=FREQUENCY, gain_db=16, overflow=False)
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def audio_callback(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.log10(fft_buf + 1) * 20
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color = (0xFF, 0x0F, 0x00)
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for i in range(0, len(fft_buf)):
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img.draw_line(i*SCALE, SIZE, i*SCALE, SIZE-int(fft_buf[i]) * SCALE, color, SCALE)
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def draw_audio_bar(img, level, offset):
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blk_size = (SIZE//10)
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color = (0xFF, 0x00, 0xF0)
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blk_space = (blk_size//4)
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for i in range(0, int(round(level/10))):
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fb.draw_rectangle(SIZE+offset, SIZE - ((i+1)*blk_size) + blk_space, 20 * SCALE, blk_size - blk_space, color, 1, True)
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while (True):
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if (raw_buf != None):
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pcm_buf = np.frombuffer(raw_buf, dtype=np.int16)
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raw_buf = None
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if CHANNELS == 1:
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fft_buf = sp.signal.spectrogram(pcm_buf)
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l_lvl = int((np.mean(abs(pcm_buf[1::2])) / 32768)*100)
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else:
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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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draw_fft(fb, fft_buf)
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draw_audio_bar(fb, l_lvl, 0)
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draw_audio_bar(fb, l_lvl, 25*SCALE)
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if CHANNELS == 2:
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draw_audio_bar(fb, r_lvl, 25 * SCALE)
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fb.flush()
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# Stop streaming
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audio.stop_streaming()
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