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| ==generate sound by python ==
| | *:[[20131017：raw sound/image]] |
| <source lang="python">
| | *:[[20131104]] |
| import wave, struct
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| | |
| filename = "output.wav"
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| nframes=0
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| nchannels=1
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| sampwidth=2 # in bytes so 2=16bit, 1=8bit
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| framerate=44100
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| bufsize=2048
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| | |
| w = wave.open(filename, 'w')
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| w.setparams((nchannels, sampwidth, framerate, nframes, 'NONE', 'not compressed'))
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| | |
| max_amplitude = float(int((2 ** (sampwidth * 8)) / 2) - 1)
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| | |
| # split the samples into chunks (to reduce memory consumption and improve performance)
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| #for chunk in grouper(bufsize, samples):
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| # frames = ''.join(''.join(struct.pack('h', int(max_amplitude * sample)) for sample in channels) for channels in chunk if channels is not None)
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| # w.writeframesraw(frames)
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| | |
| freq = 440
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| # this means that FREQ times a second, we need to complete a cycle
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| # there are FRAMERATE samples per second
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| # so FRAMERATE / FREQ = CYCLE LENGTH
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| cycle = framerate / freq
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| | |
| | |
| data = ''
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| for i in range(10): #正负波重复的次数
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| for x in range(100):
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| data += struct.pack('h', int(0.5 * max_amplitude))
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| for x in range(100):
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| data += struct.pack('h', int(-0.5 * max_amplitude))
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| w.writeframesraw(data)
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| | |
| w.close()
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| </source>
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| | |
| == Generating "Raw" Images ==
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| {{:Raw image}}
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