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PEP8 radio/util/codecs.py
Fix white space
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1 changed files with 20 additions and 15 deletions
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@ -2,52 +2,57 @@
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from __future__ import print_function
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SIGN_BIT = (0x80) # Sign bit for a A-law byte.
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QUANT_MASK = (0xf) # Quantization field mask.
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SEG_SHIFT = (4) # Left shift for segment number.
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SEG_MASK = (0x70) # Segment field mask.
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BIAS = (0x84) # Bias for linear code.
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SIGN_BIT = (0x80) # Sign bit for a A-law byte.
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QUANT_MASK = (0xf) # Quantization field mask.
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SEG_SHIFT = (4) # Left shift for segment number.
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SEG_MASK = (0x70) # Segment field mask.
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BIAS = (0x84) # Bias for linear code.
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def alaw2linear(a_val):
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a_val ^= 0x55
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t = a_val & QUANT_MASK
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seg = (a_val & SEG_MASK) >> SEG_SHIFT
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if (seg):
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t = (t + t + 1 + 32) << (seg + 2)
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else:
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t = (t + t + 1 ) << 3
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t = (t + t + 1) << 3
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if a_val & SIGN_BIT:
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return t
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else:
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return -t
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def ulaw2linear(u_val):
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def ulaw2linear(u_val):
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# Complement to obtain normal u-law value.
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u_val = ~u_val
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# Extract and bias the quantization bits. Then
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# shift up by the segment number and subtract out the bias.
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t = ((u_val & QUANT_MASK) << 3) + BIAS
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t <<= (u_val & SEG_MASK) >> SEG_SHIFT
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if u_val & SIGN_BIT:
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return (BIAS - t)
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else:
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return (t - BIAS)
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def pcmTable(fn):
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result = []
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for i in range(256):
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result.append(fn(i))
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return result
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def tableToString(name, table):
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result = 'const int16_t ' + name + '[256] = { '
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result += ', '.join([str(i) for i in table])
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def tableToString(name, table):
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result = 'const int16_t ' + name + '[256] = { '
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result += ', '.join(str(i) for i in table)
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result += ' };'
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return result
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print(tableToString('alawTable', pcmTable(alaw2linear)))
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print(tableToString('ulawTable', pcmTable(ulaw2linear)))
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