Package echonest :: Package support :: Package midi :: Module DataTypeConverters

Module DataTypeConverters

Functions

getNibbles(byte)
Returns hi and lo bits in a byte as a tuple >>> getNibbles(142) (8, 14)

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setNibbles(hiNibble, loNibble)
Returns byte with value set according to hi and lo bits Asserts hiNibble and loNibble in range(16) >>> setNibbles(8, 14) 142

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readBew(value)
Reads string as big endian word, (asserts len(value) in [1,2,4]) >>> readBew('aáâã') 1642193635L >>> readBew('aá') 25057

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writeBew(value, length)
Write int as big endian formatted string, (asserts length in [1,2,4]) Difficult to print the result in doctest, so I do a simple roundabout test.

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readVar(value)
Converts varlength format to integer.

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varLen(value)
Returns the the number of bytes an integer will be when converted to varlength

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writeVar(value)
Converts an integer to varlength format

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to_n_bits(value, length=1, nbits=7)
returns the integer value as a sequence of nbits bytes

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toBytes(value)
Turns a string into a list of byte values

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fromBytes(value)
Turns a list of bytes into a string

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Function Details

[hide private]

getNibbles(byte)

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Returns hi and lo bits in a byte as a tuple
>>> getNibbles(142)
(8, 14)

Asserts byte value in byte range
>>> getNibbles(256)
Traceback (most recent call last):
    ...
ValueError: Byte value out of range 0-255: 256

writeBew(value, length)

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Write int as big endian formatted string, (asserts length in [1,2,4]) Difficult to print the result in doctest, so I do a simple roundabout test. >>> readBew(writeBew(25057, 2)) 25057 >>> readBew(writeBew(1642193635L, 4)) 1642193635L

readVar(value)

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Converts varlength format to integer. Just pass it 0 or more chars that might be a varlen and it will only use the relevant chars. use varLen(readVar(value)) to see how many bytes the integer value takes. asserts len(value) >= 0 >>> readVar('€@') 64 >>> readVar('áâãa') 205042145