29 lines
843 B
Factor
29 lines
843 B
Factor
! (c)2009 Joe Groff bsd license
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USING: accessors alien.c-types combinators endian io kernel
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math sequences ;
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IN: audio.chunked-file
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ERROR: invalid-audio-file ;
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: ensured-read ( count -- output/f )
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[ read ] keep over length = [ drop f ] unless ;
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: ensured-read* ( count -- output )
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ensured-read [ invalid-audio-file ] unless* ;
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: read-chunk ( -- byte-array/f )
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4 ensured-read [ 4 ensured-read* dup endian> ensured-read* 3append ] [ f ] if* ;
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: id= ( chunk id -- ? )
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[ 4 head ] dip sequence= ; inline
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: convert-data-endian ( audio -- audio )
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dup sample-bits>> {
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{ 16 [ [ 2 seq>native-endianness ] change-data ] }
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{ 32 [ [ 4 seq>native-endianness ] change-data ] }
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[ drop ]
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} case ;
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: check-chunk ( chunk id class -- ? )
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heap-size [ id= ] [ [ length ] dip >= ] bi-curry* bi and ; inline
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