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ensure wav chunks are as big as they ought to be

db4
Joe Groff 2009-04-29 08:38:01 -05:00
parent 2741b3739d
commit aa3025ce23
1 changed files with 12 additions and 5 deletions
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17
extra/audio/wav/wav.factor
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@ -1,6 +1,7 @@
USING: alien.c-types alien.syntax audio combinators
combinators.short-circuit io io.binary io.encodings.binary
io.files io.streams.byte-array kernel locals sequences ;
io.files io.streams.byte-array kernel locals math
sequences ;
IN: audio.wav
CONSTANT: RIFF-MAGIC "RIFF"
@ -46,19 +47,25 @@ ERROR: invalid-wav-file ;
"riff-chunk" heap-size ensured-read* ;
: id= ( chunk id -- ? )
[ 4 memory>byte-array ] dip sequence= ;
[ 4 head ] dip sequence= ;
: check-chunk ( chunk id min-size -- ? )
[ id= ] [ [ length ] dip >= ] bi-curry* bi and ;
:: read-wav-chunks ( -- fmt data )
f :> fmt! f :> data!
[ { [ fmt data and not ] [ read-chunk ] } 0&& dup ]
[ {
{ [ dup FMT-MAGIC id= ] [ fmt! ] }
{ [ dup DATA-MAGIC id= ] [ data! ] }
{ [ dup FMT-MAGIC "wav-fmt-chunk" heap-size check-chunk ] [ fmt! ] }
{ [ dup DATA-MAGIC "wav-data-chunk" heap-size check-chunk ] [ data! ] }
} cond ] while drop
fmt data ;
: verify-wav ( chunk -- )
{ [ RIFF-MAGIC id= ] [ riff-chunk-format WAVE-MAGIC id= ] } 1&&
{
[ RIFF-MAGIC id= ]
[ riff-chunk-format 4 memory>byte-array WAVE-MAGIC id= ]
} 1&&
[ invalid-wav-file ] unless ;
: (read-wav) ( -- audio )