steve
/
factor
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

make audio.wav endian-neutral

db4
Joe Groff 2010-01-19 11:24:13 -08:00
parent beb0e7ae5b
commit 9c95b884dd
1 changed files with 17 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
extra/audio/wav/wav.factor
View File

@ -1,4 +1,4 @@
USING: alien.c-types alien.syntax audio combinators
USING: alien.c-types alien.syntax audio combinators endian
combinators.short-circuit io io.binary io.encodings.binary
io.files io.streams.byte-array kernel locals math
sequences alien alien.data classes.struct accessors ;
@ -30,12 +30,12 @@ STRUCT: wav-data-chunk
{ header riff-chunk-header }
{ body uchar[0] } ;
ERROR: invalid-wav-file ;
ERROR: invalid-audio-file ;
: ensured-read ( count -- output/f )
[ read ] keep over length = [ drop f ] unless ;
: ensured-read* ( count -- output )
ensured-read [ invalid-wav-file ] unless* ;
ensured-read [ invalid-audio-file ] unless* ;
: read-chunk ( -- byte-array/f )
4 ensured-read [ 4 ensured-read* dup le> ensured-read* 3append ] [ f ] if* ;
@ -55,14 +55,23 @@ ERROR: invalid-wav-file ;
{ [ dup FMT-MAGIC wav-fmt-chunk check-chunk ] [ wav-fmt-chunk memory>struct fmt! ] }
{ [ dup DATA-MAGIC wav-data-chunk check-chunk ] [ wav-data-chunk memory>struct data! ] }
} cond ] while drop
fmt data 2dup and [ invalid-wav-file ] unless ;
fmt data 2dup and [ invalid-audio-file ] unless ;
: verify-wav ( chunk -- )
{
[ RIFF-MAGIC id= ]
[ riff-chunk memory>struct format>> 4 memory>byte-array WAVE-MAGIC id= ]
} 1&&
[ invalid-wav-file ] unless ;
[ invalid-audio-file ] unless ;
: convert-data-endian ( audio -- audio )
little-endian [
dup sample-bits>> {
{ 16 [ [ 2 seq>native-endianness ] change-data ] }
{ 32 [ [ 4 seq>native-endianness ] change-data ] }
[ drop ]
} case
] with-endianness ;
: (read-wav) ( -- audio )
read-wav-chunks
@ -73,7 +82,9 @@ ERROR: invalid-wav-file ;
] [
[ header>> size>> 4 memory>byte-array le> dup ]
[ body>> >c-ptr ] bi swap memory>byte-array
] bi* <audio> ;
] bi*
<audio>
convert-data-endian ;
: read-wav ( filename -- audio )
binary [