working decoder

flac/decoder/decoder.factor

@@ -200,7 +200,7 @@ SYMBOL: current-flac-output
     read-flac-subframe-wasted-bits
     flac-subframe-header boa ;
 
-: calculate-sample-depth ( bps channel-assignment wasted-bits channel -- sample-depth )
+: calculate-sample-depth ( bps wasted-bits channel-assignment channel -- sample-depth )
     [ - ] 2dip swap
     {
         { channel-assignment-left  [ 1 = [ 1 ] [ 0 ] if ] }
@@ -238,7 +238,7 @@ SYMBOL: current-flac-output
     frame-header bits-per-sample>> :> bps
     frame-header blocksize>> :> blocksize
     frame-header channel-assignment>> :> channel-assignment
-    bps channel-assignment wasted-bits channel calculate-sample-depth :> sample-depth
+    bps wasted-bits channel-assignment channel calculate-sample-depth :> sample-depth
 
     subframe-type
     {

flac/flac.factor

@@ -0,0 +1,49 @@
+USING: kernel audio.wav io io.files io.encodings.ascii io.encodings.binary io.encodings.string endian accessors math sequences ;
+USING: flac.decoder flac.stream flac.metadata ;
+
+USING: specialized-arrays alien.c-types prettyprint io.encodings.utf8 ;
+
+IN: flac
+
+:: wav-header ( stream-info -- byte-array )
+    RIFF-MAGIC ascii encode
+    stream-info samples>> stream-info channels>> stream-info bits-per-sample>> 8 /i * * 36 + 4 >le
+    WAVE-MAGIC ascii encode
+    FMT-MAGIC ascii encode
+    16 4 >le
+    1 2 >le
+    stream-info channels>> 2 >le
+    stream-info sample-rate>> 4 >le
+    stream-info sample-rate>> stream-info channels>> stream-info bits-per-sample>> 8 /i * * 4 >le
+    stream-info channels>> stream-info bits-per-sample>> 8 /i * 2 >le
+    stream-info bits-per-sample>> 2 >le
+    DATA-MAGIC ascii encode
+    stream-info samples>> stream-info channels>> stream-info bits-per-sample>> 8 /i * * 4 >le
+    '{ _ _ _ _ _ _ _ _ _ _ _ _ _ } B{ } concat-as ;
+
+:: write-frame ( sample-depth channels blocksize samples -- )
+    sample-depth 8 /i :> sample-bytes
+    sample-depth 8 = [ 128 ] [ 0 ] if :> addend
+    blocksize <iota> [| block |
+        channels <iota> [| channel |
+                         block channel samples nth nth addend + sample-bytes >le write
+        ] each
+    ] each ;
+
+! TODO: actually write good code
+: decode-file ( flac-file -- )
+    [
+        "/home/steve/FACTOR.wav" binary [
+            read-stream-info/seek-data
+            dup
+            [ wav-header write ]
+            [ samples>> ] bi
+            swap <repetition>
+            [
+                [ [ bits-per-sample>> ] [ channels>> ] bi ]
+                [ read-flac-frame ] bi
+                [ header>> blocksize>> ] [ samples>> ] bi
+                write-frame
+            ] each
+        ] with-file-writer
+    ] with-flac-file-reader ;

flac/stream/stream.factor

@@ -1,14 +1,13 @@
-USING: kernel namespaces accessors sequences destructors io.files io.encodings.binary math math.functions math.bitwise ;
+USING: kernel namespaces accessors sequences destructors io io.files io.encodings.binary math math.functions math.bitwise ;
 FROM: flac.format => FLAC-MAGIC not-a-flac-stream ;
 QUALIFIED: bitstreams
 QUALIFIED: io
 
-USING: prettyprint ;
 IN: flac.stream
 
 SYMBOL: flac-input-stream
 
-CONSTANT: default-bitreader-capacity 65536
+CONSTANT: default-bitreader-capacity 6553600
 
 TUPLE: flac-stream-reader stream bitstream ;
 
@@ -25,6 +24,14 @@ M: flac-stream-reader dispose stream>> dispose ;
         dup bytes>> swap [ prepend ] dip swap >>bytes drop
     ] while flac-input-stream get bitstream>> bitstreams:read ;
 
+: flac-seek ( n -- )
+    [ dup flac-input-stream get bitstream>> bitstreams:enough-bits? not ]
+    [
+        flac-input-stream get
+        [ stream>> default-bitreader-capacity swap io:stream-read ] [ bitstream>> ] bi
+        dup bytes>> swap [ prepend ] dip swap >>bytes drop
+    ] while flac-input-stream get bitstream>> bitstreams:seek ;
+
 : flac-align-to-byte ( -- )
     8 flac-input-stream get bitstream>> bitstreams:align ;