more wip
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c91134d0ba
commit
1b67ebac16
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@ -17,6 +17,7 @@ GENERIC: align-to-byte ( flac-stream-reader -- )
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: <flac-stream-reader> ( path -- flac-stream-reader )
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binary <file-reader> B{ } bitstreams:<msb0-bit-reader> flac-stream-reader boa ;
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M: flac-stream-reader dispose stream>> dispose ;
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: flac-align-to-byte ( -- )
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@ -35,5 +36,5 @@ M: flac-stream-reader dispose stream>> dispose ;
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: with-flac-stream-reader ( flac-bitstream quot -- )
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[ with-flac-stream-reader* ] curry with-disposal ; inline
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: with-flac-file-reader ( filename quote -- )
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: with-flac-file-reader ( filename quot -- )
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[ <flac-stream-reader> ] dip with-flac-stream-reader ; inline
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@ -23,38 +23,14 @@ ERROR: invalid-subframe-sync ;
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: 1111110x? ( n -- ? ) [ 0xfc mask? ] [ 0x02 mask? not ] bi and ;
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: 11111110? ( n -- ? ) [ 0xfe mask? ] [ 0x01 mask? not ] bi and ;
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: remaining-bytes ( n -- n )
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{
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{ [ 110xxxxx? ] [ 1 ] }
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{ [ 1110xxxx? ] [ 2 ] }
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{ [ 11110xxx? ] [ 3 ] }
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{ [ 111110xx? ] [ 4 ] }
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{ [ 1111110x? ] [ 5 ] }
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{ [ 11111110? ] [ 6 ] }
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} cond-case ;
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! :: decode-utf8-uint ( frame-length bitstream -- n )
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! frame-length 7 -
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! bitstream read-bit
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! frame-length <iota> [
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! drop
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! 2 bitstream read-bit drop
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! 6 shift 6 bitstream read-bit bitor
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! ] each ;
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: read-utf8-uint ( -- n )
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8 flac-read-uint dup
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[ 0b11000000 <= ]
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[
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8 flac-read-uint drop
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1 shift 0xff bitand
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] while ;
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! : read-utf8-uint ( -- n )
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! 1 read dup
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! be> 0xxxxxxx?
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! [ be> ]
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! [ dup be> remaining-bytes read B{ } append-as be> ] if ;
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0 [ 1 flac-read-uint 1 = ] [ 1 + ] while
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dup [ 7 swap - flac-read-uint ] dip
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<iota> [
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drop
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2 flac-read-uint drop
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6 shift 6 flac-read-uint bitor
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] each ;
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: decode-block-size ( n -- n )
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dup
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@ -107,110 +83,71 @@ ERROR: invalid-subframe-sync ;
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} cond swap
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<flac-channel-assignment> ;
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! :: decode-header ( bitstream -- frame-header )
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! [
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! 14 bitstream read-bit drop ! ignore sync
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! 1 bitstream read-bit drop ! reserved
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! 1 bitstream read-bit
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! 4 bitstream read-bit
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! 4 bitstream read-bit
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! 4 bitstream read-bit
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! 3 bitstream read-bit
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! 1 bitstream read-bit drop ! ignore magic sync
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! read-utf8-uint
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! [
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! {
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! [ <flac-frame-number-type> ]
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! [ decode-block-size ]
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! [ decode-sample-rate ]
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! [ decode-channels ]
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! [ decode-bits-per-sample ]
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! } spread
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! ] dip
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! 1 read be>
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! ] with-big-endian
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! flac-frame-header boa ;
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!
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! : decode-subframe-type ( n -- order type )
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! dup
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! {
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! { [ 0 = ] [ drop f 0 ] }
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! { [ 1 = ] [ drop f 1 ] }
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! { [ 8 12 between? ] [ -1 shift 7 bitand 2 ] }
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! { [ 32 63 between? ] [ -1 shift 31 bitand 3 ] }
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! [ drop reserved-subframe-type ]
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! } cond-case <flac-subframe-type> swap ;
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!
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! : read-residual ( order -- residual )
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! drop "TODO" ;
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!
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! : read-constant-subframe ( frame-header subframe-header -- constant-subframe )
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! drop bits-per-sample>> 8 / read be> flac-subframe-constant boa ;
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!
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! : read-fixed-subframe ( fame-header subframe-header -- fixed-subframe )
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! order>> swap bits-per-sample>> <repetition> [
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! 8 / read be>
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! ] map flac-subframe-fixed new swap >>warmup dup . ;
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!
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! : read-lpc-subframe ( predictive-order -- lpc-subframe )
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! drop "TODO" ;
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!
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! :: decode-subframe-header ( bitstream -- subframe-header )
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! 1 bitstream read-bit 1 = [ invalid-subframe-sync ] when
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! 6 bitstream read-bit decode-subframe-type
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! 1 bitstream read-bit ! TODO: wasted-bits: 0 for now..
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! flac-subframe-header boa ;
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!
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! ! TODO: actually decode based on subframe type
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! ! TODO: handle wasted bits assuming 1 byte for now :/
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! : read-subframe ( frame-header -- subframe )
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! 1 read bitstreams:<msb0-bit-reader> decode-subframe-header dup dup
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! [
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! subframe-type>>
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! {
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! { subframe-type-constant [ read-constant-subframe ] }
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! { subframe-type-fixed [ read-fixed-subframe ] }
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! } case
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! ] dip swap flac-subframe boa ;
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!
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! : read-subframes ( frame-header -- seq )
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! dup channels>> swap <repetition> [ dup . read-subframe ] map ;
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!
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! : read-frame-header ( -- frame-header )
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! 4 read bitstreams:<msb0-bit-reader> decode-header ;
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!
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! : read-frame-footer ( -- frame-footer )
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! 2 read be> flac-frame-footer boa ;
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!
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! : read-frame ( -- frame )
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! read-frame-header dup
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! read-subframes
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! read-frame-footer
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! flac-frame boa ;
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!
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! : read-flac-file ( filename -- something )
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! binary
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! [
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! read-flac-magic [ not-a-flac-file ] unless
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! read-stream-info .
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! skip-metadata
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! ! 51448296 seek-absolute seek-input
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! 4 <iota> [ drop read-frame ] map
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! ] with-file-reader ;
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: read-flac-subframe-constant ( frame-header subframe-header -- constant-subframe )
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drop bits-per-sample>> flac-read-uint flac-subframe-constant boa ;
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: read-flac-subframe-fixed ( frame-header subframe-header -- fixed-subframe )
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2drop flac-subframe-fixed new ;
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: decode-flac-subframe-type ( n -- order type )
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dup
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{
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{ [ 0 = ] [ drop f 0 ] }
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{ [ 1 = ] [ drop f 1 ] }
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{ [ 8 12 between? ] [ -1 shift 7 bitand 2 ] }
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{ [ 32 63 between? ] [ -1 shift 31 bitand 3 ] }
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[ drop reserved-subframe-type ]
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} cond-case
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<flac-subframe-type> swap ;
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: read-flac-subframe-header ( -- subframe-header )
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1 flac-read-uint 1 = [ invalid-subframe-sync ] when
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6 flac-read-uint decode-flac-subframe-type
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1 flac-read-uint ! TODO: handle wasted bits
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flac-subframe-header boa ;
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: read-flac-subframe ( frame-header -- subframe )
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read-flac-subframe-header dup dup
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[
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subframe-type>>
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{
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{ subframe-type-constant [ read-flac-subframe-constant ] }
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{ subframe-type-fixed [ read-flac-subframe-fixed ] }
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} case
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] dip swap
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flac-subframe boa ;
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: read-flac-subframes ( frame-header -- seq )
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dup channels>> swap <repetition> [ read-flac-subframe ] map ;
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: read-flac-frame-header ( -- frame-header )
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14 flac-read-uint drop
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1 flac-read-uint drop
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1 flac-read-uint <flac-frame-number-type>
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4 flac-read-uint decode-block-size
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4 flac-read-uint decode-sample-rate
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4 flac-read-uint decode-channels
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3 flac-read-uint decode-bits-per-sample
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1 flac-read-uint drop
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14 flac-read-uint drop ! ignore sync
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1 flac-read-uint drop ! reserved
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1 flac-read-uint
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4 flac-read-uint
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4 flac-read-uint
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4 flac-read-uint
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3 flac-read-uint
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1 flac-read-uint drop ! ignore magic sync for now
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read-utf8-uint
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[
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{
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[ <flac-frame-number-type> ]
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[ decode-block-size ]
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[ decode-sample-rate ]
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[ decode-channels ]
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[ decode-bits-per-sample ]
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} spread
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] dip
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8 flac-read-uint
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flac-frame-header boa ;
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: read-flac-frame ( -- frame )
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read-flac-frame-header
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read-flac-subframes ;
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: read-flac-file ( filename -- flac-stream )
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[
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read-flac-metadata
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] with-flac-stream-reader ;
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read-flac-metadata drop
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read-flac-frame
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] with-flac-file-reader ;
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