1 ! Copyright (C) 2009 Marc Fauconneau.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays byte-arrays combinators
4 grouping compression.huffman images
5 images.processing io io.binary io.encodings.binary io.files
6 io.streams.byte-array kernel locals math math.bitwise
7 math.constants math.functions math.matrices math.order
8 math.ranges math.vectors memoize multiline namespaces
9 sequences sequences.deep ;
12 QUALIFIED-WITH: bitstreams bs
14 TUPLE: jpeg-image < image
17 { color-info initial: { f f f f } }
18 { quant-tables initial: { f f } }
19 { huff-tables initial: { f f f f } }
24 : <jpeg-image> ( headers bitstream -- image )
25 jpeg-image new swap >>bitstream swap >>headers ;
27 SINGLETONS: SOF DHT DAC RST SOI EOI SOS DQT DNL DRI DHP EXP
30 ! ISO/IEC 10918-1 Table B.1
31 :: >marker ( byte -- marker )
34 { [ dup HEX: CC = ] [ { DAC } ] }
35 { [ dup HEX: C4 = ] [ { DHT } ] }
36 { [ dup HEX: C9 = ] [ { JPG } ] }
37 { [ dup -4 shift HEX: C = ] [ SOF byte 4 bits 2array ] }
39 { [ dup HEX: D8 = ] [ { SOI } ] }
40 { [ dup HEX: D9 = ] [ { EOI } ] }
41 { [ dup HEX: DA = ] [ { SOS } ] }
42 { [ dup HEX: DB = ] [ { DQT } ] }
43 { [ dup HEX: DC = ] [ { DNL } ] }
44 { [ dup HEX: DD = ] [ { DRI } ] }
45 { [ dup HEX: DE = ] [ { DHP } ] }
46 { [ dup HEX: DF = ] [ { EXP } ] }
47 { [ dup -4 shift HEX: D = ] [ RST byte 4 bits 2array ] }
49 { [ dup -4 shift HEX: E = ] [ APP byte 4 bits 2array ] }
50 { [ dup HEX: FE = ] [ { COM } ] }
51 { [ dup -4 shift HEX: F = ] [ JPG byte 4 bits 2array ] }
53 { [ dup HEX: 01 = ] [ { TEM } ] }
58 TUPLE: jpeg-chunk length type data ;
60 : <jpeg-chunk> ( type length data -- jpeg-chunk )
66 TUPLE: jpeg-color-info
67 h v quant-table dc-huff-table ac-huff-table { diff initial: 0 } id ;
69 : <jpeg-color-info> ( h v quant-table -- jpeg-color-info )
75 : jpeg> ( -- jpeg-image ) jpeg-image get ;
77 : apply-diff ( dc color -- dc' )
78 [ diff>> + dup ] [ (>>diff) ] bi ;
80 : fetch-tables ( component -- )
81 [ [ jpeg> quant-tables>> nth ] change-quant-table drop ]
82 [ [ jpeg> huff-tables>> nth ] change-dc-huff-table drop ]
83 [ [ 2 + jpeg> huff-tables>> nth ] change-ac-huff-table drop ] tri ;
85 : read4/4 ( -- a b ) read1 16 /mod ;
89 : decode-frame ( header -- )
96 swap 2array jpeg> (>>dim)
99 read1 read4/4 read1 <jpeg-color-info>
100 swap [ >>id ] keep jpeg> color-info>> set-nth
104 : decode-quant-table ( chunk -- )
111 read4/4 [ 0 assert= ] dip
113 swap jpeg> quant-tables>> set-nth
117 : decode-huff-table ( chunk -- )
121 1 ! %fixme: Should handle multiple tables at once
125 dup [ ] [ + ] map-reduce read
126 binary [ [ read [ B{ } ] unless* ] { } map-as ] with-byte-reader
127 swap jpeg> huff-tables>> set-nth
131 : decode-scan ( chunk -- )
137 read1 jpeg> color-info>> nth clone
138 read1 16 /mod [ >>dc-huff-table ] [ >>ac-huff-table ] bi*
139 ] map jpeg> (>>components)
142 read1 16 /mod [ 0 assert= ] bi@
145 : singleton-first ( seq -- elt )
146 [ length 1 assert= ] [ first ] bi ;
148 : baseline-parse ( -- )
151 [ [ type>> { SOF 0 } = ] filter singleton-first decode-frame ]
152 [ [ type>> { DQT } = ] filter [ decode-quant-table ] each ]
153 [ [ type>> { DHT } = ] filter [ decode-huff-table ] each ]
154 [ [ type>> { SOS } = ] filter singleton-first decode-scan ]
157 : parse-marker ( -- marker )
158 read1 HEX: FF assert=
161 : parse-headers ( -- chunks )
162 [ parse-marker dup { SOS } = not ]
165 dup 2 - read <jpeg-chunk>
166 ] [ produce ] keep dip swap suffix ;
168 MEMO: zig-zag ( -- zz )
170 { 0 1 5 6 14 15 27 28 }
171 { 2 4 7 13 16 26 29 42 }
172 { 3 8 12 17 25 30 41 43 }
173 { 9 11 18 24 31 40 44 53 }
174 { 10 19 23 32 39 45 52 54 }
175 { 20 22 33 38 46 51 55 60 }
176 { 21 34 37 47 50 56 59 61 }
177 { 35 36 48 49 57 58 62 63 }
180 MEMO: yuv>bgr-matrix ( -- m )
183 { 1 -0.39465 -0.58060 }
187 : wave ( x u -- n ) swap 2 * 1 + * pi * 16 / cos ;
189 :: dct-vect ( u v -- basis )
190 { 8 8 } coord-matrix [ { u v } [ wave ] 2map product ] map^2
191 1 u v [ 0 = [ 2 sqrt / ] when ] bi@ 4 / m*n ;
193 MEMO: dct-matrix ( -- m ) 64 [0,b) [ 8 /mod dct-vect flatten ] map ;
195 : mb-dim ( component -- dim ) [ h>> ] [ v>> ] bi 2array ;
197 ! : blocks ( component -- seq )
198 ! mb-dim ! coord-matrix flip concat [ [ { 2 2 } v* ] [ v+ ] bi* ] with map ;
200 : all-macroblocks ( quot: ( mb -- ) -- )
204 [ color-info>> sift { 0 0 } [ mb-dim vmax ] reduce v/ ] bi
206 coord-matrix flip concat
208 [ each ] bi* ; inline
210 : reverse-zigzag ( b -- b' ) zig-zag swap [ nth ] curry map ;
212 : idct-factor ( b -- b' ) dct-matrix v.m ;
214 USE: math.blas.vectors
215 USE: math.blas.matrices
217 MEMO: dct-matrix-blas ( -- m ) dct-matrix >float-blas-matrix ;
218 : V.M ( x A -- x.A ) Mtranspose swap M.V ;
219 : idct-blas ( b -- b' ) >float-blas-vector dct-matrix-blas V.M ;
221 : idct ( b -- b' ) idct-blas ;
223 :: draw-block ( block x,y color-id jpeg-image -- )
224 block dup length>> sqrt >fixnum group flip
225 dup matrix-dim coord-matrix flip
227 [ first2 spin nth nth ]
228 [ x,y v+ color-id jpeg-image draw-color ] bi
231 : sign-extend ( bits v -- v' )
232 swap [ ] [ 1 - 2^ < ] 2bi
233 [ -1 swap shift 1 + + ] [ drop ] if ;
235 : read1-jpeg-dc ( decoder -- dc )
236 [ read1-huff dup ] [ bs>> bs:read ] bi sign-extend ;
238 : read1-jpeg-ac ( decoder -- run/ac )
239 [ read1-huff 16 /mod dup ] [ bs>> bs:read ] bi sign-extend 2array ;
241 :: decode-block ( color -- pixels )
242 color dc-huff-table>> read1-jpeg-dc color apply-diff
243 64 0 <array> :> coefs
247 color ac-huff-table>> read1-jpeg-ac
248 [ first 1 + k + k! ] [ second k coefs set-nth ] [ ] tri
252 coefs color quant-table>> v*
253 reverse-zigzag idct ;
255 :: draw-macroblock-yuv420 ( mb blocks -- )
256 mb { 16 16 } v* :> pos
257 0 blocks nth pos { 0 0 } v+ 0 jpeg> draw-block
258 1 blocks nth pos { 8 0 } v+ 0 jpeg> draw-block
259 2 blocks nth pos { 0 8 } v+ 0 jpeg> draw-block
260 3 blocks nth pos { 8 8 } v+ 0 jpeg> draw-block
261 4 blocks nth 8 group 2 matrix-zoom concat pos 1 jpeg> draw-block
262 5 blocks nth 8 group 2 matrix-zoom concat pos 2 jpeg> draw-block ;
264 :: draw-macroblock-yuv444 ( mb blocks -- )
266 3 iota [ [ blocks nth pos ] [ jpeg> draw-block ] bi ] each ;
268 :: draw-macroblock-y ( mb blocks -- )
270 0 blocks nth pos 0 jpeg> draw-block
271 64 0 <array> pos 1 jpeg> draw-block
272 64 0 <array> pos 2 jpeg> draw-block ;
276 ! [ 8 group 2 matrix-zoom concat ] unless
277 ! pos { 8 8 } v* color jpeg> draw-block ;
279 : decode-macroblock ( -- blocks )
282 [ mb-dim first2 * iota ]
283 [ [ decode-block ] curry replicate ] bi
286 : cleanup-bitstream ( bytes -- bytes' )
289 { HEX: FF } read-until
290 read1 tuck HEX: 00 = and
293 swap >marker { EOI } assert=
298 : setup-bitmap ( image -- )
299 dup dim>> 16 v/n [ ceiling ] map 16 v*n >>dim
300 BGR >>component-order
301 ubyte-components >>component-type
303 dup dim>> first2 * 3 * 0 <array> >>bitmap
306 ERROR: unsupported-colorspace ;
307 SINGLETONS: YUV420 YUV444 Y MAGIC! ;
309 :: detect-colorspace ( jpeg-image -- csp )
310 jpeg-image color-info>> sift :> colors
312 colors length 1 = [ drop Y ] when
315 colors [ mb-dim { 1 1 } = ] all?
319 [ [ mb-dim { 1 1 } = ] all? ]
320 [ mb-dim { 2 2 } = ] bi* and
324 ! this eats ~50% cpu time
325 : draw-macroblocks ( mbs -- )
326 jpeg> detect-colorspace
328 { YUV420 [ [ first2 draw-macroblock-yuv420 ] each ] }
329 { YUV444 [ [ first2 draw-macroblock-yuv444 ] each ] }
330 { Y [ [ first2 draw-macroblock-y ] each ] }
331 [ unsupported-colorspace ]
334 ! this eats ~25% cpu time
335 : color-transform ( yuv -- rgb )
336 { 128 0 0 } v+ yuv>bgr-matrix swap m.v
337 [ 0 max 255 min >fixnum ] map ;
339 : baseline-decompress ( -- )
340 jpeg> bitstream>> cleanup-bitstream { 255 255 255 255 } append
341 >byte-array bs:<msb0-bit-reader> jpeg> (>>bitstream)
344 [ [ [ <huffman-decoder> ] with map ] change-huff-tables drop ] bi
345 jpeg> components>> [ fetch-tables ] each
346 [ decode-macroblock 2array ] accumulator
347 [ all-macroblocks ] dip
348 jpeg> setup-bitmap draw-macroblocks
349 jpeg> bitmap>> 3 <groups> [ color-transform ] change-each
350 jpeg> [ >byte-array ] change-bitmap drop ;
352 ERROR: not-a-jpeg-image ;
356 : load-jpeg ( path -- image )
358 parse-marker { SOI } = [ not-a-jpeg-image ] unless
360 contents <jpeg-image>
367 M: jpeg-image load-image* ( path jpeg-image -- bitmap )