1 /*****************************************************************************
2 * idct.c : C IDCT module
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: idct.c,v 1.20 2002/02/15 13:32:53 sam Exp $
7 * Author: Gaƫl Hendryckx <jimmy@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
30 #include <videolan/vlc.h>
35 /*****************************************************************************
36 * Local and extern prototypes.
37 *****************************************************************************/
38 static void idct_getfunctions( function_list_t * p_function_list );
40 /*****************************************************************************
41 * Build configuration tree.
42 *****************************************************************************/
47 SET_DESCRIPTION( "IDCT module" )
48 ADD_CAPABILITY( IDCT, 50 )
50 ADD_SHORTCUT( "idct" )
54 idct_getfunctions( &p_module->p_functions->idct );
57 MODULE_DEACTIVATE_START
58 MODULE_DEACTIVATE_STOP
60 /* Following functions are local */
62 /*****************************************************************************
63 * NormScan : Unused in this IDCT
64 *****************************************************************************/
65 static void NormScan( u8 ppi_scan[2][64] )
69 /*****************************************************************************
70 * IDCT : IDCT function for normal matrices
71 *****************************************************************************/
72 static __inline__ void IDCT( dctelem_t * p_block )
74 s32 tmp0, tmp1, tmp2, tmp3;
75 s32 tmp10, tmp11, tmp12, tmp13;
76 s32 z1, z2, z3, z4, z5;
77 s32 d0, d1, d2, d3, d4, d5, d6, d7;
83 /* Pass 1: process rows. */
84 /* Note results are scaled up by sqrt(8) compared to a true IDCT; */
85 /* furthermore, we scale the results by 2**PASS1_BITS. */
89 for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--)
91 /* Due to quantization, we will usually find that many of the input
92 * coefficients are zero, especially the AC terms. We can exploit this
93 * by short-circuiting the IDCT calculation for any row in which all
94 * the AC terms are zero. In that case each output is equal to the
95 * DC coefficient (with scale factor as needed).
96 * With typical images and quantization tables, half or more of the
97 * row DCT calculations can be simplified this way.
100 register int * idataptr = (int*)dataptr;
103 if ( (d1 == 0) && ((idataptr[1] | idataptr[2] | idataptr[3]) == 0) )
105 /* AC terms all zero */
108 /* Compute a 32 bit value to assign. */
109 dctelem_t dcval = (dctelem_t) (d0 << PASS1_BITS);
110 register int v = (dcval & 0xffff) | (dcval << 16);
118 dataptr += DCTSIZE; /* advance pointer to next row */
128 /* Even part: reverse the even part of the forward DCT. */
129 /* The rotator is sqrt(2)*c(-6). */
138 /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
139 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
140 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
141 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
143 tmp0 = (d0 + d4) << CONST_BITS;
144 tmp1 = (d0 - d4) << CONST_BITS;
153 /* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */
154 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
155 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
156 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
158 tmp0 = d4 << CONST_BITS;
163 tmp12 = -(tmp0 + tmp2);
170 /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
171 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
172 tmp3 = MULTIPLY(d6, FIX(0.541196100));
174 tmp0 = (d0 + d4) << CONST_BITS;
175 tmp1 = (d0 - d4) << CONST_BITS;
184 /* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */
185 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
186 tmp3 = MULTIPLY(d6, FIX(0.541196100));
188 tmp0 = d4 << CONST_BITS;
193 tmp12 = -(tmp0 + tmp2);
203 /* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */
204 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
205 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
206 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
208 tmp0 = d0 << CONST_BITS;
217 /* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */
218 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
219 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
220 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
232 /* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */
233 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
234 tmp3 = MULTIPLY(d6, FIX(0.541196100));
236 tmp0 = d0 << CONST_BITS;
245 /* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */
246 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
247 tmp3 = MULTIPLY(d6, FIX(0.541196100));
265 /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
266 tmp2 = MULTIPLY(d2, FIX(0.541196100));
267 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
269 tmp0 = (d0 + d4) << CONST_BITS;
270 tmp1 = (d0 - d4) << CONST_BITS;
279 /* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */
280 tmp2 = MULTIPLY(d2, FIX(0.541196100));
281 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
283 tmp0 = d4 << CONST_BITS;
288 tmp12 = -(tmp0 + tmp2);
295 /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
296 tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
297 tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
301 /* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */
302 tmp10 = tmp13 = d4 << CONST_BITS;
303 tmp11 = tmp12 = -tmp10;
313 /* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */
314 tmp2 = MULTIPLY(d2, FIX(0.541196100));
315 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
317 tmp0 = d0 << CONST_BITS;
326 /* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */
327 tmp2 = MULTIPLY(d2, FIX(0.541196100));
328 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
340 /* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */
341 tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS;
345 /* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */
346 tmp10 = tmp13 = tmp11 = tmp12 = 0;
353 /* Odd part per figure 8; the matrix is unitary and hence its
354 * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
365 /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */
370 z5 = MULTIPLY(z3 + z4, FIX(1.175875602));
372 tmp0 = MULTIPLY(d7, FIX(0.298631336));
373 tmp1 = MULTIPLY(d5, FIX(2.053119869));
374 tmp2 = MULTIPLY(d3, FIX(3.072711026));
375 tmp3 = MULTIPLY(d1, FIX(1.501321110));
376 z1 = MULTIPLY(z1, - FIX(0.899976223));
377 z2 = MULTIPLY(z2, - FIX(2.562915447));
378 z3 = MULTIPLY(z3, - FIX(1.961570560));
379 z4 = MULTIPLY(z4, - FIX(0.390180644));
391 /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */
394 z5 = MULTIPLY(z3 + d5, FIX(1.175875602));
396 tmp0 = MULTIPLY(d7, FIX(0.298631336));
397 tmp1 = MULTIPLY(d5, FIX(2.053119869));
398 tmp2 = MULTIPLY(d3, FIX(3.072711026));
399 z1 = MULTIPLY(d7, - FIX(0.899976223));
400 z2 = MULTIPLY(z2, - FIX(2.562915447));
401 z3 = MULTIPLY(z3, - FIX(1.961570560));
402 z4 = MULTIPLY(d5, - FIX(0.390180644));
417 /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */
420 z5 = MULTIPLY(d7 + z4, FIX(1.175875602));
422 tmp0 = MULTIPLY(d7, FIX(0.298631336));
423 tmp1 = MULTIPLY(d5, FIX(2.053119869));
424 tmp3 = MULTIPLY(d1, FIX(1.501321110));
425 z1 = MULTIPLY(z1, - FIX(0.899976223));
426 z2 = MULTIPLY(d5, - FIX(2.562915447));
427 z3 = MULTIPLY(d7, - FIX(1.961570560));
428 z4 = MULTIPLY(z4, - FIX(0.390180644));
440 /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */
441 z5 = MULTIPLY(d7 + d5, FIX(1.175875602));
443 tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
444 tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
445 z1 = MULTIPLY(d7, - FIX(0.899976223));
446 z3 = MULTIPLY(d7, - FIX(1.961570560));
447 z2 = MULTIPLY(d5, - FIX(2.562915447));
448 z4 = MULTIPLY(d5, - FIX(0.390180644));
466 /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */
469 z5 = MULTIPLY(z3 + d1, FIX(1.175875602));
471 tmp0 = MULTIPLY(d7, FIX(0.298631336));
472 tmp2 = MULTIPLY(d3, FIX(3.072711026));
473 tmp3 = MULTIPLY(d1, FIX(1.501321110));
474 z1 = MULTIPLY(z1, - FIX(0.899976223));
475 z2 = MULTIPLY(d3, - FIX(2.562915447));
476 z3 = MULTIPLY(z3, - FIX(1.961570560));
477 z4 = MULTIPLY(d1, - FIX(0.390180644));
489 /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */
491 z5 = MULTIPLY(z3, FIX(1.175875602));
493 tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
494 tmp2 = MULTIPLY(d3, FIX(0.509795579));
495 z1 = MULTIPLY(d7, - FIX(0.899976223));
496 z2 = MULTIPLY(d3, - FIX(2.562915447));
497 z3 = MULTIPLY(z3, - FIX2(0.785694958));
509 /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */
511 z5 = MULTIPLY(z1, FIX(1.175875602));
513 tmp0 = MULTIPLY(d7, - FIX2(1.662939224));
514 tmp3 = MULTIPLY(d1, FIX2(1.111140466));
515 z1 = MULTIPLY(z1, FIX2(0.275899379));
516 z3 = MULTIPLY(d7, - FIX(1.961570560));
517 z4 = MULTIPLY(d1, - FIX(0.390180644));
526 /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */
527 tmp0 = MULTIPLY(d7, - FIX2(1.387039845));
528 tmp1 = MULTIPLY(d7, FIX(1.175875602));
529 tmp2 = MULTIPLY(d7, - FIX2(0.785694958));
530 tmp3 = MULTIPLY(d7, FIX2(0.275899379));
543 /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */
546 z5 = MULTIPLY(d3 + z4, FIX(1.175875602));
548 tmp1 = MULTIPLY(d5, FIX(2.053119869));
549 tmp2 = MULTIPLY(d3, FIX(3.072711026));
550 tmp3 = MULTIPLY(d1, FIX(1.501321110));
551 z1 = MULTIPLY(d1, - FIX(0.899976223));
552 z2 = MULTIPLY(z2, - FIX(2.562915447));
553 z3 = MULTIPLY(d3, - FIX(1.961570560));
554 z4 = MULTIPLY(z4, - FIX(0.390180644));
566 /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */
568 z5 = MULTIPLY(z2, FIX(1.175875602));
570 tmp1 = MULTIPLY(d5, FIX2(1.662939225));
571 tmp2 = MULTIPLY(d3, FIX2(1.111140466));
572 z2 = MULTIPLY(z2, - FIX2(1.387039845));
573 z3 = MULTIPLY(d3, - FIX(1.961570560));
574 z4 = MULTIPLY(d5, - FIX(0.390180644));
586 /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */
588 z5 = MULTIPLY(z4, FIX(1.175875602));
590 tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
591 tmp3 = MULTIPLY(d1, FIX2(0.601344887));
592 z1 = MULTIPLY(d1, - FIX(0.899976223));
593 z2 = MULTIPLY(d5, - FIX(2.562915447));
594 z4 = MULTIPLY(z4, FIX2(0.785694958));
603 /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */
604 tmp0 = MULTIPLY(d5, FIX(1.175875602));
605 tmp1 = MULTIPLY(d5, FIX2(0.275899380));
606 tmp2 = MULTIPLY(d5, - FIX2(1.387039845));
607 tmp3 = MULTIPLY(d5, FIX2(0.785694958));
617 /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */
620 tmp2 = MULTIPLY(d3, - FIX(1.451774981));
621 tmp3 = MULTIPLY(d1, (FIX(0.211164243) - 1));
622 z1 = MULTIPLY(d1, FIX(1.061594337));
623 z2 = MULTIPLY(d3, - FIX(2.172734803));
624 z4 = MULTIPLY(z5, FIX(0.785694958));
625 z5 = MULTIPLY(z5, FIX(1.175875602));
634 /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */
635 tmp0 = MULTIPLY(d3, - FIX2(0.785694958));
636 tmp1 = MULTIPLY(d3, - FIX2(1.387039845));
637 tmp2 = MULTIPLY(d3, - FIX2(0.275899379));
638 tmp3 = MULTIPLY(d3, FIX(1.175875602));
645 /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */
646 tmp0 = MULTIPLY(d1, FIX2(0.275899379));
647 tmp1 = MULTIPLY(d1, FIX2(0.785694958));
648 tmp2 = MULTIPLY(d1, FIX(1.175875602));
649 tmp3 = MULTIPLY(d1, FIX2(1.387039845));
653 /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */
654 tmp0 = tmp1 = tmp2 = tmp3 = 0;
660 /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
662 dataptr[0] = (dctelem_t) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
663 dataptr[7] = (dctelem_t) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
664 dataptr[1] = (dctelem_t) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
665 dataptr[6] = (dctelem_t) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
666 dataptr[2] = (dctelem_t) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
667 dataptr[5] = (dctelem_t) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
668 dataptr[3] = (dctelem_t) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
669 dataptr[4] = (dctelem_t) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
671 dataptr += DCTSIZE; /* advance pointer to next row */
674 /* Pass 2: process columns. */
675 /* Note that we must descale the results by a factor of 8 == 2**3, */
676 /* and also undo the PASS1_BITS scaling. */
679 for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--)
681 /* Columns of zeroes can be exploited in the same way as we did with rows.
682 * However, the row calculation has created many nonzero AC terms, so the
683 * simplification applies less often (typically 5% to 10% of the time).
684 * On machines with very fast multiplication, it's possible that the
685 * test takes more time than it's worth. In that case this section
686 * may be commented out.
689 d0 = dataptr[DCTSIZE*0];
690 d1 = dataptr[DCTSIZE*1];
691 d2 = dataptr[DCTSIZE*2];
692 d3 = dataptr[DCTSIZE*3];
693 d4 = dataptr[DCTSIZE*4];
694 d5 = dataptr[DCTSIZE*5];
695 d6 = dataptr[DCTSIZE*6];
696 d7 = dataptr[DCTSIZE*7];
698 /* Even part: reverse the even part of the forward DCT. */
699 /* The rotator is sqrt(2)*c(-6). */
708 /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
709 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
710 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
711 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
713 tmp0 = (d0 + d4) << CONST_BITS;
714 tmp1 = (d0 - d4) << CONST_BITS;
723 /* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */
724 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
725 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
726 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
728 tmp0 = d4 << CONST_BITS;
733 tmp12 = -(tmp0 + tmp2);
740 /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
741 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
742 tmp3 = MULTIPLY(d6, FIX(0.541196100));
744 tmp0 = (d0 + d4) << CONST_BITS;
745 tmp1 = (d0 - d4) << CONST_BITS;
754 /* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */
755 tmp2 = MULTIPLY(d6, -FIX2(1.306562965));
756 tmp3 = MULTIPLY(d6, FIX(0.541196100));
758 tmp0 = d4 << CONST_BITS;
763 tmp12 = -(tmp0 + tmp2);
773 /* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */
774 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
775 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
776 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
778 tmp0 = d0 << CONST_BITS;
787 /* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */
788 z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
789 tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
790 tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
802 /* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */
803 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
804 tmp3 = MULTIPLY(d6, FIX(0.541196100));
806 tmp0 = d0 << CONST_BITS;
815 /* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */
816 tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
817 tmp3 = MULTIPLY(d6, FIX(0.541196100));
834 /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
835 tmp2 = MULTIPLY(d2, FIX(0.541196100));
836 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
838 tmp0 = (d0 + d4) << CONST_BITS;
839 tmp1 = (d0 - d4) << CONST_BITS;
848 /* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */
849 tmp2 = MULTIPLY(d2, FIX(0.541196100));
850 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
852 tmp0 = d4 << CONST_BITS;
857 tmp12 = -(tmp0 + tmp2);
864 /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
865 tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
866 tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
870 /* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */
871 tmp10 = tmp13 = d4 << CONST_BITS;
872 tmp11 = tmp12 = -tmp10;
882 /* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */
883 tmp2 = MULTIPLY(d2, FIX(0.541196100));
884 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
886 tmp0 = d0 << CONST_BITS;
895 /* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */
896 tmp2 = MULTIPLY(d2, FIX(0.541196100));
897 tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
909 /* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */
910 tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS;
914 /* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */
915 tmp10 = tmp13 = tmp11 = tmp12 = 0;
921 /* Odd part per figure 8; the matrix is unitary and hence its
922 * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
932 /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */
937 z5 = MULTIPLY(z3 + z4, FIX(1.175875602));
939 tmp0 = MULTIPLY(d7, FIX(0.298631336));
940 tmp1 = MULTIPLY(d5, FIX(2.053119869));
941 tmp2 = MULTIPLY(d3, FIX(3.072711026));
942 tmp3 = MULTIPLY(d1, FIX(1.501321110));
943 z1 = MULTIPLY(z1, - FIX(0.899976223));
944 z2 = MULTIPLY(z2, - FIX(2.562915447));
945 z3 = MULTIPLY(z3, - FIX(1.961570560));
946 z4 = MULTIPLY(z4, - FIX(0.390180644));
958 /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */
961 z5 = MULTIPLY(z3 + d5, FIX(1.175875602));
963 tmp0 = MULTIPLY(d7, FIX(0.298631336));
964 tmp1 = MULTIPLY(d5, FIX(2.053119869));
965 tmp2 = MULTIPLY(d3, FIX(3.072711026));
966 z1 = MULTIPLY(d7, - FIX(0.899976223));
967 z2 = MULTIPLY(z2, - FIX(2.562915447));
968 z3 = MULTIPLY(z3, - FIX(1.961570560));
969 z4 = MULTIPLY(d5, - FIX(0.390180644));
984 /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */
987 z5 = MULTIPLY(d7 + z4, FIX(1.175875602));
989 tmp0 = MULTIPLY(d7, FIX(0.298631336));
990 tmp1 = MULTIPLY(d5, FIX(2.053119869));
991 tmp3 = MULTIPLY(d1, FIX(1.501321110));
992 z1 = MULTIPLY(z1, - FIX(0.899976223));
993 z2 = MULTIPLY(d5, - FIX(2.562915447));
994 z3 = MULTIPLY(d7, - FIX(1.961570560));
995 z4 = MULTIPLY(z4, - FIX(0.390180644));
1007 /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */
1008 z5 = MULTIPLY(d5 + d7, FIX(1.175875602));
1010 tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
1011 tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
1012 z1 = MULTIPLY(d7, - FIX(0.899976223));
1013 z3 = MULTIPLY(d7, - FIX(1.961570560));
1014 z2 = MULTIPLY(d5, - FIX(2.562915447));
1015 z4 = MULTIPLY(d5, - FIX(0.390180644));
1033 /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */
1036 z5 = MULTIPLY(z3 + d1, FIX(1.175875602));
1038 tmp0 = MULTIPLY(d7, FIX(0.298631336));
1039 tmp2 = MULTIPLY(d3, FIX(3.072711026));
1040 tmp3 = MULTIPLY(d1, FIX(1.501321110));
1041 z1 = MULTIPLY(z1, - FIX(0.899976223));
1042 z2 = MULTIPLY(d3, - FIX(2.562915447));
1043 z3 = MULTIPLY(z3, - FIX(1.961570560));
1044 z4 = MULTIPLY(d1, - FIX(0.390180644));
1056 /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */
1058 z5 = MULTIPLY(z3, FIX(1.175875602));
1060 tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
1061 z1 = MULTIPLY(d7, - FIX(0.899976223));
1062 tmp2 = MULTIPLY(d3, FIX(0.509795579));
1063 z2 = MULTIPLY(d3, - FIX(2.562915447));
1064 z3 = MULTIPLY(z3, - FIX2(0.785694958));
1076 /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */
1078 z5 = MULTIPLY(z1, FIX(1.175875602));
1080 tmp0 = MULTIPLY(d7, - FIX2(1.662939224));
1081 tmp3 = MULTIPLY(d1, FIX2(1.111140466));
1082 z1 = MULTIPLY(z1, FIX2(0.275899379));
1083 z3 = MULTIPLY(d7, - FIX(1.961570560));
1084 z4 = MULTIPLY(d1, - FIX(0.390180644));
1093 /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */
1094 tmp0 = MULTIPLY(d7, - FIX2(1.387039845));
1095 tmp1 = MULTIPLY(d7, FIX(1.175875602));
1096 tmp2 = MULTIPLY(d7, - FIX2(0.785694958));
1097 tmp3 = MULTIPLY(d7, FIX2(0.275899379));
1110 /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */
1113 z5 = MULTIPLY(d3 + z4, FIX(1.175875602));
1115 tmp1 = MULTIPLY(d5, FIX(2.053119869));
1116 tmp2 = MULTIPLY(d3, FIX(3.072711026));
1117 tmp3 = MULTIPLY(d1, FIX(1.501321110));
1118 z1 = MULTIPLY(d1, - FIX(0.899976223));
1119 z2 = MULTIPLY(z2, - FIX(2.562915447));
1120 z3 = MULTIPLY(d3, - FIX(1.961570560));
1121 z4 = MULTIPLY(z4, - FIX(0.390180644));
1133 /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */
1135 z5 = MULTIPLY(z2, FIX(1.175875602));
1137 tmp1 = MULTIPLY(d5, FIX2(1.662939225));
1138 tmp2 = MULTIPLY(d3, FIX2(1.111140466));
1139 z2 = MULTIPLY(z2, - FIX2(1.387039845));
1140 z3 = MULTIPLY(d3, - FIX(1.961570560));
1141 z4 = MULTIPLY(d5, - FIX(0.390180644));
1153 /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */
1155 z5 = MULTIPLY(z4, FIX(1.175875602));
1157 tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
1158 tmp3 = MULTIPLY(d1, FIX2(0.601344887));
1159 z1 = MULTIPLY(d1, - FIX(0.899976223));
1160 z2 = MULTIPLY(d5, - FIX(2.562915447));
1161 z4 = MULTIPLY(z4, FIX2(0.785694958));
1170 /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */
1171 tmp0 = MULTIPLY(d5, FIX(1.175875602));
1172 tmp1 = MULTIPLY(d5, FIX2(0.275899380));
1173 tmp2 = MULTIPLY(d5, - FIX2(1.387039845));
1174 tmp3 = MULTIPLY(d5, FIX2(0.785694958));
1184 /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */
1187 tmp2 = MULTIPLY(d3, - FIX(1.451774981));
1188 tmp3 = MULTIPLY(d1, (FIX(0.211164243) - 1));
1189 z1 = MULTIPLY(d1, FIX(1.061594337));
1190 z2 = MULTIPLY(d3, - FIX(2.172734803));
1191 z4 = MULTIPLY(z5, FIX(0.785694958));
1192 z5 = MULTIPLY(z5, FIX(1.175875602));
1201 /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */
1202 tmp0 = MULTIPLY(d3, - FIX2(0.785694958));
1203 tmp1 = MULTIPLY(d3, - FIX2(1.387039845));
1204 tmp2 = MULTIPLY(d3, - FIX2(0.275899379));
1205 tmp3 = MULTIPLY(d3, FIX(1.175875602));
1212 /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */
1213 tmp0 = MULTIPLY(d1, FIX2(0.275899379));
1214 tmp1 = MULTIPLY(d1, FIX2(0.785694958));
1215 tmp2 = MULTIPLY(d1, FIX(1.175875602));
1216 tmp3 = MULTIPLY(d1, FIX2(1.387039845));
1220 /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */
1221 tmp0 = tmp1 = tmp2 = tmp3 = 0;
1227 /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
1229 dataptr[DCTSIZE*0] = (dctelem_t) DESCALE(tmp10 + tmp3,
1230 CONST_BITS+PASS1_BITS+3);
1231 dataptr[DCTSIZE*7] = (dctelem_t) DESCALE(tmp10 - tmp3,
1232 CONST_BITS+PASS1_BITS+3);
1233 dataptr[DCTSIZE*1] = (dctelem_t) DESCALE(tmp11 + tmp2,
1234 CONST_BITS+PASS1_BITS+3);
1235 dataptr[DCTSIZE*6] = (dctelem_t) DESCALE(tmp11 - tmp2,
1236 CONST_BITS+PASS1_BITS+3);
1237 dataptr[DCTSIZE*2] = (dctelem_t) DESCALE(tmp12 + tmp1,
1238 CONST_BITS+PASS1_BITS+3);
1239 dataptr[DCTSIZE*5] = (dctelem_t) DESCALE(tmp12 - tmp1,
1240 CONST_BITS+PASS1_BITS+3);
1241 dataptr[DCTSIZE*3] = (dctelem_t) DESCALE(tmp13 + tmp0,
1242 CONST_BITS+PASS1_BITS+3);
1243 dataptr[DCTSIZE*4] = (dctelem_t) DESCALE(tmp13 - tmp0,
1244 CONST_BITS+PASS1_BITS+3);
1246 dataptr++; /* advance pointer to next column */
1250 #include "idct_sparse.h"
1251 #include "idct_decl.h"