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vlc-2-2
Commit 4d8747f7 authored by Gaël Hendryckx's avatar Gaël Hendryckx
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  Du rififi dans la DCT.

--
jimmy
parent c609a04c
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src/video_decoder/vdec_idct.c
View file @ 4d8747f7
...@@ -28,16 +28,12 @@ ...@@ -28,16 +28,12 @@
#include "decoder_fifo.h" #include "decoder_fifo.h"
#include "video.h" #include "video.h"
#include "video_output.h" #include "video_output.h"
#include "video_parser.h"
#include "vdec_idct.h" #include "video_fifo.h"
#include "video_decoder.h" #include "video_decoder.h"
#include "vdec_motion.h"
#include "vpar_blocks.h" #include "vdec_idct.h"
#include "vpar_headers.h"
#include "video_fifo.h"
#include "vpar_synchro.h"
#include "video_parser.h"
/* /*
* Local prototypes * Local prototypes
...@@ -49,22 +45,1260 @@ ...@@ -49,22 +45,1260 @@
/***************************************************************************** /*****************************************************************************
* vdec_DummyIDCT : dummy function that does nothing * vdec_DummyIDCT : dummy function that does nothing
*****************************************************************************/ *****************************************************************************/
void vdec_DummyIDCT( elem_t * p_block, int i_idontcare ) void vdec_DummyIDCT( vdec_thread_t * p_vdec, elem_t * p_block,
int i_idontcare )
{ {
} }
/***************************************************************************** /*****************************************************************************
* init_SparseIDCT : initialize datas for vdec_SparceIDCT
* vdec_SparseIDCT : IDCT function for sparse matrices * vdec_SparseIDCT : IDCT function for sparse matrices
*****************************************************************************/ *****************************************************************************/
void vdec_SparseIDCT( elem_t * p_block, int i_sparse_pos )
void vdec_InitIDCT (vdec_thread_t * p_vdec)
{
int i;
elem_t p_pre[][64]=vdec_thread_t->p_pre_idct;
for (i=0; i<64; i++)
{
memset ((char *) p_pre[i], 0, 64*sizeof(elem_t));
p_pre[i][i]= 1 << SPARSE_SCALE_FACTOR;
vdec_IDCT (p_vdec, p_pre[i], 0);
}
}
void vdec_SparseIDCT (vdec_thread_t * p_vdec, elem_t * p_block,
int i_sparse_pos)
{ {
/* Copy from mpeg_play */ short int val;
int * dp;
int v;
short int * p_dest;
short int * p_source;
int coeff, rr;
/* If DC Coefficient. */
if ( i_sparse_pos == 0 )
{
dp=(int *)p_block;
val= *p_block >> 6;
/* Compute int to assign. This speeds things up a bit */
v = ((val & 0xffff) | (val << 16));
dp[0] = v; dp[1] = v; dp[2] = v; dp[3] = v;
dp[4] = v; dp[5] = v; dp[6] = v; dp[7] = v;
dp[8] = v; dp[9] = v; dp[10] = v; dp[11] = v;
dp[12] = v; dp[13] = v; dp[14] = v; dp[15] = v;
dp[16] = v; dp[17] = v; dp[18] = v; dp[19] = v;
dp[20] = v; dp[21] = v; dp[22] = v; dp[23] = v;
dp[24] = v; dp[25] = v; dp[26] = v; dp[27] = v;
dp[28] = v; dp[29] = v; dp[30] = v; dp[31] = v;
return;
}
/* Some other coefficient. */
p_dest=(short int *)p_block;
p_source=(short int *)p_vdec->p_pre_idct[i_sparse_pos];
coef=p_dest[i_sparse_pos];
for (rr=0; rr<4; rr++)
{
p_dest[0] = (p_source[0] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[1] = (p_source[1] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[2] = (p_source[2] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[3] = (p_source[3] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[4] = (p_source[4] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[5] = (p_source[5] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[6] = (p_source[6] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[7] = (p_source[7] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[8] = (p_source[8] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[9] = (p_source[9] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[10] = (p_source[10] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[11] = (p_source[11] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[12] = (p_source[12] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[13] = (p_source[13] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[14] = (p_source[14] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest[15] = (p_source[15] * coeff) >> SPARSE_SCALE_FACTOR;
p_dest += 16;
p_source += 16;
}
return;
} }
/***************************************************************************** /*****************************************************************************
* vdec_IDCT : IDCT function for normal matrices * vdec_IDCT : IDCT function for normal matrices
*****************************************************************************/ *****************************************************************************/
void vdec_IDCT( elem_t * p_block, int i_idontcare ) void vdec_IDCT( vdec_thread_t * p_vdec, elem_t * p_block, int i_idontcare )
{ {
INT32 tmp0, tmp1, tmp2, tmp3;
INT32 tmp10, tmp11, tmp12, tmp13;
INT32 z1, z2, z3, z4, z5;
INT32 d0, d1, d2, d3, d4, d5, d6, d7;
elem_t * dataptr;
int rowctr;
SHIFT_TEMPS
/* Pass 1: process rows. */
/* Note results are scaled up by sqrt(8) compared to a true IDCT; */
/* furthermore, we scale the results by 2**PASS1_BITS. */
dataptr = p_block;
for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--)
{
/* Due to quantization, we will usually find that many of the input
* coefficients are zero, especially the AC terms. We can exploit this
* by short-circuiting the IDCT calculation for any row in which all
* the AC terms are zero. In that case each output is equal to the
* DC coefficient (with scale factor as needed).
* With typical images and quantization tables, half or more of the
* row DCT calculations can be simplified this way.
*/
register int * idataptr = (int*)dataptr;
d0 = dataptr[0];
d1 = dataptr[1];
if ( (d1 == 0) && ((idataptr[1] | idataptr[2] | idataptr[3]) == 0) )
{
/* AC terms all zero */
if (d0)
{
/* Compute a 32 bit value to assign. */
elem_t dcval = (elem_t) (d0 << PASS1_BITS);
register int v = (dcval & 0xffff) | (dcval << 16);
idataptr[0] = v;
idataptr[1] = v;
idataptr[2] = v;
idataptr[3] = v;
}
dataptr += DCTSIZE; /* advance pointer to next row */
continue;
}
d2 = dataptr[2];
d3 = dataptr[3];
d4 = dataptr[4];
d5 = dataptr[5];
d6 = dataptr[6];
d7 = dataptr[7];
/* Even part: reverse the even part of the forward DCT. */
/* The rotator is sqrt(2)*c(-6). */
if (d6)
{
if (d4)
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp0 = (d0 + d4) << CONST_BITS;
tmp1 = (d0 - d4) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp0 = (d0 + d4) << CONST_BITS;
tmp1 = (d0 - d4) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
}
else
{
/* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
}
else
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
}
else
{
/* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
}
}
else
{
if (d4)
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp0 = (d0 + d4) << CONST_BITS;
tmp1 = (d0 - d4) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
}
else
{
/* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = d4 << CONST_BITS;
tmp11 = tmp12 = -tmp10;
}
}
}
else
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS;
}
else
{
/* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = 0;
}
}
}
}
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
if (d7)
{
if (d5)
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */
z1 = d7 + d1;
z2 = d5 + d3;
z3 = d7 + d3;
z4 = d5 + d1;
z5 = MULTIPLY(z3 + z4, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(z1, - FIX(0.899976223));
z2 = MULTIPLY(z2, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX(1.961570560));
z4 = MULTIPLY(z4, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */
z2 = d5 + d3;
z3 = d7 + d3;
z5 = MULTIPLY(z3 + d5, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
z1 = MULTIPLY(d7, - FIX(0.899976223));
z2 = MULTIPLY(z2, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX(1.961570560));
z4 = MULTIPLY(d5, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 = z1 + z4;
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */
z1 = d7 + d1;
z4 = d5 + d1;
z5 = MULTIPLY(d7 + z4, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(z1, - FIX(0.899976223));
z2 = MULTIPLY(d5, - FIX(2.562915447));
z3 = MULTIPLY(d7, - FIX(1.961570560));
z4 = MULTIPLY(z4, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 = z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */
z5 = MULTIPLY(d7 + d5, FIX(1.175875602));
tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
z1 = MULTIPLY(d7, - FIX(0.899976223));
z3 = MULTIPLY(d7, - FIX(1.961570560));
z2 = MULTIPLY(d5, - FIX(2.562915447));
z4 = MULTIPLY(d5, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z3;
tmp1 += z4;
tmp2 = z2 + z3;
tmp3 = z1 + z4;
}
}
}
else
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */
z1 = d7 + d1;
z3 = d7 + d3;
z5 = MULTIPLY(z3 + d1, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(z1, - FIX(0.899976223));
z2 = MULTIPLY(d3, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX(1.961570560));
z4 = MULTIPLY(d1, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 = z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */
z3 = d7 + d3;
z5 = MULTIPLY(z3, FIX(1.175875602));
tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
tmp2 = MULTIPLY(d3, FIX(0.509795579));
z1 = MULTIPLY(d7, - FIX(0.899976223));
z2 = MULTIPLY(d3, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX2(0.785694958));
tmp0 += z3;
tmp1 = z2 + z5;
tmp2 += z3;
tmp3 = z1 + z5;
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */
z1 = d7 + d1;
z5 = MULTIPLY(z1, FIX(1.175875602));
tmp0 = MULTIPLY(d7, - FIX2(1.662939224));
tmp3 = MULTIPLY(d1, FIX2(1.111140466));
z1 = MULTIPLY(z1, FIX2(0.275899379));
z3 = MULTIPLY(d7, - FIX(1.961570560));
z4 = MULTIPLY(d1, - FIX(0.390180644));
tmp0 += z1;
tmp1 = z4 + z5;
tmp2 = z3 + z5;
tmp3 += z1;
}
else
{
/* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */
tmp0 = MULTIPLY(d7, - FIX2(1.387039845));
tmp1 = MULTIPLY(d7, FIX(1.175875602));
tmp2 = MULTIPLY(d7, - FIX2(0.785694958));
tmp3 = MULTIPLY(d7, FIX2(0.275899379));
}
}
}
}
else
{
if (d5)
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */
z2 = d5 + d3;
z4 = d5 + d1;
z5 = MULTIPLY(d3 + z4, FIX(1.175875602));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(d1, - FIX(0.899976223));
z2 = MULTIPLY(z2, - FIX(2.562915447));
z3 = MULTIPLY(d3, - FIX(1.961570560));
z4 = MULTIPLY(z4, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 = z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */
z2 = d5 + d3;
z5 = MULTIPLY(z2, FIX(1.175875602));
tmp1 = MULTIPLY(d5, FIX2(1.662939225));
tmp2 = MULTIPLY(d3, FIX2(1.111140466));
z2 = MULTIPLY(z2, - FIX2(1.387039845));
z3 = MULTIPLY(d3, - FIX(1.961570560));
z4 = MULTIPLY(d5, - FIX(0.390180644));
tmp0 = z3 + z5;
tmp1 += z2;
tmp2 += z2;
tmp3 = z4 + z5;
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */
z4 = d5 + d1;
z5 = MULTIPLY(z4, FIX(1.175875602));
tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
tmp3 = MULTIPLY(d1, FIX2(0.601344887));
z1 = MULTIPLY(d1, - FIX(0.899976223));
z2 = MULTIPLY(d5, - FIX(2.562915447));
z4 = MULTIPLY(z4, FIX2(0.785694958));
tmp0 = z1 + z5;
tmp1 += z4;
tmp2 = z2 + z5;
tmp3 += z4;
}
else
{
/* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */
tmp0 = MULTIPLY(d5, FIX(1.175875602));
tmp1 = MULTIPLY(d5, FIX2(0.275899380));
tmp2 = MULTIPLY(d5, - FIX2(1.387039845));
tmp3 = MULTIPLY(d5, FIX2(0.785694958));
}
}
}
else
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */
z5 = d3 + d1;
tmp2 = MULTIPLY(d3, - FIX(1.451774981));
tmp3 = MULTIPLY(d1, (FIX(0.211164243) - 1));
z1 = MULTIPLY(d1, FIX(1.061594337));
z2 = MULTIPLY(d3, - FIX(2.172734803));
z4 = MULTIPLY(z5, FIX(0.785694958));
z5 = MULTIPLY(z5, FIX(1.175875602));
tmp0 = z1 - z4;
tmp1 = z2 + z4;
tmp2 += z5;
tmp3 += z5;
}
else
{
/* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */
tmp0 = MULTIPLY(d3, - FIX2(0.785694958));
tmp1 = MULTIPLY(d3, - FIX2(1.387039845));
tmp2 = MULTIPLY(d3, - FIX2(0.275899379));
tmp3 = MULTIPLY(d3, FIX(1.175875602));
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */
tmp0 = MULTIPLY(d1, FIX2(0.275899379));
tmp1 = MULTIPLY(d1, FIX2(0.785694958));
tmp2 = MULTIPLY(d1, FIX(1.175875602));
tmp3 = MULTIPLY(d1, FIX2(1.387039845));
}
else
{
/* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */
tmp0 = tmp1 = tmp2 = tmp3 = 0;
}
}
}
}
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
dataptr[0] = (elem_t) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS);
dataptr[7] = (elem_t) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS);
dataptr[1] = (elem_t) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS);
dataptr[6] = (elem_t) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS);
dataptr[2] = (elem_t) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS);
dataptr[5] = (elem_t) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS);
dataptr[3] = (elem_t) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS);
dataptr[4] = (elem_t) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS);
dataptr += DCTSIZE; /* advance pointer to next row */
}
/* Pass 2: process columns. */
/* Note that we must descale the results by a factor of 8 == 2**3, */
/* and also undo the PASS1_BITS scaling. */
dataptr = data;
for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--)
{
/* Columns of zeroes can be exploited in the same way as we did with rows.
* However, the row calculation has created many nonzero AC terms, so the
* simplification applies less often (typically 5% to 10% of the time).
* On machines with very fast multiplication, it's possible that the
* test takes more time than it's worth. In that case this section
* may be commented out.
*/
d0 = dataptr[DCTSIZE*0];
d1 = dataptr[DCTSIZE*1];
d2 = dataptr[DCTSIZE*2];
d3 = dataptr[DCTSIZE*3];
d4 = dataptr[DCTSIZE*4];
d5 = dataptr[DCTSIZE*5];
d6 = dataptr[DCTSIZE*6];
d7 = dataptr[DCTSIZE*7];
/* Even part: reverse the even part of the forward DCT. */
/* The rotator is sqrt(2)*c(-6). */
if (d6)
{
if (d4)
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp0 = (d0 + d4) << CONST_BITS;
tmp1 = (d0 - d4) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp0 = (d0 + d4) << CONST_BITS;
tmp1 = (d0 - d4) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
}
else
{
/* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(d6, -FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
}
else
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX(0.541196100));
tmp2 = z1 + MULTIPLY(d6, - FIX(1.847759065));
tmp3 = z1 + MULTIPLY(d2, FIX(0.765366865));
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
}
else
{
/* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(d6, - FIX2(1.306562965));
tmp3 = MULTIPLY(d6, FIX(0.541196100));
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
}
}
else
{
if (d4)
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp0 = (d0 + d4) << CONST_BITS;
tmp1 = (d0 - d4) << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
}
else
{
/* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = d4 << CONST_BITS;
tmp11 = tmp12 = -tmp10;
}
}
}
else
{
if (d2)
{
if (d0)
{
/* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
}
else
{
/* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX(0.541196100));
tmp3 = MULTIPLY(d2, (FIX(1.306562965) + .5));
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
else
{
if (d0)
{
/* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS;
}
else
{
/* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = 0;
}
}
}
}
/* Odd part per figure 8; the matrix is unitary and hence its
* transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively.
*/
if (d7)
{
if (d5)
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */
z1 = d7 + d1;
z2 = d5 + d3;
z3 = d7 + d3;
z4 = d5 + d1;
z5 = MULTIPLY(z3 + z4, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(z1, - FIX(0.899976223));
z2 = MULTIPLY(z2, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX(1.961570560));
z4 = MULTIPLY(z4, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */
z2 = d5 + d3;
z3 = d7 + d3;
z5 = MULTIPLY(z3 + d5, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
z1 = MULTIPLY(d7, - FIX(0.899976223));
z2 = MULTIPLY(z2, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX(1.961570560));
z4 = MULTIPLY(d5, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 = z1 + z4;
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */
z1 = d7 + d1;
z4 = d5 + d1;
z5 = MULTIPLY(d7 + z4, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(z1, - FIX(0.899976223));
z2 = MULTIPLY(d5, - FIX(2.562915447));
z3 = MULTIPLY(d7, - FIX(1.961570560));
z4 = MULTIPLY(z4, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 = z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */
z5 = MULTIPLY(d5 + d7, FIX(1.175875602));
tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
z1 = MULTIPLY(d7, - FIX(0.899976223));
z3 = MULTIPLY(d7, - FIX(1.961570560));
z2 = MULTIPLY(d5, - FIX(2.562915447));
z4 = MULTIPLY(d5, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z3;
tmp1 += z4;
tmp2 = z2 + z3;
tmp3 = z1 + z4;
}
}
}
else
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */
z1 = d7 + d1;
z3 = d7 + d3;
z5 = MULTIPLY(z3 + d1, FIX(1.175875602));
tmp0 = MULTIPLY(d7, FIX(0.298631336));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(z1, - FIX(0.899976223));
z2 = MULTIPLY(d3, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX(1.961570560));
z4 = MULTIPLY(d1, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 = z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */
z3 = d7 + d3;
z5 = MULTIPLY(z3, FIX(1.175875602));
tmp0 = MULTIPLY(d7, - FIX2(0.601344887));
z1 = MULTIPLY(d7, - FIX(0.899976223));
tmp2 = MULTIPLY(d3, FIX(0.509795579));
z2 = MULTIPLY(d3, - FIX(2.562915447));
z3 = MULTIPLY(z3, - FIX2(0.785694958));
tmp0 += z3;
tmp1 = z2 + z5;
tmp2 += z3;
tmp3 = z1 + z5;
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */
z1 = d7 + d1;
z5 = MULTIPLY(z1, FIX(1.175875602));
tmp0 = MULTIPLY(d7, - FIX2(1.662939224));
tmp3 = MULTIPLY(d1, FIX2(1.111140466));
z1 = MULTIPLY(z1, FIX2(0.275899379));
z3 = MULTIPLY(d7, - FIX(1.961570560));
z4 = MULTIPLY(d1, - FIX(0.390180644));
tmp0 += z1;
tmp1 = z4 + z5;
tmp2 = z3 + z5;
tmp3 += z1;
}
else
{
/* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */
tmp0 = MULTIPLY(d7, - FIX2(1.387039845));
tmp1 = MULTIPLY(d7, FIX(1.175875602));
tmp2 = MULTIPLY(d7, - FIX2(0.785694958));
tmp3 = MULTIPLY(d7, FIX2(0.275899379));
}
}
}
}
else
{
if (d5)
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */
z2 = d5 + d3;
z4 = d5 + d1;
z5 = MULTIPLY(d3 + z4, FIX(1.175875602));
tmp1 = MULTIPLY(d5, FIX(2.053119869));
tmp2 = MULTIPLY(d3, FIX(3.072711026));
tmp3 = MULTIPLY(d1, FIX(1.501321110));
z1 = MULTIPLY(d1, - FIX(0.899976223));
z2 = MULTIPLY(z2, - FIX(2.562915447));
z3 = MULTIPLY(d3, - FIX(1.961570560));
z4 = MULTIPLY(z4, - FIX(0.390180644));
z3 += z5;
z4 += z5;
tmp0 = z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
}
else
{
/* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */
z2 = d5 + d3;
z5 = MULTIPLY(z2, FIX(1.175875602));
tmp1 = MULTIPLY(d5, FIX2(1.662939225));
tmp2 = MULTIPLY(d3, FIX2(1.111140466));
z2 = MULTIPLY(z2, - FIX2(1.387039845));
z3 = MULTIPLY(d3, - FIX(1.961570560));
z4 = MULTIPLY(d5, - FIX(0.390180644));
tmp0 = z3 + z5;
tmp1 += z2;
tmp2 += z2;
tmp3 = z4 + z5;
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */
z4 = d5 + d1;
z5 = MULTIPLY(z4, FIX(1.175875602));
tmp1 = MULTIPLY(d5, - FIX2(0.509795578));
tmp3 = MULTIPLY(d1, FIX2(0.601344887));
z1 = MULTIPLY(d1, - FIX(0.899976223));
z2 = MULTIPLY(d5, - FIX(2.562915447));
z4 = MULTIPLY(z4, FIX2(0.785694958));
tmp0 = z1 + z5;
tmp1 += z4;
tmp2 = z2 + z5;
tmp3 += z4;
}
else
{
/* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */
tmp0 = MULTIPLY(d5, FIX(1.175875602));
tmp1 = MULTIPLY(d5, FIX2(0.275899380));
tmp2 = MULTIPLY(d5, - FIX2(1.387039845));
tmp3 = MULTIPLY(d5, FIX2(0.785694958));
}
}
}
else
{
if (d3)
{
if (d1)
{
/* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */
z5 = d3 + d1;
tmp2 = MULTIPLY(d3, - FIX(1.451774981));
tmp3 = MULTIPLY(d1, (FIX(0.211164243) - 1));
z1 = MULTIPLY(d1, FIX(1.061594337));
z2 = MULTIPLY(d3, - FIX(2.172734803));
z4 = MULTIPLY(z5, FIX(0.785694958));
z5 = MULTIPLY(z5, FIX(1.175875602));
tmp0 = z1 - z4;
tmp1 = z2 + z4;
tmp2 += z5;
tmp3 += z5;
}
else
{
/* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */
tmp0 = MULTIPLY(d3, - FIX2(0.785694958));
tmp1 = MULTIPLY(d3, - FIX2(1.387039845));
tmp2 = MULTIPLY(d3, - FIX2(0.275899379));
tmp3 = MULTIPLY(d3, FIX(1.175875602));
}
}
else
{
if (d1)
{
/* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */
tmp0 = MULTIPLY(d1, FIX2(0.275899379));
tmp1 = MULTIPLY(d1, FIX2(0.785694958));
tmp2 = MULTIPLY(d1, FIX(1.175875602));
tmp3 = MULTIPLY(d1, FIX2(1.387039845));
}
else
{
/* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */
tmp0 = tmp1 = tmp2 = tmp3 = 0;
}
}
}
}
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
dataptr[DCTSIZE*0] = (elem_t) DESCALE(tmp10 + tmp3,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*7] = (elem_t) DESCALE(tmp10 - tmp3,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*1] = (elem_t) DESCALE(tmp11 + tmp2,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*6] = (elem_t) DESCALE(tmp11 - tmp2,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*2] = (elem_t) DESCALE(tmp12 + tmp1,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*5] = (elem_t) DESCALE(tmp12 - tmp1,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*3] = (elem_t) DESCALE(tmp13 + tmp0,
CONST_BITS+PASS1_BITS+3);
dataptr[DCTSIZE*4] = (elem_t) DESCALE(tmp13 - tmp0,
CONST_BITS+PASS1_BITS+3);
dataptr++; /* advance pointer to next column */
} }
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