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FFmpeg/libavcodec/vp3dsp.c
Ronald S. Bultje 015821229f vp3: Use full transpose for all IDCTs 
This way, the special IDCT permutations are no longer needed. This
is similar to how H264 does it, and removes the dsputil dependency
imposed by the scantable code.

Also remove the unused type == 0 cases from the plain C version
of the idct.

Signed-off-by: Martin Storsjö <martin@martin.st>
2013-04-15 12:32:05 +03:00

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/*
* Copyright (C) 2004 the ffmpeg project
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Standard C DSP-oriented functions cribbed from the original VP3
* source code.
*/
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "dsputil.h"
#include "rnd_avg.h"
#include "vp3dsp.h"
#define IdctAdjustBeforeShift 8
#define xC1S7 64277
#define xC2S6 60547
#define xC3S5 54491
#define xC4S4 46341
#define xC5S3 36410
#define xC6S2 25080
#define xC7S1 12785
#define M(a,b) (((a) * (b))>>16)
static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)
{
int16_t *ip = input;
int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;
int Ed, Gd, Add, Bdd, Fd, Hd;
int i;
/* Inverse DCT on the rows now */
for (i = 0; i < 8; i++) {
/* Check for non-zero values */
if ( ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |
ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8] ) {
A = M(xC1S7, ip[1 * 8]) + M(xC7S1, ip[7 * 8]);
B = M(xC7S1, ip[1 * 8]) - M(xC1S7, ip[7 * 8]);
C = M(xC3S5, ip[3 * 8]) + M(xC5S3, ip[5 * 8]);
D = M(xC3S5, ip[5 * 8]) - M(xC5S3, ip[3 * 8]);
Ad = M(xC4S4, (A - C));
Bd = M(xC4S4, (B - D));
Cd = A + C;
Dd = B + D;
E = M(xC4S4, (ip[0 * 8] + ip[4 * 8]));
F = M(xC4S4, (ip[0 * 8] - ip[4 * 8]));
G = M(xC2S6, ip[2 * 8]) + M(xC6S2, ip[6 * 8]);
H = M(xC6S2, ip[2 * 8]) - M(xC2S6, ip[6 * 8]);
Ed = E - G;
Gd = E + G;
Add = F + Ad;
Bdd = Bd - H;
Fd = F - Ad;
Hd = Bd + H;
/* Final sequence of operations over-write original inputs. */
ip[0 * 8] = Gd + Cd ;
ip[7 * 8] = Gd - Cd ;
ip[1 * 8] = Add + Hd;
ip[2 * 8] = Add - Hd;
ip[3 * 8] = Ed + Dd ;
ip[4 * 8] = Ed - Dd ;
ip[5 * 8] = Fd + Bdd;
ip[6 * 8] = Fd - Bdd;
}
ip += 1; /* next row */
}
ip = input;
for ( i = 0; i < 8; i++) {
/* Check for non-zero values (bitwise or faster than ||) */
if ( ip[1] | ip[2] | ip[3] |
ip[4] | ip[5] | ip[6] | ip[7] ) {
A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);
B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);
C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);
D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);
Ad = M(xC4S4, (A - C));
Bd = M(xC4S4, (B - D));
Cd = A + C;
Dd = B + D;
E = M(xC4S4, (ip[0] + ip[4])) + 8;
F = M(xC4S4, (ip[0] - ip[4])) + 8;
if(type==1){ //HACK
E += 16*128;
F += 16*128;
}
G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);
H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);
Ed = E - G;
Gd = E + G;
Add = F + Ad;
Bdd = Bd - H;
Fd = F - Ad;
Hd = Bd + H;
/* Final sequence of operations over-write original inputs. */
if (type == 1) {
dst[0*stride] = av_clip_uint8((Gd + Cd ) >> 4);
dst[7*stride] = av_clip_uint8((Gd - Cd ) >> 4);
dst[1*stride] = av_clip_uint8((Add + Hd ) >> 4);
dst[2*stride] = av_clip_uint8((Add - Hd ) >> 4);
dst[3*stride] = av_clip_uint8((Ed + Dd ) >> 4);
dst[4*stride] = av_clip_uint8((Ed - Dd ) >> 4);
dst[5*stride] = av_clip_uint8((Fd + Bdd ) >> 4);
dst[6*stride] = av_clip_uint8((Fd - Bdd ) >> 4);
}else{
dst[0*stride] = av_clip_uint8(dst[0*stride] + ((Gd + Cd ) >> 4));
dst[7*stride] = av_clip_uint8(dst[7*stride] + ((Gd - Cd ) >> 4));
dst[1*stride] = av_clip_uint8(dst[1*stride] + ((Add + Hd ) >> 4));
dst[2*stride] = av_clip_uint8(dst[2*stride] + ((Add - Hd ) >> 4));
dst[3*stride] = av_clip_uint8(dst[3*stride] + ((Ed + Dd ) >> 4));
dst[4*stride] = av_clip_uint8(dst[4*stride] + ((Ed - Dd ) >> 4));
dst[5*stride] = av_clip_uint8(dst[5*stride] + ((Fd + Bdd ) >> 4));
dst[6*stride] = av_clip_uint8(dst[6*stride] + ((Fd - Bdd ) >> 4));
}
} else {
if (type == 1) {
dst[0*stride]=
dst[1*stride]=
dst[2*stride]=
dst[3*stride]=
dst[4*stride]=
dst[5*stride]=
dst[6*stride]=
dst[7*stride]= av_clip_uint8(128 + ((xC4S4 * ip[0] + (IdctAdjustBeforeShift<<16))>>20));
}else{
if(ip[0]){
int v= ((xC4S4 * ip[0] + (IdctAdjustBeforeShift<<16))>>20);
dst[0*stride] = av_clip_uint8(dst[0*stride] + v);
dst[1*stride] = av_clip_uint8(dst[1*stride] + v);
dst[2*stride] = av_clip_uint8(dst[2*stride] + v);
dst[3*stride] = av_clip_uint8(dst[3*stride] + v);
dst[4*stride] = av_clip_uint8(dst[4*stride] + v);
dst[5*stride] = av_clip_uint8(dst[5*stride] + v);
dst[6*stride] = av_clip_uint8(dst[6*stride] + v);
dst[7*stride] = av_clip_uint8(dst[7*stride] + v);
}
}
}
ip += 8; /* next column */
dst++;
}
}
static void vp3_idct_put_c(uint8_t *dest/*align 8*/, int line_size,
int16_t *block/*align 16*/)
{
idct(dest, line_size, block, 1);
memset(block, 0, sizeof(*block) * 64);
}
static void vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size,
int16_t *block/*align 16*/)
{
idct(dest, line_size, block, 2);
memset(block, 0, sizeof(*block) * 64);
}
static void vp3_idct_dc_add_c(uint8_t *dest/*align 8*/, int line_size,
int16_t *block/*align 16*/)
{
int i, dc = (block[0] + 15) >> 5;
for(i = 0; i < 8; i++){
dest[0] = av_clip_uint8(dest[0] + dc);
dest[1] = av_clip_uint8(dest[1] + dc);
dest[2] = av_clip_uint8(dest[2] + dc);
dest[3] = av_clip_uint8(dest[3] + dc);
dest[4] = av_clip_uint8(dest[4] + dc);
dest[5] = av_clip_uint8(dest[5] + dc);
dest[6] = av_clip_uint8(dest[6] + dc);
dest[7] = av_clip_uint8(dest[7] + dc);
dest += line_size;
}
block[0] = 0;
}
static void vp3_v_loop_filter_c(uint8_t *first_pixel, int stride,
int *bounding_values)
{
unsigned char *end;
int filter_value;
const int nstride= -stride;
for (end= first_pixel + 8; first_pixel < end; first_pixel++) {
filter_value =
(first_pixel[2 * nstride] - first_pixel[ stride])
+3*(first_pixel[0 ] - first_pixel[nstride]);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[nstride] = av_clip_uint8(first_pixel[nstride] + filter_value);
first_pixel[0] = av_clip_uint8(first_pixel[0] - filter_value);
}
}
static void vp3_h_loop_filter_c(uint8_t *first_pixel, int stride,
int *bounding_values)
{
unsigned char *end;
int filter_value;
for (end= first_pixel + 8*stride; first_pixel != end; first_pixel += stride) {
filter_value =
(first_pixel[-2] - first_pixel[ 1])
+3*(first_pixel[ 0] - first_pixel[-1]);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[-1] = av_clip_uint8(first_pixel[-1] + filter_value);
first_pixel[ 0] = av_clip_uint8(first_pixel[ 0] - filter_value);
}
}
static void put_no_rnd_pixels_l2(uint8_t *dst, const uint8_t *src1,
const uint8_t *src2, ptrdiff_t stride, int h)
{
int i;
for (i = 0; i < h; i++) {
uint32_t a, b;
a = AV_RN32(&src1[i * stride]);
b = AV_RN32(&src2[i * stride]);
AV_WN32A(&dst[i * stride], no_rnd_avg32(a, b));
a = AV_RN32(&src1[i * stride + 4]);
b = AV_RN32(&src2[i * stride + 4]);
AV_WN32A(&dst[i * stride + 4], no_rnd_avg32(a, b));
}
}
av_cold void ff_vp3dsp_init(VP3DSPContext *c, int flags)
{
c->put_no_rnd_pixels_l2 = put_no_rnd_pixels_l2;
c->idct_put = vp3_idct_put_c;
c->idct_add = vp3_idct_add_c;
c->idct_dc_add = vp3_idct_dc_add_c;
c->v_loop_filter = vp3_v_loop_filter_c;
c->h_loop_filter = vp3_h_loop_filter_c;
if (ARCH_ARM)
ff_vp3dsp_init_arm(c, flags);
if (ARCH_BFIN)
ff_vp3dsp_init_bfin(c, flags);
if (ARCH_PPC)
ff_vp3dsp_init_ppc(c, flags);
if (ARCH_X86)
ff_vp3dsp_init_x86(c, flags);
}
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