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FFmpeg/libavcodec/vp3dsp.c

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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 "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] | 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]));
F = M(xC4S4, (ip[0] - ip[4]));
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. */
ip[0] = Gd + Cd ;
ip[7] = Gd - Cd ;
ip[1] = Add + Hd;
ip[2] = Add - Hd;
ip[3] = Ed + Dd ;
ip[4] = Ed - Dd ;
ip[5] = Fd + Bdd;
ip[6] = Fd - Bdd;
}
ip += 8; /* next row */
}
ip = input;
for ( i = 0; i < 8; i++) {
/* Check for non-zero values (bitwise or faster than ||) */
if ( 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])) + 8;
F = M(xC4S4, (ip[0*8] - ip[4*8])) + 8;
if(type==1){ //HACK
E += 16*128;
F += 16*128;
}
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. */
if(type==0){
ip[0*8] = (Gd + Cd ) >> 4;
ip[7*8] = (Gd - Cd ) >> 4;
ip[1*8] = (Add + Hd ) >> 4;
ip[2*8] = (Add - Hd ) >> 4;
ip[3*8] = (Ed + Dd ) >> 4;
ip[4*8] = (Ed - Dd ) >> 4;
ip[5*8] = (Fd + Bdd ) >> 4;
ip[6*8] = (Fd - Bdd ) >> 4;
}else 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==0){
ip[0*8] =
ip[1*8] =
ip[2*8] =
ip[3*8] =
ip[4*8] =
ip[5*8] =
ip[6*8] =
ip[7*8] = ((xC4S4 * ip[0*8] + (IdctAdjustBeforeShift<<16))>>20);
}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*8] + (IdctAdjustBeforeShift<<16))>>20));
}else{
if(ip[0*8]){
int v= ((xC4S4 * ip[0*8] + (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++; /* 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;
c->idct_perm = FF_NO_IDCT_PERM;
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);
}