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mpv/libmpcodecs/vf_perspective.c
albeu 33b62af947 Add the new -vf option wich is the same as vop in reverse order. 
Syntax is we decided, so you can give the nomes or not with both
vop and vf. vf take precedence over vop.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9594 b3059339-0415-0410-9bf9-f77b7e298cf2
2003-03-15 18:01:02 +00:00

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/*
Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include <math.h>
#include "../config.h"
#include "../mp_msg.h"
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#include "../libvo/fastmemcpy.h"
#define SUB_PIXEL_BITS 8
#define SUB_PIXELS (1<<SUB_PIXEL_BITS)
#define COEFF_BITS 11
//===========================================================================//
struct vf_priv_s {
double ref[4][2];
int32_t coeff[1<<SUB_PIXEL_BITS][4];
int32_t (*pv)[2];
int pvStride;
int cubic;
};
/***************************************************************************/
static void initPv(struct vf_priv_s *priv, int W, int H){
double a,b,c,d,e,f,g,h,D;
double (*ref)[2]= priv->ref;
int x,y;
g= ( (ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0])*(ref[2][1] - ref[3][1])
- (ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1])*(ref[2][0] - ref[3][0]))*H;
h= ( (ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1])*(ref[1][0] - ref[3][0])
- (ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0])*(ref[1][1] - ref[3][1]))*W;
D= (ref[1][0] - ref[3][0])*(ref[2][1] - ref[3][1])
- (ref[2][0] - ref[3][0])*(ref[1][1] - ref[3][1]);
a= D*(ref[1][0] - ref[0][0])*H + g*ref[1][0];
b= D*(ref[2][0] - ref[0][0])*W + h*ref[2][0];
c= D*ref[0][0]*W*H;
d= D*(ref[1][1] - ref[0][1])*H + g*ref[1][1];
e= D*(ref[2][1] - ref[0][1])*W + h*ref[2][1];
f= D*ref[0][1]*W*H;
for(y=0; y<H; y++){
for(x=0; x<W; x++){
int u, v;
u= (int)floor( SUB_PIXELS*(a*x + b*y + c)/(g*x + h*y + D*W*H) + 0.5);
v= (int)floor( SUB_PIXELS*(d*x + e*y + f)/(g*x + h*y + D*W*H) + 0.5);
priv->pv[x + y*W][0]= u;
priv->pv[x + y*W][1]= v;
}
}
}
static double getCoeff(double d){
double A= -0.60;
double coeff;
d= fabs(d);
// Equation is from VirtualDub
if(d<1.0)
coeff = (1.0 - (A+3.0)*d*d + (A+2.0)*d*d*d);
else if(d<2.0)
coeff = (-4.0*A + 8.0*A*d - 5.0*A*d*d + A*d*d*d);
else
coeff=0.0;
return coeff;
}
static int config(struct vf_instance_s* vf,
int width, int height, int d_width, int d_height,
unsigned int flags, unsigned int outfmt){
int i, j;
vf->priv->pvStride= width;
vf->priv->pv= (void*)memalign(8, width*height*2*sizeof(int32_t));
initPv(vf->priv, width, height);
for(i=0; i<SUB_PIXELS; i++){
double d= i/(double)SUB_PIXELS;
double temp[4];
double sum=0;
for(j=0; j<4; j++)
temp[j]= getCoeff(j - d - 1);
for(j=0; j<4; j++)
sum+= temp[j];
for(j=0; j<4; j++)
vf->priv->coeff[i][j]= (int)floor((1<<COEFF_BITS)*temp[j]/sum + 0.5);
}
return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}
static void uninit(struct vf_instance_s* vf){
if(!vf->priv) return;
if(vf->priv->pv) free(vf->priv->pv);
vf->priv->pv= NULL;
free(vf->priv);
vf->priv=NULL;
}
static inline void resampleCubic(uint8_t *dst, uint8_t *src, int w, int h, int dstStride, int srcStride, struct vf_priv_s *privParam, int xShift, int yShift){
int x, y;
struct vf_priv_s priv= *privParam;
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int u, v, subU, subV, sum, sx, sy;
sx= x << xShift;
sy= y << yShift;
u= priv.pv[sx + sy*priv.pvStride][0]>>xShift;
v= priv.pv[sx + sy*priv.pvStride][1]>>yShift;
subU= u & (SUB_PIXELS-1);
subV= v & (SUB_PIXELS-1);
u >>= SUB_PIXEL_BITS;
v >>= SUB_PIXEL_BITS;
if(u>0 && v>0 && u<w-2 && v<h-2){
const int index= u + v*srcStride;
const int a= priv.coeff[subU][0];
const int b= priv.coeff[subU][1];
const int c= priv.coeff[subU][2];
const int d= priv.coeff[subU][3];
sum=
priv.coeff[subV][0]*( a*src[index - 1 - srcStride] + b*src[index - 0 - srcStride]
+ c*src[index + 1 - srcStride] + d*src[index + 2 - srcStride])
+priv.coeff[subV][1]*( a*src[index - 1 ] + b*src[index - 0 ]
+ c*src[index + 1 ] + d*src[index + 2 ])
+priv.coeff[subV][2]*( a*src[index - 1 + srcStride] + b*src[index - 0 + srcStride]
+ c*src[index + 1 + srcStride] + d*src[index + 2 + srcStride])
+priv.coeff[subV][3]*( a*src[index - 1+2*srcStride] + b*src[index - 0+2*srcStride]
+ c*src[index + 1+2*srcStride] + d*src[index + 2+2*srcStride]);
}else{
int dx, dy;
sum=0;
for(dy=0; dy<4; dy++){
int iy= v + dy - 1;
if (iy< 0) iy=0;
else if(iy>=h) iy=h-1;
for(dx=0; dx<4; dx++){
int ix= u + dx - 1;
if (ix< 0) ix=0;
else if(ix>=w) ix=w-1;
sum+= priv.coeff[subU][dx]*priv.coeff[subV][dy]
*src[ ix + iy*srcStride];
}
}
}
sum= (sum + (1<<(COEFF_BITS*2-1)) ) >> (COEFF_BITS*2);
if(sum&~255){
if(sum<0) sum=0;
else sum=255;
}
dst[ x + y*dstStride]= sum;
}
}
}
static inline void resampleLinear(uint8_t *dst, uint8_t *src, int w, int h, int dstStride, int srcStride,
struct vf_priv_s *privParam, int xShift, int yShift){
int x, y;
struct vf_priv_s priv= *privParam;
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int u, v, subU, subV, sum, sx, sy, index, subUI, subVI;
sx= x << xShift;
sy= y << yShift;
u= priv.pv[sx + sy*priv.pvStride][0]>>xShift;
v= priv.pv[sx + sy*priv.pvStride][1]>>yShift;
subU= u & (SUB_PIXELS-1);
subV= v & (SUB_PIXELS-1);
u >>= SUB_PIXEL_BITS;
v >>= SUB_PIXEL_BITS;
index= u + v*srcStride;
subUI= SUB_PIXELS - subU;
subVI= SUB_PIXELS - subV;
if((unsigned)u < (unsigned)(w - 1)){
if((unsigned)v < (unsigned)(h - 1)){
sum= subVI*(subUI*src[index ] + subU*src[index +1])
+subV *(subUI*src[index+srcStride] + subU*src[index+srcStride+1]);
sum= (sum + (1<<(SUB_PIXEL_BITS*2-1)) ) >> (SUB_PIXEL_BITS*2);
}else{
if(v<0) v= 0;
else v= h-1;
index= u + v*srcStride;
sum= subUI*src[index] + subU*src[index+1];
sum= (sum + (1<<(SUB_PIXEL_BITS-1)) ) >> SUB_PIXEL_BITS;
}
}else{
if((unsigned)v < (unsigned)(h - 1)){
if(u<0) u= 0;
else u= w-1;
index= u + v*srcStride;
sum= subVI*src[index] + subV*src[index+srcStride];
sum= (sum + (1<<(SUB_PIXEL_BITS-1)) ) >> SUB_PIXEL_BITS;
}else{
if(u<0) u= 0;
else u= w-1;
if(v<0) v= 0;
else v= h-1;
index= u + v*srcStride;
sum= src[index];
}
}
if(sum&~255){
if(sum<0) sum=0;
else sum=255;
}
dst[ x + y*dstStride]= sum;
}
}
}
static int put_image(struct vf_instance_s* vf, mp_image_t *mpi){
int cw= mpi->w >> mpi->chroma_x_shift;
int ch= mpi->h >> mpi->chroma_y_shift;
mp_image_t *dmpi=vf_get_image(vf->next,mpi->imgfmt,
MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
mpi->w,mpi->h);
assert(mpi->flags&MP_IMGFLAG_PLANAR);
if(vf->priv->cubic){
resampleCubic(dmpi->planes[0], mpi->planes[0], mpi->w,mpi->h, dmpi->stride[0], mpi->stride[0],
vf->priv, 0, 0);
resampleCubic(dmpi->planes[1], mpi->planes[1], cw , ch , dmpi->stride[1], mpi->stride[1],
vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
resampleCubic(dmpi->planes[2], mpi->planes[2], cw , ch , dmpi->stride[2], mpi->stride[2],
vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
}else{
resampleLinear(dmpi->planes[0], mpi->planes[0], mpi->w,mpi->h, dmpi->stride[0], mpi->stride[0],
vf->priv, 0, 0);
resampleLinear(dmpi->planes[1], mpi->planes[1], cw , ch , dmpi->stride[1], mpi->stride[1],
vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
resampleLinear(dmpi->planes[2], mpi->planes[2], cw , ch , dmpi->stride[2], mpi->stride[2],
vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
}
return vf_next_put_image(vf,dmpi);
}
//===========================================================================//
static int query_format(struct vf_instance_s* vf, unsigned int fmt){
switch(fmt)
{
case IMGFMT_YV12:
case IMGFMT_I420:
case IMGFMT_IYUV:
case IMGFMT_YVU9:
case IMGFMT_444P:
case IMGFMT_422P:
case IMGFMT_411P:
return vf_next_query_format(vf, fmt);
}
return 0;
}
static int open(vf_instance_t *vf, char* args){
int e;
vf->config=config;
vf->put_image=put_image;
// vf->get_image=get_image;
vf->query_format=query_format;
vf->uninit=uninit;
vf->priv=malloc(sizeof(struct vf_priv_s));
memset(vf->priv, 0, sizeof(struct vf_priv_s));
if(args==NULL) return 0;
e=sscanf(args, "%lf:%lf:%lf:%lf:%lf:%lf:%lf:%lf:%d",
&vf->priv->ref[0][0], &vf->priv->ref[0][1],
&vf->priv->ref[1][0], &vf->priv->ref[1][1],
&vf->priv->ref[2][0], &vf->priv->ref[2][1],
&vf->priv->ref[3][0], &vf->priv->ref[3][1],
&vf->priv->cubic
);
if(e!=9)
return 0;
return 1;
}
vf_info_t vf_info_perspective = {
"perspective correcture",
"perspective",
"Michael Niedermayer",
"",
open,
NULL
};
//===========================================================================//
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