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mpv/libmpcodecs/vf_perspective.c
diego e0bc115b4d cosmetics: Rename struct vf_instance_s --> vf_instance. 
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@30684 b3059339-0415-0410-9bf9-f77b7e298cf2
2010-02-21 15:48:03 +00:00

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/*
* Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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"
#if HAVE_MALLOC_H
#include <malloc.h>
#endif
#include "img_format.h"
#include "mp_image.h"
#include "vf.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 *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 *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 *vf, mp_image_t *mpi, double pts){
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, pts);
}
//===========================================================================//
static int query_format(struct vf_instance *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 vf_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;
}
const vf_info_t vf_info_perspective = {
"perspective correcture",
"perspective",
"Michael Niedermayer",
"",
vf_open,
NULL
};
//===========================================================================//
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