mirror of
https://github.com/mpv-player/mpv
synced 2024-12-23 15:22:09 +00:00
13fa313b55
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23391 b3059339-0415-0410-9bf9-f77b7e298cf2
342 lines
9.5 KiB
C
342 lines
9.5 KiB
C
/*
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Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <assert.h>
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#include <math.h>
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#include "config.h"
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#include "mp_msg.h"
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#ifdef HAVE_MALLOC_H
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#include <malloc.h>
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#endif
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#include "img_format.h"
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#include "mp_image.h"
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#include "vf.h"
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#define SUB_PIXEL_BITS 8
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#define SUB_PIXELS (1<<SUB_PIXEL_BITS)
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#define COEFF_BITS 11
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//===========================================================================//
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struct vf_priv_s {
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double ref[4][2];
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int32_t coeff[1<<SUB_PIXEL_BITS][4];
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int32_t (*pv)[2];
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int pvStride;
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int cubic;
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};
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/***************************************************************************/
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static void initPv(struct vf_priv_s *priv, int W, int H){
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double a,b,c,d,e,f,g,h,D;
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double (*ref)[2]= priv->ref;
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int x,y;
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g= ( (ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0])*(ref[2][1] - ref[3][1])
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- (ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1])*(ref[2][0] - ref[3][0]))*H;
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h= ( (ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1])*(ref[1][0] - ref[3][0])
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- (ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0])*(ref[1][1] - ref[3][1]))*W;
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D= (ref[1][0] - ref[3][0])*(ref[2][1] - ref[3][1])
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- (ref[2][0] - ref[3][0])*(ref[1][1] - ref[3][1]);
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a= D*(ref[1][0] - ref[0][0])*H + g*ref[1][0];
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b= D*(ref[2][0] - ref[0][0])*W + h*ref[2][0];
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c= D*ref[0][0]*W*H;
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d= D*(ref[1][1] - ref[0][1])*H + g*ref[1][1];
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e= D*(ref[2][1] - ref[0][1])*W + h*ref[2][1];
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f= D*ref[0][1]*W*H;
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for(y=0; y<H; y++){
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for(x=0; x<W; x++){
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int u, v;
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u= (int)floor( SUB_PIXELS*(a*x + b*y + c)/(g*x + h*y + D*W*H) + 0.5);
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v= (int)floor( SUB_PIXELS*(d*x + e*y + f)/(g*x + h*y + D*W*H) + 0.5);
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priv->pv[x + y*W][0]= u;
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priv->pv[x + y*W][1]= v;
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}
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}
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}
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static double getCoeff(double d){
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double A= -0.60;
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double coeff;
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d= fabs(d);
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// Equation is from VirtualDub
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if(d<1.0)
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coeff = (1.0 - (A+3.0)*d*d + (A+2.0)*d*d*d);
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else if(d<2.0)
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coeff = (-4.0*A + 8.0*A*d - 5.0*A*d*d + A*d*d*d);
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else
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coeff=0.0;
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return coeff;
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}
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static int config(struct vf_instance_s* vf,
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int width, int height, int d_width, int d_height,
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unsigned int flags, unsigned int outfmt){
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int i, j;
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vf->priv->pvStride= width;
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vf->priv->pv= (void*)memalign(8, width*height*2*sizeof(int32_t));
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initPv(vf->priv, width, height);
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for(i=0; i<SUB_PIXELS; i++){
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double d= i/(double)SUB_PIXELS;
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double temp[4];
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double sum=0;
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for(j=0; j<4; j++)
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temp[j]= getCoeff(j - d - 1);
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for(j=0; j<4; j++)
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sum+= temp[j];
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for(j=0; j<4; j++)
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vf->priv->coeff[i][j]= (int)floor((1<<COEFF_BITS)*temp[j]/sum + 0.5);
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}
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return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
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}
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static void uninit(struct vf_instance_s* vf){
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if(!vf->priv) return;
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if(vf->priv->pv) free(vf->priv->pv);
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vf->priv->pv= NULL;
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free(vf->priv);
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vf->priv=NULL;
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}
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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){
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int x, y;
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struct vf_priv_s priv= *privParam;
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for(y=0; y<h; y++){
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for(x=0; x<w; x++){
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int u, v, subU, subV, sum, sx, sy;
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sx= x << xShift;
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sy= y << yShift;
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u= priv.pv[sx + sy*priv.pvStride][0]>>xShift;
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v= priv.pv[sx + sy*priv.pvStride][1]>>yShift;
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subU= u & (SUB_PIXELS-1);
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subV= v & (SUB_PIXELS-1);
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u >>= SUB_PIXEL_BITS;
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v >>= SUB_PIXEL_BITS;
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if(u>0 && v>0 && u<w-2 && v<h-2){
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const int index= u + v*srcStride;
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const int a= priv.coeff[subU][0];
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const int b= priv.coeff[subU][1];
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const int c= priv.coeff[subU][2];
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const int d= priv.coeff[subU][3];
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sum=
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priv.coeff[subV][0]*( a*src[index - 1 - srcStride] + b*src[index - 0 - srcStride]
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+ c*src[index + 1 - srcStride] + d*src[index + 2 - srcStride])
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+priv.coeff[subV][1]*( a*src[index - 1 ] + b*src[index - 0 ]
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+ c*src[index + 1 ] + d*src[index + 2 ])
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+priv.coeff[subV][2]*( a*src[index - 1 + srcStride] + b*src[index - 0 + srcStride]
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+ c*src[index + 1 + srcStride] + d*src[index + 2 + srcStride])
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+priv.coeff[subV][3]*( a*src[index - 1+2*srcStride] + b*src[index - 0+2*srcStride]
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+ c*src[index + 1+2*srcStride] + d*src[index + 2+2*srcStride]);
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}else{
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int dx, dy;
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sum=0;
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for(dy=0; dy<4; dy++){
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int iy= v + dy - 1;
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if (iy< 0) iy=0;
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else if(iy>=h) iy=h-1;
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for(dx=0; dx<4; dx++){
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int ix= u + dx - 1;
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if (ix< 0) ix=0;
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else if(ix>=w) ix=w-1;
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sum+= priv.coeff[subU][dx]*priv.coeff[subV][dy]
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*src[ ix + iy*srcStride];
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}
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}
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}
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sum= (sum + (1<<(COEFF_BITS*2-1)) ) >> (COEFF_BITS*2);
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if(sum&~255){
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if(sum<0) sum=0;
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else sum=255;
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}
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dst[ x + y*dstStride]= sum;
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}
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}
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}
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static inline void resampleLinear(uint8_t *dst, uint8_t *src, int w, int h, int dstStride, int srcStride,
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struct vf_priv_s *privParam, int xShift, int yShift){
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int x, y;
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struct vf_priv_s priv= *privParam;
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for(y=0; y<h; y++){
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for(x=0; x<w; x++){
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int u, v, subU, subV, sum, sx, sy, index, subUI, subVI;
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sx= x << xShift;
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sy= y << yShift;
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u= priv.pv[sx + sy*priv.pvStride][0]>>xShift;
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v= priv.pv[sx + sy*priv.pvStride][1]>>yShift;
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subU= u & (SUB_PIXELS-1);
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subV= v & (SUB_PIXELS-1);
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u >>= SUB_PIXEL_BITS;
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v >>= SUB_PIXEL_BITS;
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index= u + v*srcStride;
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subUI= SUB_PIXELS - subU;
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subVI= SUB_PIXELS - subV;
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if((unsigned)u < (unsigned)(w - 1)){
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if((unsigned)v < (unsigned)(h - 1)){
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sum= subVI*(subUI*src[index ] + subU*src[index +1])
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+subV *(subUI*src[index+srcStride] + subU*src[index+srcStride+1]);
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sum= (sum + (1<<(SUB_PIXEL_BITS*2-1)) ) >> (SUB_PIXEL_BITS*2);
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}else{
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if(v<0) v= 0;
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else v= h-1;
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index= u + v*srcStride;
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sum= subUI*src[index] + subU*src[index+1];
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sum= (sum + (1<<(SUB_PIXEL_BITS-1)) ) >> SUB_PIXEL_BITS;
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}
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}else{
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if((unsigned)v < (unsigned)(h - 1)){
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if(u<0) u= 0;
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else u= w-1;
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index= u + v*srcStride;
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sum= subVI*src[index] + subV*src[index+srcStride];
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sum= (sum + (1<<(SUB_PIXEL_BITS-1)) ) >> SUB_PIXEL_BITS;
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}else{
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if(u<0) u= 0;
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else u= w-1;
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if(v<0) v= 0;
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else v= h-1;
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index= u + v*srcStride;
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sum= src[index];
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}
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}
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if(sum&~255){
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if(sum<0) sum=0;
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else sum=255;
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}
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dst[ x + y*dstStride]= sum;
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}
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}
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}
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static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
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int cw= mpi->w >> mpi->chroma_x_shift;
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int ch= mpi->h >> mpi->chroma_y_shift;
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mp_image_t *dmpi=vf_get_image(vf->next,mpi->imgfmt,
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MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
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mpi->w,mpi->h);
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assert(mpi->flags&MP_IMGFLAG_PLANAR);
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if(vf->priv->cubic){
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resampleCubic(dmpi->planes[0], mpi->planes[0], mpi->w,mpi->h, dmpi->stride[0], mpi->stride[0],
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vf->priv, 0, 0);
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resampleCubic(dmpi->planes[1], mpi->planes[1], cw , ch , dmpi->stride[1], mpi->stride[1],
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vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
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resampleCubic(dmpi->planes[2], mpi->planes[2], cw , ch , dmpi->stride[2], mpi->stride[2],
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vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
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}else{
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resampleLinear(dmpi->planes[0], mpi->planes[0], mpi->w,mpi->h, dmpi->stride[0], mpi->stride[0],
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vf->priv, 0, 0);
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resampleLinear(dmpi->planes[1], mpi->planes[1], cw , ch , dmpi->stride[1], mpi->stride[1],
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vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
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resampleLinear(dmpi->planes[2], mpi->planes[2], cw , ch , dmpi->stride[2], mpi->stride[2],
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vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
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}
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return vf_next_put_image(vf,dmpi, pts);
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}
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//===========================================================================//
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static int query_format(struct vf_instance_s* vf, unsigned int fmt){
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switch(fmt)
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{
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case IMGFMT_YV12:
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case IMGFMT_I420:
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case IMGFMT_IYUV:
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case IMGFMT_YVU9:
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case IMGFMT_444P:
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case IMGFMT_422P:
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case IMGFMT_411P:
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return vf_next_query_format(vf, fmt);
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}
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return 0;
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}
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static int open(vf_instance_t *vf, char* args){
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int e;
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vf->config=config;
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vf->put_image=put_image;
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// vf->get_image=get_image;
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vf->query_format=query_format;
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vf->uninit=uninit;
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vf->priv=malloc(sizeof(struct vf_priv_s));
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memset(vf->priv, 0, sizeof(struct vf_priv_s));
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if(args==NULL) return 0;
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e=sscanf(args, "%lf:%lf:%lf:%lf:%lf:%lf:%lf:%lf:%d",
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&vf->priv->ref[0][0], &vf->priv->ref[0][1],
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&vf->priv->ref[1][0], &vf->priv->ref[1][1],
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&vf->priv->ref[2][0], &vf->priv->ref[2][1],
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&vf->priv->ref[3][0], &vf->priv->ref[3][1],
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&vf->priv->cubic
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);
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if(e!=9)
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return 0;
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return 1;
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}
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vf_info_t vf_info_perspective = {
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"perspective correcture",
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"perspective",
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"Michael Niedermayer",
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"",
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open,
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NULL
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};
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//===========================================================================//
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