lavfi: remove dsize libmpcodecs wrapper
[ffmpeg.git] / libavfilter / libmpcodecs / vf_perspective.c
1 /*
2  * Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of MPlayer.
5  *
6  * MPlayer is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * MPlayer is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <inttypes.h>
25 #include <assert.h>
26 #include <math.h>
27
28 #include "config.h"
29 #include "mp_msg.h"
30
31 #if HAVE_MALLOC_H
32 #include <malloc.h>
33 #endif
34
35 #include "libavutil/mem.h"
36
37 #include "img_format.h"
38 #include "mp_image.h"
39 #include "vf.h"
40
41 #define SUB_PIXEL_BITS 8
42 #define SUB_PIXELS (1<<SUB_PIXEL_BITS)
43 #define COEFF_BITS 11
44
45 //===========================================================================//
46
47 struct vf_priv_s {
48     double ref[4][2];
49     int32_t coeff[1<<SUB_PIXEL_BITS][4];
50     int32_t (*pv)[2];
51     int pvStride;
52     int cubic;
53 };
54
55
56 /***************************************************************************/
57
58 static void initPv(struct vf_priv_s *priv, int W, int H){
59     double a,b,c,d,e,f,g,h,D;
60     double (*ref)[2]= priv->ref;
61     int x,y;
62
63     g= (  (ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0])*(ref[2][1] - ref[3][1])
64         - (ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1])*(ref[2][0] - ref[3][0]))*H;
65     h= (  (ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1])*(ref[1][0] - ref[3][0])
66         - (ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0])*(ref[1][1] - ref[3][1]))*W;
67     D=   (ref[1][0] - ref[3][0])*(ref[2][1] - ref[3][1])
68        - (ref[2][0] - ref[3][0])*(ref[1][1] - ref[3][1]);
69
70     a= D*(ref[1][0] - ref[0][0])*H + g*ref[1][0];
71     b= D*(ref[2][0] - ref[0][0])*W + h*ref[2][0];
72     c= D*ref[0][0]*W*H;
73     d= D*(ref[1][1] - ref[0][1])*H + g*ref[1][1];
74     e= D*(ref[2][1] - ref[0][1])*W + h*ref[2][1];
75     f= D*ref[0][1]*W*H;
76
77     for(y=0; y<H; y++){
78         for(x=0; x<W; x++){
79             int u, v;
80
81             u= (int)floor( SUB_PIXELS*(a*x + b*y + c)/(g*x + h*y + D*W*H) + 0.5);
82             v= (int)floor( SUB_PIXELS*(d*x + e*y + f)/(g*x + h*y + D*W*H) + 0.5);
83
84             priv->pv[x + y*W][0]= u;
85             priv->pv[x + y*W][1]= v;
86         }
87     }
88 }
89
90 static double getCoeff(double d){
91     double A= -0.60;
92     double coeff;
93
94     d= fabs(d);
95
96     // Equation is from VirtualDub
97     if(d<1.0)
98         coeff = (1.0 - (A+3.0)*d*d + (A+2.0)*d*d*d);
99     else if(d<2.0)
100         coeff = (-4.0*A + 8.0*A*d - 5.0*A*d*d + A*d*d*d);
101     else
102         coeff=0.0;
103
104     return coeff;
105 }
106
107 static int config(struct vf_instance *vf,
108     int width, int height, int d_width, int d_height,
109     unsigned int flags, unsigned int outfmt){
110     int i, j;
111
112     vf->priv->pvStride= width;
113     vf->priv->pv= av_malloc(width*height*2*sizeof(int32_t));
114     initPv(vf->priv, width, height);
115
116     for(i=0; i<SUB_PIXELS; i++){
117         double d= i/(double)SUB_PIXELS;
118         double temp[4];
119         double sum=0;
120
121         for(j=0; j<4; j++)
122             temp[j]= getCoeff(j - d - 1);
123
124         for(j=0; j<4; j++)
125             sum+= temp[j];
126
127         for(j=0; j<4; j++)
128             vf->priv->coeff[i][j]= (int)floor((1<<COEFF_BITS)*temp[j]/sum + 0.5);
129     }
130
131     return ff_vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
132 }
133
134 static void uninit(struct vf_instance *vf){
135     if(!vf->priv) return;
136
137     av_free(vf->priv->pv);
138     vf->priv->pv= NULL;
139
140     free(vf->priv);
141     vf->priv=NULL;
142 }
143
144 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){
145     int x, y;
146     struct vf_priv_s priv= *privParam;
147
148     for(y=0; y<h; y++){
149         for(x=0; x<w; x++){
150             int u, v, subU, subV, sum, sx, sy;
151
152             sx= x << xShift;
153             sy= y << yShift;
154             u= priv.pv[sx + sy*priv.pvStride][0]>>xShift;
155             v= priv.pv[sx + sy*priv.pvStride][1]>>yShift;
156             subU= u & (SUB_PIXELS-1);
157             subV= v & (SUB_PIXELS-1);
158             u >>= SUB_PIXEL_BITS;
159             v >>= SUB_PIXEL_BITS;
160
161             if(u>0 && v>0 && u<w-2 && v<h-2){
162                 const int index= u + v*srcStride;
163                 const int a= priv.coeff[subU][0];
164                 const int b= priv.coeff[subU][1];
165                 const int c= priv.coeff[subU][2];
166                 const int d= priv.coeff[subU][3];
167
168                 sum=
169                  priv.coeff[subV][0]*(  a*src[index - 1 - srcStride] + b*src[index - 0 - srcStride]
170                                       + c*src[index + 1 - srcStride] + d*src[index + 2 - srcStride])
171                 +priv.coeff[subV][1]*(  a*src[index - 1            ] + b*src[index - 0            ]
172                                       + c*src[index + 1            ] + d*src[index + 2            ])
173                 +priv.coeff[subV][2]*(  a*src[index - 1 + srcStride] + b*src[index - 0 + srcStride]
174                                       + c*src[index + 1 + srcStride] + d*src[index + 2 + srcStride])
175                 +priv.coeff[subV][3]*(  a*src[index - 1+2*srcStride] + b*src[index - 0+2*srcStride]
176                                       + c*src[index + 1+2*srcStride] + d*src[index + 2+2*srcStride]);
177             }else{
178                 int dx, dy;
179                 sum=0;
180
181                 for(dy=0; dy<4; dy++){
182                     int iy= v + dy - 1;
183                     if     (iy< 0) iy=0;
184                     else if(iy>=h) iy=h-1;
185                     for(dx=0; dx<4; dx++){
186                         int ix= u + dx - 1;
187                         if     (ix< 0) ix=0;
188                         else if(ix>=w) ix=w-1;
189
190                         sum+=  priv.coeff[subU][dx]*priv.coeff[subV][dy]
191                               *src[ ix + iy*srcStride];
192                     }
193                 }
194             }
195             sum= (sum + (1<<(COEFF_BITS*2-1)) ) >> (COEFF_BITS*2);
196             if(sum&~255){
197                 if(sum<0) sum=0;
198                 else      sum=255;
199             }
200             dst[ x + y*dstStride]= sum;
201         }
202     }
203 }
204
205 static inline void resampleLinear(uint8_t *dst, uint8_t *src, int w, int h, int dstStride, int srcStride,
206                   struct vf_priv_s *privParam, int xShift, int yShift){
207     int x, y;
208     struct vf_priv_s priv= *privParam;
209
210     for(y=0; y<h; y++){
211         for(x=0; x<w; x++){
212             int u, v, subU, subV, sum, sx, sy, index, subUI, subVI;
213
214             sx= x << xShift;
215             sy= y << yShift;
216             u= priv.pv[sx + sy*priv.pvStride][0]>>xShift;
217             v= priv.pv[sx + sy*priv.pvStride][1]>>yShift;
218             subU= u & (SUB_PIXELS-1);
219             subV= v & (SUB_PIXELS-1);
220             u >>= SUB_PIXEL_BITS;
221             v >>= SUB_PIXEL_BITS;
222             index= u + v*srcStride;
223             subUI= SUB_PIXELS - subU;
224             subVI= SUB_PIXELS - subV;
225
226             if((unsigned)u < (unsigned)(w - 1)){
227                 if((unsigned)v < (unsigned)(h - 1)){
228                     sum= subVI*(subUI*src[index          ] + subU*src[index          +1])
229                         +subV *(subUI*src[index+srcStride] + subU*src[index+srcStride+1]);
230                     sum= (sum + (1<<(SUB_PIXEL_BITS*2-1)) ) >> (SUB_PIXEL_BITS*2);
231                 }else{
232                     if(v<0) v= 0;
233                     else    v= h-1;
234                     index= u + v*srcStride;
235                     sum= subUI*src[index] + subU*src[index+1];
236                     sum= (sum + (1<<(SUB_PIXEL_BITS-1)) ) >> SUB_PIXEL_BITS;
237                 }
238             }else{
239                 if((unsigned)v < (unsigned)(h - 1)){
240                     if(u<0) u= 0;
241                     else    u= w-1;
242                     index= u + v*srcStride;
243                     sum= subVI*src[index] + subV*src[index+srcStride];
244                     sum= (sum + (1<<(SUB_PIXEL_BITS-1)) ) >> SUB_PIXEL_BITS;
245                 }else{
246                     if(u<0) u= 0;
247                     else    u= w-1;
248                     if(v<0) v= 0;
249                     else    v= h-1;
250                     index= u + v*srcStride;
251                     sum= src[index];
252                 }
253             }
254             if(sum&~255){
255                 if(sum<0) sum=0;
256                 else      sum=255;
257             }
258             dst[ x + y*dstStride]= sum;
259         }
260     }
261 }
262
263 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
264     int cw= mpi->w >> mpi->chroma_x_shift;
265     int ch= mpi->h >> mpi->chroma_y_shift;
266
267     mp_image_t *dmpi=ff_vf_get_image(vf->next,mpi->imgfmt,
268         MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
269         mpi->w,mpi->h);
270
271     assert(mpi->flags&MP_IMGFLAG_PLANAR);
272
273     if(vf->priv->cubic){
274         resampleCubic(dmpi->planes[0], mpi->planes[0], mpi->w,mpi->h, dmpi->stride[0], mpi->stride[0],
275                 vf->priv, 0, 0);
276         resampleCubic(dmpi->planes[1], mpi->planes[1], cw    , ch   , dmpi->stride[1], mpi->stride[1],
277                 vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
278         resampleCubic(dmpi->planes[2], mpi->planes[2], cw    , ch   , dmpi->stride[2], mpi->stride[2],
279                 vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
280     }else{
281         resampleLinear(dmpi->planes[0], mpi->planes[0], mpi->w,mpi->h, dmpi->stride[0], mpi->stride[0],
282                 vf->priv, 0, 0);
283         resampleLinear(dmpi->planes[1], mpi->planes[1], cw    , ch   , dmpi->stride[1], mpi->stride[1],
284                 vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
285         resampleLinear(dmpi->planes[2], mpi->planes[2], cw    , ch   , dmpi->stride[2], mpi->stride[2],
286                 vf->priv, mpi->chroma_x_shift, mpi->chroma_y_shift);
287     }
288
289     return ff_vf_next_put_image(vf,dmpi, pts);
290 }
291
292 //===========================================================================//
293
294 static int query_format(struct vf_instance *vf, unsigned int fmt){
295     switch(fmt)
296     {
297     case IMGFMT_YV12:
298     case IMGFMT_I420:
299     case IMGFMT_IYUV:
300     case IMGFMT_YVU9:
301     case IMGFMT_444P:
302     case IMGFMT_422P:
303     case IMGFMT_411P:
304         return ff_vf_next_query_format(vf, fmt);
305     }
306     return 0;
307 }
308
309 static int vf_open(vf_instance_t *vf, char *args){
310     int e;
311
312     vf->config=config;
313     vf->put_image=put_image;
314 //  vf->get_image=get_image;
315     vf->query_format=query_format;
316     vf->uninit=uninit;
317     vf->priv=malloc(sizeof(struct vf_priv_s));
318     memset(vf->priv, 0, sizeof(struct vf_priv_s));
319
320     if(args==NULL) return 0;
321
322     e=sscanf(args, "%lf:%lf:%lf:%lf:%lf:%lf:%lf:%lf:%d",
323         &vf->priv->ref[0][0], &vf->priv->ref[0][1],
324         &vf->priv->ref[1][0], &vf->priv->ref[1][1],
325         &vf->priv->ref[2][0], &vf->priv->ref[2][1],
326         &vf->priv->ref[3][0], &vf->priv->ref[3][1],
327         &vf->priv->cubic
328         );
329
330     if(e!=9)
331         return 0;
332
333     return 1;
334 }
335
336 const vf_info_t ff_vf_info_perspective = {
337     "perspective correcture",
338     "perspective",
339     "Michael Niedermayer",
340     "",
341     vf_open,
342     NULL
343 };
344
345 //===========================================================================//