git.sesse.net Git - ffmpeg/blob - libavfilter/libmpcodecs/vf_mirror.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <inttypes.h>
  23
  24 #include "config.h"
  25 #include "mp_msg.h"
  26
  27 #include "img_format.h"
  28 #include "mp_image.h"
  29 #include "vf.h"
  30
  31
  32 static void mirror(unsigned char* dst,unsigned char* src,int dststride,int srcstride,int w,int h,int bpp,unsigned int fmt){
  33     int y;
  34     for(y=0;y<h;y++){
  35         int x;
  36         switch(bpp){
  37         case 1:
  38             for(x=0;x<w;x++) dst[x]=src[w-x-1];
  39             break;
  40         case 2:
  41             switch(fmt){
  42             case IMGFMT_UYVY: {
  43                 // packed YUV is tricky. U,V are 32bpp while Y is 16bpp:
  44                 int w2=w>>1;
  45                 for(x=0;x<w2;x++){
  46                     // TODO: optimize this...
  47                     dst[x*4+0]=src[0+(w2-x-1)*4];
  48                     dst[x*4+1]=src[3+(w2-x-1)*4];
  49                     dst[x*4+2]=src[2+(w2-x-1)*4];
  50                     dst[x*4+3]=src[1+(w2-x-1)*4];
  51                 }
  52                 break; }
  53             case IMGFMT_YUY2:
  54             case IMGFMT_YVYU: {
  55                 // packed YUV is tricky. U,V are 32bpp while Y is 16bpp:
  56                 int w2=w>>1;
  57                 for(x=0;x<w2;x++){
  58                     // TODO: optimize this...
  59                     dst[x*4+0]=src[2+(w2-x-1)*4];
  60                     dst[x*4+1]=src[1+(w2-x-1)*4];
  61                     dst[x*4+2]=src[0+(w2-x-1)*4];
  62                     dst[x*4+3]=src[3+(w2-x-1)*4];
  63                 }
  64                 break; }
  65             default:
  66                 for(x=0;x<w;x++) *((short*)(dst+x*2))=*((short*)(src+(w-x-1)*2));
  67             }
  68             break;
  69         case 3:
  70             for(x=0;x<w;x++){
  71                 dst[x*3+0]=src[0+(w-x-1)*3];
  72                 dst[x*3+1]=src[1+(w-x-1)*3];
  73                 dst[x*3+2]=src[2+(w-x-1)*3];
  74             }
  75             break;
  76         case 4:
  77             for(x=0;x<w;x++) *((int*)(dst+x*4))=*((int*)(src+(w-x-1)*4));
  78         }
  79         src+=srcstride;
  80         dst+=dststride;
  81     }
  82 }
  83
  84 //===========================================================================//
  85
  86 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
  87     mp_image_t *dmpi;
  88
  89     // hope we'll get DR buffer:
  90     dmpi=vf_get_image(vf->next,mpi->imgfmt,
  91         MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
  92         mpi->w, mpi->h);
  93
  94     if(mpi->flags&MP_IMGFLAG_PLANAR){
  95                mirror(dmpi->planes[0],mpi->planes[0],
  96                dmpi->stride[0],mpi->stride[0],
  97                dmpi->w,dmpi->h,1,mpi->imgfmt);
  98                mirror(dmpi->planes[1],mpi->planes[1],
  99                dmpi->stride[1],mpi->stride[1],
 100                dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,mpi->imgfmt);
 101                mirror(dmpi->planes[2],mpi->planes[2],
 102                dmpi->stride[2],mpi->stride[2],
 103                dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,mpi->imgfmt);
 104     } else {
 105         mirror(dmpi->planes[0],mpi->planes[0],
 106                dmpi->stride[0],mpi->stride[0],
 107                dmpi->w,dmpi->h,dmpi->bpp>>3,mpi->imgfmt);
 108         dmpi->planes[1]=mpi->planes[1]; // passthrough rgb8 palette
 109     }
 110
 111     return vf_next_put_image(vf,dmpi, pts);
 112 }
 113
 114 //===========================================================================//
 115
 116 static int vf_open(vf_instance_t *vf, char *args){
 117     //vf->config=config;
 118     vf->put_image=put_image;
 119     return 1;
 120 }
 121
 122 const vf_info_t vf_info_mirror = {
 123     "horizontal mirror",
 124     "mirror",
 125     "Eyck",
 126     "",
 127     vf_open,
 128     NULL
 129 };
 130
 131 //===========================================================================//