libmpcodecs/vf_mirror.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <inttypes.h>
   5
   6 #include "config.h"
   7 #include "mp_msg.h"
   8
   9 #include "img_format.h"
  10 #include "mp_image.h"
  11 #include "vf.h"
  12
  13
  14 static void mirror(unsigned char* dst,unsigned char* src,int dststride,int srcstride,int w,int h,int bpp,unsigned int fmt){
  15     int y;
  16     for(y=0;y<h;y++){
  17         int x;
  18         switch(bpp){
  19         case 1:
  20             for(x=0;x<w;x++) dst[x]=src[w-x-1];
  21             break;
  22         case 2:
  23             switch(fmt){
  24             case IMGFMT_UYVY: {
  25                 // packed YUV is tricky. U,V are 32bpp while Y is 16bpp:
  26                 int w2=w>>1;
  27                 for(x=0;x<w2;x++){
  28                     // TODO: optimize this...
  29                     dst[x*4+0]=src[0+(w2-x-1)*4];
  30                     dst[x*4+1]=src[3+(w2-x-1)*4];
  31                     dst[x*4+2]=src[2+(w2-x-1)*4];
  32                     dst[x*4+3]=src[1+(w2-x-1)*4];
  33                 }
  34                 break; }
  35             case IMGFMT_YUY2:
  36             case IMGFMT_YVYU: {
  37                 // packed YUV is tricky. U,V are 32bpp while Y is 16bpp:
  38                 int w2=w>>1;
  39                 for(x=0;x<w2;x++){
  40                     // TODO: optimize this...
  41                     dst[x*4+0]=src[2+(w2-x-1)*4];
  42                     dst[x*4+1]=src[1+(w2-x-1)*4];
  43                     dst[x*4+2]=src[0+(w2-x-1)*4];
  44                     dst[x*4+3]=src[3+(w2-x-1)*4];
  45                 }
  46                 break; }
  47             default:
  48                 for(x=0;x<w;x++) *((short*)(dst+x*2))=*((short*)(src+(w-x-1)*2));
  49             }
  50             break;
  51         case 3:
  52             for(x=0;x<w;x++){
  53                 dst[x*3+0]=src[0+(w-x-1)*3];
  54                 dst[x*3+1]=src[1+(w-x-1)*3];
  55                 dst[x*3+2]=src[2+(w-x-1)*3];
  56             }
  57             break;
  58         case 4:
  59             for(x=0;x<w;x++) *((int*)(dst+x*4))=*((int*)(src+(w-x-1)*4));
  60         }
  61         src+=srcstride;
  62         dst+=dststride;
  63     }
  64 }
  65
  66 //===========================================================================//
  67
  68 static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
  69     mp_image_t *dmpi;
  70
  71     // hope we'll get DR buffer:
  72     dmpi=vf_get_image(vf->next,mpi->imgfmt,
  73         MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
  74         mpi->w, mpi->h);
  75
  76     if(mpi->flags&MP_IMGFLAG_PLANAR){
  77                mirror(dmpi->planes[0],mpi->planes[0],
  78                dmpi->stride[0],mpi->stride[0],
  79                dmpi->w,dmpi->h,1,mpi->imgfmt);
  80                mirror(dmpi->planes[1],mpi->planes[1],
  81                dmpi->stride[1],mpi->stride[1],
  82                dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,mpi->imgfmt);
  83                mirror(dmpi->planes[2],mpi->planes[2],
  84                dmpi->stride[2],mpi->stride[2],
  85                dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,mpi->imgfmt);
  86     } else {
  87         mirror(dmpi->planes[0],mpi->planes[0],
  88                dmpi->stride[0],mpi->stride[0],
  89                dmpi->w,dmpi->h,dmpi->bpp>>3,mpi->imgfmt);
  90         dmpi->planes[1]=mpi->planes[1]; // passthrough rgb8 palette
  91     }
  92
  93     return vf_next_put_image(vf,dmpi, pts);
  94 }
  95
  96 //===========================================================================//
  97
  98 static int open(vf_instance_t *vf, char* args){
  99     //vf->config=config;
 100     vf->put_image=put_image;
 101     return 1;
 102 }
 103
 104 const vf_info_t vf_info_mirror = {
 105     "horizontal mirror",
 106     "mirror",
 107     "Eyck",
 108     "",
 109     open,
 110     NULL
 111 };
 112
 113 //===========================================================================//