libmpcodecs/vf_field.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include "../config.h"
   6 #include "../mp_msg.h"
   7
   8 #include "mp_image.h"
   9 #include "vf.h"
  10
  11 #include "../libvo/fastmemcpy.h"
  12
  13 struct vf_priv_s {
  14     int field;
  15 };
  16
  17 //===========================================================================//
  18
  19 static int config(struct vf_instance_s* vf,
  20         int width, int height, int d_width, int d_height,
  21         unsigned int flags, unsigned int outfmt){
  22     return vf_next_config(vf,width,height/2,d_width,d_height,flags,outfmt);
  23 }
  24
  25 static int put_image(struct vf_instance_s* vf, mp_image_t *mpi){
  26     if(mpi->flags&MP_IMGFLAG_DIRECT){
  27         // we've used DR, so we're ready...
  28         return vf_next_put_image(vf,(mp_image_t*)mpi->priv);
  29     }
  30
  31     vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
  32         MP_IMGTYPE_EXPORT, MP_IMGFLAG_ACCEPT_STRIDE,
  33         mpi->width, mpi->height/2);
  34
  35     // set up mpi as a double-stride image of dmpi:
  36     vf->dmpi->planes[0]=mpi->planes[0]+mpi->stride[0]*vf->priv->field;
  37     vf->dmpi->stride[0]=2*mpi->stride[0];
  38     if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
  39         vf->dmpi->planes[1]=mpi->planes[1]+
  40             mpi->stride[1]*vf->priv->field;
  41         vf->dmpi->stride[1]=2*mpi->stride[1];
  42         vf->dmpi->planes[2]=mpi->planes[2]+
  43             mpi->stride[2]*vf->priv->field;
  44         vf->dmpi->stride[2]=2*mpi->stride[2];
  45     } else
  46         vf->dmpi->planes[1]=mpi->planes[1]; // passthru bgr8 palette!!!
  47
  48     return vf_next_put_image(vf,vf->dmpi);
  49 }
  50
  51 //===========================================================================//
  52
  53 static void uninit(struct vf_instance_s* vf)
  54 {
  55         free(vf->priv);
  56 }
  57
  58 static int open(vf_instance_t *vf, char* args){
  59     vf->config=config;
  60     vf->put_image=put_image;
  61     vf->uninit=uninit;
  62     vf->default_reqs=VFCAP_ACCEPT_STRIDE;
  63     vf->priv=calloc(1, sizeof(struct vf_priv_s));
  64     if (args) sscanf(args, "%d", &vf->priv->field);
  65     vf->priv->field &= 1;
  66     return 1;
  67 }
  68
  69 vf_info_t vf_info_field = {
  70     "extract single field",
  71     "field",
  72     "Rich Felker",
  73     "",
  74     open,
  75     NULL
  76 };
  77
  78 //===========================================================================//