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 struct vf_priv_s {
  12     int field;
  13 };
  14
  15 //===========================================================================//
  16
  17 static int config(struct vf_instance_s* vf,
  18         int width, int height, int d_width, int d_height,
  19         unsigned int flags, unsigned int outfmt){
  20     return vf_next_config(vf,width,height/2,d_width,d_height,flags,outfmt);
  21 }
  22
  23 static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
  24     vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
  25         MP_IMGTYPE_EXPORT, MP_IMGFLAG_ACCEPT_STRIDE,
  26         mpi->width, mpi->height/2);
  27
  28     // set up mpi as a double-stride image of dmpi:
  29     vf->dmpi->planes[0]=mpi->planes[0]+mpi->stride[0]*vf->priv->field;
  30     vf->dmpi->stride[0]=2*mpi->stride[0];
  31     if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
  32         vf->dmpi->planes[1]=mpi->planes[1]+
  33             mpi->stride[1]*vf->priv->field;
  34         vf->dmpi->stride[1]=2*mpi->stride[1];
  35         vf->dmpi->planes[2]=mpi->planes[2]+
  36             mpi->stride[2]*vf->priv->field;
  37         vf->dmpi->stride[2]=2*mpi->stride[2];
  38     } else
  39         vf->dmpi->planes[1]=mpi->planes[1]; // passthru bgr8 palette!!!
  40
  41     return vf_next_put_image(vf,vf->dmpi, pts);
  42 }
  43
  44 //===========================================================================//
  45
  46 static void uninit(struct vf_instance_s* vf)
  47 {
  48         free(vf->priv);
  49 }
  50
  51 static int open(vf_instance_t *vf, char* args){
  52     vf->config=config;
  53     vf->put_image=put_image;
  54     vf->uninit=uninit;
  55     vf->default_reqs=VFCAP_ACCEPT_STRIDE;
  56     vf->priv=calloc(1, sizeof(struct vf_priv_s));
  57     if (args) sscanf(args, "%d", &vf->priv->field);
  58     vf->priv->field &= 1;
  59     return 1;
  60 }
  61
  62 const vf_info_t vf_info_field = {
  63     "extract single field",
  64     "field",
  65     "Rich Felker",
  66     "",
  67     open,
  68     NULL
  69 };
  70
  71 //===========================================================================//