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, double pts){
  26     vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
  27         MP_IMGTYPE_EXPORT, MP_IMGFLAG_ACCEPT_STRIDE,
  28         mpi->width, mpi->height/2);
  29
  30     // set up mpi as a double-stride image of dmpi:
  31     vf->dmpi->planes[0]=mpi->planes[0]+mpi->stride[0]*vf->priv->field;
  32     vf->dmpi->stride[0]=2*mpi->stride[0];
  33     if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
  34         vf->dmpi->planes[1]=mpi->planes[1]+
  35             mpi->stride[1]*vf->priv->field;
  36         vf->dmpi->stride[1]=2*mpi->stride[1];
  37         vf->dmpi->planes[2]=mpi->planes[2]+
  38             mpi->stride[2]*vf->priv->field;
  39         vf->dmpi->stride[2]=2*mpi->stride[2];
  40     } else
  41         vf->dmpi->planes[1]=mpi->planes[1]; // passthru bgr8 palette!!!
  42
  43     return vf_next_put_image(vf,vf->dmpi, pts);
  44 }
  45
  46 //===========================================================================//
  47
  48 static void uninit(struct vf_instance_s* vf)
  49 {
  50         free(vf->priv);
  51 }
  52
  53 static int open(vf_instance_t *vf, char* args){
  54     vf->config=config;
  55     vf->put_image=put_image;
  56     vf->uninit=uninit;
  57     vf->default_reqs=VFCAP_ACCEPT_STRIDE;
  58     vf->priv=calloc(1, sizeof(struct vf_priv_s));
  59     if (args) sscanf(args, "%d", &vf->priv->field);
  60     vf->priv->field &= 1;
  61     return 1;
  62 }
  63
  64 vf_info_t vf_info_field = {
  65     "extract single field",
  66     "field",
  67     "Rich Felker",
  68     "",
  69     open,
  70     NULL
  71 };
  72
  73 //===========================================================================//