libmpcodecs/vf_field.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
  23 #include "config.h"
  24 #include "mp_msg.h"
  25
  26 #include "mp_image.h"
  27 #include "vf.h"
  28
  29 struct vf_priv_s {
  30     int field;
  31 };
  32
  33 //===========================================================================//
  34
  35 static int config(struct vf_instance* vf,
  36         int width, int height, int d_width, int d_height,
  37         unsigned int flags, unsigned int outfmt){
  38     return vf_next_config(vf,width,height/2,d_width,d_height,flags,outfmt);
  39 }
  40
  41 static int put_image(struct vf_instance* vf, mp_image_t *mpi, double pts){
  42     vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
  43         MP_IMGTYPE_EXPORT, MP_IMGFLAG_ACCEPT_STRIDE,
  44         mpi->width, mpi->height/2);
  45
  46     // set up mpi as a double-stride image of dmpi:
  47     vf->dmpi->planes[0]=mpi->planes[0]+mpi->stride[0]*vf->priv->field;
  48     vf->dmpi->stride[0]=2*mpi->stride[0];
  49     if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
  50         vf->dmpi->planes[1]=mpi->planes[1]+
  51             mpi->stride[1]*vf->priv->field;
  52         vf->dmpi->stride[1]=2*mpi->stride[1];
  53         vf->dmpi->planes[2]=mpi->planes[2]+
  54             mpi->stride[2]*vf->priv->field;
  55         vf->dmpi->stride[2]=2*mpi->stride[2];
  56     } else
  57         vf->dmpi->planes[1]=mpi->planes[1]; // passthru bgr8 palette!!!
  58
  59     return vf_next_put_image(vf,vf->dmpi, pts);
  60 }
  61
  62 //===========================================================================//
  63
  64 static void uninit(struct vf_instance* vf)
  65 {
  66         free(vf->priv);
  67 }
  68
  69 static int open(vf_instance_t *vf, char* args){
  70     vf->config=config;
  71     vf->put_image=put_image;
  72     vf->uninit=uninit;
  73     vf->default_reqs=VFCAP_ACCEPT_STRIDE;
  74     vf->priv=calloc(1, sizeof(struct vf_priv_s));
  75     if (args) sscanf(args, "%d", &vf->priv->field);
  76     vf->priv->field &= 1;
  77     return 1;
  78 }
  79
  80 const vf_info_t vf_info_field = {
  81     "extract single field",
  82     "field",
  83     "Rich Felker",
  84     "",
  85     open,
  86     NULL
  87 };
  88
  89 //===========================================================================//