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ffmpeg / libavfilter / libmpcodecs / vf_field.c @ e4852fb3

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/*
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 * This file is part of MPlayer.
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 *
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 * MPlayer is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * MPlayer is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License along
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 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "mp_image.h"
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#include "vf.h"
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struct vf_priv_s {
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    int field;
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};
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//===========================================================================//
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static int config(struct vf_instance *vf,
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        int width, int height, int d_width, int d_height,
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        unsigned int flags, unsigned int outfmt){
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    return vf_next_config(vf,width,height/2,d_width,d_height,flags,outfmt);
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}
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static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
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    vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
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        MP_IMGTYPE_EXPORT, MP_IMGFLAG_ACCEPT_STRIDE,
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        mpi->width, mpi->height/2);
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    // set up mpi as a double-stride image of dmpi:
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    vf->dmpi->planes[0]=mpi->planes[0]+mpi->stride[0]*vf->priv->field;
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    vf->dmpi->stride[0]=2*mpi->stride[0];
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    if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
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        vf->dmpi->planes[1]=mpi->planes[1]+
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            mpi->stride[1]*vf->priv->field;
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        vf->dmpi->stride[1]=2*mpi->stride[1];
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        vf->dmpi->planes[2]=mpi->planes[2]+
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            mpi->stride[2]*vf->priv->field;
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        vf->dmpi->stride[2]=2*mpi->stride[2];
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    } else
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        vf->dmpi->planes[1]=mpi->planes[1]; // passthru bgr8 palette!!!
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    return vf_next_put_image(vf,vf->dmpi, pts);
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}
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//===========================================================================//
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static void uninit(struct vf_instance *vf)
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{
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        free(vf->priv);
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}
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static int vf_open(vf_instance_t *vf, char *args){
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    vf->config=config;
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    vf->put_image=put_image;
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    vf->uninit=uninit;
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    vf->default_reqs=VFCAP_ACCEPT_STRIDE;
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    vf->priv=calloc(1, sizeof(struct vf_priv_s));
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    if (args) sscanf(args, "%d", &vf->priv->field);
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    vf->priv->field &= 1;
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    return 1;
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}
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const vf_info_t vf_info_field = {
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    "extract single field",
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    "field",
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    "Rich Felker",
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    "",
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    vf_open,
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    NULL
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};
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//===========================================================================//