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ffmpeg / libavfilter / libmpcodecs / vf_il.c @ e4852fb3

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/*
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 * Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>
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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 <inttypes.h>
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#include <assert.h>
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#include "mp_msg.h"
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#include "img_format.h"
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#include "mp_image.h"
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#include "vf.h"
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#include "libvo/fastmemcpy.h"
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//===========================================================================//
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typedef struct FilterParam{
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    int interleave;
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    int swap;
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}FilterParam;
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struct vf_priv_s {
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    FilterParam lumaParam;
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    FilterParam chromaParam;
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};
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/***************************************************************************/
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static void interleave(uint8_t *dst, uint8_t *src, int w, int h, int dstStride, int srcStride, int interleave, int swap){
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    const int a= swap;
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    const int b= 1-a;
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    const int m= h>>1;
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    int y;
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    switch(interleave){
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    case -1:
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        for(y=0; y < m; y++){
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            fast_memcpy(dst + dstStride* y     , src + srcStride*(y*2 + a), w);
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            fast_memcpy(dst + dstStride*(y + m), src + srcStride*(y*2 + b), w);
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        }
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        break;
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    case 0:
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        for(y=0; y < m; y++){
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            fast_memcpy(dst + dstStride* y*2   , src + srcStride*(y*2 + a), w);
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            fast_memcpy(dst + dstStride*(y*2+1), src + srcStride*(y*2 + b), w);
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        }
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        break;
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    case 1:
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        for(y=0; y < m; y++){
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            fast_memcpy(dst + dstStride*(y*2+a), src + srcStride* y     , w);
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            fast_memcpy(dst + dstStride*(y*2+b), src + srcStride*(y + m), w);
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        }
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        break;
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    }
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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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    int w;
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    FilterParam *luma  = &vf->priv->lumaParam;
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    FilterParam *chroma= &vf->priv->chromaParam;
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    mp_image_t *dmpi=vf_get_image(vf->next,mpi->imgfmt,
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        MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
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        mpi->w,mpi->h);
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    if(mpi->flags&MP_IMGFLAG_PLANAR)
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        w= mpi->w;
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    else
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        w= mpi->w * mpi->bpp/8;
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    interleave(dmpi->planes[0], mpi->planes[0],
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        w, mpi->h, dmpi->stride[0], mpi->stride[0], luma->interleave, luma->swap);
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    if(mpi->flags&MP_IMGFLAG_PLANAR){
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        int cw= mpi->w >> mpi->chroma_x_shift;
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        int ch= mpi->h >> mpi->chroma_y_shift;
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        interleave(dmpi->planes[1], mpi->planes[1], cw,ch,
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            dmpi->stride[1], mpi->stride[1], chroma->interleave, luma->swap);
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        interleave(dmpi->planes[2], mpi->planes[2], cw,ch,
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            dmpi->stride[2], mpi->stride[2], chroma->interleave, luma->swap);
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    }
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    return vf_next_put_image(vf,dmpi, pts);
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}
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//===========================================================================//
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static void parse(FilterParam *fp, char* args){
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    char *pos;
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    char *max= strchr(args, ':');
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    if(!max) max= args + strlen(args);
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    pos= strchr(args, 's');
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    if(pos && pos<max) fp->swap=1;
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    pos= strchr(args, 'i');
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    if(pos && pos<max) fp->interleave=1;
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    pos= strchr(args, 'd');
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    if(pos && pos<max) fp->interleave=-1;
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}
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static int vf_open(vf_instance_t *vf, char *args){
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    vf->put_image=put_image;
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//    vf->get_image=get_image;
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    vf->priv=malloc(sizeof(struct vf_priv_s));
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    memset(vf->priv, 0, sizeof(struct vf_priv_s));
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    if(args)
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    {
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        char *arg2= strchr(args,':');
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        if(arg2) parse(&vf->priv->chromaParam, arg2+1);
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        parse(&vf->priv->lumaParam, args);
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    }
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    return 1;
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}
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const vf_info_t vf_info_il = {
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    "(de)interleave",
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    "il",
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    "Michael Niedermayer",
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    "",
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    vf_open,
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    NULL
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};
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//===========================================================================//