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ffmpeg / libavfilter / libmpcodecs / vf_down3dright.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 <inttypes.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "cpudetect.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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struct vf_priv_s {
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        int skipline;
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        int scalew;
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        int scaleh;
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};
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static void toright(unsigned char *dst[3], unsigned char *src[3],
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                    int dststride[3], int srcstride[3],
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                    int w, int h, struct vf_priv_s* p)
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{
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        int k;
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        for (k = 0; k < 3; k++) {
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                unsigned char* fromL = src[k];
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                unsigned char* fromR = src[k];
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                unsigned char* to = dst[k];
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                int src = srcstride[k];
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                int dst = dststride[k];
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                int ss;
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                unsigned int dd;
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                int i;
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                if (k > 0) {
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                        i = h / 4 - p->skipline / 2;
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                        ss = src * (h / 4 + p->skipline / 2);
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                        dd = w / 4;
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                } else {
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                        i = h / 2 - p->skipline;
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                        ss = src * (h / 2 + p->skipline);
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                        dd = w / 2;
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                }
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                fromR += ss;
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                for ( ; i > 0; i--) {
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                        int j;
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                        unsigned char* t = to;
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                        unsigned char* sL = fromL;
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                        unsigned char* sR = fromR;
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                        if (p->scalew == 1) {
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                                for (j = dd; j > 0; j--) {
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                                        *t++ = (sL[0] + sL[1]) / 2;
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                                        sL+=2;
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                                }
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                                for (j = dd ; j > 0; j--) {
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                                        *t++ = (sR[0] + sR[1]) / 2;
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                                        sR+=2;
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                                }
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                        } else {
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                                for (j = dd * 2 ; j > 0; j--)
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                                        *t++ = *sL++;
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                                for (j = dd * 2 ; j > 0; j--)
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                                        *t++ = *sR++;
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                        }
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                        if (p->scaleh == 1) {
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                                fast_memcpy(to + dst, to, dst);
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                                to += dst;
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                        }
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                        to += dst;
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                        fromL += src;
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                        fromR += src;
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                }
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                //printf("K %d  %d   %d   %d  %d \n", k, w, h,  src, dst);
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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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{
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        mp_image_t *dmpi;
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        // hope we'll get DR buffer:
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        dmpi=vf_get_image(vf->next, IMGFMT_YV12,
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                          MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE |
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                          (vf->priv->scaleh == 1) ? MP_IMGFLAG_READABLE : 0,
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                          mpi->w * vf->priv->scalew,
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                          mpi->h / vf->priv->scaleh - vf->priv->skipline);
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        toright(dmpi->planes, mpi->planes, dmpi->stride,
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                mpi->stride, mpi->w, mpi->h, vf->priv);
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        return vf_next_put_image(vf,dmpi, pts);
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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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{
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        /* FIXME - also support UYVY output? */
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        return vf_next_config(vf, width * vf->priv->scalew,
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                              height / vf->priv->scaleh - vf->priv->skipline, d_width, d_height, flags, IMGFMT_YV12);
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}
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static int query_format(struct vf_instance *vf, unsigned int fmt)
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{
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        /* FIXME - really any YUV 4:2:0 input format should work */
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        switch (fmt) {
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        case IMGFMT_YV12:
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        case IMGFMT_IYUV:
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        case IMGFMT_I420:
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                return vf_next_query_format(vf, IMGFMT_YV12);
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        }
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        return 0;
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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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{
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        vf->config=config;
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        vf->query_format=query_format;
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        vf->put_image=put_image;
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        vf->uninit=uninit;
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        vf->priv = calloc(1, sizeof (struct vf_priv_s));
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        vf->priv->skipline = 0;
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        vf->priv->scalew = 1;
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        vf->priv->scaleh = 2;
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        if (args) sscanf(args, "%d:%d:%d", &vf->priv->skipline, &vf->priv->scalew, &vf->priv->scaleh);
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        return 1;
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}
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const vf_info_t vf_info_down3dright = {
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        "convert stereo movie from top-bottom to left-right field",
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        "down3dright",
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        "Zdenek Kabelac",
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        "",
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        vf_open,
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        NULL
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};