git.sesse.net Git - ffmpeg/blob - libavfilter/libmpcodecs/vf_down3dright.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 #include <inttypes.h>
  23
  24 #include "config.h"
  25 #include "mp_msg.h"
  26 #include "cpudetect.h"
  27
  28 #include "img_format.h"
  29 #include "mp_image.h"
  30 #include "vf.h"
  31
  32 #include "libvo/fastmemcpy.h"
  33
  34 struct vf_priv_s {
  35         int skipline;
  36         int scalew;
  37         int scaleh;
  38 };
  39
  40 static void toright(unsigned char *dst[3], unsigned char *src[3],
  41                     int dststride[3], int srcstride[3],
  42                     int w, int h, struct vf_priv_s* p)
  43 {
  44         int k;
  45
  46         for (k = 0; k < 3; k++) {
  47                 unsigned char* fromL = src[k];
  48                 unsigned char* fromR = src[k];
  49                 unsigned char* to = dst[k];
  50                 int src = srcstride[k];
  51                 int dst = dststride[k];
  52                 int ss;
  53                 unsigned int dd;
  54                 int i;
  55
  56                 if (k > 0) {
  57                         i = h / 4 - p->skipline / 2;
  58                         ss = src * (h / 4 + p->skipline / 2);
  59                         dd = w / 4;
  60                 } else {
  61                         i = h / 2 - p->skipline;
  62                         ss = src * (h / 2 + p->skipline);
  63                         dd = w / 2;
  64                 }
  65                 fromR += ss;
  66                 for ( ; i > 0; i--) {
  67                         int j;
  68                         unsigned char* t = to;
  69                         unsigned char* sL = fromL;
  70                         unsigned char* sR = fromR;
  71
  72                         if (p->scalew == 1) {
  73                                 for (j = dd; j > 0; j--) {
  74                                         *t++ = (sL[0] + sL[1]) / 2;
  75                                         sL+=2;
  76                                 }
  77                                 for (j = dd ; j > 0; j--) {
  78                                         *t++ = (sR[0] + sR[1]) / 2;
  79                                         sR+=2;
  80                                 }
  81                         } else {
  82                                 for (j = dd * 2 ; j > 0; j--)
  83                                         *t++ = *sL++;
  84                                 for (j = dd * 2 ; j > 0; j--)
  85                                         *t++ = *sR++;
  86                         }
  87                         if (p->scaleh == 1) {
  88                                 fast_memcpy(to + dst, to, dst);
  89                                 to += dst;
  90                         }
  91                         to += dst;
  92                         fromL += src;
  93                         fromR += src;
  94                 }
  95                 //printf("K %d  %d   %d   %d  %d \n", k, w, h,  src, dst);
  96         }
  97 }
  98
  99 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
 100 {
 101         mp_image_t *dmpi;
 102
 103         // hope we'll get DR buffer:
 104         dmpi=vf_get_image(vf->next, IMGFMT_YV12,
 105                           MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE |
 106                           (vf->priv->scaleh == 1) ? MP_IMGFLAG_READABLE : 0,
 107                           mpi->w * vf->priv->scalew,
 108                           mpi->h / vf->priv->scaleh - vf->priv->skipline);
 109
 110         toright(dmpi->planes, mpi->planes, dmpi->stride,
 111                 mpi->stride, mpi->w, mpi->h, vf->priv);
 112
 113         return vf_next_put_image(vf,dmpi, pts);
 114 }
 115
 116 static int config(struct vf_instance *vf,
 117                   int width, int height, int d_width, int d_height,
 118                   unsigned int flags, unsigned int outfmt)
 119 {
 120         /* FIXME - also support UYVY output? */
 121         return vf_next_config(vf, width * vf->priv->scalew,
 122                               height / vf->priv->scaleh - vf->priv->skipline, d_width, d_height, flags, IMGFMT_YV12);
 123 }
 124
 125
 126 static int query_format(struct vf_instance *vf, unsigned int fmt)
 127 {
 128         /* FIXME - really any YUV 4:2:0 input format should work */
 129         switch (fmt) {
 130         case IMGFMT_YV12:
 131         case IMGFMT_IYUV:
 132         case IMGFMT_I420:
 133                 return vf_next_query_format(vf, IMGFMT_YV12);
 134         }
 135         return 0;
 136 }
 137
 138 static void uninit(struct vf_instance *vf)
 139 {
 140         free(vf->priv);
 141 }
 142
 143 static int vf_open(vf_instance_t *vf, char *args)
 144 {
 145         vf->config=config;
 146         vf->query_format=query_format;
 147         vf->put_image=put_image;
 148         vf->uninit=uninit;
 149
 150         vf->priv = calloc(1, sizeof (struct vf_priv_s));
 151         vf->priv->skipline = 0;
 152         vf->priv->scalew = 1;
 153         vf->priv->scaleh = 2;
 154         if (args) sscanf(args, "%d:%d:%d", &vf->priv->skipline, &vf->priv->scalew, &vf->priv->scaleh);
 155
 156         return 1;
 157 }
 158
 159 const vf_info_t vf_info_down3dright = {
 160         "convert stereo movie from top-bottom to left-right field",
 161         "down3dright",
 162         "Zdenek Kabelac",
 163         "",
 164         vf_open,
 165         NULL
 166 };