libmpcodecs/vf_crop.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 #include "options.h"
  26
  27 #include "img_format.h"
  28 #include "mp_image.h"
  29 #include "vf.h"
  30
  31 #include "m_option.h"
  32 #include "m_struct.h"
  33
  34 static const struct vf_priv_s {
  35     int crop_w,crop_h;
  36     int crop_x,crop_y;
  37 } vf_priv_dflt = {
  38   -1,-1,
  39   -1,-1
  40 };
  41
  42 //===========================================================================//
  43
  44 static int config(struct vf_instance *vf,
  45         int width, int height, int d_width, int d_height,
  46         unsigned int flags, unsigned int outfmt){
  47     struct MPOpts *opts = vf->opts;
  48     // calculate the missing parameters:
  49     if(vf->priv->crop_w<=0 || vf->priv->crop_w>width) vf->priv->crop_w=width;
  50     if(vf->priv->crop_h<=0 || vf->priv->crop_h>height) vf->priv->crop_h=height;
  51     if(vf->priv->crop_x<0) vf->priv->crop_x=(width-vf->priv->crop_w)/2;
  52     if(vf->priv->crop_y<0) vf->priv->crop_y=(height-vf->priv->crop_h)/2;
  53     // rounding:
  54     if(!IMGFMT_IS_RGB(outfmt) && !IMGFMT_IS_BGR(outfmt)){
  55         switch(outfmt){
  56         case IMGFMT_444P:
  57         case IMGFMT_Y800:
  58         case IMGFMT_Y8:
  59             break;
  60         case IMGFMT_YVU9:
  61         case IMGFMT_IF09:
  62             vf->priv->crop_y&=~3;
  63         case IMGFMT_411P:
  64             vf->priv->crop_x&=~3;
  65             break;
  66         case IMGFMT_YV12:
  67         case IMGFMT_I420:
  68         case IMGFMT_IYUV:
  69             vf->priv->crop_y&=~1;
  70         default:
  71             vf->priv->crop_x&=~1;
  72         }
  73     }
  74     // check:
  75     if(vf->priv->crop_w+vf->priv->crop_x>width ||
  76        vf->priv->crop_h+vf->priv->crop_y>height){
  77         mp_tmsg(MSGT_VFILTER, MSGL_WARN, "[CROP] Bad position/width/height - cropped area outside of the original!\n");
  78         return 0;
  79     }
  80     if(!opts->screen_size_x && !opts->screen_size_y){
  81         d_width=d_width*vf->priv->crop_w/width;
  82         d_height=d_height*vf->priv->crop_h/height;
  83     }
  84     return vf_next_config(vf,vf->priv->crop_w,vf->priv->crop_h,d_width,d_height,flags,outfmt);
  85 }
  86
  87 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
  88     mp_image_t *dmpi;
  89     if (mpi->flags&MP_IMGFLAG_DRAW_CALLBACK)
  90         return vf_next_put_image(vf,vf->dmpi, pts);
  91     dmpi=vf_get_image(vf->next,mpi->imgfmt,
  92         MP_IMGTYPE_EXPORT, 0,
  93         vf->priv->crop_w, vf->priv->crop_h);
  94     if(mpi->flags&MP_IMGFLAG_PLANAR){
  95         dmpi->planes[0]=mpi->planes[0]+
  96             vf->priv->crop_y*mpi->stride[0]+vf->priv->crop_x;
  97         dmpi->planes[1]=mpi->planes[1]+
  98             (vf->priv->crop_y>>mpi->chroma_y_shift)*mpi->stride[1]+(vf->priv->crop_x>>mpi->chroma_x_shift);
  99         dmpi->planes[2]=mpi->planes[2]+
 100             (vf->priv->crop_y>>mpi->chroma_y_shift)*mpi->stride[2]+(vf->priv->crop_x>>mpi->chroma_x_shift);
 101         dmpi->stride[1]=mpi->stride[1];
 102         dmpi->stride[2]=mpi->stride[2];
 103     } else {
 104         dmpi->planes[0]=mpi->planes[0]+
 105             vf->priv->crop_y*mpi->stride[0]+
 106             vf->priv->crop_x*(mpi->bpp/8);
 107         dmpi->planes[1]=mpi->planes[1]; // passthrough rgb8 palette
 108     }
 109     dmpi->stride[0]=mpi->stride[0];
 110     dmpi->width=mpi->width;
 111     return vf_next_put_image(vf,dmpi, pts);
 112 }
 113
 114 static void start_slice(struct vf_instance *vf, mp_image_t *mpi){
 115     vf->dmpi = vf_get_image(vf->next, mpi->imgfmt, mpi->type, mpi->flags,
 116         vf->priv->crop_w, vf->priv->crop_h);
 117 }
 118
 119 static void draw_slice(struct vf_instance *vf,
 120         unsigned char** src, int* stride, int w,int h, int x, int y){
 121     unsigned char *src2[3];
 122     src2[0] = src[0];
 123     if (vf->dmpi->flags & MP_IMGFLAG_PLANAR) {
 124             src2[1] = src[1];
 125             src2[2] = src[2];
 126     }
 127     //mp_msg(MSGT_VFILTER, MSGL_V, "crop slice %d %d %d %d ->", w,h,x,y);
 128     if ((x -= vf->priv->crop_x) < 0) {
 129         x = -x;
 130         src2[0] += x;
 131         if (vf->dmpi->flags & MP_IMGFLAG_PLANAR) {
 132                 src2[1] += x>>vf->dmpi->chroma_x_shift;
 133                 src2[2] += x>>vf->dmpi->chroma_x_shift;
 134         }
 135         w -= x;
 136         x = 0;
 137     }
 138     if ((y -= vf->priv->crop_y) < 0) {
 139         y = -y;
 140         src2[0] += y*stride[0];
 141         if (vf->dmpi->flags & MP_IMGFLAG_PLANAR) {
 142                 src2[1] += (y>>vf->dmpi->chroma_y_shift)*stride[1];
 143                 src2[2] += (y>>vf->dmpi->chroma_y_shift)*stride[2];
 144         }
 145         h -= y;
 146         y = 0;
 147     }
 148     if (x+w > vf->priv->crop_w) w = vf->priv->crop_w-x;
 149     if (y+h > vf->priv->crop_h) h = vf->priv->crop_h-y;
 150     //mp_msg(MSGT_VFILTER, MSGL_V, "%d %d %d %d\n", w,h,x,y);
 151     if (w <= 0 || h <= 0) return;
 152     vf_next_draw_slice(vf,src2,stride,w,h,x,y);
 153 }
 154
 155 //===========================================================================//
 156
 157 static int vf_open(vf_instance_t *vf, char *args){
 158     vf->config=config;
 159     vf->put_image=put_image;
 160     vf->start_slice=start_slice;
 161     vf->draw_slice=draw_slice;
 162     vf->default_reqs=VFCAP_ACCEPT_STRIDE;
 163     mp_msg(MSGT_VFILTER, MSGL_INFO, "Crop: %d x %d, %d ; %d\n",
 164     vf->priv->crop_w,
 165     vf->priv->crop_h,
 166     vf->priv->crop_x,
 167     vf->priv->crop_y);
 168     return 1;
 169 }
 170
 171 #define ST_OFF(f) M_ST_OFF(struct vf_priv_s,f)
 172 static const m_option_t vf_opts_fields[] = {
 173   {"w", ST_OFF(crop_w), CONF_TYPE_INT, M_OPT_MIN,0 ,0, NULL},
 174   {"h", ST_OFF(crop_h), CONF_TYPE_INT, M_OPT_MIN,0 ,0, NULL},
 175   {"x", ST_OFF(crop_x), CONF_TYPE_INT, M_OPT_MIN,-1 ,0, NULL},
 176   {"y", ST_OFF(crop_y), CONF_TYPE_INT, M_OPT_MIN,-1 ,0, NULL},
 177   { NULL, NULL, 0, 0, 0, 0,  NULL }
 178 };
 179
 180 static const m_struct_t vf_opts = {
 181   "crop",
 182   sizeof(struct vf_priv_s),
 183   &vf_priv_dflt,
 184   vf_opts_fields
 185 };
 186
 187 const vf_info_t vf_info_crop = {
 188     "cropping",
 189     "crop",
 190     "A'rpi",
 191     "",
 192     vf_open,
 193     &vf_opts
 194 };
 195
 196 //===========================================================================//