libmpcodecs/vf_dsize.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
  27 #include "img_format.h"
  28 #include "mp_image.h"
  29 #include "vf.h"
  30
  31 struct vf_priv_s {
  32     int w, h;
  33     int method; // aspect method, 0 -> downscale, 1-> upscale. +2 -> original aspect.
  34     int round;
  35     float aspect;
  36 };
  37
  38 static int config(struct vf_instance *vf,
  39     int width, int height, int d_width, int d_height,
  40     unsigned int flags, unsigned int outfmt)
  41 {
  42     int w = vf->priv->w;
  43     int h = vf->priv->h;
  44     if (vf->priv->aspect < 0.001) { // did the user input aspect or w,h params
  45         if (w == 0) w = d_width;
  46         if (h == 0) h = d_height;
  47         if (w == -1) w = width;
  48         if (h == -1) h = height;
  49         if (w == -2) w = h * (double)d_width / d_height;
  50         if (w == -3) w = h * (double)width / height;
  51         if (h == -2) h = w * (double)d_height / d_width;
  52         if (h == -3) h = w * (double)height / width;
  53         if (vf->priv->method > -1) {
  54             double aspect = (vf->priv->method & 2) ? ((double)height / width) : ((double)d_height / d_width);
  55             if ((h > w * aspect) ^ (vf->priv->method & 1)) {
  56                 h = w * aspect;
  57             } else {
  58                 w = h / aspect;
  59             }
  60         }
  61         if (vf->priv->round > 1) { // round up
  62             w += (vf->priv->round - 1 - (w - 1) % vf->priv->round);
  63             h += (vf->priv->round - 1 - (h - 1) % vf->priv->round);
  64         }
  65         d_width = w;
  66         d_height = h;
  67     } else {
  68         if (vf->priv->aspect * height > width) {
  69             d_width = height * vf->priv->aspect + .5;
  70             d_height = height;
  71         } else {
  72             d_height = width / vf->priv->aspect + .5;
  73             d_width = width;
  74         }
  75     }
  76     return vf_next_config(vf, width, height, d_width, d_height, flags, outfmt);
  77 }
  78
  79 static void uninit(vf_instance_t *vf) {
  80     free(vf->priv);
  81     vf->priv = NULL;
  82 }
  83
  84 static int vf_open(vf_instance_t *vf, char *args)
  85 {
  86     vf->config = config;
  87     vf->draw_slice = vf_next_draw_slice;
  88     vf->uninit = uninit;
  89     //vf->default_caps = 0;
  90     vf->priv = calloc(sizeof(struct vf_priv_s), 1);
  91     vf->priv->aspect = 0.;
  92     vf->priv->w = -1;
  93     vf->priv->h = -1;
  94     vf->priv->method = -1;
  95     vf->priv->round = 1;
  96     if (args) {
  97         if (strchr(args, '/')) {
  98             int w, h;
  99             sscanf(args, "%d/%d", &w, &h);
 100             vf->priv->aspect = (float)w/h;
 101         } else if (strchr(args, '.')) {
 102             sscanf(args, "%f", &vf->priv->aspect);
 103         } else {
 104             sscanf(args, "%d:%d:%d:%d", &vf->priv->w, &vf->priv->h, &vf->priv->method, &vf->priv->round);
 105         }
 106     }
 107     if ((vf->priv->aspect < 0.) || (vf->priv->w < -3) || (vf->priv->h < -3) ||
 108             ((vf->priv->w < -1) && (vf->priv->h < -1)) ||
 109             (vf->priv->method < -1) || (vf->priv->method > 3) ||
 110             (vf->priv->round < 0)) {
 111         mp_msg(MSGT_VFILTER, MSGL_ERR, "[dsize] Illegal value(s): aspect: %f w: %d h: %d aspect_method: %d round: %d\n", vf->priv->aspect, vf->priv->w, vf->priv->h, vf->priv->method, vf->priv->round);
 112         free(vf->priv); vf->priv = NULL;
 113         return -1;
 114     }
 115     return 1;
 116 }
 117
 118 const vf_info_t vf_info_dsize = {
 119     "reset displaysize/aspect",
 120     "dsize",
 121     "Rich Felker",
 122     "",
 123     vf_open,
 124     NULL
 125 };