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