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ffmpeg / libavfilter / libmpcodecs / vf_dsize.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 "img_format.h"
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#include "mp_image.h"
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#include "vf.h"
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struct vf_priv_s {
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    int w, h;
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    int method; // aspect method, 0 -> downscale, 1-> upscale. +2 -> original aspect.
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    int round;
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    float aspect;
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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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    if (vf->priv->aspect < 0.001) { // did the user input aspect or w,h params
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        if (vf->priv->w == 0) vf->priv->w = d_width;
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        if (vf->priv->h == 0) vf->priv->h = d_height;
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        if (vf->priv->w == -1) vf->priv->w = width;
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        if (vf->priv->h == -1) vf->priv->h = height;
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        if (vf->priv->w == -2) vf->priv->w = vf->priv->h * (double)d_width / d_height;
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        if (vf->priv->w == -3) vf->priv->w = vf->priv->h * (double)width / height;
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        if (vf->priv->h == -2) vf->priv->h = vf->priv->w * (double)d_height / d_width;
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        if (vf->priv->h == -3) vf->priv->h = vf->priv->w * (double)height / width;
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        if (vf->priv->method > -1) {
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            double aspect = (vf->priv->method & 2) ? ((double)height / width) : ((double)d_height / d_width);
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            if ((vf->priv->h > vf->priv->w * aspect) ^ (vf->priv->method & 1)) {
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                vf->priv->h = vf->priv->w * aspect;
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            } else {
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                vf->priv->w = vf->priv->h / aspect;
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            }
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        }
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        if (vf->priv->round > 1) { // round up
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            vf->priv->w += (vf->priv->round - 1 - (vf->priv->w - 1) % vf->priv->round);
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            vf->priv->h += (vf->priv->round - 1 - (vf->priv->h - 1) % vf->priv->round);
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        }
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        d_width = vf->priv->w;
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        d_height = vf->priv->h;
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    } else {
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        if (vf->priv->aspect * height > width) {
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            d_width = height * vf->priv->aspect + .5;
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            d_height = height;
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        } else {
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            d_height = width / vf->priv->aspect + .5;
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            d_width = width;
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        }
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    }
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    return vf_next_config(vf, width, height, d_width, d_height, flags, outfmt);
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}
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static void uninit(vf_instance_t *vf) {
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    free(vf->priv);
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    vf->priv = NULL;
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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->draw_slice = vf_next_draw_slice;
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    vf->uninit = uninit;
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    //vf->default_caps = 0;
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    vf->priv = calloc(sizeof(struct vf_priv_s), 1);
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    vf->priv->aspect = 0.;
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    vf->priv->w = -1;
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    vf->priv->h = -1;
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    vf->priv->method = -1;
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    vf->priv->round = 1;
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    if (args) {
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        if (strchr(args, '/')) {
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            int w, h;
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            sscanf(args, "%d/%d", &w, &h);
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            vf->priv->aspect = (float)w/h;
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        } else if (strchr(args, '.')) {
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            sscanf(args, "%f", &vf->priv->aspect);
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        } else {
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            sscanf(args, "%d:%d:%d:%d", &vf->priv->w, &vf->priv->h, &vf->priv->method, &vf->priv->round);
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        }
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    }
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    if ((vf->priv->aspect < 0.) || (vf->priv->w < -3) || (vf->priv->h < -3) ||
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            ((vf->priv->w < -1) && (vf->priv->h < -1)) ||
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            (vf->priv->method < -1) || (vf->priv->method > 3) ||
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            (vf->priv->round < 0)) {
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        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);
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        free(vf->priv); vf->priv = NULL;
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        return -1;
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    }
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    return 1;
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}
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const vf_info_t vf_info_dsize = {
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    "reset displaysize/aspect",
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    "dsize",
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    "Rich Felker",
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    "",
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    vf_open,
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    NULL
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};