mirror of
https://github.com/mpv-player/mpv
synced 2024-12-16 20:05:07 +00:00
0a0bb9059f
MPlayer traditionally always used the display aspect ratio, e.g. 16:9, while FFmpeg uses the sample (aka pixel) aspect ratio. Both have a bunch of advantages and disadvantages. Actually, it seems using sample aspect ratio is generally nicer. The main reason for the change is making mpv closer to how FFmpeg works in order to make life easier. It's also nice that everything uses integer fractions instead of floats now (except --video-aspect option/property). Note that there is at least 1 user-visible change: vf_dsize now does not set the display size, only the display aspect ratio. This is because the image_params d_w/d_h fields did not just set the display aspect, but also the size (except in encoding mode).
188 lines
6.6 KiB
C
188 lines
6.6 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv 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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* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Stuff for correct aspect scaling. */
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#include "aspect.h"
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#include "vo.h"
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#include "common/msg.h"
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#include "options/options.h"
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#include "video/mp_image.h"
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#include "vo.h"
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#include "sub/osd.h"
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static void aspect_calc_panscan(struct mp_log *log, struct mp_vo_opts *opts,
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int w, int h, int d_w, int d_h,
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int window_w, int window_h, double monitor_par,
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int *out_w, int *out_h)
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{
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mp_dbg(log, "aspect(0) fitin: %dx%d monitor_par: %.2f\n",
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window_w, window_h, monitor_par);
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int fwidth = window_w;
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int fheight = (float)window_w / d_w * d_h / monitor_par;
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mp_dbg(log, "aspect(1) wh: %dx%d (org: %dx%d)\n",
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fwidth, fheight, d_w, d_h);
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if (fheight > window_h || fheight < h) {
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int tmpw = (float)window_h / d_h * d_w * monitor_par;
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if (tmpw <= window_w) {
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fheight = window_h;
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fwidth = tmpw;
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} else if (fheight > window_h) {
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mp_warn(log, "No suitable new aspect found!\n");
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}
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}
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mp_dbg(log, "aspect(2) wh: %dx%d (org: %dx%d)\n",
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fwidth, fheight, d_w, d_h);
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int vo_panscan_area = window_h - fheight;
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double f_w = fwidth / (double)fheight;
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double f_h = 1;
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if (!vo_panscan_area) {
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vo_panscan_area = window_w - fwidth;
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f_w = 1;
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f_h = fheight / (double)fwidth;
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}
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*out_w = fwidth + vo_panscan_area * opts->panscan * f_w;
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*out_h = fheight + vo_panscan_area * opts->panscan * f_h;
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}
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// Clamp [start, end) to range [0, size) with various fallbacks.
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static void clamp_size(int size, int *start, int *end)
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{
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*start = MPMAX(0, *start);
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*end = MPMIN(size, *end);
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if (*start >= *end) {
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*start = 0;
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*end = 1;
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}
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}
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static void src_dst_split_scaling(int src_size, int dst_size,
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int scaled_src_size, bool unscaled,
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float zoom, float align, float pan,
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int *src_start, int *src_end,
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int *dst_start, int *dst_end,
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int *osd_margin_a, int *osd_margin_b)
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{
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if (unscaled) {
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scaled_src_size = src_size;
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zoom = 0.0;
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}
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scaled_src_size += zoom * scaled_src_size;
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align = (align + 1) / 2;
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*src_start = 0;
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*src_end = src_size;
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*dst_start = (dst_size - scaled_src_size) * align + pan * scaled_src_size;
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*dst_end = *dst_start + scaled_src_size;
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// Distance of screen frame to video
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*osd_margin_a = *dst_start;
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*osd_margin_b = dst_size - *dst_end;
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// Clip to screen
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int s_src = *src_end - *src_start;
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int s_dst = *dst_end - *dst_start;
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if (*dst_start < 0) {
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int border = -(*dst_start) * s_src / s_dst;
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*src_start += border;
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*dst_start = 0;
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}
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if (*dst_end > dst_size) {
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int border = (*dst_end - dst_size) * s_src / s_dst;
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*src_end -= border;
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*dst_end = dst_size;
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}
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if (unscaled) {
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// Force unscaled by reducing the range for src or dst
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int src_s = *src_end - *src_start;
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int dst_s = *dst_end - *dst_start;
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if (src_s > dst_s) {
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*src_end = *src_start + dst_s;
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} else if (src_s < dst_s) {
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*dst_end = *dst_start + src_s;
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}
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}
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// For sanity: avoid bothering VOs with corner cases
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clamp_size(src_size, src_start, src_end);
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clamp_size(dst_size, dst_start, dst_end);
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}
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void mp_get_src_dst_rects(struct mp_log *log, struct mp_vo_opts *opts,
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int vo_caps, struct mp_image_params *video,
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int window_w, int window_h, double monitor_par,
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struct mp_rect *out_src,
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struct mp_rect *out_dst,
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struct mp_osd_res *out_osd)
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{
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int src_w = video->w;
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int src_h = video->h;
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int src_dw, src_dh;
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mp_image_params_get_dsize(video, &src_dw, &src_dh);
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if (video->rotate % 180 == 90 && (vo_caps & VO_CAP_ROTATE90)) {
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MPSWAP(int, src_w, src_h);
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MPSWAP(int, src_dw, src_dh);
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}
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window_w = MPMAX(1, window_w);
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window_h = MPMAX(1, window_h);
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struct mp_rect dst = {0, 0, window_w, window_h};
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struct mp_rect src = {0, 0, src_w, src_h};
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struct mp_osd_res osd = {
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.w = window_w,
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.h = window_h,
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.display_par = monitor_par,
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};
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if (opts->keepaspect) {
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int scaled_width, scaled_height;
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aspect_calc_panscan(log, opts, src_w, src_h, src_dw, src_dh,
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window_w, window_h, monitor_par,
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&scaled_width, &scaled_height);
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src_dst_split_scaling(src_w, window_w, scaled_width, opts->unscaled,
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opts->zoom, opts->align_x, opts->pan_x,
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&src.x0, &src.x1, &dst.x0, &dst.x1,
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&osd.ml, &osd.mr);
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src_dst_split_scaling(src_h, window_h, scaled_height, opts->unscaled,
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opts->zoom, opts->align_y, opts->pan_y,
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&src.y0, &src.y1, &dst.y0, &dst.y1,
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&osd.mt, &osd.mb);
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}
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*out_src = src;
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*out_dst = dst;
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*out_osd = osd;
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int sw = src.x1 - src.x0, sh = src.y1 - src.y0;
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int dw = dst.x1 - dst.x0, dh = dst.y1 - dst.y0;
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mp_verbose(log, "Window size: %dx%d\n",
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window_w, window_h);
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mp_verbose(log, "Video source: %dx%d (%d:%d)\n",
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video->w, video->h, video->p_w, video->p_h);
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mp_verbose(log, "Video display: (%d, %d) %dx%d -> (%d, %d) %dx%d\n",
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src.x0, src.y0, sw, sh, dst.x0, dst.y0, dw, dh);
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mp_verbose(log, "Video scale: %f/%f\n",
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(double)dw / sw, (double)dh / sh);
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mp_verbose(log, "OSD borders: l=%d t=%d r=%d b=%d\n",
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osd.ml, osd.mt, osd.mr, osd.mb);
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mp_verbose(log, "Video borders: l=%d t=%d r=%d b=%d\n",
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dst.x0, dst.y0, window_w - dst.x1, window_h - dst.y1);
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}
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