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drm_vo: pixel aspect from --monitoraspect 

When pixels are non-square, the appropriate value of vo->monitor_par is
necessary to determine the destination rectangle, which in turn tells
how to scale the video along the x and y axis. Before this commit, the
drm driver only used --monitorpixelaspect. For example, to play a video
with the right aspect on a 4:3 screen and 640:400 pixels,
--monitorpixelaspect=5:6 had to be given.

With this commit, vo->monitor_par is determined from the size of the
screen in pixels and the --monitoraspect parameter. The latter is
usually easier to determine than --monitorpixelaspect, since it is
simply the proportion between the width and the height of the screen,
in most cases 16:9 or 4:3. If --monitoraspect is not given,
--monitorpixelaspect is used if given, otherwise pixel aspect is
assumed 1:1.
This commit is contained in:
Marco Migliori 2018-02-15 13:33:19 +01:00 committed by Kevin Mitchell
parent ed13206a18
commit 5cc796dacc
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GPG Key ID: 559A34B46A917232
1 changed files with 7 additions and 1 deletions
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8
video/out/vo_drm.c
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@ -443,7 +443,13 @@ static int preinit(struct vo *vo)
goto err;
}
vo->monitor_par = 1 / vo->opts->monitor_pixel_aspect;
if (vo->opts->force_monitor_aspect != 0.0) {
vo->monitor_par = p->screen_w / (double) p->screen_h /
vo->opts->force_monitor_aspect;
} else {
vo->monitor_par = 1 / vo->opts->monitor_pixel_aspect;
}
mp_verbose(vo->log, "Monitor pixel aspect: %g\n", vo->monitor_par);
return 0;