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stream_dvdnav: ok, this makes no sense at all

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The dvdnav API reads in 2K blocks (dvdnav_get_next_block()). The mpv
wrapper (fill_buffer() in this file) expects that the read size done by
the mpv core is at least 2K for this reason. If not, it returns an
error.

This used to be OK, because there was a thing called section alignment
in the core code. This was removed because the core shouldn't suffer
from optical disc idiosyncrasies. Which means that ever since, it has
been working only by coincidence, or maybe not at all.

Fixing this would require keeping a buffer in the priv struct, and
returning it piece by piece if the core makes smaller reads. I have no
intention of writing such code, so add an error message asking for a
patch. If anyone actually cares about DVD, maybe it'll get fixed.
This commit is contained in:
wm4 2019-11-07 15:37:18 +01:00
parent 6fc0e7e0a0
commit ca75fedaf4
1 changed files with 4 additions and 1 deletions
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5
stream/stream_dvdnav.c
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@ -262,8 +262,11 @@ static int fill_buffer(stream_t *s, void *buf, int max_len)
struct priv *priv = s->priv;
dvdnav_t *dvdnav = priv->dvdnav;
if (max_len < 2048)
if (max_len < 2048) {
MP_FATAL(s, "Short read size. Data corruption will follow. Please "
"provide a patch.\n");
return -1;
}
while (1) {
int len = -1;