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spark: implement cVideo::getBlank()

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this is a hack: the "mailbox" irq count does not increase if the
decoders are not decoding, so we use this to determine if the
video is in really playing.
This commit is contained in:
Stefan Seyfried
2012-07-05 20:24:40 +02:00
parent 47114a90af
commit 2d52b68c2d
1 changed files with 28 additions and 2 deletions
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30
libspark/video.cpp
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@@ -490,8 +490,34 @@ void cVideo::Standby(unsigned int bOn)
int cVideo::getBlank(void)
{
lt_debug("%s\n", __FUNCTION__);
return 0;
static unsigned int lastcount = 0;
unsigned int count = 0;
size_t n = 0;
ssize_t r;
char *line = NULL;
char *p;
/* hack: the "mailbox" irq is not increasing if
* no audio or video is decoded... */
FILE *f = fopen("/proc/interrupts", "r");
if (! f) /* huh? */
return 0;
while ((r = getline(&line, &n, f)) != -1)
{
if (r <= strlen("mailbox")) /* should not happen... */
continue;
line[r - 1] = 0; /* remove \n */
if (!strcmp(&line[r - 1 - strlen("mailbox")], "mailbox"))
{
count = atoi(line + 5);
break;
}
}
free(line);
fclose(f);
int ret = (count == lastcount); /* no new decode -> return 1 */
lt_debug("%s: %d (irq++: %d)\n", __func__, ret, count - lastcount);
lastcount = count;
return ret;
}
/* this function is regularly called, checks if video parameters