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Avoid jumping around in polling mode

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While still avoiding busy loops.

It works well enough to enable this by default.

Closes #1
This commit is contained in:
Přemysl Eric Janouch 2020-10-23 01:56:39 +02:00
parent 9928eca274
commit b6ce8a0913
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 18 additions and 7 deletions
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25
nncmpp.c
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@ -612,7 +612,7 @@ static struct app_context
struct str_map playback_info; ///< Current song info
struct poller_timer elapsed_event; ///< Seconds elapsed event
int64_t elapsed_since; ///< Time of the last tick
int64_t elapsed_since; ///< Last tick ts or last elapsed time
bool elapsed_poll; ///< Poll MPD for the elapsed time?
// TODO: initialize these to -1
@ -719,7 +719,7 @@ static struct config_schema g_config_settings[] =
.comment = "Whether to actively poll MPD for the elapsed time",
.type = CONFIG_ITEM_BOOLEAN,
.on_change = on_poll_elapsed_time_changed,
.default_ = "off" },
.default_ = "on" },
{}
};
@ -3424,20 +3424,31 @@ mpd_update_playback_state (void)
strv_free (&fields);
poller_timer_reset (&g.elapsed_event);
if (g.state == PLAYER_PLAYING)
if (g.state != PLAYER_PLAYING)
g.elapsed_since = -1;
else
{
int until_next = 1000 - msec_past_second;
// We could make use of "until_next", however this might create
// an intensive busy loop when playback stalls (typically because of
// some network issues). Half a second will work reasonably well.
int elapsed_msec = g.song_elapsed * 1000 + msec_past_second;
if (g.elapsed_poll)
until_next = 500;
{
// We may receive an earlier time, this seems to compensate it well;
// in any case MPD polling can't achieve any significant stability
until_next += 100;
// When playback stalls, avoid busy looping with the server
if (elapsed_msec == g.elapsed_since)
until_next = MAX (until_next, 500);
}
// Set a timer for when the next round second of playback happens
poller_timer_set (&g.elapsed_event, until_next);
// Remember when the last round second was, relative to monotonic time
g.elapsed_since = clock_msec (CLOCK_BEST) - msec_past_second;
// In polling mode, we're interested in progress rather than stability
if (g.elapsed_poll)
g.elapsed_since = elapsed_msec;
}
// The server sends -1 when nothing is being played right now