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inputselector: Avoid deadlock when shutting down

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Transition from PLAYING to PAUSED unschedules any pending clock wait,
but there was no guard that prevented another input buffer then waiting
again while in PAUSED before dataflow stops. Use a new `playing` flag to
avoid this, and exit the chain function if instead of playing we're now
flushing. Basically the same as the clocksync element.

Closes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1772

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4098>
This commit is contained in:
Vivia Nikolaidou 2023-03-02 15:51:08 +02:00
parent eab15c8659
commit cf5b659bc6
2 changed files with 19 additions and 0 deletions
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18
subprojects/gstreamer/plugins/elements/gstinputselector.c
View file

@ -853,6 +853,13 @@ gst_input_selector_wait_running_time (GstInputSelector * sel,
continue;
}
if (!sel->playing) {
GST_DEBUG_OBJECT (selpad, "Waiting for playing");
GST_INPUT_SELECTOR_WAIT (sel);
GST_DEBUG_OBJECT (selpad, "Done waiting");
continue;
}
/* FIXME: If no upstream latency was queried yet, do one now */
clock_id =
gst_clock_new_single_shot_id (clock,
@ -1432,6 +1439,7 @@ gst_input_selector_init (GstInputSelector * sel)
g_mutex_init (&sel->lock);
g_cond_init (&sel->cond);
sel->eos = FALSE;
sel->playing = FALSE;
sel->upstream_latency = 0;
sel->last_output_ts = GST_CLOCK_TIME_NONE;
@ -2028,6 +2036,12 @@ gst_input_selector_change_state (GstElement * element,
GST_INPUT_SELECTOR_BROADCAST (self);
GST_INPUT_SELECTOR_UNLOCK (self);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
GST_INPUT_SELECTOR_LOCK (self);
self->playing = TRUE;
GST_INPUT_SELECTOR_BROADCAST (self);
GST_INPUT_SELECTOR_UNLOCK (self);
}
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:{
GList *walk;
@ -2051,6 +2065,10 @@ gst_input_selector_change_state (GstElement * element,
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_input_selector_reset (self);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_INPUT_SELECTOR_LOCK (self);
self->playing = FALSE;
GST_INPUT_SELECTOR_UNLOCK (self);
default:
break;
}

1
subprojects/gstreamer/plugins/elements/gstinputselector.h
View file

@ -81,6 +81,7 @@ struct _GstInputSelector {
gboolean eos;
gboolean eos_sent;
gboolean flushing;
gboolean playing;
GstClockTime upstream_latency;
GstClockTime last_output_ts;