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Commit 1b417192 authored by Yves Lefebvre's avatar Yves Lefebvre Committed by Wim Taymans

gst/gstelement.h: Clarify _NO_PREROLL a bit more.

Original commit message from CVS:
* gst/gstelement.h:
Clarify _NO_PREROLL a bit more.
* gst/gstevent.c:
Fix docs.
* gst/gstpad.c: (gst_pad_link_check_hierarchy),
(gst_pad_get_caps_unlocked), (gst_pad_save_thyself),
(handle_pad_block), (gst_pad_push_event), (gst_pad_send_event):
Patch by: Yves Lefebvre <ivanohe at abacom dot com> Fix possible deadlock
due to wrong locking order. Fixes #361769.
Remove some redundant/misplaced checks in pad_block.
* libs/gst/base/gstbasesink.c: (gst_base_sink_get_position):
For negative rates, count backwards from the duration.
parent f038abdb
2006-10-13 Wim Taymans <wim@fluendo.com>
* gst/gstelement.h:
Clarify _NO_PREROLL a bit more.
* gst/gstevent.c:
Fix docs.
* gst/gstpad.c: (gst_pad_link_check_hierarchy),
(gst_pad_get_caps_unlocked), (gst_pad_save_thyself),
(handle_pad_block), (gst_pad_push_event), (gst_pad_send_event):
Patch by: Yves Lefebvre <ivanohe at abacom dot com> Fix possible deadlock
due to wrong locking order. Fixes #361769.
Remove some redundant/misplaced checks in pad_block.
* libs/gst/base/gstbasesink.c: (gst_base_sink_get_position):
For negative rates, count backwards from the duration.
2006-10-13 Tim-Philipp Müller <tim at centricular dot net>
* gst/gsterror.c: (_gst_library_errors_init):
......
......@@ -77,9 +77,12 @@ G_BEGIN_DECLS
* @GST_STATE_CHANGE_FAILURE : the state change failed
* @GST_STATE_CHANGE_SUCCESS : the state change succeeded
* @GST_STATE_CHANGE_ASYNC : the state change will happen asynchronously
* @GST_STATE_CHANGE_NO_PREROLL: the state change cannot be prerolled
* @GST_STATE_CHANGE_NO_PREROLL: the state change succeeded but the element cannot
* produce data in PAUSED. This typically happens
* with live sources.
*
* the possible return values from a state change function.
* The possible return values from a state change function. Only
* @GST_STATE_CHANGE_FAILURE is a real failure.
*/
typedef enum {
GST_STATE_CHANGE_FAILURE = 0,
......
......@@ -492,7 +492,7 @@ gst_event_parse_new_segment (GstEvent * event, gboolean * update,
*
* @start cannot be -1, @stop can be -1. If there
* is a valid @stop given, it must be greater or equal the @start, including
* when the indicated playback @rate is < 0
* when the indicated playback @rate is < 0.
*
* The @applied_rate value provides information about any rate adjustment that
* has already been made to the timestamps and content on the buffers of the
......
......@@ -1665,43 +1665,50 @@ static gboolean
gst_pad_link_check_hierarchy (GstPad * src, GstPad * sink)
{
GstObject *psrc, *psink;
gboolean res = TRUE;
psrc = GST_OBJECT_PARENT (src);
psink = GST_OBJECT_PARENT (sink);
/* if one of the pads has no parent, we allow the link */
if (psrc && psink) {
/* if the parents are the same, we have a loop */
if (G_UNLIKELY (psrc == psink))
goto same_parents;
/* if they both have a parent, we check the grandparents */
psrc = gst_object_get_parent (psrc);
psink = gst_object_get_parent (psink);
if (G_UNLIKELY (psrc != psink)) {
/* if they have grandparents but they are not the same */
GST_CAT_DEBUG (GST_CAT_CAPS,
"pads have different grandparents %" GST_PTR_FORMAT " and %"
GST_PTR_FORMAT, psrc, psink);
res = FALSE;
}
if (psrc)
gst_object_unref (psrc);
if (psink)
gst_object_unref (psink);
}
done:
return res;
if (G_UNLIKELY (psrc == NULL || psink == NULL))
goto no_parent;
/* if the parents are the same, we have a loop */
if (G_UNLIKELY (psrc == psink))
goto same_parents;
/* if they both have a parent, we check the grandparents. We can not lock
* the parent because we hold on the child (pad) and the locking order is
* parent >> child. */
psrc = GST_OBJECT_PARENT (psrc);
psink = GST_OBJECT_PARENT (psink);
/* if they have grandparents but they are not the same */
if (G_UNLIKELY (psrc != psink))
goto wrong_grandparents;
return TRUE;
/* ERRORS */
no_parent:
{
GST_CAT_DEBUG (GST_CAT_CAPS,
"one of the pads has no parent %" GST_PTR_FORMAT " and %"
GST_PTR_FORMAT, psrc, psink);
return TRUE;
}
same_parents:
{
GST_CAT_DEBUG (GST_CAT_CAPS, "pads have same parent %" GST_PTR_FORMAT,
psrc);
res = FALSE;
goto done;
return FALSE;
}
wrong_grandparents:
{
GST_CAT_DEBUG (GST_CAT_CAPS,
"pads have different grandparents %" GST_PTR_FORMAT " and %"
GST_PTR_FORMAT, psrc, psink);
return FALSE;
}
}
......@@ -3203,8 +3210,8 @@ gst_ghost_pad_save_thyself (GstPad * pad, xmlNodePtr parent)
* the pad block happens.
*
* During the actual blocking state, the GST_PAD_BLOCKING flag is set.
* The GST_PAD_BLOCKING flag is unset when the GST_PAD_FLUSHING flag is
* unset. This is to know whether the pad was blocking when GST_PAD_FLUSHING
* The GST_PAD_BLOCKING flag is unset when the pad was unblocked without a
* flush. This is to know whether the pad was blocking when GST_PAD_FLUSHING
* was set.
*
* MT safe.
......@@ -3242,6 +3249,10 @@ handle_pad_block (GstPad * pad)
GST_OBJECT_UNLOCK (pad);
callback (pad, TRUE, user_data);
GST_OBJECT_LOCK (pad);
/* we released the lock, recheck flushing */
if (GST_PAD_IS_FLUSHING (pad))
goto flushing;
} else {
/* no callback, signal the thread that is doing a GCond wait
* if any. */
......@@ -3252,9 +3263,6 @@ handle_pad_block (GstPad * pad)
* then could have made the pad unblock so we need to check the blocking
* condition again. */
while (GST_PAD_IS_BLOCKED (pad)) {
if (GST_PAD_IS_FLUSHING (pad))
goto flushing;
/* now we block the streaming thread. It can be unlocked when we
* deactivate the pad (which will also set the FLUSHING flag) or
* when the pad is unblocked. A flushing event will also unblock
......@@ -3267,11 +3275,11 @@ handle_pad_block (GstPad * pad)
/* see if we got unlocked by a flush or not */
if (GST_PAD_IS_FLUSHING (pad))
goto flushing;
}
/* If we made it here we either never blocked, or were unblocked because we
* weren't flushing, it is therefore safe to remove the BLOCKING flag */
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKING);
/* If we made it here we were unblocked and not flushing, remove the
* blocking flag now. */
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKING);
}
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got unblocked");
......@@ -3883,24 +3891,21 @@ gst_pad_push_event (GstPad * pad, GstEvent * event)
case GST_EVENT_FLUSH_STOP:
GST_PAD_UNSET_FLUSHING (pad);
/* If pad was blocking on something when the pad received flush-start, we
* don't forward the flush-stop event either. */
/* If pad was blocking on something when the pad received flush-start, the
* BLOCKING flag was never cleared. we don't forward the flush-stop event
* either then but unset the blocking flag. */
if (G_UNLIKELY (GST_PAD_IS_BLOCKING (pad))) {
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKING);
GST_LOG_OBJECT (pad,
"Pad was previously blocking, not forwarding flush-stop");
goto flushed;
}
GST_OBJECT_FLAG_UNSET (pad, GST_PAD_BLOCKING);
break;
default:
if (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) {
if (GST_PAD_IS_FLUSHING (pad))
while (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad))) {
/* block the event as long as the pad is blocked */
if (handle_pad_block (pad) != GST_FLOW_OK)
goto flushed;
while (GST_PAD_IS_BLOCKED (pad))
/* else block the event as long as the pad is blocked */
if (handle_pad_block (pad) != GST_FLOW_OK)
goto flushed;
}
break;
}
......@@ -3942,7 +3947,6 @@ not_linked:
GST_OBJECT_UNLOCK (pad);
return FALSE;
}
flushed:
{
GST_DEBUG_OBJECT (pad,
......@@ -4049,7 +4053,7 @@ gst_pad_send_event (GstPad * pad, GstEvent * event)
goto flushing;
if (serialized) {
/* lock order: STREAM_LOCK, LOCK */
/* lock order: STREAM_LOCK, LOCK, recheck flushing. */
GST_OBJECT_UNLOCK (pad);
GST_PAD_STREAM_LOCK (pad);
need_unlock = TRUE;
......
......@@ -2326,7 +2326,7 @@ gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
case GST_FORMAT_TIME:
{
GstClockTime now, base;
gint64 time, accum;
gint64 time, accum, duration;
gdouble rate;
gint64 last;
......@@ -2361,6 +2361,11 @@ gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
else
time = 0;
if (GST_CLOCK_TIME_IS_VALID (basesink->segment.stop))
duration = basesink->segment.stop - basesink->segment.start;
else
duration = 0;
base = GST_ELEMENT_CAST (basesink)->base_time;
accum = basesink->segment.accum;
rate = basesink->segment.rate * basesink->segment.applied_rate;
......@@ -2379,7 +2384,11 @@ gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
* rate and applied rate. */
base += accum;
base = MIN (now, base);
/* for negative rate this will count back from the segment time */
/* for negative rates we need to count back from from the segment
* duration. */
if (rate < 0.0)
time += duration;
*cur = time + gst_guint64_to_gdouble (now - base) * rate;
/* never report more than last seen position */
......
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