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docs/gst/gstreamer-sections.txt: Add GstClockClass vmethod docs.

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Original commit message from CVS:
* docs/gst/gstreamer-sections.txt:
Add GstClockClass vmethod docs.
* gst/gstcaps.h:
Mark #endif with comment for associated #if
* gst/gstclock.c: (gst_clock_id_wait):
* gst/gstclock.h:
Add vmethod wait_jitter to avoid an unneeded _get_time() for
most clock implementations.
Document vmethods.
Flesh out docs about resolution methods.
API: GstClockClass::wait_jitter
* gst/gstsystemclock.c: (gst_system_clock_class_init),
(gst_system_clock_async_thread),
(gst_system_clock_id_wait_jitter_unlocked),
(gst_system_clock_id_wait_jitter):
Use base class wait_jitter variant for improved performance
due to less clock polling.
This commit is contained in:
Wim Taymans 2006-08-11 15:24:03 +00:00
parent 38f5745fa8
commit f0eeee3342
6 changed files with 92 additions and 28 deletions
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23
ChangeLog
View file

@ -1,3 +1,26 @@
2006-08-11 Wim Taymans <wim@fluendo.com>
* docs/gst/gstreamer-sections.txt:
Add GstClockClass vmethod docs.
* gst/gstcaps.h:
Mark #endif with comment for associated #if
* gst/gstclock.c: (gst_clock_id_wait):
* gst/gstclock.h:
Add vmethod wait_jitter to avoid an unneeded _get_time() for
most clock implementations.
Document vmethods.
Flesh out docs about resolution methods.
API: GstClockClass::wait_jitter
* gst/gstsystemclock.c: (gst_system_clock_class_init),
(gst_system_clock_async_thread),
(gst_system_clock_id_wait_jitter_unlocked),
(gst_system_clock_id_wait_jitter):
Use base class wait_jitter variant for improved performance
due to less clock polling.
2006-08-11 Edward Hervey <edward@fluendo.com>
* gst/gst.c: (gst_init_check), (init_post):

2
docs/gst/gstreamer-sections.txt
View file

@ -285,6 +285,7 @@ gst_child_proxy_get_type
<FILE>gstclock</FILE>
<TITLE>GstClock</TITLE>
GstClock
GstClockClass
GstClockTime
GstClockTimeDiff
GstClockID
@ -338,7 +339,6 @@ gst_clock_id_unref
GST_TYPE_CLOCK_TIME
<SUBSECTION Standard>
GstClockClass
GST_CLOCK
GST_IS_CLOCK
GST_TYPE_CLOCK

3
gst/gstcaps.h
View file

@ -94,7 +94,8 @@ typedef enum {
*/
#define GST_DEBUG_CAPS(string, caps) \
GST_DEBUG ( string "%s: " GST_PTR_FORMAT, caps)
#endif
#endif /* GST_DISABLE_DEPRECATED */
/**
* GST_STATIC_CAPS:

39
gst/gstclock.c
View file

@ -333,7 +333,6 @@ gst_clock_id_get_time (GstClockID id)
return GST_CLOCK_ENTRY_TIME ((GstClockEntry *) id);
}
/**
* gst_clock_id_wait
* @id: The #GstClockID to wait on
@ -386,20 +385,29 @@ gst_clock_id_wait (GstClockID id, GstClockTimeDiff * jitter)
cclass = GST_CLOCK_GET_CLASS (clock);
if (G_UNLIKELY (cclass->wait == NULL))
goto not_supported;
GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock, "waiting on clock entry %p", id);
if (jitter) {
GstClockTime now = gst_clock_get_time (clock);
/* if we have a wait_jitter function, use that */
if (G_LIKELY (cclass->wait_jitter)) {
res = cclass->wait_jitter (clock, entry, jitter);
} else {
/* check if we have a simple _wait function otherwise. The function without
* the jitter arg is less optimal as we need to do an additional _get_time()
* which is not atomic with the _wait() and a typical _wait() function does
* yet another _get_time() anyway. */
if (G_UNLIKELY (cclass->wait == NULL))
goto not_supported;
/* jitter is the diff against the clock when this entry is scheduled. Negative
* values mean that the entry was in time, a positive value means that the
* entry was too late. */
*jitter = GST_CLOCK_DIFF (requested, now);
if (jitter) {
GstClockTime now = gst_clock_get_time (clock);
/* jitter is the diff against the clock when this entry is scheduled. Negative
* values mean that the entry was in time, a positive value means that the
* entry was too late. */
*jitter = GST_CLOCK_DIFF (requested, now);
}
res = cclass->wait (clock, entry);
}
res = cclass->wait (clock, entry);
GST_CAT_DEBUG_OBJECT (GST_CAT_CLOCK, clock,
"done waiting entry %p, res: %d", id, res);
@ -669,7 +677,11 @@ gst_clock_finalize (GObject * object)
* @clock: a #GstClock
* @resolution: The resolution to set
*
* Set the accuracy of the clock.
* Set the accuracy of the clock. Some clocks have the possibility to operate
* with different accuracy at the expense of more resource usage. There is
* normally no need to change the default resolution of a clock. The resolution
* of a clock can only be changed if the clock has the
* #GST_CLOCK_FLAG_CAN_SET_RESOLUTION flag set.
*
* Returns: the new resolution of the clock.
*/
@ -694,7 +706,8 @@ gst_clock_set_resolution (GstClock * clock, GstClockTime resolution)
* gst_clock_get_resolution
* @clock: a #GstClock
*
* Get the accuracy of the clock.
* Get the accuracy of the clock. The accuracy of the clock is the granularity
* of the values returned by gst_clock_get_time().
*
* Returns: the resolution of the clock in units of #GstClockTime.
*

24
gst/gstclock.h
View file

@ -413,10 +413,27 @@ struct _GstClock {
GstClockTime _gst_reserved[GST_PADDING];
};
/**
* GstClockClass:
* @parent_class: the parent class structure
* @change_resolution: change the resolution of the clock. Not all values might
* be acceptable. The new resolution should be returned.
* @get_resolution: get the resolution of the clock.
* @get_internal_time: get the internal unadjusted time of the clock.
* @wait: perform a blocking wait for the given GstClockEntry. Deprecated,
* implement @wait_jitter instead.
* @wait_async: perform an asynchronous wait for the given GstClockEntry.
* @unschedule: unblock a blocking or async wait operation.
* @wait_jitter: perform a blocking wait on the given GstClockEntry and return
* the jitter.
*
* GStreamer clock class. Override the vmethods to implement the clock
* functionality.
*/
struct _GstClockClass {
GstObjectClass parent_class;
/*< protected >*/
/*< public >*/
/* vtable */
GstClockTime (*change_resolution) (GstClock *clock,
GstClockTime old_resolution,
@ -430,8 +447,11 @@ struct _GstClockClass {
GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
void (*unschedule) (GstClock *clock, GstClockEntry *entry);
/* ABI added to replace the deprecated wait */
GstClockReturn (*wait_jitter) (GstClock *clock, GstClockEntry *entry,
GstClockTimeDiff *jitter);
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
gpointer _gst_reserved[GST_PADDING - 1];
};
GType gst_clock_get_type (void);

29
gst/gstsystemclock.c
View file

@ -55,10 +55,10 @@ static void gst_system_clock_dispose (GObject * object);
static GstClockTime gst_system_clock_get_internal_time (GstClock * clock);
static guint64 gst_system_clock_get_resolution (GstClock * clock);
static GstClockReturn gst_system_clock_id_wait (GstClock * clock,
GstClockEntry * entry);
static GstClockReturn gst_system_clock_id_wait_unlocked
(GstClock * clock, GstClockEntry * entry);
static GstClockReturn gst_system_clock_id_wait_jitter (GstClock * clock,
GstClockEntry * entry, GstClockTimeDiff * jitter);
static GstClockReturn gst_system_clock_id_wait_jitter_unlocked
(GstClock * clock, GstClockEntry * entry, GstClockTimeDiff * jitter);
static GstClockReturn gst_system_clock_id_wait_async (GstClock * clock,
GstClockEntry * entry);
static void gst_system_clock_id_unschedule (GstClock * clock,
@ -113,7 +113,7 @@ gst_system_clock_class_init (GstSystemClockClass * klass)
gstclock_class->get_internal_time = gst_system_clock_get_internal_time;
gstclock_class->get_resolution = gst_system_clock_get_resolution;
gstclock_class->wait = gst_system_clock_id_wait;
gstclock_class->wait_jitter = gst_system_clock_id_wait_jitter;
gstclock_class->wait_async = gst_system_clock_id_wait_async;
gstclock_class->unschedule = gst_system_clock_id_unschedule;
}
@ -270,7 +270,9 @@ gst_system_clock_async_thread (GstClock * clock)
}
/* now wait for the entry, we already hold the lock */
res = gst_system_clock_id_wait_unlocked (clock, (GstClockID) entry);
res =
gst_system_clock_id_wait_jitter_unlocked (clock, (GstClockID) entry,
NULL);
switch (res) {
case GST_CLOCK_UNSCHEDULED:
@ -362,7 +364,8 @@ gst_system_clock_get_resolution (GstClock * clock)
* MT safe.
*/
static GstClockReturn
gst_system_clock_id_wait_unlocked (GstClock * clock, GstClockEntry * entry)
gst_system_clock_id_wait_jitter_unlocked (GstClock * clock,
GstClockEntry * entry, GstClockTimeDiff * jitter)
{
GstClockTime entryt, real, now, target;
GstClockTimeDiff diff;
@ -372,6 +375,9 @@ gst_system_clock_id_wait_unlocked (GstClock * clock, GstClockEntry * entry)
entryt = GST_CLOCK_ENTRY_TIME (entry);
now = gst_clock_adjust_unlocked (clock, real);
if (jitter) {
*jitter = GST_CLOCK_DIFF (entryt, now);
}
diff = entryt - now;
target = gst_system_clock_get_internal_time (clock) + diff;
@ -413,13 +419,13 @@ gst_system_clock_id_wait_unlocked (GstClock * clock, GstClockEntry * entry)
(final - target),
((double) (GstClockTimeDiff) (final - target)) / GST_SECOND);
#endif
break;
} else {
/* the waiting is interrupted because the GCond was signaled. This can
* be because this or some other entry was unscheduled. */
GST_CAT_DEBUG (GST_CAT_CLOCK, "entry %p unlocked with signal", entry);
/* if the entry is unscheduled, we can stop waiting for it */
/* if the entry is unscheduled, we can stop waiting for it, else we
* continue our while loop. */
if (entry->status == GST_CLOCK_UNSCHEDULED)
break;
}
@ -433,12 +439,13 @@ gst_system_clock_id_wait_unlocked (GstClock * clock, GstClockEntry * entry)
}
static GstClockReturn
gst_system_clock_id_wait (GstClock * clock, GstClockEntry * entry)
gst_system_clock_id_wait_jitter (GstClock * clock, GstClockEntry * entry,
GstClockTimeDiff * jitter)
{
GstClockReturn ret;
GST_OBJECT_LOCK (clock);
ret = gst_system_clock_id_wait_unlocked (clock, entry);
ret = gst_system_clock_id_wait_jitter_unlocked (clock, entry, jitter);
GST_OBJECT_UNLOCK (clock);
return ret;