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docs/design/draft-latency.txt: Small update.

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Original commit message from CVS:
* docs/design/draft-latency.txt:
Small update.
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_class_init),
(gst_base_sink_get_latency), (gst_base_sink_query_latency),
(gst_base_sink_wait_clock), (gst_base_sink_send_qos),
(gst_base_sink_perform_qos), (gst_base_sink_queue_object_unlocked),
(gst_base_sink_chain_unlocked), (gst_base_sink_send_event),
(gst_base_sink_get_position), (gst_base_sink_query),
(gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
API: gst_base_sink_query_latency() to let subclasses query the upstream
latency.
API: gst_base_sink_get_latency() to let subclasses query the configured
latency in the sink.
Implement query and set latency.
Update some docs.
As spotted by Will Newton <will dot newton at gmail dot com>: Make sure we
don't continue preroll when we are flushing. Fixes #405284.
* tests/check/pipelines/stress.c: (change_state_timeout),
(quit_timeout), (GST_START_TEST), (stress_suite):
Test for #405284.
This commit is contained in:
Wim Taymans 2007-02-12 11:32:22 +00:00
parent 69e7087725
commit a25cedb415
6 changed files with 267 additions and 24 deletions
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27
ChangeLog
View file

@ -1,3 +1,30 @@
2007-02-12 Wim Taymans,,, <wim@fluendo.com>
* docs/design/draft-latency.txt:
Small update.
* docs/libs/gstreamer-libs-sections.txt:
* libs/gst/base/gstbasesink.c: (gst_base_sink_class_init),
(gst_base_sink_get_latency), (gst_base_sink_query_latency),
(gst_base_sink_wait_clock), (gst_base_sink_send_qos),
(gst_base_sink_perform_qos), (gst_base_sink_queue_object_unlocked),
(gst_base_sink_chain_unlocked), (gst_base_sink_send_event),
(gst_base_sink_get_position), (gst_base_sink_query),
(gst_base_sink_change_state):
* libs/gst/base/gstbasesink.h:
API: gst_base_sink_query_latency() to let subclasses query the upstream
latency.
API: gst_base_sink_get_latency() to let subclasses query the configured
latency in the sink.
Implement query and set latency.
Update some docs.
As spotted by Will Newton <will dot newton at gmail dot com>: Make sure we
don't continue preroll when we are flushing. Fixes #405284.
* tests/check/pipelines/stress.c: (change_state_timeout),
(quit_timeout), (GST_START_TEST), (stress_suite):
Test for #405284.
2007-02-09 Tim-Philipp Müller <tim at centricular dot net>
Patch by: René Stadler <mail at renestadler de>

3
docs/design/draft-latency.txt
View file

@ -313,7 +313,8 @@ Dynamically adjusting latency
An element that want to change the latency in the pipeline can do this by
posting a LATENCY message on the bus. This message instructs the pipeline to:
- query the latency in the pipeline (which might now have changed)
- query the latency in the pipeline (which might now have changed) with a
LATENCY query.
- redistribute a new global latency to all elements with a LATENCY event.
A use case where the latency in a pipeline can change could be a network element

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

@ -176,6 +176,8 @@ gst_base_src_get_type
GstBaseSink
GstBaseSinkClass
gst_base_sink_query_latency
gst_base_sink_get_latency
gst_base_sink_wait_preroll
gst_base_sink_set_sync
gst_base_sink_get_sync

189
libs/gst/base/gstbasesink.c
View file

@ -125,8 +125,10 @@
*
* The qos property will enable the quality-of-service features of the basesink
* which gather statistics about the real-time performance of the clock
* synchronisation. For each dropped buffer it will also send a QoS message
* upstream.
* synchronisation. For each buffer received in the sink, statistics are
* gathered and a QOS event is send upstream with these numbers. This
* information can then be used by upstream elements to reduce their processing
* rate, for example.
*
* Last reviewed on 2006-09-27 (0.10.11)
*/
@ -187,6 +189,9 @@ struct _GstBaseSinkPrivate
/* number of rendered and dropped frames */
guint64 rendered;
guint64 dropped;
/* latency stuff */
GstClockTime latency;
};
#define DO_RUNNING_AVG(avg,val,size) (((val) + ((size)-1) * (avg)) / (size))
@ -286,6 +291,7 @@ static gboolean gst_base_sink_pad_activate (GstPad * pad);
static gboolean gst_base_sink_pad_activate_push (GstPad * pad, gboolean active);
static gboolean gst_base_sink_pad_activate_pull (GstPad * pad, gboolean active);
static gboolean gst_base_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_base_sink_peer_query (GstBaseSink * sink, GstQuery * query);
/* check if an object was too late */
static gboolean gst_base_sink_is_too_late (GstBaseSink * basesink,
@ -334,8 +340,9 @@ gst_base_sink_class_init (GstBaseSinkClass * klass)
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_QOS,
g_param_spec_boolean ("qos", "Qos", "Generate QoS events upstream",
DEFAULT_QOS, G_PARAM_READWRITE));
g_param_spec_boolean ("qos", "Qos",
"Generate Quality-of-Service events upstream", DEFAULT_QOS,
G_PARAM_READWRITE));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_sink_change_state);
@ -597,7 +604,7 @@ gst_base_sink_get_max_lateness (GstBaseSink * sink)
* @sink: the sink
* @enabled: the new qos value.
*
* Configures @sink to send QoS events upstream.
* Configures @sink to send Quality-of-Service events upstream.
*
* Since: 0.10.5
*/
@ -611,10 +618,10 @@ gst_base_sink_set_qos_enabled (GstBaseSink * sink, gboolean enabled)
* gst_base_sink_is_qos_enabled:
* @sink: the sink
*
* Checks if @sink is currently configured to send QoS events
* Checks if @sink is currently configured to send Quality-of-Service events
* upstream.
*
* Returns: TRUE if the sink is configured to perform QoS.
* Returns: TRUE if the sink is configured to perform Quality-of-Service.
*
* Since: 0.10.5
*/
@ -628,6 +635,101 @@ gst_base_sink_is_qos_enabled (GstBaseSink * sink)
return res;
}
/**
* gst_base_sink_get_latency:
* @sink: the sink
*
* Get the currently configured latency.
*
* Returns: The configured latency.
*
* Since: 0.10.12
*/
GstClockTime
gst_base_sink_get_latency (GstBaseSink * sink)
{
GstClockTime res;
GST_OBJECT_LOCK (sink);
res = sink->priv->latency;
GST_OBJECT_UNLOCK (sink);
return res;
}
/**
* gst_base_sink_query_latency:
* @sink: the sink
* @live: if the sink is live
* @upstream_live: if an upstream element is live
* @min_latency: the min latency of the upstream elements
* @max_latency: the max latency of the upstream elements
*
* Query the sink for the latency parameters. The latency will be queried from
* the upstream elements. @live will be TRUE if @sink is configured to
* synchronize against the clock. @upstream_live will be TRUE if an upstream
* element is live.
*
* If both @live and @upstream_live are TRUE, the sink will want to compensate
* for the latency introduced by the upstream elements by setting the
* @min_latency to a strictly possitive value.
*
* This function is mostly used by subclasses.
*
* Returns: TRUE if the query succeeded.
*
* Since: 0.10.12
*/
gboolean
gst_base_sink_query_latency (GstBaseSink * sink, gboolean * live,
gboolean * upstream_live, GstClockTime * min_latency,
GstClockTime * max_latency)
{
gboolean l, us_live, res;
GstClockTime min, max;
GstQuery *query;
/* we are live when we sync to the clock */
l = gst_base_sink_get_sync (sink);
/* assume no latency */
min = 0;
max = -1;
us_live = FALSE;
query = gst_query_new_latency ();
/* ask the peer for the latency */
if ((res = gst_base_sink_peer_query (sink, query))) {
GstClockTime us_min, us_max;
/* get upstream min and max latency */
gst_query_parse_latency (query, &us_live, &us_min, &us_max);
if (us_live) {
/* upstream live, use its latency, subclasses should use these
* values to create the complete latency. */
min = us_min;
max = us_max;
}
}
gst_query_unref (query);
GST_DEBUG_OBJECT (sink, "latency query: live: %d, upstream: %d, min %"
GST_TIME_FORMAT ", max %" GST_TIME_FORMAT, l, us_live,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
if (live)
*live = l;
if (upstream_live)
*upstream_live = us_live;
if (min_latency)
*min_latency = min;
if (max_latency)
*max_latency = max;
return res;
}
static void
gst_base_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
@ -1041,7 +1143,6 @@ gst_base_sink_wait_clock (GstBaseSink * basesink, GstClockTime time,
GstClockID id;
GstClockReturn ret;
GstClock *clock;
GstClockTime base_time;
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time)))
goto invalid_time;
@ -1053,8 +1154,11 @@ gst_base_sink_wait_clock (GstBaseSink * basesink, GstClockTime time,
if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (basesink)) == NULL))
goto no_clock;
base_time = GST_ELEMENT_CAST (basesink)->base_time;
id = gst_clock_new_single_shot_id (clock, base_time + time);
/* add base time and latency */
time += GST_ELEMENT_CAST (basesink)->base_time;
time += basesink->priv->latency;
id = gst_clock_new_single_shot_id (clock, time);
GST_OBJECT_UNLOCK (basesink);
basesink->clock_id = id;
@ -1275,7 +1379,7 @@ gst_base_sink_send_qos (GstBaseSink * basesink,
GstEvent *event;
gboolean res;
/* generate QoS event */
/* generate Quality-of-Service event */
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
"qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (time));
@ -1302,7 +1406,7 @@ gst_base_sink_perform_qos (GstBaseSink * sink, gboolean dropped)
start = priv->current_rstart;
/* if QoS disabled, do nothing */
/* if Quality-of-Service disabled, do nothing */
if (!g_atomic_int_get (&priv->qos_enabled) || start == -1)
return;
@ -1739,6 +1843,8 @@ gst_base_sink_queue_object_unlocked (GstBaseSink * basesink, GstPad * pad,
/* FIXME, do something with the return value? */
ret = gst_base_sink_render_object (basesink, pad, o);
if (ret != GST_FLOW_OK)
goto dequeue_failed;
}
/* now render the object */
@ -1763,6 +1869,13 @@ more_preroll:
g_queue_push_tail (basesink->preroll_queue, obj);
return GST_FLOW_OK;
}
dequeue_failed:
{
GST_DEBUG_OBJECT (basesink, "rendering queued objects failed, reason %s",
gst_flow_get_name (ret));
gst_mini_object_unref (obj);
return ret;
}
}
/* with STREAM_LOCK
@ -1962,10 +2075,7 @@ gst_base_sink_chain_unlocked (GstBaseSink * basesink, GstPad * pad,
if (G_UNLIKELY (!basesink->have_newsegment)) {
gboolean sync;
GST_OBJECT_LOCK (basesink);
sync = basesink->sync;
GST_OBJECT_UNLOCK (basesink);
sync = gst_base_sink_get_sync (basesink);
if (sync) {
GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
(_("Internal data flow problem.")),
@ -2359,17 +2469,36 @@ gst_base_sink_send_event (GstElement * element, GstEvent * event)
{
GstPad *pad;
GstBaseSink *basesink = GST_BASE_SINK (element);
gboolean result;
gboolean forward = TRUE, result = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_LATENCY:
{
GstClockTime latency;
gst_event_parse_latency (event, &latency);
GST_OBJECT_LOCK (element);
pad = basesink->sinkpad;
gst_object_ref (pad);
basesink->priv->latency = latency;
GST_OBJECT_UNLOCK (element);
GST_DEBUG_OBJECT (basesink, "latency set to %" GST_TIME_FORMAT,
GST_TIME_ARGS (latency));
forward = FALSE;
break;
}
default:
break;
}
if (forward) {
GST_OBJECT_LOCK (element);
pad = gst_object_ref (basesink->sinkpad);
GST_OBJECT_UNLOCK (element);
result = gst_pad_push_event (pad, event);
gst_object_unref (pad);
}
return result;
}
@ -2579,7 +2708,25 @@ gst_base_sink_query (GstElement * element, GstQuery * query)
res = gst_base_sink_peer_query (basesink, query);
break;
case GST_QUERY_LATENCY:
{
gboolean live, us_live;
GstClockTime min, max;
if ((res =
gst_base_sink_query_latency (basesink, &live, &us_live, &min,
&max))) {
/* if we or the upstream elements are not live, we don't need latency
* compensation */
if (!live || !us_live) {
GST_DEBUG_OBJECT (basesink,
"no latency compensation, we or upstream are not live");
min = 0;
max = -1;
}
gst_query_set_latency (query, live, min, max);
}
break;
}
case GST_QUERY_JITTER:
break;
case GST_QUERY_RATE:
@ -2633,6 +2780,7 @@ gst_base_sink_change_state (GstElement * element, GstStateChange transition)
basesink->priv->current_sstart = 0;
basesink->priv->current_sstop = 0;
basesink->priv->eos_rtime = -1;
basesink->priv->latency = 0;
basesink->eos = FALSE;
gst_base_sink_reset_qos (basesink);
ret = GST_STATE_CHANGE_ASYNC;
@ -2676,6 +2824,7 @@ gst_base_sink_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED");
/* FIXME, make sure we cannot enter _render first */
/* we need to call ::unlock before locking PREROLL_LOCK
* since we lock it before going into ::render */

4
libs/gst/base/gstbasesink.h
View file

@ -190,6 +190,10 @@ gint64 gst_base_sink_get_max_lateness (GstBaseSink *sink);
void gst_base_sink_set_qos_enabled (GstBaseSink *sink, gboolean enabled);
gboolean gst_base_sink_is_qos_enabled (GstBaseSink *sink);
gboolean gst_base_sink_query_latency (GstBaseSink *sink, gboolean *live, gboolean *upstream_live,
GstClockTime *min_latency, GstClockTime *max_latency);
GstClockTime gst_base_sink_get_latency (GstBaseSink *sink);
G_END_DECLS
#endif /* __GST_BASE_SINK_H__ */

60
tests/check/pipelines/stress.c
View file

@ -20,6 +20,64 @@
#include <gst/check/gstcheck.h>
static int playing = 1;
static int quit = 0;
static gboolean
change_state_timeout (gpointer data)
{
GstElement *pipeline = (GstElement *) data;
if (quit)
return FALSE;
if (playing) {
playing = 0;
gst_element_set_state (pipeline, GST_STATE_NULL);
} else {
playing = 1;
gst_element_set_state (pipeline, GST_STATE_PLAYING);
}
return TRUE;
}
static gboolean
quit_timeout (gpointer data)
{
quit = 1;
return FALSE;
}
GST_START_TEST (test_stress_preroll)
{
GstElement *fakesrc, *fakesink;
GstElement *pipeline;
fakesrc = gst_element_factory_make ("fakesrc", NULL);
fakesink = gst_element_factory_make ("fakesink", NULL);
pipeline = gst_element_factory_make ("pipeline", NULL);
g_return_if_fail (fakesrc && fakesink && pipeline);
g_object_set (G_OBJECT (fakesink), "preroll-queue-len", 4, NULL);
gst_bin_add_many (GST_BIN (pipeline), fakesrc, fakesink, NULL);
gst_element_link (fakesrc, fakesink);
gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_timeout_add (500, &change_state_timeout, pipeline);
g_timeout_add (10000, &quit_timeout, NULL);
while (!quit) {
g_main_context_iteration (NULL, TRUE);
}
gst_object_unref (pipeline);
}
GST_END_TEST;
GST_START_TEST (test_stress)
{
@ -67,6 +125,8 @@ stress_suite (void)
suite_add_tcase (s, tc_chain);
tcase_add_test (tc_chain, test_stress);
tcase_add_test (tc_chain, test_stress_preroll);
return s;
}