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aggregator: add min-upstream-latency property.

Browse source 
This is exposed as a solution to the use case of plugging in
sources with a higher latency after the aggregator has started
playing with an initial set of sources, allowing to avoid resyncing.

https://bugzilla.gnome.org/show_bug.cgi?id=797213
This commit is contained in:
Mathieu Duponchelle 2018-09-27 12:42:30 +02:00
parent 2fee579747
commit 97e2e7a63d
1 changed files with 35 additions and 0 deletions
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35
libs/gst/base/gstaggregator.c
View file

@ -333,6 +333,8 @@ struct _GstAggregatorPrivate
GstClockTime sub_latency_min; /* protected by src_lock */
GstClockTime sub_latency_max; /* protected by src_lock */
GstClockTime upstream_latency_min; /* protected by src_lock */
/* aggregate */
GstClockID aggregate_id; /* protected by src_lock */
GMutex src_lock;
@ -366,6 +368,7 @@ typedef struct
} EventData;
#define DEFAULT_LATENCY 0
#define DEFAULT_MIN_UPSTREAM_LATENCY 0
#define DEFAULT_START_TIME_SELECTION GST_AGGREGATOR_START_TIME_SELECTION_ZERO
#define DEFAULT_START_TIME (-1)
@ -373,6 +376,7 @@ enum
{
PROP_0,
PROP_LATENCY,
PROP_MIN_UPSTREAM_LATENCY,
PROP_START_TIME_SELECTION,
PROP_START_TIME,
PROP_LAST
@ -1742,6 +1746,16 @@ gst_aggregator_query_latency_unlocked (GstAggregator * self, GstQuery * query)
return FALSE;
}
if (self->priv->upstream_latency_min > min) {
GstClockTimeDiff diff =
GST_CLOCK_DIFF (min, self->priv->upstream_latency_min);
min += diff;
if (GST_CLOCK_TIME_IS_VALID (max)) {
max += diff;
}
}
if (min > max && GST_CLOCK_TIME_IS_VALID (max)) {
GST_ELEMENT_WARNING (self, CORE, CLOCK, (NULL),
("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
@ -2265,6 +2279,11 @@ gst_aggregator_set_property (GObject * object, guint prop_id,
case PROP_LATENCY:
gst_aggregator_set_latency_property (agg, g_value_get_uint64 (value));
break;
case PROP_MIN_UPSTREAM_LATENCY:
SRC_LOCK (agg);
agg->priv->upstream_latency_min = g_value_get_uint64 (value);
SRC_UNLOCK (agg);
break;
case PROP_START_TIME_SELECTION:
agg->priv->start_time_selection = g_value_get_enum (value);
break;
@ -2287,6 +2306,11 @@ gst_aggregator_get_property (GObject * object, guint prop_id,
case PROP_LATENCY:
g_value_set_uint64 (value, gst_aggregator_get_latency_property (agg));
break;
case PROP_MIN_UPSTREAM_LATENCY:
SRC_LOCK (agg);
g_value_set_uint64 (value, agg->priv->upstream_latency_min);
SRC_UNLOCK (agg);
break;
case PROP_START_TIME_SELECTION:
g_value_set_enum (value, agg->priv->start_time_selection);
break;
@ -2346,6 +2370,16 @@ gst_aggregator_class_init (GstAggregatorClass * klass)
"position (in nanoseconds)", 0, G_MAXUINT64,
DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MIN_UPSTREAM_LATENCY,
g_param_spec_uint64 ("min-upstream-latency", "Buffer latency",
"When sources with a higher latency are expected to be plugged "
"in dynamically after the aggregator has started playing, "
"this allows overriding the minimum latency reported by the "
"initial source(s). This is only taken into account when superior "
"to the reported minimum latency.",
0, G_MAXUINT64,
DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_START_TIME_SELECTION,
g_param_spec_enum ("start-time-selection", "Start Time Selection",
"Decides which start time is output",
@ -2403,6 +2437,7 @@ gst_aggregator_init (GstAggregator * self, GstAggregatorClass * klass)
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
self->priv->upstream_latency_min = DEFAULT_MIN_UPSTREAM_LATENCY;
self->priv->latency = DEFAULT_LATENCY;
self->priv->start_time_selection = DEFAULT_START_TIME_SELECTION;
self->priv->start_time = DEFAULT_START_TIME;