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nlecomposition: Use a bus message to retrieve pipeline position

Browse source 
Instead of recursing up, as this will allow to have nested composition
run inside auxiliary pipelines. It is a bit cleaner also.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5983>
This commit is contained in:
Thibault Saunier 2023-08-13 11:50:53 -04:00 committed by GStreamer Marge Bot
parent 79c211a5fb
commit 1627a944e7
1 changed files with 77 additions and 21 deletions
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98
subprojects/gst-editing-services/plugins/nle/nlecomposition.c
View file

@ -45,7 +45,6 @@ GST_DEBUG_CATEGORY_STATIC (nlecomposition_debug);
#define _do_init \
GST_DEBUG_CATEGORY_INIT (nlecomposition_debug,"nlecomposition", GST_DEBUG_FG_BLUE | GST_DEBUG_BOLD, "NLE Composition");
#define nle_composition_parent_class parent_class
#define QUERY_NEEDS_INITIALIZATION_SEEK_MESSAGE_STRUCT_NAME "nlecomposition-query-needs-initialization-seek"
enum
{
@ -231,6 +230,23 @@ G_DEFINE_BOXED_TYPE (NleCompositionQueryNeedsInitializationSeek,
g_atomic_rc_box_acquire, g_atomic_rc_box_release);
/* *INDENT-ON* */
#define QUERY_PIPELINE_POSITION_STRUCT_NAME "nlecomposition-query-pipeline-position"
typedef struct
{
GMutex lock;
GstClockTime position;
gboolean answered;
} NleCompositionQueryPipelinePosition;
/* *INDENT-OFF* */
#define NLE_TYPE_COMPOSITION_QUERY_PIPELINE_POSITION nle_composition_query_pipeline_position_get_type ()
GType nle_composition_query_pipeline_position_get_type (void) G_GNUC_CONST;
G_DEFINE_BOXED_TYPE (NleCompositionQueryPipelinePosition,
nle_composition_query_pipeline_position,
g_atomic_rc_box_acquire, g_atomic_rc_box_release);
/* *INDENT-ON* */
static guint _signals[LAST_SIGNAL] = { 0 };
static GParamSpec *nleobject_properties[NLEOBJECT_PROP_LAST];
@ -1039,8 +1055,7 @@ nle_composition_handle_message (GstBin * bin, GstMessage * message)
GST_DEBUG_OBJECT (comp, "Dropping message %" GST_PTR_FORMAT " from "
"object being teared down to READY!", message);
goto drop;
} else if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ELEMENT &&
GST_MESSAGE_SRC (message) != GST_OBJECT_CAST (comp)) {
} else if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ELEMENT) {
const GstStructure *structure = gst_message_get_structure (message);
if (gst_structure_has_name (structure,
@ -1061,6 +1076,36 @@ nle_composition_handle_message (GstBin * bin, GstMessage * message)
g_atomic_rc_box_release (q);
return;
} else if (gst_structure_has_name (structure,
QUERY_PIPELINE_POSITION_STRUCT_NAME)) {
NleCompositionQueryPipelinePosition *q;
/* First let parents answer */
GST_BIN_CLASS (parent_class)->handle_message (bin, message);
gst_structure_get (structure, "query",
NLE_TYPE_COMPOSITION_QUERY_PIPELINE_POSITION, &q, NULL);
g_assert (q);
g_mutex_lock (&q->lock);
if (!q->answered) {
GstClockTime position = get_current_position (comp);
if (position > NLE_OBJECT_STOP (GST_MESSAGE_SRC (message))
|| position < NLE_OBJECT_START (GST_MESSAGE_SRC (message))) {
GST_INFO_OBJECT (comp,
"Global position outside of querying subcomposition, returning TIME_NONE");
position = GST_CLOCK_TIME_NONE;
}
q->answered = TRUE;
q->position = position;
}
g_mutex_unlock (&q->lock);
/* We recursed up already */
return;
}
}
@ -1772,22 +1817,6 @@ get_current_position (NleComposition * comp)
parent = gst_object_get_parent (GST_OBJECT (comp));
while ((tmp = parent)) {
if (NLE_IS_COMPOSITION (parent)) {
GstClockTime parent_position =
get_current_position (NLE_COMPOSITION (parent));
if (parent_position > NLE_OBJECT_STOP (comp)
|| parent_position < NLE_OBJECT_START (comp)) {
GST_INFO_OBJECT (comp,
"Global position outside of subcomposition, returning TIME_NONE");
return GST_CLOCK_TIME_NONE;
}
value =
parent_position - NLE_OBJECT_START (comp) + NLE_OBJECT_INPOINT (comp);
}
if (GST_IS_PIPELINE (parent)) {
if (gst_element_query_position (GST_ELEMENT (parent), GST_FORMAT_TIME,
&value)) {
@ -1797,7 +1826,6 @@ get_current_position (NleComposition * comp)
}
}
parent = gst_object_get_parent (GST_OBJECT (parent));
gst_object_unref (tmp);
}
@ -1855,6 +1883,34 @@ beach:
return (guint64) value;
}
static GstClockTime
query_ancestors_position (NleComposition * comp)
{
GstClockTime res;
NleCompositionQueryPipelinePosition *q =
g_atomic_rc_box_new0 (NleCompositionQueryPipelinePosition);
GstStructure *structure =
gst_structure_new (QUERY_PIPELINE_POSITION_STRUCT_NAME,
"query", NLE_TYPE_COMPOSITION_QUERY_PIPELINE_POSITION,
g_atomic_rc_box_acquire (q), NULL);
GstMessage *message = gst_message_new_element (GST_OBJECT (comp), structure);
if (!gst_element_post_message (GST_ELEMENT (comp), message)) {
GST_ERROR_OBJECT (comp, "Querying ancestor position failed");
}
g_mutex_lock (&q->lock);
if (q->answered) {
res = q->position;
} else {
res = get_current_position (comp);
}
g_mutex_unlock (&q->lock);
g_atomic_rc_box_release (q);
return res;
}
/* WITH OBJECTS LOCK TAKEN */
static gboolean
_seek_current_stack (NleComposition * comp, GstEvent * event,
@ -2613,7 +2669,7 @@ _commit_func (NleComposition * comp, UpdateCompositionData * ucompo)
/* Get current so that it represent the duration it was
* before commiting children */
curpos = get_current_position (comp);
curpos = query_ancestors_position (comp);
if (!_commit_all_values (comp, ucompo->reason)) {
GST_DEBUG_OBJECT (comp, "Nothing to commit, leaving");