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autoconvert: Support installing identity as the initial child
Add the 'initial-identity' property, which inserts identity for at startup for event passing, and replaces it with a new child when the first buffer (and caps) actually arrives. https://bugzilla.gnome.org/show_bug.cgi?id=599469
This commit is contained in:
Jan Schmidt
parent
55a3f6a08c
commit
32ebb79f0b
2 changed files with 128 additions and 62 deletions
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@ -45,6 +45,8 @@
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GST_DEBUG_CATEGORY (autoconvert_debug);
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#define GST_CAT_DEFAULT (autoconvert_debug)
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#define DEFAULT_INITIAL_IDENTITY FALSE
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#define GST_AUTOCONVERT_LOCK(ac) GST_OBJECT_LOCK (ac)
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#define GST_AUTOCONVERT_UNLOCK(ac) GST_OBJECT_UNLOCK (ac)
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@ -81,7 +83,8 @@ enum
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enum
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{
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PROP_0,
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PROP_FACTORIES
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PROP_FACTORIES,
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PROP_INITIAL_IDENTITY
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};
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static void gst_auto_convert_set_property (GObject * object,
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@ -94,7 +97,7 @@ static GstStateChangeReturn gst_auto_convert_change_state (GstElement * element,
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GstStateChange transition);
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static GstElement *gst_auto_convert_get_subelement (GstAutoConvert *
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autoconvert);
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autoconvert, gboolean query_only);
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static GstPad *gst_auto_convert_get_internal_sinkpad (GstAutoConvert *
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autoconvert);
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static GstPad *gst_auto_convert_get_internal_srcpad (GstAutoConvert *
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@ -137,6 +140,11 @@ static const GstQueryType *gst_auto_convert_internal_src_query_type (GstPad *
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pad);
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static GList *gst_auto_convert_load_factories (GstAutoConvert * autoconvert);
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static GstElement
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* gst_auto_convert_get_or_make_element_from_factory (GstAutoConvert *
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autoconvert, GstElementFactory * factory);
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static gboolean gst_auto_convert_activate_element (GstAutoConvert * autoconvert,
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GstElement * element, GstCaps * caps);
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static GQuark internal_srcpad_quark = 0;
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static GQuark internal_sinkpad_quark = 0;
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@ -191,6 +199,13 @@ gst_auto_convert_class_init (GstAutoConvertClass * klass)
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" elements), can only be set once",
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_INITIAL_IDENTITY,
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g_param_spec_boolean ("initial-identity",
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"Install identity initially",
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"If true, then the identity element will be installed initially "
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"and used for event passing until the first data buffer arrives ",
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DEFAULT_INITIAL_IDENTITY, G_PARAM_READWRITE));
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gstelement_class->change_state =
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GST_DEBUG_FUNCPTR (gst_auto_convert_change_state);
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}
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@ -229,6 +244,8 @@ gst_auto_convert_init (GstAutoConvert * autoconvert,
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gst_element_add_pad (GST_ELEMENT (autoconvert), autoconvert->srcpad);
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gst_segment_init (&autoconvert->sink_segment, GST_FORMAT_UNDEFINED);
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autoconvert->initial_identity = DEFAULT_INITIAL_IDENTITY;
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}
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static void
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@ -279,6 +296,11 @@ gst_auto_convert_set_property (GObject * object,
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" have been set or auto-discovered");
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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break;
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case PROP_INITIAL_IDENTITY:
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GST_AUTOCONVERT_LOCK (autoconvert);
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autoconvert->initial_identity = g_value_get_boolean (value);
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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break;
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}
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}
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@ -297,6 +319,11 @@ gst_auto_convert_get_property (GObject * object,
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g_value_set_pointer (value, &autoconvert->factories);
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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break;
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case PROP_INITIAL_IDENTITY:
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GST_AUTOCONVERT_LOCK (autoconvert);
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g_value_set_boolean (value, autoconvert->initial_identity);
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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break;
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}
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}
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@ -440,15 +467,41 @@ get_pad_by_direction (GstElement * element, GstPadDirection direction)
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}
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static GstElement *
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gst_auto_convert_get_subelement (GstAutoConvert * autoconvert)
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gst_auto_convert_get_subelement (GstAutoConvert * autoconvert,
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gboolean query_only)
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{
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GstElement *element = NULL;
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gboolean initial_identity;
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GST_AUTOCONVERT_LOCK (autoconvert);
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if (autoconvert->current_subelement)
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element = gst_object_ref (autoconvert->current_subelement);
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initial_identity = autoconvert->initial_identity;
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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if (G_UNLIKELY (!query_only && element == NULL && initial_identity)) {
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/* No current sub-element - create an identity and install it */
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GstElementFactory *identity_feature;
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GstElement *identity;
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GST_INFO_OBJECT (autoconvert,
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"No existing child element - instantiating identity");
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/* if the identity feature doesn't exist - something is very wrong */
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identity_feature =
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GST_ELEMENT_FACTORY_CAST (gst_default_registry_find_feature ("identity",
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GST_TYPE_ELEMENT_FACTORY));
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identity =
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gst_auto_convert_get_or_make_element_from_factory (autoconvert,
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identity_feature);
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if (identity
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&& gst_auto_convert_activate_element (autoconvert, identity, NULL)) {
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GST_AUTOCONVERT_LOCK (autoconvert);
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if (autoconvert->current_subelement)
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element = gst_object_ref (autoconvert->current_subelement);
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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}
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}
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return element;
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}
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@ -509,8 +562,6 @@ gst_auto_convert_add_element (GstAutoConvert * autoconvert,
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return NULL;
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}
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gst_object_ref (element);
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srcpad = get_pad_by_direction (element, GST_PAD_SRC);
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if (!srcpad) {
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GST_ERROR_OBJECT (autoconvert, "Could not find source in %s",
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@ -595,11 +646,13 @@ gst_auto_convert_add_element (GstAutoConvert * autoconvert,
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/* Iffy */
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gst_element_sync_state_with_parent (element);
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/* Increment the reference count we will return to the caller */
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gst_object_ref (element);
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return element;
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error:
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gst_bin_remove (GST_BIN (autoconvert), element);
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gst_object_unref (element);
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return NULL;
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}
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@ -686,6 +739,52 @@ factory_can_intersect (GstAutoConvert * autoconvert,
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return ret;
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}
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static gboolean
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gst_auto_convert_activate_element (GstAutoConvert * autoconvert,
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GstElement * element, GstCaps * caps)
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{
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GstPad *internal_srcpad = g_object_get_qdata (G_OBJECT (element),
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internal_srcpad_quark);
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GstPad *internal_sinkpad = g_object_get_qdata (G_OBJECT (element),
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internal_sinkpad_quark);
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if (caps) {
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/* check if the element can really accept said caps */
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if (!gst_pad_peer_accept_caps (internal_srcpad, caps)) {
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GST_DEBUG_OBJECT (autoconvert, "Could not set %s:%s to %"
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GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (internal_srcpad), caps);
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return FALSE;
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}
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}
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gst_pad_set_fixatecaps_function (autoconvert->sinkpad,
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gst_auto_convert_sink_fixatecaps);
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GST_AUTOCONVERT_LOCK (autoconvert);
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autoconvert->current_subelement = element;
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autoconvert->current_internal_srcpad = internal_srcpad;
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autoconvert->current_internal_sinkpad = internal_sinkpad;
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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GST_INFO_OBJECT (autoconvert,
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"Selected element %s",
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GST_OBJECT_NAME (GST_OBJECT (autoconvert->current_subelement)));
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/* Send new-segment event if we have one */
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if (autoconvert->sink_segment.format != GST_FORMAT_UNDEFINED) {
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GstEvent *event;
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GstSegment *seg = &autoconvert->sink_segment;
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event = gst_event_new_new_segment_full (TRUE,
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seg->rate, seg->applied_rate, seg->format, seg->start,
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seg->stop, seg->time);
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autoconvert->drop_newseg = TRUE;
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gst_pad_push_event (internal_srcpad, event);
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autoconvert->drop_newseg = FALSE;
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}
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return TRUE;
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}
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/*
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* If there is already an internal element, it will try to call set_caps on it
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*
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@ -706,7 +805,7 @@ gst_auto_convert_sink_setcaps (GstPad * pad, GstCaps * caps)
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g_return_val_if_fail (autoconvert != NULL, FALSE);
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subelement = gst_auto_convert_get_subelement (autoconvert);
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subelement = gst_auto_convert_get_subelement (autoconvert, TRUE);
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if (subelement) {
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if (gst_pad_peer_accept_caps (autoconvert->current_internal_srcpad, caps)) {
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/* If we can set the new caps on the current element,
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@ -750,8 +849,6 @@ gst_auto_convert_sink_setcaps (GstPad * pad, GstCaps * caps)
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for (elem = factories; elem; elem = g_list_next (elem)) {
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GstElementFactory *factory = GST_ELEMENT_FACTORY (elem->data);
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GstElement *element;
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GstPad *internal_srcpad = NULL;
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GstPad *internal_sinkpad = NULL;
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/* Lets first check if according to the static pad templates on the factory
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* these caps have any chance of success
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@ -774,55 +871,15 @@ gst_auto_convert_sink_setcaps (GstPad * pad, GstCaps * caps)
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}
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/* The element had a chance of success, lets make it */
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element =
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gst_auto_convert_get_or_make_element_from_factory (autoconvert,
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factory);
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if (!element) {
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if (!element)
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continue;
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}
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internal_srcpad = g_object_get_qdata (G_OBJECT (element),
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internal_srcpad_quark);
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internal_sinkpad = g_object_get_qdata (G_OBJECT (element),
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internal_sinkpad_quark);
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/* Now we check if the element can really accept said caps */
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if (!gst_pad_peer_accept_caps (internal_srcpad, caps)) {
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GST_DEBUG_OBJECT (autoconvert, "Could not set %s:%s to %" GST_PTR_FORMAT,
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GST_DEBUG_PAD_NAME (internal_srcpad), caps);
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goto next_element;
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}
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gst_pad_set_fixatecaps_function (autoconvert->sinkpad,
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gst_auto_convert_sink_fixatecaps);
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GST_AUTOCONVERT_LOCK (autoconvert);
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autoconvert->current_subelement = element;
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autoconvert->current_internal_srcpad = internal_srcpad;
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autoconvert->current_internal_sinkpad = internal_sinkpad;
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GST_AUTOCONVERT_UNLOCK (autoconvert);
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/* Send new-segment event if we have one */
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if (autoconvert->sink_segment.format != GST_FORMAT_UNDEFINED) {
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GstEvent *event;
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GstSegment *seg = &autoconvert->sink_segment;
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event = gst_event_new_new_segment_full (TRUE,
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seg->rate, seg->applied_rate, seg->format, seg->start,
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seg->stop, seg->time);
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autoconvert->drop_newseg = TRUE;
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gst_pad_push_event (internal_srcpad, event);
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autoconvert->drop_newseg = FALSE;
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}
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GST_INFO_OBJECT (autoconvert,
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"Selected element %s",
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GST_OBJECT_NAME (GST_OBJECT (autoconvert->current_subelement)));
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break;
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next_element:
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continue;
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/* And make it the current child */
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if (gst_auto_convert_activate_element (autoconvert, element, caps))
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break;
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}
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get_out:
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@ -979,7 +1036,7 @@ gst_auto_convert_sink_chain (GstPad * pad, GstBuffer * buffer)
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ret = gst_pad_push (internal_srcpad, buffer);
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gst_object_unref (internal_srcpad);
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if (GST_FLOW_IS_FATAL (ret)) {
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GstElement *child = gst_auto_convert_get_subelement (autoconvert);
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GstElement *child = gst_auto_convert_get_subelement (autoconvert, TRUE);
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GST_DEBUG_OBJECT (autoconvert,
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"Child element %" GST_PTR_FORMAT "returned flow %s", child,
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gst_flow_get_name (ret));
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@ -1024,6 +1081,15 @@ gst_auto_convert_sink_event (GstPad * pad, GstEvent * event)
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}
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internal_srcpad = gst_auto_convert_get_internal_srcpad (autoconvert);
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if (internal_srcpad == NULL) {
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/* Query the subelement - triggers creation of an identity if necessary */
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GstElement *subelement =
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gst_auto_convert_get_subelement (autoconvert, FALSE);
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if (subelement)
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gst_object_unref (subelement);
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internal_srcpad = gst_auto_convert_get_internal_srcpad (autoconvert);
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}
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if (internal_srcpad) {
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ret = gst_pad_push_event (internal_srcpad, event);
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gst_object_unref (internal_srcpad);
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@ -1063,7 +1129,7 @@ gst_auto_convert_sink_query (GstPad * pad, GstQuery * query)
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GstAutoConvert *autoconvert = GST_AUTO_CONVERT (gst_pad_get_parent (pad));
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GstElement *subelement;
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subelement = gst_auto_convert_get_subelement (autoconvert);
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subelement = gst_auto_convert_get_subelement (autoconvert, TRUE);
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if (subelement) {
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GstPad *sub_sinkpad = get_pad_by_direction (subelement, GST_PAD_SINK);
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@ -1090,7 +1156,7 @@ gst_auto_convert_sink_query_type (GstPad * pad)
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GstAutoConvert *autoconvert = GST_AUTO_CONVERT (gst_pad_get_parent (pad));
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GstElement *subelement;
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subelement = gst_auto_convert_get_subelement (autoconvert);
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subelement = gst_auto_convert_get_subelement (autoconvert, TRUE);
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if (subelement) {
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GstPad *sub_sinkpad = get_pad_by_direction (subelement, GST_PAD_SINK);
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@ -1113,7 +1179,7 @@ gst_auto_convert_sink_fixatecaps (GstPad * pad, GstCaps * caps)
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GstAutoConvert *autoconvert = GST_AUTO_CONVERT (gst_pad_get_parent (pad));
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GstElement *subelement;
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subelement = gst_auto_convert_get_subelement (autoconvert);
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subelement = gst_auto_convert_get_subelement (autoconvert, TRUE);
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if (subelement) {
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GstPad *sinkpad = get_pad_by_direction (subelement, GST_PAD_SINK);
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gst_pad_fixate_caps (sinkpad, caps);
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@ -1187,10 +1253,8 @@ gst_auto_convert_sink_getcaps (GstPad * pad)
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element =
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gst_auto_convert_get_or_make_element_from_factory (autoconvert,
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factory);
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if (!element) {
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if (!element)
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continue;
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}
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internal_srcpad = g_object_get_qdata (G_OBJECT (element),
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internal_srcpad_quark);
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@ -1297,7 +1361,7 @@ gst_auto_convert_src_query (GstPad * pad, GstQuery * query)
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GstAutoConvert *autoconvert = GST_AUTO_CONVERT (gst_pad_get_parent (pad));
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GstElement *subelement;
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subelement = gst_auto_convert_get_subelement (autoconvert);
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subelement = gst_auto_convert_get_subelement (autoconvert, TRUE);
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if (subelement) {
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GstPad *sub_srcpad = get_pad_by_direction (subelement, GST_PAD_SRC);
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@ -1324,7 +1388,7 @@ gst_auto_convert_src_query_type (GstPad * pad)
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GstAutoConvert *autoconvert = GST_AUTO_CONVERT (gst_pad_get_parent (pad));
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GstElement *subelement;
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subelement = gst_auto_convert_get_subelement (autoconvert);
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subelement = gst_auto_convert_get_subelement (autoconvert, TRUE);
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if (subelement) {
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GstPad *sub_srcpad = get_pad_by_direction (subelement, GST_PAD_SRC);
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@ -56,6 +56,8 @@ struct _GstAutoConvert
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GList *cached_events;
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GstSegment sink_segment;
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gboolean drop_newseg;
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gboolean initial_identity;
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};
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struct _GstAutoConvertClass
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