static gpointer
_get_decoder_factories (gpointer arg)
{
GstElementClass *klass = arg;
GList *factories;
GstPadTemplate *templ = gst_element_class_get_pad_template (klass,
"sink");
RsnDecFactoryFilterCtx ctx = { NULL, };
GstCaps *raw;
gboolean raw_audio;
ctx.desired_caps = gst_pad_template_get_caps (templ);
raw = gst_caps_from_string ("audio/x-raw-float");
raw_audio = gst_caps_can_intersect (raw, ctx.desired_caps);
if (raw_audio) {
GstCaps *sub = gst_caps_subtract (ctx.desired_caps, raw);
ctx.desired_caps = sub;
} else {
gst_caps_ref (ctx.desired_caps);
}
gst_caps_unref (raw);
/* Set decoder caps to empty. Will be filled by the factory_filter */
ctx.decoder_caps = gst_caps_new_empty ();
GST_DEBUG ("Finding factories for caps: %" GST_PTR_FORMAT, ctx.desired_caps);
factories = gst_default_registry_feature_filter (
(GstPluginFeatureFilter) rsndec_factory_filter, FALSE, &ctx);
/* If these are audio caps, we add audioconvert, which is not a decoder,
but allows raw audio to go through relatively unmolested - this will
come handy when we have to send placeholder silence to allow preroll
for those DVDs which have titles with no audio track. */
if (raw_audio) {
GstPluginFeature *feature;
GST_DEBUG ("These are audio caps, adding audioconvert");
feature =
gst_default_registry_find_feature ("audioconvert",
GST_TYPE_ELEMENT_FACTORY);
if (feature) {
factories = g_list_append (factories, feature);
} else {
GST_WARNING ("Could not find feature audioconvert");
}
}
factories = g_list_sort (factories, (GCompareFunc) sort_by_ranks);
GST_DEBUG ("Available decoder caps %" GST_PTR_FORMAT, ctx.decoder_caps);
gst_caps_unref (ctx.decoder_caps);
gst_caps_unref (ctx.desired_caps);
return factories;
}
static int
print_element_features (const gchar * element_name)
{
GstPluginFeature *feature;
/* FIXME implement other pretty print function for these */
feature = gst_default_registry_find_feature (element_name,
GST_TYPE_INDEX_FACTORY);
if (feature) {
n_print ("%s: an index\n", element_name);
return 0;
}
feature = gst_default_registry_find_feature (element_name,
GST_TYPE_TYPE_FIND_FACTORY);
if (feature) {
n_print ("%s: a typefind function\n", element_name);
return 0;
}
return -1;
}
gboolean
have_element (const gchar * element_name)
{
GstPluginFeature *feature;
feature = gst_default_registry_find_feature (element_name,
GST_TYPE_ELEMENT_FACTORY);
if (feature) {
g_object_unref (feature);
return TRUE;
}
return FALSE;
}
static GstElement *
gst_auto_convert_get_subelement (GstAutoConvert * autoconvert,
gboolean query_only)
{
GstElement *element = NULL;
gboolean initial_identity;
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_subelement)
element = gst_object_ref (autoconvert->current_subelement);
initial_identity = autoconvert->initial_identity;
GST_AUTOCONVERT_UNLOCK (autoconvert);
if (G_UNLIKELY (!query_only && element == NULL && initial_identity)) {
/* No current sub-element - create an identity and install it */
GstElementFactory *identity_feature;
GstElement *identity;
GST_INFO_OBJECT (autoconvert,
"No existing child element - instantiating identity");
/* if the identity feature doesn't exist - something is very wrong */
identity_feature =
GST_ELEMENT_FACTORY_CAST (gst_default_registry_find_feature ("identity",
GST_TYPE_ELEMENT_FACTORY));
identity =
gst_auto_convert_get_or_make_element_from_factory (autoconvert,
identity_feature);
if (identity
&& gst_auto_convert_activate_element (autoconvert, identity, NULL)) {
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_subelement)
element = gst_object_ref (autoconvert->current_subelement);
GST_AUTOCONVERT_UNLOCK (autoconvert);
}
}
return element;
}
