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https://github.com/go-gst/go-gst.git
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103 lines
3.6 KiB
Go
103 lines
3.6 KiB
Go
package gst
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/*
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#include "gst.go.h"
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*/
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import "C"
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import "unsafe"
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// ElementClass represents the subclass of an element provided by a plugin.
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type ElementClass struct{ *ObjectClass }
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// Instance returns the underlying GstElementClass instance.
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func (e *ElementClass) Instance() *C.GstElementClass {
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return C.toGstElementClass(e.Unsafe())
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}
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// AddMetadata sets key with the given value in the metadata of the class.
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func (e *ElementClass) AddMetadata(key, value string) {
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C.gst_element_class_add_static_metadata(
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e.Instance(),
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(*C.gchar)(C.CString(key)),
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(*C.gchar)(C.CString(value)),
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)
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}
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// AddPadTemplate adds a padtemplate to an element class. This is mainly used in the
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// ClassInit functions of ObjectSubclasses. If a pad template with the same name as an
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// already existing one is added the old one is replaced by the new one.
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//
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// templ's reference count will be incremented, and any floating reference will be removed
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func (e *ElementClass) AddPadTemplate(templ *PadTemplate) {
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C.gst_element_class_add_pad_template(
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e.Instance(),
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templ.Instance(),
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)
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}
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// AddStaticPadTemplate adds a pad template to an element class based on the pad template templ. The template
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// is first converted to a static pad template.
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//
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// This is mainly used in the ClassInit functions of element implementations. If a pad template with the
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// same name already exists, the old one is replaced by the new one.
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func (e *ElementClass) AddStaticPadTemplate(templ *PadTemplate) {
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staticTmpl := C.GstStaticPadTemplate{
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name_template: templ.Instance().name_template,
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direction: templ.Instance().direction,
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presence: templ.Instance().presence,
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static_caps: C.GstStaticCaps{
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caps: templ.Caps().Instance(),
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string: C.CString(templ.Name()),
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},
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}
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C.gst_element_class_add_static_pad_template(
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e.Instance(),
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&staticTmpl,
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)
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}
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// GetMetadata retrieves the metadata associated with key in the class.
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func (e *ElementClass) GetMetadata(key string) string {
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ckey := C.CString(key)
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defer C.free(unsafe.Pointer(ckey))
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return C.GoString(C.gst_element_class_get_metadata(e.Instance(), (*C.gchar)(ckey)))
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}
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// GetPadTemplate retrieves the padtemplate with the given name. No unrefing is necessary.
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// If no pad template exists with the given name, nil is returned.
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func (e *ElementClass) GetPadTemplate(name string) *PadTemplate {
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cname := C.CString(name)
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defer C.free(unsafe.Pointer(cname))
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tmpl := C.gst_element_class_get_pad_template(e.Instance(), (*C.gchar)(cname))
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if tmpl == nil {
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return nil
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}
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return wrapPadTemplate(toGObject(unsafe.Pointer(tmpl)))
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}
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// GetAllPadTemplates retrieves a slice of all the pad templates associated with this class.
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// The list must not be modified.
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func (e *ElementClass) GetAllPadTemplates() []*PadTemplate {
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glist := C.gst_element_class_get_pad_template_list(e.Instance())
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return glistToPadTemplateSlice(glist)
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}
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// SetMetadata sets the detailed information for this class.
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//
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// `longname` - The english long name of the element. E.g "File Sink"
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//
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// `classification` - A string describing the type of element, as an unordered list separated with slashes ('/'). E.g: "Sink/File"
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//
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// `description` - Sentence describing the purpose of the element. E.g: "Write stream to a file"
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//
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// `author` - Name and contact details of the author(s). Use \n to separate multiple author metadata. E.g: "Joe Bloggs <joe.blogs at foo.com>"
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func (e *ElementClass) SetMetadata(longname, classification, description, author string) {
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C.gst_element_class_set_static_metadata(
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e.Instance(),
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(*C.gchar)(C.CString(longname)),
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(*C.gchar)(C.CString(classification)),
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(*C.gchar)(C.CString(description)),
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(*C.gchar)(C.CString(author)),
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)
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}
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