initial commit

gst/gst_bin.go

@@ -0,0 +1,72 @@
+package gst
+
+/*
+#cgo pkg-config: gstreamer-1.0
+#cgo CFLAGS: -Wno-deprecated-declarations -g -Wall
+#include <gst/gst.h>
+#include "gst.go.h"
+*/
+import "C"
+import (
+	"fmt"
+	"unsafe"
+)
+
+// Bin is a go wrapper arounds a GstBin.
+type Bin struct{ *Element }
+
+// Instance returns the underlying GstBin instance.
+func (b *Bin) Instance() *C.GstBin { return C.toGstBin(b.unsafe()) }
+
+// GetElementByName returns the element with the given name. Unref after usage.
+func (b *Bin) GetElementByName(name string) (*Element, error) {
+	cName := C.CString(name)
+	defer C.free(unsafe.Pointer(cName))
+	elem := C.gst_bin_get_by_name((*C.GstBin)(b.Instance()), (*C.gchar)(cName))
+	if elem == nil {
+		return nil, fmt.Errorf("Could not find element with name %s", name)
+	}
+	return wrapElement(elem), nil
+}
+
+// GetElements returns a list of the elements added to this pipeline. Unref
+// elements after usage.
+func (b *Bin) GetElements() ([]*Element, error) {
+	iterator := C.gst_bin_iterate_elements((*C.GstBin)(b.Instance()))
+	return iteratorToElementSlice(iterator)
+}
+
+// GetSourceElements returns a list of all the source elements in this pipeline. Unref
+// elements after usafe.
+func (b *Bin) GetSourceElements() ([]*Element, error) {
+	iterator := C.gst_bin_iterate_sources((*C.GstBin)(b.Instance()))
+	return iteratorToElementSlice(iterator)
+}
+
+// GetSinkElements returns a list of all the sink elements in this pipeline. Unref
+// elements after usage.
+func (b *Bin) GetSinkElements() ([]*Element, error) {
+	iterator := C.gst_bin_iterate_sinks((*C.GstBin)(b.Instance()))
+	return iteratorToElementSlice(iterator)
+}
+
+// Add wraps `gst_bin_add`.
+func (b *Bin) Add(elem *Element) error {
+	if ok := C.gst_bin_add((*C.GstBin)(b.Instance()), (*C.GstElement)(elem.Instance())); !gobool(ok) {
+		return fmt.Errorf("Failed to add element to pipeline: %s", elem.Name())
+	}
+	return nil
+}
+
+// AddMany is a go implementation of `gst_bin_add_many` to compensate for the inability
+// to use variadic functions in cgo.
+func (b *Bin) AddMany(elems ...*Element) error {
+	for _, elem := range elems {
+		if err := b.Add(elem); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func wrapBin(bin *C.GstBin) *Bin { return &Bin{wrapElement(&bin.element)} }