/// <summary>
/// Wraps the passed byte array in a GStreamer buffer object
/// </summary>
/// <param name="data">C# byte pointer to be wrapped</param>
/// <returns>GstBuffer pointer wrapping data argument</returns>
public static GstBuffer BufferNewWrapped(byte[] data)
{
ulong size = (ulong)data.Length;
return(GstNativeMethods.gst_buffer_new_wrapped_full(
MemoryFlags.GST_MEMORY_FLAG_READONLY | MemoryFlags.GST_MEMORY_FLAG_NO_SHARE,
data, size, 0, size, GPointer.Zero, GPointer.Zero));
}
/// <summary>
/// Changes state of a GStreamer element
/// </summary>
/// <param name="element">element which its state needs to be changed</param>
/// <param name="state">new state the element should transition into</param>
/// <returns></returns>
public static StateChangeReturn ElementSetState(GstEelement element, State state)
{
if (element == GstEelement.Zero)
{
return(StateChangeReturn.GST_STATE_CHANGE_FAILURE);
}
return(GstNativeMethods.gst_element_set_state(element, state));
}
/// <summary>
/// Pushes a buffer into AppSrc when it "needs data"
/// </summary>
/// <param name="appsrc">AppSrc requesting a buffer</param>
/// <param name="buffer">buffer to be pushed into AppSrc</param>
/// <returns>status of the buffer push (FLOW_OK on success)</returns>
public static FlowReturn AppSrcPushBuffer(AppSrc appsrc, GstBuffer buffer)
{
if (appsrc == AppSrc.Zero || buffer == GstBuffer.Zero)
{
return(FlowReturn.GST_FLOW_ERROR);
}
return(GstNativeMethods.gst_app_src_push_buffer(appsrc, buffer));
}
/// <summary>
/// Looks up a child element in a GstBin by name
/// </summary>
/// <param name="bin">parent bin</param>
/// <param name="name">child element</param>
/// <returns>child element on success. Use ObjectUnref when you are done.</returns>
public static GstEelement BinGetByName(GstEelement bin, string name)
{
if (bin == GstEelement.Zero)
{
return(GstEelement.Zero);
}
return(GstNativeMethods.gst_bin_get_by_name(bin, name));
}
/// <summary>
/// Decreases ref count of a GStreamer object
/// </summary>
/// <param name="element">GStreamer object</param>
public static void ObjectUnref(GstEelement element)
{
if (element == GstEelement.Zero)
{
return;
}
GstNativeMethods.gst_object_unref(element);
}
/// <summary>
/// Returns the version of GStreamer being used.
/// Throws if DLL is not present.
/// </summary>
/// <returns>Version of the GStreamer library</returns>
public static Version GetVersion()
{
Version version = new Version();
GstNativeMethods.gst_version(
ref version.Major,
ref version.Minor,
ref version.Patch,
ref version.Nano);
return(version);
}
/// <summary>
/// wrapper for gst_parse_launch
/// </summary>
/// <param name="pipeline">pipeline desription (in GstLaunch in syntax)</param>
/// <returns>a pointer to the pipeline if successful</returns>
public static GstEelement ParseLaunch(string pipeline)
{
return(GstNativeMethods.gst_parse_launch(pipeline, GPointer.Zero));
}
/// <summary>
/// Attempts to initialize GStreamer. Safe to call when DLL is not present.
/// </summary>
/// <returns>true if initialized or false if (not initialized or DLL is not found)</returns>
public static bool Initialize()
{
try { return(GstNativeMethods.gst_init_check(GPointer.Zero, GPointer.Zero, GPointer.Zero)); }
catch (DllNotFoundException) { return(false); }
}
