gstreamer/gstreamer-sharp/Controller.custom

[DllImport ("libgstcontroller-0.10.dll") ]
static extern IntPtr gst_controller_new_list (IntPtr objekt, IntPtr list);

public Controller (Gst.GLib.Object objekt, string[] properties) : base (IntPtr.Zero) {
  if (GetType () != typeof (Controller)) {
    throw new InvalidOperationException ("Can't override this constructor.");
  }
  Gst.GLib.List list = new Gst.GLib.List (properties, typeof (string), true, true);

  Raw = gst_controller_new_list (objekt == null ? IntPtr.Zero : objekt.Handle, list == null ? IntPtr.Zero : list.Handle);
}

public Controller (Gst.GLib.Object objekt, string property) : this (objekt, new string[] {property}) { }

[DllImport ("libgstcontroller-0.10.dll") ]
static extern bool gst_controller_remove_properties_list (IntPtr raw, IntPtr list);

public bool RemoveProperties (string[] properties) {
  Gst.GLib.List list = new Gst.GLib.List (properties, typeof (string), true, true);

  bool raw_ret = gst_controller_remove_properties_list (Handle, list == null ? IntPtr.Zero : list.Handle);
  bool ret = raw_ret;
  return ret;
}

public bool RemoveProperty (string property) {
  return RemoveProperties (new string[] {property});
}


[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gst__controllersharp_gst__controller_controller_get_properties_offset ();

static uint properties_offset = gst__controllersharp_gst__controller_controller_get_properties_offset ();
public string[] Properties {
  get {
    Gst.GLib.List properties_list;

    unsafe {
      IntPtr* raw_ptr = (IntPtr*) ( ( (byte*) Handle) + properties_offset);
      properties_list = new Gst.GLib.List ( (*raw_ptr), typeof (string));
    }

    string[] properties = new string[properties_list.Count];
    for (int i = 0; i < properties_list.Count; i++)
      properties[i] = (string) properties_list[i];

    return properties;
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gst__controllersharp_gst__controller_controller_get_object_offset ();

static uint object_offset = gst__controllersharp_gst__controller_controller_get_object_offset ();
public Gst.GLib.Object Object {
  get {
    unsafe {
      IntPtr* raw_ptr = (IntPtr*) ( ( (byte*) Handle) + object_offset);
      return Gst.GLib.Object.GetObject ( (*raw_ptr));
    }
  }
}

[StructLayout (LayoutKind.Sequential) ]
struct GstValueArray {
  public IntPtr property_name;
  public int nbsamples;
  public ulong sample_interval;
  public IntPtr values;
}

[DllImport ("libgstcontroller-0.10.dll") ]
static extern bool gst_controller_get_value_array (IntPtr raw, ulong timestamp, ref GstValueArray value_array);

[DllImport ("libglib-2.0-0.dll") ]
static extern IntPtr g_try_malloc (int size);

static readonly Type[] supported_types = new Type[] {
  typeof (string),
  typeof (short),
  typeof (ushort),
  typeof (int),
  typeof (uint),
  typeof (long),
  typeof (ulong),
  typeof (float),
  typeof (double),
  typeof (bool)
};

public System.Array GetValueArray (string property, ulong timestamp, int nsamples, ulong interval) {
  GstValueArray va = new GstValueArray ();

  Gst.Object ob = (Gst.Object) this.Object;
  Gst.PropertyInfo pi = ob.GetPropertyInfo (property);
  System.Type t = (System.Type) pi.GType;

  bool supported = false;
  foreach (System.Type tmp in supported_types)
    if (tmp == t)
      supported = true;
  if (!supported)
    throw new Exception ("Unsupported type '" + t + "'");

  int eltsize = Marshal.SizeOf (t);
  va.values = g_try_malloc (eltsize * nsamples);
  if (va.values == IntPtr.Zero)
    throw new OutOfMemoryException ();

  va.property_name = Gst.GLib.Marshaller.StringToPtrGStrdup (property);
  va.nbsamples = nsamples;
  va.sample_interval = interval;

  bool raw_ret = gst_controller_get_value_array (Handle, timestamp, ref va);

  if (!raw_ret) {
    Gst.GLib.Marshaller.Free (va.property_name);
    Gst.GLib.Marshaller.Free (va.values);
    return null;
  }

  System.Array values = Array.CreateInstance (t, nsamples);

  if (t == typeof (string)) {
    string[] ret = (string[]) values;

    for (int i = 0; i < nsamples; i++) {
      IntPtr str = Marshal.ReadIntPtr (va.values, i * IntPtr.Size);
      ret[i] = Gst.GLib.Marshaller.PtrToStringGFree (str);
    }
  } else if (t == typeof (short)) {
    short[] ret = (short[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = Marshal.ReadInt16 (va.values, i * 2);
    }
  } else if (t == typeof (ushort)) {
    ushort[] ret = (ushort[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = (ushort) Marshal.ReadInt16 (va.values, i * 2);
    }
  } else if (t == typeof (int)) {
    int[] ret = (int[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = Marshal.ReadInt32 (va.values, i * 4);
    }
  } else if (t == typeof (uint)) {
    uint[] ret = (uint[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = (uint) Marshal.ReadInt32 (va.values, i * 4);
    }
  } else if (t == typeof (long)) {
    long[] ret = (long[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = Marshal.ReadInt64 (va.values, i * 8);
    }
  } else if (t == typeof (ulong)) {
    ulong[] ret = (ulong[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = (ulong) Marshal.ReadInt64 (va.values, i * 8);
    }
  } else if (t == typeof (float)) {
    float[] ret = (float[]) values;
    Marshal.Copy (va.values, ret, 0, nsamples);
  } else if (t == typeof (double)) {
    double[] ret = (double[]) values;
    Marshal.Copy (va.values, ret, 0, nsamples);
  } else if (t == typeof (bool)) {
    bool[] ret = (bool[]) values;

    for (int i = 0; i < nsamples; i++) {
      ret[i] = Marshal.ReadInt32 (va.values, i * 4) != 0;
    }
  }

  Gst.GLib.Marshaller.Free (va.property_name);
  Gst.GLib.Marshaller.Free (va.values);

  return values;
}