gstreamer:我如何传递结构作为参数g_object_set()

gstreamer : how do I pass structure as a argument to g_object_set()?

本文关键字：object set 参数 何传递 结构 gstreamer      更新时间：2023-10-16

大家好，我目前能够一次设置一个属性到gstreamer插件，如fallow。

GstElement *source = gst_bin_get_by_name (GST_BIN (m_pu_pipeline), "ue");
g_object_set(G_OBJECT(source), "objectLeftEnabled", settings.m_b_left, NULL);           
g_object_set(G_OBJECT(source), "objectRemovedEnabled", settings.m_b_removed, NULL);

但是我想一次设置整个结构，就像fallow。

g_object_set (G_OBJECT (source), "lettremoved-settings", settings,  NULL);

下面是我到目前为止所做的直接设置结构的gstreamer插件。

struct _LeftRemoved
{
    bool left;
    bool removed;
}; 
//Declaration of copy and free function.
static gpointer lr_copy (gpointer data);
static void lr_free (gpointer data);
G_DEFINE_BOXED_TYPE (_Leftremoved, lettremoved_settings,
                     lr_copy,
                     lr_free);  
//Defination of copy and free.
static gpointer lr_copy (gpointer data)
{
  struct _LeftRemoved *details = (struct _LeftRemoved *)data;
  struct _LeftRemoved *copy = g_new (struct _LeftRemoved, 1);
  // We need to copy 
  copy->left= details->left;
  copy->removed = details->removed;
  g_print("Set Property From Copy left=%dn",copy->left);
  g_print("Set Property From Copy removed=%dn",copy->removed);
  return (gpointer) copy;
}

static void lr_free (gpointer data)
{
        //code for free memory.
}
enum ePropertyType
{
   PROP_OBJ_LR
}
static void gst_ivue_class_init (GstIVUEClass * klass)
{  
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gobject_class->set_property = gst_ivue_set_property;
  gobject_class->get_property = gst_ivue_get_property;
  gobject_class->finalize = gst_ivue_finalize;
  GParamSpec *pspec;
  pspec = g_param_spec_boxed ("lettremoved_settings",     "lettremoved_settings", "Left Removed Settings",lettremoved_settings_get_type(), (GParamFlags)G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_OBJ_LR, pspec);
}
static void gst_ivue_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
{
   GstIVUE *filter = GST_IVUE (object);
    switch (prop_id)
    {
       case PROP_OBJ_LR:
            g_boxed_copy(lettremoved_settings_get_type(),&value);
            break;
       default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
} 
static void gst_ivue_get_property( GObject* object, guint prop_id, GValue* value, GParamSpec* pspec )
{
     GstIVUE* filter = GST_IVUE (object);
     switch (prop_id) 
     {
         case PROP_OBJ_LR:
             // Also I don't know how to get value
     } 
}

上面的代码运行成功，但它不是由我提供的设置值。例如，如果我调用g_object_set()函数为:

   settings.left=true;
   settings.removed=true;
   g_object_set (G_OBJECT (source), "lettremoved-settings", settings,  NULL);

然后在复制函数中，这段代码将left和removed的默认值设置为false。请告诉我哪里做错了

g_object_set和g_object_get是varrag函数。这意味着您可以在一个调用中设置这两个:

g_object_set(G_OBJECT(source),
  "objectLeftEnabled", settings.m_b_left,
  "objectRemovedEnabled", settings.m_b_removed,
  NULL);

也仅供参考。你可以使用g_memdup()来代替g_new和手动复制。

当您尝试盒装类型时，是否传递了一个指针?可能需要调用

g_object_set (G_OBJECT (source)， "lettremoved-settings"， &settings, NULL);

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