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remove the "iterate_started" signal and replace it with pre_iterate and post_iterate callbacks.

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Original commit message from CVS:
remove the "iterate_started" signal and replace it with pre_iterate and post_iterate callbacks.

Apps can now put a lock around an iterate so they can do stuff on the bin from another thread. much nicer than the signal approach.
This commit is contained in:
Steve Baker 2002-06-10 16:48:47 +00:00
parent 0ce34c4a17
commit a415cdd34e
2 changed files with 54 additions and 7 deletions
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51
gst/gstbin.c
View file

@ -59,7 +59,6 @@ static void gst_bin_restore_thyself (GstObject * object, xmlNodePtr self);
enum
{
OBJECT_ADDED,
ITERATE_STARTED,
LAST_SIGNAL
};
@ -114,10 +113,6 @@ gst_bin_class_init (GstBinClass * klass)
g_signal_new ("object_added", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstBinClass, object_added), NULL, NULL,
gst_marshal_VOID__POINTER, G_TYPE_NONE, 1, G_TYPE_POINTER);
gst_bin_signals[ITERATE_STARTED] =
g_signal_new ("iterate_started", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstBinClass, iterate_started), NULL, NULL,
gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_bin_dispose);
@ -140,6 +135,11 @@ gst_bin_init (GstBin * bin)
bin->numchildren = 0;
bin->children = NULL;
bin->pre_iterate_func = NULL;
bin->post_iterate_func = NULL;
bin->pre_iterate_private = NULL;
bin->post_iterate_private = NULL;
bin->iterate_mutex = g_mutex_new ();
bin->iterate_cond = g_cond_new ();
@ -850,11 +850,15 @@ gst_bin_iterate (GstBin * bin)
oclass = GST_BIN_CLASS (G_OBJECT_GET_CLASS (bin));
g_signal_emit (G_OBJECT (bin), gst_bin_signals[ITERATE_STARTED], 0);
if (bin->pre_iterate_func)
(bin->pre_iterate_func) (bin, bin->pre_iterate_private);
if (oclass->iterate)
running = (oclass->iterate) (bin);
if (bin->post_iterate_func)
(bin->post_iterate_func) (bin, bin->post_iterate_private);
GST_DEBUG_LEAVE ("(\"%s\") %d", GST_ELEMENT_NAME (bin), running);
if (!running) {
@ -869,3 +873,38 @@ gst_bin_iterate (GstBin * bin)
return running;
}
/**
* gst_bin_set_pre_iterate_function:
* @bin: #Gstbin to attach to
* @func: callback function to call
* @func_data: private data to put in the function call
*
* Attaches a callback which will be run before every iteration of the bin
*
*/
void
gst_bin_set_pre_iterate_function (GstBin *bin, GstBinPrePostIterateFunction func, gpointer func_data)
{
g_return_if_fail (GST_IS_BIN (bin));
bin->pre_iterate_func = func;
bin->pre_iterate_private = func_data;
}
/**
* gst_bin_set_post_iterate_function:
* @bin: #Gstbin to attach to
* @func: callback function to call
* @func_data: private data to put in the function call
*
* Attaches a callback which will be run after every iteration of the bin
*
*/
void
gst_bin_set_post_iterate_function (GstBin *bin, GstBinPrePostIterateFunction func, gpointer func_data)
{
g_return_if_fail (GST_IS_BIN (bin));
bin->post_iterate_func = func;
bin->post_iterate_private = func_data;
}

10
gst/gstbin.h
View file

@ -48,6 +48,8 @@ extern GType _gst_bin_type;
# define GST_BIN_CLASS GST_BIN_CLASS_CAST
#endif
typedef void (*GstBinPrePostIterateFunction) (GstBin *bin, gpointer data);
typedef enum {
/* this bin is a manager of child elements, i.e. a pipeline or thread */
GST_BIN_FLAG_MANAGER = GST_ELEMENT_FLAG_LAST,
@ -80,6 +82,11 @@ struct _GstBin {
GstElementState child_states[GST_NUM_STATES];
gpointer sched_private;
GstBinPrePostIterateFunction pre_iterate_func;
GstBinPrePostIterateFunction post_iterate_func;
gpointer pre_iterate_private;
gpointer post_iterate_private;
};
struct _GstBinClass {
@ -88,7 +95,6 @@ struct _GstBinClass {
/* signals */
void (*object_added) (GstObject *object, GstObject *child);
void (*object_removed) (GstObject *object, GstObject *child);
void (*iterate_started) (GstObject *object);
/* change the state of elements of the given type */
gboolean (*change_state_type) (GstBin *bin,
@ -125,6 +131,8 @@ void gst_bin_auto_clock (GstBin *bin);
void gst_bin_child_state_change (GstBin *bin, GstElementState oldstate,
GstElementState newstate, GstElement *child);
void gst_bin_set_pre_iterate_function (GstBin *bin, GstBinPrePostIterateFunction func, gpointer func_data);
void gst_bin_set_post_iterate_function (GstBin *bin, GstBinPrePostIterateFunction func, gpointer func_data);
#ifdef __cplusplus
}
#endif /* __cplusplus */