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Added a signal which notifies when a required dparam is added.

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Original commit message from CVS:
Added a signal which notifies when a required dparam is added.
Added gst_dpman_bypass_dparam so that some dparams can be exposed as object properties as well.  If the object property is set, a connected dparam is disconnected to avoid the two subsystems fighting over setting the value.
This commit is contained in:
Steve Baker 2002-04-02 09:03:21 +00:00
parent c02b4ef60d
commit b2fa9adc50
2 changed files with 49 additions and 3 deletions
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49
libs/gst/control/dparammanager.c
View file

@ -24,6 +24,10 @@
#include <gst/gstinfo.h>
static GHashTable *_element_registry;
enum {
NEW_REQUIRED_DPARAM,
LAST_SIGNAL
};
static void gst_dpman_class_init (GstDParamManagerClass *klass);
static void gst_dpman_init (GstDParamManager *dpman);
@ -37,6 +41,7 @@ static guint gst_dpman_preprocess_noop(GstDParamManager *dpman, guint frames, gi
static guint gst_dpman_process_noop(GstDParamManager *dpman, guint frame_count);
static GObjectClass *parent_class;
static guint gst_dpman_signals[LAST_SIGNAL] = { 0 };
void
_gst_dpman_initialize()
@ -87,6 +92,13 @@ gst_dpman_class_init (GstDParamManagerClass *klass)
gst_dpman_preprocess_noop, gst_dpman_process_noop, NULL, NULL);
_element_registry = g_hash_table_new(NULL,NULL);
gst_dpman_signals[NEW_REQUIRED_DPARAM] =
g_signal_new ("new_required_dparam", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDParamManagerClass, new_required_dparam), NULL, NULL,
gst_marshal_VOID__STRING, G_TYPE_NONE, 1,
G_TYPE_STRING);
}
static void
@ -164,6 +176,8 @@ gst_dpman_add_required_dparam_callback (GstDParamManager *dpman,
dpwrap->update_func = update_func;
dpwrap->update_data = update_data;
g_signal_emit (G_OBJECT (dpman), gst_dpman_signals[NEW_REQUIRED_DPARAM], 0, g_param_spec_get_name(param_spec));
return TRUE;
}
@ -196,6 +210,8 @@ gst_dpman_add_required_dparam_direct (GstDParamManager *dpman,
dpwrap->update_data = update_data;
g_signal_emit (G_OBJECT (dpman), gst_dpman_signals[NEW_REQUIRED_DPARAM], 0, g_param_spec_get_name(param_spec));
return TRUE;
}
@ -228,6 +244,8 @@ gst_dpman_add_required_dparam_array (GstDParamManager *dpman,
dpwrap->update_data = update_data;
g_signal_emit (G_OBJECT (dpman), gst_dpman_signals[NEW_REQUIRED_DPARAM], 0, g_param_spec_get_name(param_spec));
return TRUE;
}
@ -359,7 +377,7 @@ gst_dpman_get_dparam_type (GstDParamManager *dpman, gchar *name)
return G_VALUE_TYPE(dpwrap->value);
}
/*GstDParamSpec**
GParamSpec**
gst_dpman_list_dparam_specs(GstDParamManager *dpman)
{
GstDParamWrapper* dpwrap;
@ -381,7 +399,6 @@ gst_dpman_list_dparam_specs(GstDParamManager *dpman)
}
return param_specs;
}
*/
GParamSpec*
gst_dpman_get_param_spec (GstDParamManager *dpman, gchar *dparam_name)
@ -528,6 +545,34 @@ gst_dpman_set_rate_change_pad(GstDParamManager *dpman, GstPad *pad)
G_CALLBACK (gst_dpman_caps_changed), dpman);
}
/**
* gst_dpman_bypass_dparam:
* @dpman: GstDParamManager instance
* @dparam_name: the name of dparam
*
* If a dparam is attached to this dparam_name, it will be detached
* and a warning will be issued. This should be called in the _set_property
* function of an element if the value it changes is also changed by a dparam.
*
*/
void
gst_dpman_bypass_dparam(GstDParamManager *dpman, gchar *dparam_name)
{
GstDParamWrapper* dpwrap;
g_return_if_fail (dpman != NULL);
g_return_if_fail (GST_IS_DPMAN (dpman));
g_return_if_fail (dparam_name != NULL);
dpwrap = gst_dpman_get_wrapper(dpman, dparam_name);
g_return_if_fail (dpwrap != NULL);
if (dpwrap->dparam != NULL){
g_warning("Bypassing attached dparam '%s'. It will be detached", dparam_name);
gst_dpman_detach_dparam(dpman, dparam_name);
}
}
static GstDParamWrapper*
gst_dpman_get_wrapper(GstDParamManager *dpman, gchar *dparam_name)
{

3
libs/gst/control/dparammanager.h
View file

@ -80,7 +80,7 @@ struct _GstDParamManager {
struct _GstDParamManagerClass {
GstObjectClass parent_class;
void (*new_required_dparam) (GstDParamManager *dpman, gchar* dparam_name);
GHashTable *modes;
/* signal callbacks */
};
@ -155,6 +155,7 @@ GParamSpec* gst_dpman_get_param_spec (GstDParamManager *dpman, gchar *dparam_nam
void gst_dpman_dparam_spec_has_changed (GstDParamManager *dpman, gchar *dparam_name);
void gst_dpman_set_rate_change_pad(GstDParamManager *dpman, GstPad *pad);
void gst_dpman_bypass_dparam(GstDParamManager *dpman, gchar *dparam_name);
gboolean gst_dpman_set_mode(GstDParamManager *dpman, gchar *modename);
void gst_dpman_register_mode (GstDParamManagerClass *klass,