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Added an example state change function
Original commit message from CVS: Added an example state change function
This commit is contained in:
Wim Taymans
parent
c2a0080f90
commit
e7b4bf243f
2 changed files with 106 additions and 0 deletions
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@ -97,6 +97,8 @@ static void gst_example_set_property (GObject *object, guint prop_id,
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const GValue *value, GParamSpec *pspec);
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const GValue *value, GParamSpec *pspec);
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static void gst_example_get_property (GObject *object, guint prop_id,
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static void gst_example_get_property (GObject *object, guint prop_id,
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GValue *value, GParamSpec *pspec);
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GValue *value, GParamSpec *pspec);
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static GstElementStateReturn
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gst_example_change_state (GstElement *element);
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/* The parent class pointer needs to be kept around for some object
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/* The parent class pointer needs to be kept around for some object
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* operations.
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* operations.
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@ -179,6 +181,10 @@ gst_example_class_init (GstExampleClass *klass)
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*/
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*/
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gobject_class->set_property = gst_example_set_property;
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gobject_class->set_property = gst_example_set_property;
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gobject_class->get_property = gst_example_get_property;
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gobject_class->get_property = gst_example_get_property;
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/* we also override the default state change handler with our own
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* implementation */
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gstelement_class->change_state = gst_example_change_state;
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}
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}
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/* This function is responsible for initializing a specific instance of
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/* This function is responsible for initializing a specific instance of
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@ -327,6 +333,53 @@ gst_example_get_property (GObject *object, guint prop_id, GValue *value, GParamS
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}
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}
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}
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}
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/* This is the state change function that will be called when
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* the element goes through the different state changes.
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* The plugin can prepare itself and its internal data structures
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* in the various state transitions.
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*/
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static GstElementStateReturn
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gst_example_change_state (GstElement *element)
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{
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GstExample *example;
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/* cast to our plugin */
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example = GST_EXAMPLE(element);
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/* we perform our actions based on the state transition
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* of the element */
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switch (GST_STATE_TRANSITION (element)) {
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/* The NULL to READY transition is used to
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* create threads (if any) */
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case GST_STATE_NULL_TO_READY:
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break;
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/* In the READY to PAUSED state, the element should
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* open devices (if any) */
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case GST_STATE_READY_TO_PAUSED:
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break;
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/* In the PAUSED to PLAYING state, the element should
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* prepare itself for operation or continue after a PAUSE */
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case GST_STATE_PAUSED_TO_PLAYING:
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break;
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/* In the PLAYING to PAUSED state, the element should
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* PAUSE itself and make sure it can resume operation */
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case GST_STATE_PLAYING_TO_PAUSED:
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break;
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/* In the PAUSED to READY state, the element should reset
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* its internal state and close any devices. */
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case GST_STATE_PAUSED_TO_READY:
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break;
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/* The element should free all resources, terminate threads
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* and put itself into its initial state again */
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case GST_STATE_READY_TO_NULL:
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break;
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}
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/* Then we call the parent state change handler */
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return parent_class->change_state (element);
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}
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/* This is the entry into the plugin itself. When the plugin loads,
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/* This is the entry into the plugin itself. When the plugin loads,
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* this function is called to register everything that the plugin provides.
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* this function is called to register everything that the plugin provides.
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*/
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*/
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@ -97,6 +97,8 @@ static void gst_example_set_property (GObject *object, guint prop_id,
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const GValue *value, GParamSpec *pspec);
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const GValue *value, GParamSpec *pspec);
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static void gst_example_get_property (GObject *object, guint prop_id,
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static void gst_example_get_property (GObject *object, guint prop_id,
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GValue *value, GParamSpec *pspec);
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GValue *value, GParamSpec *pspec);
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static GstElementStateReturn
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gst_example_change_state (GstElement *element);
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/* The parent class pointer needs to be kept around for some object
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/* The parent class pointer needs to be kept around for some object
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* operations.
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* operations.
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@ -179,6 +181,10 @@ gst_example_class_init (GstExampleClass *klass)
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*/
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*/
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gobject_class->set_property = gst_example_set_property;
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gobject_class->set_property = gst_example_set_property;
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gobject_class->get_property = gst_example_get_property;
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gobject_class->get_property = gst_example_get_property;
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/* we also override the default state change handler with our own
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* implementation */
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gstelement_class->change_state = gst_example_change_state;
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}
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}
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/* This function is responsible for initializing a specific instance of
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/* This function is responsible for initializing a specific instance of
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@ -327,6 +333,53 @@ gst_example_get_property (GObject *object, guint prop_id, GValue *value, GParamS
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}
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}
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}
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}
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/* This is the state change function that will be called when
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* the element goes through the different state changes.
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* The plugin can prepare itself and its internal data structures
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* in the various state transitions.
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*/
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static GstElementStateReturn
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gst_example_change_state (GstElement *element)
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{
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GstExample *example;
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/* cast to our plugin */
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example = GST_EXAMPLE(element);
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/* we perform our actions based on the state transition
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* of the element */
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switch (GST_STATE_TRANSITION (element)) {
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/* The NULL to READY transition is used to
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* create threads (if any) */
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case GST_STATE_NULL_TO_READY:
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break;
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/* In the READY to PAUSED state, the element should
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* open devices (if any) */
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case GST_STATE_READY_TO_PAUSED:
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break;
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/* In the PAUSED to PLAYING state, the element should
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* prepare itself for operation or continue after a PAUSE */
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case GST_STATE_PAUSED_TO_PLAYING:
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break;
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/* In the PLAYING to PAUSED state, the element should
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* PAUSE itself and make sure it can resume operation */
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case GST_STATE_PLAYING_TO_PAUSED:
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break;
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/* In the PAUSED to READY state, the element should reset
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* its internal state and close any devices. */
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case GST_STATE_PAUSED_TO_READY:
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break;
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/* The element should free all resources, terminate threads
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* and put itself into its initial state again */
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case GST_STATE_READY_TO_NULL:
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break;
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}
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/* Then we call the parent state change handler */
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return parent_class->change_state (element);
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}
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/* This is the entry into the plugin itself. When the plugin loads,
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/* This is the entry into the plugin itself. When the plugin loads,
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* this function is called to register everything that the plugin provides.
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* this function is called to register everything that the plugin provides.
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*/
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*/
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