GstBus SubSystem

os posted @ 2013年9月14日 10:40 in GStreamer , 1397 阅读

Gstreamer学习list.

如何查看GType节点,以及父子关系。

 

GstBus: Message+Clock

 

  GstObject GstBus
成员函数

override Gobject的一些:

gobject_class->set_property = gst_object_set_property;
gobject_class->get_property = gst_object_get_property;

gobject_class->dispatch_properties_changed
= GST_DEBUG_FUNCPTR (gst_object_dispatch_properties_changed);

gobject_class->dispose = gst_object_dispose;
gobject_class->finalize = gst_object_finalize;

 

gobject_class->dispose = gst_bus_dispose;
Property "name"  
Signals

"parent-set",it's default handler is NULL?

"parent-unset",it's default handler is NULL?

"object-saved",it's default handler is NULL?

"deep-notify",it's default handler is NULL?

"sync-message",it's default handler is NULL?

"message",it's default handler is NULL?

User register signal handler user可以自己注册上面几个信号的回调: user handler

user可以自己注册上面几个信号的回调: user handler

 

gst_bus_poll()注册了一个回调poll_func for "message"

何时emit signal?

user 调用GstObject的APIs:

gst_object_set_parent()

gst_object_unparent()

gst_object_save_thyself()

gst_bus_post

Quark data - -

 

GstMiniObject 是简化的GObject: 不提供属性;不提供signal.

下面这些都是轻量级的对象(Lightweight objects):

|
 
`GstMiniObject
 
|
 
+GstQuery
 
|
 
+GstMessage
 
|
 
+GstBuffer
 
|
 
+GstEvent
 
|
 
`GstBufferList
 
 
  GstMiniObject GstMessage
成员函数

  mo_class->copy = gst_mini_object_copy_default;
  mo_class->finalize = gst_mini_object_finalize;

override 父类的Methods:

  klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_message_copy;
  klass->mini_object_class.finalize =
      (GstMiniObjectFinalizeFunction) gst_message_finalize;

Quark data - -
 
 
  GstMiniObject GstMessage
成员函数

mo_class->copy = gst_mini_object_copy_default;
mo_class->finalize = gst_mini_object_finalize;

override 父类的Methods:

klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_message_copy;
klass->mini_object_class.finalize =
(GstMiniObjectFinalizeFunction) gst_message_finalize;

Quark data - -
 
 
typedef enum
{
  GST_MESSAGE_UNKNOWN           = 0,
  GST_MESSAGE_EOS               = (1 << 0),
  GST_MESSAGE_ERROR             = (1 << 1),
  GST_MESSAGE_WARNING           = (1 << 2),
  GST_MESSAGE_INFO              = (1 << 3),
  GST_MESSAGE_TAG               = (1 << 4),
  GST_MESSAGE_BUFFERING         = (1 << 5),
  GST_MESSAGE_STATE_CHANGED     = (1 << 6),
  GST_MESSAGE_STATE_DIRTY       = (1 << 7),
  GST_MESSAGE_STEP_DONE         = (1 << 8),
  GST_MESSAGE_CLOCK_PROVIDE     = (1 << 9),
  GST_MESSAGE_CLOCK_LOST        = (1 << 10),
  GST_MESSAGE_NEW_CLOCK         = (1 << 11),
  GST_MESSAGE_STRUCTURE_CHANGE  = (1 << 12),
  GST_MESSAGE_STREAM_STATUS     = (1 << 13),
  GST_MESSAGE_APPLICATION       = (1 << 14),
  GST_MESSAGE_ELEMENT           = (1 << 15),
  GST_MESSAGE_SEGMENT_START     = (1 << 16),
  GST_MESSAGE_SEGMENT_DONE      = (1 << 17),
  GST_MESSAGE_DURATION          = (1 << 18),
  GST_MESSAGE_LATENCY           = (1 << 19),
  GST_MESSAGE_ASYNC_START       = (1 << 20),
  GST_MESSAGE_ASYNC_DONE        = (1 << 21),
  GST_MESSAGE_REQUEST_STATE     = (1 << 22),
  GST_MESSAGE_STEP_START        = (1 << 23),
  GST_MESSAGE_QOS               = (1 << 24),
  GST_MESSAGE_PROGRESS          = (1 << 25),
  GST_MESSAGE_ANY               = ~0
} GstMessageType;
 
typedef enum {
  GST_QUERY_NONE = 0,
  GST_QUERY_POSITION,
  GST_QUERY_DURATION,
  GST_QUERY_LATENCY,
  GST_QUERY_JITTER,     /* not in draft-query, necessary? */
  GST_QUERY_RATE,
  GST_QUERY_SEEKING,
  GST_QUERY_SEGMENT,
  GST_QUERY_CONVERT,
  GST_QUERY_FORMATS,
  GST_QUERY_BUFFERING,
  GST_QUERY_CUSTOM,
  GST_QUERY_URI
} GstQueryType;

 

typedef enum {
  GST_BUFFER_FLAG_READONLY   = GST_MINI_OBJECT_FLAG_READONLY,
  GST_BUFFER_FLAG_MEDIA4     = GST_MINI_OBJECT_FLAG_RESERVED1,
  GST_BUFFER_FLAG_PREROLL    = (GST_MINI_OBJECT_FLAG_LAST << 0),
  GST_BUFFER_FLAG_DISCONT    = (GST_MINI_OBJECT_FLAG_LAST << 1),
  GST_BUFFER_FLAG_IN_CAPS    = (GST_MINI_OBJECT_FLAG_LAST << 2),
  GST_BUFFER_FLAG_GAP        = (GST_MINI_OBJECT_FLAG_LAST << 3),
  GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 4),
  GST_BUFFER_FLAG_MEDIA1     = (GST_MINI_OBJECT_FLAG_LAST << 5),
  GST_BUFFER_FLAG_MEDIA2     = (GST_MINI_OBJECT_FLAG_LAST << 6),
  GST_BUFFER_FLAG_MEDIA3     = (GST_MINI_OBJECT_FLAG_LAST << 7),
  GST_BUFFER_FLAG_LAST       = (GST_MINI_OBJECT_FLAG_LAST << 8)
} GstBufferFlag;

 

typedef enum {
  GST_EVENT_TYPE_UPSTREAM       = 1 << 0,
  GST_EVENT_TYPE_DOWNSTREAM     = 1 << 1,
  GST_EVENT_TYPE_SERIALIZED     = 1 << 2
} GstEventTypeFlags;
typedef enum {
  GST_EVENT_UNKNOWN               = GST_EVENT_MAKE_TYPE (0, 0),
  /* bidirectional events */
  GST_EVENT_FLUSH_START           = GST_EVENT_MAKE_TYPE (1, FLAG(BOTH)),
  GST_EVENT_FLUSH_STOP            = GST_EVENT_MAKE_TYPE (2, FLAG(BOTH) | FLAG(SERIALIZED)),
  /* downstream serialized events */
  GST_EVENT_EOS                   = GST_EVENT_MAKE_TYPE (5, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
  GST_EVENT_NEWSEGMENT            = GST_EVENT_MAKE_TYPE (6, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
  GST_EVENT_TAG                   = GST_EVENT_MAKE_TYPE (7, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
  GST_EVENT_BUFFERSIZE            = GST_EVENT_MAKE_TYPE (8, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
  GST_EVENT_SINK_MESSAGE          = GST_EVENT_MAKE_TYPE (9, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
  /* upstream events */
  GST_EVENT_QOS                   = GST_EVENT_MAKE_TYPE (15, FLAG(UPSTREAM)),
  GST_EVENT_SEEK                  = GST_EVENT_MAKE_TYPE (16, FLAG(UPSTREAM)),
  GST_EVENT_NAVIGATION            = GST_EVENT_MAKE_TYPE (17, FLAG(UPSTREAM)),
  GST_EVENT_LATENCY               = GST_EVENT_MAKE_TYPE (18, FLAG(UPSTREAM)),
  GST_EVENT_STEP                  = GST_EVENT_MAKE_TYPE (19, FLAG(UPSTREAM)),

  /* custom events start here */
  GST_EVENT_CUSTOM_UPSTREAM       = GST_EVENT_MAKE_TYPE (32, FLAG(UPSTREAM)),
  GST_EVENT_CUSTOM_DOWNSTREAM     = GST_EVENT_MAKE_TYPE (32, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
  GST_EVENT_CUSTOM_DOWNSTREAM_OOB = GST_EVENT_MAKE_TYPE (32, FLAG(DOWNSTREAM)),
  GST_EVENT_CUSTOM_BOTH           = GST_EVENT_MAKE_TYPE (32, FLAG(BOTH) | FLAG(SERIALIZED)),
  GST_EVENT_CUSTOM_BOTH_OOB       = GST_EVENT_MAKE_TYPE (32, FLAG(BOTH))
} GstEventType;

 

 


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