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GstBus SubSystem
GstBus: Message+Clock
| GstObject | GstBus | |
| 成员函数 |
override Gobject的一些：
gobject_class->set_property = gst_object_set_property;
gobject_class->dispatch_properties_changed
gobject_class->dispose = gst_object_dispose;
|
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 等 |
| 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; |
override 父类的Methods:
klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_message_copy; |
| Quark data | - | - |
| GstMiniObject | GstMessage | |
| 成员函数 |
mo_class->copy = gst_mini_object_copy_default; |
override 父类的Methods:
klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_message_copy; |
| 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;
2023年4月23日 19:27
crediblebh