GstTypes
GstTypes — various global enums and constants
Details
enum GstElementState
typedef enum {
GST_STATE_VOID_PENDING = 0,
GST_STATE_NULL = (1 << 0),
GST_STATE_READY = (1 << 1),
GST_STATE_PAUSED = (1 << 2),
GST_STATE_PLAYING = (1 << 3)
} GstElementState;
These contants describe the state a GstElement is in and transition scheduled for the GstElement (the pending state).
GST_STATE_VOID_PENDING | no transition is schedules for this element
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GST_STATE_NULL | this is the default state all elements are in, after they have been created and are doing nothing
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GST_STATE_READY | the element is ready to start doing something
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GST_STATE_PAUSED | the element is paused for a period of time
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GST_STATE_PLAYING | the element is doing something
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enum GstElementStateReturn
typedef enum {
GST_STATE_FAILURE = 0,
GST_STATE_SUCCESS = 1,
GST_STATE_ASYNC = 2
} GstElementStateReturn;
One of these values is returned from a gst_element_set_state() call.
As GST_STATE_FAILURE is equal to 0, one can use a boolean comparission
against the GstElementStateReturn value.
GST_STATE_FAILURE | the state of the element could not be changed
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GST_STATE_SUCCESS | the state of the element has already be changed
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GST_STATE_ASYNC | the state of the element will change in the near future
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enum GstResult
typedef enum {
GST_RESULT_OK,
GST_RESULT_NOK,
GST_RESULT_NOT_IMPL
} GstResult;
enum GstRank
typedef enum {
GST_RANK_NONE = 0,
GST_RANK_MARGINAL = 64,
GST_RANK_SECONDARY = 128,
GST_RANK_PRIMARY = 256
} GstRank;
Element priority ranks. Defines the order in which the autoplugger (or similar
rank-picking mechanisms) will choose this element over an alternative one
with the same function.
The rank is a unsigned integer ranging from 0 (GST_RANK_NONE) to 256 (GST_RANK_PRIMARY).
These constants serve as a rough guidiance for defining the rank of a GstPlugin using
gst_plugin_feature_set_rank().
GST_RANK_NONE | will be chosen last or not at all
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GST_RANK_MARGINAL | unlikly to be chosen
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GST_RANK_SECONDARY | likely to be chosen
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GST_RANK_PRIMARY | will be chosen first
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GST_PADDING
#define GST_PADDING 4
GST_PADDING_INIT
#define GST_PADDING_INIT { 0 }