Sets our main struct and passes it to the parent class.
Allocate a new #GstSegment structure and initialize it using gst_segment_init().
Clip the given @start and @stop values to the segment boundaries given in @segment. @start and @stop are compared and clipped to @segment start and stop values.
Create a copy of given @segment.
Copy the contents of @src into @dest.
Update the segment structure with the field values of a seek event (see gst_event_new_seek()).
Free the allocated segment @segment.
Get the main Gtk struct
the main Gtk struct as a void*
The start/position fields are set to 0 and the stop/duration fields are set to -1 (unknown). The default rate of 1.0 and no flags are set.
Adjust the values in @segment so that @offset is applied to all future running-time calculations.
Adjust the start/stop and base values of @segment such that the next valid buffer will be one with @running_time.
Convert @running_time into a position in the segment so that gst_segment_to_running_time() with that position returns @running_time.
Translate @position to the total running time using the currently configured segment. Position is a value between @segment start and stop time.
Translate @position to stream time using the currently configured segment. The @position value must be between @segment start and stop value.
the main Gtk struct
This helper structure holds the relevant values for tracking the region of interest in a media file, called a segment.
The structure can be used for two purposes: <itemizedlist> <listitem><para>performing seeks (handling seek events)</para></listitem> <listitem><para>tracking playback regions (handling newsegment events)</para></listitem> </itemizedlist>
The segment is usually configured by the application with a seek event which is propagated upstream and eventually handled by an element that performs the seek.
The configured segment is then propagated back downstream with a newsegment event. This information is then used to clip media to the segment boundaries.
A segment structure is initialized with gst_segment_init(), which takes a #GstFormat that will be used as the format of the segment values. The segment will be configured with a start value of 0 and a stop/duration of -1, which is undefined. The default rate and applied_rate is 1.0.
The public duration field contains the duration of the segment. When using the segment for seeking, the start and time members should normally be left to their default 0 value. The stop position is left to -1 unless explicitly configured to a different value after a seek event.
The current position in the segment should be set by changing the position member in the structure.
For elements that perform seeks, the current segment should be updated with the gst_segment_do_seek() and the values from the seek event. This method will update all the segment fields. The position field will contain the new playback position. If the start_type was different from GST_SEEK_TYPE_NONE, playback continues from the position position, possibly with updated flags or rate.
For elements that want to use #GstSegment to track the playback region, update the segment fields with the information from the newsegment event. The gst_segment_clip() method can be used to check and clip the media data to the segment boundaries.
For elements that want to synchronize to the pipeline clock, gst_segment_to_running_time() can be used to convert a timestamp to a value that can be used to synchronize to the clock. This function takes into account the base as well as any rate or applied_rate conversions.
For elements that need to perform operations on media data in stream_time, gst_segment_to_stream_time() can be used to convert a timestamp and the segment info to stream time (which is always between 0 and the duration of the stream).