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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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419 lines
6.7 KiB
Text
419 lines
6.7 KiB
Text
<!-- ##### SECTION Title ##### -->
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GstClock
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<!-- ##### SECTION Short_Description ##### -->
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Abstract class for global clocks
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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GStreamer uses a global clock to synchronise the plugins in a pipeline.
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Different clock implementations are possible by implementing this abstract
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base class.
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</para>
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<para>
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The clock time is always measured in nanoseconds, with the clock being set
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to 0 when the pipeline goes to READY. Usually all renderers sync to the global
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clock so that the clock is always a good measure of the time in the pipeline.
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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#GstSystemClock
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</para>
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<!-- ##### TYPEDEF GstClockTime ##### -->
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<para>
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A datatype to hold a time, measured in nanoseconds.
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</para>
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<!-- ##### TYPEDEF GstClockTimeDiff ##### -->
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<para>
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A datatype to hold a timedifference, measured in nanoseconds.
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</para>
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<!-- ##### TYPEDEF GstClockID ##### -->
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<para>
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A detatype to hold the handle to an outstanding async clock callback
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</para>
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<!-- ##### MACRO GST_CLOCK_TIME_NONE ##### -->
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<para>
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Constant to define an undefined clock time
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</para>
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<!-- ##### MACRO GST_SECOND ##### -->
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<para>
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Constant that defines one GStreamer second
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</para>
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<!-- ##### MACRO GST_MSECOND ##### -->
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<para>
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Constant that defines one GStreamer millisecond
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</para>
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<!-- ##### MACRO GST_USECOND ##### -->
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<para>
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Constant that defines one GStreamer microsecond
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</para>
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<!-- ##### MACRO GST_NSECOND ##### -->
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<para>
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Constant that defines one GStreamer nanosecond
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</para>
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<!-- ##### MACRO GST_CLOCK_DIFF ##### -->
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<para>
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Calculate a difference between to clock times.
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</para>
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@s: the first time
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@e: the second time
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<!-- ##### MACRO GST_TIMEVAL_TO_TIME ##### -->
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<para>
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Convert a GTimeVal to a GstClockTime
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</para>
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@tv: the timeval to convert
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<!-- ##### MACRO GST_TIME_TO_TIMEVAL ##### -->
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<para>
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Convert a GstClockTime to a GTimeVal
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</para>
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@t: The GstClockTime to convert
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@tv: The target timeval
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<!-- ##### STRUCT GstClockEntry ##### -->
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<para>
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All pending timeouts or periodic notifies are converted into
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an entry.
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</para>
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@clock:
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@type:
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@time:
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@interval:
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@status:
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@func:
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@user_data:
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<!-- ##### USER_FUNCTION GstClockCallback ##### -->
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<para>
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The function prototype of the callback.
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</para>
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@clock: The clock that triggered the callback
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@time: The time it was triggered
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@id: The id that expired
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@user_data: user data passed in the async_wait call
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@Returns:
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<!-- ##### ENUM GstClockEntryStatus ##### -->
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<para>
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The status of a clock timeout.
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</para>
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@GST_CLOCK_ENTRY_OK: timeout happened
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@GST_CLOCK_ENTRY_EARLY: request for timout that has been passed
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@GST_CLOCK_ENTRY_RESTART: need to restart the timeout request
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<!-- ##### ENUM GstClockEntryType ##### -->
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<para>
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The type of the clock entry
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</para>
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@GST_CLOCK_ENTRY_SINGLE: a single shot timeout
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@GST_CLOCK_ENTRY_PERIODIC: a periodic timeout request
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<!-- ##### MACRO GST_CLOCK_ENTRY_TRACE_NAME ##### -->
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<para>
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The name used for tracing clock entry allocations.
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</para>
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<!-- ##### MACRO GST_CLOCK_ENTRY ##### -->
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<para>
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Cast to a clock entry
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</para>
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@entry: the entry to cast
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<!-- ##### MACRO GST_CLOCK_ENTRY_CLOCK ##### -->
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<para>
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Get the owner clock of the entry
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</para>
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@entry: the entry to query
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<!-- ##### MACRO GST_CLOCK_ENTRY_TYPE ##### -->
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<para>
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Get the type of the clock entry
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</para>
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@entry: the entry to query
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<!-- ##### MACRO GST_CLOCK_ENTRY_TIME ##### -->
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<para>
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Get the requested time of this entry
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</para>
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@entry: the entry to query
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<!-- ##### MACRO GST_CLOCK_ENTRY_INTERVAL ##### -->
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<para>
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Get the interval of this periodic entry
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</para>
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@entry: the entry to query
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<!-- ##### MACRO GST_CLOCK_ENTRY_STATUS ##### -->
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<para>
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The status of the entry
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</para>
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@entry: the entry to query
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<!-- ##### ENUM GstClockReturn ##### -->
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<para>
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The return value of a clock operation.
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</para>
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@GST_CLOCK_STOPPED: The clock is stopped.
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@GST_CLOCK_TIMEOUT: The operation timed out.
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@GST_CLOCK_EARLY: The operation was scheduled too late.
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@GST_CLOCK_ERROR: An error occured
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@GST_CLOCK_UNSUPPORTED: Operation is not supported
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<!-- ##### ENUM GstClockFlags ##### -->
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<para>
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The capabilities of this clock
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</para>
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@GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC: This clock can do a single sync timeut request
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@GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC: This clock can do a single async timeout request
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@GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC: This clock can do sync periodic timeout requests
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@GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC: This clock can do async periodic timeout callbacks
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@GST_CLOCK_FLAG_CAN_SET_RESOLUTION: The resolution of this clock can be changed
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@GST_CLOCK_FLAG_CAN_SET_SPEED: The speed of this clock can be changed
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<!-- ##### MACRO GST_CLOCK_FLAGS ##### -->
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<para>
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Get the clock flags
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</para>
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@clock: the clock to query
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<!-- ##### STRUCT GstClock ##### -->
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<para>
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</para>
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<!-- ##### FUNCTION gst_clock_set_speed ##### -->
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<para>
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</para>
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@clock:
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@speed:
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@Returns:
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<!-- ##### FUNCTION gst_clock_get_speed ##### -->
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<para>
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</para>
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@clock:
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@Returns:
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<!-- ##### FUNCTION gst_clock_set_resolution ##### -->
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<para>
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</para>
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@clock:
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@resolution:
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@Returns:
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<!-- ##### FUNCTION gst_clock_get_resolution ##### -->
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<para>
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</para>
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@clock:
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@Returns:
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<!-- ##### FUNCTION gst_clock_set_active ##### -->
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<para>
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</para>
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@clock:
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@active:
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<!-- ##### FUNCTION gst_clock_is_active ##### -->
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<para>
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</para>
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@clock:
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@Returns:
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<!-- ##### FUNCTION gst_clock_reset ##### -->
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<para>
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</para>
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@clock:
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<!-- ##### FUNCTION gst_clock_handle_discont ##### -->
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<para>
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</para>
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@clock:
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@time:
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@Returns:
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<!-- ##### FUNCTION gst_clock_get_time ##### -->
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<para>
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</para>
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@clock:
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@Returns:
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<!-- ##### FUNCTION gst_clock_get_next_id ##### -->
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<para>
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</para>
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@clock:
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@Returns:
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<!-- ##### FUNCTION gst_clock_new_single_shot_id ##### -->
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<para>
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</para>
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@clock:
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@time:
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@Returns:
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<!-- ##### FUNCTION gst_clock_new_periodic_id ##### -->
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<para>
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</para>
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@clock:
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@start_time:
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@interval:
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@Returns:
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<!-- ##### FUNCTION gst_clock_id_get_time ##### -->
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<para>
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</para>
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@id:
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@Returns:
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<!-- ##### FUNCTION gst_clock_id_wait ##### -->
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<para>
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</para>
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@id:
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@jitter:
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@Returns:
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<!-- ##### FUNCTION gst_clock_id_wait_async ##### -->
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<para>
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</para>
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@id:
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@func:
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@user_data:
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@Returns:
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<!-- ##### FUNCTION gst_clock_id_unschedule ##### -->
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<para>
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</para>
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@id:
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<!-- ##### FUNCTION gst_clock_id_unlock ##### -->
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<para>
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</para>
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@id:
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<!-- ##### FUNCTION gst_clock_id_free ##### -->
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<para>
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</para>
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@id:
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<!-- ##### ARG GstClock:event-diff ##### -->
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<para>
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</para>
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<!-- ##### ARG GstClock:max-diff ##### -->
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<para>
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Maximum allowed diff for clock sync requests against the real time.
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</para>
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<!-- ##### ARG GstClock:stats ##### -->
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<para>
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Boolean property to activate stat generation on the clock.
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</para>
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