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implement GetStateWithTimeout

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This commit is contained in:
RSWilli
2023-09-15 14:12:16 +02:00
parent 368471c810
commit c4a6263e96
1 changed files with 32 additions and 13 deletions
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45
gst/gst_element.go
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@@ -129,20 +129,18 @@ func (e *Element) AddPad(pad *Pad) bool {
return gobool(C.gst_element_add_pad(e.Instance(), pad.Instance()))
}
// BlockSetState is like SetState except it will block until the transition
// is complete.
// BlockSetState is a convinience wrapper function for calling SetState and an infinitely blocking GetState
func (e *Element) BlockSetState(state State) error {
if err := e.SetState(state); err != nil {
return err
}
cState := C.GstState(state)
var curState C.GstState
C.gst_element_get_state(
(*C.GstElement)(e.Instance()),
(*C.GstState)(unsafe.Pointer(&curState)),
(*C.GstState)(unsafe.Pointer(&cState)),
C.GstClockTime(ClockTimeNone),
)
status, _ := e.GetState(state, ClockTimeNone)
if status != StateChangeSuccess {
return fmt.Errorf("failed to change state to %s (got %s)", state, status)
}
return nil
}
@@ -335,9 +333,30 @@ func (e *Element) GetPadTemplates() []*PadTemplate {
return out
}
// GetState returns the current state of this element.
func (e *Element) GetState() State {
return State(e.Instance().current_state)
// Gets the state of the element.
//
// For elements that performed an ASYNC state change, as reported by gst_element_set_state, this function will block up
// to the specified timeout value for the state change to complete. If the element completes the state change or goes into
// an error, this function returns immediately with a return value of GST_STATE_CHANGE_SUCCESS or GST_STATE_CHANGE_FAILURE respectively.
//
// For elements that did not return GST_STATE_CHANGE_ASYNC, this function returns the current and pending state immediately.
//
// This function returns GST_STATE_CHANGE_NO_PREROLL if the element successfully changed its state but is not able to provide
// data yet. This mostly happens for live sources that only produce data in GST_STATE_PLAYING. While the state change return is
// equivalent to GST_STATE_CHANGE_SUCCESS, it is returned to the application to signal that some sink elements might not be able
// to complete their state change because an element is not producing data to complete the preroll. When setting the element to
// playing, the preroll will complete and playback will start.
func (e *Element) GetState(state State, timeout ClockTime) (StateChangeReturn, State) {
pending := C.GstState(state)
var curState C.GstState
stateChangeStatus := C.gst_element_get_state(
(*C.GstElement)(e.Instance()),
(*C.GstState)(unsafe.Pointer(&curState)),
(*C.GstState)(unsafe.Pointer(&pending)),
C.GstClockTime(timeout),
)
return StateChangeReturn(stateChangeStatus), State(curState)
}
// GetStaticPad retrieves a pad from element by name. This version only retrieves