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pad: gst_pad_set_offset is only reliable on source pads

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Setting an offset on sink pads won't repush segment event which means
buffer running time won't be adjusted. Better warn about this than being
silently not working.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6464>
This commit is contained in:
Xavier Claessens 2024-03-27 13:41:38 -04:00 committed by GStreamer Marge Bot
parent e7598ed521
commit 364d0ff45d
2 changed files with 16 additions and 2 deletions
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5
girs/Gst-1.0.gir
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@ -30985,7 +30985,10 @@ of the peer sink pad, if present.</doc>
</parameters>
</method>
<method name="set_offset" c:identifier="gst_pad_set_offset">
<doc xml:space="preserve" filename="../subprojects/gstreamer/gst/gstpad.c">Set the offset that will be applied to the running time of @pad.</doc>
<doc xml:space="preserve" filename="../subprojects/gstreamer/gst/gstpad.c">Set the offset that will be applied to the running time of @pad. Upon next
buffer, every sticky events (notably segment) will be pushed again with
their running time adjusted. For that reason this is only reliable on
source pads.</doc>
<source-position filename="../subprojects/gstreamer/gst/gstpad.h"/>
<return-value transfer-ownership="none">
<type name="none" c:type="void"/>

13
subprojects/gstreamer/gst/gstpad.c
View file

@ -4014,13 +4014,24 @@ mark_event_not_received (GstPad * pad, PadEvent * ev, gpointer user_data)
* @pad: a #GstPad
* @offset: the offset
*
* Set the offset that will be applied to the running time of @pad.
* Set the offset that will be applied to the running time of @pad. Upon next
* buffer, every sticky events (notably segment) will be pushed again with
* their running time adjusted. For that reason this is only reliable on
* source pads.
*/
void
gst_pad_set_offset (GstPad * pad, gint64 offset)
{
g_return_if_fail (GST_IS_PAD (pad));
/* Setting pad offset on a sink pad does not work reliably:
* https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6464 */
if (GST_PAD_IS_SINK (pad)) {
/* Make it non fatal warning for backward compatibility. */
GST_WARNING_OBJECT (pad,
"Setting pad offset only works reliably on source pads");
}
GST_OBJECT_LOCK (pad);
/* if nothing changed, do nothing */
if (pad->offset == offset)