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gst/src: Avoid unnecessary renegotiations during streaming

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Some clients like many camera apps, including Cheese or Snapshot,
trigger a lot of unnessecary renegotiations. While arguably that should
be solved on a Gstreamer level, we can help out by checking if the
preferred new caps are the same that are already in use and skip the
renegotiation in this case.

This allows several apps to e.g. take pictures without a slow and heavy
stream restart.

(cherry picked from commit e2e8cf7944)
This commit is contained in:
Robert Mader 2024-03-30 20:44:07 +01:00 • committed by Wim Taymans
parent b53c93000c
commit 6ce298ffde
1 changed files with 15 additions and 0 deletions
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15
src/gst/gstpipewiresrc.c
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@ -853,6 +853,21 @@ gst_pipewire_src_negotiate (GstBaseSrc * basesrc)
GST_DEBUG_OBJECT (basesrc, "have common caps: %" GST_PTR_FORMAT, possible_caps);
if (pw_stream_get_state(pwsrc->stream, NULL) == PW_STREAM_STATE_STREAMING) {
g_autoptr (GstCaps) current_caps = NULL;
g_autoptr (GstCaps) preferred_new_caps = NULL;
current_caps = gst_pad_get_current_caps (GST_BASE_SRC_PAD (pwsrc));
preferred_new_caps = gst_caps_copy_nth (possible_caps, 0);
if (gst_caps_is_equal (current_caps, preferred_new_caps)) {
GST_DEBUG_OBJECT (pwsrc,
"Stream running and new caps equal current ones. "
"Skipping renegotiation.");
goto no_nego_needed;
}
}
/* open a connection with these caps */
possible = gst_caps_to_format_all (possible_caps, SPA_PARAM_EnumFormat);