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gstpipewiresrc: Fix re-linking

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When using PW source, one might want to dynamically link PW source to
a different source. Setting possible_caps to NULL prevents the caps
intersect from returning a successful result on format change. Do not
set possible_caps to NULL as we get that from peer caps which should
stay the same ideally for the duration of pipeline run. That allows
re-linking PW source any number of times with a pipeline like below.

gst-launch-1.0 pipewiresrc autoconnect=false ! queue ! video/x-raw,format=YUY2 ! videoconvert ! xvimagesink

The above pipeline can be made to switch between a camera source and a
screen capture source like wf-recorder.

Note that this fix only improves the status quo and won't work if the
peer caps change due to a re-negotiation.
This commit is contained in:
Sanchayan Maity 2025-03-25 16:24:48 +05:30 • committed by Arun Raghavan
parent 4ae348254e
commit 3c62d29a55
1 changed files with 2 additions and 2 deletions
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4
src/gst/gstpipewiresrc.c
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@ -990,7 +990,7 @@ gst_pipewire_src_negotiate (GstBaseSrc * basesrc)
GST_DEBUG_OBJECT (basesrc, "connect capture with path %s, target-object %s",
pwsrc->stream->path, pwsrc->stream->target_object);
pwsrc->possible_caps = possible_caps;
pwsrc->possible_caps = gst_caps_ref (possible_caps);
pwsrc->negotiated = FALSE;
enum pw_stream_flags flags;
@ -1027,7 +1027,6 @@ gst_pipewire_src_negotiate (GstBaseSrc * basesrc)
}
negotiated_caps = g_steal_pointer (&pwsrc->caps);
pwsrc->possible_caps = NULL;
pw_thread_loop_unlock (pwsrc->stream->core->loop);
if (negotiated_caps == NULL)
@ -1472,6 +1471,7 @@ gst_pipewire_src_stop (GstBaseSrc * basesrc)
pwsrc->eos = false;
gst_buffer_replace (&pwsrc->last_buffer, NULL);
gst_caps_replace(&pwsrc->caps, NULL);
gst_caps_replace(&pwsrc->possible_caps, NULL);
pwsrc->transform_value = UINT32_MAX;
pw_thread_loop_unlock (pwsrc->stream->core->loop);