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gst: sink: Manage buffer pool memory manually

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Let's make sure we own the memory in buffers, so that we can be
resilient to the PW link going away. This currently maintains the status
quo of copying data into the pipewirepool for sending to the remote end,
but moves the allocation of buffers so that ownership is maintained by
the sink in all cases.

There are some tricky corners, especially with bufferpool vs. buffers
param negotiation -- bufferpool parameters can be negotiated in
GStreamer before the link even comes up, so we try to adapt the buffers
param to use the negotiated value. For now, that is more brittle than
tying those two aspects together. We can revisit this if we can find a
way to tie pipeline state and link state more closely.

Co-authored-by: Arun Raghavan <arun@asymptotic.io>
This commit is contained in:
Taruntej Kanakamalla 2025-03-20 21:13:03 -04:00 • committed by Wim Taymans
parent 1b258f4ecc
commit ee2c6eb41e
4 changed files with 151 additions and 37 deletions
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5
meson.build
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@ -410,6 +410,7 @@ gst_deps_def = {
gst_dep = []
gst_dma_drm_found = false
gst_shm_allocator_found = false
foreach depname, kwargs: gst_deps_def
dep = dependency(depname, required: gst_option, kwargs: kwargs)
summary({depname: dep.found()}, bool_yn: true, section: 'GStreamer modules')
@ -425,9 +426,13 @@ foreach depname, kwargs: gst_deps_def
if depname == 'gstreamer-allocators-1.0' and dep.version().version_compare('>= 1.23.1')
gst_dma_drm_found = true
gst_shm_allocator_found = true
endif
endforeach
summary({'gstreamer SHM allocator': gst_shm_allocator_found}, bool_yn: true, section: 'Backend')
cdata.set('HAVE_GSTREAMER_SHM_ALLOCATOR', gst_shm_allocator_found)
# This code relies on the array being empty if any dependency was not found
gst_dp_found = gst_dep.length() > 0
summary({'gstreamer-device-provider': gst_dp_found}, bool_yn: true, section: 'Backend')