pipewire: Fix GST hang for unavailable cameras

- GST pipeline or camera-gstreamer app hangs for a unavailable target.

- To fix the issue gstpipewiresrc element in pipewire is enhanced to
  handle the pw_stream error in a better manner.

Bug-AGL: SPEC-4881
Change-Id: Id67095b1ecf5e59d00f9c79e15c7464f27a43eb4
Signed-off-by: Ashok Sidipotu <ashok.sidipotu@collabora.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29397
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Marius Vlad <marius.vlad@collabora.com>

3 files changed, 102 insertions, 0 deletions

diff --git a/meta-pipewire/recipes-multimedia/pipewire/pipewire/0002-gst-avoid-reporting-error-twice.patch b/meta-pipewire/recipes-multimedia/pipewire/pipewire/0002-gst-avoid-reporting-error-twice.patch
new file mode 100644
index 000000000..fa123a07f
--- /dev/null
+++ b/meta-pipewire/recipes-multimedia/pipewire/pipewire/0002-gst-avoid-reporting-error-twice.patch
@@ -0,0 +1,62 @@
+From cbb12450c2f258ef3ac8239889784e1a97dfeaa8 Mon Sep 17 00:00:00 2001
+From: George Kiagiadakis <george.kiagiadakis@collabora.com>
+Date: Wed, 8 Nov 2023 18:12:59 +0200
+Subject: [PATCH 1/2] gst: avoid reporting error twice
+
+First, make the error permanent by calling pw_stream_set_error()
+and when this emits an error state again, report that to GStreamer.
+
+Do the same in pipewiresink, which didn't even have the
+pw_stream_set_error() call before, so the stream wasn't really going
+into an error state at all.
+
+Upstream-Status: Pipewire MR1763 merged
+---
+ src/gst/gstpipewiresink.c |  9 +++++++--
+ src/gst/gstpipewiresrc.c  | 10 +++++++---
+ 2 files changed, 14 insertions(+), 5 deletions(-)
+
+diff --git a/src/gst/gstpipewiresink.c b/src/gst/gstpipewiresink.c
+index 36d158095..001ede9d5 100644
+--- a/src/gst/gstpipewiresink.c
++++ b/src/gst/gstpipewiresink.c
+@@ -532,8 +532,13 @@ on_state_changed (void *data, enum pw_stream_state old, enum pw_stream_state sta
+         pw_stream_trigger_process (pwsink->stream);
+       break;
+     case PW_STREAM_STATE_ERROR:
+-      GST_ELEMENT_ERROR (pwsink, RESOURCE, FAILED,
+-          ("stream error: %s", error), (NULL));
++      /* make the error permanent, if it is not already;
++         pw_stream_set_error() will recursively call us again */
++      if (pw_stream_get_state (pwsink->stream, NULL) != PW_STREAM_STATE_ERROR)
++        pw_stream_set_error (pwsink->stream, -EPIPE, "%s", error);
++      else
++        GST_ELEMENT_ERROR (pwsink, RESOURCE, FAILED,
++            ("stream error: %s", error), (NULL));
+       break;
+   }
+   pw_thread_loop_signal (pwsink->core->loop, FALSE);
+diff --git a/src/gst/gstpipewiresrc.c b/src/gst/gstpipewiresrc.c
+index 0514e4caa..e473338ba 100644
+--- a/src/gst/gstpipewiresrc.c
++++ b/src/gst/gstpipewiresrc.c
+@@ -681,9 +681,13 @@ on_state_changed (void *data,
+     case PW_STREAM_STATE_STREAMING:
+       break;
+     case PW_STREAM_STATE_ERROR:
+-      pw_stream_set_error (pwsrc->stream, -EPIPE, "%s", error);
+-      GST_ELEMENT_ERROR (pwsrc, RESOURCE, FAILED,
+-          ("stream error: %s", error), (NULL));
++      /* make the error permanent, if it is not already;
++         pw_stream_set_error() will recursively call us again */
++      if (pw_stream_get_state (pwsrc->stream, NULL) != PW_STREAM_STATE_ERROR)
++        pw_stream_set_error (pwsrc->stream, -EPIPE, "%s", error);
++      else
++        GST_ELEMENT_ERROR (pwsrc, RESOURCE, FAILED,
++            ("stream error: %s", error), (NULL));
+       break;
+   }
+   pw_thread_loop_signal (pwsrc->core->loop, FALSE);
+--
+2.41.0
+
diff --git a/meta-pipewire/recipes-multimedia/pipewire/pipewire/0003-gstpipewiresrc-break-out-of-wait_started-also-on-STA.patch b/meta-pipewire/recipes-multimedia/pipewire/pipewire/0003-gstpipewiresrc-break-out-of-wait_started-also-on-STA.patch
new file mode 100644
index 000000000..29bc50472
--- /dev/null
+++ b/meta-pipewire/recipes-multimedia/pipewire/pipewire/0003-gstpipewiresrc-break-out-of-wait_started-also-on-STA.patch
@@ -0,0 +1,38 @@
+From 4fb8417b201033ae2de20032b44d52cae1394ff8 Mon Sep 17 00:00:00 2001
+From: George Kiagiadakis <george.kiagiadakis@collabora.com>
+Date: Wed, 8 Nov 2023 18:23:02 +0200
+Subject: [PATCH 2/2] gstpipewiresrc: break out of wait_started() also on
+ STATE_UNCONNECTED
+
+When the session manager sends an error to the client, it typically
+also destroys the node after the error, which causes the stream to go
+to STATE_UNCONNECTED via proxy_removed(). In that case, make sure
+we exit the loop early, otherwise it will take 30 seconds to unblock
+gst_element_set_state()
+
+Upstream-Status: Pipewire MR1763 merged
+---
+ src/gst/gstpipewiresrc.c | 7 +++----
+ 1 file changed, 3 insertions(+), 4 deletions(-)
+
+diff --git a/src/gst/gstpipewiresrc.c b/src/gst/gstpipewiresrc.c
+index e473338ba..e3b86b373 100644
+--- a/src/gst/gstpipewiresrc.c
++++ b/src/gst/gstpipewiresrc.c
+@@ -783,10 +783,9 @@ wait_started (GstPipeWireSrc *this)
+     GST_DEBUG_OBJECT (this, "waiting for started signal, state now %s",
+         pw_stream_state_as_string (state));
+
+-    if (state == PW_STREAM_STATE_ERROR)
+-      break;
+-
+-    if (this->flushing) {
++    if (state == PW_STREAM_STATE_ERROR ||
++        state == PW_STREAM_STATE_UNCONNECTED ||
++        this->flushing) {
+       state = PW_STREAM_STATE_ERROR;
+       break;
+     }
+--
+2.41.0
+
diff --git a/meta-pipewire/recipes-multimedia/pipewire/pipewire_0.3.83.bbappend b/meta-pipewire/recipes-multimedia/pipewire/pipewire_0.3.83.bbappend
index beb7c0817..6b920abd3 100644
--- a/meta-pipewire/recipes-multimedia/pipewire/pipewire_0.3.83.bbappend
+++ b/meta-pipewire/recipes-multimedia/pipewire/pipewire_0.3.83.bbappend
@@ -1,5 +1,7 @@
 SRC_URI += "\
     file://0001-systemd-Do-not-override-rootprefix.patch \
+    file://0002-gst-avoid-reporting-error-twice.patch \
+    file://0003-gstpipewiresrc-break-out-of-wait_started-also-on-STA.patch \
 "
 
 PACKAGECONFIG = "\