Re: [PATCH spice-gtk v3] gst: check pulsesrc version >= 1.14.5

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Hi,


On 1/13/19 6:31 PM, Marc-André Lureau wrote:
Hi

On Sun, Jan 13, 2019 at 1:13 PM Snir Sheriber <ssheribe@xxxxxxxxxx> wrote:

On 1/11/19 1:03 PM, marcandre.lureau@xxxxxxxxxx wrote:
From: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>

There is a racy bug in pulsesrc that we can't easily workaround:
https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/merge_requests/69

It is fixed with 1.15, and will be backported to upcoming 1.14.5.

PulseAudio may not be picked by autoaudiosrc, but looking up the
actual source or mimicking GstAutoDetect is unnecessarily complicated.

When pulsesrc < 1.14.5 is detected, let's drop its rank, so it won't be picked.

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
---
   src/spice-gstaudio.c | 28 ++++++++++++++++++++++++++++
   1 file changed, 28 insertions(+)

diff --git a/src/spice-gstaudio.c b/src/spice-gstaudio.c
index d0cfbc6..49e9ae6 100644
--- a/src/spice-gstaudio.c
+++ b/src/spice-gstaudio.c
@@ -527,7 +527,35 @@ SpiceGstaudio *spice_gstaudio_new(SpiceSession *session, GMainContext *context,
                                     const char *name)
   {
       GError *err = NULL;
+
       if (gst_init_check(NULL, NULL, &err)) {
+        GstPluginFeature *pulsesrc;
+
+        pulsesrc = gst_registry_lookup_feature(gst_registry_get(), "pulsesrc");
+        if (pulsesrc) {
+            unsigned major, minor, micro;
+            GstPlugin *plugin = gst_plugin_feature_get_plugin(pulsesrc);
+
+            if (sscanf(gst_plugin_get_version(plugin), "%u.%u.%u",
+                       &major, &minor, &micro) != 3) {
+                g_warn_if_reached();
+                gst_object_unref(plugin);
+                gst_object_unref(pulsesrc);
+                return NULL;
In that case plugin exists but version is unclear, isn't it preferable
to just setting a low rank as well?
I don't think we should touch it in that case, as we don't know about it.

Looks good to me other than that
ack, then?


Actually after given it another look and a test it seems that spice gstaudio code is highly pulse-audio plugin oriented, when pulse is disabled a lot of warnings and errors are emitted, some functions and properties are not supported too. we may want to consider fallback to native-pulse when < 1.14.5 instead of setting it to NONE rank.

(for example see "[PATCH spice-gtk] gstaudio: set object also when GstStreamVolume is not implemented" )


Snir.



thanks


Snir.

+            }
+
+            if (major < 1 ||
+                (major == 1 && minor < 14) ||
+                (major == 1 && minor == 14 && micro < 5)) {
+                g_warning("Bad pulsesrc version %s, lowering its rank",
+                          gst_plugin_get_version(plugin));
+                gst_plugin_feature_set_rank(pulsesrc, GST_RANK_NONE);
+            }
+
+            gst_object_unref(plugin);
+            gst_object_unref(pulsesrc);
+        }
+
           return g_object_new(SPICE_TYPE_GSTAUDIO,
                               "session", session,
                               "main-context", context,
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