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matrox: fix reopening of a camera in same process lifetime

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Matrox only wants one application object created per process
This commit is contained in:
Joshua M. Doe 2020-07-10 14:28:05 -04:00
parent 5a4b2ce38c
commit dd0a7bf93e
1 changed files with 34 additions and 8 deletions
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42
sys/matrox/gstmatroxsrc.c
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@ -138,6 +138,35 @@ static GstStaticPadTemplate gst_matroxsrc_src_template =
G_DEFINE_TYPE (GstMatroxSrc, gst_matroxsrc, GST_TYPE_PUSH_SRC);
static MIL_ID g_milapp = M_NULL;
static int g_milapp_use_count = 0;
/* Matrox only wants an Application object to be created once per process,
* and it must be freed in the same thread it was created in */
static MIL_ID
gst_matroxsrc_milapp_get ()
{
if (g_once_init_enter (&g_milapp)) {
MIL_ID setup_value = M_NULL;
g_assert (g_milapp_use_count == 0);
MappAlloc (M_NULL, M_DEFAULT, &setup_value);
g_once_init_leave (&g_milapp, setup_value);
}
g_milapp_use_count += 1;
return g_milapp;
}
static void
gst_matroxsrc_milapp_unref ()
{
g_milapp_use_count--;
if (g_milapp_use_count == 0) {
MappFree (g_milapp);
g_milapp = M_NULL;
}
}
static void
gst_matroxsrc_class_init (GstMatroxSrcClass * klass)
{
@ -244,11 +273,6 @@ gst_matroxsrc_reset (GstMatroxSrc * src)
MsysFree (src->MilSystem);
src->MilSystem = M_NULL;
}
if (src->MilApplication) {
MappFree (src->MilApplication);
src->MilApplication = M_NULL;
}
}
static void
@ -281,6 +305,8 @@ gst_matroxsrc_init (GstMatroxSrc * src)
src->MilGrabBufferList = NULL;
gst_matroxsrc_reset (src);
src->MilApplication = gst_matroxsrc_milapp_get ();
}
void
@ -394,6 +420,8 @@ gst_matroxsrc_finalize (GObject * object)
gst_matroxsrc_reset (src);
gst_matroxsrc_milapp_unref ();
G_OBJECT_CLASS (gst_matroxsrc_parent_class)->finalize (object);
}
@ -415,9 +443,7 @@ gst_matroxsrc_start (GstBaseSrc * bsrc)
GST_DEBUG_OBJECT (src, "start");
/* create App */
ret = MappAlloc (M_NULL, M_DEFAULT, &src->MilApplication);
if (ret == M_NULL) {
if (src->MilApplication == M_NULL) {
GST_ELEMENT_ERROR (src, RESOURCE, FAILED,
("Failed to allocate a MIL application"), (NULL));
return FALSE;