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decklink: Re-add the COM initialization code for Windows

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Untested, and we will never deinitialize COM again.
This commit is contained in:
Sebastian Dröge 2014-12-19 14:50:09 +01:00
parent f9d16c5913
commit 5e7782ca39
1 changed files with 64 additions and 0 deletions
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64
sys/decklink/gstdecklink.cpp
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@ -328,6 +328,57 @@ public:
}
};
#ifdef _MSC_VER
/* FIXME: We currently never deinit this */
static GMutex com_init_lock;
static GMutex com_deinit_lock;
static GCond com_init_cond;
static GCond com_deinit_cond;
static GCond com_deinited_cond;
static gboolean com_initialized = FALSE;
/* COM initialization/uninitialization thread */
static gpointer
gst_decklink_com_thread (gpointer data)
{
HRESULT res;
g_mutex_lock (&com_init_lock);
/* Initialize COM with a MTA for this process. This thread will
* be the first one to enter the apartement and the last one to leave
* it, unitializing COM properly */
res = CoInitializeEx (0, COINIT_MULTITHREADED);
if (res == S_FALSE)
GST_WARNING ("COM has been already initialized in the same process");
else if (res == RPC_E_CHANGED_MODE)
GST_WARNING ("The concurrency model of COM has changed.");
else
GST_INFO ("COM intialized succesfully");
com_initialized = TRUE;
/* Signal other threads waiting on this condition that COM was initialized */
g_cond_signal (&com_init_cond);
g_mutex_unlock (&com_init_lock);
/* Wait until the unitialize condition is met to leave the COM apartement */
g_mutex_lock (&com_deinit_lock);
g_cond_wait (&com_deinit_cond, &com_deinit_lock);
CoUninitialize ();
GST_INFO ("COM unintialized succesfully");
com_initialized = FALSE;
g_cond_signal (&com_deinited_cond);
g_mutex_unlock (&com_deinit_lock);
return NULL;
}
#endif /* _MSC_VER */
static GOnce devices_once = G_ONCE_INIT;
static int n_devices;
static Device devices[10];
@ -340,6 +391,19 @@ init_devices (gpointer data)
HRESULT ret;
int i;
#ifdef _MSC_VER
// Start COM thread for Windows
g_mutex_lock (&com_init_lock);
/* create the COM initialization thread */
g_thread_create ((GThreadFunc) gst_decklink_com_thread, NULL, FALSE, NULL);
/* wait until the COM thread signals that COM has been initialized */
g_cond_wait (&com_init_cond, &com_init_lock);
g_mutex_unlock (&com_init_lock);
#endif /* _MSC_VER */
iterator = CreateDeckLinkIteratorInstance ();
if (iterator == NULL) {
GST_ERROR ("no driver");