wasapi: Remove code that sets thread priority

This is now handled directly in gstaudiosrc/sink, and we were setting
it in the wrong thread anyway. prepare() is not the same thread as
sink_write() or src_read().

sys/wasapi/gstwasapisink.c

@@ -561,9 +561,6 @@ gst_wasapi_sink_prepare (GstAudioSink * asink, GstAudioRingBufferSpec * spec)
   gst_audio_ring_buffer_set_channel_positions (GST_AUDIO_BASE_SINK
       (self)->ringbuffer, self->positions);
 
-  /* Increase the thread priority to reduce glitches */
-  self->thread_priority_handle = gst_wasapi_util_set_thread_characteristics ();
-
   res = TRUE;
 
 beach:
@@ -582,12 +579,6 @@ gst_wasapi_sink_unprepare (GstAudioSink * asink)
 
   CoUninitialize ();
 
-  if (self->thread_priority_handle != NULL) {
-    gst_wasapi_util_revert_thread_characteristics
-        (self->thread_priority_handle);
-    self->thread_priority_handle = NULL;
-  }
-
   if (self->client != NULL) {
     IAudioClient_Stop (self->client);
   }
@@ -614,7 +605,8 @@ gst_wasapi_sink_write (GstAudioSink * asink, gpointer data, guint length)
   GST_OBJECT_LOCK (self);
   if (self->client_needs_restart) {
     hr = IAudioClient_Start (self->client);
-    HR_FAILED_AND (hr, IAudioClient::Start, GST_OBJECT_UNLOCK (self); goto beach);
+    HR_FAILED_AND (hr, IAudioClient::Start, GST_OBJECT_UNLOCK (self);
+        goto beach);
     self->client_needs_restart = FALSE;
   }
   GST_OBJECT_UNLOCK (self);
@@ -636,8 +628,8 @@ gst_wasapi_sink_write (GstAudioSink * asink, gpointer data, guint length)
      * GetBuffer will error out */
     if (can_frames != have_frames) {
       GST_ERROR_OBJECT (self,
-        "Need at %i frames to write for exclusive mode, but got %i",
+          "Need at %i frames to write for exclusive mode, but got %i",
-        can_frames, have_frames);
+          can_frames, have_frames);
       written_len = -1;
       goto beach;
     }

sys/wasapi/gstwasapisink.h

@@ -44,7 +44,6 @@ struct _GstWasapiSink
   IAudioClient *client;
   IAudioRenderClient *render_client;
   HANDLE event_handle;
-  HANDLE thread_priority_handle;
   /* Client was reset, so it needs to be started again */
   gboolean client_needs_restart;
 

sys/wasapi/gstwasapisrc.c

@@ -512,9 +512,6 @@ gst_wasapi_src_prepare (GstAudioSrc * asrc, GstAudioRingBufferSpec * spec)
   gst_audio_ring_buffer_set_channel_positions (GST_AUDIO_BASE_SRC
       (self)->ringbuffer, self->positions);
 
-  /* Increase the thread priority to reduce glitches */
-  self->thread_priority_handle = gst_wasapi_util_set_thread_characteristics ();
-
   res = TRUE;
 beach:
   /* unprepare() is not called if prepare() fails, but we want it to be, so call
@@ -530,12 +527,6 @@ gst_wasapi_src_unprepare (GstAudioSrc * asrc)
 {
   GstWasapiSrc *self = GST_WASAPI_SRC (asrc);
 
-  if (self->thread_priority_handle != NULL) {
-    gst_wasapi_util_revert_thread_characteristics
-        (self->thread_priority_handle);
-    self->thread_priority_handle = NULL;
-  }
-
   if (self->client != NULL) {
     IAudioClient_Stop (self->client);
   }

sys/wasapi/gstwasapisrc.h

@@ -46,7 +46,6 @@ struct _GstWasapiSrc
   guint64 client_clock_freq;
   IAudioCaptureClient *capture_client;
   HANDLE event_handle;
-  HANDLE thread_priority_handle;
   /* Client was reset, so it needs to be started again */
   gboolean client_needs_restart;
 

sys/wasapi/gstwasapiutil.c

@@ -106,16 +106,6 @@ static struct
 
 static int windows_major_version = 0;
 
-static struct
-{
-  HMODULE dll;
-  gboolean tried_loading;
-
-    HANDLE (WINAPI * AvSetMmThreadCharacteristics) (LPCSTR, LPDWORD);
-    BOOL (WINAPI * AvRevertMmThreadCharacteristics) (HANDLE);
-} gst_wasapi_avrt_tbl = {
-0};
-
 gboolean
 gst_wasapi_util_have_audioclient3 (void)
 {
@@ -956,50 +946,3 @@ gst_wasapi_util_initialize_audioclient3 (GstElement * self,
   *ret_devicep_frames = devicep_frames;
   return TRUE;
 }
-
-static gboolean
-gst_wasapi_util_init_thread_priority (void)
-{
-  if (gst_wasapi_avrt_tbl.tried_loading)
-    return gst_wasapi_avrt_tbl.dll != NULL;
-
-  if (!gst_wasapi_avrt_tbl.dll)
-    gst_wasapi_avrt_tbl.dll = LoadLibrary (TEXT ("avrt.dll"));
-
-  if (!gst_wasapi_avrt_tbl.dll) {
-    GST_WARNING ("Failed to set thread priority, can't find avrt.dll");
-    gst_wasapi_avrt_tbl.tried_loading = TRUE;
-    return FALSE;
-  }
-
-  gst_wasapi_avrt_tbl.AvSetMmThreadCharacteristics =
-      GetProcAddress (gst_wasapi_avrt_tbl.dll, "AvSetMmThreadCharacteristicsA");
-  gst_wasapi_avrt_tbl.AvRevertMmThreadCharacteristics =
-      GetProcAddress (gst_wasapi_avrt_tbl.dll,
-      "AvRevertMmThreadCharacteristics");
-
-  gst_wasapi_avrt_tbl.tried_loading = TRUE;
-
-  return TRUE;
-}
-
-HANDLE
-gst_wasapi_util_set_thread_characteristics (void)
-{
-  DWORD taskIndex = 0;
-
-  if (!gst_wasapi_util_init_thread_priority ())
-    return NULL;
-
-  return gst_wasapi_avrt_tbl.AvSetMmThreadCharacteristics (TEXT ("Pro Audio"),
-      &taskIndex);
-}
-
-void
-gst_wasapi_util_revert_thread_characteristics (HANDLE handle)
-{
-  if (!gst_wasapi_util_init_thread_priority ())
-    return;
-
-  gst_wasapi_avrt_tbl.AvRevertMmThreadCharacteristics (handle);
-}

sys/wasapi/gstwasapiutil.h

@@ -114,8 +114,4 @@ gboolean gst_wasapi_util_initialize_audioclient3 (GstElement * element,
     WAVEFORMATEX * format, gboolean low_latency, gboolean loopback,
     guint * ret_devicep_frames);
 
-HANDLE gst_wasapi_util_set_thread_characteristics (void);
-
-void gst_wasapi_util_revert_thread_characteristics (HANDLE handle);
-
 #endif /* __GST_WASAPI_UTIL_H__ */