directsound: port away from old DirectX API

D3DX has been deprecated for the last 4 years and latest versions of
Windows no longer ship headers for it. This is fine as long as you're
building with Cerbero's Wine-based DirectX headers, but sucks if you
want to build against the actual Windows SDK.

We were just using it to get error strings anyway, so just use the
generic error string API.

sys/directsound/gstdirectsoundsink.c

@@ -109,6 +109,8 @@ static void gst_directsound_sink_set_device (GstDirectSoundSink * dsoundsink,
 static gboolean gst_directsound_sink_is_spdif_format (GstAudioRingBufferSpec *
     spec);
 
+static gchar *gst_hres_to_string (HRESULT hRes);
+
 static GstStaticPadTemplate directsoundsink_sink_factory =
     GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
@@ -442,10 +444,12 @@ gst_directsound_sink_open (GstAudioSink * asink)
 
   /* create and initialize a DirecSound object */
   if (FAILED (hRes = DirectSoundCreate (lpGuid, &dsoundsink->pDS, NULL))) {
+    gchar *error_text = gst_hres_to_string (hRes);
     GST_ELEMENT_ERROR (dsoundsink, RESOURCE, OPEN_READ,
         ("gst_directsound_sink_open: DirectSoundCreate: %s",
-            DXGetErrorString9 (hRes)), (NULL));
+            error_text), (NULL));
     g_free (lpGuid);
+    g_free (error_text);
     return FALSE;
   }
 
@@ -453,9 +457,11 @@ gst_directsound_sink_open (GstAudioSink * asink)
 
   if (FAILED (hRes = IDirectSound_SetCooperativeLevel (dsoundsink->pDS,
               GetDesktopWindow (), DSSCL_PRIORITY))) {
+    gchar *error_text = gst_hres_to_string (hRes);
     GST_ELEMENT_ERROR (dsoundsink, RESOURCE, OPEN_READ,
         ("gst_directsound_sink_open: IDirectSound_SetCooperativeLevel: %s",
-            DXGetErrorString9 (hRes)), (NULL));
+            error_text), (NULL));
+    g_free (error_text);
     return FALSE;
   }
 
@@ -548,9 +554,11 @@ gst_directsound_sink_prepare (GstAudioSink * asink,
   hRes = IDirectSound_CreateSoundBuffer (dsoundsink->pDS, &descSecondary,
       &dsoundsink->pDSBSecondary, NULL);
   if (FAILED (hRes)) {
+    gchar *error_text = gst_hres_to_string (hRes);
     GST_ELEMENT_ERROR (dsoundsink, RESOURCE, OPEN_READ,
         ("gst_directsound_sink_prepare: IDirectSound_CreateSoundBuffer: %s",
-            DXGetErrorString9 (hRes)), (NULL));
+            error_text), (NULL));
+    g_free (error_text);
     return FALSE;
   }
 
@@ -649,12 +657,19 @@ gst_directsound_sink_write (GstAudioSink * asink, gpointer data, guint length)
           && (dwStatus & DSBSTATUS_PLAYING))
         goto calculate_freesize;
       else {
+        gchar *err1, *err2;
+
         dsoundsink->first_buffer_after_reset = FALSE;
         GST_DSOUND_UNLOCK (dsoundsink);
+
+        err1 = gst_hres_to_string (hRes);
+        err2 = gst_hres_to_string (hRes2);
         GST_ELEMENT_ERROR (dsoundsink, RESOURCE, OPEN_WRITE,
-            ("gst_directsound_sink_write: IDirectSoundBuffer_GetStatus %s, IDirectSoundBuffer_GetCurrentPosition: %s, dwStatus: %lu",
-                DXGetErrorString9 (hRes2), DXGetErrorString9 (hRes), dwStatus),
-            (NULL));
+            ("gst_directsound_sink_write: IDirectSoundBuffer_GetStatus %s, "
+                "IDirectSoundBuffer_GetCurrentPosition: %s, dwStatus: %lu",
+                err2, err1, dwStatus), (NULL));
+        g_free (err1);
+        g_free (err2);
         return -1;
       }
     }
@@ -819,9 +834,10 @@ gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink,
   hRes = IDirectSound_CreateSoundBuffer (dsoundsink->pDS, &descSecondary,
       &tmpBuffer, NULL);
   if (FAILED (hRes)) {
+    gchar *error_text = gst_hres_to_string (hRes);
     GST_INFO_OBJECT (dsoundsink, "AC3 passthrough not supported "
-        "(IDirectSound_CreateSoundBuffer returned: %s)\n",
-        DXGetErrorString9 (hRes));
+        "(IDirectSound_CreateSoundBuffer returned: %s)\n", error_text);
+    g_free (error_text);
     tmp = gst_caps_new_empty_simple ("audio/x-ac3");
     tmp2 = gst_caps_subtract (caps, tmp);
     gst_caps_unref (tmp);
@@ -836,9 +852,10 @@ gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink,
     GST_INFO_OBJECT (dsoundsink, "AC3 passthrough supported");
     hRes = IDirectSoundBuffer_Release (tmpBuffer);
     if (FAILED (hRes)) {
+      gchar *error_text = gst_hres_to_string (hRes);
       GST_DEBUG_OBJECT (dsoundsink,
-          "(IDirectSoundBuffer_Release returned: %s)\n",
-          DXGetErrorString9 (hRes));
+          "(IDirectSoundBuffer_Release returned: %s)\n", error_text);
+      g_free (error_text);
     }
   }
 #else
@@ -967,3 +984,28 @@ gst_directsound_sink_set_device (GstDirectSoundSink * dsoundsink,
   g_free (dsoundsink->device_id);
   dsoundsink->device_id = g_strdup (device_id);
 }
+
+/* Converts a HRESULT error to a text string
+ * LPTSTR is either a */
+static gchar *
+gst_hres_to_string (HRESULT hRes)
+{
+  DWORD flags;
+  gchar *ret_text;
+  LPTSTR error_text = NULL;
+
+  flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER
+      | FORMAT_MESSAGE_IGNORE_INSERTS;
+  FormatMessage (flags, NULL, hRes, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
+      (LPTSTR) & error_text, 0, NULL);
+
+#ifdef UNICODE
+  /* If UNICODE is defined, LPTSTR is LPWSTR which is UTF-16 */
+  ret_text = g_utf16_to_utf8 (error_text, 0, NULL, NULL, NULL);
+#else
+  ret_text = g_strdup (error_text);
+#endif
+
+  LocalFree (error_text);
+  return ret_text;
+}

sys/directsound/gstdirectsoundsink.h

@@ -34,7 +34,6 @@
 #include <gst/audio/gstaudiosink.h>
 
 #include <windows.h>
-#include <dxerr9.h>
 #include <dsound.h>
 #include <mmreg.h> 
 #include <ks.h>