d3d11va: WindowsPhone requires a mutex around ID3D11VideoContext

1 files changed, 16 insertions, 2 deletions

diff --git a/libavcodec/d3d11va.h b/libavcodec/d3d11va.h
index f5777c26dd..9264ec6ed4 100644
--- a/libavcodec/d3d11va.h
+++ b/libavcodec/d3d11va.h
@@ -53,8 +53,10 @@
  * to the Direct3D11 Libav HWAccel implementation.
  *
  * The application must make it available as AVCodecContext.hwaccel_context.
+ *
+ * Use av_d3d11va_alloc_context() exclusively to allocate an AVD3D11VAContext.
  */
-struct AVD3D11VAContext {
+typedef struct AVD3D11VAContext {
     /**
      * D3D11 decoder object
      */
@@ -89,7 +91,19 @@ struct AVD3D11VAContext {
      * Private to the Libav AVHWAccel implementation
      */
     unsigned report_id;
-};
+
+    /**
+      * Mutex to access video_context
+      */
+    HANDLE  context_mutex;
+} AVD3D11VAContext;
+
+/**
+ * Allocate an AVD3D11VAContext.
+ *
+ * @return Newly-allocated AVD3D11VAContext or NULL on failure.
+ */
+AVD3D11VAContext *av_d3d11va_alloc_context(void);
 
 /**
  * @}