vdpau: Add an allocation function for AVVDPAUContext.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

1 files changed, 9 insertions, 1 deletions

diff --git a/libavcodec/vdpau.h b/libavcodec/vdpau.h
index 08116bf637..210d517d83 100644
--- a/libavcodec/vdpau.h
+++ b/libavcodec/vdpau.h
@@ -73,7 +73,8 @@ union AVVDPAUPictureInfo {
 /**
  * This structure is used to share data between the libavcodec library and
  * the client video application.
- * The user shall zero-allocate the structure and make it available as
+ * The user shall allocate the structure via the av_alloc_vdpau_hwaccel
+ * function and make it available as
  * AVCodecContext.hwaccel_context. Members can be set by the user once
  * during initialization or through each AVCodecContext.get_buffer()
  * function call. In any case, they must be valid prior to calling
@@ -130,6 +131,13 @@ typedef struct AVVDPAUContext {
 #endif
 } AVVDPAUContext;
 
+/**
+ * @brief allocation function for AVVDPAUContext
+ *
+ * Allows extending the struct without breaking API/ABI
+ */
+AVVDPAUContext *av_alloc_vdpaucontext(void);
+
 #if FF_API_CAP_VDPAU
 /** @brief The videoSurface is used for rendering. */
 #define FF_VDPAU_STATE_USED_FOR_RENDER 1