Add a new interface for exporting surfaces

Signed-off-by: Mark Thompson <sw@jkqxz.net>

3 files changed, 90 insertions, 1 deletions

diff --git a/va/va.c b/va/va.c
index 86ca317..ea0cfd2 100644
--- a/va/va.c
+++ b/va/va.c
@@ -1457,6 +1457,23 @@ vaReleaseBufferHandle(VADisplay dpy, VABufferID buf_id)
     return ctx->vtable->vaReleaseBufferHandle(ctx, buf_id);
 }
 
+VAStatus
+vaExportSurfaceHandle(VADisplay dpy, VASurfaceID surface_id,
+                      uint32_t mem_type, uint32_t flags,
+                      void *descriptor)
+{
+    VADriverContextP ctx;
+
+    CHECK_DISPLAY(dpy);
+    ctx = CTX(dpy);
+
+    if (!ctx->vtable->vaExportSurfaceHandle)
+        return VA_STATUS_ERROR_UNIMPLEMENTED;
+    return ctx->vtable->vaExportSurfaceHandle(ctx, surface_id,
+                                              mem_type, flags,
+                                              descriptor);
+}
+
 VAStatus vaBeginPicture (
     VADisplay dpy,
     VAContextID context,
diff --git a/va/va.h b/va/va.h
index c6d435a..073a5a7 100644
--- a/va/va.h
+++ b/va/va.h
@@ -3303,6 +3303,68 @@ vaAcquireBufferHandle(VADisplay dpy, VABufferID buf_id, VABufferInfo *buf_info);
 VAStatus
 vaReleaseBufferHandle(VADisplay dpy, VABufferID buf_id);
 
+/** @name vaExportSurfaceHandle() flags
+ *
+ * @{
+ */
+/** Export surface to be read by external API. */
+#define VA_EXPORT_SURFACE_READ_ONLY        0x0001
+/** Export surface to be written by external API. */
+#define VA_EXPORT_SURFACE_WRITE_ONLY       0x0002
+/** Export surface to be both read and written by external API. */
+#define VA_EXPORT_SURFACE_READ_WRITE       0x0003
+/** Export surface with separate layers.
+ *
+ * For example, NV12 surfaces should be exported as two separate
+ * planes for luma and chroma.
+ */
+#define VA_EXPORT_SURFACE_SEPARATE_LAYERS  0x0004
+/** Export surface with composed layers.
+ *
+ * For example, NV12 surfaces should be exported as a single NV12
+ * composed object.
+ */
+#define VA_EXPORT_SURFACE_COMPOSED_LAYERS  0x0008
+
+/** @} */
+
+/**
+ * \brief Export a handle to a surface for use with an external API
+ *
+ * The exported handles are owned by the caller, and the caller is
+ * responsible for freeing them when no longer needed (e.g. by closing
+ * DRM PRIME file descriptors).
+ *
+ * This does not perform any synchronisation.  If the contents of the
+ * surface will be read, vaSyncSurface() must be called before doing so.
+ * If the contents of the surface are written, then all operations must
+ * be completed externally before using the surface again by via VA-API
+ * functions.
+ *
+ * @param[in] dpy          VA display.
+ * @param[in] surface_id   Surface to export.
+ * @param[in] mem_type     Memory type to export to.
+ * @param[in] flags        Combination of flags to apply
+ *   (VA_EXPORT_SURFACE_*).
+ * @param[out] descriptor  Pointer to the descriptor structure to fill
+ *   with the handle details.  The type of this structure depends on
+ *   the value of mem_type.
+ *
+ * @return Status code:
+ * - VA_STATUS_SUCCESS:    Success.
+ * - VA_STATUS_ERROR_INVALID_DISPLAY:  The display is not valid.
+ * - VA_STATUS_ERROR_UNIMPLEMENTED:  The driver does not implement
+ *     this interface.
+ * - VA_STATUS_ERROR_INVALID_SURFACE:  The surface is not valid, or
+ *     the surface is not exportable in the specified way.
+ * - VA_STATUS_ERROR_UNSUPPORTED_MEMORY_TYPE:  The driver does not
+ *     support exporting surfaces to the specified memory type.
+ */
+VAStatus vaExportSurfaceHandle(VADisplay dpy,
+                               VASurfaceID surface_id,
+                               uint32_t mem_type, uint32_t flags,
+                               void *descriptor);
+
 /**
  * Render (Video Decode/Encode/Processing) Pictures
  *
diff --git a/va/va_backend.h b/va/va_backend.h
index f095c83..8deb979 100644
--- a/va/va_backend.h
+++ b/va/va_backend.h
@@ -476,8 +476,18 @@ struct VADriverVTable
             VAProcessingRateParameter *proc_buf,/* in */
             unsigned int *processing_rate	/* out */
         );
+
+        VAStatus
+        (*vaExportSurfaceHandle)(
+            VADriverContextP    ctx,
+            VASurfaceID         surface_id,     /* in */
+            uint32_t            mem_type,       /* in */
+            uint32_t            flags,          /* in */
+            void               *descriptor      /* out */
+        );
+
         /** \brief Reserved bytes for future use, must be zero */
-        unsigned long reserved[58];
+        unsigned long reserved[57];
 };
 
 struct VADriverContext