stdin

stdin

diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 04bf585..757b81a 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -37,6 +37,7 @@
 
 #include "libavutil/attributes.h"
 #include "libavutil/avutil.h"
+#include "libavutil/buffer.h"
 #include "libavutil/dict.h"
 #include "libavutil/frame.h"
 #include "libavutil/log.h"
@@ -349,6 +350,15 @@ struct AVFilterContext {
     void *enable;                   ///< parsed expression (AVExpr*)
     double *var_values;             ///< variable values for the enable expression
     int is_disabled;                ///< the enabled state from the last expression evaluation
+
+    /**
+     * For filters which will create hardware frames, sets the device the
+     * filter should create them in.  All other filters will ignore this field:
+     * in particular, a filter which consumes or processes hardware frames will
+     * instead use the hw_frames_ctx field in AVFilterLink to carry the
+     * hardware context information.
+     */
+    AVBufferRef *hw_device_ctx;
 };
 
 /**
@@ -534,6 +544,12 @@ struct AVFilterLink {
      * cleared when a frame is filtered.
      */
     int frame_wanted_out;
+
+    /**
+     * For hwaccel pixel formats, this should be a reference to the
+     * AVHWFramesContext describing the frames.
+     */
+    AVBufferRef *hw_frames_ctx;
 };
 
 /**