add prediction direction caps report

report which prediction direction is supported by driver

Signed-off-by: XinfengZhang <carl.zhang@intel.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/va/va.h b/va/va.h
index d847e7b..63d4bb7 100755
--- a/va/va.h
+++ b/va/va.h
@@ -761,6 +761,18 @@ typedef enum
      * attribute value \c VAConfigAttribValMaxFrameSize represent max frame size support   
      */
     VAConfigAttribMaxFrameSize           = 38,
+    /** \brief inter frame prediction directrion attribute. Read-only.
+     * this attribute conveys the prediction direction (backward or forword) for specific config
+     * the value could be  VA_PREDICTION_DIRECTION_XXXX. it can be combined with VAConfigAttribEncMaxRefFrames
+     * to describe reference list , and the prediction direction. if this attrib is not present,both direction
+     * should be supported, no restriction.
+     * for example: normal HEVC encoding , maximum reference frame number in reflist 0 and reflist 1 is deduced
+     * by  VAConfigAttribEncMaxRefFrames. so there are typical P frame, B frame,
+     * if VAConfigAttribPredictionDirection is also present. it will stipulate prediction direction in both
+     * reference list. if only one prediction direction present(such as PREVIOUS),all reference frame should be
+     *  previous frame (PoC < current).
+     */
+    VAConfigAttribPredictionDirection   = 39,
     /**@}*/
     VAConfigAttribTypeMax
 } VAConfigAttribType;
@@ -990,6 +1002,19 @@ typedef union _VAConfigAttribValEncJPEG {
 #define VA_ENC_QUANTIZATION_TRELLIS_SUPPORTED           0x00000001
 /**@}*/
 
+/** @name Attribute values for VAConfigAttribPredictionDirection */
+/**@{*/
+/** \brief Driver support forward reference frame (inter frame for vpx, P frame for H26x MPEG)
+ * can work with the VAConfigAttribEncMaxRefFrames. for example: low delay B frame of HEVC.
+ * these value can be OR'd together. typical value should be VA_PREDICTION_DIRECTION_PREVIOUS
+ * or VA_PREDICTION_DIRECTION_PREVIOUS | VA_PREDICTION_DIRECTION_FUTURE, theoretically, there
+ * are no stream only include future reference frame.
+ */
+#define VA_PREDICTION_DIRECTION_PREVIOUS                0x00000001
+/** \brief Driver support backward prediction frame/slice */
+#define VA_PREDICTION_DIRECTION_FUTURE                  0x00000002
+/**@}*/
+
 /** @name Attribute values for VAConfigAttribEncIntraRefresh */
 /**@{*/
 /** \brief Driver does not support intra refresh */
diff --git a/va/va_str.c b/va/va_str.c
index 4ce1ea1..ffffc6a 100644
--- a/va/va_str.c
+++ b/va/va_str.c
@@ -124,6 +124,7 @@ const char *vaConfigAttribTypeStr(VAConfigAttribType configAttribType)
     TOSTR(VAConfigAttribQPBlockSize);
     TOSTR(VAConfigAttribStats);
     TOSTR(VAConfigAttribMaxFrameSize);
+    TOSTR(VAConfigAttribPredictionDirection);
     case VAConfigAttribTypeMax: break;
     }
     return "<unknown config attribute type>";