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diff --git a/libhb/handbrake/encx264.h b/libhb/handbrake/encx264.h
new file mode 100644
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+++ b/libhb/handbrake/encx264.h
@@ -0,0 +1,65 @@
+/* encx264.h
+
+   Copyright (c) 2003-2019 HandBrake Team
+   This file is part of the HandBrake source code
+   Homepage: <http://handbrake.fr/>.
+   It may be used under the terms of the GNU General Public License v2.
+   For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
+ */
+
+#ifndef HB_ENCX264_H
+#define HB_ENCX264_H
+
+#include "x264.h"
+#include "handbrake/h264_common.h"
+
+/* x264 preferred option names (left) and synonyms (right).
+ * The "preferred" names match names used in x264's param2string function more
+ * closely than their corresponding synonyms, or are just shorter. */
+static const char * const hb_x264_encopt_synonyms[][2] =
+{
+    { "deterministic",  "n-deterministic", },
+    { "level",          "level-idc",       },
+    { "ref",            "frameref",        },
+    { "keyint-min",     "min-keyint",      },
+    { "no-deblock",     "nf",              },
+    { "deblock",        "filter",          },
+    { "cqm",            "cqmfile",         },
+    { "analyse",        "partitions",      },
+    { "weightb",        "weight-b",        },
+    { "direct",         "direct-pred",     },
+    { "merange",        "me-range",        },
+    { "mvrange",        "mv-range",        },
+    { "mvrange-thread", "mv-range-thread", },
+    { "subme",          "subq",            },
+    { "qp",             "qp_constant",     },
+    { "qpmin",          "qp-min",          },
+    { "qpmax",          "qp-max",          },
+    { "qpstep",         "qp-step",         },
+    { "ipratio",        "ip-factor",       },
+    { "pbratio",        "pb-factor",       },
+    { "cplxblur",       "cplx-blur",       },
+    { NULL,             NULL,              },
+};
+
+typedef struct x264_api_s
+{
+    int     bit_depth;
+    void    (*param_default)(x264_param_t*);
+    int     (*param_default_preset)(x264_param_t*, const char*, const char*);
+    int     (*param_apply_profile)(x264_param_t*, const char*);
+    void    (*param_apply_fastfirstpass)(x264_param_t*);
+    int     (*param_parse)(x264_param_t*, const char*, const char*);
+    x264_t* (*encoder_open)(x264_param_t*);
+    int     (*encoder_headers)(x264_t*, x264_nal_t**, int*);
+    int     (*encoder_encode)(x264_t*, x264_nal_t**, int*,
+                              x264_picture_t*, x264_picture_t*);
+    int     (*encoder_delayed_frames)(x264_t*);
+    void    (*encoder_close)(x264_t*);
+    void    (*picture_init)(x264_picture_t*);
+} x264_api_t;
+
+void               hb_x264_global_init(void);
+const x264_api_t * hb_x264_api_get(int bit_depth);
+
+#endif // HB_ENCX264_H