lavc/libx264: Support monochrome encoding.

libavcodec/libx264.c

@@ -161,6 +161,8 @@ static int avfmt2_num_planes(int avfmt)
     case AV_PIX_FMT_BGR0:
     case AV_PIX_FMT_BGR24:
     case AV_PIX_FMT_RGB24:
+    case AV_PIX_FMT_GRAY8:
+    case AV_PIX_FMT_GRAY10:
         return 1;
 
     default:
@@ -442,6 +444,10 @@ static int convert_pix_fmt(enum AVPixelFormat pix_fmt)
     case AV_PIX_FMT_NV20:      return X264_CSP_NV16;
 #ifdef X264_CSP_NV21
     case AV_PIX_FMT_NV21:      return X264_CSP_NV21;
+#endif
+#ifdef X264_CSP_I400
+    case AV_PIX_FMT_GRAY8:
+    case AV_PIX_FMT_GRAY10:    return X264_CSP_I400;
 #endif
     };
     return 0;
@@ -885,6 +891,10 @@ static const enum AVPixelFormat pix_fmts_all[] = {
     AV_PIX_FMT_YUV422P10,
     AV_PIX_FMT_YUV444P10,
     AV_PIX_FMT_NV20,
+#ifdef X264_CSP_I400
+    AV_PIX_FMT_GRAY8,
+    AV_PIX_FMT_GRAY10,
+#endif
     AV_PIX_FMT_NONE
 };
 #if CONFIG_LIBX264RGB_ENCODER

libavcodec/version.h

@@ -29,7 +29,7 @@
 
 #define LIBAVCODEC_VERSION_MAJOR  58
 #define LIBAVCODEC_VERSION_MINOR  22
-#define LIBAVCODEC_VERSION_MICRO 100
+#define LIBAVCODEC_VERSION_MICRO 101
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \