libvpxenc: allow aq-mode 4 (equator360)

this was added in 1.6.0
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Zern <jzern@google.com>

doc/encoders.texi

@@ -1666,7 +1666,7 @@ option to 2.
 Enable frame parallel decodability features.
 @item aq-mode
 Set adaptive quantization mode (0: off (default), 1: variance 2: complexity, 3:
-cyclic refresh).
+cyclic refresh, 4: equator360).
 @item colorspace @emph{color-space}
 Set input color space. The VP9 bitstream supports signaling the following
 colorspaces:

libavcodec/libvpxenc.c

@@ -1142,12 +1142,17 @@ static const AVOption vp9_options[] = {
     { "tile-columns",    "Number of tile columns to use, log2",         OFFSET(tile_columns),    AV_OPT_TYPE_INT, {.i64 = -1}, -1, 6, VE},
     { "tile-rows",       "Number of tile rows to use, log2",            OFFSET(tile_rows),       AV_OPT_TYPE_INT, {.i64 = -1}, -1, 2, VE},
     { "frame-parallel",  "Enable frame parallel decodability features", OFFSET(frame_parallel),  AV_OPT_TYPE_BOOL,{.i64 = -1}, -1, 1, VE},
+#if VPX_ENCODER_ABI_VERSION >= 12
+    { "aq-mode",         "adaptive quantization mode",                  OFFSET(aq_mode),         AV_OPT_TYPE_INT, {.i64 = -1}, -1, 4, VE, "aq_mode"},
+#else
     { "aq-mode",         "adaptive quantization mode",                  OFFSET(aq_mode),         AV_OPT_TYPE_INT, {.i64 = -1}, -1, 3, VE, "aq_mode"},
+#endif
     { "none",            "Aq not used",         0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, VE, "aq_mode" },
     { "variance",        "Variance based Aq",   0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, VE, "aq_mode" },
     { "complexity",      "Complexity based Aq", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, VE, "aq_mode" },
     { "cyclic",          "Cyclic Refresh Aq",   0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 0, VE, "aq_mode" },
 #if VPX_ENCODER_ABI_VERSION >= 12
+    { "equator360",      "360 video Aq",        0, AV_OPT_TYPE_CONST, {.i64 = 4}, 0, 0, VE, "aq_mode" },
     {"level", "Specify level", OFFSET(level), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 6.2, VE},
 #endif
 #ifdef VPX_CTRL_VP9E_SET_ROW_MT