Corrected value range of --cpu-used for vp9

This commit removes undefined value options of cpu-used for VP9 and
changed vpxenc prompt to reflect the usable range of [-8,8]

Change-Id: Ib80fef3dbb6ec9aabac45ed13e8ab6fbaf94f55e

vp9/encoder/vp9_speed_features.c

@@ -339,18 +339,10 @@ static void set_rt_speed_feature(VP9_COMP *cpi, SPEED_FEATURES *sf,
     sf->mv.fullpel_search_step_param = 10;
     sf->lpf_pick = LPF_PICK_MINIMAL_LPF;
   }
-
-  if (speed >= 12) {
+  if (speed >= 8) {
     sf->adaptive_rd_thresh = 4;
     sf->mv.subpel_force_stop = 2;
   }
-
-  if (speed >= 13) {
-    int i;
-    sf->max_intra_bsize = BLOCK_32X32;
-    for (i = 0; i < BLOCK_SIZES; ++i)
-      sf->inter_mode_mask[i] = INTER_NEAREST;
-  }
 }
 
 void vp9_set_speed_features_framesize_dependent(VP9_COMP *cpi) {

vp9/vp9_cx_iface.c

@@ -208,7 +208,7 @@ static vpx_codec_err_t validate_config(vpx_codec_alg_priv_t *ctx,
           "or kf_max_dist instead.");
 
   RANGE_CHECK(extra_cfg, enable_auto_alt_ref, 0, 2);
-  RANGE_CHECK(extra_cfg, cpu_used, -16, 16);
+  RANGE_CHECK(extra_cfg, cpu_used, -8, 8);
   RANGE_CHECK_HI(extra_cfg, noise_sensitivity, 6);
   RANGE_CHECK(extra_cfg, tile_columns, 0, 6);
   RANGE_CHECK(extra_cfg, tile_rows, 0, 2);

vpxenc.c

@@ -328,8 +328,10 @@ static const arg_def_t sharpness = ARG_DEF(
     NULL, "sharpness", 1, "Loop filter sharpness (0..7)");
 static const arg_def_t static_thresh = ARG_DEF(
     NULL, "static-thresh", 1, "Motion detection threshold");
-static const arg_def_t cpu_used = ARG_DEF(
+static const arg_def_t cpu_used_vp8 = ARG_DEF(
     NULL, "cpu-used", 1, "CPU Used (-16..16)");
+static const arg_def_t cpu_used_vp9 = ARG_DEF(
+    NULL, "cpu-used", 1, "CPU Used (-8..8)");
 static const arg_def_t auto_altref = ARG_DEF(
     NULL, "auto-alt-ref", 1, "Enable automatic alt reference frames");
 static const arg_def_t arnr_maxframes = ARG_DEF(
@@ -361,7 +363,7 @@ static const arg_def_t screen_content_mode = ARG_DEF(NULL, "screen-content-mode"
 static const arg_def_t token_parts = ARG_DEF(
     NULL, "token-parts", 1, "Number of token partitions to use, log2");
 static const arg_def_t *vp8_args[] = {
-  &cpu_used, &auto_altref, &noise_sens, &sharpness, &static_thresh,
+  &cpu_used_vp8, &auto_altref, &noise_sens, &sharpness, &static_thresh,
   &token_parts, &arnr_maxframes, &arnr_strength, &arnr_type,
   &tune_ssim, &cq_level, &max_intra_rate_pct, &screen_content_mode,
   NULL
@@ -420,7 +422,7 @@ static const arg_def_t tune_content = ARG_DEF_ENUM(
     NULL, "tune-content", 1, "Tune content type", tune_content_enum);
 
 static const arg_def_t *vp9_args[] = {
-  &cpu_used, &auto_altref, &sharpness, &static_thresh,
+  &cpu_used_vp9, &auto_altref, &sharpness, &static_thresh,
   &tile_cols, &tile_rows, &arnr_maxframes, &arnr_strength, &arnr_type,
   &tune_ssim, &cq_level, &max_intra_rate_pct, &max_inter_rate_pct,
   &gf_cbr_boost_pct, &lossless,