libvpx: Pull from upstream

source/libvpx/vp9/vp9_dx_iface.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 137 matching lines @@
       if (!vp9_read_sync_code(&rb))
         return VPX_CODEC_UNSUP_BITSTREAM;
 
       if (profile > PROFILE_1)
         rb.bit_offset += 1;  // Bit-depth 10 or 12
       colorspace = vp9_rb_read_literal(&rb, 3);
       if (colorspace != sRGB) {
         rb.bit_offset += 1;  // [16,235] (including xvycc) vs [0,255] range
         if (profile == PROFILE_1 || profile == PROFILE_3) {
           rb.bit_offset += 2;  // subsampling x/y
-          rb.bit_offset += 1;  // has extra plane
+          rb.bit_offset += 1;  // unused
         }
       } else {
         if (profile == PROFILE_1 || profile == PROFILE_3) {
-          rb.bit_offset += 1;  // has extra plane
+          rb.bit_offset += 1;  // unused
         } else {
           // RGB is only available in version 1
           return VPX_CODEC_UNSUP_BITSTREAM;
         }
       }
       vp9_read_frame_size(&rb, (int *)&si->w, (int *)&si->h);
     } else {
       intra_only_flag = show_frame ? 0 : vp9_rb_read_bit(&rb);
       rb.bit_offset += error_resilient ? 0 : 2;  // reset_frame_context
 
@@ skipping 536 matching lines @@
   { // NOLINT
     NOT_IMPLEMENTED,  // vpx_codec_enc_cfg_map_t
     NOT_IMPLEMENTED,  // vpx_codec_encode_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_get_cx_data_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_enc_config_set_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_get_global_headers_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_get_preview_frame_fn_t
     NOT_IMPLEMENTED   // vpx_codec_enc_mr_get_mem_loc_fn_t
   }
 };