Fix modules_unittests on iOS.

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.cc

 /*
  *  Copyright (c) 2015 The WebRTC 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 246 matching lines @@
 
   // The buffer we receive via RTP has 00 00 00 01 start code artifically
   // embedded by the RTP depacketizer. Extract NALU information.
   // TODO(tkchin): handle potential case where sps and pps are delivered
   // separately.
   NaluType first_nalu_type = ParseNaluType(annexb_buffer[4]);
   bool is_first_nalu_type_sps = first_nalu_type == kSps;
   if (is_first_nalu_type_sps)
     return true;
   bool is_first_nalu_type_aud = first_nalu_type == kAud;
-  // Start code + access unit delimiter + start code = 4 + 2 + 4 = 10.
-  if (!is_first_nalu_type_aud || annexb_buffer_size <= 10u)
+  // Start code + access unit delimiter + start code = 4 + 1 + 4 = 9.

[tkchin_webrtc, 2016/09/28 10:35:02]

I looked and I think that 10 is correct
start code + nalu type byte + aud byte + start code = 4 + 1 + 1 + 4 = 10

[kthelgason, 2016/09/28 10:46:45]

You're right, I forgot to count the type byte. Adding 1-digit numbers can be
hard! The actual aud byte is missing from the test. I'll change it.

+  if (!is_first_nalu_type_aud || annexb_buffer_size <= 9u)
     return false;
-  NaluType second_nalu_type = ParseNaluType(annexb_buffer[10]);
+  NaluType second_nalu_type = ParseNaluType(annexb_buffer[9]);
   bool is_second_nalu_type_sps = second_nalu_type == kSps;
   return is_second_nalu_type_sps;
 }
 
 CMVideoFormatDescriptionRef CreateVideoFormatDescription(
     const uint8_t* annexb_buffer,
     size_t annexb_buffer_size) {
   if (!H264AnnexBBufferHasVideoFormatDescription(annexb_buffer,
                                                  annexb_buffer_size)) {
     return nullptr;
@@ skipping 107 matching lines @@
   return true;
 }
 
 size_t AvccBufferWriter::BytesRemaining() const {
   return length_ - offset_;
 }
 
 }  // namespace webrtc
 
 #endif  // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)