Add support for arm64

libsrtp.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'use_system_libsrtp%': 0,
   },
   'target_defaults': {
     'defines': [
@@ skipping 28 matching lines @@
           # All Windows architectures are this way.
           'SIZEOF_UNSIGNED_LONG=4',
           'SIZEOF_UNSIGNED_LONG_LONG=8',
          ],
       }],
       ['target_arch=="x64" or target_arch=="ia32"', {
         'defines': [
           'CPU_CISC',
         ],
       }],
-      ['target_arch=="arm" or target_arch=="armv7"', {
+      ['target_arch=="arm" or target_arch=="armv7" or target_arch=="arm64"', {
         'defines': [
           # TODO(leozwang): CPU_RISC doesn't work properly on android/arm
           # platform for unknown reasons, need to investigate the root cause
           # of it. CPU_RISC is used for optimization only, and CPU_CISC should
           # just work just fine, it has been tested on android/arm with srtp
           # test applications and libjingle.
           'CPU_CISC',
         ],
       }],
       ['target_arch=="mipsel"', {
@@ skipping 87 matching lines @@
             'srtp/crypto/include/rand_source.h',
             'srtp/crypto/include/rdb.h',
             'srtp/crypto/include/rdbx.h',
             'srtp/crypto/include/sha1.h',
             'srtp/crypto/include/stat.h',
             'srtp/crypto/include/xfm.h',
 
             # sources
             'srtp/srtp/ekt.c',
             'srtp/srtp/srtp.c',
-        
+
             'srtp/crypto/cipher/aes.c',
             'srtp/crypto/cipher/aes_cbc.c',
             'srtp/crypto/cipher/aes_icm.c',
             'srtp/crypto/cipher/cipher.c',
             'srtp/crypto/cipher/null_cipher.c',
             'srtp/crypto/hash/auth.c',
             'srtp/crypto/hash/hmac.c',
             'srtp/crypto/hash/null_auth.c',
             'srtp/crypto/hash/sha1.c',
             'srtp/crypto/kernel/alloc.c',
@@ skipping 199 matching lines @@
           'link_settings': {
             'libraries': [
               '-lsrtp',
             ],
           },
         }, # target libsrtp
       ], # targets
     }],
   ],
 }