初步添加rtsp转webrtc相关功能

cmake/FindSRTP.cmake

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+############################################################################
+# FindSRTP.txt
+# Copyright (C) 2014  Belledonne Communications, Grenoble France
+#
+############################################################################
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+############################################################################
+#
+# - Find the SRTP include file and library
+#
+#  SRTP_FOUND - system has SRTP
+#  SRTP_INCLUDE_DIRS - the SRTP include directory
+#  SRTP_LIBRARIES - The libraries needed to use SRTP
+
+set(_SRTP_ROOT_PATHS
+        ${CMAKE_INSTALL_PREFIX}
+        )
+
+find_path(SRTP_INCLUDE_DIRS
+        NAMES srtp2/srtp.h
+        HINTS _SRTP_ROOT_PATHS
+        PATH_SUFFIXES include
+        )
+
+if(SRTP_INCLUDE_DIRS)
+    set(HAVE_SRTP_SRTP_H 1)
+endif()
+
+find_library(SRTP_LIBRARIES
+        NAMES srtp2
+        HINTS ${_SRTP_ROOT_PATHS}
+        PATH_SUFFIXES bin lib
+        )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SRTP
+        DEFAULT_MSG
+        SRTP_INCLUDE_DIRS SRTP_LIBRARIES HAVE_SRTP_SRTP_H
+        )
+
+mark_as_advanced(SRTP_INCLUDE_DIRS SRTP_LIBRARIES HAVE_SRTP_SRTP_H)