feature/sctp: support sctp data channel

.gitignore

@@ -36,6 +36,9 @@
 *.heap
 *.exe
 
+/tools/extras/out
+/tools/extras/tmp
+
 cmake-build-debug
 /trunk/ide/srs_clion/CMakeCache.txt
 /trunk/ide/srs_clion/CMakeFiles

trunk/3rdparty/README.md

@@ -72,3 +72,7 @@ links:
         http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz
 * speex:
         http://downloads.xiph.org/releases/speex/speex-1.2rc1.tar.gz
+* srtp:
+        https://github.com/cisco/libsrtp/releases/tag/v2.3.0
+* usrsctp: 
+        https://github.com/sctplab/usrsctp

trunk/3rdparty/ffmpeg-4-fit/CONTRIBUTING.md

@@ -0,0 +1,4 @@
+# Note to Github users
+Patches should be submitted to the [ffmpeg-devel mailing list](https://ffmpeg.org/mailman/listinfo/ffmpeg-devel) using `git format-patch` or `git send-email`. Github pull requests should be avoided because they are not part of our review process and **will be ignored**.
+
+See [https://ffmpeg.org/developer.html#Contributing](https://ffmpeg.org/developer.html#Contributing) for more information.

trunk/3rdparty/ffmpeg-4-fit/COPYING.LGPLv3

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
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+other than an Application or a Combined Work as defined below.
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trunk/3rdparty/ffmpeg-4-fit/CREDITS

@@ -0,0 +1,6 @@
+See the Git history of the project (https://git.ffmpeg.org/ffmpeg) to
+get the names of people who have contributed to FFmpeg.
+
+To check the log, you can type the command "git log" in the FFmpeg
+source directory, or browse the online repository at
+https://git.ffmpeg.org/ffmpeg