Frame Cryptor Support.

feat: Frame Cryptor (aes gcm/cbc). (#54)
feat: key ratchet/derive. (#66)
fix: skip invalid key when decryption failed. (#81)
Improve e2ee, add setSharedKey to KeyProvider. (#88)
add failure tolerance for framecryptor. (#91)
fix h264 freeze. (#93)
Fix/send frame cryptor events from signaling thread (#95)
more improvements for E2EE. (#96)
remove too verbose logs (#107)
Add key ring size to keyProviderOptions. (#109)
Improvements to RTCFrameCryptor (#123)

Co-authored-by: Théo Monnom <theo.monnom@outlook.com>
Co-authored-by: Hiroshi Horie <548776+hiroshihorie@users.noreply.github.com>
Co-authored-by: davidliu <davidliu@deviange.net>

.gitignore

@@ -72,3 +72,9 @@
 /xcodebuild
 /.vscode
 !webrtc/*
+/tmp.patch
+/out-release
+/out-debug
+/node_modules
+/libwebrtc
+/args.txt

api/crypto/BUILD.gn

@@ -16,6 +16,24 @@ group("crypto") {
   ]
 }
 
+rtc_library("frame_crypto_transformer") {
+  visibility = [ "*" ]
+  sources = [
+    "frame_crypto_transformer.cc",
+    "frame_crypto_transformer.h",
+  ]
+
+  deps = [
+   "//api:frame_transformer_interface",
+  ]
+
+  if (rtc_build_ssl) {
+    deps += [ "//third_party/boringssl" ]
+  } else {
+    configs += [ ":external_ssl_library" ]
+  }
+}
+
 rtc_library("options") {
   visibility = [ "*" ]
   sources = [