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+# WebRTC Obj-C SDK
+
+This directory contains the Obj-C SDK for WebRTC. This includes wrappers for the
+C++ PeerConnection API and some platform specific components for iOS and macOS.
+
+## Organization
+
+- api/
+
+  Wrappers around classes and functions in the C++ API for creating and
+  configuring peer connections, etc.
+
+- base/
+
+  This directory contains some base protocols and classes that are used by both
+  the platform specific components and the SDK wrappers.
+
+- components/
+
+  These are the platform specific components. Contains components for handling
+  audio, capturing and rendering video, encoding and decoding using the
+  platform's hardware codec implementation and for representing video frames
+  in the platform's native format.
+
+- helpers/
+
+  These files are not WebRTC specific, but are general helper classes and
+  utilities for the Cocoa platforms.
+
+- native/
+
+  APIs for wrapping the platform specific components and using them with the
+  C++ API.
+
+- unittests/
+
+  This directory contains the tests.