diff --git a/lib/src/insertable_streams/TODO.md b/lib/src/insertable_streams/TODO.md
new file mode 100644
index 0000000..330a42d
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+++ b/lib/src/insertable_streams/TODO.md
@@ -0,0 +1,3 @@
+# TODO
+
+* RTCRtpSender.createEncodedStreams
diff --git a/lib/src/insertable_streams/audio_data.dart b/lib/src/insertable_streams/audio_data.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/data_view.dart b/lib/src/insertable_streams/data_view.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/encoded_audio_chunk.dart b/lib/src/insertable_streams/encoded_audio_chunk.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/encoded_video_chunk.dart b/lib/src/insertable_streams/encoded_video_chunk.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/media_stream_track_generator.dart b/lib/src/insertable_streams/media_stream_track_generator.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/media_stream_track_processor.dart b/lib/src/insertable_streams/media_stream_track_processor.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/optional.dart b/lib/src/insertable_streams/optional.dart
new file mode 100644
index 0000000..706a872
--- /dev/null
+++ b/lib/src/insertable_streams/optional.dart
@@ -0,0 +1 @@
+class Optional {}
diff --git a/lib/src/insertable_streams/readable_stream.dart b/lib/src/insertable_streams/readable_stream.dart
new file mode 100644
index 0000000..90d2f53
--- /dev/null
+++ b/lib/src/insertable_streams/readable_stream.dart
@@ -0,0 +1,18 @@
+import 'optional.dart';
+import 'readable_stream_default_reader.dart';
+import 'transform_stream.dart';
+import 'writable_stream.dart';
+
+class ReadableStream {
+  bool locked = true;
+  void cancel() {}
+  void pipeThrough(TransformStream sink, [Optional? optional]) =>
+      throw UnimplementedError();
+
+  void pipeTo(WritableStream sink, [Optional? optional]) =>
+      throw UnimplementedError();
+
+  ReadableStreamDefaultReader getReader() => throw UnimplementedError();
+
+  Future<ReadableStream> tee() => throw UnimplementedError();
+}
diff --git a/lib/src/insertable_streams/readable_stream_default_reader.dart b/lib/src/insertable_streams/readable_stream_default_reader.dart
new file mode 100644
index 0000000..bff38bf
--- /dev/null
+++ b/lib/src/insertable_streams/readable_stream_default_reader.dart
@@ -0,0 +1,13 @@
+abstract class ReadableStreamDefaultReader {
+  late bool closed;
+
+  late int desiredSize;
+
+  void abort();
+
+  void close();
+
+  void releaseLock();
+
+  void read(Function(bool done, dynamic value) chunkHandler);
+}
diff --git a/lib/src/insertable_streams/transform_stream.dart b/lib/src/insertable_streams/transform_stream.dart
new file mode 100644
index 0000000..35fe084
--- /dev/null
+++ b/lib/src/insertable_streams/transform_stream.dart
@@ -0,0 +1,15 @@
+import 'readable_stream.dart';
+import 'writable_stream.dart';
+
+class TransformStream {
+  TransformStream(this.readable, this.writable);
+  factory TransformStream.clone(TransformStream transformer) {
+    return transformer._cloneInternal();
+  }
+  TransformStream _cloneInternal() {
+    throw UnimplementedError();
+  }
+
+  ReadableStream readable;
+  WritableStream writable;
+}
diff --git a/lib/src/insertable_streams/transform_stream_default_controller.dart b/lib/src/insertable_streams/transform_stream_default_controller.dart
new file mode 100644
index 0000000..a592fd7
--- /dev/null
+++ b/lib/src/insertable_streams/transform_stream_default_controller.dart
@@ -0,0 +1,9 @@
+abstract class TransformStreamDefaultController {
+  int desiredSize = 0;
+
+  void enqueue(chunk);
+
+  void error(reason);
+
+  void terminate();
+}
diff --git a/lib/src/insertable_streams/video_frame.dart b/lib/src/insertable_streams/video_frame.dart
new file mode 100644
index 0000000..e69de29
diff --git a/lib/src/insertable_streams/writable_stream.dart b/lib/src/insertable_streams/writable_stream.dart
new file mode 100644
index 0000000..7afa0ce
--- /dev/null
+++ b/lib/src/insertable_streams/writable_stream.dart
@@ -0,0 +1,8 @@
+import 'writable_stream_default_writer.dart';
+
+class WritableStream {
+  bool locked = true;
+  void abort() => throw UnimplementedError();
+  void close() => throw UnimplementedError();
+  WritableStreamDefaultWriter getWriter() => throw UnimplementedError();
+}
diff --git a/lib/src/insertable_streams/writable_stream_default_writer.dart b/lib/src/insertable_streams/writable_stream_default_writer.dart
new file mode 100644
index 0000000..d4f26d1
--- /dev/null
+++ b/lib/src/insertable_streams/writable_stream_default_writer.dart
@@ -0,0 +1,13 @@
+abstract class WritableStreamDefaultWriter {
+  late bool closed;
+
+  late int desiredSize;
+
+  void abort();
+
+  void close();
+
+  void releaseLock();
+
+  void write(chunk);
+}