diff --git a/mediapipe/framework/tool/switch/BUILD b/mediapipe/framework/tool/switch/BUILD
new file mode 100644
index 000000000..62f9095ef
--- /dev/null
+++ b/mediapipe/framework/tool/switch/BUILD
@@ -0,0 +1,34 @@
+# Copyright 2023 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+licenses(["notice"])
+
+package(default_visibility = ["//visibility:private"])
+
+cc_library(
+    name = "packet_processor",
+    hdrs = ["packet_processor.h"],
+    visibility = [
+        "//visibility:public",
+    ],
+    deps = [
+        "//mediapipe/framework:calculator_contract",
+        "//mediapipe/framework:collection_item_id",
+        "//mediapipe/framework:packet",
+        "//mediapipe/framework/port:logging",
+        "//mediapipe/framework/port:ret_check",
+        "//mediapipe/framework/port:status",
+    ],
+)
diff --git a/mediapipe/framework/tool/switch/packet_processor.h b/mediapipe/framework/tool/switch/packet_processor.h
new file mode 100644
index 000000000..1789a46c5
--- /dev/null
+++ b/mediapipe/framework/tool/switch/packet_processor.h
@@ -0,0 +1,88 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_FRAMEWORK_TOOL_PACKET_PROCESSOR_H_
+#define MEDIAPIPE_FRAMEWORK_TOOL_PACKET_PROCESSOR_H_
+
+#include <memory>
+
+#include "mediapipe/framework/collection_item_id.h"
+#include "mediapipe/framework/packet.h"
+#include "mediapipe/framework/port/status.h"
+
+namespace mediapipe {
+
+// PacketConsumer accepts several tagged streams of packets.
+class PacketConsumer {
+ public:
+  virtual ~PacketConsumer() = default;
+
+  // Accepts a tagged input packet.
+  virtual absl::Status AddPacket(CollectionItemId id, Packet packet) = 0;
+
+  // Returns the id for each input tag.
+  virtual std::shared_ptr<tool::TagMap> InputTags() = 0;
+};
+
+// PacketConsumer delivers several tagged streams of packets.
+class PacketProducer {
+ public:
+  virtual ~PacketProducer() = default;
+
+  // Connects a consumer to recieve packets from this producer.
+  virtual void SetConsumer(PacketConsumer* consumer) = 0;
+};
+
+// SidePacketConsumer accepts several tagged constant packets.
+class SidePacketConsumer {
+ public:
+  virtual ~SidePacketConsumer() = default;
+
+  // Accepts a tagged input side-packet.
+  virtual absl::Status SetSidePacket(CollectionItemId id, Packet packet) = 0;
+
+  // Returns the id for each input side-packet tag.
+  virtual std::shared_ptr<tool::TagMap> SideInputTags() = 0;
+};
+
+// SidePacketProducer deleivers several tagged constant packets.
+class SidePacketProducer {
+ public:
+  virtual ~SidePacketProducer() = default;
+
+  // Connects a consumer to recieve packets from this producer.
+  virtual void SetSideConsumer(SidePacketConsumer* consumer) = 0;
+};
+
+// PacketProcessor consumes and produces packet streams and constant packets.
+class PacketProcessor : public PacketConsumer,
+                        public PacketProducer,
+                        public SidePacketConsumer,
+                        public SidePacketProducer {
+ public:
+  virtual ~PacketProcessor() = default;
+
+  // Activate this PacketProcessor.
+  virtual absl::Status Start() = 0;
+
+  // Block until this PacketProcessor has no remaining work to do.
+  virtual absl::Status WaitUntilIdle() = 0;
+
+  // Deactivate this PacketProcessor.
+  virtual absl::Status Shutdown() = 0;
+};
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_FRAMEWORK_TOOL_PACKET_PROCESSOR_H_