audio/channel_send_frame_transformer_delegate_unittest.cc - src - Git at Google

 /*
  *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include "audio/channel_send_frame_transformer_delegate.h"

 #include <cstdint>
 #include <memory>
 #include <optional>
 #include <utility>
 #include <vector>

 #include "absl/memory/memory.h"
 #include "api/array_view.h"
 #include "api/frame_transformer_interface.h"
 #include "api/make_ref_counted.h"
 #include "api/scoped_refptr.h"
 #include "api/test/mock_frame_transformer.h"
 #include "api/test/mock_transformable_audio_frame.h"
 #include "modules/audio_coding/include/audio_coding_module_typedefs.h"
 #include "rtc_base/task_queue_for_test.h"
 #include "test/gmock.h"
 #include "test/gtest.h"

 namespace webrtc {
 namespace {

 using ::testing::_;
 using ::testing::ElementsAre;
 using ::testing::ElementsAreArray;
 using ::testing::NiceMock;
 using ::testing::Optional;
 using ::testing::Return;
 using ::testing::SaveArg;

 const uint8_t mock_data[] = {1, 2, 3, 4};

 class MockChannelSend {
  public:
   MockChannelSend() = default;
   ~MockChannelSend() = default;

   MOCK_METHOD(int32_t,
               SendFrame,
               (AudioFrameType frameType,
                uint8_t payloadType,
                uint32_t rtp_timestamp,
                rtc::ArrayView<const uint8_t> payload,
                int64_t absolute_capture_timestamp_ms,
                rtc::ArrayView<const uint32_t> csrcs,
                std::optional<uint8_t> audio_level_dbov));

   ChannelSendFrameTransformerDelegate::SendFrameCallback callback() {
     return [this](AudioFrameType frameType, uint8_t payloadType,
                   uint32_t rtp_timestamp, rtc::ArrayView<const uint8_t> payload,
                   int64_t absolute_capture_timestamp_ms,
                   rtc::ArrayView<const uint32_t> csrcs,
                   std::optional<uint8_t> audio_level_dbov) {
       return SendFrame(frameType, payloadType, rtp_timestamp, payload,
                        absolute_capture_timestamp_ms, csrcs, audio_level_dbov);
     };
   }
 };

 std::unique_ptr<TransformableAudioFrameInterface> CreateMockReceiverFrame(
     const std::vector<uint32_t>& csrcs,
     std::optional<uint8_t> audio_level_dbov) {
   std::unique_ptr<MockTransformableAudioFrame> mock_frame =
       std::make_unique<NiceMock<MockTransformableAudioFrame>>();
   rtc::ArrayView<const uint8_t> payload(mock_data);
   ON_CALL(*mock_frame, GetData).WillByDefault(Return(payload));
   ON_CALL(*mock_frame, GetPayloadType).WillByDefault(Return(0));
   ON_CALL(*mock_frame, GetDirection)
       .WillByDefault(Return(TransformableFrameInterface::Direction::kReceiver));
   ON_CALL(*mock_frame, GetContributingSources).WillByDefault(Return(csrcs));
   ON_CALL(*mock_frame, SequenceNumber).WillByDefault(Return(987654321));
   ON_CALL(*mock_frame, AudioLevel).WillByDefault(Return(audio_level_dbov));
   return mock_frame;
 }

 std::unique_ptr<TransformableAudioFrameInterface> CreateFrame() {
   TaskQueueForTest channel_queue("channel_queue");
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<NiceMock<MockFrameTransformer>>();
   MockChannelSend mock_channel;
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           mock_channel.callback(), mock_frame_transformer, channel_queue.Get());

   std::unique_ptr<TransformableFrameInterface> frame;
   ON_CALL(*mock_frame_transformer, Transform)
       .WillByDefault(
           [&frame](
               std::unique_ptr<TransformableFrameInterface> transform_frame) {
             frame = std::move(transform_frame);
           });
   delegate->Transform(
       AudioFrameType::kEmptyFrame, 0, 0, mock_data, sizeof(mock_data), 0,
       /*ssrc=*/0, /*mimeType=*/"audio/opus", /*audio_level_dbov=*/123);
   return absl::WrapUnique(
       static_cast<webrtc::TransformableAudioFrameInterface*>(frame.release()));
 }

 // Test that the delegate registers itself with the frame transformer on Init().
 TEST(ChannelSendFrameTransformerDelegateTest,
      RegisterTransformedFrameCallbackOnInit) {
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<MockFrameTransformer>();
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           ChannelSendFrameTransformerDelegate::SendFrameCallback(),
           mock_frame_transformer, nullptr);
   EXPECT_CALL(*mock_frame_transformer, RegisterTransformedFrameCallback);
   delegate->Init();
 }

 // Test that the delegate unregisters itself from the frame transformer on
 // Reset().
 TEST(ChannelSendFrameTransformerDelegateTest,
      UnregisterTransformedFrameCallbackOnReset) {
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<MockFrameTransformer>();
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           ChannelSendFrameTransformerDelegate::SendFrameCallback(),
           mock_frame_transformer, nullptr);
   EXPECT_CALL(*mock_frame_transformer, UnregisterTransformedFrameCallback);
   delegate->Reset();
 }

 // Test that when the delegate receives a transformed frame from the frame
 // transformer, it passes it to the channel using the SendFrameCallback.
 TEST(ChannelSendFrameTransformerDelegateTest,
      TransformRunsChannelSendCallback) {
   TaskQueueForTest channel_queue("channel_queue");
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<NiceMock<MockFrameTransformer>>();
   MockChannelSend mock_channel;
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           mock_channel.callback(), mock_frame_transformer, channel_queue.Get());
   rtc::scoped_refptr<TransformedFrameCallback> callback;
   EXPECT_CALL(*mock_frame_transformer, RegisterTransformedFrameCallback)
       .WillOnce(SaveArg<0>(&callback));
   delegate->Init();
   ASSERT_TRUE(callback);

   const uint8_t data[] = {1, 2, 3, 4};
   EXPECT_CALL(mock_channel, SendFrame);
   ON_CALL(*mock_frame_transformer, Transform)
       .WillByDefault(
           [&callback](std::unique_ptr<TransformableFrameInterface> frame) {
             callback->OnTransformedFrame(std::move(frame));
           });
   delegate->Transform(AudioFrameType::kEmptyFrame, 0, 0, data, sizeof(data), 0,
                       /*ssrc=*/0, /*mimeType=*/"audio/opus",
                       /*audio_level_dbov=*/31);
   channel_queue.WaitForPreviouslyPostedTasks();
 }

 // Test that when the delegate receives a Incoming frame from the frame
 // transformer, it passes it to the channel using the SendFrameCallback.
 TEST(ChannelSendFrameTransformerDelegateTest,
      TransformRunsChannelSendCallbackForIncomingFrame) {
   TaskQueueForTest channel_queue("channel_queue");
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<NiceMock<MockFrameTransformer>>();
   MockChannelSend mock_channel;
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           mock_channel.callback(), mock_frame_transformer, channel_queue.Get());
   rtc::scoped_refptr<TransformedFrameCallback> callback;
   EXPECT_CALL(*mock_frame_transformer, RegisterTransformedFrameCallback)
       .WillOnce(SaveArg<0>(&callback));
   delegate->Init();
   ASSERT_TRUE(callback);

   const std::vector<uint32_t> csrcs = {123, 234, 345, 456};
   const uint8_t audio_level_dbov = 17;
   EXPECT_CALL(mock_channel, SendFrame).Times(0);
   EXPECT_CALL(mock_channel,
               SendFrame(_, 0, 0, ElementsAreArray(mock_data), _,
                         ElementsAreArray(csrcs), Optional(audio_level_dbov)));
   ON_CALL(*mock_frame_transformer, Transform)
       .WillByDefault(
           [&](std::unique_ptr<TransformableFrameInterface> /* frame */) {
             callback->OnTransformedFrame(CreateMockReceiverFrame(
                 csrcs, std::optional<uint8_t>(audio_level_dbov)));
           });
   delegate->Transform(AudioFrameType::kEmptyFrame, 0, 0, mock_data,
                       sizeof(mock_data), 0,
                       /*ssrc=*/0, /*mimeType=*/"audio/opus",
                       /*audio_level_dbov=*/std::nullopt);
   channel_queue.WaitForPreviouslyPostedTasks();
 }

 // Test that if the delegate receives a transformed frame after it has been
 // reset, it does not run the SendFrameCallback, as the channel is destroyed
 // after resetting the delegate.
 TEST(ChannelSendFrameTransformerDelegateTest,
      OnTransformedDoesNotRunChannelSendCallbackAfterReset) {
   TaskQueueForTest channel_queue("channel_queue");
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<testing::NiceMock<MockFrameTransformer>>();
   MockChannelSend mock_channel;
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           mock_channel.callback(), mock_frame_transformer, channel_queue.Get());

   delegate->Reset();
   EXPECT_CALL(mock_channel, SendFrame).Times(0);
   delegate->OnTransformedFrame(std::make_unique<MockTransformableAudioFrame>());
   channel_queue.WaitForPreviouslyPostedTasks();
 }

 TEST(ChannelSendFrameTransformerDelegateTest, ShortCircuitingSkipsTransform) {
   TaskQueueForTest channel_queue("channel_queue");
   rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
       rtc::make_ref_counted<testing::NiceMock<MockFrameTransformer>>();
   MockChannelSend mock_channel;
   rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
       rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
           mock_channel.callback(), mock_frame_transformer, channel_queue.Get());

   delegate->StartShortCircuiting();

   // Will not call the actual transformer.
   EXPECT_CALL(*mock_frame_transformer, Transform).Times(0);
   // Will pass the frame straight to the channel.
   EXPECT_CALL(mock_channel, SendFrame);
   const uint8_t data[] = {1, 2, 3, 4};
   delegate->Transform(AudioFrameType::kEmptyFrame, 0, 0, data, sizeof(data), 0,
                       /*ssrc=*/0, /*mimeType=*/"audio/opus",
                       /*audio_level_dbov=*/std::nullopt);
 }

 TEST(ChannelSendFrameTransformerDelegateTest,
      CloningSenderFramePreservesInformation) {
   std::unique_ptr<TransformableAudioFrameInterface> frame = CreateFrame();
   std::unique_ptr<TransformableAudioFrameInterface> cloned_frame =
       CloneSenderAudioFrame(frame.get());

   EXPECT_EQ(cloned_frame->GetTimestamp(), frame->GetTimestamp());
   EXPECT_EQ(cloned_frame->GetSsrc(), frame->GetSsrc());
   EXPECT_EQ(cloned_frame->Type(), frame->Type());
   EXPECT_EQ(cloned_frame->GetPayloadType(), frame->GetPayloadType());
   EXPECT_EQ(cloned_frame->GetMimeType(), frame->GetMimeType());
   EXPECT_THAT(cloned_frame->GetContributingSources(),
               ElementsAreArray(frame->GetContributingSources()));
   EXPECT_EQ(cloned_frame->AudioLevel(), frame->AudioLevel());
 }

 TEST(ChannelSendFrameTransformerDelegateTest, CloningReceiverFrameWithCsrcs) {
   std::unique_ptr<TransformableAudioFrameInterface> frame =
       CreateMockReceiverFrame(/*csrcs=*/{123, 234, 345},
                               std::optional<uint8_t>(72));
   std::unique_ptr<TransformableAudioFrameInterface> cloned_frame =
       CloneSenderAudioFrame(frame.get());

   EXPECT_EQ(cloned_frame->GetTimestamp(), frame->GetTimestamp());
   EXPECT_EQ(cloned_frame->GetSsrc(), frame->GetSsrc());
   EXPECT_EQ(cloned_frame->Type(), frame->Type());
   EXPECT_EQ(cloned_frame->GetPayloadType(), frame->GetPayloadType());
   EXPECT_EQ(cloned_frame->GetMimeType(), frame->GetMimeType());
   EXPECT_EQ(cloned_frame->AbsoluteCaptureTimestamp(),
             frame->AbsoluteCaptureTimestamp());

   ASSERT_NE(frame->GetContributingSources().size(), 0u);
   EXPECT_THAT(cloned_frame->GetContributingSources(),
               ElementsAreArray(frame->GetContributingSources()));
   EXPECT_EQ(cloned_frame->SequenceNumber(), frame->SequenceNumber());
   EXPECT_EQ(cloned_frame->AudioLevel(), frame->AudioLevel());
 }

 }  // namespace
 }  // namespace webrtc
	/*
	* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include "audio/channel_send_frame_transformer_delegate.h"

	#include <cstdint>
	#include <memory>
	#include <optional>
	#include <utility>
	#include <vector>

	#include "absl/memory/memory.h"
	#include "api/array_view.h"
	#include "api/frame_transformer_interface.h"
	#include "api/make_ref_counted.h"
	#include "api/scoped_refptr.h"
	#include "api/test/mock_frame_transformer.h"
	#include "api/test/mock_transformable_audio_frame.h"
	#include "modules/audio_coding/include/audio_coding_module_typedefs.h"
	#include "rtc_base/task_queue_for_test.h"
	#include "test/gmock.h"
	#include "test/gtest.h"

	namespace webrtc {
	namespace {

	using ::testing::_;
	using ::testing::ElementsAre;
	using ::testing::ElementsAreArray;
	using ::testing::NiceMock;
	using ::testing::Optional;
	using ::testing::Return;
	using ::testing::SaveArg;

	const uint8_t mock_data[] = {1, 2, 3, 4};

	class MockChannelSend {
	public:
	MockChannelSend() = default;
	~MockChannelSend() = default;

	MOCK_METHOD(int32_t,
	SendFrame,
	(AudioFrameType frameType,
	uint8_t payloadType,
	uint32_t rtp_timestamp,
	rtc::ArrayView<const uint8_t> payload,
	int64_t absolute_capture_timestamp_ms,
	rtc::ArrayView<const uint32_t> csrcs,
	std::optional<uint8_t> audio_level_dbov));

	ChannelSendFrameTransformerDelegate::SendFrameCallback callback() {
	return [this](AudioFrameType frameType, uint8_t payloadType,
	uint32_t rtp_timestamp, rtc::ArrayView<const uint8_t> payload,
	int64_t absolute_capture_timestamp_ms,
	rtc::ArrayView<const uint32_t> csrcs,
	std::optional<uint8_t> audio_level_dbov) {
	return SendFrame(frameType, payloadType, rtp_timestamp, payload,
	absolute_capture_timestamp_ms, csrcs, audio_level_dbov);
	};
	}
	};

	std::unique_ptr<TransformableAudioFrameInterface> CreateMockReceiverFrame(
	const std::vector<uint32_t>& csrcs,
	std::optional<uint8_t> audio_level_dbov) {
	std::unique_ptr<MockTransformableAudioFrame> mock_frame =
	std::make_unique<NiceMock<MockTransformableAudioFrame>>();
	rtc::ArrayView<const uint8_t> payload(mock_data);
	ON_CALL(*mock_frame, GetData).WillByDefault(Return(payload));
	ON_CALL(*mock_frame, GetPayloadType).WillByDefault(Return(0));
	ON_CALL(*mock_frame, GetDirection)
	.WillByDefault(Return(TransformableFrameInterface::Direction::kReceiver));
	ON_CALL(*mock_frame, GetContributingSources).WillByDefault(Return(csrcs));
	ON_CALL(*mock_frame, SequenceNumber).WillByDefault(Return(987654321));
	ON_CALL(*mock_frame, AudioLevel).WillByDefault(Return(audio_level_dbov));
	return mock_frame;
	}

	std::unique_ptr<TransformableAudioFrameInterface> CreateFrame() {
	TaskQueueForTest channel_queue("channel_queue");
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<NiceMock<MockFrameTransformer>>();
	MockChannelSend mock_channel;
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	mock_channel.callback(), mock_frame_transformer, channel_queue.Get());

	std::unique_ptr<TransformableFrameInterface> frame;
	ON_CALL(*mock_frame_transformer, Transform)
	.WillByDefault(
	[&frame](
	std::unique_ptr<TransformableFrameInterface> transform_frame) {
	frame = std::move(transform_frame);
	});
	delegate->Transform(
	AudioFrameType::kEmptyFrame, 0, 0, mock_data, sizeof(mock_data), 0,
	/ssrc=/0, /mimeType=/"audio/opus", /audio_level_dbov=/123);
	return absl::WrapUnique(
	static_cast<webrtc::TransformableAudioFrameInterface*>(frame.release()));
	}

	// Test that the delegate registers itself with the frame transformer on Init().
	TEST(ChannelSendFrameTransformerDelegateTest,
	RegisterTransformedFrameCallbackOnInit) {
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<MockFrameTransformer>();
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	ChannelSendFrameTransformerDelegate::SendFrameCallback(),
	mock_frame_transformer, nullptr);
	EXPECT_CALL(*mock_frame_transformer, RegisterTransformedFrameCallback);
	delegate->Init();
	}

	// Test that the delegate unregisters itself from the frame transformer on
	// Reset().
	TEST(ChannelSendFrameTransformerDelegateTest,
	UnregisterTransformedFrameCallbackOnReset) {
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<MockFrameTransformer>();
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	ChannelSendFrameTransformerDelegate::SendFrameCallback(),
	mock_frame_transformer, nullptr);
	EXPECT_CALL(*mock_frame_transformer, UnregisterTransformedFrameCallback);
	delegate->Reset();
	}

	// Test that when the delegate receives a transformed frame from the frame
	// transformer, it passes it to the channel using the SendFrameCallback.
	TEST(ChannelSendFrameTransformerDelegateTest,
	TransformRunsChannelSendCallback) {
	TaskQueueForTest channel_queue("channel_queue");
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<NiceMock<MockFrameTransformer>>();
	MockChannelSend mock_channel;
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	mock_channel.callback(), mock_frame_transformer, channel_queue.Get());
	rtc::scoped_refptr<TransformedFrameCallback> callback;
	EXPECT_CALL(*mock_frame_transformer, RegisterTransformedFrameCallback)
	.WillOnce(SaveArg<0>(&callback));
	delegate->Init();
	ASSERT_TRUE(callback);

	const uint8_t data[] = {1, 2, 3, 4};
	EXPECT_CALL(mock_channel, SendFrame);
	ON_CALL(*mock_frame_transformer, Transform)
	.WillByDefault(
	[&callback](std::unique_ptr<TransformableFrameInterface> frame) {
	callback->OnTransformedFrame(std::move(frame));
	});
	delegate->Transform(AudioFrameType::kEmptyFrame, 0, 0, data, sizeof(data), 0,
	/ssrc=/0, /mimeType=/"audio/opus",
	/audio_level_dbov=/31);
	channel_queue.WaitForPreviouslyPostedTasks();
	}

	// Test that when the delegate receives a Incoming frame from the frame
	// transformer, it passes it to the channel using the SendFrameCallback.
	TEST(ChannelSendFrameTransformerDelegateTest,
	TransformRunsChannelSendCallbackForIncomingFrame) {
	TaskQueueForTest channel_queue("channel_queue");
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<NiceMock<MockFrameTransformer>>();
	MockChannelSend mock_channel;
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	mock_channel.callback(), mock_frame_transformer, channel_queue.Get());
	rtc::scoped_refptr<TransformedFrameCallback> callback;
	EXPECT_CALL(*mock_frame_transformer, RegisterTransformedFrameCallback)
	.WillOnce(SaveArg<0>(&callback));
	delegate->Init();
	ASSERT_TRUE(callback);

	const std::vector<uint32_t> csrcs = {123, 234, 345, 456};
	const uint8_t audio_level_dbov = 17;
	EXPECT_CALL(mock_channel, SendFrame).Times(0);
	EXPECT_CALL(mock_channel,
	SendFrame(_, 0, 0, ElementsAreArray(mock_data), _,
	ElementsAreArray(csrcs), Optional(audio_level_dbov)));
	ON_CALL(*mock_frame_transformer, Transform)
	.WillByDefault(
	[&](std::unique_ptr<TransformableFrameInterface> /* frame */) {
	callback->OnTransformedFrame(CreateMockReceiverFrame(
	csrcs, std::optional<uint8_t>(audio_level_dbov)));
	});
	delegate->Transform(AudioFrameType::kEmptyFrame, 0, 0, mock_data,
	sizeof(mock_data), 0,
	/ssrc=/0, /mimeType=/"audio/opus",
	/audio_level_dbov=/std::nullopt);
	channel_queue.WaitForPreviouslyPostedTasks();
	}

	// Test that if the delegate receives a transformed frame after it has been
	// reset, it does not run the SendFrameCallback, as the channel is destroyed
	// after resetting the delegate.
	TEST(ChannelSendFrameTransformerDelegateTest,
	OnTransformedDoesNotRunChannelSendCallbackAfterReset) {
	TaskQueueForTest channel_queue("channel_queue");
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<testing::NiceMock<MockFrameTransformer>>();
	MockChannelSend mock_channel;
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	mock_channel.callback(), mock_frame_transformer, channel_queue.Get());

	delegate->Reset();
	EXPECT_CALL(mock_channel, SendFrame).Times(0);
	delegate->OnTransformedFrame(std::make_unique<MockTransformableAudioFrame>());
	channel_queue.WaitForPreviouslyPostedTasks();
	}

	TEST(ChannelSendFrameTransformerDelegateTest, ShortCircuitingSkipsTransform) {
	TaskQueueForTest channel_queue("channel_queue");
	rtc::scoped_refptr<MockFrameTransformer> mock_frame_transformer =
	rtc::make_ref_counted<testing::NiceMock<MockFrameTransformer>>();
	MockChannelSend mock_channel;
	rtc::scoped_refptr<ChannelSendFrameTransformerDelegate> delegate =
	rtc::make_ref_counted<ChannelSendFrameTransformerDelegate>(
	mock_channel.callback(), mock_frame_transformer, channel_queue.Get());

	delegate->StartShortCircuiting();

	// Will not call the actual transformer.
	EXPECT_CALL(*mock_frame_transformer, Transform).Times(0);
	// Will pass the frame straight to the channel.
	EXPECT_CALL(mock_channel, SendFrame);
	const uint8_t data[] = {1, 2, 3, 4};
	delegate->Transform(AudioFrameType::kEmptyFrame, 0, 0, data, sizeof(data), 0,
	/ssrc=/0, /mimeType=/"audio/opus",
	/audio_level_dbov=/std::nullopt);
	}

	TEST(ChannelSendFrameTransformerDelegateTest,
	CloningSenderFramePreservesInformation) {
	std::unique_ptr<TransformableAudioFrameInterface> frame = CreateFrame();
	std::unique_ptr<TransformableAudioFrameInterface> cloned_frame =
	CloneSenderAudioFrame(frame.get());

	EXPECT_EQ(cloned_frame->GetTimestamp(), frame->GetTimestamp());
	EXPECT_EQ(cloned_frame->GetSsrc(), frame->GetSsrc());
	EXPECT_EQ(cloned_frame->Type(), frame->Type());
	EXPECT_EQ(cloned_frame->GetPayloadType(), frame->GetPayloadType());
	EXPECT_EQ(cloned_frame->GetMimeType(), frame->GetMimeType());
	EXPECT_THAT(cloned_frame->GetContributingSources(),
	ElementsAreArray(frame->GetContributingSources()));
	EXPECT_EQ(cloned_frame->AudioLevel(), frame->AudioLevel());
	}

	TEST(ChannelSendFrameTransformerDelegateTest, CloningReceiverFrameWithCsrcs) {
	std::unique_ptr<TransformableAudioFrameInterface> frame =
	CreateMockReceiverFrame(/csrcs=/{123, 234, 345},
	std::optional<uint8_t>(72));
	std::unique_ptr<TransformableAudioFrameInterface> cloned_frame =
	CloneSenderAudioFrame(frame.get());

	EXPECT_EQ(cloned_frame->GetTimestamp(), frame->GetTimestamp());
	EXPECT_EQ(cloned_frame->GetSsrc(), frame->GetSsrc());
	EXPECT_EQ(cloned_frame->Type(), frame->Type());
	EXPECT_EQ(cloned_frame->GetPayloadType(), frame->GetPayloadType());
	EXPECT_EQ(cloned_frame->GetMimeType(), frame->GetMimeType());
	EXPECT_EQ(cloned_frame->AbsoluteCaptureTimestamp(),
	frame->AbsoluteCaptureTimestamp());

	ASSERT_NE(frame->GetContributingSources().size(), 0u);
	EXPECT_THAT(cloned_frame->GetContributingSources(),
	ElementsAreArray(frame->GetContributingSources()));
	EXPECT_EQ(cloned_frame->SequenceNumber(), frame->SequenceNumber());
	EXPECT_EQ(cloned_frame->AudioLevel(), frame->AudioLevel());
	}

	} // namespace
	} // namespace webrtc