test/fake_encoder.cc - src/webrtc - Git at Google

 /*
  *  Copyright (c) 2013 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 "webrtc/test/fake_encoder.h"

 #include <string.h>

 #include <algorithm>
 #include <memory>

 #include "webrtc/common_types.h"
 #include "webrtc/modules/video_coding/include/video_codec_interface.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/system_wrappers/include/sleep.h"
 #include "webrtc/test/gtest.h"

 namespace webrtc {
 namespace test {

 const int kKeyframeSizeFactor = 10;

 FakeEncoder::FakeEncoder(Clock* clock)
     : clock_(clock),
       callback_(nullptr),
       configured_input_framerate_(-1),
       max_target_bitrate_kbps_(-1),
       pending_keyframe_(true),
       debt_bytes_(0) {
   // Generate some arbitrary not-all-zero data
   for (size_t i = 0; i < sizeof(encoded_buffer_); ++i) {
     encoded_buffer_[i] = static_cast<uint8_t>(i);
   }
 }

 void FakeEncoder::SetMaxBitrate(int max_kbps) {
   RTC_DCHECK_GE(max_kbps, -1);  // max_kbps == -1 disables it.
   rtc::CritScope cs(&crit_sect_);
   max_target_bitrate_kbps_ = max_kbps;
 }

 int32_t FakeEncoder::InitEncode(const VideoCodec* config,
                                 int32_t number_of_cores,
                                 size_t max_payload_size) {
   rtc::CritScope cs(&crit_sect_);
   config_ = *config;
   target_bitrate_.SetBitrate(0, 0, config_.startBitrate * 1000);
   configured_input_framerate_ = config_.maxFramerate;
   pending_keyframe_ = true;
   return 0;
 }

 int32_t FakeEncoder::Encode(const VideoFrame& input_image,
                             const CodecSpecificInfo* codec_specific_info,
                             const std::vector<FrameType>* frame_types) {
   unsigned char max_framerate;
   unsigned char num_simulcast_streams;
   SimulcastStream simulcast_streams[kMaxSimulcastStreams];
   EncodedImageCallback* callback;
   uint32_t target_bitrate_sum_kbps;
   int max_target_bitrate_kbps;
   size_t num_encoded_bytes;
   int framerate;
   VideoCodecMode mode;
   bool keyframe;
   {
     rtc::CritScope cs(&crit_sect_);
     max_framerate = config_.maxFramerate;
     num_simulcast_streams = config_.numberOfSimulcastStreams;
     for (int i = 0; i < num_simulcast_streams; ++i) {
       simulcast_streams[i] = config_.simulcastStream[i];
     }
     callback = callback_;
     target_bitrate_sum_kbps = target_bitrate_.get_sum_kbps();
     max_target_bitrate_kbps = max_target_bitrate_kbps_;
     num_encoded_bytes = sizeof(encoded_buffer_);
     mode = config_.mode;
     if (configured_input_framerate_ > 0) {
       framerate = configured_input_framerate_;
     } else {
       framerate = max_framerate;
     }
     keyframe = pending_keyframe_;
     pending_keyframe_ = false;
   }

   for (FrameType frame_type : *frame_types) {
     if (frame_type == kVideoFrameKey) {
       keyframe = true;
       break;
     }
   }

   RTC_DCHECK_GT(max_framerate, 0);

   size_t bitrate =
       std::max(target_bitrate_sum_kbps, simulcast_streams[0].minBitrate);
   if (max_target_bitrate_kbps > 0)
     bitrate = std::min(bitrate, static_cast<size_t>(max_target_bitrate_kbps));

   size_t bits_available = bitrate * 1000 / framerate;

   RTC_DCHECK_GT(num_simulcast_streams, 0);
   for (unsigned char i = 0; i < num_simulcast_streams; ++i) {
     CodecSpecificInfo specifics;
     memset(&specifics, 0, sizeof(specifics));
     specifics.codecType = kVideoCodecGeneric;
     specifics.codecSpecific.generic.simulcast_idx = i;
     size_t min_stream_bits = static_cast<size_t>(
         (simulcast_streams[i].minBitrate * 1000) / framerate);
     size_t max_stream_bits = static_cast<size_t>(
         (simulcast_streams[i].maxBitrate * 1000) / framerate);
     size_t stream_bits = (bits_available > max_stream_bits) ? max_stream_bits :
         bits_available;
     size_t stream_bytes = (stream_bits + 7) / 8;
     if (keyframe) {
       // The first frame is a key frame and should be larger.
       // Store the overshoot bytes and distribute them over the coming frames,
       // so that we on average meet the bitrate target.
       debt_bytes_ += (kKeyframeSizeFactor - 1) * stream_bytes;
       stream_bytes *= kKeyframeSizeFactor;
     } else {
       if (debt_bytes_ > 0) {
         // Pay at most half of the frame size for old debts.
         size_t payment_size = std::min(stream_bytes / 2, debt_bytes_);
         debt_bytes_ -= payment_size;
         stream_bytes -= payment_size;
       }
     }

     if (stream_bytes > num_encoded_bytes)
       stream_bytes = num_encoded_bytes;

     // Always encode something on the first frame.
     if (min_stream_bits > bits_available && i > 0)
       continue;

     std::unique_ptr<uint8_t[]> encoded_buffer(new uint8_t[num_encoded_bytes]);
     memcpy(encoded_buffer.get(), encoded_buffer_, num_encoded_bytes);
     EncodedImage encoded(encoded_buffer.get(), stream_bytes, num_encoded_bytes);
     encoded._timeStamp = input_image.timestamp();
     encoded.capture_time_ms_ = input_image.render_time_ms();
     encoded._frameType = (*frame_types)[i];
     encoded._encodedWidth = simulcast_streams[i].width;
     encoded._encodedHeight = simulcast_streams[i].height;
     encoded.rotation_ = input_image.rotation();
     encoded.content_type_ = (mode == kScreensharing)
                                 ? VideoContentType::SCREENSHARE
                                 : VideoContentType::UNSPECIFIED;
     specifics.codec_name = ImplementationName();
     specifics.codecSpecific.generic.simulcast_idx = i;
     RTC_DCHECK(callback);
     if (callback->OnEncodedImage(encoded, &specifics, nullptr).error !=
         EncodedImageCallback::Result::OK) {
       return -1;
     }
     bits_available -= std::min(encoded._length * 8, bits_available);
   }
   return 0;
 }

 int32_t FakeEncoder::RegisterEncodeCompleteCallback(
     EncodedImageCallback* callback) {
   rtc::CritScope cs(&crit_sect_);
   callback_ = callback;
   return 0;
 }

 int32_t FakeEncoder::Release() { return 0; }

 int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int64_t rtt) {
   return 0;
 }

 int32_t FakeEncoder::SetRateAllocation(const BitrateAllocation& rate_allocation,
                                        uint32_t framerate) {
   rtc::CritScope cs(&crit_sect_);
   target_bitrate_ = rate_allocation;
   configured_input_framerate_ = framerate;
   return 0;
 }

 const char* FakeEncoder::kImplementationName = "fake_encoder";
 const char* FakeEncoder::ImplementationName() const {
   return kImplementationName;
 }

 int FakeEncoder::GetConfiguredInputFramerate() const {
   rtc::CritScope cs(&crit_sect_);
   return configured_input_framerate_;
 }

 FakeH264Encoder::FakeH264Encoder(Clock* clock)
     : FakeEncoder(clock), callback_(nullptr), idr_counter_(0) {
   FakeEncoder::RegisterEncodeCompleteCallback(this);
 }

 int32_t FakeH264Encoder::RegisterEncodeCompleteCallback(
     EncodedImageCallback* callback) {
   rtc::CritScope cs(&local_crit_sect_);
   callback_ = callback;
   return 0;
 }

 EncodedImageCallback::Result FakeH264Encoder::OnEncodedImage(
     const EncodedImage& encoded_image,
     const CodecSpecificInfo* codec_specific_info,
     const RTPFragmentationHeader* fragments) {
   const size_t kSpsSize = 8;
   const size_t kPpsSize = 11;
   const int kIdrFrequency = 10;
   EncodedImageCallback* callback;
   int current_idr_counter;
   {
     rtc::CritScope cs(&local_crit_sect_);
     callback = callback_;
     current_idr_counter = idr_counter_;
     ++idr_counter_;
   }
   RTPFragmentationHeader fragmentation;
   if (current_idr_counter % kIdrFrequency == 0 &&
       encoded_image._length > kSpsSize + kPpsSize + 1) {
     const size_t kNumSlices = 3;
     fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
     fragmentation.fragmentationOffset[0] = 0;
     fragmentation.fragmentationLength[0] = kSpsSize;
     fragmentation.fragmentationOffset[1] = kSpsSize;
     fragmentation.fragmentationLength[1] = kPpsSize;
     fragmentation.fragmentationOffset[2] = kSpsSize + kPpsSize;
     fragmentation.fragmentationLength[2] =
         encoded_image._length - (kSpsSize + kPpsSize);
     const size_t kSpsNalHeader = 0x67;
     const size_t kPpsNalHeader = 0x68;
     const size_t kIdrNalHeader = 0x65;
     encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kSpsNalHeader;
     encoded_image._buffer[fragmentation.fragmentationOffset[1]] = kPpsNalHeader;
     encoded_image._buffer[fragmentation.fragmentationOffset[2]] = kIdrNalHeader;
   } else {
     const size_t kNumSlices = 1;
     fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
     fragmentation.fragmentationOffset[0] = 0;
     fragmentation.fragmentationLength[0] = encoded_image._length;
     const size_t kNalHeader = 0x41;
     encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kNalHeader;
   }
   uint8_t value = 0;
   int fragment_counter = 0;
   for (size_t i = 0; i < encoded_image._length; ++i) {
     if (fragment_counter == fragmentation.fragmentationVectorSize ||
         i != fragmentation.fragmentationOffset[fragment_counter]) {
       encoded_image._buffer[i] = value++;
     } else {
       ++fragment_counter;
     }
   }
   CodecSpecificInfo specifics;
   memset(&specifics, 0, sizeof(specifics));
   specifics.codecType = kVideoCodecH264;
   specifics.codecSpecific.H264.packetization_mode =
       H264PacketizationMode::NonInterleaved;
   RTC_DCHECK(callback);
   return callback->OnEncodedImage(encoded_image, &specifics, &fragmentation);
 }

 DelayedEncoder::DelayedEncoder(Clock* clock, int delay_ms)
     : test::FakeEncoder(clock), delay_ms_(delay_ms) {
   // The encoder could be created on a different thread than
   // it is being used on.
   sequence_checker_.Detach();
 }

 void DelayedEncoder::SetDelay(int delay_ms) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);
   delay_ms_ = delay_ms;
 }

 int32_t DelayedEncoder::Encode(const VideoFrame& input_image,
                                const CodecSpecificInfo* codec_specific_info,
                                const std::vector<FrameType>* frame_types) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

   SleepMs(delay_ms_);

   return FakeEncoder::Encode(input_image, codec_specific_info, frame_types);
 }

 MultithreadedFakeH264Encoder::MultithreadedFakeH264Encoder(Clock* clock)
     : test::FakeH264Encoder(clock),
       current_queue_(0),
       queue1_(nullptr),
       queue2_(nullptr) {
   // The encoder could be created on a different thread than
   // it is being used on.
   sequence_checker_.Detach();
 }

 int32_t MultithreadedFakeH264Encoder::InitEncode(const VideoCodec* config,
                                                  int32_t number_of_cores,
                                                  size_t max_payload_size) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

   queue1_.reset(new rtc::TaskQueue("Queue 1"));
   queue2_.reset(new rtc::TaskQueue("Queue 2"));

   return FakeH264Encoder::InitEncode(config, number_of_cores, max_payload_size);
 }

 class MultithreadedFakeH264Encoder::EncodeTask : public rtc::QueuedTask {
  public:
   EncodeTask(MultithreadedFakeH264Encoder* encoder,
              const VideoFrame& input_image,
              const CodecSpecificInfo* codec_specific_info,
              const std::vector<FrameType>* frame_types)
       : encoder_(encoder),
         input_image_(input_image),
         codec_specific_info_(),
         frame_types_(*frame_types) {
     if (codec_specific_info)
       codec_specific_info_ = *codec_specific_info;
   }

  private:
   bool Run() override {
     encoder_->EncodeCallback(input_image_, &codec_specific_info_,
                              &frame_types_);
     return true;
   }

   MultithreadedFakeH264Encoder* const encoder_;
   VideoFrame input_image_;
   CodecSpecificInfo codec_specific_info_;
   std::vector<FrameType> frame_types_;
 };

 int32_t MultithreadedFakeH264Encoder::Encode(
     const VideoFrame& input_image,
     const CodecSpecificInfo* codec_specific_info,
     const std::vector<FrameType>* frame_types) {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

   std::unique_ptr<rtc::TaskQueue>& queue =
       (current_queue_++ % 2 == 0) ? queue1_ : queue2_;

   if (!queue) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }

   queue->PostTask(std::unique_ptr<rtc::QueuedTask>(
       new EncodeTask(this, input_image, codec_specific_info, frame_types)));

   return WEBRTC_VIDEO_CODEC_OK;
 }

 int32_t MultithreadedFakeH264Encoder::EncodeCallback(
     const VideoFrame& input_image,
     const CodecSpecificInfo* codec_specific_info,
     const std::vector<FrameType>* frame_types) {
   return FakeH264Encoder::Encode(input_image, codec_specific_info, frame_types);
 }

 int32_t MultithreadedFakeH264Encoder::Release() {
   RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

   queue1_.reset();
   queue2_.reset();

   return FakeH264Encoder::Release();
 }

 }  // namespace test
 }  // namespace webrtc
	/*
	* Copyright (c) 2013 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 "webrtc/test/fake_encoder.h"

	#include <string.h>

	#include <algorithm>
	#include <memory>

	#include "webrtc/common_types.h"
	#include "webrtc/modules/video_coding/include/video_codec_interface.h"
	#include "webrtc/rtc_base/checks.h"
	#include "webrtc/system_wrappers/include/sleep.h"
	#include "webrtc/test/gtest.h"

	namespace webrtc {
	namespace test {

	const int kKeyframeSizeFactor = 10;

	FakeEncoder::FakeEncoder(Clock* clock)
	: clock_(clock),
	callback_(nullptr),
	configured_input_framerate_(-1),
	max_target_bitrate_kbps_(-1),
	pending_keyframe_(true),
	debt_bytes_(0) {
	// Generate some arbitrary not-all-zero data
	for (size_t i = 0; i < sizeof(encoded_buffer_); ++i) {
	encoded_buffer_[i] = static_cast<uint8_t>(i);
	}
	}

	void FakeEncoder::SetMaxBitrate(int max_kbps) {
	RTC_DCHECK_GE(max_kbps, -1); // max_kbps == -1 disables it.
	rtc::CritScope cs(&crit_sect_);
	max_target_bitrate_kbps_ = max_kbps;
	}

	int32_t FakeEncoder::InitEncode(const VideoCodec* config,
	int32_t number_of_cores,
	size_t max_payload_size) {
	rtc::CritScope cs(&crit_sect_);
	config_ = *config;
	target_bitrate_.SetBitrate(0, 0, config_.startBitrate * 1000);
	configured_input_framerate_ = config_.maxFramerate;
	pending_keyframe_ = true;
	return 0;
	}

	int32_t FakeEncoder::Encode(const VideoFrame& input_image,
	const CodecSpecificInfo* codec_specific_info,
	const std::vector<FrameType>* frame_types) {
	unsigned char max_framerate;
	unsigned char num_simulcast_streams;
	SimulcastStream simulcast_streams[kMaxSimulcastStreams];
	EncodedImageCallback* callback;
	uint32_t target_bitrate_sum_kbps;
	int max_target_bitrate_kbps;
	size_t num_encoded_bytes;
	int framerate;
	VideoCodecMode mode;
	bool keyframe;
	{
	rtc::CritScope cs(&crit_sect_);
	max_framerate = config_.maxFramerate;
	num_simulcast_streams = config_.numberOfSimulcastStreams;
	for (int i = 0; i < num_simulcast_streams; ++i) {
	simulcast_streams[i] = config_.simulcastStream[i];
	}
	callback = callback_;
	target_bitrate_sum_kbps = target_bitrate_.get_sum_kbps();
	max_target_bitrate_kbps = max_target_bitrate_kbps_;
	num_encoded_bytes = sizeof(encoded_buffer_);
	mode = config_.mode;
	if (configured_input_framerate_ > 0) {
	framerate = configured_input_framerate_;
	} else {
	framerate = max_framerate;
	}
	keyframe = pending_keyframe_;
	pending_keyframe_ = false;
	}

	for (FrameType frame_type : *frame_types) {
	if (frame_type == kVideoFrameKey) {
	keyframe = true;
	break;
	}
	}

	RTC_DCHECK_GT(max_framerate, 0);

	size_t bitrate =
	std::max(target_bitrate_sum_kbps, simulcast_streams[0].minBitrate);
	if (max_target_bitrate_kbps > 0)
	bitrate = std::min(bitrate, static_cast<size_t>(max_target_bitrate_kbps));

	size_t bits_available = bitrate * 1000 / framerate;

	RTC_DCHECK_GT(num_simulcast_streams, 0);
	for (unsigned char i = 0; i < num_simulcast_streams; ++i) {
	CodecSpecificInfo specifics;
	memset(&specifics, 0, sizeof(specifics));
	specifics.codecType = kVideoCodecGeneric;
	specifics.codecSpecific.generic.simulcast_idx = i;
	size_t min_stream_bits = static_cast<size_t>(
	(simulcast_streams[i].minBitrate * 1000) / framerate);
	size_t max_stream_bits = static_cast<size_t>(
	(simulcast_streams[i].maxBitrate * 1000) / framerate);
	size_t stream_bits = (bits_available > max_stream_bits) ? max_stream_bits :
	bits_available;
	size_t stream_bytes = (stream_bits + 7) / 8;
	if (keyframe) {
	// The first frame is a key frame and should be larger.
	// Store the overshoot bytes and distribute them over the coming frames,
	// so that we on average meet the bitrate target.
	debt_bytes_ += (kKeyframeSizeFactor - 1) * stream_bytes;
	stream_bytes *= kKeyframeSizeFactor;
	} else {
	if (debt_bytes_ > 0) {
	// Pay at most half of the frame size for old debts.
	size_t payment_size = std::min(stream_bytes / 2, debt_bytes_);
	debt_bytes_ -= payment_size;
	stream_bytes -= payment_size;
	}
	}

	if (stream_bytes > num_encoded_bytes)
	stream_bytes = num_encoded_bytes;

	// Always encode something on the first frame.
	if (min_stream_bits > bits_available && i > 0)
	continue;

	std::unique_ptr<uint8_t[]> encoded_buffer(new uint8_t[num_encoded_bytes]);
	memcpy(encoded_buffer.get(), encoded_buffer_, num_encoded_bytes);
	EncodedImage encoded(encoded_buffer.get(), stream_bytes, num_encoded_bytes);
	encoded._timeStamp = input_image.timestamp();
	encoded.capture_time_ms_ = input_image.render_time_ms();
	encoded._frameType = (*frame_types)[i];
	encoded._encodedWidth = simulcast_streams[i].width;
	encoded._encodedHeight = simulcast_streams[i].height;
	encoded.rotation_ = input_image.rotation();
	encoded.content_type_ = (mode == kScreensharing)
	? VideoContentType::SCREENSHARE
	: VideoContentType::UNSPECIFIED;
	specifics.codec_name = ImplementationName();
	specifics.codecSpecific.generic.simulcast_idx = i;
	RTC_DCHECK(callback);
	if (callback->OnEncodedImage(encoded, &specifics, nullptr).error !=
	EncodedImageCallback::Result::OK) {
	return -1;
	}
	bits_available -= std::min(encoded._length * 8, bits_available);
	}
	return 0;
	}

	int32_t FakeEncoder::RegisterEncodeCompleteCallback(
	EncodedImageCallback* callback) {
	rtc::CritScope cs(&crit_sect_);
	callback_ = callback;
	return 0;
	}

	int32_t FakeEncoder::Release() { return 0; }

	int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int64_t rtt) {
	return 0;
	}

	int32_t FakeEncoder::SetRateAllocation(const BitrateAllocation& rate_allocation,
	uint32_t framerate) {
	rtc::CritScope cs(&crit_sect_);
	target_bitrate_ = rate_allocation;
	configured_input_framerate_ = framerate;
	return 0;
	}

	const char* FakeEncoder::kImplementationName = "fake_encoder";
	const char* FakeEncoder::ImplementationName() const {
	return kImplementationName;
	}

	int FakeEncoder::GetConfiguredInputFramerate() const {
	rtc::CritScope cs(&crit_sect_);
	return configured_input_framerate_;
	}

	FakeH264Encoder::FakeH264Encoder(Clock* clock)
	: FakeEncoder(clock), callback_(nullptr), idr_counter_(0) {
	FakeEncoder::RegisterEncodeCompleteCallback(this);
	}

	int32_t FakeH264Encoder::RegisterEncodeCompleteCallback(
	EncodedImageCallback* callback) {
	rtc::CritScope cs(&local_crit_sect_);
	callback_ = callback;
	return 0;
	}

	EncodedImageCallback::Result FakeH264Encoder::OnEncodedImage(
	const EncodedImage& encoded_image,
	const CodecSpecificInfo* codec_specific_info,
	const RTPFragmentationHeader* fragments) {
	const size_t kSpsSize = 8;
	const size_t kPpsSize = 11;
	const int kIdrFrequency = 10;
	EncodedImageCallback* callback;
	int current_idr_counter;
	{
	rtc::CritScope cs(&local_crit_sect_);
	callback = callback_;
	current_idr_counter = idr_counter_;
	++idr_counter_;
	}
	RTPFragmentationHeader fragmentation;
	if (current_idr_counter % kIdrFrequency == 0 &&
	encoded_image._length > kSpsSize + kPpsSize + 1) {
	const size_t kNumSlices = 3;
	fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
	fragmentation.fragmentationOffset[0] = 0;
	fragmentation.fragmentationLength[0] = kSpsSize;
	fragmentation.fragmentationOffset[1] = kSpsSize;
	fragmentation.fragmentationLength[1] = kPpsSize;
	fragmentation.fragmentationOffset[2] = kSpsSize + kPpsSize;
	fragmentation.fragmentationLength[2] =
	encoded_image._length - (kSpsSize + kPpsSize);
	const size_t kSpsNalHeader = 0x67;
	const size_t kPpsNalHeader = 0x68;
	const size_t kIdrNalHeader = 0x65;
	encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kSpsNalHeader;
	encoded_image._buffer[fragmentation.fragmentationOffset[1]] = kPpsNalHeader;
	encoded_image._buffer[fragmentation.fragmentationOffset[2]] = kIdrNalHeader;
	} else {
	const size_t kNumSlices = 1;
	fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
	fragmentation.fragmentationOffset[0] = 0;
	fragmentation.fragmentationLength[0] = encoded_image._length;
	const size_t kNalHeader = 0x41;
	encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kNalHeader;
	}
	uint8_t value = 0;
	int fragment_counter = 0;
	for (size_t i = 0; i < encoded_image._length; ++i) {
	if (fragment_counter == fragmentation.fragmentationVectorSize \|\|
	i != fragmentation.fragmentationOffset[fragment_counter]) {
	encoded_image._buffer[i] = value++;
	} else {
	++fragment_counter;
	}
	}
	CodecSpecificInfo specifics;
	memset(&specifics, 0, sizeof(specifics));
	specifics.codecType = kVideoCodecH264;
	specifics.codecSpecific.H264.packetization_mode =
	H264PacketizationMode::NonInterleaved;
	RTC_DCHECK(callback);
	return callback->OnEncodedImage(encoded_image, &specifics, &fragmentation);
	}

	DelayedEncoder::DelayedEncoder(Clock* clock, int delay_ms)
	: test::FakeEncoder(clock), delay_ms_(delay_ms) {
	// The encoder could be created on a different thread than
	// it is being used on.
	sequence_checker_.Detach();
	}

	void DelayedEncoder::SetDelay(int delay_ms) {
	RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);
	delay_ms_ = delay_ms;
	}

	int32_t DelayedEncoder::Encode(const VideoFrame& input_image,
	const CodecSpecificInfo* codec_specific_info,
	const std::vector<FrameType>* frame_types) {
	RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

	SleepMs(delay_ms_);

	return FakeEncoder::Encode(input_image, codec_specific_info, frame_types);
	}

	MultithreadedFakeH264Encoder::MultithreadedFakeH264Encoder(Clock* clock)
	: test::FakeH264Encoder(clock),
	current_queue_(0),
	queue1_(nullptr),
	queue2_(nullptr) {
	// The encoder could be created on a different thread than
	// it is being used on.
	sequence_checker_.Detach();
	}

	int32_t MultithreadedFakeH264Encoder::InitEncode(const VideoCodec* config,
	int32_t number_of_cores,
	size_t max_payload_size) {
	RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

	queue1_.reset(new rtc::TaskQueue("Queue 1"));
	queue2_.reset(new rtc::TaskQueue("Queue 2"));

	return FakeH264Encoder::InitEncode(config, number_of_cores, max_payload_size);
	}

	class MultithreadedFakeH264Encoder::EncodeTask : public rtc::QueuedTask {
	public:
	EncodeTask(MultithreadedFakeH264Encoder* encoder,
	const VideoFrame& input_image,
	const CodecSpecificInfo* codec_specific_info,
	const std::vector<FrameType>* frame_types)
	: encoder_(encoder),
	input_image_(input_image),
	codec_specific_info_(),
	frame_types_(*frame_types) {
	if (codec_specific_info)
	codec_specific_info_ = *codec_specific_info;
	}

	private:
	bool Run() override {
	encoder_->EncodeCallback(input_image_, &codec_specific_info_,
	&frame_types_);
	return true;
	}

	MultithreadedFakeH264Encoder* const encoder_;
	VideoFrame input_image_;
	CodecSpecificInfo codec_specific_info_;
	std::vector<FrameType> frame_types_;
	};

	int32_t MultithreadedFakeH264Encoder::Encode(
	const VideoFrame& input_image,
	const CodecSpecificInfo* codec_specific_info,
	const std::vector<FrameType>* frame_types) {
	RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

	std::unique_ptr<rtc::TaskQueue>& queue =
	(current_queue_++ % 2 == 0) ? queue1_ : queue2_;

	if (!queue) {
	return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
	}

	queue->PostTask(std::unique_ptr<rtc::QueuedTask>(
	new EncodeTask(this, input_image, codec_specific_info, frame_types)));

	return WEBRTC_VIDEO_CODEC_OK;
	}

	int32_t MultithreadedFakeH264Encoder::EncodeCallback(
	const VideoFrame& input_image,
	const CodecSpecificInfo* codec_specific_info,
	const std::vector<FrameType>* frame_types) {
	return FakeH264Encoder::Encode(input_image, codec_specific_info, frame_types);
	}

	int32_t MultithreadedFakeH264Encoder::Release() {
	RTC_DCHECK_CALLED_SEQUENTIALLY(&sequence_checker_);

	queue1_.reset();
	queue2_.reset();

	return FakeH264Encoder::Release();
	}

	} // namespace test
	} // namespace webrtc