webrtc/modules/video_coding/codecs/test/videoprocessor.cc - src - Git at Google

 /*
  *  Copyright (c) 2012 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/modules/video_coding/codecs/test/videoprocessor.h"

 #include <string.h>

 #include <limits>
 #include <memory>
 #include <utility>
 #include <vector>

 #include "webrtc/api/video/i420_buffer.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/timeutils.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/video_coding/include/video_codec_initializer.h"
 #include "webrtc/modules/video_coding/utility/default_video_bitrate_allocator.h"
 #include "webrtc/modules/video_coding/utility/simulcast_rate_allocator.h"
 #include "webrtc/system_wrappers/include/cpu_info.h"

 namespace webrtc {
 namespace test {

 namespace {
 const int k90khzTimestampFrameDiff = 3000;  // Assuming 30 fps.
 }  // namespace

 const char* ExcludeFrameTypesToStr(ExcludeFrameTypes e) {
   switch (e) {
     case kExcludeOnlyFirstKeyFrame:
       return "ExcludeOnlyFirstKeyFrame";
     case kExcludeAllKeyFrames:
       return "ExcludeAllKeyFrames";
     default:
       RTC_NOTREACHED();
       return "Unknown";
   }
 }

 TestConfig::TestConfig()
     : name(""),
       description(""),
       test_number(0),
       input_filename(""),
       output_filename(""),
       output_dir("out"),
       networking_config(),
       exclude_frame_types(kExcludeOnlyFirstKeyFrame),
       frame_length_in_bytes(0),
       use_single_core(false),
       keyframe_interval(0),
       codec_settings(nullptr),
       verbose(true) {}

 TestConfig::~TestConfig() {}

 VideoProcessorImpl::VideoProcessorImpl(webrtc::VideoEncoder* encoder,
                                        webrtc::VideoDecoder* decoder,
                                        FrameReader* analysis_frame_reader,
                                        FrameWriter* analysis_frame_writer,
                                        PacketManipulator* packet_manipulator,
                                        const TestConfig& config,
                                        Stats* stats,
                                        FrameWriter* source_frame_writer,
                                        IvfFileWriter* encoded_frame_writer,
                                        FrameWriter* decoded_frame_writer)
     : encoder_(encoder),
       decoder_(decoder),
       analysis_frame_reader_(analysis_frame_reader),
       analysis_frame_writer_(analysis_frame_writer),
       packet_manipulator_(packet_manipulator),
       config_(config),
       stats_(stats),
       source_frame_writer_(source_frame_writer),
       encoded_frame_writer_(encoded_frame_writer),
       decoded_frame_writer_(decoded_frame_writer),
       first_key_frame_has_been_excluded_(false),
       last_frame_missing_(false),
       initialized_(false),
       encoded_frame_size_(0),
       encoded_frame_type_(kVideoFrameKey),
       prev_time_stamp_(0),
       num_dropped_frames_(0),
       num_spatial_resizes_(0),
       last_encoder_frame_width_(0),
       last_encoder_frame_height_(0),
       bit_rate_factor_(0.0),
       encode_start_ns_(0),
       decode_start_ns_(0) {
   std::unique_ptr<TemporalLayersFactory> tl_factory;
   if (config_.codec_settings->codecType == VideoCodecType::kVideoCodecVP8) {
     tl_factory.reset(new TemporalLayersFactory());
     config.codec_settings->VP8()->tl_factory = tl_factory.get();
   }
   bitrate_allocator_ = VideoCodecInitializer::CreateBitrateAllocator(
       *config.codec_settings, std::move(tl_factory));
   RTC_DCHECK(encoder);
   RTC_DCHECK(decoder);
   RTC_DCHECK(analysis_frame_reader);
   RTC_DCHECK(analysis_frame_writer);
   RTC_DCHECK(packet_manipulator);
   RTC_DCHECK(stats);
 }

 bool VideoProcessorImpl::Init() {
   // Calculate a factor used for bit rate calculations.
   bit_rate_factor_ = config_.codec_settings->maxFramerate * 0.001 * 8;  // bits

   // Initialize data structures used by the encoder/decoder APIs.
   size_t frame_length_in_bytes = analysis_frame_reader_->FrameLength();
   last_successful_frame_buffer_.reset(new uint8_t[frame_length_in_bytes]);

   // Set fixed properties common for all frames.
   // To keep track of spatial resize actions by encoder.
   last_encoder_frame_width_ = config_.codec_settings->width;
   last_encoder_frame_height_ = config_.codec_settings->height;

   // Setup required callbacks for the encoder/decoder.
   encode_callback_.reset(new VideoProcessorEncodeCompleteCallback(this));
   decode_callback_.reset(new VideoProcessorDecodeCompleteCallback(this));
   RTC_CHECK_EQ(encoder_->RegisterEncodeCompleteCallback(encode_callback_.get()),
                WEBRTC_VIDEO_CODEC_OK)
       << "Failed to register encode complete callback";
   RTC_CHECK_EQ(decoder_->RegisterDecodeCompleteCallback(decode_callback_.get()),
                WEBRTC_VIDEO_CODEC_OK)
       << "Failed to register decode complete callback";

   // Init the encoder and decoder.
   uint32_t num_cores =
       config_.use_single_core ? 1 : CpuInfo::DetectNumberOfCores();
   RTC_CHECK_EQ(
       encoder_->InitEncode(config_.codec_settings, num_cores,
                            config_.networking_config.max_payload_size_in_bytes),
       WEBRTC_VIDEO_CODEC_OK)
       << "Failed to initialize VideoEncoder";

   RTC_CHECK_EQ(decoder_->InitDecode(config_.codec_settings, num_cores),
                WEBRTC_VIDEO_CODEC_OK)
       << "Failed to initialize VideoDecoder";

   if (config_.verbose) {
     printf("Video Processor:\n");
     printf("  #CPU cores used  : %d\n", num_cores);
     printf("  Total # of frames: %d\n",
            analysis_frame_reader_->NumberOfFrames());
     printf("  Codec settings:\n");
     printf("    Start bitrate    : %d kbps\n",
            config_.codec_settings->startBitrate);
     printf("    Width            : %d\n", config_.codec_settings->width);
     printf("    Height           : %d\n", config_.codec_settings->height);
     printf("    Codec type       : %s\n",
            CodecTypeToPayloadName(config_.codec_settings->codecType)
                .value_or("Unknown"));
     printf("    Encoder implementation name: %s\n",
            encoder_->ImplementationName());
     printf("    Decoder implementation name: %s\n",
            decoder_->ImplementationName());
     if (config_.codec_settings->codecType == kVideoCodecVP8) {
       printf("    Denoising        : %d\n",
              config_.codec_settings->VP8()->denoisingOn);
       printf("    Error concealment: %d\n",
              config_.codec_settings->VP8()->errorConcealmentOn);
       printf("    Frame dropping   : %d\n",
              config_.codec_settings->VP8()->frameDroppingOn);
       printf("    Resilience       : %d\n",
              config_.codec_settings->VP8()->resilience);
     } else if (config_.codec_settings->codecType == kVideoCodecVP9) {
       printf("    Resilience       : %d\n",
              config_.codec_settings->VP9()->resilience);
     }
   }
   initialized_ = true;
   return true;
 }

 VideoProcessorImpl::~VideoProcessorImpl() {
   encoder_->RegisterEncodeCompleteCallback(nullptr);
   decoder_->RegisterDecodeCompleteCallback(nullptr);
 }

 void VideoProcessorImpl::SetRates(int bit_rate, int frame_rate) {
   int set_rates_result = encoder_->SetRateAllocation(
       bitrate_allocator_->GetAllocation(bit_rate * 1000, frame_rate),
       frame_rate);
   RTC_CHECK_GE(set_rates_result, 0) << "Failed to update encoder with new rate "
                                     << bit_rate;
   num_dropped_frames_ = 0;
   num_spatial_resizes_ = 0;
 }

 size_t VideoProcessorImpl::EncodedFrameSize() {
   return encoded_frame_size_;
 }

 FrameType VideoProcessorImpl::EncodedFrameType() {
   return encoded_frame_type_;
 }

 int VideoProcessorImpl::NumberDroppedFrames() {
   return num_dropped_frames_;
 }

 int VideoProcessorImpl::NumberSpatialResizes() {
   return num_spatial_resizes_;
 }

 bool VideoProcessorImpl::ProcessFrame(int frame_number) {
   RTC_CHECK_GE(frame_number, 0);
   RTC_CHECK(initialized_) << "Attempting to use uninitialized VideoProcessor";

   rtc::scoped_refptr<VideoFrameBuffer> buffer(
       analysis_frame_reader_->ReadFrame());
   if (buffer) {
     if (source_frame_writer_) {
       // TODO(brandtr): Introduce temp buffer as data member, to avoid
       // allocating for every frame.
       size_t length = CalcBufferSize(kI420, buffer->width(), buffer->height());
       std::unique_ptr<uint8_t[]> extracted_buffer(new uint8_t[length]);
       int extracted_length =
           ExtractBuffer(buffer, length, extracted_buffer.get());
       RTC_CHECK_EQ(extracted_length, source_frame_writer_->FrameLength());
       source_frame_writer_->WriteFrame(extracted_buffer.get());
     }

     // Use the frame number as basis for timestamp to identify frames. Let the
     // first timestamp be non-zero, to not make the IvfFileWriter believe that
     // we want to use capture timestamps in the IVF files.
     VideoFrame source_frame(buffer,
                             (frame_number + 1) * k90khzTimestampFrameDiff, 0,
                             webrtc::kVideoRotation_0);

     // Ensure we have a new statistics data object we can fill.
     FrameStatistic& stat = stats_->NewFrame(frame_number);

     // Decide if we are going to force a keyframe.
     std::vector<FrameType> frame_types(1, kVideoFrameDelta);
     if (config_.keyframe_interval > 0 &&
         frame_number % config_.keyframe_interval == 0) {
       frame_types[0] = kVideoFrameKey;
     }

     // For dropped frames, we regard them as zero size encoded frames.
     encoded_frame_size_ = 0;
     encoded_frame_type_ = kVideoFrameDelta;

     // For the highest measurement accuracy of the encode time, the start/stop
     // time recordings should wrap the Encode call as tightly as possible.
     encode_start_ns_ = rtc::TimeNanos();
     int32_t encode_result =
         encoder_->Encode(source_frame, nullptr, &frame_types);

     if (encode_result != WEBRTC_VIDEO_CODEC_OK) {
       fprintf(stderr, "Failed to encode frame %d, return code: %d\n",
               frame_number, encode_result);
     }
     stat.encode_return_code = encode_result;

     return true;
   } else {
     // Last frame has been reached.
     return false;
   }
 }

 void VideoProcessorImpl::FrameEncoded(
     webrtc::VideoCodecType codec,
     const EncodedImage& encoded_image,
     const webrtc::RTPFragmentationHeader* fragmentation) {
   // For the highest measurement accuracy of the encode time, the start/stop
   // time recordings should wrap the Encode call as tightly as possible.
   int64_t encode_stop_ns = rtc::TimeNanos();

   if (encoded_frame_writer_) {
     RTC_CHECK(encoded_frame_writer_->WriteFrame(encoded_image, codec));
   }

   // Timestamp is proportional to frame number, so this gives us number of
   // dropped frames.
   int num_dropped_from_prev_encode =
       (encoded_image._timeStamp - prev_time_stamp_) / k90khzTimestampFrameDiff -
       1;
   num_dropped_frames_ += num_dropped_from_prev_encode;
   prev_time_stamp_ = encoded_image._timeStamp;
   if (num_dropped_from_prev_encode > 0) {
     // For dropped frames, we write out the last decoded frame to avoid getting
     // out of sync for the computation of PSNR and SSIM.
     for (int i = 0; i < num_dropped_from_prev_encode; i++) {
       RTC_CHECK(analysis_frame_writer_->WriteFrame(
           last_successful_frame_buffer_.get()));
       if (decoded_frame_writer_) {
         RTC_CHECK(decoded_frame_writer_->WriteFrame(
             last_successful_frame_buffer_.get()));
       }
     }
   }

   // Frame is not dropped, so update the encoded frame size
   // (encoder callback is only called for non-zero length frames).
   encoded_frame_size_ = encoded_image._length;
   encoded_frame_type_ = encoded_image._frameType;
   int frame_number = encoded_image._timeStamp / k90khzTimestampFrameDiff - 1;
   FrameStatistic& stat = stats_->stats_[frame_number];
   stat.encode_time_in_us =
       GetElapsedTimeMicroseconds(encode_start_ns_, encode_stop_ns);
   stat.encoding_successful = true;
   stat.encoded_frame_length_in_bytes = encoded_image._length;
   stat.frame_number = frame_number;
   stat.frame_type = encoded_image._frameType;
   stat.bit_rate_in_kbps = encoded_image._length * bit_rate_factor_;
   stat.total_packets =
       encoded_image._length / config_.networking_config.packet_size_in_bytes +
       1;

   // Simulate packet loss.
   bool exclude_this_frame = false;
   // Only keyframes can be excluded.
   if (encoded_image._frameType == kVideoFrameKey) {
     switch (config_.exclude_frame_types) {
       case kExcludeOnlyFirstKeyFrame:
         if (!first_key_frame_has_been_excluded_) {
           first_key_frame_has_been_excluded_ = true;
           exclude_this_frame = true;
         }
         break;
       case kExcludeAllKeyFrames:
         exclude_this_frame = true;
         break;
       default:
         RTC_NOTREACHED();
     }
   }

   // Make a raw copy of the |encoded_image| buffer.
   size_t copied_buffer_size = encoded_image._length +
                               EncodedImage::GetBufferPaddingBytes(codec);
   std::unique_ptr<uint8_t[]> copied_buffer(new uint8_t[copied_buffer_size]);
   memcpy(copied_buffer.get(), encoded_image._buffer, encoded_image._length);
   // The image to feed to the decoder.
   EncodedImage copied_image;
   memcpy(&copied_image, &encoded_image, sizeof(copied_image));
   copied_image._size = copied_buffer_size;
   copied_image._buffer = copied_buffer.get();

   if (!exclude_this_frame) {
     stat.packets_dropped =
         packet_manipulator_->ManipulatePackets(&copied_image);
   }

   // Keep track of if frames are lost due to packet loss so we can tell
   // this to the encoder (this is handled by the RTP logic in the full stack).
   // TODO(kjellander): Pass fragmentation header to the decoder when
   // CL 172001 has been submitted and PacketManipulator supports this.

   // For the highest measurement accuracy of the decode time, the start/stop
   // time recordings should wrap the Decode call as tightly as possible.
   decode_start_ns_ = rtc::TimeNanos();
   int32_t decode_result =
       decoder_->Decode(copied_image, last_frame_missing_, nullptr);
   stat.decode_return_code = decode_result;

   if (decode_result != WEBRTC_VIDEO_CODEC_OK) {
     // Write the last successful frame the output file to avoid getting it out
     // of sync with the source file for SSIM and PSNR comparisons.
     RTC_CHECK(analysis_frame_writer_->WriteFrame(
         last_successful_frame_buffer_.get()));
     if (decoded_frame_writer_) {
       RTC_CHECK(decoded_frame_writer_->WriteFrame(
           last_successful_frame_buffer_.get()));
     }
   }

   // Save status for losses so we can inform the decoder for the next frame.
   last_frame_missing_ = copied_image._length == 0;
 }

 void VideoProcessorImpl::FrameDecoded(const VideoFrame& image) {
   // For the highest measurement accuracy of the decode time, the start/stop
   // time recordings should wrap the Decode call as tightly as possible.
   int64_t decode_stop_ns = rtc::TimeNanos();

   // Report stats.
   int frame_number = image.timestamp() / k90khzTimestampFrameDiff - 1;
   FrameStatistic& stat = stats_->stats_[frame_number];
   stat.decode_time_in_us =
       GetElapsedTimeMicroseconds(decode_start_ns_, decode_stop_ns);
   stat.decoding_successful = true;

   // Check for resize action (either down or up).
   if (static_cast<int>(image.width()) != last_encoder_frame_width_ ||
       static_cast<int>(image.height()) != last_encoder_frame_height_) {
     ++num_spatial_resizes_;
     last_encoder_frame_width_ = image.width();
     last_encoder_frame_height_ = image.height();
   }
   // Check if codec size is different from native/original size, and if so,
   // upsample back to original size. This is needed for PSNR and SSIM
   // calculations.
   if (image.width() != config_.codec_settings->width ||
       image.height() != config_.codec_settings->height) {
     rtc::scoped_refptr<I420Buffer> up_image(
         I420Buffer::Create(config_.codec_settings->width,
                            config_.codec_settings->height));

     // Should be the same aspect ratio, no cropping needed.
     if (image.video_frame_buffer()->native_handle()) {
       up_image->ScaleFrom(*image.video_frame_buffer()->NativeToI420Buffer());
     } else {
       up_image->ScaleFrom(*image.video_frame_buffer());
     }

     // TODO(mikhal): Extracting the buffer for now - need to update test.
     size_t length =
         CalcBufferSize(kI420, up_image->width(), up_image->height());
     std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[length]);
     int extracted_length = ExtractBuffer(up_image, length, image_buffer.get());
     RTC_CHECK_GT(extracted_length, 0);
     // Update our copy of the last successful frame.
     memcpy(last_successful_frame_buffer_.get(), image_buffer.get(),
            extracted_length);

     RTC_CHECK(analysis_frame_writer_->WriteFrame(image_buffer.get()));
     if (decoded_frame_writer_) {
       RTC_CHECK(decoded_frame_writer_->WriteFrame(image_buffer.get()));
     }
   } else {  // No resize.
     // Update our copy of the last successful frame.
     // TODO(mikhal): Add as a member function, so won't be allocated per frame.
     size_t length = CalcBufferSize(kI420, image.width(), image.height());
     std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[length]);
     int extracted_length;
     if (image.video_frame_buffer()->native_handle()) {
       extracted_length =
           ExtractBuffer(image.video_frame_buffer()->NativeToI420Buffer(),
                         length, image_buffer.get());
     } else {
       extracted_length =
           ExtractBuffer(image.video_frame_buffer(), length, image_buffer.get());
     }
     RTC_CHECK_GT(extracted_length, 0);
     memcpy(last_successful_frame_buffer_.get(), image_buffer.get(),
            extracted_length);

     RTC_CHECK(analysis_frame_writer_->WriteFrame(image_buffer.get()));
     if (decoded_frame_writer_) {
       RTC_CHECK(decoded_frame_writer_->WriteFrame(image_buffer.get()));
     }
   }
 }

 int VideoProcessorImpl::GetElapsedTimeMicroseconds(int64_t start,
                                                    int64_t stop) {
   int64_t encode_time = (stop - start) / rtc::kNumNanosecsPerMicrosec;
   RTC_DCHECK_GE(encode_time, std::numeric_limits<int>::min());
   RTC_DCHECK_LE(encode_time, std::numeric_limits<int>::max());
   return static_cast<int>(encode_time);
 }

 }  // namespace test
 }  // namespace webrtc
	/*
	* Copyright (c) 2012 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/modules/video_coding/codecs/test/videoprocessor.h"

	#include <string.h>

	#include <limits>
	#include <memory>
	#include <utility>
	#include <vector>

	#include "webrtc/api/video/i420_buffer.h"
	#include "webrtc/base/checks.h"
	#include "webrtc/base/timeutils.h"
	#include "webrtc/common_types.h"
	#include "webrtc/modules/video_coding/include/video_codec_initializer.h"
	#include "webrtc/modules/video_coding/utility/default_video_bitrate_allocator.h"
	#include "webrtc/modules/video_coding/utility/simulcast_rate_allocator.h"
	#include "webrtc/system_wrappers/include/cpu_info.h"

	namespace webrtc {
	namespace test {

	namespace {
	const int k90khzTimestampFrameDiff = 3000; // Assuming 30 fps.
	} // namespace

	const char* ExcludeFrameTypesToStr(ExcludeFrameTypes e) {
	switch (e) {
	case kExcludeOnlyFirstKeyFrame:
	return "ExcludeOnlyFirstKeyFrame";
	case kExcludeAllKeyFrames:
	return "ExcludeAllKeyFrames";
	default:
	RTC_NOTREACHED();
	return "Unknown";
	}
	}

	TestConfig::TestConfig()
	: name(""),
	description(""),
	test_number(0),
	input_filename(""),
	output_filename(""),
	output_dir("out"),
	networking_config(),
	exclude_frame_types(kExcludeOnlyFirstKeyFrame),
	frame_length_in_bytes(0),
	use_single_core(false),
	keyframe_interval(0),
	codec_settings(nullptr),
	verbose(true) {}

	TestConfig::~TestConfig() {}

	VideoProcessorImpl::VideoProcessorImpl(webrtc::VideoEncoder* encoder,
	webrtc::VideoDecoder* decoder,
	FrameReader* analysis_frame_reader,
	FrameWriter* analysis_frame_writer,
	PacketManipulator* packet_manipulator,
	const TestConfig& config,
	Stats* stats,
	FrameWriter* source_frame_writer,
	IvfFileWriter* encoded_frame_writer,
	FrameWriter* decoded_frame_writer)
	: encoder_(encoder),
	decoder_(decoder),
	analysis_frame_reader_(analysis_frame_reader),
	analysis_frame_writer_(analysis_frame_writer),
	packet_manipulator_(packet_manipulator),
	config_(config),
	stats_(stats),
	source_frame_writer_(source_frame_writer),
	encoded_frame_writer_(encoded_frame_writer),
	decoded_frame_writer_(decoded_frame_writer),
	first_key_frame_has_been_excluded_(false),
	last_frame_missing_(false),
	initialized_(false),
	encoded_frame_size_(0),
	encoded_frame_type_(kVideoFrameKey),
	prev_time_stamp_(0),
	num_dropped_frames_(0),
	num_spatial_resizes_(0),
	last_encoder_frame_width_(0),
	last_encoder_frame_height_(0),
	bit_rate_factor_(0.0),
	encode_start_ns_(0),
	decode_start_ns_(0) {
	std::unique_ptr<TemporalLayersFactory> tl_factory;
	if (config_.codec_settings->codecType == VideoCodecType::kVideoCodecVP8) {
	tl_factory.reset(new TemporalLayersFactory());
	config.codec_settings->VP8()->tl_factory = tl_factory.get();
	}
	bitrate_allocator_ = VideoCodecInitializer::CreateBitrateAllocator(
	*config.codec_settings, std::move(tl_factory));
	RTC_DCHECK(encoder);
	RTC_DCHECK(decoder);
	RTC_DCHECK(analysis_frame_reader);
	RTC_DCHECK(analysis_frame_writer);
	RTC_DCHECK(packet_manipulator);
	RTC_DCHECK(stats);
	}

	bool VideoProcessorImpl::Init() {
	// Calculate a factor used for bit rate calculations.
	bit_rate_factor_ = config_.codec_settings->maxFramerate * 0.001 * 8; // bits

	// Initialize data structures used by the encoder/decoder APIs.
	size_t frame_length_in_bytes = analysis_frame_reader_->FrameLength();
	last_successful_frame_buffer_.reset(new uint8_t[frame_length_in_bytes]);

	// Set fixed properties common for all frames.
	// To keep track of spatial resize actions by encoder.
	last_encoder_frame_width_ = config_.codec_settings->width;
	last_encoder_frame_height_ = config_.codec_settings->height;

	// Setup required callbacks for the encoder/decoder.
	encode_callback_.reset(new VideoProcessorEncodeCompleteCallback(this));
	decode_callback_.reset(new VideoProcessorDecodeCompleteCallback(this));
	RTC_CHECK_EQ(encoder_->RegisterEncodeCompleteCallback(encode_callback_.get()),
	WEBRTC_VIDEO_CODEC_OK)
	<< "Failed to register encode complete callback";
	RTC_CHECK_EQ(decoder_->RegisterDecodeCompleteCallback(decode_callback_.get()),
	WEBRTC_VIDEO_CODEC_OK)
	<< "Failed to register decode complete callback";

	// Init the encoder and decoder.
	uint32_t num_cores =
	config_.use_single_core ? 1 : CpuInfo::DetectNumberOfCores();
	RTC_CHECK_EQ(
	encoder_->InitEncode(config_.codec_settings, num_cores,
	config_.networking_config.max_payload_size_in_bytes),
	WEBRTC_VIDEO_CODEC_OK)
	<< "Failed to initialize VideoEncoder";

	RTC_CHECK_EQ(decoder_->InitDecode(config_.codec_settings, num_cores),
	WEBRTC_VIDEO_CODEC_OK)
	<< "Failed to initialize VideoDecoder";

	if (config_.verbose) {
	printf("Video Processor:\n");
	printf(" #CPU cores used : %d\n", num_cores);
	printf(" Total # of frames: %d\n",
	analysis_frame_reader_->NumberOfFrames());
	printf(" Codec settings:\n");
	printf(" Start bitrate : %d kbps\n",
	config_.codec_settings->startBitrate);
	printf(" Width : %d\n", config_.codec_settings->width);
	printf(" Height : %d\n", config_.codec_settings->height);
	printf(" Codec type : %s\n",
	CodecTypeToPayloadName(config_.codec_settings->codecType)
	.value_or("Unknown"));
	printf(" Encoder implementation name: %s\n",
	encoder_->ImplementationName());
	printf(" Decoder implementation name: %s\n",
	decoder_->ImplementationName());
	if (config_.codec_settings->codecType == kVideoCodecVP8) {
	printf(" Denoising : %d\n",
	config_.codec_settings->VP8()->denoisingOn);
	printf(" Error concealment: %d\n",
	config_.codec_settings->VP8()->errorConcealmentOn);
	printf(" Frame dropping : %d\n",
	config_.codec_settings->VP8()->frameDroppingOn);
	printf(" Resilience : %d\n",
	config_.codec_settings->VP8()->resilience);
	} else if (config_.codec_settings->codecType == kVideoCodecVP9) {
	printf(" Resilience : %d\n",
	config_.codec_settings->VP9()->resilience);
	}
	}
	initialized_ = true;
	return true;
	}

	VideoProcessorImpl::~VideoProcessorImpl() {
	encoder_->RegisterEncodeCompleteCallback(nullptr);
	decoder_->RegisterDecodeCompleteCallback(nullptr);
	}

	void VideoProcessorImpl::SetRates(int bit_rate, int frame_rate) {
	int set_rates_result = encoder_->SetRateAllocation(
	bitrate_allocator_->GetAllocation(bit_rate * 1000, frame_rate),
	frame_rate);
	RTC_CHECK_GE(set_rates_result, 0) << "Failed to update encoder with new rate "
	<< bit_rate;
	num_dropped_frames_ = 0;
	num_spatial_resizes_ = 0;
	}

	size_t VideoProcessorImpl::EncodedFrameSize() {
	return encoded_frame_size_;
	}

	FrameType VideoProcessorImpl::EncodedFrameType() {
	return encoded_frame_type_;
	}

	int VideoProcessorImpl::NumberDroppedFrames() {
	return num_dropped_frames_;
	}

	int VideoProcessorImpl::NumberSpatialResizes() {
	return num_spatial_resizes_;
	}

	bool VideoProcessorImpl::ProcessFrame(int frame_number) {
	RTC_CHECK_GE(frame_number, 0);
	RTC_CHECK(initialized_) << "Attempting to use uninitialized VideoProcessor";

	rtc::scoped_refptr<VideoFrameBuffer> buffer(
	analysis_frame_reader_->ReadFrame());
	if (buffer) {
	if (source_frame_writer_) {
	// TODO(brandtr): Introduce temp buffer as data member, to avoid
	// allocating for every frame.
	size_t length = CalcBufferSize(kI420, buffer->width(), buffer->height());
	std::unique_ptr<uint8_t[]> extracted_buffer(new uint8_t[length]);
	int extracted_length =
	ExtractBuffer(buffer, length, extracted_buffer.get());
	RTC_CHECK_EQ(extracted_length, source_frame_writer_->FrameLength());
	source_frame_writer_->WriteFrame(extracted_buffer.get());
	}

	// Use the frame number as basis for timestamp to identify frames. Let the
	// first timestamp be non-zero, to not make the IvfFileWriter believe that
	// we want to use capture timestamps in the IVF files.
	VideoFrame source_frame(buffer,
	(frame_number + 1) * k90khzTimestampFrameDiff, 0,
	webrtc::kVideoRotation_0);

	// Ensure we have a new statistics data object we can fill.
	FrameStatistic& stat = stats_->NewFrame(frame_number);

	// Decide if we are going to force a keyframe.
	std::vector<FrameType> frame_types(1, kVideoFrameDelta);
	if (config_.keyframe_interval > 0 &&
	frame_number % config_.keyframe_interval == 0) {
	frame_types[0] = kVideoFrameKey;
	}

	// For dropped frames, we regard them as zero size encoded frames.
	encoded_frame_size_ = 0;
	encoded_frame_type_ = kVideoFrameDelta;

	// For the highest measurement accuracy of the encode time, the start/stop
	// time recordings should wrap the Encode call as tightly as possible.
	encode_start_ns_ = rtc::TimeNanos();
	int32_t encode_result =
	encoder_->Encode(source_frame, nullptr, &frame_types);

	if (encode_result != WEBRTC_VIDEO_CODEC_OK) {
	fprintf(stderr, "Failed to encode frame %d, return code: %d\n",
	frame_number, encode_result);
	}
	stat.encode_return_code = encode_result;

	return true;
	} else {
	// Last frame has been reached.
	return false;
	}
	}

	void VideoProcessorImpl::FrameEncoded(
	webrtc::VideoCodecType codec,
	const EncodedImage& encoded_image,
	const webrtc::RTPFragmentationHeader* fragmentation) {
	// For the highest measurement accuracy of the encode time, the start/stop
	// time recordings should wrap the Encode call as tightly as possible.
	int64_t encode_stop_ns = rtc::TimeNanos();

	if (encoded_frame_writer_) {
	RTC_CHECK(encoded_frame_writer_->WriteFrame(encoded_image, codec));
	}

	// Timestamp is proportional to frame number, so this gives us number of
	// dropped frames.
	int num_dropped_from_prev_encode =
	(encoded_image._timeStamp - prev_time_stamp_) / k90khzTimestampFrameDiff -
	1;
	num_dropped_frames_ += num_dropped_from_prev_encode;
	prev_time_stamp_ = encoded_image._timeStamp;
	if (num_dropped_from_prev_encode > 0) {
	// For dropped frames, we write out the last decoded frame to avoid getting
	// out of sync for the computation of PSNR and SSIM.
	for (int i = 0; i < num_dropped_from_prev_encode; i++) {
	RTC_CHECK(analysis_frame_writer_->WriteFrame(
	last_successful_frame_buffer_.get()));
	if (decoded_frame_writer_) {
	RTC_CHECK(decoded_frame_writer_->WriteFrame(
	last_successful_frame_buffer_.get()));
	}
	}
	}

	// Frame is not dropped, so update the encoded frame size
	// (encoder callback is only called for non-zero length frames).
	encoded_frame_size_ = encoded_image._length;
	encoded_frame_type_ = encoded_image._frameType;
	int frame_number = encoded_image._timeStamp / k90khzTimestampFrameDiff - 1;
	FrameStatistic& stat = stats_->stats_[frame_number];
	stat.encode_time_in_us =
	GetElapsedTimeMicroseconds(encode_start_ns_, encode_stop_ns);
	stat.encoding_successful = true;
	stat.encoded_frame_length_in_bytes = encoded_image._length;
	stat.frame_number = frame_number;
	stat.frame_type = encoded_image._frameType;
	stat.bit_rate_in_kbps = encoded_image._length * bit_rate_factor_;
	stat.total_packets =
	encoded_image._length / config_.networking_config.packet_size_in_bytes +
	1;

	// Simulate packet loss.
	bool exclude_this_frame = false;
	// Only keyframes can be excluded.
	if (encoded_image._frameType == kVideoFrameKey) {
	switch (config_.exclude_frame_types) {
	case kExcludeOnlyFirstKeyFrame:
	if (!first_key_frame_has_been_excluded_) {
	first_key_frame_has_been_excluded_ = true;
	exclude_this_frame = true;
	}
	break;
	case kExcludeAllKeyFrames:
	exclude_this_frame = true;
	break;
	default:
	RTC_NOTREACHED();
	}
	}

	// Make a raw copy of the \|encoded_image\| buffer.
	size_t copied_buffer_size = encoded_image._length +
	EncodedImage::GetBufferPaddingBytes(codec);
	std::unique_ptr<uint8_t[]> copied_buffer(new uint8_t[copied_buffer_size]);
	memcpy(copied_buffer.get(), encoded_image._buffer, encoded_image._length);
	// The image to feed to the decoder.
	EncodedImage copied_image;
	memcpy(&copied_image, &encoded_image, sizeof(copied_image));
	copied_image._size = copied_buffer_size;
	copied_image._buffer = copied_buffer.get();

	if (!exclude_this_frame) {
	stat.packets_dropped =
	packet_manipulator_->ManipulatePackets(&copied_image);
	}

	// Keep track of if frames are lost due to packet loss so we can tell
	// this to the encoder (this is handled by the RTP logic in the full stack).
	// TODO(kjellander): Pass fragmentation header to the decoder when
	// CL 172001 has been submitted and PacketManipulator supports this.

	// For the highest measurement accuracy of the decode time, the start/stop
	// time recordings should wrap the Decode call as tightly as possible.
	decode_start_ns_ = rtc::TimeNanos();
	int32_t decode_result =
	decoder_->Decode(copied_image, last_frame_missing_, nullptr);
	stat.decode_return_code = decode_result;

	if (decode_result != WEBRTC_VIDEO_CODEC_OK) {
	// Write the last successful frame the output file to avoid getting it out
	// of sync with the source file for SSIM and PSNR comparisons.
	RTC_CHECK(analysis_frame_writer_->WriteFrame(
	last_successful_frame_buffer_.get()));
	if (decoded_frame_writer_) {
	RTC_CHECK(decoded_frame_writer_->WriteFrame(
	last_successful_frame_buffer_.get()));
	}
	}

	// Save status for losses so we can inform the decoder for the next frame.
	last_frame_missing_ = copied_image._length == 0;
	}

	void VideoProcessorImpl::FrameDecoded(const VideoFrame& image) {
	// For the highest measurement accuracy of the decode time, the start/stop
	// time recordings should wrap the Decode call as tightly as possible.
	int64_t decode_stop_ns = rtc::TimeNanos();

	// Report stats.
	int frame_number = image.timestamp() / k90khzTimestampFrameDiff - 1;
	FrameStatistic& stat = stats_->stats_[frame_number];
	stat.decode_time_in_us =
	GetElapsedTimeMicroseconds(decode_start_ns_, decode_stop_ns);
	stat.decoding_successful = true;

	// Check for resize action (either down or up).
	if (static_cast<int>(image.width()) != last_encoder_frame_width_ \|\|
	static_cast<int>(image.height()) != last_encoder_frame_height_) {
	++num_spatial_resizes_;
	last_encoder_frame_width_ = image.width();
	last_encoder_frame_height_ = image.height();
	}
	// Check if codec size is different from native/original size, and if so,
	// upsample back to original size. This is needed for PSNR and SSIM
	// calculations.
	if (image.width() != config_.codec_settings->width \|\|
	image.height() != config_.codec_settings->height) {
	rtc::scoped_refptr<I420Buffer> up_image(
	I420Buffer::Create(config_.codec_settings->width,
	config_.codec_settings->height));

	// Should be the same aspect ratio, no cropping needed.
	if (image.video_frame_buffer()->native_handle()) {
	up_image->ScaleFrom(*image.video_frame_buffer()->NativeToI420Buffer());
	} else {
	up_image->ScaleFrom(*image.video_frame_buffer());
	}

	// TODO(mikhal): Extracting the buffer for now - need to update test.
	size_t length =
	CalcBufferSize(kI420, up_image->width(), up_image->height());
	std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[length]);
	int extracted_length = ExtractBuffer(up_image, length, image_buffer.get());
	RTC_CHECK_GT(extracted_length, 0);
	// Update our copy of the last successful frame.
	memcpy(last_successful_frame_buffer_.get(), image_buffer.get(),
	extracted_length);

	RTC_CHECK(analysis_frame_writer_->WriteFrame(image_buffer.get()));
	if (decoded_frame_writer_) {
	RTC_CHECK(decoded_frame_writer_->WriteFrame(image_buffer.get()));
	}
	} else { // No resize.
	// Update our copy of the last successful frame.
	// TODO(mikhal): Add as a member function, so won't be allocated per frame.
	size_t length = CalcBufferSize(kI420, image.width(), image.height());
	std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[length]);
	int extracted_length;
	if (image.video_frame_buffer()->native_handle()) {
	extracted_length =
	ExtractBuffer(image.video_frame_buffer()->NativeToI420Buffer(),
	length, image_buffer.get());
	} else {
	extracted_length =
	ExtractBuffer(image.video_frame_buffer(), length, image_buffer.get());
	}
	RTC_CHECK_GT(extracted_length, 0);
	memcpy(last_successful_frame_buffer_.get(), image_buffer.get(),
	extracted_length);

	RTC_CHECK(analysis_frame_writer_->WriteFrame(image_buffer.get()));
	if (decoded_frame_writer_) {
	RTC_CHECK(decoded_frame_writer_->WriteFrame(image_buffer.get()));
	}
	}
	}

	int VideoProcessorImpl::GetElapsedTimeMicroseconds(int64_t start,
	int64_t stop) {
	int64_t encode_time = (stop - start) / rtc::kNumNanosecsPerMicrosec;
	RTC_DCHECK_GE(encode_time, std::numeric_limits<int>::min());
	RTC_DCHECK_LE(encode_time, std::numeric_limits<int>::max());
	return static_cast<int>(encode_time);
	}

	} // namespace test
	} // namespace webrtc