modules/video_coding/h264_sps_pps_tracker_unittest.cc - src - Git at Google

 /*
  *  Copyright (c) 2016 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 "modules/video_coding/h264_sps_pps_tracker.h"

 #include <string.h>

 #include <vector>

 #include "absl/types/variant.h"
 #include "common_video/h264/h264_common.h"
 #include "modules/rtp_rtcp/source/rtp_video_header.h"
 #include "modules/video_coding/codecs/h264/include/h264_globals.h"
 #include "test/gmock.h"
 #include "test/gtest.h"

 namespace webrtc {
 namespace video_coding {
 namespace {

 using ::testing::ElementsAreArray;
 using ::testing::SizeIs;

 const uint8_t start_code[] = {0, 0, 0, 1};

 rtc::ArrayView<const uint8_t> Bitstream(
     const H264SpsPpsTracker::FixedBitstream& fixed) {
   return fixed.bitstream;
 }

 void ExpectSpsPpsIdr(const RTPVideoHeaderH264& codec_header,
                      uint8_t sps_id,
                      uint8_t pps_id) {
   bool contains_sps = false;
   bool contains_pps = false;
   bool contains_idr = false;
   for (const auto& nalu : codec_header.nalus) {
     if (nalu.type == H264::NaluType::kSps) {
       EXPECT_EQ(sps_id, nalu.sps_id);
       contains_sps = true;
     } else if (nalu.type == H264::NaluType::kPps) {
       EXPECT_EQ(sps_id, nalu.sps_id);
       EXPECT_EQ(pps_id, nalu.pps_id);
       contains_pps = true;
     } else if (nalu.type == H264::NaluType::kIdr) {
       EXPECT_EQ(pps_id, nalu.pps_id);
       contains_idr = true;
     }
   }
   EXPECT_TRUE(contains_sps);
   EXPECT_TRUE(contains_pps);
   EXPECT_TRUE(contains_idr);
 }

 class H264VideoHeader : public RTPVideoHeader {
  public:
   H264VideoHeader() {
     codec = kVideoCodecH264;
     is_first_packet_in_frame = false;
     auto& h264_header = video_type_header.emplace<RTPVideoHeaderH264>();
     h264_header.packetization_type = kH264SingleNalu;
   }

   RTPVideoHeaderH264& h264() {
     return absl::get<RTPVideoHeaderH264>(video_type_header);
   }
 };

 }  // namespace

 class TestH264SpsPpsTracker : public ::testing::Test {
  public:
   void AddSps(H264VideoHeader* header,
               uint8_t sps_id,
               std::vector<uint8_t>* data) {
     NaluInfo info;
     info.type = H264::NaluType::kSps;
     info.sps_id = sps_id;
     info.pps_id = -1;
     data->push_back(H264::NaluType::kSps);
     data->push_back(sps_id);  // The sps data, just a single byte.

     header->h264().nalus.push_back(info);
   }

   void AddPps(H264VideoHeader* header,
               uint8_t sps_id,
               uint8_t pps_id,
               std::vector<uint8_t>* data) {
     NaluInfo info;
     info.type = H264::NaluType::kPps;
     info.sps_id = sps_id;
     info.pps_id = pps_id;
     data->push_back(H264::NaluType::kPps);
     data->push_back(pps_id);  // The pps data, just a single byte.

     header->h264().nalus.push_back(info);
   }

   void AddIdr(H264VideoHeader* header, int pps_id) {
     NaluInfo info;
     info.type = H264::NaluType::kIdr;
     info.sps_id = -1;
     info.pps_id = pps_id;

     header->h264().nalus.push_back(info);
   }

  protected:
   H264SpsPpsTracker tracker_;
 };

 TEST_F(TestH264SpsPpsTracker, NoNalus) {
   uint8_t data[] = {1, 2, 3};
   H264VideoHeader header;
   header.h264().packetization_type = kH264FuA;

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &header);

   EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(data));
 }

 TEST_F(TestH264SpsPpsTracker, FuAFirstPacket) {
   uint8_t data[] = {1, 2, 3};
   H264VideoHeader header;
   header.h264().packetization_type = kH264FuA;
   header.h264().nalus.resize(1);
   header.is_first_packet_in_frame = true;

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &header);

   EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
   std::vector<uint8_t> expected;
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {1, 2, 3});
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
 }

 TEST_F(TestH264SpsPpsTracker, StapAIncorrectSegmentLength) {
   uint8_t data[] = {0, 0, 2, 0};
   H264VideoHeader header;
   header.h264().packetization_type = kH264StapA;
   header.is_first_packet_in_frame = true;

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
             H264SpsPpsTracker::kDrop);
 }

 TEST_F(TestH264SpsPpsTracker, ConsecutiveStapA) {
   // When the GenericFrameDescriptor or DependencyDescriptor RTP header
   // extensions are used, we may receive a series of StapA packets where only
   // the first packet has is_first_packet_in_frame = true set.
   std::vector<uint8_t> data;
   H264VideoHeader first_header;
   first_header.h264().packetization_type = kH264StapA;
   first_header.is_first_packet_in_frame = true;

   // SPS in first packet.
   data.insert(data.end(), {0});     // First byte is ignored
   data.insert(data.end(), {0, 2});  // Length of segment
   AddSps(&first_header, 13, &data);
   H264SpsPpsTracker::FixedBitstream first_fixed =
       tracker_.CopyAndFixBitstream(data, &first_header);
   EXPECT_THAT(first_fixed.action, H264SpsPpsTracker::kInsert);

   H264VideoHeader second_header;
   second_header.h264().packetization_type = kH264StapA;
   second_header.is_first_packet_in_frame = false;

   // PPS and IDR in second packet.
   data.insert(data.end(), {0, 2});  // Length of segment
   AddPps(&second_header, 13, 27, &data);
   data.insert(data.end(), {0, 5});  // Length of segment
   AddIdr(&second_header, 27);
   data.insert(data.end(), {1, 2, 3, 2, 1});

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &second_header);

   EXPECT_THAT(fixed.action, H264SpsPpsTracker::kInsert);
   std::vector<uint8_t> expected;
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {H264::NaluType::kSps, 13});
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {H264::NaluType::kPps, 27});
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {1, 2, 3, 2, 1});
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
 }

 TEST_F(TestH264SpsPpsTracker, SingleNaluInsertStartCode) {
   uint8_t data[] = {1, 2, 3};
   H264VideoHeader header;
   header.h264().nalus.resize(1);

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &header);

   EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
   std::vector<uint8_t> expected;
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {1, 2, 3});
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
 }

 TEST_F(TestH264SpsPpsTracker, NoStartCodeInsertedForSubsequentFuAPacket) {
   std::vector<uint8_t> data = {1, 2, 3};
   H264VideoHeader header;
   header.h264().packetization_type = kH264FuA;
   // Since no NALU begin in this packet the nalus are empty.
   header.h264().nalus.clear();

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &header);

   EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(data));
 }

 TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoSpsPpsInserted) {
   std::vector<uint8_t> data = {1, 2, 3};
   H264VideoHeader header;
   header.is_first_packet_in_frame = true;
   AddIdr(&header, 0);

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
             H264SpsPpsTracker::kRequestKeyframe);
 }

 TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoPpsInserted) {
   std::vector<uint8_t> data = {1, 2, 3};
   H264VideoHeader header;
   header.is_first_packet_in_frame = true;
   AddSps(&header, 0, &data);
   AddIdr(&header, 0);

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
             H264SpsPpsTracker::kRequestKeyframe);
 }

 TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoSpsInserted) {
   std::vector<uint8_t> data = {1, 2, 3};
   H264VideoHeader header;
   header.is_first_packet_in_frame = true;
   AddPps(&header, 0, 0, &data);
   AddIdr(&header, 0);

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
             H264SpsPpsTracker::kRequestKeyframe);
 }

 TEST_F(TestH264SpsPpsTracker, SpsPpsPacketThenIdrFirstPacket) {
   std::vector<uint8_t> data;
   H264VideoHeader sps_pps_header;
   // Insert SPS/PPS
   AddSps(&sps_pps_header, 0, &data);
   AddPps(&sps_pps_header, 0, 1, &data);

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &sps_pps_header).action,
             H264SpsPpsTracker::kInsert);

   // Insert first packet of the IDR
   H264VideoHeader idr_header;
   idr_header.is_first_packet_in_frame = true;
   AddIdr(&idr_header, 1);
   data = {1, 2, 3};

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &idr_header);
   EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);

   std::vector<uint8_t> expected;
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {1, 2, 3});
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
 }

 TEST_F(TestH264SpsPpsTracker, SpsPpsIdrInStapA) {
   std::vector<uint8_t> data;
   H264VideoHeader header;
   header.h264().packetization_type = kH264StapA;
   header.is_first_packet_in_frame = true;  // Always true for StapA

   data.insert(data.end(), {0});     // First byte is ignored
   data.insert(data.end(), {0, 2});  // Length of segment
   AddSps(&header, 13, &data);
   data.insert(data.end(), {0, 2});  // Length of segment
   AddPps(&header, 13, 27, &data);
   data.insert(data.end(), {0, 5});  // Length of segment
   AddIdr(&header, 27);
   data.insert(data.end(), {1, 2, 3, 2, 1});

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(data, &header);

   EXPECT_THAT(fixed.action, H264SpsPpsTracker::kInsert);

   std::vector<uint8_t> expected;
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {H264::NaluType::kSps, 13});
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {H264::NaluType::kPps, 27});
   expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
   expected.insert(expected.end(), {1, 2, 3, 2, 1});
   EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
 }

 TEST_F(TestH264SpsPpsTracker, SpsPpsOutOfBand) {
   constexpr uint8_t kData[] = {1, 2, 3};

   // Generated by "ffmpeg -r 30 -f avfoundation -i "default" out.h264" on macos.
   // width: 320, height: 240
   const std::vector<uint8_t> sps(
       {0x67, 0x7a, 0x00, 0x0d, 0xbc, 0xd9, 0x41, 0x41, 0xfa, 0x10, 0x00, 0x00,
        0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x03, 0xc0, 0xf1, 0x42, 0x99, 0x60});
   const std::vector<uint8_t> pps({0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0});
   tracker_.InsertSpsPpsNalus(sps, pps);

   // Insert first packet of the IDR.
   H264VideoHeader idr_header;
   idr_header.is_first_packet_in_frame = true;
   AddIdr(&idr_header, 0);
   EXPECT_THAT(idr_header.h264().nalus, SizeIs(1));

   H264SpsPpsTracker::FixedBitstream fixed =
       tracker_.CopyAndFixBitstream(kData, &idr_header);

   EXPECT_THAT(idr_header.h264().nalus, SizeIs(3));
   EXPECT_EQ(idr_header.width, 320u);
   EXPECT_EQ(idr_header.height, 240u);
   ExpectSpsPpsIdr(idr_header.h264(), 0, 0);
 }

 TEST_F(TestH264SpsPpsTracker, SpsPpsOutOfBandWrongNaluHeader) {
   constexpr uint8_t kData[] = {1, 2, 3};

   // Generated by "ffmpeg -r 30 -f avfoundation -i "default" out.h264" on macos.
   // Nalu headers manupilated afterwards.
   const std::vector<uint8_t> sps(
       {0xff, 0x7a, 0x00, 0x0d, 0xbc, 0xd9, 0x41, 0x41, 0xfa, 0x10, 0x00, 0x00,
        0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x03, 0xc0, 0xf1, 0x42, 0x99, 0x60});
   const std::vector<uint8_t> pps({0xff, 0xeb, 0xe3, 0xcb, 0x22, 0xc0});
   tracker_.InsertSpsPpsNalus(sps, pps);

   // Insert first packet of the IDR.
   H264VideoHeader idr_header;
   idr_header.is_first_packet_in_frame = true;
   AddIdr(&idr_header, 0);

   EXPECT_EQ(tracker_.CopyAndFixBitstream(kData, &idr_header).action,
             H264SpsPpsTracker::kRequestKeyframe);
 }

 TEST_F(TestH264SpsPpsTracker, SpsPpsOutOfBandIncompleteNalu) {
   constexpr uint8_t kData[] = {1, 2, 3};

   // Generated by "ffmpeg -r 30 -f avfoundation -i "default" out.h264" on macos.
   // Nalus damaged afterwards.
   const std::vector<uint8_t> sps({0x67, 0x7a, 0x00, 0x0d, 0xbc, 0xd9});
   const std::vector<uint8_t> pps({0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0});
   tracker_.InsertSpsPpsNalus(sps, pps);

   // Insert first packet of the IDR.
   H264VideoHeader idr_header;
   idr_header.is_first_packet_in_frame = true;
   AddIdr(&idr_header, 0);

   EXPECT_EQ(tracker_.CopyAndFixBitstream(kData, &idr_header).action,
             H264SpsPpsTracker::kRequestKeyframe);
 }

 TEST_F(TestH264SpsPpsTracker, SaveRestoreWidthHeight) {
   std::vector<uint8_t> data;

   // Insert an SPS/PPS packet with width/height and make sure
   // that information is set on the first IDR packet.
   H264VideoHeader sps_pps_header;
   AddSps(&sps_pps_header, 0, &data);
   AddPps(&sps_pps_header, 0, 1, &data);
   sps_pps_header.width = 320;
   sps_pps_header.height = 240;

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &sps_pps_header).action,
             H264SpsPpsTracker::kInsert);

   H264VideoHeader idr_header;
   idr_header.is_first_packet_in_frame = true;
   AddIdr(&idr_header, 1);
   data.insert(data.end(), {1, 2, 3});

   EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &idr_header).action,
             H264SpsPpsTracker::kInsert);

   EXPECT_EQ(idr_header.width, 320);
   EXPECT_EQ(idr_header.height, 240);
 }

 }  // namespace video_coding
 }  // namespace webrtc
	/*
	* Copyright (c) 2016 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 "modules/video_coding/h264_sps_pps_tracker.h"

	#include <string.h>

	#include <vector>

	#include "absl/types/variant.h"
	#include "common_video/h264/h264_common.h"
	#include "modules/rtp_rtcp/source/rtp_video_header.h"
	#include "modules/video_coding/codecs/h264/include/h264_globals.h"
	#include "test/gmock.h"
	#include "test/gtest.h"

	namespace webrtc {
	namespace video_coding {
	namespace {

	using ::testing::ElementsAreArray;
	using ::testing::SizeIs;

	const uint8_t start_code[] = {0, 0, 0, 1};

	rtc::ArrayView<const uint8_t> Bitstream(
	const H264SpsPpsTracker::FixedBitstream& fixed) {
	return fixed.bitstream;
	}

	void ExpectSpsPpsIdr(const RTPVideoHeaderH264& codec_header,
	uint8_t sps_id,
	uint8_t pps_id) {
	bool contains_sps = false;
	bool contains_pps = false;
	bool contains_idr = false;
	for (const auto& nalu : codec_header.nalus) {
	if (nalu.type == H264::NaluType::kSps) {
	EXPECT_EQ(sps_id, nalu.sps_id);
	contains_sps = true;
	} else if (nalu.type == H264::NaluType::kPps) {
	EXPECT_EQ(sps_id, nalu.sps_id);
	EXPECT_EQ(pps_id, nalu.pps_id);
	contains_pps = true;
	} else if (nalu.type == H264::NaluType::kIdr) {
	EXPECT_EQ(pps_id, nalu.pps_id);
	contains_idr = true;
	}
	}
	EXPECT_TRUE(contains_sps);
	EXPECT_TRUE(contains_pps);
	EXPECT_TRUE(contains_idr);
	}

	class H264VideoHeader : public RTPVideoHeader {
	public:
	H264VideoHeader() {
	codec = kVideoCodecH264;
	is_first_packet_in_frame = false;
	auto& h264_header = video_type_header.emplace<RTPVideoHeaderH264>();
	h264_header.packetization_type = kH264SingleNalu;
	}

	RTPVideoHeaderH264& h264() {
	return absl::get<RTPVideoHeaderH264>(video_type_header);
	}
	};

	} // namespace

	class TestH264SpsPpsTracker : public ::testing::Test {
	public:
	void AddSps(H264VideoHeader* header,
	uint8_t sps_id,
	std::vector<uint8_t>* data) {
	NaluInfo info;
	info.type = H264::NaluType::kSps;
	info.sps_id = sps_id;
	info.pps_id = -1;
	data->push_back(H264::NaluType::kSps);
	data->push_back(sps_id); // The sps data, just a single byte.

	header->h264().nalus.push_back(info);
	}

	void AddPps(H264VideoHeader* header,
	uint8_t sps_id,
	uint8_t pps_id,
	std::vector<uint8_t>* data) {
	NaluInfo info;
	info.type = H264::NaluType::kPps;
	info.sps_id = sps_id;
	info.pps_id = pps_id;
	data->push_back(H264::NaluType::kPps);
	data->push_back(pps_id); // The pps data, just a single byte.

	header->h264().nalus.push_back(info);
	}

	void AddIdr(H264VideoHeader* header, int pps_id) {
	NaluInfo info;
	info.type = H264::NaluType::kIdr;
	info.sps_id = -1;
	info.pps_id = pps_id;

	header->h264().nalus.push_back(info);
	}

	protected:
	H264SpsPpsTracker tracker_;
	};

	TEST_F(TestH264SpsPpsTracker, NoNalus) {
	uint8_t data[] = {1, 2, 3};
	H264VideoHeader header;
	header.h264().packetization_type = kH264FuA;

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &header);

	EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(data));
	}

	TEST_F(TestH264SpsPpsTracker, FuAFirstPacket) {
	uint8_t data[] = {1, 2, 3};
	H264VideoHeader header;
	header.h264().packetization_type = kH264FuA;
	header.h264().nalus.resize(1);
	header.is_first_packet_in_frame = true;

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &header);

	EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
	std::vector<uint8_t> expected;
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {1, 2, 3});
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
	}

	TEST_F(TestH264SpsPpsTracker, StapAIncorrectSegmentLength) {
	uint8_t data[] = {0, 0, 2, 0};
	H264VideoHeader header;
	header.h264().packetization_type = kH264StapA;
	header.is_first_packet_in_frame = true;

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
	H264SpsPpsTracker::kDrop);
	}

	TEST_F(TestH264SpsPpsTracker, ConsecutiveStapA) {
	// When the GenericFrameDescriptor or DependencyDescriptor RTP header
	// extensions are used, we may receive a series of StapA packets where only
	// the first packet has is_first_packet_in_frame = true set.
	std::vector<uint8_t> data;
	H264VideoHeader first_header;
	first_header.h264().packetization_type = kH264StapA;
	first_header.is_first_packet_in_frame = true;

	// SPS in first packet.
	data.insert(data.end(), {0}); // First byte is ignored
	data.insert(data.end(), {0, 2}); // Length of segment
	AddSps(&first_header, 13, &data);
	H264SpsPpsTracker::FixedBitstream first_fixed =
	tracker_.CopyAndFixBitstream(data, &first_header);
	EXPECT_THAT(first_fixed.action, H264SpsPpsTracker::kInsert);

	H264VideoHeader second_header;
	second_header.h264().packetization_type = kH264StapA;
	second_header.is_first_packet_in_frame = false;

	// PPS and IDR in second packet.
	data.insert(data.end(), {0, 2}); // Length of segment
	AddPps(&second_header, 13, 27, &data);
	data.insert(data.end(), {0, 5}); // Length of segment
	AddIdr(&second_header, 27);
	data.insert(data.end(), {1, 2, 3, 2, 1});

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &second_header);

	EXPECT_THAT(fixed.action, H264SpsPpsTracker::kInsert);
	std::vector<uint8_t> expected;
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {H264::NaluType::kSps, 13});
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {H264::NaluType::kPps, 27});
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {1, 2, 3, 2, 1});
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
	}

	TEST_F(TestH264SpsPpsTracker, SingleNaluInsertStartCode) {
	uint8_t data[] = {1, 2, 3};
	H264VideoHeader header;
	header.h264().nalus.resize(1);

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &header);

	EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
	std::vector<uint8_t> expected;
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {1, 2, 3});
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
	}

	TEST_F(TestH264SpsPpsTracker, NoStartCodeInsertedForSubsequentFuAPacket) {
	std::vector<uint8_t> data = {1, 2, 3};
	H264VideoHeader header;
	header.h264().packetization_type = kH264FuA;
	// Since no NALU begin in this packet the nalus are empty.
	header.h264().nalus.clear();

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &header);

	EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(data));
	}

	TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoSpsPpsInserted) {
	std::vector<uint8_t> data = {1, 2, 3};
	H264VideoHeader header;
	header.is_first_packet_in_frame = true;
	AddIdr(&header, 0);

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
	H264SpsPpsTracker::kRequestKeyframe);
	}

	TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoPpsInserted) {
	std::vector<uint8_t> data = {1, 2, 3};
	H264VideoHeader header;
	header.is_first_packet_in_frame = true;
	AddSps(&header, 0, &data);
	AddIdr(&header, 0);

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
	H264SpsPpsTracker::kRequestKeyframe);
	}

	TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoSpsInserted) {
	std::vector<uint8_t> data = {1, 2, 3};
	H264VideoHeader header;
	header.is_first_packet_in_frame = true;
	AddPps(&header, 0, 0, &data);
	AddIdr(&header, 0);

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &header).action,
	H264SpsPpsTracker::kRequestKeyframe);
	}

	TEST_F(TestH264SpsPpsTracker, SpsPpsPacketThenIdrFirstPacket) {
	std::vector<uint8_t> data;
	H264VideoHeader sps_pps_header;
	// Insert SPS/PPS
	AddSps(&sps_pps_header, 0, &data);
	AddPps(&sps_pps_header, 0, 1, &data);

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &sps_pps_header).action,
	H264SpsPpsTracker::kInsert);

	// Insert first packet of the IDR
	H264VideoHeader idr_header;
	idr_header.is_first_packet_in_frame = true;
	AddIdr(&idr_header, 1);
	data = {1, 2, 3};

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &idr_header);
	EXPECT_EQ(fixed.action, H264SpsPpsTracker::kInsert);

	std::vector<uint8_t> expected;
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {1, 2, 3});
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
	}

	TEST_F(TestH264SpsPpsTracker, SpsPpsIdrInStapA) {
	std::vector<uint8_t> data;
	H264VideoHeader header;
	header.h264().packetization_type = kH264StapA;
	header.is_first_packet_in_frame = true; // Always true for StapA

	data.insert(data.end(), {0}); // First byte is ignored
	data.insert(data.end(), {0, 2}); // Length of segment
	AddSps(&header, 13, &data);
	data.insert(data.end(), {0, 2}); // Length of segment
	AddPps(&header, 13, 27, &data);
	data.insert(data.end(), {0, 5}); // Length of segment
	AddIdr(&header, 27);
	data.insert(data.end(), {1, 2, 3, 2, 1});

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(data, &header);

	EXPECT_THAT(fixed.action, H264SpsPpsTracker::kInsert);

	std::vector<uint8_t> expected;
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {H264::NaluType::kSps, 13});
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {H264::NaluType::kPps, 27});
	expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
	expected.insert(expected.end(), {1, 2, 3, 2, 1});
	EXPECT_THAT(Bitstream(fixed), ElementsAreArray(expected));
	}

	TEST_F(TestH264SpsPpsTracker, SpsPpsOutOfBand) {
	constexpr uint8_t kData[] = {1, 2, 3};

	// Generated by "ffmpeg -r 30 -f avfoundation -i "default" out.h264" on macos.
	// width: 320, height: 240
	const std::vector<uint8_t> sps(
	{0x67, 0x7a, 0x00, 0x0d, 0xbc, 0xd9, 0x41, 0x41, 0xfa, 0x10, 0x00, 0x00,
	0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x03, 0xc0, 0xf1, 0x42, 0x99, 0x60});
	const std::vector<uint8_t> pps({0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0});
	tracker_.InsertSpsPpsNalus(sps, pps);

	// Insert first packet of the IDR.
	H264VideoHeader idr_header;
	idr_header.is_first_packet_in_frame = true;
	AddIdr(&idr_header, 0);
	EXPECT_THAT(idr_header.h264().nalus, SizeIs(1));

	H264SpsPpsTracker::FixedBitstream fixed =
	tracker_.CopyAndFixBitstream(kData, &idr_header);

	EXPECT_THAT(idr_header.h264().nalus, SizeIs(3));
	EXPECT_EQ(idr_header.width, 320u);
	EXPECT_EQ(idr_header.height, 240u);
	ExpectSpsPpsIdr(idr_header.h264(), 0, 0);
	}

	TEST_F(TestH264SpsPpsTracker, SpsPpsOutOfBandWrongNaluHeader) {
	constexpr uint8_t kData[] = {1, 2, 3};

	// Generated by "ffmpeg -r 30 -f avfoundation -i "default" out.h264" on macos.
	// Nalu headers manupilated afterwards.
	const std::vector<uint8_t> sps(
	{0xff, 0x7a, 0x00, 0x0d, 0xbc, 0xd9, 0x41, 0x41, 0xfa, 0x10, 0x00, 0x00,
	0x03, 0x00, 0x10, 0x00, 0x00, 0x03, 0x03, 0xc0, 0xf1, 0x42, 0x99, 0x60});
	const std::vector<uint8_t> pps({0xff, 0xeb, 0xe3, 0xcb, 0x22, 0xc0});
	tracker_.InsertSpsPpsNalus(sps, pps);

	// Insert first packet of the IDR.
	H264VideoHeader idr_header;
	idr_header.is_first_packet_in_frame = true;
	AddIdr(&idr_header, 0);

	EXPECT_EQ(tracker_.CopyAndFixBitstream(kData, &idr_header).action,
	H264SpsPpsTracker::kRequestKeyframe);
	}

	TEST_F(TestH264SpsPpsTracker, SpsPpsOutOfBandIncompleteNalu) {
	constexpr uint8_t kData[] = {1, 2, 3};

	// Generated by "ffmpeg -r 30 -f avfoundation -i "default" out.h264" on macos.
	// Nalus damaged afterwards.
	const std::vector<uint8_t> sps({0x67, 0x7a, 0x00, 0x0d, 0xbc, 0xd9});
	const std::vector<uint8_t> pps({0x68, 0xeb, 0xe3, 0xcb, 0x22, 0xc0});
	tracker_.InsertSpsPpsNalus(sps, pps);

	// Insert first packet of the IDR.
	H264VideoHeader idr_header;
	idr_header.is_first_packet_in_frame = true;
	AddIdr(&idr_header, 0);

	EXPECT_EQ(tracker_.CopyAndFixBitstream(kData, &idr_header).action,
	H264SpsPpsTracker::kRequestKeyframe);
	}

	TEST_F(TestH264SpsPpsTracker, SaveRestoreWidthHeight) {
	std::vector<uint8_t> data;

	// Insert an SPS/PPS packet with width/height and make sure
	// that information is set on the first IDR packet.
	H264VideoHeader sps_pps_header;
	AddSps(&sps_pps_header, 0, &data);
	AddPps(&sps_pps_header, 0, 1, &data);
	sps_pps_header.width = 320;
	sps_pps_header.height = 240;

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &sps_pps_header).action,
	H264SpsPpsTracker::kInsert);

	H264VideoHeader idr_header;
	idr_header.is_first_packet_in_frame = true;
	AddIdr(&idr_header, 1);
	data.insert(data.end(), {1, 2, 3});

	EXPECT_EQ(tracker_.CopyAndFixBitstream(data, &idr_header).action,
	H264SpsPpsTracker::kInsert);

	EXPECT_EQ(idr_header.width, 320);
	EXPECT_EQ(idr_header.height, 240);
	}

	} // namespace video_coding
	} // namespace webrtc