modules/rtp_rtcp/source/ulpfec_header_reader_writer_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 <string.h>

 #include <memory>
 #include <utility>

 #include "api/scoped_refptr.h"
 #include "modules/rtp_rtcp/source/byte_io.h"
 #include "modules/rtp_rtcp/source/forward_error_correction.h"
 #include "modules/rtp_rtcp/source/forward_error_correction_internal.h"
 #include "modules/rtp_rtcp/source/ulpfec_header_reader_writer.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/random.h"
 #include "test/gtest.h"

 namespace webrtc {

 namespace {

 using Packet = ForwardErrorCorrection::Packet;
 using ReceivedFecPacket = ForwardErrorCorrection::ReceivedFecPacket;

 constexpr uint32_t kMediaSsrc = 1254983;
 constexpr uint16_t kMediaStartSeqNum = 825;
 constexpr size_t kMediaPacketLength = 1234;

 constexpr size_t kUlpfecHeaderSizeLBitClear = 14;
 constexpr size_t kUlpfecHeaderSizeLBitSet = 18;
 constexpr size_t kUlpfecPacketMaskOffset = 12;

 std::unique_ptr<uint8_t[]> GeneratePacketMask(size_t packet_mask_size,
                                               uint64_t seed) {
   Random random(seed);
   std::unique_ptr<uint8_t[]> packet_mask(new uint8_t[packet_mask_size]);
   for (size_t i = 0; i < packet_mask_size; ++i) {
     packet_mask[i] = random.Rand<uint8_t>();
   }
   return packet_mask;
 }

 std::unique_ptr<Packet> WriteHeader(const uint8_t* packet_mask,
                                     size_t packet_mask_size) {
   UlpfecHeaderWriter writer;
   std::unique_ptr<Packet> written_packet(new Packet());
   written_packet->length = kMediaPacketLength;
   for (size_t i = 0; i < written_packet->length; ++i) {
     written_packet->data[i] = i;  // Actual content doesn't matter.
   }
   writer.FinalizeFecHeader(kMediaSsrc, kMediaStartSeqNum, packet_mask,
                            packet_mask_size, written_packet.get());
   return written_packet;
 }

 std::unique_ptr<ReceivedFecPacket> ReadHeader(const Packet& written_packet) {
   UlpfecHeaderReader reader;
   std::unique_ptr<ReceivedFecPacket> read_packet(new ReceivedFecPacket());
   read_packet->ssrc = kMediaSsrc;
   read_packet->pkt = rtc::scoped_refptr<Packet>(new Packet());
   memcpy(read_packet->pkt->data, written_packet.data, written_packet.length);
   read_packet->pkt->length = written_packet.length;
   EXPECT_TRUE(reader.ReadFecHeader(read_packet.get()));
   return read_packet;
 }

 void VerifyHeaders(size_t expected_fec_header_size,
                    const uint8_t* expected_packet_mask,
                    size_t expected_packet_mask_size,
                    const Packet& written_packet,
                    const ReceivedFecPacket& read_packet) {
   EXPECT_EQ(kMediaSsrc, read_packet.ssrc);
   EXPECT_EQ(expected_fec_header_size, read_packet.fec_header_size);
   EXPECT_EQ(kMediaSsrc, read_packet.protected_ssrc);
   EXPECT_EQ(kMediaStartSeqNum, read_packet.seq_num_base);
   EXPECT_EQ(kUlpfecPacketMaskOffset, read_packet.packet_mask_offset);
   ASSERT_EQ(expected_packet_mask_size, read_packet.packet_mask_size);
   EXPECT_EQ(written_packet.length - expected_fec_header_size,
             read_packet.protection_length);
   EXPECT_EQ(0, memcmp(expected_packet_mask,
                       &read_packet.pkt->data[read_packet.packet_mask_offset],
                       read_packet.packet_mask_size));
   // Verify that the call to ReadFecHeader did not tamper with the payload.
   EXPECT_EQ(0, memcmp(&written_packet.data[expected_fec_header_size],
                       &read_packet.pkt->data[expected_fec_header_size],
                       written_packet.length - expected_fec_header_size));
 }

 }  // namespace

 TEST(UlpfecHeaderReaderTest, ReadsSmallHeader) {
   const uint8_t packet[] = {
       0x00, 0x12, 0xab, 0xcd,  // L bit clear, "random" payload type and SN base
       0x12, 0x34, 0x56, 0x78,  // "random" TS recovery
       0xab, 0xcd, 0x11, 0x22,  // "random" length recovery and protection length
       0x33, 0x44,              // "random" packet mask
       0x00, 0x00, 0x00, 0x00   // payload
   };
   const size_t packet_length = sizeof(packet);
   ReceivedFecPacket read_packet;
   read_packet.pkt = rtc::scoped_refptr<Packet>(new Packet());
   memcpy(read_packet.pkt->data, packet, packet_length);
   read_packet.pkt->length = packet_length;

   UlpfecHeaderReader reader;
   EXPECT_TRUE(reader.ReadFecHeader(&read_packet));

   EXPECT_EQ(14U, read_packet.fec_header_size);
   EXPECT_EQ(0xabcdU, read_packet.seq_num_base);
   EXPECT_EQ(12U, read_packet.packet_mask_offset);
   EXPECT_EQ(2U, read_packet.packet_mask_size);
   EXPECT_EQ(0x1122U, read_packet.protection_length);
 }

 TEST(UlpfecHeaderReaderTest, ReadsLargeHeader) {
   const uint8_t packet[] = {
       0x40, 0x12, 0xab, 0xcd,  // L bit set, "random" payload type and SN base
       0x12, 0x34, 0x56, 0x78,  // "random" TS recovery
       0xab, 0xcd, 0x11, 0x22,  // "random" length recovery and protection length
       0x33, 0x44, 0x55, 0x66,  // "random" packet mask
       0x77, 0x88,              //
       0x00, 0x00, 0x00, 0x00   // payload
   };
   const size_t packet_length = sizeof(packet);
   ReceivedFecPacket read_packet;
   read_packet.pkt = rtc::scoped_refptr<Packet>(new Packet());
   memcpy(read_packet.pkt->data, packet, packet_length);
   read_packet.pkt->length = packet_length;

   UlpfecHeaderReader reader;
   EXPECT_TRUE(reader.ReadFecHeader(&read_packet));

   EXPECT_EQ(18U, read_packet.fec_header_size);
   EXPECT_EQ(0xabcdU, read_packet.seq_num_base);
   EXPECT_EQ(12U, read_packet.packet_mask_offset);
   EXPECT_EQ(6U, read_packet.packet_mask_size);
   EXPECT_EQ(0x1122U, read_packet.protection_length);
 }

 TEST(UlpfecHeaderWriterTest, FinalizesSmallHeader) {
   const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear;
   auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);
   Packet written_packet;
   written_packet.length = kMediaPacketLength;
   for (size_t i = 0; i < written_packet.length; ++i) {
     written_packet.data[i] = i;
   }

   UlpfecHeaderWriter writer;
   writer.FinalizeFecHeader(kMediaSsrc, kMediaStartSeqNum, packet_mask.get(),
                            packet_mask_size, &written_packet);

   const uint8_t* packet = written_packet.data;
   EXPECT_EQ(0x00, packet[0] & 0x80);  // E bit.
   EXPECT_EQ(0x00, packet[0] & 0x40);  // L bit.
   EXPECT_EQ(kMediaStartSeqNum, ByteReader<uint16_t>::ReadBigEndian(packet + 2));
   EXPECT_EQ(
       static_cast<uint16_t>(kMediaPacketLength - kUlpfecHeaderSizeLBitClear),
       ByteReader<uint16_t>::ReadBigEndian(packet + 10));
   EXPECT_EQ(0, memcmp(packet + kUlpfecPacketMaskOffset, packet_mask.get(),
                       packet_mask_size));
 }

 TEST(UlpfecHeaderWriterTest, FinalizesLargeHeader) {
   const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet;
   auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);
   Packet written_packet;
   written_packet.length = kMediaPacketLength;
   for (size_t i = 0; i < written_packet.length; ++i) {
     written_packet.data[i] = i;
   }

   UlpfecHeaderWriter writer;
   writer.FinalizeFecHeader(kMediaSsrc, kMediaStartSeqNum, packet_mask.get(),
                            packet_mask_size, &written_packet);

   const uint8_t* packet = written_packet.data;
   EXPECT_EQ(0x00, packet[0] & 0x80);  // E bit.
   EXPECT_EQ(0x40, packet[0] & 0x40);  // L bit.
   EXPECT_EQ(kMediaStartSeqNum, ByteReader<uint16_t>::ReadBigEndian(packet + 2));
   EXPECT_EQ(
       static_cast<uint16_t>(kMediaPacketLength - kUlpfecHeaderSizeLBitSet),
       ByteReader<uint16_t>::ReadBigEndian(packet + 10));
   EXPECT_EQ(0, memcmp(packet + kUlpfecPacketMaskOffset, packet_mask.get(),
                       packet_mask_size));
 }

 TEST(UlpfecHeaderWriterTest, CalculateSmallHeaderSize) {
   const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear;
   auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

   UlpfecHeaderWriter writer;
   size_t min_packet_mask_size =
       writer.MinPacketMaskSize(packet_mask.get(), packet_mask_size);

   EXPECT_EQ(kUlpfecPacketMaskSizeLBitClear, min_packet_mask_size);
   EXPECT_EQ(kUlpfecHeaderSizeLBitClear,
             writer.FecHeaderSize(min_packet_mask_size));
 }

 TEST(UlpfecHeaderWriterTest, CalculateLargeHeaderSize) {
   const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet;
   auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

   UlpfecHeaderWriter writer;
   size_t min_packet_mask_size =
       writer.MinPacketMaskSize(packet_mask.get(), packet_mask_size);

   EXPECT_EQ(kUlpfecPacketMaskSizeLBitSet, min_packet_mask_size);
   EXPECT_EQ(kUlpfecHeaderSizeLBitSet,
             writer.FecHeaderSize(min_packet_mask_size));
 }

 TEST(UlpfecHeaderReaderWriterTest, WriteAndReadSmallHeader) {
   const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear;
   auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

   auto written_packet = WriteHeader(packet_mask.get(), packet_mask_size);
   auto read_packet = ReadHeader(*written_packet);

   VerifyHeaders(kUlpfecHeaderSizeLBitClear, packet_mask.get(), packet_mask_size,
                 *written_packet, *read_packet);
 }

 TEST(UlpfecHeaderReaderWriterTest, WriteAndReadLargeHeader) {
   const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet;
   auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

   auto written_packet = WriteHeader(packet_mask.get(), packet_mask_size);
   auto read_packet = ReadHeader(*written_packet);

   VerifyHeaders(kUlpfecHeaderSizeLBitSet, packet_mask.get(), packet_mask_size,
                 *written_packet, *read_packet);
 }

 }  // 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 <string.h>

	#include <memory>
	#include <utility>

	#include "api/scoped_refptr.h"
	#include "modules/rtp_rtcp/source/byte_io.h"
	#include "modules/rtp_rtcp/source/forward_error_correction.h"
	#include "modules/rtp_rtcp/source/forward_error_correction_internal.h"
	#include "modules/rtp_rtcp/source/ulpfec_header_reader_writer.h"
	#include "rtc_base/checks.h"
	#include "rtc_base/random.h"
	#include "test/gtest.h"

	namespace webrtc {

	namespace {

	using Packet = ForwardErrorCorrection::Packet;
	using ReceivedFecPacket = ForwardErrorCorrection::ReceivedFecPacket;

	constexpr uint32_t kMediaSsrc = 1254983;
	constexpr uint16_t kMediaStartSeqNum = 825;
	constexpr size_t kMediaPacketLength = 1234;

	constexpr size_t kUlpfecHeaderSizeLBitClear = 14;
	constexpr size_t kUlpfecHeaderSizeLBitSet = 18;
	constexpr size_t kUlpfecPacketMaskOffset = 12;

	std::unique_ptr<uint8_t[]> GeneratePacketMask(size_t packet_mask_size,
	uint64_t seed) {
	Random random(seed);
	std::unique_ptr<uint8_t[]> packet_mask(new uint8_t[packet_mask_size]);
	for (size_t i = 0; i < packet_mask_size; ++i) {
	packet_mask[i] = random.Rand<uint8_t>();
	}
	return packet_mask;
	}

	std::unique_ptr<Packet> WriteHeader(const uint8_t* packet_mask,
	size_t packet_mask_size) {
	UlpfecHeaderWriter writer;
	std::unique_ptr<Packet> written_packet(new Packet());
	written_packet->length = kMediaPacketLength;
	for (size_t i = 0; i < written_packet->length; ++i) {
	written_packet->data[i] = i; // Actual content doesn't matter.
	}
	writer.FinalizeFecHeader(kMediaSsrc, kMediaStartSeqNum, packet_mask,
	packet_mask_size, written_packet.get());
	return written_packet;
	}

	std::unique_ptr<ReceivedFecPacket> ReadHeader(const Packet& written_packet) {
	UlpfecHeaderReader reader;
	std::unique_ptr<ReceivedFecPacket> read_packet(new ReceivedFecPacket());
	read_packet->ssrc = kMediaSsrc;
	read_packet->pkt = rtc::scoped_refptr<Packet>(new Packet());
	memcpy(read_packet->pkt->data, written_packet.data, written_packet.length);
	read_packet->pkt->length = written_packet.length;
	EXPECT_TRUE(reader.ReadFecHeader(read_packet.get()));
	return read_packet;
	}

	void VerifyHeaders(size_t expected_fec_header_size,
	const uint8_t* expected_packet_mask,
	size_t expected_packet_mask_size,
	const Packet& written_packet,
	const ReceivedFecPacket& read_packet) {
	EXPECT_EQ(kMediaSsrc, read_packet.ssrc);
	EXPECT_EQ(expected_fec_header_size, read_packet.fec_header_size);
	EXPECT_EQ(kMediaSsrc, read_packet.protected_ssrc);
	EXPECT_EQ(kMediaStartSeqNum, read_packet.seq_num_base);
	EXPECT_EQ(kUlpfecPacketMaskOffset, read_packet.packet_mask_offset);
	ASSERT_EQ(expected_packet_mask_size, read_packet.packet_mask_size);
	EXPECT_EQ(written_packet.length - expected_fec_header_size,
	read_packet.protection_length);
	EXPECT_EQ(0, memcmp(expected_packet_mask,
	&read_packet.pkt->data[read_packet.packet_mask_offset],
	read_packet.packet_mask_size));
	// Verify that the call to ReadFecHeader did not tamper with the payload.
	EXPECT_EQ(0, memcmp(&written_packet.data[expected_fec_header_size],
	&read_packet.pkt->data[expected_fec_header_size],
	written_packet.length - expected_fec_header_size));
	}

	} // namespace

	TEST(UlpfecHeaderReaderTest, ReadsSmallHeader) {
	const uint8_t packet[] = {
	0x00, 0x12, 0xab, 0xcd, // L bit clear, "random" payload type and SN base
	0x12, 0x34, 0x56, 0x78, // "random" TS recovery
	0xab, 0xcd, 0x11, 0x22, // "random" length recovery and protection length
	0x33, 0x44, // "random" packet mask
	0x00, 0x00, 0x00, 0x00 // payload
	};
	const size_t packet_length = sizeof(packet);
	ReceivedFecPacket read_packet;
	read_packet.pkt = rtc::scoped_refptr<Packet>(new Packet());
	memcpy(read_packet.pkt->data, packet, packet_length);
	read_packet.pkt->length = packet_length;

	UlpfecHeaderReader reader;
	EXPECT_TRUE(reader.ReadFecHeader(&read_packet));

	EXPECT_EQ(14U, read_packet.fec_header_size);
	EXPECT_EQ(0xabcdU, read_packet.seq_num_base);
	EXPECT_EQ(12U, read_packet.packet_mask_offset);
	EXPECT_EQ(2U, read_packet.packet_mask_size);
	EXPECT_EQ(0x1122U, read_packet.protection_length);
	}

	TEST(UlpfecHeaderReaderTest, ReadsLargeHeader) {
	const uint8_t packet[] = {
	0x40, 0x12, 0xab, 0xcd, // L bit set, "random" payload type and SN base
	0x12, 0x34, 0x56, 0x78, // "random" TS recovery
	0xab, 0xcd, 0x11, 0x22, // "random" length recovery and protection length
	0x33, 0x44, 0x55, 0x66, // "random" packet mask
	0x77, 0x88, //
	0x00, 0x00, 0x00, 0x00 // payload
	};
	const size_t packet_length = sizeof(packet);
	ReceivedFecPacket read_packet;
	read_packet.pkt = rtc::scoped_refptr<Packet>(new Packet());
	memcpy(read_packet.pkt->data, packet, packet_length);
	read_packet.pkt->length = packet_length;

	UlpfecHeaderReader reader;
	EXPECT_TRUE(reader.ReadFecHeader(&read_packet));

	EXPECT_EQ(18U, read_packet.fec_header_size);
	EXPECT_EQ(0xabcdU, read_packet.seq_num_base);
	EXPECT_EQ(12U, read_packet.packet_mask_offset);
	EXPECT_EQ(6U, read_packet.packet_mask_size);
	EXPECT_EQ(0x1122U, read_packet.protection_length);
	}

	TEST(UlpfecHeaderWriterTest, FinalizesSmallHeader) {
	const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear;
	auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);
	Packet written_packet;
	written_packet.length = kMediaPacketLength;
	for (size_t i = 0; i < written_packet.length; ++i) {
	written_packet.data[i] = i;
	}

	UlpfecHeaderWriter writer;
	writer.FinalizeFecHeader(kMediaSsrc, kMediaStartSeqNum, packet_mask.get(),
	packet_mask_size, &written_packet);

	const uint8_t* packet = written_packet.data;
	EXPECT_EQ(0x00, packet[0] & 0x80); // E bit.
	EXPECT_EQ(0x00, packet[0] & 0x40); // L bit.
	EXPECT_EQ(kMediaStartSeqNum, ByteReader<uint16_t>::ReadBigEndian(packet + 2));
	EXPECT_EQ(
	static_cast<uint16_t>(kMediaPacketLength - kUlpfecHeaderSizeLBitClear),
	ByteReader<uint16_t>::ReadBigEndian(packet + 10));
	EXPECT_EQ(0, memcmp(packet + kUlpfecPacketMaskOffset, packet_mask.get(),
	packet_mask_size));
	}

	TEST(UlpfecHeaderWriterTest, FinalizesLargeHeader) {
	const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet;
	auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);
	Packet written_packet;
	written_packet.length = kMediaPacketLength;
	for (size_t i = 0; i < written_packet.length; ++i) {
	written_packet.data[i] = i;
	}

	UlpfecHeaderWriter writer;
	writer.FinalizeFecHeader(kMediaSsrc, kMediaStartSeqNum, packet_mask.get(),
	packet_mask_size, &written_packet);

	const uint8_t* packet = written_packet.data;
	EXPECT_EQ(0x00, packet[0] & 0x80); // E bit.
	EXPECT_EQ(0x40, packet[0] & 0x40); // L bit.
	EXPECT_EQ(kMediaStartSeqNum, ByteReader<uint16_t>::ReadBigEndian(packet + 2));
	EXPECT_EQ(
	static_cast<uint16_t>(kMediaPacketLength - kUlpfecHeaderSizeLBitSet),
	ByteReader<uint16_t>::ReadBigEndian(packet + 10));
	EXPECT_EQ(0, memcmp(packet + kUlpfecPacketMaskOffset, packet_mask.get(),
	packet_mask_size));
	}

	TEST(UlpfecHeaderWriterTest, CalculateSmallHeaderSize) {
	const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear;
	auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

	UlpfecHeaderWriter writer;
	size_t min_packet_mask_size =
	writer.MinPacketMaskSize(packet_mask.get(), packet_mask_size);

	EXPECT_EQ(kUlpfecPacketMaskSizeLBitClear, min_packet_mask_size);
	EXPECT_EQ(kUlpfecHeaderSizeLBitClear,
	writer.FecHeaderSize(min_packet_mask_size));
	}

	TEST(UlpfecHeaderWriterTest, CalculateLargeHeaderSize) {
	const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet;
	auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

	UlpfecHeaderWriter writer;
	size_t min_packet_mask_size =
	writer.MinPacketMaskSize(packet_mask.get(), packet_mask_size);

	EXPECT_EQ(kUlpfecPacketMaskSizeLBitSet, min_packet_mask_size);
	EXPECT_EQ(kUlpfecHeaderSizeLBitSet,
	writer.FecHeaderSize(min_packet_mask_size));
	}

	TEST(UlpfecHeaderReaderWriterTest, WriteAndReadSmallHeader) {
	const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitClear;
	auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

	auto written_packet = WriteHeader(packet_mask.get(), packet_mask_size);
	auto read_packet = ReadHeader(*written_packet);

	VerifyHeaders(kUlpfecHeaderSizeLBitClear, packet_mask.get(), packet_mask_size,
	written_packet, read_packet);
	}

	TEST(UlpfecHeaderReaderWriterTest, WriteAndReadLargeHeader) {
	const size_t packet_mask_size = kUlpfecPacketMaskSizeLBitSet;
	auto packet_mask = GeneratePacketMask(packet_mask_size, 0xabcd);

	auto written_packet = WriteHeader(packet_mask.get(), packet_mask_size);
	auto read_packet = ReadHeader(*written_packet);

	VerifyHeaders(kUlpfecHeaderSizeLBitSet, packet_mask.get(), packet_mask_size,
	written_packet, read_packet);
	}

	} // namespace webrtc