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/*
* Copyright (c) 2014 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.
*/
// Unit tests for test Packet class.
#include "modules/audio_coding/neteq/tools/packet.h"
#include "test/gtest.h"
namespace webrtc {
namespace test {
namespace {
const int kHeaderLengthBytes = 12;
void MakeRtpHeader(int payload_type,
int seq_number,
uint32_t timestamp,
uint32_t ssrc,
uint8_t* rtp_data) {
rtp_data[0] = 0x80;
rtp_data[1] = static_cast<uint8_t>(payload_type);
rtp_data[2] = (seq_number >> 8) & 0xFF;
rtp_data[3] = (seq_number)&0xFF;
rtp_data[4] = timestamp >> 24;
rtp_data[5] = (timestamp >> 16) & 0xFF;
rtp_data[6] = (timestamp >> 8) & 0xFF;
rtp_data[7] = timestamp & 0xFF;
rtp_data[8] = ssrc >> 24;
rtp_data[9] = (ssrc >> 16) & 0xFF;
rtp_data[10] = (ssrc >> 8) & 0xFF;
rtp_data[11] = ssrc & 0xFF;
}
} // namespace
TEST(TestPacket, RegularPacket) {
const size_t kPacketLengthBytes = 100;
rtc::CopyOnWriteBuffer packet_memory(kPacketLengthBytes);
const uint8_t kPayloadType = 17;
const uint16_t kSequenceNumber = 4711;
const uint32_t kTimestamp = 47114711;
const uint32_t kSsrc = 0x12345678;
MakeRtpHeader(kPayloadType, kSequenceNumber, kTimestamp, kSsrc,
packet_memory.MutableData());
const double kPacketTime = 1.0;
Packet packet(std::move(packet_memory), kPacketTime);
ASSERT_TRUE(packet.valid_header());
EXPECT_EQ(kPayloadType, packet.header().payloadType);
EXPECT_EQ(kSequenceNumber, packet.header().sequenceNumber);
EXPECT_EQ(kTimestamp, packet.header().timestamp);
EXPECT_EQ(kSsrc, packet.header().ssrc);
EXPECT_EQ(0, packet.header().numCSRCs);
EXPECT_EQ(kPacketLengthBytes, packet.packet_length_bytes());
EXPECT_EQ(kPacketLengthBytes - kHeaderLengthBytes,
packet.payload_length_bytes());
EXPECT_EQ(kPacketLengthBytes, packet.virtual_packet_length_bytes());
EXPECT_EQ(kPacketLengthBytes - kHeaderLengthBytes,
packet.virtual_payload_length_bytes());
EXPECT_EQ(kPacketTime, packet.time_ms());
}
TEST(TestPacket, DummyPacket) {
const size_t kPacketLengthBytes = kHeaderLengthBytes; // Only RTP header.
const size_t kVirtualPacketLengthBytes = 100;
rtc::CopyOnWriteBuffer packet_memory(kPacketLengthBytes);
const uint8_t kPayloadType = 17;
const uint16_t kSequenceNumber = 4711;
const uint32_t kTimestamp = 47114711;
const uint32_t kSsrc = 0x12345678;
MakeRtpHeader(kPayloadType, kSequenceNumber, kTimestamp, kSsrc,
packet_memory.MutableData());
const double kPacketTime = 1.0;
Packet packet(std::move(packet_memory), kVirtualPacketLengthBytes,
kPacketTime);
ASSERT_TRUE(packet.valid_header());
EXPECT_EQ(kPayloadType, packet.header().payloadType);
EXPECT_EQ(kSequenceNumber, packet.header().sequenceNumber);
EXPECT_EQ(kTimestamp, packet.header().timestamp);
EXPECT_EQ(kSsrc, packet.header().ssrc);
EXPECT_EQ(0, packet.header().numCSRCs);
EXPECT_EQ(kPacketLengthBytes, packet.packet_length_bytes());
EXPECT_EQ(kPacketLengthBytes - kHeaderLengthBytes,
packet.payload_length_bytes());
EXPECT_EQ(kVirtualPacketLengthBytes, packet.virtual_packet_length_bytes());
EXPECT_EQ(kVirtualPacketLengthBytes - kHeaderLengthBytes,
packet.virtual_payload_length_bytes());
EXPECT_EQ(kPacketTime, packet.time_ms());
}
TEST(TestPacket, DummyPaddingPacket) {
const size_t kPacketLengthBytes = kHeaderLengthBytes; // Only RTP header.
const size_t kVirtualPacketLengthBytes = 100;
rtc::CopyOnWriteBuffer packet_memory(kPacketLengthBytes);
const uint8_t kPayloadType = 17;
const uint16_t kSequenceNumber = 4711;
const uint32_t kTimestamp = 47114711;
const uint32_t kSsrc = 0x12345678;
MakeRtpHeader(kPayloadType, kSequenceNumber, kTimestamp, kSsrc,
packet_memory.MutableData());
packet_memory.MutableData()[0] |= 0b0010'0000; // Set the padding bit.
const double kPacketTime = 1.0;
Packet packet(std::move(packet_memory), kVirtualPacketLengthBytes,
kPacketTime);
ASSERT_TRUE(packet.valid_header());
EXPECT_EQ(kPayloadType, packet.header().payloadType);
EXPECT_EQ(kSequenceNumber, packet.header().sequenceNumber);
EXPECT_EQ(kTimestamp, packet.header().timestamp);
EXPECT_EQ(kSsrc, packet.header().ssrc);
EXPECT_EQ(0, packet.header().numCSRCs);
EXPECT_EQ(kPacketLengthBytes, packet.packet_length_bytes());
EXPECT_EQ(kPacketLengthBytes - kHeaderLengthBytes,
packet.payload_length_bytes());
EXPECT_EQ(kVirtualPacketLengthBytes, packet.virtual_packet_length_bytes());
EXPECT_EQ(kVirtualPacketLengthBytes - kHeaderLengthBytes,
packet.virtual_payload_length_bytes());
EXPECT_EQ(kPacketTime, packet.time_ms());
}
namespace {
// Writes one RED block header starting at `rtp_data`, according to RFC 2198.
// returns the number of bytes written (1 or 4).
//
// Format if `last_payoad` is false:
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |1| block PT | timestamp offset | block length |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Format if `last_payoad` is true:
// 0 1 2 3 4 5 6 7
// +-+-+-+-+-+-+-+-+
// |0| Block PT |
// +-+-+-+-+-+-+-+-+
int MakeRedHeader(int payload_type,
uint32_t timestamp_offset,
int block_length,
bool last_payload,
uint8_t* rtp_data) {
rtp_data[0] = 0x80 | (payload_type & 0x7F); // Set the first bit to 1.
if (last_payload) {
rtp_data[0] &= 0x7F; // Reset the first but to 0 to indicate last block.
return 1;
}
rtp_data[1] = timestamp_offset >> 6;
rtp_data[2] = (timestamp_offset & 0x3F) << 2;
rtp_data[2] |= block_length >> 8;
rtp_data[3] = block_length & 0xFF;
return 4;
}
} // namespace
TEST(TestPacket, RED) {
const size_t kPacketLengthBytes = 100;
rtc::CopyOnWriteBuffer packet_memory(kPacketLengthBytes);
const uint8_t kRedPayloadType = 17;
const uint16_t kSequenceNumber = 4711;
const uint32_t kTimestamp = 47114711;
const uint32_t kSsrc = 0x12345678;
MakeRtpHeader(kRedPayloadType, kSequenceNumber, kTimestamp, kSsrc,
packet_memory.MutableData());
// Create four RED headers.
// Payload types are just the same as the block index the offset is 100 times
// the block index.
const int kRedBlocks = 4;
uint8_t* payload_ptr = packet_memory.MutableData() +
kHeaderLengthBytes; // First byte after header.
for (int i = 0; i < kRedBlocks; ++i) {
int payload_type = i;
// Offset value is not used for the last block.
uint32_t timestamp_offset = 100 * i;
int block_length = 10 * i;
bool last_block = (i == kRedBlocks - 1) ? true : false;
payload_ptr += MakeRedHeader(payload_type, timestamp_offset, block_length,
last_block, payload_ptr);
}
const double kPacketTime = 1.0;
// Hand over ownership of `packet_memory` to `packet`.
Packet packet(packet_memory, kPacketLengthBytes, kPacketTime);
ASSERT_TRUE(packet.valid_header());
EXPECT_EQ(kRedPayloadType, packet.header().payloadType);
EXPECT_EQ(kSequenceNumber, packet.header().sequenceNumber);
EXPECT_EQ(kTimestamp, packet.header().timestamp);
EXPECT_EQ(kSsrc, packet.header().ssrc);
EXPECT_EQ(0, packet.header().numCSRCs);
EXPECT_EQ(kPacketLengthBytes, packet.packet_length_bytes());
EXPECT_EQ(kPacketLengthBytes - kHeaderLengthBytes,
packet.payload_length_bytes());
EXPECT_EQ(kPacketLengthBytes, packet.virtual_packet_length_bytes());
EXPECT_EQ(kPacketLengthBytes - kHeaderLengthBytes,
packet.virtual_payload_length_bytes());
EXPECT_EQ(kPacketTime, packet.time_ms());
std::list<RTPHeader*> red_headers;
EXPECT_TRUE(packet.ExtractRedHeaders(&red_headers));
EXPECT_EQ(kRedBlocks, static_cast<int>(red_headers.size()));
int block_index = 0;
for (std::list<RTPHeader*>::reverse_iterator it = red_headers.rbegin();
it != red_headers.rend(); ++it) {
// Reading list from the back, since the extraction puts the main payload
// (which is the last one on wire) first.
RTPHeader* red_block = *it;
EXPECT_EQ(block_index, red_block->payloadType);
EXPECT_EQ(kSequenceNumber, red_block->sequenceNumber);
if (block_index == kRedBlocks - 1) {
// Last block has zero offset per definition.
EXPECT_EQ(kTimestamp, red_block->timestamp);
} else {
EXPECT_EQ(kTimestamp - 100 * block_index, red_block->timestamp);
}
EXPECT_EQ(kSsrc, red_block->ssrc);
EXPECT_EQ(0, red_block->numCSRCs);
++block_index;
}
Packet::DeleteRedHeaders(&red_headers);
}
} // namespace test
} // namespace webrtc