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/*
* 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 <list>
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/modules/rtp_rtcp/source/fec_test_helper.h"
#include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h"
#include "webrtc/modules/rtp_rtcp/source/producer_fec.h"
namespace webrtc {
void VerifyHeader(uint16_t seq_num,
uint32_t timestamp,
int red_pltype,
int fec_pltype,
RedPacket* packet,
bool marker_bit) {
EXPECT_GT(packet->length(), kRtpHeaderSize);
EXPECT_TRUE(packet->data() != NULL);
uint8_t* data = packet->data();
// Marker bit not set.
EXPECT_EQ(marker_bit ? 0x80 : 0, data[1] & 0x80);
EXPECT_EQ(red_pltype, data[1] & 0x7F);
EXPECT_EQ(seq_num, (data[2] << 8) + data[3]);
uint32_t parsed_timestamp = (data[4] << 24) + (data[5] << 16) +
(data[6] << 8) + data[7];
EXPECT_EQ(timestamp, parsed_timestamp);
EXPECT_EQ(static_cast<uint8_t>(fec_pltype), data[kRtpHeaderSize]);
}
class ProducerFecTest : public ::testing::Test {
protected:
virtual void SetUp() {
fec_ = new ForwardErrorCorrection();
producer_ = new ProducerFec(fec_);
generator_ = new FrameGenerator;
}
virtual void TearDown() {
delete producer_;
delete fec_;
delete generator_;
}
ForwardErrorCorrection* fec_;
ProducerFec* producer_;
FrameGenerator* generator_;
};
TEST_F(ProducerFecTest, OneFrameFec) {
// The number of media packets (|kNumPackets|), number of frames (one for
// this test), and the protection factor (|params->fec_rate|) are set to make
// sure the conditions for generating FEC are satisfied. This means:
// (1) protection factor is high enough so that actual overhead over 1 frame
// of packets is within |kMaxExcessOverhead|, and (2) the total number of
// media packets for 1 frame is at least |minimum_media_packets_fec_|.
const int kNumPackets = 4;
FecProtectionParams params = {15, false, 3};
std::list<RtpPacket*> rtp_packets;
generator_->NewFrame(kNumPackets);
producer_->SetFecParameters(¶ms, 0); // Expecting one FEC packet.
uint32_t last_timestamp = 0;
for (int i = 0; i < kNumPackets; ++i) {
RtpPacket* rtp_packet = generator_->NextPacket(i, 10);
rtp_packets.push_back(rtp_packet);
EXPECT_EQ(0, producer_->AddRtpPacketAndGenerateFec(rtp_packet->data,
rtp_packet->length,
kRtpHeaderSize));
last_timestamp = rtp_packet->header.header.timestamp;
}
EXPECT_TRUE(producer_->FecAvailable());
uint16_t seq_num = generator_->NextSeqNum();
std::vector<RedPacket*> packets = producer_->GetFecPackets(kRedPayloadType,
kFecPayloadType,
seq_num,
kRtpHeaderSize);
EXPECT_FALSE(producer_->FecAvailable());
ASSERT_EQ(1u, packets.size());
VerifyHeader(seq_num, last_timestamp,
kRedPayloadType, kFecPayloadType, packets.front(), false);
while (!rtp_packets.empty()) {
delete rtp_packets.front();
rtp_packets.pop_front();
}
delete packets.front();
}
TEST_F(ProducerFecTest, TwoFrameFec) {
// The number of media packets/frame (|kNumPackets|), the number of frames
// (|kNumFrames|), and the protection factor (|params->fec_rate|) are set to
// make sure the conditions for generating FEC are satisfied. This means:
// (1) protection factor is high enough so that actual overhead over
// |kNumFrames| is within |kMaxExcessOverhead|, and (2) the total number of
// media packets for |kNumFrames| frames is at least
// |minimum_media_packets_fec_|.
const int kNumPackets = 2;
const int kNumFrames = 2;
FecProtectionParams params = {15, 0, 3};
std::list<RtpPacket*> rtp_packets;
producer_->SetFecParameters(¶ms, 0); // Expecting one FEC packet.
uint32_t last_timestamp = 0;
for (int i = 0; i < kNumFrames; ++i) {
generator_->NewFrame(kNumPackets);
for (int j = 0; j < kNumPackets; ++j) {
RtpPacket* rtp_packet = generator_->NextPacket(i * kNumPackets + j, 10);
rtp_packets.push_back(rtp_packet);
EXPECT_EQ(0, producer_->AddRtpPacketAndGenerateFec(rtp_packet->data,
rtp_packet->length,
kRtpHeaderSize));
last_timestamp = rtp_packet->header.header.timestamp;
}
}
EXPECT_TRUE(producer_->FecAvailable());
uint16_t seq_num = generator_->NextSeqNum();
std::vector<RedPacket*> packets = producer_->GetFecPackets(kRedPayloadType,
kFecPayloadType,
seq_num,
kRtpHeaderSize);
EXPECT_FALSE(producer_->FecAvailable());
ASSERT_EQ(1u, packets.size());
VerifyHeader(seq_num, last_timestamp, kRedPayloadType, kFecPayloadType,
packets.front(), false);
while (!rtp_packets.empty()) {
delete rtp_packets.front();
rtp_packets.pop_front();
}
delete packets.front();
}
TEST_F(ProducerFecTest, BuildRedPacket) {
generator_->NewFrame(1);
RtpPacket* packet = generator_->NextPacket(0, 10);
rtc::scoped_ptr<RedPacket> red_packet(producer_->BuildRedPacket(
packet->data, packet->length - kRtpHeaderSize, kRtpHeaderSize,
kRedPayloadType));
EXPECT_EQ(packet->length + 1, red_packet->length());
VerifyHeader(packet->header.header.sequenceNumber,
packet->header.header.timestamp,
kRedPayloadType,
packet->header.header.payloadType,
red_packet.get(),
true); // Marker bit set.
for (int i = 0; i < 10; ++i)
EXPECT_EQ(i, red_packet->data()[kRtpHeaderSize + 1 + i]);
delete packet;
}
} // namespace webrtc
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