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/*
* 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 "api/fec_controller.h"
#include <stdint.h>
#include <vector>
#include "api/environment/environment_factory.h"
#include "modules/include/module_fec_types.h"
#include "modules/video_coding/fec_controller_default.h"
#include "system_wrappers/include/clock.h"
#include "test/gtest.h"
namespace webrtc {
static const int kCodecBitrateBps = 100000;
class ProtectionBitrateCalculatorTest : public ::testing::Test {
protected:
enum {
kSampleRate = 90000 // RTP timestamps per second.
};
class ProtectionCallback : public VCMProtectionCallback {
public:
int ProtectionRequest(const FecProtectionParams* delta_params,
const FecProtectionParams* key_params,
uint32_t* sent_video_rate_bps,
uint32_t* sent_nack_rate_bps,
uint32_t* sent_fec_rate_bps) override {
*sent_video_rate_bps = kCodecBitrateBps;
*sent_nack_rate_bps = nack_rate_bps_;
*sent_fec_rate_bps = fec_rate_bps_;
return 0;
}
void SetRetransmissionMode(int retransmission_mode) {}
uint32_t fec_rate_bps_ = 0;
uint32_t nack_rate_bps_ = 0;
};
// Note: simulated clock starts at 1 seconds, since parts of webrtc use 0 as
// a special case (e.g. frame rate in media optimization).
ProtectionBitrateCalculatorTest()
: clock_(1000),
fec_controller_(CreateEnvironment(&clock_), &protection_callback_) {}
SimulatedClock clock_;
ProtectionCallback protection_callback_;
FecControllerDefault fec_controller_;
};
TEST_F(ProtectionBitrateCalculatorTest, ProtectsUsingFecBitrate) {
static const uint32_t kMaxBitrateBps = 130000;
fec_controller_.SetProtectionMethod(true /*enable_fec*/,
false /* enable_nack */);
fec_controller_.SetEncodingData(640, 480, 1, 1000);
// Using 10% of codec bitrate for FEC.
protection_callback_.fec_rate_bps_ = kCodecBitrateBps / 10;
uint32_t target_bitrate = fec_controller_.UpdateFecRates(
kMaxBitrateBps, 30, 0, std::vector<bool>(1, false), 0);
EXPECT_GT(target_bitrate, 0u);
EXPECT_GT(kMaxBitrateBps, target_bitrate);
// Using as much for codec bitrate as fec rate, new target rate should share
// both equally, but only be half of max (since that ceiling should be hit).
protection_callback_.fec_rate_bps_ = kCodecBitrateBps;
target_bitrate = fec_controller_.UpdateFecRates(
kMaxBitrateBps, 30, 128, std::vector<bool>(1, false), 100);
EXPECT_EQ(kMaxBitrateBps / 2, target_bitrate);
}
TEST_F(ProtectionBitrateCalculatorTest, ProtectsUsingNackBitrate) {
static const uint32_t kMaxBitrateBps = 130000;
fec_controller_.SetProtectionMethod(false /*enable_fec*/,
true /* enable_nack */);
fec_controller_.SetEncodingData(640, 480, 1, 1000);
uint32_t target_bitrate = fec_controller_.UpdateFecRates(
kMaxBitrateBps, 30, 0, std::vector<bool>(1, false), 0);
EXPECT_EQ(kMaxBitrateBps, target_bitrate);
// Using as much for codec bitrate as nack rate, new target rate should share
// both equally, but only be half of max (since that ceiling should be hit).
protection_callback_.nack_rate_bps_ = kMaxBitrateBps;
target_bitrate = fec_controller_.UpdateFecRates(
kMaxBitrateBps, 30, 128, std::vector<bool>(1, false), 100);
EXPECT_EQ(kMaxBitrateBps / 2, target_bitrate);
}
TEST_F(ProtectionBitrateCalculatorTest, NoProtection) {
static const uint32_t kMaxBitrateBps = 130000;
fec_controller_.SetProtectionMethod(false /*enable_fec*/,
false /* enable_nack */);
fec_controller_.SetEncodingData(640, 480, 1, 1000);
uint32_t target_bitrate = fec_controller_.UpdateFecRates(
kMaxBitrateBps, 30, 128, std::vector<bool>(1, false), 100);
EXPECT_EQ(kMaxBitrateBps, target_bitrate);
}
} // namespace webrtc