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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 "modules/video_coding/protection_bitrate_calculator.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;
}
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), media_opt_(&clock_, &protection_callback_) {}
SimulatedClock clock_;
ProtectionCallback protection_callback_;
ProtectionBitrateCalculator media_opt_;
};
TEST_F(ProtectionBitrateCalculatorTest, ProtectsUsingFecBitrate) {
static const uint32_t kMaxBitrateBps = 130000;
media_opt_.SetProtectionMethod(true /*enable_fec*/, false /* enable_nack */);
media_opt_.SetEncodingData(640, 480, 1, 1000);
// Using 10% of codec bitrate for FEC.
protection_callback_.fec_rate_bps_ = kCodecBitrateBps / 10;
uint32_t target_bitrate = media_opt_.SetTargetRates(kMaxBitrateBps, 30, 0, 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 = media_opt_.SetTargetRates(kMaxBitrateBps, 30, 128, 100);
EXPECT_EQ(kMaxBitrateBps / 2, target_bitrate);
}
TEST_F(ProtectionBitrateCalculatorTest, ProtectsUsingNackBitrate) {
static const uint32_t kMaxBitrateBps = 130000;
media_opt_.SetProtectionMethod(false /*enable_fec*/, true /* enable_nack */);
media_opt_.SetEncodingData(640, 480, 1, 1000);
uint32_t target_bitrate = media_opt_.SetTargetRates(kMaxBitrateBps, 30, 0, 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 = media_opt_.SetTargetRates(kMaxBitrateBps, 30, 128, 100);
EXPECT_EQ(kMaxBitrateBps / 2, target_bitrate);
}
TEST_F(ProtectionBitrateCalculatorTest, NoProtection) {
static const uint32_t kMaxBitrateBps = 130000;
media_opt_.SetProtectionMethod(false /*enable_fec*/, false /* enable_nack */);
media_opt_.SetEncodingData(640, 480, 1, 1000);
uint32_t target_bitrate =
media_opt_.SetTargetRates(kMaxBitrateBps, 30, 128, 100);
EXPECT_EQ(kMaxBitrateBps, target_bitrate);
}
} // namespace webrtc