zqz/platform-external-webrtc
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Stop changing the requested max bitrate based on protection level.

Browse Source 
With the current implementation, whenever we are toggling between
sending/not sending retransmissions, the BitrateAllocator will
toggle the total requested max bitrate that is signalled to the
probing mechanism. The result is that spurious probes are sent
mid-call, at |max_bitrate| and |2*max_bitrate|. This behaviour
is undesirable, and thus removed in this CL. Instead, whenever
the allocation limits actually change, we produce a single
set of probes at |max_bitrate| and |2*max_bitrate|.

This CL does not change how the BitrateAllocator hysteresis is
accounting for protection, since it does not relate to the
spurious probes.

Bug: webrtc:10275
TBR: sprang@webrtc.org
Change-Id: Iab3a690a500372c74772a8ad6217fb838af15ade
Reviewed-on: https://webrtc-review.googlesource.com/c/120808
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26544}
This commit is contained in:
Rasmus Brandt
2019-02-04 15:09:34 +01:00
committed by Commit Bot
parent 167316b833
commit 681de2036b
3 changed files with 50 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
call/bitrate_allocator_unittest.cc
View File

@ -17,8 +17,9 @@
#include "test/gmock.h"
#include "test/gtest.h"
using ::testing::NiceMock;
using ::testing::_;
using ::testing::NiceMock;
using ::testing::StrictMock;
namespace webrtc {
// Emulating old interface for test suite compatibility.
@ -347,27 +348,21 @@ TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserverWithPacketLoss) {
// Add loss and use a part of the bitrate for protection.
const double kProtectionRatio = 0.4;
uint32_t target_bitrate_bps = 200000;
const uint32_t kMaxBitrateWithProtectionBps =
static_cast<uint32_t>(kMaxBitrateBps * 2);
uint8_t fraction_loss = kProtectionRatio * 256;
const uint8_t fraction_loss = kProtectionRatio * 256;
bitrate_observer.SetBitrateProtectionRatio(kProtectionRatio);
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(0, 0, kMaxBitrateWithProtectionBps));
allocator_->OnNetworkChanged(target_bitrate_bps, 0, fraction_loss,
allocator_->OnNetworkChanged(200000, 0, fraction_loss,
kDefaultProbingIntervalMs);
EXPECT_EQ(target_bitrate_bps, bitrate_observer.last_bitrate_bps_);
EXPECT_EQ(200000u, bitrate_observer.last_bitrate_bps_);
// Above the min threshold, but not enough given the protection used.
// Limits changed, as we will video is now off and we need to pad up to the
// start bitrate.
target_bitrate_bps = kMinStartBitrateBps + 1000;
// Verify the hysteresis is added for the protection.
const uint32_t kMinStartBitrateWithProtectionBps =
static_cast<uint32_t>(kMinStartBitrateBps * (1 + kProtectionRatio));
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(0, kMinStartBitrateWithProtectionBps,
kMaxBitrateWithProtectionBps));
kMaxBitrateBps));
allocator_->OnNetworkChanged(kMinStartBitrateBps + 1000, 0, fraction_loss,
kDefaultProbingIntervalMs);
EXPECT_EQ(0u, bitrate_observer.last_bitrate_bps_);
@ -377,9 +372,7 @@ TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserverWithPacketLoss) {
EXPECT_EQ(0u, bitrate_observer.last_bitrate_bps_);
// Just enough to enable video again.
target_bitrate_bps = kMinStartBitrateWithProtectionBps;
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(0, 0, kMaxBitrateWithProtectionBps));
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(0, 0, kMaxBitrateBps));
allocator_->OnNetworkChanged(kMinStartBitrateWithProtectionBps, 0,
fraction_loss, kDefaultProbingIntervalMs);
EXPECT_EQ(kMinStartBitrateWithProtectionBps,
@ -387,7 +380,6 @@ TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserverWithPacketLoss) {
// Remove all protection and make sure video is not paused as earlier.
bitrate_observer.SetBitrateProtectionRatio(0.0);
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(0, 0, kMaxBitrateBps));
allocator_->OnNetworkChanged(kMinStartBitrateWithProtectionBps - 1000, 0, 0,
kDefaultProbingIntervalMs);
EXPECT_EQ(kMinStartBitrateWithProtectionBps - 1000,
@ -401,6 +393,40 @@ TEST_F(BitrateAllocatorTestNoEnforceMin, OneBitrateObserverWithPacketLoss) {
allocator_->RemoveObserver(&bitrate_observer);
}
TEST_F(BitrateAllocatorTest,
TotalAllocationLimitsAreUnaffectedByProtectionRatio) {
TestBitrateObserver bitrate_observer;
const uint32_t kMinBitrateBps = 100000;
const uint32_t kMaxBitrateBps = 400000;
// Register |bitrate_observer| and expect total allocation limits to change.
EXPECT_CALL(limit_observer_,
OnAllocationLimitsChanged(kMinBitrateBps, 0, kMaxBitrateBps))
.Times(1);
allocator_->AddObserver(
&bitrate_observer,
{kMinBitrateBps, kMaxBitrateBps, 0, true, "", kDefaultBitratePriority});
// Observer uses 20% of it's allocated bitrate for protection.
bitrate_observer.SetBitrateProtectionRatio(/*protection_ratio=*/0.2);
// Total allocation limits are unaffected by the protection rate change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(_, _, _)).Times(0);
allocator_->OnNetworkChanged(200000u, 0, 100, kDefaultProbingIntervalMs);
// Observer uses 0% of it's allocated bitrate for protection.
bitrate_observer.SetBitrateProtectionRatio(/*protection_ratio=*/0.0);
// Total allocation limits are unaffected by the protection rate change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(_, _, _)).Times(0);
allocator_->OnNetworkChanged(200000u, 0, 100, kDefaultProbingIntervalMs);
// Observer again uses 20% of it's allocated bitrate for protection.
bitrate_observer.SetBitrateProtectionRatio(/*protection_ratio=*/0.2);
// Total allocation limits are unaffected by the protection rate change.
EXPECT_CALL(limit_observer_, OnAllocationLimitsChanged(_, _, _)).Times(0);
allocator_->OnNetworkChanged(200000u, 0, 100, kDefaultProbingIntervalMs);
}
TEST_F(BitrateAllocatorTestNoEnforceMin, TwoBitrateObserverWithPacketLoss) {
TestBitrateObserver bitrate_observer_1;
TestBitrateObserver bitrate_observer_2;