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Tracking packet feedback availability in BitrateAllocator.

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This CL adds tracking of packet feedback availability in the
BitrateAllocator class.

This is part of a series of CLs tracking the transport feedback status
of the streams known to BitrateAllocator and reporting the status to
the congestion controller.

Bug: webrtc:8415
Change-Id: Ie46d7040494ba116928d791a8e4c5dae6992cafc
Reviewed-on: https://webrtc-review.googlesource.com/63202
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22534}
This commit is contained in:
Sebastian Jansson 2018-03-21 12:45:27 +01:00 committed by Commit Bot
parent fe617a3af1
commit 29b204ede8
2 changed files with 31 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
call/bitrate_allocator.cc
View File

@ -59,6 +59,7 @@ BitrateAllocator::BitrateAllocator(LimitObserver* limit_observer)
last_bwe_log_time_(0),
total_requested_padding_bitrate_(0),
total_requested_min_bitrate_(0),
has_packet_feedback_(false),
bitrate_allocation_strategy_(nullptr),
transmission_max_bitrate_multiplier_(
GetTransmissionMaxBitrateMultiplier()) {
@ -145,7 +146,8 @@ void BitrateAllocator::AddObserver(BitrateAllocatorObserver* observer,
uint32_t pad_up_bitrate_bps,
bool enforce_min_bitrate,
std::string track_id,
double bitrate_priority) {
double bitrate_priority,
bool has_packet_feedback) {
RTC_DCHECK_CALLED_SEQUENTIALLY(&sequenced_checker_);
RTC_DCHECK_GT(bitrate_priority, 0);
RTC_DCHECK(std::isnormal(bitrate_priority));
@ -161,7 +163,7 @@ void BitrateAllocator::AddObserver(BitrateAllocatorObserver* observer,
} else {
bitrate_observer_configs_.push_back(ObserverConfig(
observer, min_bitrate_bps, max_bitrate_bps, pad_up_bitrate_bps,
enforce_min_bitrate, track_id, bitrate_priority));
enforce_min_bitrate, track_id, bitrate_priority, has_packet_feedback));
}
ObserverAllocation allocation;
@ -193,7 +195,7 @@ void BitrateAllocator::UpdateAllocationLimits() {
uint32_t total_requested_padding_bitrate = 0;
uint32_t total_requested_min_bitrate = 0;
uint32_t total_requested_bitrate = 0;
bool has_packet_feedback = false;
for (const auto& config : bitrate_observer_configs_) {
uint32_t stream_padding = config.pad_up_bitrate_bps;
if (config.enforce_min_bitrate) {
@ -204,23 +206,27 @@ void BitrateAllocator::UpdateAllocationLimits() {
}
total_requested_padding_bitrate += stream_padding;
total_requested_bitrate += config.max_bitrate_bps;
if (config.allocated_bitrate_bps > 0 && config.has_packet_feedback)
has_packet_feedback = true;
}
if (total_requested_padding_bitrate == total_requested_padding_bitrate_ &&
total_requested_min_bitrate == total_requested_min_bitrate_) {
total_requested_min_bitrate == total_requested_min_bitrate_ &&
has_packet_feedback == has_packet_feedback_) {
return;
}
total_requested_min_bitrate_ = total_requested_min_bitrate;
total_requested_padding_bitrate_ = total_requested_padding_bitrate;
has_packet_feedback_ = has_packet_feedback;
RTC_LOG(LS_INFO) << "UpdateAllocationLimits : total_requested_min_bitrate: "
<< total_requested_min_bitrate
<< "bps, total_requested_padding_bitrate: "
<< total_requested_padding_bitrate << "bps";
limit_observer_->OnAllocationLimitsChanged(total_requested_min_bitrate,
total_requested_padding_bitrate,
total_requested_bitrate, true);
limit_observer_->OnAllocationLimitsChanged(
total_requested_min_bitrate, total_requested_padding_bitrate,
total_requested_bitrate, has_packet_feedback);
}
void BitrateAllocator::RemoveObserver(BitrateAllocatorObserver* observer) {

26
call/bitrate_allocator.h
View File

@ -70,7 +70,7 @@ class BitrateAllocator {
int64_t rtt,
int64_t bwe_period_ms);
// Set the start and max send bitrate used by the bandwidth management.
// Set the configuration used by the bandwidth management.
//
// |observer| updates bitrates if already in use.
// |min_bitrate_bps| = 0 equals no min bitrate.
@ -78,17 +78,23 @@ class BitrateAllocator {
// |enforce_min_bitrate| = 'true' will allocate at least |min_bitrate_bps| for
// this observer, even if the BWE is too low, 'false' will allocate 0 to
// the observer if BWE doesn't allow |min_bitrate_bps|.
// Note that |observer|->OnBitrateUpdated() will be called within the scope of
// this method with the current rtt, fraction_loss and available bitrate and
// that the bitrate in OnBitrateUpdated will be zero if the |observer| is
// currently not allowed to send data.
// |has_packet_feedback| indicates whether the data produced by the
// corresponding media stream will receive per packet feedback. This is
// tracked here to communicate to limit observers whether packet feedback can
// be expected, which is true if any of the active observers has packet
// feedback enabled. Note that |observer|->OnBitrateUpdated() will be called
// within the scope of this method with the current rtt, fraction_loss and
// available bitrate and that the bitrate in OnBitrateUpdated will be zero if
// the |observer| is currently not allowed to send data.
void AddObserver(BitrateAllocatorObserver* observer,
uint32_t min_bitrate_bps,
uint32_t max_bitrate_bps,
uint32_t pad_up_bitrate_bps,
bool enforce_min_bitrate,
std::string track_id,
double bitrate_priority);
double bitrate_priority,
// TODO(srte): Remove default when callers have been fixed.
bool has_packet_feedback = false);
// Removes a previously added observer, but will not trigger a new bitrate
// allocation.
@ -113,7 +119,8 @@ class BitrateAllocator {
uint32_t pad_up_bitrate_bps,
bool enforce_min_bitrate,
std::string track_id,
double bitrate_priority)
double bitrate_priority,
bool has_packet_feedback)
: TrackConfig(min_bitrate_bps,
max_bitrate_bps,
enforce_min_bitrate,
@ -122,7 +129,8 @@ class BitrateAllocator {
pad_up_bitrate_bps(pad_up_bitrate_bps),
allocated_bitrate_bps(-1),
media_ratio(1.0),
bitrate_priority(bitrate_priority) {}
bitrate_priority(bitrate_priority),
has_packet_feedback(has_packet_feedback) {}
BitrateAllocatorObserver* observer;
uint32_t pad_up_bitrate_bps;
@ -132,6 +140,7 @@ class BitrateAllocator {
// observers. If an observer has twice the bitrate_priority of other
// observers, it should be allocated twice the bitrate above its min.
double bitrate_priority;
bool has_packet_feedback;
uint32_t LastAllocatedBitrate() const;
// The minimum bitrate required by this observer, including
@ -211,6 +220,7 @@ class BitrateAllocator {
int64_t last_bwe_log_time_ RTC_GUARDED_BY(&sequenced_checker_);
uint32_t total_requested_padding_bitrate_ RTC_GUARDED_BY(&sequenced_checker_);
uint32_t total_requested_min_bitrate_ RTC_GUARDED_BY(&sequenced_checker_);
bool has_packet_feedback_ RTC_GUARDED_BY(&sequenced_checker_);
std::unique_ptr<rtc::BitrateAllocationStrategy> bitrate_allocation_strategy_
RTC_GUARDED_BY(&sequenced_checker_);
uint8_t transmission_max_bitrate_multiplier_;