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webrtc/video/frame_buffer_proxy.cc
Danil Chapovalov 95eeaa7aca Migrate video/ to absl::AnyInvocable based TaskQueueBase interface 
Bug: webrtc:14245
Change-Id: Ibd98d3a0c548443578953ef3e25aee9919eea3d3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/267980
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37465}
2022-07-06 14:40:25 +00:00

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/*
* Copyright (c) 2022 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 "video/frame_buffer_proxy.h"
#include <algorithm>
#include <memory>
#include <utility>
#include "absl/base/attributes.h"
#include "absl/functional/bind_front.h"
#include "api/sequence_checker.h"
#include "api/units/data_size.h"
#include "api/video/encoded_frame.h"
#include "api/video/frame_buffer.h"
#include "api/video/video_content_type.h"
#include "modules/video_coding/frame_buffer2.h"
#include "modules/video_coding/frame_helpers.h"
#include "modules/video_coding/timing/inter_frame_delay.h"
#include "modules/video_coding/timing/jitter_estimator.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/thread_annotations.h"
#include "video/frame_decode_timing.h"
#include "video/task_queue_frame_decode_scheduler.h"
#include "video/video_receive_stream_timeout_tracker.h"
namespace webrtc {
namespace {
class FrameBuffer2Proxy : public FrameBufferProxy {
public:
FrameBuffer2Proxy(Clock* clock,
VCMTiming* timing,
VCMReceiveStatisticsCallback* stats_proxy,
rtc::TaskQueue* decode_queue,
FrameSchedulingReceiver* receiver,
TimeDelta max_wait_for_keyframe,
TimeDelta max_wait_for_frame,
const FieldTrialsView& field_trials)
: max_wait_for_keyframe_(max_wait_for_keyframe),
max_wait_for_frame_(max_wait_for_frame),
frame_buffer_(clock, timing, stats_proxy, field_trials),
decode_queue_(decode_queue),
stats_proxy_(stats_proxy),
receiver_(receiver) {
RTC_DCHECK(decode_queue_);
RTC_DCHECK(stats_proxy_);
RTC_DCHECK(receiver_);
}
void StopOnWorker() override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
decode_queue_->PostTask([this] {
frame_buffer_.Stop();
decode_safety_->SetNotAlive();
});
}
void SetProtectionMode(VCMVideoProtection protection_mode) override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
frame_buffer_.SetProtectionMode(kProtectionNackFEC);
}
void Clear() override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
frame_buffer_.Clear();
}
absl::optional<int64_t> InsertFrame(
std::unique_ptr<EncodedFrame> frame) override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
int64_t last_continuous_pid = frame_buffer_.InsertFrame(std::move(frame));
if (last_continuous_pid != -1)
return last_continuous_pid;
return absl::nullopt;
}
void UpdateRtt(int64_t max_rtt_ms) override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
frame_buffer_.UpdateRtt(max_rtt_ms);
}
void StartNextDecode(bool keyframe_required) override {
if (!decode_queue_->IsCurrent()) {
decode_queue_->PostTask(SafeTask(
decode_safety_,
[this, keyframe_required] { StartNextDecode(keyframe_required); }));
return;
}
RTC_DCHECK_RUN_ON(decode_queue_);
frame_buffer_.NextFrame(
MaxWait(keyframe_required).ms(), keyframe_required, decode_queue_,
/* encoded frame handler */
[this, keyframe_required](std::unique_ptr<EncodedFrame> frame) {
RTC_DCHECK_RUN_ON(decode_queue_);
if (!decode_safety_->alive())
return;
if (frame) {
receiver_->OnEncodedFrame(std::move(frame));
} else {
receiver_->OnDecodableFrameTimeout(MaxWait(keyframe_required));
}
});
}
int Size() override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
return frame_buffer_.Size();
}
private:
TimeDelta MaxWait(bool keyframe_required) const {
return keyframe_required ? max_wait_for_keyframe_ : max_wait_for_frame_;
}
RTC_NO_UNIQUE_ADDRESS SequenceChecker worker_sequence_checker_;
const TimeDelta max_wait_for_keyframe_;
const TimeDelta max_wait_for_frame_;
video_coding::FrameBuffer frame_buffer_;
rtc::TaskQueue* const decode_queue_;
VCMReceiveStatisticsCallback* const stats_proxy_;
FrameSchedulingReceiver* const receiver_;
rtc::scoped_refptr<PendingTaskSafetyFlag> decode_safety_ =
PendingTaskSafetyFlag::CreateDetached();
};
// Max number of frames the buffer will hold.
static constexpr size_t kMaxFramesBuffered = 800;
// Max number of decoded frame info that will be saved.
static constexpr int kMaxFramesHistory = 1 << 13;
// Default value for the maximum decode queue size that is used when the
// low-latency renderer is used.
static constexpr size_t kZeroPlayoutDelayDefaultMaxDecodeQueueSize = 8;
struct FrameMetadata {
explicit FrameMetadata(const EncodedFrame& frame)
: is_last_spatial_layer(frame.is_last_spatial_layer),
is_keyframe(frame.is_keyframe()),
size(frame.size()),
contentType(frame.contentType()),
delayed_by_retransmission(frame.delayed_by_retransmission()),
rtp_timestamp(frame.Timestamp()),
receive_time(frame.ReceivedTimestamp()) {}
const bool is_last_spatial_layer;
const bool is_keyframe;
const size_t size;
const VideoContentType contentType;
const bool delayed_by_retransmission;
const uint32_t rtp_timestamp;
const absl::optional<Timestamp> receive_time;
};
Timestamp ReceiveTime(const EncodedFrame& frame) {
absl::optional<Timestamp> ts = frame.ReceivedTimestamp();
RTC_DCHECK(ts.has_value()) << "Received frame must have a timestamp set!";
return *ts;
}
// Encapsulates use of the new frame buffer for use in
// VideoReceiveStreamInterface. This behaves the same as the FrameBuffer2Proxy
// but uses frame_buffer instead. Responsibilities from frame_buffer2, like
// stats, jitter and frame timing accounting are moved into this pro
class FrameBuffer3Proxy : public FrameBufferProxy {
public:
FrameBuffer3Proxy(
Clock* clock,
TaskQueueBase* worker_queue,
VCMTiming* timing,
VCMReceiveStatisticsCallback* stats_proxy,
rtc::TaskQueue* decode_queue,
FrameSchedulingReceiver* receiver,
TimeDelta max_wait_for_keyframe,
TimeDelta max_wait_for_frame,
std::unique_ptr<FrameDecodeScheduler> frame_decode_scheduler,
const FieldTrialsView& field_trials)
: field_trials_(field_trials),
clock_(clock),
worker_queue_(worker_queue),
decode_queue_(decode_queue),
stats_proxy_(stats_proxy),
receiver_(receiver),
timing_(timing),
frame_decode_scheduler_(std::move(frame_decode_scheduler)),
jitter_estimator_(clock_, field_trials),
buffer_(std::make_unique<FrameBuffer>(kMaxFramesBuffered,
kMaxFramesHistory,
field_trials)),
decode_timing_(clock_, timing_),
timeout_tracker_(clock_,
worker_queue_,
VideoReceiveStreamTimeoutTracker::Timeouts{
.max_wait_for_keyframe = max_wait_for_keyframe,
.max_wait_for_frame = max_wait_for_frame},
absl::bind_front(&FrameBuffer3Proxy::OnTimeout, this)),
zero_playout_delay_max_decode_queue_size_(
"max_decode_queue_size",
kZeroPlayoutDelayDefaultMaxDecodeQueueSize) {
RTC_DCHECK(decode_queue_);
RTC_DCHECK(stats_proxy_);
RTC_DCHECK(receiver_);
RTC_DCHECK(timing_);
RTC_DCHECK(worker_queue_);
RTC_DCHECK(clock_);
RTC_DCHECK(frame_decode_scheduler_);
RTC_LOG(LS_WARNING) << "Using FrameBuffer3";
ParseFieldTrial({&zero_playout_delay_max_decode_queue_size_},
field_trials.Lookup("WebRTC-ZeroPlayoutDelay"));
}
// FrameBufferProxy implementation.
void StopOnWorker() override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
frame_decode_scheduler_->Stop();
timeout_tracker_.Stop();
decoder_ready_for_new_frame_ = false;
decode_queue_->PostTask([this] {
RTC_DCHECK_RUN_ON(decode_queue_);
decode_safety_->SetNotAlive();
});
}
void SetProtectionMode(VCMVideoProtection protection_mode) override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
protection_mode_ = kProtectionNackFEC;
}
void Clear() override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
stats_proxy_->OnDroppedFrames(buffer_->CurrentSize());
buffer_ = std::make_unique<FrameBuffer>(kMaxFramesBuffered,
kMaxFramesHistory, field_trials_);
frame_decode_scheduler_->CancelOutstanding();
}
absl::optional<int64_t> InsertFrame(
std::unique_ptr<EncodedFrame> frame) override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
FrameMetadata metadata(*frame);
int complete_units = buffer_->GetTotalNumberOfContinuousTemporalUnits();
if (buffer_->InsertFrame(std::move(frame))) {
RTC_DCHECK(metadata.receive_time) << "Frame receive time must be set!";
if (!metadata.delayed_by_retransmission && metadata.receive_time)
timing_->IncomingTimestamp(metadata.rtp_timestamp,
*metadata.receive_time);
if (complete_units < buffer_->GetTotalNumberOfContinuousTemporalUnits()) {
stats_proxy_->OnCompleteFrame(metadata.is_keyframe, metadata.size,
metadata.contentType);
MaybeScheduleFrameForRelease();
}
}
return buffer_->LastContinuousFrameId();
}
void UpdateRtt(int64_t max_rtt_ms) override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
jitter_estimator_.UpdateRtt(TimeDelta::Millis(max_rtt_ms));
}
void StartNextDecode(bool keyframe_required) override {
if (!worker_queue_->IsCurrent()) {
worker_queue_->PostTask(SafeTask(
worker_safety_.flag(),
[this, keyframe_required] { StartNextDecode(keyframe_required); }));
return;
}
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
if (!timeout_tracker_.Running())
timeout_tracker_.Start(keyframe_required);
keyframe_required_ = keyframe_required;
if (keyframe_required_) {
timeout_tracker_.SetWaitingForKeyframe();
}
decoder_ready_for_new_frame_ = true;
MaybeScheduleFrameForRelease();
}
int Size() override {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
return buffer_->CurrentSize();
}
void OnFrameReady(
absl::InlinedVector<std::unique_ptr<EncodedFrame>, 4> frames,
Timestamp render_time) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
RTC_DCHECK(!frames.empty());
timeout_tracker_.OnEncodedFrameReleased();
Timestamp now = clock_->CurrentTime();
bool superframe_delayed_by_retransmission = false;
DataSize superframe_size = DataSize::Zero();
const EncodedFrame& first_frame = *frames.front();
Timestamp receive_time = ReceiveTime(first_frame);
if (first_frame.is_keyframe())
keyframe_required_ = false;
// Gracefully handle bad RTP timestamps and render time issues.
if (FrameHasBadRenderTiming(render_time, now,
timing_->TargetVideoDelay())) {
jitter_estimator_.Reset();
timing_->Reset();
render_time = timing_->RenderTime(first_frame.Timestamp(), now);
}
for (std::unique_ptr<EncodedFrame>& frame : frames) {
frame->SetRenderTime(render_time.ms());
superframe_delayed_by_retransmission |=
frame->delayed_by_retransmission();
receive_time = std::max(receive_time, ReceiveTime(*frame));
superframe_size += DataSize::Bytes(frame->size());
}
if (!superframe_delayed_by_retransmission) {
auto frame_delay = inter_frame_delay_.CalculateDelay(
first_frame.Timestamp(), receive_time);
if (frame_delay) {
jitter_estimator_.UpdateEstimate(*frame_delay, superframe_size);
}
float rtt_mult = protection_mode_ == kProtectionNackFEC ? 0.0 : 1.0;
absl::optional<TimeDelta> rtt_mult_add_cap_ms = absl::nullopt;
if (rtt_mult_settings_.has_value()) {
rtt_mult = rtt_mult_settings_->rtt_mult_setting;
rtt_mult_add_cap_ms =
TimeDelta::Millis(rtt_mult_settings_->rtt_mult_add_cap_ms);
}
timing_->SetJitterDelay(
jitter_estimator_.GetJitterEstimate(rtt_mult, rtt_mult_add_cap_ms));
timing_->UpdateCurrentDelay(render_time, now);
} else if (RttMultExperiment::RttMultEnabled()) {
jitter_estimator_.FrameNacked();
}
// Update stats.
UpdateDroppedFrames();
UpdateJitterDelay();
UpdateTimingFrameInfo();
std::unique_ptr<EncodedFrame> frame =
CombineAndDeleteFrames(std::move(frames));
timing_->SetLastDecodeScheduledTimestamp(now);
decoder_ready_for_new_frame_ = false;
// VideoReceiveStream2 wants frames on the decoder thread.
decode_queue_->PostTask(
SafeTask(decode_safety_, [this, frame = std::move(frame)]() mutable {
receiver_->OnEncodedFrame(std::move(frame));
}));
}
void OnTimeout(TimeDelta delay) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
// If the stream is paused then ignore the timeout.
if (!decoder_ready_for_new_frame_) {
timeout_tracker_.Stop();
return;
}
receiver_->OnDecodableFrameTimeout(delay);
// Stop sending timeouts until receive starts waiting for a new frame.
timeout_tracker_.Stop();
decoder_ready_for_new_frame_ = false;
}
private:
void FrameReadyForDecode(uint32_t rtp_timestamp, Timestamp render_time) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
auto frames = buffer_->ExtractNextDecodableTemporalUnit();
RTC_DCHECK(frames[0]->Timestamp() == rtp_timestamp)
<< "Frame buffer's next decodable frame was not the one sent for "
"extraction rtp="
<< rtp_timestamp << " extracted rtp=" << frames[0]->Timestamp();
OnFrameReady(std::move(frames), render_time);
}
void UpdateDroppedFrames() RTC_RUN_ON(&worker_sequence_checker_) {
const int dropped_frames = buffer_->GetTotalNumberOfDroppedFrames() -
frames_dropped_before_last_new_frame_;
if (dropped_frames > 0)
stats_proxy_->OnDroppedFrames(dropped_frames);
frames_dropped_before_last_new_frame_ =
buffer_->GetTotalNumberOfDroppedFrames();
}
void UpdateJitterDelay() {
auto timings = timing_->GetTimings();
if (timings.num_decoded_frames) {
stats_proxy_->OnFrameBufferTimingsUpdated(
timings.max_decode_duration.ms(), timings.current_delay.ms(),
timings.target_delay.ms(), timings.jitter_buffer_delay.ms(),
timings.min_playout_delay.ms(), timings.render_delay.ms());
}
}
void UpdateTimingFrameInfo() {
absl::optional<TimingFrameInfo> info = timing_->GetTimingFrameInfo();
if (info)
stats_proxy_->OnTimingFrameInfoUpdated(*info);
}
bool IsTooManyFramesQueued() const RTC_RUN_ON(&worker_sequence_checker_) {
return buffer_->CurrentSize() > zero_playout_delay_max_decode_queue_size_;
}
void ForceKeyFrameReleaseImmediately() RTC_RUN_ON(&worker_sequence_checker_) {
RTC_DCHECK(keyframe_required_);
// Iterate through the frame buffer until there is a complete keyframe and
// release this right away.
while (buffer_->DecodableTemporalUnitsInfo()) {
auto next_frame = buffer_->ExtractNextDecodableTemporalUnit();
if (next_frame.empty()) {
RTC_DCHECK_NOTREACHED()
<< "Frame buffer should always return at least 1 frame.";
continue;
}
// Found keyframe - decode right away.
if (next_frame.front()->is_keyframe()) {
auto render_time = timing_->RenderTime(next_frame.front()->Timestamp(),
clock_->CurrentTime());
OnFrameReady(std::move(next_frame), render_time);
return;
}
}
}
void MaybeScheduleFrameForRelease() RTC_RUN_ON(&worker_sequence_checker_) {
auto decodable_tu_info = buffer_->DecodableTemporalUnitsInfo();
if (!decoder_ready_for_new_frame_ || !decodable_tu_info) {
return;
}
if (keyframe_required_) {
return ForceKeyFrameReleaseImmediately();
}
// If already scheduled then abort.
if (frame_decode_scheduler_->ScheduledRtpTimestamp() ==
decodable_tu_info->next_rtp_timestamp) {
return;
}
TimeDelta max_wait = timeout_tracker_.TimeUntilTimeout();
// Ensures the frame is scheduled for decode before the stream times out.
// This is otherwise a race condition.
max_wait = std::max(max_wait - TimeDelta::Millis(1), TimeDelta::Zero());
absl::optional<FrameDecodeTiming::FrameSchedule> schedule;
while (decodable_tu_info) {
schedule = decode_timing_.OnFrameBufferUpdated(
decodable_tu_info->next_rtp_timestamp,
decodable_tu_info->last_rtp_timestamp, max_wait,
IsTooManyFramesQueued());
if (schedule) {
// Don't schedule if already waiting for the same frame.
if (frame_decode_scheduler_->ScheduledRtpTimestamp() !=
decodable_tu_info->next_rtp_timestamp) {
frame_decode_scheduler_->CancelOutstanding();
frame_decode_scheduler_->ScheduleFrame(
decodable_tu_info->next_rtp_timestamp, *schedule,
absl::bind_front(&FrameBuffer3Proxy::FrameReadyForDecode, this));
}
return;
}
// If no schedule for current rtp, drop and try again.
buffer_->DropNextDecodableTemporalUnit();
decodable_tu_info = buffer_->DecodableTemporalUnitsInfo();
}
}
RTC_NO_UNIQUE_ADDRESS SequenceChecker worker_sequence_checker_;
const FieldTrialsView& field_trials_;
const absl::optional<RttMultExperiment::Settings> rtt_mult_settings_ =
RttMultExperiment::GetRttMultValue();
Clock* const clock_;
TaskQueueBase* const worker_queue_;
rtc::TaskQueue* const decode_queue_;
VCMReceiveStatisticsCallback* const stats_proxy_;
FrameSchedulingReceiver* const receiver_;
VCMTiming* const timing_;
const std::unique_ptr<FrameDecodeScheduler> frame_decode_scheduler_
RTC_GUARDED_BY(&worker_sequence_checker_);
JitterEstimator jitter_estimator_ RTC_GUARDED_BY(&worker_sequence_checker_);
InterFrameDelay inter_frame_delay_ RTC_GUARDED_BY(&worker_sequence_checker_);
bool keyframe_required_ RTC_GUARDED_BY(&worker_sequence_checker_) = false;
std::unique_ptr<FrameBuffer> buffer_
RTC_GUARDED_BY(&worker_sequence_checker_);
FrameDecodeTiming decode_timing_ RTC_GUARDED_BY(&worker_sequence_checker_);
VideoReceiveStreamTimeoutTracker timeout_tracker_
RTC_GUARDED_BY(&worker_sequence_checker_);
int frames_dropped_before_last_new_frame_
RTC_GUARDED_BY(&worker_sequence_checker_) = 0;
VCMVideoProtection protection_mode_
RTC_GUARDED_BY(&worker_sequence_checker_) = kProtectionNack;
// This flag guards frames from queuing in front of the decoder. Without this
// guard, encoded frames will not wait for the decoder to finish decoding a
// frame and just queue up, meaning frames will not be dropped or
// fast-forwarded when the decoder is slow or hangs.
bool decoder_ready_for_new_frame_ RTC_GUARDED_BY(&worker_sequence_checker_) =
false;
// Maximum number of frames in the decode queue to allow pacing. If the
// queue grows beyond the max limit, pacing will be disabled and frames will
// be pushed to the decoder as soon as possible. This only has an effect
// when the low-latency rendering path is active, which is indicated by
// the frame's render time == 0.
FieldTrialParameter<unsigned> zero_playout_delay_max_decode_queue_size_;
rtc::scoped_refptr<PendingTaskSafetyFlag> decode_safety_ =
PendingTaskSafetyFlag::CreateDetached();
ScopedTaskSafety worker_safety_;
};
enum class FrameBufferArm {
kFrameBuffer2,
kFrameBuffer3,
kSyncDecode,
};
constexpr const char* kFrameBufferFieldTrial = "WebRTC-FrameBuffer3";
FrameBufferArm ParseFrameBufferFieldTrial(const FieldTrialsView& field_trials) {
webrtc::FieldTrialEnum<FrameBufferArm> arm(
"arm", FrameBufferArm::kFrameBuffer2,
{
{"FrameBuffer2", FrameBufferArm::kFrameBuffer2},
{"FrameBuffer3", FrameBufferArm::kFrameBuffer3},
{"SyncDecoding", FrameBufferArm::kSyncDecode},
});
ParseFieldTrial({&arm}, field_trials.Lookup(kFrameBufferFieldTrial));
return arm.Get();
}
} // namespace
std::unique_ptr<FrameBufferProxy> FrameBufferProxy::CreateFromFieldTrial(
Clock* clock,
TaskQueueBase* worker_queue,
VCMTiming* timing,
VCMReceiveStatisticsCallback* stats_proxy,
rtc::TaskQueue* decode_queue,
FrameSchedulingReceiver* receiver,
TimeDelta max_wait_for_keyframe,
TimeDelta max_wait_for_frame,
DecodeSynchronizer* decode_sync,
const FieldTrialsView& field_trials) {
switch (ParseFrameBufferFieldTrial(field_trials)) {
case FrameBufferArm::kFrameBuffer2:
return std::make_unique<FrameBuffer2Proxy>(
clock, timing, stats_proxy, decode_queue, receiver,
max_wait_for_keyframe, max_wait_for_frame, field_trials);
case FrameBufferArm::kSyncDecode: {
std::unique_ptr<FrameDecodeScheduler> scheduler;
if (decode_sync) {
scheduler = decode_sync->CreateSynchronizedFrameScheduler();
} else {
RTC_LOG(LS_ERROR) << "In FrameBuffer with sync decode trial, but "
"no DecodeSynchronizer was present!";
// Crash in debug, but in production use the task queue scheduler.
RTC_DCHECK_NOTREACHED();
scheduler = std::make_unique<TaskQueueFrameDecodeScheduler>(
clock, worker_queue);
}
return std::make_unique<FrameBuffer3Proxy>(
clock, worker_queue, timing, stats_proxy, decode_queue, receiver,
max_wait_for_keyframe, max_wait_for_frame, std::move(scheduler),
field_trials);
}
case FrameBufferArm::kFrameBuffer3:
ABSL_FALLTHROUGH_INTENDED;
default: {
auto scheduler =
std::make_unique<TaskQueueFrameDecodeScheduler>(clock, worker_queue);
return std::make_unique<FrameBuffer3Proxy>(
clock, worker_queue, timing, stats_proxy, decode_queue, receiver,
max_wait_for_keyframe, max_wait_for_frame, std::move(scheduler),
field_trials);
}
}
}
} // namespace webrtc
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