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Nagram/TMessagesProj/jni/voip/webrtc/video/video_receive_stream2.cc
DrKLO d52b2c921a Update to 7.3.0 (2195)
2020-12-23 11:48:30 +04:00

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/*
* Copyright (c) 2020 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/video_receive_stream2.h"
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include "absl/algorithm/container.h"
#include "absl/types/optional.h"
#include "api/array_view.h"
#include "api/crypto/frame_decryptor_interface.h"
#include "api/video/encoded_image.h"
#include "api/video_codecs/sdp_video_format.h"
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/video_decoder_factory.h"
#include "api/video_codecs/video_encoder.h"
#include "call/rtp_stream_receiver_controller_interface.h"
#include "call/rtx_receive_stream.h"
#include "common_video/include/incoming_video_stream.h"
#include "media/base/h264_profile_level_id.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/include/video_coding_defines.h"
#include "modules/video_coding/include/video_error_codes.h"
#include "modules/video_coding/timing.h"
#include "modules/video_coding/utility/vp8_header_parser.h"
#include "rtc_base/checks.h"
#include "rtc_base/experiments/keyframe_interval_settings.h"
#include "rtc_base/location.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/system/thread_registry.h"
#include "rtc_base/time_utils.h"
#include "rtc_base/trace_event.h"
#include "system_wrappers/include/clock.h"
#include "system_wrappers/include/field_trial.h"
#include "video/call_stats2.h"
#include "video/frame_dumping_decoder.h"
#include "video/receive_statistics_proxy2.h"
namespace webrtc {
namespace internal {
constexpr int VideoReceiveStream2::kMaxWaitForKeyFrameMs;
namespace {
using video_coding::EncodedFrame;
using ReturnReason = video_coding::FrameBuffer::ReturnReason;
constexpr int kMinBaseMinimumDelayMs = 0;
constexpr int kMaxBaseMinimumDelayMs = 10000;
constexpr int kMaxWaitForFrameMs = 3000;
// Concrete instance of RecordableEncodedFrame wrapping needed content
// from video_coding::EncodedFrame.
class WebRtcRecordableEncodedFrame : public RecordableEncodedFrame {
public:
explicit WebRtcRecordableEncodedFrame(const EncodedFrame& frame)
: buffer_(frame.GetEncodedData()),
render_time_ms_(frame.RenderTime()),
codec_(frame.CodecSpecific()->codecType),
is_key_frame_(frame.FrameType() == VideoFrameType::kVideoFrameKey),
resolution_{frame.EncodedImage()._encodedWidth,
frame.EncodedImage()._encodedHeight} {
if (frame.ColorSpace()) {
color_space_ = *frame.ColorSpace();
}
}
// VideoEncodedSinkInterface::FrameBuffer
rtc::scoped_refptr<const EncodedImageBufferInterface> encoded_buffer()
const override {
return buffer_;
}
absl::optional<webrtc::ColorSpace> color_space() const override {
return color_space_;
}
VideoCodecType codec() const override { return codec_; }
bool is_key_frame() const override { return is_key_frame_; }
EncodedResolution resolution() const override { return resolution_; }
Timestamp render_time() const override {
return Timestamp::Millis(render_time_ms_);
}
private:
rtc::scoped_refptr<EncodedImageBufferInterface> buffer_;
int64_t render_time_ms_;
VideoCodecType codec_;
bool is_key_frame_;
EncodedResolution resolution_;
absl::optional<webrtc::ColorSpace> color_space_;
};
VideoCodec CreateDecoderVideoCodec(const VideoReceiveStream::Decoder& decoder) {
VideoCodec codec;
codec.codecType = PayloadStringToCodecType(decoder.video_format.name);
if (codec.codecType == kVideoCodecVP8) {
*(codec.VP8()) = VideoEncoder::GetDefaultVp8Settings();
} else if (codec.codecType == kVideoCodecVP9) {
*(codec.VP9()) = VideoEncoder::GetDefaultVp9Settings();
} else if (codec.codecType == kVideoCodecH264) {
*(codec.H264()) = VideoEncoder::GetDefaultH264Settings();
} else if (codec.codecType == kVideoCodecMultiplex) {
VideoReceiveStream::Decoder associated_decoder = decoder;
associated_decoder.video_format =
SdpVideoFormat(CodecTypeToPayloadString(kVideoCodecVP9));
VideoCodec associated_codec = CreateDecoderVideoCodec(associated_decoder);
associated_codec.codecType = kVideoCodecMultiplex;
return associated_codec;
}
FieldTrialOptional<int> width("w");
FieldTrialOptional<int> height("h");
ParseFieldTrial(
{&width, &height},
field_trial::FindFullName("WebRTC-Video-InitialDecoderResolution"));
if (width && height) {
codec.width = width.Value();
codec.height = height.Value();
} else {
codec.width = 320;
codec.height = 180;
}
const int kDefaultStartBitrate = 300;
codec.startBitrate = codec.minBitrate = codec.maxBitrate =
kDefaultStartBitrate;
return codec;
}
// Video decoder class to be used for unknown codecs. Doesn't support decoding
// but logs messages to LS_ERROR.
class NullVideoDecoder : public webrtc::VideoDecoder {
public:
int32_t InitDecode(const webrtc::VideoCodec* codec_settings,
int32_t number_of_cores) override {
RTC_LOG(LS_ERROR) << "Can't initialize NullVideoDecoder.";
return WEBRTC_VIDEO_CODEC_OK;
}
int32_t Decode(const webrtc::EncodedImage& input_image,
bool missing_frames,
int64_t render_time_ms) override {
RTC_LOG(LS_ERROR) << "The NullVideoDecoder doesn't support decoding.";
return WEBRTC_VIDEO_CODEC_OK;
}
int32_t RegisterDecodeCompleteCallback(
webrtc::DecodedImageCallback* callback) override {
RTC_LOG(LS_ERROR)
<< "Can't register decode complete callback on NullVideoDecoder.";
return WEBRTC_VIDEO_CODEC_OK;
}
int32_t Release() override { return WEBRTC_VIDEO_CODEC_OK; }
const char* ImplementationName() const override { return "NullVideoDecoder"; }
};
// TODO(https://bugs.webrtc.org/9974): Consider removing this workaround.
// Maximum time between frames before resetting the FrameBuffer to avoid RTP
// timestamps wraparound to affect FrameBuffer.
constexpr int kInactiveStreamThresholdMs = 600000; // 10 minutes.
} // namespace
VideoReceiveStream2::VideoReceiveStream2(
TaskQueueFactory* task_queue_factory,
TaskQueueBase* current_queue,
RtpStreamReceiverControllerInterface* receiver_controller,
int num_cpu_cores,
PacketRouter* packet_router,
VideoReceiveStream::Config config,
ProcessThread* process_thread,
CallStats* call_stats,
Clock* clock,
VCMTiming* timing)
: task_queue_factory_(task_queue_factory),
transport_adapter_(config.rtcp_send_transport),
config_(std::move(config)),
num_cpu_cores_(num_cpu_cores),
worker_thread_(current_queue),
clock_(clock),
call_stats_(call_stats),
source_tracker_(clock_),
stats_proxy_(&config_, clock_, worker_thread_),
rtp_receive_statistics_(ReceiveStatistics::Create(clock_)),
timing_(timing),
video_receiver_(clock_, timing_.get()),
rtp_video_stream_receiver_(worker_thread_,
clock_,
&transport_adapter_,
call_stats->AsRtcpRttStats(),
packet_router,
&config_,
rtp_receive_statistics_.get(),
&stats_proxy_,
&stats_proxy_,
process_thread,
this, // NackSender
nullptr, // Use default KeyFrameRequestSender
this, // OnCompleteFrameCallback
config_.frame_decryptor,
config_.frame_transformer),
rtp_stream_sync_(current_queue, this),
max_wait_for_keyframe_ms_(KeyframeIntervalSettings::ParseFromFieldTrials()
.MaxWaitForKeyframeMs()
.value_or(kMaxWaitForKeyFrameMs)),
max_wait_for_frame_ms_(KeyframeIntervalSettings::ParseFromFieldTrials()
.MaxWaitForFrameMs()
.value_or(kMaxWaitForFrameMs)),
low_latency_renderer_enabled_("enabled", true),
low_latency_renderer_include_predecode_buffer_("include_predecode_buffer",
true),
decode_queue_(task_queue_factory_->CreateTaskQueue(
"DecodingQueue",
TaskQueueFactory::Priority::HIGH)) {
RTC_LOG(LS_INFO) << "VideoReceiveStream2: " << config_.ToString();
RTC_DCHECK(worker_thread_);
RTC_DCHECK(config_.renderer);
RTC_DCHECK(call_stats_);
module_process_sequence_checker_.Detach();
RTC_DCHECK(!config_.decoders.empty());
RTC_CHECK(config_.decoder_factory);
std::set<int> decoder_payload_types;
for (const Decoder& decoder : config_.decoders) {
RTC_CHECK(decoder_payload_types.find(decoder.payload_type) ==
decoder_payload_types.end())
<< "Duplicate payload type (" << decoder.payload_type
<< ") for different decoders.";
decoder_payload_types.insert(decoder.payload_type);
}
timing_->set_render_delay(config_.render_delay_ms);
frame_buffer_.reset(
new video_coding::FrameBuffer(clock_, timing_.get(), &stats_proxy_));
// Register with RtpStreamReceiverController.
media_receiver_ = receiver_controller->CreateReceiver(
config_.rtp.remote_ssrc, &rtp_video_stream_receiver_);
if (config_.rtp.rtx_ssrc) {
rtx_receive_stream_ = std::make_unique<RtxReceiveStream>(
&rtp_video_stream_receiver_, config.rtp.rtx_associated_payload_types,
config_.rtp.remote_ssrc, rtp_receive_statistics_.get());
rtx_receiver_ = receiver_controller->CreateReceiver(
config_.rtp.rtx_ssrc, rtx_receive_stream_.get());
} else {
rtp_receive_statistics_->EnableRetransmitDetection(config.rtp.remote_ssrc,
true);
}
ParseFieldTrial({&low_latency_renderer_enabled_,
&low_latency_renderer_include_predecode_buffer_},
field_trial::FindFullName("WebRTC-LowLatencyRenderer"));
}
VideoReceiveStream2::~VideoReceiveStream2() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
RTC_LOG(LS_INFO) << "~VideoReceiveStream2: " << config_.ToString();
Stop();
}
void VideoReceiveStream2::SignalNetworkState(NetworkState state) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
rtp_video_stream_receiver_.SignalNetworkState(state);
}
bool VideoReceiveStream2::DeliverRtcp(const uint8_t* packet, size_t length) {
return rtp_video_stream_receiver_.DeliverRtcp(packet, length);
}
void VideoReceiveStream2::SetSync(Syncable* audio_syncable) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
rtp_stream_sync_.ConfigureSync(audio_syncable);
}
void VideoReceiveStream2::Start() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
if (decoder_running_) {
return;
}
const bool protected_by_fec = config_.rtp.protected_by_flexfec ||
rtp_video_stream_receiver_.IsUlpfecEnabled();
if (rtp_video_stream_receiver_.IsRetransmissionsEnabled() &&
protected_by_fec) {
frame_buffer_->SetProtectionMode(kProtectionNackFEC);
}
transport_adapter_.Enable();
rtc::VideoSinkInterface<VideoFrame>* renderer = nullptr;
if (config_.enable_prerenderer_smoothing) {
incoming_video_stream_.reset(new IncomingVideoStream(
task_queue_factory_, config_.render_delay_ms, this));
renderer = incoming_video_stream_.get();
} else {
renderer = this;
}
for (const Decoder& decoder : config_.decoders) {
std::unique_ptr<VideoDecoder> video_decoder =
config_.decoder_factory->LegacyCreateVideoDecoder(decoder.video_format,
config_.stream_id);
// If we still have no valid decoder, we have to create a "Null" decoder
// that ignores all calls. The reason we can get into this state is that the
// old decoder factory interface doesn't have a way to query supported
// codecs.
if (!video_decoder) {
video_decoder = std::make_unique<NullVideoDecoder>();
}
std::string decoded_output_file =
field_trial::FindFullName("WebRTC-DecoderDataDumpDirectory");
// Because '/' can't be used inside a field trial parameter, we use ';'
// instead.
// This is only relevant to WebRTC-DecoderDataDumpDirectory
// field trial. ';' is chosen arbitrary. Even though it's a legal character
// in some file systems, we can sacrifice ability to use it in the path to
// dumped video, since it's developers-only feature for debugging.
absl::c_replace(decoded_output_file, ';', '/');
if (!decoded_output_file.empty()) {
char filename_buffer[256];
rtc::SimpleStringBuilder ssb(filename_buffer);
ssb << decoded_output_file << "/webrtc_receive_stream_"
<< this->config_.rtp.remote_ssrc << "-" << rtc::TimeMicros()
<< ".ivf";
video_decoder = CreateFrameDumpingDecoderWrapper(
std::move(video_decoder), FileWrapper::OpenWriteOnly(ssb.str()));
}
video_decoders_.push_back(std::move(video_decoder));
video_receiver_.RegisterExternalDecoder(video_decoders_.back().get(),
decoder.payload_type);
VideoCodec codec = CreateDecoderVideoCodec(decoder);
const bool raw_payload =
config_.rtp.raw_payload_types.count(decoder.payload_type) > 0;
rtp_video_stream_receiver_.AddReceiveCodec(decoder.payload_type, codec,
decoder.video_format.parameters,
raw_payload);
RTC_CHECK_EQ(VCM_OK, video_receiver_.RegisterReceiveCodec(
decoder.payload_type, &codec, num_cpu_cores_));
}
RTC_DCHECK(renderer != nullptr);
video_stream_decoder_.reset(
new VideoStreamDecoder(&video_receiver_, &stats_proxy_, renderer));
// Make sure we register as a stats observer *after* we've prepared the
// |video_stream_decoder_|.
call_stats_->RegisterStatsObserver(this);
// Start decoding on task queue.
video_receiver_.DecoderThreadStarting();
stats_proxy_.DecoderThreadStarting();
decode_queue_.PostTask([this] {
RTC_DCHECK_RUN_ON(&decode_queue_);
decoder_stopped_ = false;
StartNextDecode();
});
decoder_running_ = true;
rtp_video_stream_receiver_.StartReceive();
}
void VideoReceiveStream2::Stop() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
rtp_video_stream_receiver_.StopReceive();
stats_proxy_.OnUniqueFramesCounted(
rtp_video_stream_receiver_.GetUniqueFramesSeen());
decode_queue_.PostTask([this] { frame_buffer_->Stop(); });
call_stats_->DeregisterStatsObserver(this);
if (decoder_running_) {
rtc::Event done;
decode_queue_.PostTask([this, &done] {
RTC_DCHECK_RUN_ON(&decode_queue_);
decoder_stopped_ = true;
done.Set();
});
done.Wait(rtc::Event::kForever);
decoder_running_ = false;
video_receiver_.DecoderThreadStopped();
stats_proxy_.DecoderThreadStopped();
// Deregister external decoders so they are no longer running during
// destruction. This effectively stops the VCM since the decoder thread is
// stopped, the VCM is deregistered and no asynchronous decoder threads are
// running.
for (const Decoder& decoder : config_.decoders)
video_receiver_.RegisterExternalDecoder(nullptr, decoder.payload_type);
UpdateHistograms();
}
video_stream_decoder_.reset();
incoming_video_stream_.reset();
transport_adapter_.Disable();
}
VideoReceiveStream::Stats VideoReceiveStream2::GetStats() const {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
VideoReceiveStream2::Stats stats = stats_proxy_.GetStats();
stats.total_bitrate_bps = 0;
StreamStatistician* statistician =
rtp_receive_statistics_->GetStatistician(stats.ssrc);
if (statistician) {
stats.rtp_stats = statistician->GetStats();
stats.total_bitrate_bps = statistician->BitrateReceived();
}
if (config_.rtp.rtx_ssrc) {
StreamStatistician* rtx_statistician =
rtp_receive_statistics_->GetStatistician(config_.rtp.rtx_ssrc);
if (rtx_statistician)
stats.total_bitrate_bps += rtx_statistician->BitrateReceived();
}
return stats;
}
void VideoReceiveStream2::UpdateHistograms() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
absl::optional<int> fraction_lost;
StreamDataCounters rtp_stats;
StreamStatistician* statistician =
rtp_receive_statistics_->GetStatistician(config_.rtp.remote_ssrc);
if (statistician) {
fraction_lost = statistician->GetFractionLostInPercent();
rtp_stats = statistician->GetReceiveStreamDataCounters();
}
if (config_.rtp.rtx_ssrc) {
StreamStatistician* rtx_statistician =
rtp_receive_statistics_->GetStatistician(config_.rtp.rtx_ssrc);
if (rtx_statistician) {
StreamDataCounters rtx_stats =
rtx_statistician->GetReceiveStreamDataCounters();
stats_proxy_.UpdateHistograms(fraction_lost, rtp_stats, &rtx_stats);
return;
}
}
stats_proxy_.UpdateHistograms(fraction_lost, rtp_stats, nullptr);
}
void VideoReceiveStream2::AddSecondarySink(RtpPacketSinkInterface* sink) {
rtp_video_stream_receiver_.AddSecondarySink(sink);
}
void VideoReceiveStream2::RemoveSecondarySink(
const RtpPacketSinkInterface* sink) {
rtp_video_stream_receiver_.RemoveSecondarySink(sink);
}
bool VideoReceiveStream2::SetBaseMinimumPlayoutDelayMs(int delay_ms) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
if (delay_ms < kMinBaseMinimumDelayMs || delay_ms > kMaxBaseMinimumDelayMs) {
return false;
}
base_minimum_playout_delay_ms_ = delay_ms;
UpdatePlayoutDelays();
return true;
}
int VideoReceiveStream2::GetBaseMinimumPlayoutDelayMs() const {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
return base_minimum_playout_delay_ms_;
}
void VideoReceiveStream2::OnFrame(const VideoFrame& video_frame) {
VideoFrameMetaData frame_meta(video_frame, clock_->CurrentTime());
worker_thread_->PostTask(
ToQueuedTask(task_safety_, [frame_meta, this]() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
int64_t video_playout_ntp_ms;
int64_t sync_offset_ms;
double estimated_freq_khz;
if (rtp_stream_sync_.GetStreamSyncOffsetInMs(
frame_meta.rtp_timestamp, frame_meta.render_time_ms(),
&video_playout_ntp_ms, &sync_offset_ms, &estimated_freq_khz)) {
stats_proxy_.OnSyncOffsetUpdated(video_playout_ntp_ms, sync_offset_ms,
estimated_freq_khz);
}
stats_proxy_.OnRenderedFrame(frame_meta);
}));
source_tracker_.OnFrameDelivered(video_frame.packet_infos());
config_.renderer->OnFrame(video_frame);
}
void VideoReceiveStream2::SetFrameDecryptor(
rtc::scoped_refptr<webrtc::FrameDecryptorInterface> frame_decryptor) {
rtp_video_stream_receiver_.SetFrameDecryptor(std::move(frame_decryptor));
}
void VideoReceiveStream2::SetDepacketizerToDecoderFrameTransformer(
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer) {
rtp_video_stream_receiver_.SetDepacketizerToDecoderFrameTransformer(
std::move(frame_transformer));
}
void VideoReceiveStream2::SendNack(
const std::vector<uint16_t>& sequence_numbers,
bool buffering_allowed) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
RTC_DCHECK(buffering_allowed);
rtp_video_stream_receiver_.RequestPacketRetransmit(sequence_numbers);
}
void VideoReceiveStream2::RequestKeyFrame(int64_t timestamp_ms) {
// Running on worker_sequence_checker_.
// Called from RtpVideoStreamReceiver (rtp_video_stream_receiver_ is
// ultimately responsible).
rtp_video_stream_receiver_.RequestKeyFrame();
decode_queue_.PostTask([this, timestamp_ms]() {
RTC_DCHECK_RUN_ON(&decode_queue_);
last_keyframe_request_ms_ = timestamp_ms;
});
}
void VideoReceiveStream2::OnCompleteFrame(
std::unique_ptr<video_coding::EncodedFrame> frame) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
// TODO(https://bugs.webrtc.org/9974): Consider removing this workaround.
int64_t time_now_ms = clock_->TimeInMilliseconds();
if (last_complete_frame_time_ms_ > 0 &&
time_now_ms - last_complete_frame_time_ms_ > kInactiveStreamThresholdMs) {
frame_buffer_->Clear();
}
last_complete_frame_time_ms_ = time_now_ms;
const VideoPlayoutDelay& playout_delay = frame->EncodedImage().playout_delay_;
if (playout_delay.min_ms >= 0) {
frame_minimum_playout_delay_ms_ = playout_delay.min_ms;
UpdatePlayoutDelays();
}
if (playout_delay.max_ms >= 0) {
frame_maximum_playout_delay_ms_ = playout_delay.max_ms;
UpdatePlayoutDelays();
}
int64_t last_continuous_pid = frame_buffer_->InsertFrame(std::move(frame));
if (last_continuous_pid != -1)
rtp_video_stream_receiver_.FrameContinuous(last_continuous_pid);
}
void VideoReceiveStream2::OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
frame_buffer_->UpdateRtt(max_rtt_ms);
rtp_video_stream_receiver_.UpdateRtt(max_rtt_ms);
stats_proxy_.OnRttUpdate(avg_rtt_ms);
}
uint32_t VideoReceiveStream2::id() const {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
return config_.rtp.remote_ssrc;
}
absl::optional<Syncable::Info> VideoReceiveStream2::GetInfo() const {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
absl::optional<Syncable::Info> info =
rtp_video_stream_receiver_.GetSyncInfo();
if (!info)
return absl::nullopt;
info->current_delay_ms = timing_->TargetVideoDelay();
return info;
}
bool VideoReceiveStream2::GetPlayoutRtpTimestamp(uint32_t* rtp_timestamp,
int64_t* time_ms) const {
RTC_NOTREACHED();
return 0;
}
void VideoReceiveStream2::SetEstimatedPlayoutNtpTimestampMs(
int64_t ntp_timestamp_ms,
int64_t time_ms) {
RTC_NOTREACHED();
}
bool VideoReceiveStream2::SetMinimumPlayoutDelay(int delay_ms) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
syncable_minimum_playout_delay_ms_ = delay_ms;
UpdatePlayoutDelays();
return true;
}
int64_t VideoReceiveStream2::GetMaxWaitMs() const {
return keyframe_required_ ? max_wait_for_keyframe_ms_
: max_wait_for_frame_ms_;
}
void VideoReceiveStream2::StartNextDecode() {
// Running on the decode thread.
TRACE_EVENT0("webrtc", "VideoReceiveStream2::StartNextDecode");
frame_buffer_->NextFrame(
GetMaxWaitMs(), keyframe_required_, &decode_queue_,
/* encoded frame handler */
[this](std::unique_ptr<EncodedFrame> frame, ReturnReason res) {
RTC_DCHECK_EQ(frame == nullptr, res == ReturnReason::kTimeout);
RTC_DCHECK_EQ(frame != nullptr, res == ReturnReason::kFrameFound);
decode_queue_.PostTask([this, frame = std::move(frame)]() mutable {
RTC_DCHECK_RUN_ON(&decode_queue_);
if (decoder_stopped_)
return;
if (frame) {
HandleEncodedFrame(std::move(frame));
} else {
int64_t now_ms = clock_->TimeInMilliseconds();
worker_thread_->PostTask(ToQueuedTask(
task_safety_, [this, now_ms, wait_ms = GetMaxWaitMs()]() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
HandleFrameBufferTimeout(now_ms, wait_ms);
}));
}
StartNextDecode();
});
});
}
void VideoReceiveStream2::HandleEncodedFrame(
std::unique_ptr<EncodedFrame> frame) {
// Running on |decode_queue_|.
int64_t now_ms = clock_->TimeInMilliseconds();
// Current OnPreDecode only cares about QP for VP8.
int qp = -1;
if (frame->CodecSpecific()->codecType == kVideoCodecVP8) {
if (!vp8::GetQp(frame->data(), frame->size(), &qp)) {
RTC_LOG(LS_WARNING) << "Failed to extract QP from VP8 video frame";
}
}
stats_proxy_.OnPreDecode(frame->CodecSpecific()->codecType, qp);
bool force_request_key_frame = false;
int64_t decoded_frame_picture_id = -1;
const bool keyframe_request_is_due =
now_ms >= (last_keyframe_request_ms_ + max_wait_for_keyframe_ms_);
int decode_result = video_receiver_.Decode(frame.get());
if (decode_result == WEBRTC_VIDEO_CODEC_OK ||
decode_result == WEBRTC_VIDEO_CODEC_OK_REQUEST_KEYFRAME) {
keyframe_required_ = false;
frame_decoded_ = true;
decoded_frame_picture_id = frame->id.picture_id;
if (decode_result == WEBRTC_VIDEO_CODEC_OK_REQUEST_KEYFRAME)
force_request_key_frame = true;
} else if (!frame_decoded_ || !keyframe_required_ ||
keyframe_request_is_due) {
keyframe_required_ = true;
// TODO(philipel): Remove this keyframe request when downstream project
// has been fixed.
force_request_key_frame = true;
}
bool received_frame_is_keyframe =
frame->FrameType() == VideoFrameType::kVideoFrameKey;
worker_thread_->PostTask(ToQueuedTask(
task_safety_,
[this, now_ms, received_frame_is_keyframe, force_request_key_frame,
decoded_frame_picture_id, keyframe_request_is_due]() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
if (decoded_frame_picture_id != -1)
rtp_video_stream_receiver_.FrameDecoded(decoded_frame_picture_id);
HandleKeyFrameGeneration(received_frame_is_keyframe, now_ms,
force_request_key_frame,
keyframe_request_is_due);
}));
if (encoded_frame_buffer_function_) {
frame->Retain();
encoded_frame_buffer_function_(WebRtcRecordableEncodedFrame(*frame));
}
}
void VideoReceiveStream2::HandleKeyFrameGeneration(
bool received_frame_is_keyframe,
int64_t now_ms,
bool always_request_key_frame,
bool keyframe_request_is_due) {
// Running on worker_sequence_checker_.
bool request_key_frame = always_request_key_frame;
// Repeat sending keyframe requests if we've requested a keyframe.
if (keyframe_generation_requested_) {
if (received_frame_is_keyframe) {
keyframe_generation_requested_ = false;
} else if (keyframe_request_is_due) {
if (!IsReceivingKeyFrame(now_ms)) {
request_key_frame = true;
}
} else {
// It hasn't been long enough since the last keyframe request, do nothing.
}
}
if (request_key_frame) {
// HandleKeyFrameGeneration is initated from the decode thread -
// RequestKeyFrame() triggers a call back to the decode thread.
// Perhaps there's a way to avoid that.
RequestKeyFrame(now_ms);
}
}
void VideoReceiveStream2::HandleFrameBufferTimeout(int64_t now_ms,
int64_t wait_ms) {
// Running on |worker_sequence_checker_|.
absl::optional<int64_t> last_packet_ms =
rtp_video_stream_receiver_.LastReceivedPacketMs();
// To avoid spamming keyframe requests for a stream that is not active we
// check if we have received a packet within the last 5 seconds.
const bool stream_is_active =
last_packet_ms && now_ms - *last_packet_ms < 5000;
if (!stream_is_active)
stats_proxy_.OnStreamInactive();
if (stream_is_active && !IsReceivingKeyFrame(now_ms) &&
(!config_.crypto_options.sframe.require_frame_encryption ||
rtp_video_stream_receiver_.IsDecryptable())) {
RTC_LOG(LS_WARNING) << "No decodable frame in " << wait_ms
<< " ms, requesting keyframe.";
RequestKeyFrame(now_ms);
}
}
bool VideoReceiveStream2::IsReceivingKeyFrame(int64_t timestamp_ms) const {
// Running on worker_sequence_checker_.
absl::optional<int64_t> last_keyframe_packet_ms =
rtp_video_stream_receiver_.LastReceivedKeyframePacketMs();
// If we recently have been receiving packets belonging to a keyframe then
// we assume a keyframe is currently being received.
bool receiving_keyframe =
last_keyframe_packet_ms &&
timestamp_ms - *last_keyframe_packet_ms < max_wait_for_keyframe_ms_;
return receiving_keyframe;
}
void VideoReceiveStream2::UpdatePlayoutDelays() const {
// Running on worker_sequence_checker_.
const int minimum_delay_ms =
std::max({frame_minimum_playout_delay_ms_, base_minimum_playout_delay_ms_,
syncable_minimum_playout_delay_ms_});
if (minimum_delay_ms >= 0) {
timing_->set_min_playout_delay(minimum_delay_ms);
if (frame_minimum_playout_delay_ms_ == 0 &&
frame_maximum_playout_delay_ms_ > 0 && low_latency_renderer_enabled_) {
// TODO(kron): Estimate frame rate from video stream.
constexpr double kFrameRate = 60.0;
// Convert playout delay in ms to number of frames.
int max_composition_delay_in_frames = std::lrint(
static_cast<double>(frame_maximum_playout_delay_ms_ * kFrameRate) /
rtc::kNumMillisecsPerSec);
if (low_latency_renderer_include_predecode_buffer_) {
// Subtract frames in buffer.
max_composition_delay_in_frames = std::max<int16_t>(
max_composition_delay_in_frames - frame_buffer_->Size(), 0);
}
timing_->SetMaxCompositionDelayInFrames(
absl::make_optional(max_composition_delay_in_frames));
}
}
const int maximum_delay_ms = frame_maximum_playout_delay_ms_;
if (maximum_delay_ms >= 0) {
timing_->set_max_playout_delay(maximum_delay_ms);
}
}
std::vector<webrtc::RtpSource> VideoReceiveStream2::GetSources() const {
return source_tracker_.GetSources();
}
VideoReceiveStream2::RecordingState
VideoReceiveStream2::SetAndGetRecordingState(RecordingState state,
bool generate_key_frame) {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
rtc::Event event;
// Save old state, set the new state.
RecordingState old_state;
decode_queue_.PostTask(
[this, &event, &old_state, callback = std::move(state.callback),
generate_key_frame,
last_keyframe_request = state.last_keyframe_request_ms.value_or(0)] {
RTC_DCHECK_RUN_ON(&decode_queue_);
old_state.callback = std::move(encoded_frame_buffer_function_);
encoded_frame_buffer_function_ = std::move(callback);
old_state.last_keyframe_request_ms = last_keyframe_request_ms_;
last_keyframe_request_ms_ = generate_key_frame
? clock_->TimeInMilliseconds()
: last_keyframe_request;
event.Set();
});
old_state.keyframe_needed = keyframe_generation_requested_;
if (generate_key_frame) {
rtp_video_stream_receiver_.RequestKeyFrame();
keyframe_generation_requested_ = true;
} else {
keyframe_generation_requested_ = state.keyframe_needed;
}
event.Wait(rtc::Event::kForever);
return old_state;
}
void VideoReceiveStream2::GenerateKeyFrame() {
RTC_DCHECK_RUN_ON(&worker_sequence_checker_);
RequestKeyFrame(clock_->TimeInMilliseconds());
keyframe_generation_requested_ = true;
}
} // namespace internal
} // namespace webrtc
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