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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 "modules/rtp_rtcp/source/rtp_video_stream_receiver_frame_transformer_delegate.h"
#include <string>
#include <utility>
#include <vector>
#include "absl/memory/memory.h"
#include "modules/rtp_rtcp/source/rtp_descriptor_authentication.h"
#include "rtc_base/checks.h"
#include "rtc_base/thread.h"
namespace webrtc {
namespace {
class TransformableVideoReceiverFrame
: public TransformableVideoFrameInterface {
public:
TransformableVideoReceiverFrame(std::unique_ptr<RtpFrameObject> frame,
uint32_t ssrc,
RtpVideoFrameReceiver* receiver)
: frame_(std::move(frame)),
metadata_(frame_->GetRtpVideoHeader().GetAsMetadata()),
receiver_(receiver) {
metadata_.SetSsrc(ssrc);
metadata_.SetCsrcs(frame_->Csrcs());
}
~TransformableVideoReceiverFrame() override = default;
// Implements TransformableVideoFrameInterface.
rtc::ArrayView<const uint8_t> GetData() const override {
return *frame_->GetEncodedData();
}
void SetData(rtc::ArrayView<const uint8_t> data) override {
frame_->SetEncodedData(
EncodedImageBuffer::Create(data.data(), data.size()));
}
uint8_t GetPayloadType() const override { return frame_->PayloadType(); }
uint32_t GetSsrc() const override { return Metadata().GetSsrc(); }
uint32_t GetTimestamp() const override { return frame_->RtpTimestamp(); }
void SetRTPTimestamp(uint32_t timestamp) override {
frame_->SetRtpTimestamp(timestamp);
}
bool IsKeyFrame() const override {
return frame_->FrameType() == VideoFrameType::kVideoFrameKey;
}
const std::string& GetRid() const override {
static const std::string empty;
return empty;
}
VideoFrameMetadata Metadata() const override { return metadata_; }
void SetMetadata(const VideoFrameMetadata& metadata) override {
// Create |new_metadata| from existing metadata and change only frameId and
// dependencies.
VideoFrameMetadata new_metadata = Metadata();
new_metadata.SetFrameId(metadata.GetFrameId());
new_metadata.SetFrameDependencies(metadata.GetFrameDependencies());
RTC_DCHECK(new_metadata == metadata)
<< "TransformableVideoReceiverFrame::SetMetadata can be only used to "
"change frameID and dependencies";
frame_->SetHeaderFromMetadata(new_metadata);
}
std::unique_ptr<RtpFrameObject> ExtractFrame() && {
return std::move(frame_);
}
Direction GetDirection() const override { return Direction::kReceiver; }
std::string GetMimeType() const override {
std::string mime_type = "video/";
return mime_type + CodecTypeToPayloadString(frame_->codec_type());
}
const RtpVideoFrameReceiver* Receiver() { return receiver_; }
private:
std::unique_ptr<RtpFrameObject> frame_;
VideoFrameMetadata metadata_;
RtpVideoFrameReceiver* receiver_;
};
} // namespace
RtpVideoStreamReceiverFrameTransformerDelegate::
RtpVideoStreamReceiverFrameTransformerDelegate(
RtpVideoFrameReceiver* receiver,
Clock* clock,
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
TaskQueueBase* network_thread, uint32_t ssrc)
: receiver_(receiver),
frame_transformer_(std::move(frame_transformer)),
network_thread_(network_thread),
ssrc_(ssrc),
clock_(clock) {}
void RtpVideoStreamReceiverFrameTransformerDelegate::Init() {
RTC_DCHECK_RUN_ON(&network_sequence_checker_);
frame_transformer_->RegisterTransformedFrameSinkCallback(
rtc::scoped_refptr<TransformedFrameCallback>(this), ssrc_);
}
void RtpVideoStreamReceiverFrameTransformerDelegate::Reset() {
RTC_DCHECK_RUN_ON(&network_sequence_checker_);
frame_transformer_->UnregisterTransformedFrameSinkCallback(ssrc_);
frame_transformer_ = nullptr;
receiver_ = nullptr;
}
void RtpVideoStreamReceiverFrameTransformerDelegate::TransformFrame(
std::unique_ptr<RtpFrameObject> frame) {
RTC_DCHECK_RUN_ON(&network_sequence_checker_);
frame_transformer_->Transform(
std::make_unique<TransformableVideoReceiverFrame>(std::move(frame), ssrc_,
receiver_));
}
void RtpVideoStreamReceiverFrameTransformerDelegate::OnTransformedFrame(
std::unique_ptr<TransformableFrameInterface> frame) {
rtc::scoped_refptr<RtpVideoStreamReceiverFrameTransformerDelegate> delegate(
this);
network_thread_->PostTask(
[delegate = std::move(delegate), frame = std::move(frame)]() mutable {
delegate->ManageFrame(std::move(frame));
});
}
void RtpVideoStreamReceiverFrameTransformerDelegate::ManageFrame(
std::unique_ptr<TransformableFrameInterface> frame) {
RTC_DCHECK_RUN_ON(&network_sequence_checker_);
if (!receiver_)
return;
if (frame->GetDirection() ==
TransformableFrameInterface::Direction::kReceiver) {
auto transformed_frame = absl::WrapUnique(
static_cast<TransformableVideoReceiverFrame*>(frame.release()));
auto frame_receiver = transformed_frame->Receiver();
std::unique_ptr<RtpFrameObject> frame_object =
std::move(*transformed_frame).ExtractFrame();
if (frame_receiver != receiver_) {
// This frame was received by a different RtpReceiver instance, so has
// first and last sequence numbers which will be meaningless to our
// receiver_. Work around this by using the frame id as a surrogate value,
// same as when given a Sender frame below.
// TODO(https://crbug.com/1250638): Change what happens after the encoded
// insertable stream insertion to not require RTP data.
frame_object->SetFirstSeqNum(frame_object->Id());
frame_object->SetLastSeqNum(frame_object->Id());
}
receiver_->ManageFrame(std::move(frame_object));
} else {
RTC_CHECK_EQ(frame->GetDirection(),
TransformableFrameInterface::Direction::kSender);
// This frame is actually an frame encoded locally, to be sent, but has been
// fed back into this receiver's insertable stream writer.
// Create a reasonable RtpFrameObject as if this frame had been received
// over RTP, reusing the frameId as an analog for the RTP sequence number,
// and handle it as if it had been received.
// TODO(https://crbug.com/1250638): Rewrite the receiver's codepaths after
// this transform to be transport-agnostic and not need a faked rtp
// sequence number.
auto transformed_frame = absl::WrapUnique(
static_cast<TransformableVideoFrameInterface*>(frame.release()));
VideoFrameMetadata metadata = transformed_frame->Metadata();
RTPVideoHeader video_header = RTPVideoHeader::FromMetadata(metadata);
VideoSendTiming timing;
rtc::ArrayView<const uint8_t> data = transformed_frame->GetData();
int64_t receive_time = clock_->CurrentTime().ms();
receiver_->ManageFrame(std::make_unique<RtpFrameObject>(
/*first_seq_num=*/metadata.GetFrameId().value_or(0),
/*last_seq_num=*/metadata.GetFrameId().value_or(0),
/*markerBit=*/video_header.is_last_frame_in_picture,
/*times_nacked=*/0,
/*first_packet_received_time=*/receive_time,
/*last_packet_received_time=*/receive_time,
/*rtp_timestamp=*/transformed_frame->GetTimestamp(),
/*ntp_time_ms=*/0, timing, transformed_frame->GetPayloadType(),
metadata.GetCodec(), metadata.GetRotation(), metadata.GetContentType(),
video_header, video_header.color_space, RtpPacketInfos(),
EncodedImageBuffer::Create(data.data(), data.size())));
}
}
} // namespace webrtc
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