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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/peerconnection/rtc_rtp_script_transformer.h"
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
#include "base/unguessable_token.h"
#include "third_party/blink/renderer/bindings/core/v8/idl_types.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/core/messaging/message_port.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_rtp_script_transform.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
namespace blink {
namespace {
void HandleSendKeyFrameRequestResult(
ScriptPromiseResolver<IDLUndefined>* resolver,
const RTCRtpScriptTransform::SendKeyFrameRequestResult result) {
CHECK(!resolver->GetExecutionContext() ||
resolver->GetExecutionContext()->IsContextThread());
String message;
switch (result) {
case RTCRtpScriptTransform::SendKeyFrameRequestResult::kNoReceiver:
message = "Not attached to a receiver.";
break;
case RTCRtpScriptTransform::SendKeyFrameRequestResult::kNoVideo:
message = "The kind of the receiver is not video.";
break;
case RTCRtpScriptTransform::SendKeyFrameRequestResult::kInvalidState:
message = "Invalid state.";
break;
case RTCRtpScriptTransform::SendKeyFrameRequestResult::kTrackEnded:
message = "The receiver track is ended.";
break;
case RTCRtpScriptTransform::SendKeyFrameRequestResult::kSuccess:
resolver->Resolve();
return;
}
resolver->RejectWithDOMException(DOMExceptionCode::kInvalidStateError,
message);
}
} // namespace
RTCRtpScriptTransformer::RTCRtpScriptTransformer(
ScriptState* script_state,
CustomEventMessage options,
scoped_refptr<base::SequencedTaskRunner> transform_task_runner,
CrossThreadWeakHandle<RTCRtpScriptTransform> transform)
: rtp_transformer_task_runner_(
ExecutionContext::From(script_state)
->GetTaskRunner(TaskType::kInternalMediaRealTime)),
rtp_transform_task_runner_(transform_task_runner),
data_as_serialized_script_value_(
SerializedScriptValue::Unpack(std::move(options.message))),
serialized_data_memory_accounter_(V8ExternalMemoryAccounter()),
ports_(MessagePort::EntanglePorts(*ExecutionContext::From(script_state),
std::move(options.ports))),
transform_(std::move(transform)),
rtc_encoded_underlying_source_(
MakeGarbageCollected<RTCEncodedUnderlyingSourceWrapper>(
script_state)),
rtc_encoded_underlying_sink_(
MakeGarbageCollected<RTCEncodedUnderlyingSinkWrapper>(script_state)) {
// scope is needed because this call may not come directly from JavaScript,
// and ReadableStream::CreateWithCountQueueingStrategy requires entering the
// ScriptState.
ScriptState::Scope scope(script_state);
readable_ = ReadableStream::CreateWithCountQueueingStrategy(
script_state, rtc_encoded_underlying_source_,
/*high_water_mark=*/0);
// The high water mark for the stream is set to 1 so that the stream seems
// ready to write, but without queuing frames.
writable_ = WritableStream::CreateWithCountQueueingStrategy(
script_state, rtc_encoded_underlying_sink_,
/*high_water_mark=*/1);
serialized_data_memory_accounter_.Increase(v8::Isolate::GetCurrent(),
SizeOfExternalMemoryInBytes());
}
RTCRtpScriptTransformer::~RTCRtpScriptTransformer() {
serialized_data_memory_accounter_.Clear(v8::Isolate::GetCurrent());
}
size_t RTCRtpScriptTransformer::SizeOfExternalMemoryInBytes() {
if (!data_as_serialized_script_value_) {
return 0;
}
size_t result = 0;
for (auto const& array_buffer :
data_as_serialized_script_value_->ArrayBuffers()) {
result += array_buffer->ByteLength();
}
return result;
}
void RTCRtpScriptTransformer::Trace(Visitor* visitor) const {
ScriptWrappable::Trace(visitor);
visitor->Trace(data_as_serialized_script_value_);
visitor->Trace(ports_);
visitor->Trace(readable_);
visitor->Trace(writable_);
visitor->Trace(rtc_encoded_underlying_source_);
visitor->Trace(rtc_encoded_underlying_sink_);
}
// Relies on [CachedAttribute] to ensure it isn't run more than once.
ScriptValue RTCRtpScriptTransformer::options(ScriptState* script_state) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
MessagePortArray message_ports =
ports_ ? MessagePortArray(*ports_) : MessagePortArray();
SerializedScriptValue::DeserializeOptions options;
options.message_ports = &message_ports;
v8::Isolate* isolate = script_state->GetIsolate();
v8::Local<v8::Value> value;
if (data_as_serialized_script_value_) {
// The data is put on the V8 GC heap here, and therefore the V8 GC does
// the accounting from here on. We unregister the registered memory to
// avoid double accounting.
serialized_data_memory_accounter_.Clear(isolate);
value = data_as_serialized_script_value_->Deserialize(isolate, options);
} else {
value = v8::Null(isolate);
}
return ScriptValue(isolate, value);
}
ScriptPromise<IDLUndefined> RTCRtpScriptTransformer::sendKeyFrameRequest(
ScriptState* script_state) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<IDLUndefined>>(script_state);
auto promise = resolver->Promise();
PostCrossThreadTask(
*rtp_transform_task_runner_, FROM_HERE,
CrossThreadBindOnce(
&RTCRtpScriptTransform::SendKeyFrameRequestToReceiver,
MakeUnwrappingCrossThreadWeakHandle(*transform_),
CrossThreadBindRepeating(&HandleSendKeyFrameRequestResult,
MakeUnwrappingCrossThreadHandle(resolver))));
return promise;
}
bool RTCRtpScriptTransformer::IsOptionsDirty() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return false;
}
void RTCRtpScriptTransformer::SetUpAudio(
WTF::CrossThreadOnceClosure disconnect_callback_source,
scoped_refptr<blink::RTCEncodedAudioStreamTransformer::Broker>
encoded_audio_transformer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::UnguessableToken owner_id = base::UnguessableToken::Create();
rtc_encoded_underlying_source_->CreateAudioUnderlyingSource(
std::move(disconnect_callback_source), owner_id);
encoded_audio_transformer->SetTransformerCallback(
rtc_encoded_underlying_source_->GetAudioTransformer());
encoded_audio_transformer->SetSourceTaskRunner(rtp_transformer_task_runner_);
rtc_encoded_underlying_sink_->CreateAudioUnderlyingSink(
std::move(encoded_audio_transformer), owner_id);
}
void RTCRtpScriptTransformer::SetUpVideo(
WTF::CrossThreadOnceClosure disconnect_callback_source,
scoped_refptr<blink::RTCEncodedVideoStreamTransformer::Broker>
encoded_video_transformer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::UnguessableToken owner_id = base::UnguessableToken::Create();
rtc_encoded_underlying_source_->CreateVideoUnderlyingSource(
std::move(disconnect_callback_source), owner_id);
encoded_video_transformer->SetTransformerCallback(
rtc_encoded_underlying_source_->GetVideoTransformer());
encoded_video_transformer->SetSourceTaskRunner(rtp_transformer_task_runner_);
rtc_encoded_underlying_sink_->CreateVideoUnderlyingSink(
std::move(encoded_video_transformer), owner_id);
}
void RTCRtpScriptTransformer::Clear() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
rtc_encoded_underlying_source_->Clear();
rtc_encoded_underlying_sink_->Clear();
}
} // namespace blink
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