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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_ENCODER_BASE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_ENCODER_BASE_H_
#include <memory>
#include "media/base/encoder_status.h"
#include "media/base/media_log.h"
#include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_codec_state.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_webcodecs_error_callback.h"
#include "third_party/blink/renderer/modules/event_target_modules.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/webcodecs/codec_logger.h"
#include "third_party/blink/renderer/modules/webcodecs/codec_trace_names.h"
#include "third_party/blink/renderer/modules/webcodecs/reclaimable_codec.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/context_lifecycle_observer.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_deque.h"
#include "third_party/blink/renderer/platform/heap/visitor.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace blink {
class ExceptionState;
enum class DOMExceptionCode;
template <typename Traits>
class MODULES_EXPORT EncoderBase
: public EventTarget,
public ActiveScriptWrappable<EncoderBase<Traits>>,
public ReclaimableCodec {
public:
using InitType = typename Traits::Init;
using ConfigType = typename Traits::Config;
using InternalConfigType = typename Traits::InternalConfig;
using InputType = typename Traits::Input;
using EncodeOptionsType = typename Traits::EncodeOptions;
using OutputChunkType = typename Traits::OutputChunk;
using OutputCallbackType = typename Traits::OutputCallback;
using MediaEncoderType = typename Traits::MediaEncoder;
static const CodecTraceNames* GetTraceNames();
EncoderBase(ScriptState*, const InitType*, ExceptionState&);
~EncoderBase() override;
// *_encoder.idl implementation.
uint32_t encodeQueueSize() { return requested_encodes_; }
DEFINE_ATTRIBUTE_EVENT_LISTENER(dequeue, kDequeue)
void configure(const ConfigType*, ExceptionState&);
void encode(InputType* input,
const EncodeOptionsType* opts,
ExceptionState& exception_state);
ScriptPromise<IDLUndefined> flush(ExceptionState&);
void reset(ExceptionState&);
void close(ExceptionState&);
V8CodecState state() { return state_; }
// EventTarget override.
ExecutionContext* GetExecutionContext() const override;
// ExecutionContextLifecycleObserver override.
void ContextDestroyed() override;
// ScriptWrappable override.
bool HasPendingActivity() const override;
// GarbageCollected override.
void Trace(Visitor*) const override;
protected:
struct Request final : public GarbageCollected<Request> {
enum class Type {
// Configure an encoder from scratch, possibly replacing the existing one.
kConfigure,
// Adjust options in the already configured encoder.
kReconfigure,
kEncode,
kFlush,
};
void Trace(Visitor*) const;
// Starts an async trace event.
void StartTracing();
// Starts an async encode trace.
void StartTracingVideoEncode(bool is_keyframe, base::TimeDelta timestamp);
// Ends the async trace event associated with |this|.
void EndTracing(bool aborted = false);
// Get a trace event name from DecoderTemplate::GetTraceNames() and |type|.
const char* TraceNameFromType();
Type type;
// Current value of EncoderBase.reset_count_ when request was created.
uint32_t reset_count = 0;
Member<InputType> input; // used by kEncode
Member<const EncodeOptionsType> encodeOpts; // used by kEncode
// used by kFlush
Member<ScriptPromiseResolver<IDLUndefined>> resolver;
Member<InternalConfigType> config; // used by kConfigure and kReconfigure
#if DCHECK_IS_ON()
// Tracks the state of tracing for debug purposes.
bool is_tracing;
#endif
};
void QueueHandleError(DOMException* ex);
virtual void HandleError(DOMException* ex);
virtual void EnqueueRequest(Request* request);
virtual void ProcessRequests();
virtual bool ReadyToProcessNextRequest();
virtual void ProcessEncode(Request* request) = 0;
virtual void ProcessConfigure(Request* request) = 0;
virtual void ProcessReconfigure(Request* request) = 0;
virtual void ProcessFlush(Request* request);
virtual void ResetInternal(DOMException* ex);
virtual bool CanReconfigure(InternalConfigType& original_config,
InternalConfigType& new_config) = 0;
virtual InternalConfigType* OnNewConfigure(const ConfigType*,
ExceptionState&) = 0;
virtual bool VerifyCodecSupport(InternalConfigType*,
String* js_error_message) = 0;
// Called for each new input passed to encode(). If an exception is thrown on
// `exception_state` the encode() call will be aborted and the exception will
// be passed back to the caller.
virtual void OnNewEncode(InputType* input,
ExceptionState& exception_state) = 0;
// ReclaimableCodec implementation.
void OnCodecReclaimed(DOMException*) override;
void TraceQueueSizes() const;
void ScheduleDequeueEvent();
void DispatchDequeueEvent(Event* event);
bool dequeue_event_pending_ = false;
std::unique_ptr<CodecLogger<media::EncoderStatus>> logger_;
std::unique_ptr<MediaEncoderType> media_encoder_;
V8CodecState state_;
Member<InternalConfigType> active_config_;
Member<ScriptState> script_state_;
Member<OutputCallbackType> output_callback_;
Member<V8WebCodecsErrorCallback> error_callback_;
HeapDeque<Member<Request>> requests_;
uint32_t requested_encodes_ = 0;
// How many times reset() was called on the encoder. It's used to decide
// when a callback needs to be dismissed because reset() was called between
// an operation and its callback.
uint32_t reset_count_ = 0;
// Some kConfigure and kFlush requests can't be executed in parallel with
// kEncode. Even some kEncode might have synchronous parts like readback.
//
// Set this to stop processing of new requests in `requests_` until the
// current request is finished.
//
// During reset(), this member is used to reject any pending promises.
Member<Request> blocking_request_in_progress_;
bool first_output_after_configure_ = true;
// Used to differentiate Encoders' counters during tracing.
int trace_counter_id_;
// A runner for callbacks and deleting objects.
scoped_refptr<base::SingleThreadTaskRunner> callback_runner_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_ENCODER_BASE_H_
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