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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_MEDIA_WEBCODECS_EncoderAgent_H
#define DOM_MEDIA_WEBCODECS_EncoderAgent_H
#include "MediaResult.h"
#include "PlatformEncoderModule.h"
#include "PEMFactory.h"
#include "mozilla/RefPtr.h"
#include "mozilla/TaskQueue.h"
#include "WebCodecsUtils.h"
class nsISerialEventTarget;
namespace mozilla {
class PDMFactory;
class TrackInfo;
namespace layers {
class ImageContainer;
} // namespace layers
// EncoderAgent is a wrapper that contains a MediaDataEncoder. It adapts the
// MediaDataEncoder APIs for use in WebCodecs.
//
// If Configure() is called, Shutdown() must be called to release the resources
// gracefully. Except Shutdown(), all the methods can't be called concurrently,
// meaning a method can only be called when the previous API call has completed.
// The responsability of arranging the method calls is on the caller.
//
// When Shutdown() is called, all the operations in flight are canceled and the
// MediaDataEncoder is shut down. On the other hand, errors are final. A new
// EncoderAgent must be created when an error is encountered.
//
// All the methods need to be called on the EncoderAgent's owner thread. In
// WebCodecs, it's either on the main thread or worker thread.
class EncoderAgent final {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(EncoderAgent);
explicit EncoderAgent(WebCodecsId aId);
// The following APIs are owner thread only.
using ConfigurePromise = MozPromise<bool, MediaResult, true /* exclusive */>;
using ReconfigurationPromise = MediaDataEncoder::ReconfigurationPromise;
RefPtr<ConfigurePromise> Configure(const EncoderConfig& aConfig);
RefPtr<ReconfigurationPromise> Reconfigure(
const RefPtr<const EncoderConfigurationChangeList>& aConfigChange);
RefPtr<ShutdownPromise> Shutdown();
using EncodePromise = MediaDataEncoder::EncodePromise;
RefPtr<EncodePromise> Encode(MediaData* aInput);
// WebCodecs's flush() flushes out all the pending encoded data in the
// encoder. It's called Drain internally.
RefPtr<EncodePromise> Drain();
const WebCodecsId mId;
private:
~EncoderAgent();
// Push out all the data in the MediaDataEncoder's pipeline.
// TODO: MediaDataEncoder should implement this, instead of asking call site
// to run `Drain` multiple times.
RefPtr<EncodePromise> Dry();
void DryUntilDrain();
enum class State {
Unconfigured,
Configuring,
Configured,
Encoding,
Flushing,
ShuttingDown,
Error,
};
void SetState(State aState);
const RefPtr<nsISerialEventTarget> mOwnerThread;
const RefPtr<PEMFactory> mPEMFactory;
RefPtr<MediaDataEncoder> mEncoder;
State mState;
// Configure
MozPromiseHolder<ConfigurePromise> mConfigurePromise;
using CreateEncoderPromise = PlatformEncoderModule::CreateEncoderPromise;
MozPromiseRequestHolder<CreateEncoderPromise> mCreateRequest;
using InitPromise = MediaDataEncoder::InitPromise;
MozPromiseRequestHolder<InitPromise> mInitRequest;
// Reconfigure
MozPromiseHolder<ReconfigurationPromise> mReconfigurationPromise;
using ReconfigureEncoderRequest = ReconfigurationPromise;
MozPromiseRequestHolder<ReconfigureEncoderRequest> mReconfigurationRequest;
// Shutdown
MozPromiseHolder<ShutdownPromise> mShutdownWhileCreationPromise;
// Encoding
MozPromiseHolder<EncodePromise> mEncodePromise;
MozPromiseRequestHolder<EncodePromise> mEncodeRequest;
// Drain
MozPromiseRequestHolder<EncodePromise> mDrainRequest;
MozPromiseHolder<EncodePromise> mDrainPromise;
MediaDataEncoder::EncodedData mDrainData;
};
} // namespace mozilla
#endif // DOM_MEDIA_WEBCODECS_EncoderAgent_H
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