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Using a template type, ConfigType, in EncoderAgent::Configure requires a template implementation. Instead of defining the implementation somewehre, taking a `EncoderConfig` in `EncoderAgent` makes it easier to add a EncoderTemplate implementation in the future, as long as the `ConfigTypeInternal` comes with a `ToEncoderConfig()` method. Differential Revision: https://phabricator.services.mozilla.com/D197023
116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_MEDIA_WEBCODECS_EncoderAgent_H
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#define DOM_MEDIA_WEBCODECS_EncoderAgent_H
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#include "MediaResult.h"
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#include "PlatformEncoderModule.h"
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#include "PEMFactory.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/TaskQueue.h"
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#include "WebCodecsUtils.h"
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class nsISerialEventTarget;
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namespace mozilla {
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class PDMFactory;
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class TrackInfo;
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namespace layers {
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class ImageContainer;
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} // namespace layers
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// EncoderAgent is a wrapper that contains a MediaDataEncoder. It adapts the
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// MediaDataEncoder APIs for use in WebCodecs.
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//
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// If Configure() is called, Shutdown() must be called to release the resources
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// gracefully. Except Shutdown(), all the methods can't be called concurrently,
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// meaning a method can only be called when the previous API call has completed.
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// The responsability of arranging the method calls is on the caller.
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//
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// When Shutdown() is called, all the operations in flight are canceled and the
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// MediaDataEncoder is shut down. On the other hand, errors are final. A new
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// EncoderAgent must be created when an error is encountered.
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//
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// All the methods need to be called on the EncoderAgent's owner thread. In
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// WebCodecs, it's either on the main thread or worker thread.
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class EncoderAgent final {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(EncoderAgent);
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explicit EncoderAgent(WebCodecsId aId);
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// The following APIs are owner thread only.
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using ConfigurePromise = MozPromise<bool, MediaResult, true /* exclusive */>;
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using ReconfigurationPromise = MediaDataEncoder::ReconfigurationPromise;
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RefPtr<ConfigurePromise> Configure(const EncoderConfig& aConfig);
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RefPtr<ReconfigurationPromise> Reconfigure(
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const RefPtr<const EncoderConfigurationChangeList>& aConfigChange);
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RefPtr<ShutdownPromise> Shutdown();
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using EncodePromise = MediaDataEncoder::EncodePromise;
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RefPtr<EncodePromise> Encode(MediaData* aInput);
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// WebCodecs's flush() flushes out all the pending encoded data in the
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// encoder. It's called Drain internally.
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RefPtr<EncodePromise> Drain();
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const WebCodecsId mId;
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private:
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~EncoderAgent();
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// Push out all the data in the MediaDataEncoder's pipeline.
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// TODO: MediaDataEncoder should implement this, instead of asking call site
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// to run `Drain` multiple times.
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RefPtr<EncodePromise> Dry();
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void DryUntilDrain();
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enum class State {
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Unconfigured,
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Configuring,
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Configured,
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Encoding,
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Flushing,
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ShuttingDown,
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Error,
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};
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void SetState(State aState);
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const RefPtr<nsISerialEventTarget> mOwnerThread;
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const RefPtr<PEMFactory> mPEMFactory;
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RefPtr<MediaDataEncoder> mEncoder;
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State mState;
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// Configure
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MozPromiseHolder<ConfigurePromise> mConfigurePromise;
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using CreateEncoderPromise = PlatformEncoderModule::CreateEncoderPromise;
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MozPromiseRequestHolder<CreateEncoderPromise> mCreateRequest;
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using InitPromise = MediaDataEncoder::InitPromise;
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MozPromiseRequestHolder<InitPromise> mInitRequest;
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// Reconfigure
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MozPromiseHolder<ReconfigurationPromise> mReconfigurationPromise;
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using ReconfigureEncoderRequest = ReconfigurationPromise;
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MozPromiseRequestHolder<ReconfigureEncoderRequest> mReconfigurationRequest;
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// Shutdown
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MozPromiseHolder<ShutdownPromise> mShutdownWhileCreationPromise;
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// Encoding
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MozPromiseHolder<EncodePromise> mEncodePromise;
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MozPromiseRequestHolder<EncodePromise> mEncodeRequest;
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// Drain
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MozPromiseRequestHolder<EncodePromise> mDrainRequest;
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MozPromiseHolder<EncodePromise> mDrainPromise;
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MediaDataEncoder::EncodedData mDrainData;
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};
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} // namespace mozilla
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#endif // DOM_MEDIA_WEBCODECS_EncoderAgent_H
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