зеркало из https://github.com/mozilla/gecko-dev.git
98 строки
3.4 KiB
C++
98 строки
3.4 KiB
C++
/* -*- 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/. */
|
|
|
|
#if !defined(MediaMetadataManager_h__)
|
|
# define MediaMetadataManager_h__
|
|
|
|
# include "mozilla/AbstractThread.h"
|
|
# include "mozilla/LinkedList.h"
|
|
|
|
# include "MediaEventSource.h"
|
|
# include "TimeUnits.h"
|
|
# include "VideoUtils.h"
|
|
|
|
namespace mozilla {
|
|
|
|
class TimedMetadata;
|
|
typedef MediaEventProducerExc<TimedMetadata> TimedMetadataEventProducer;
|
|
typedef MediaEventSourceExc<TimedMetadata> TimedMetadataEventSource;
|
|
|
|
// A struct that contains the metadata of a media, and the time at which those
|
|
// metadata should start to be reported.
|
|
class TimedMetadata : public LinkedListElement<TimedMetadata> {
|
|
public:
|
|
TimedMetadata(const media::TimeUnit& aPublishTime,
|
|
UniquePtr<MetadataTags>&& aTags, UniquePtr<MediaInfo>&& aInfo)
|
|
: mPublishTime(aPublishTime),
|
|
mTags(std::move(aTags)),
|
|
mInfo(std::move(aInfo)) {}
|
|
|
|
// Define our move constructor because we don't want to move the members of
|
|
// LinkedListElement to change the list.
|
|
TimedMetadata(TimedMetadata&& aOther)
|
|
: mPublishTime(aOther.mPublishTime),
|
|
mTags(std::move(aOther.mTags)),
|
|
mInfo(std::move(aOther.mInfo)) {}
|
|
|
|
// The time, in microseconds, at which those metadata should be available.
|
|
media::TimeUnit mPublishTime;
|
|
// The metadata. The ownership is transfered to the element when dispatching
|
|
// to the main threads.
|
|
UniquePtr<MetadataTags> mTags;
|
|
// The media info, including the info of audio tracks and video tracks.
|
|
// The ownership is transfered to MediaDecoder when dispatching to the
|
|
// main thread.
|
|
UniquePtr<MediaInfo> mInfo;
|
|
};
|
|
|
|
// This class encapsulate the logic to give the metadata from the reader to
|
|
// the content, at the right time.
|
|
class MediaMetadataManager {
|
|
public:
|
|
~MediaMetadataManager() {
|
|
TimedMetadata* element;
|
|
while ((element = mMetadataQueue.popFirst()) != nullptr) {
|
|
delete element;
|
|
}
|
|
}
|
|
|
|
// Connect to an event source to receive TimedMetadata events.
|
|
void Connect(TimedMetadataEventSource& aEvent, AbstractThread* aThread) {
|
|
mListener =
|
|
aEvent.Connect(aThread, this, &MediaMetadataManager::OnMetadataQueued);
|
|
}
|
|
|
|
// Stop receiving TimedMetadata events.
|
|
void Disconnect() { mListener.Disconnect(); }
|
|
|
|
// Return an event source through which we will send TimedMetadata events
|
|
// when playback position reaches the publish time.
|
|
TimedMetadataEventSource& TimedMetadataEvent() { return mTimedMetadataEvent; }
|
|
|
|
void DispatchMetadataIfNeeded(const media::TimeUnit& aCurrentTime) {
|
|
TimedMetadata* metadata = mMetadataQueue.getFirst();
|
|
while (metadata && aCurrentTime >= metadata->mPublishTime) {
|
|
// Our listener will figure out what to do with TimedMetadata.
|
|
mTimedMetadataEvent.Notify(std::move(*metadata));
|
|
delete mMetadataQueue.popFirst();
|
|
metadata = mMetadataQueue.getFirst();
|
|
}
|
|
}
|
|
|
|
protected:
|
|
void OnMetadataQueued(TimedMetadata&& aMetadata) {
|
|
mMetadataQueue.insertBack(new TimedMetadata(std::move(aMetadata)));
|
|
}
|
|
|
|
LinkedList<TimedMetadata> mMetadataQueue;
|
|
MediaEventListener mListener;
|
|
TimedMetadataEventProducer mTimedMetadataEvent;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif
|