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71 lines
2.6 KiB
C++
71 lines
2.6 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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#if !defined(MediaMetadataManager_h__)
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#define MediaMetadataManager_h__
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#include "VideoUtils.h"
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#include "mozilla/LinkedList.h"
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#include "AbstractMediaDecoder.h"
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#include "nsAutoPtr.h"
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namespace mozilla {
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// A struct that contains the metadata of a media, and the time at which those
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// metadata should start to be reported.
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class TimedMetadata : public LinkedListElement<TimedMetadata> {
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public:
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// The time, in microseconds, at which those metadata should be available.
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int64_t mPublishTime;
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// The metadata. The ownership is transfered to the element when dispatching to
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// the main threads.
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nsAutoPtr<MetadataTags> mTags;
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// The sample rate of this media.
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int mRate;
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// The number of channel of this media.
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int mChannels;
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// True if this media has an audio track.
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bool mHasAudio;
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// True if this media has a video track.
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bool mHasVideo;
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};
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// This class encapsulate the logic to give the metadata from the reader to
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// the content, at the right time.
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class MediaMetadataManager
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{
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public:
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~MediaMetadataManager() {
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TimedMetadata* element;
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while((element = mMetadataQueue.popFirst()) != nullptr) {
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delete element;
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}
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}
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void QueueMetadata(TimedMetadata* aMetadata) {
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mMetadataQueue.insertBack(aMetadata);
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}
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void DispatchMetadataIfNeeded(AbstractMediaDecoder* aDecoder, double aCurrentTime) {
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TimedMetadata* metadata = mMetadataQueue.getFirst();
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while (metadata && aCurrentTime >= static_cast<double>(metadata->mPublishTime) / USECS_PER_S) {
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nsCOMPtr<nsIRunnable> metadataUpdatedEvent =
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new mozilla::AudioMetadataEventRunner(aDecoder,
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metadata->mChannels,
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metadata->mRate,
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metadata->mHasAudio,
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metadata->mHasVideo,
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metadata->mTags.forget());
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NS_DispatchToMainThread(metadataUpdatedEvent, NS_DISPATCH_NORMAL);
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mMetadataQueue.popFirst();
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metadata = mMetadataQueue.getFirst();
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}
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}
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protected:
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LinkedList<TimedMetadata> mMetadataQueue;
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};
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}
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#endif
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