1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/MediaMetadataManager.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,70 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#if !defined(MediaMetadataManager_h__)
1.11 +#define MediaMetadataManager_h__
1.12 +#include "VideoUtils.h"
1.13 +#include "mozilla/LinkedList.h"
1.14 +#include "AbstractMediaDecoder.h"
1.15 +#include "nsAutoPtr.h"
1.16 +
1.17 +namespace mozilla {
1.18 +
1.19 + // A struct that contains the metadata of a media, and the time at which those
1.20 + // metadata should start to be reported.
1.21 + class TimedMetadata : public LinkedListElement<TimedMetadata> {
1.22 + public:
1.23 + // The time, in microseconds, at which those metadata should be available.
1.24 + int64_t mPublishTime;
1.25 + // The metadata. The ownership is transfered to the element when dispatching to
1.26 + // the main threads.
1.27 + nsAutoPtr<MetadataTags> mTags;
1.28 + // The sample rate of this media.
1.29 + int mRate;
1.30 + // The number of channel of this media.
1.31 + int mChannels;
1.32 + // True if this media has an audio track.
1.33 + bool mHasAudio;
1.34 + // True if this media has a video track.
1.35 + bool mHasVideo;
1.36 + };
1.37 +
1.38 + // This class encapsulate the logic to give the metadata from the reader to
1.39 + // the content, at the right time.
1.40 + class MediaMetadataManager
1.41 + {
1.42 + public:
1.43 + ~MediaMetadataManager() {
1.44 + TimedMetadata* element;
1.45 + while((element = mMetadataQueue.popFirst()) != nullptr) {
1.46 + delete element;
1.47 + }
1.48 + }
1.49 + void QueueMetadata(TimedMetadata* aMetadata) {
1.50 + mMetadataQueue.insertBack(aMetadata);
1.51 + }
1.52 +
1.53 + void DispatchMetadataIfNeeded(AbstractMediaDecoder* aDecoder, double aCurrentTime) {
1.54 + TimedMetadata* metadata = mMetadataQueue.getFirst();
1.55 + while (metadata && aCurrentTime >= static_cast<double>(metadata->mPublishTime) / USECS_PER_S) {
1.56 + nsCOMPtr<nsIRunnable> metadataUpdatedEvent =
1.57 + new AudioMetadataEventRunner(aDecoder,
1.58 + metadata->mChannels,
1.59 + metadata->mRate,
1.60 + metadata->mHasAudio,
1.61 + metadata->mHasVideo,
1.62 + metadata->mTags.forget());
1.63 + NS_DispatchToMainThread(metadataUpdatedEvent, NS_DISPATCH_NORMAL);
1.64 + delete mMetadataQueue.popFirst();
1.65 + metadata = mMetadataQueue.getFirst();
1.66 + }
1.67 + }
1.68 + protected:
1.69 + LinkedList<TimedMetadata> mMetadataQueue;
1.70 + };
1.71 +}
1.72 +
1.73 +#endif
