michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #if !defined(MediaMetadataManager_h__)
michael@0: #define MediaMetadataManager_h__
michael@0: #include "VideoUtils.h"
michael@0: #include "mozilla/LinkedList.h"
michael@0: #include "AbstractMediaDecoder.h"
michael@0: #include "nsAutoPtr.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0:   // A struct that contains the metadata of a media, and the time at which those
michael@0:   // metadata should start to be reported.
michael@0:   class TimedMetadata : public LinkedListElement<TimedMetadata> {
michael@0:     public:
michael@0:       // The time, in microseconds, at which those metadata should be available.
michael@0:       int64_t mPublishTime;
michael@0:       // The metadata. The ownership is transfered to the element when dispatching to
michael@0:       // the main threads.
michael@0:       nsAutoPtr<MetadataTags> mTags;
michael@0:       // The sample rate of this media.
michael@0:       int mRate;
michael@0:       // The number of channel of this media.
michael@0:       int mChannels;
michael@0:       // True if this media has an audio track.
michael@0:       bool mHasAudio;
michael@0:       // True if this media has a video track.
michael@0:       bool mHasVideo;
michael@0:   };
michael@0: 
michael@0:   // This class encapsulate the logic to give the metadata from the reader to
michael@0:   // the content, at the right time.
michael@0:   class MediaMetadataManager
michael@0:   {
michael@0:     public:
michael@0:       ~MediaMetadataManager() {
michael@0:         TimedMetadata* element;
michael@0:         while((element = mMetadataQueue.popFirst()) != nullptr) {
michael@0:           delete element;
michael@0:         }
michael@0:       }
michael@0:       void QueueMetadata(TimedMetadata* aMetadata) {
michael@0:         mMetadataQueue.insertBack(aMetadata);
michael@0:       }
michael@0: 
michael@0:       void DispatchMetadataIfNeeded(AbstractMediaDecoder* aDecoder, double aCurrentTime) {
michael@0:         TimedMetadata* metadata = mMetadataQueue.getFirst();
michael@0:         while (metadata && aCurrentTime >= static_cast<double>(metadata->mPublishTime) / USECS_PER_S) {
michael@0:           nsCOMPtr<nsIRunnable> metadataUpdatedEvent =
michael@0:             new AudioMetadataEventRunner(aDecoder,
michael@0:                                          metadata->mChannels,
michael@0:                                          metadata->mRate,
michael@0:                                          metadata->mHasAudio,
michael@0:                                          metadata->mHasVideo,
michael@0:                                          metadata->mTags.forget());
michael@0:           NS_DispatchToMainThread(metadataUpdatedEvent, NS_DISPATCH_NORMAL);
michael@0:           delete mMetadataQueue.popFirst();
michael@0:           metadata = mMetadataQueue.getFirst();
michael@0:         }
michael@0:       }
michael@0:     protected:
michael@0:       LinkedList<TimedMetadata> mMetadataQueue;
michael@0:   };
michael@0: }
michael@0: 
michael@0: #endif