The Tor Browser: content/media/MediaMetadataManager.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #if !defined(MediaMetadataManager_h__)

     8 #define MediaMetadataManager_h__

     9 #include "VideoUtils.h"

    10 #include "mozilla/LinkedList.h"

    11 #include "AbstractMediaDecoder.h"

    12 #include "nsAutoPtr.h"

    14 namespace mozilla {

    16   // A struct that contains the metadata of a media, and the time at which those

    17   // metadata should start to be reported.

    18   class TimedMetadata : public LinkedListElement<TimedMetadata> {

    19     public:

    20       // The time, in microseconds, at which those metadata should be available.

    21       int64_t mPublishTime;

    22       // The metadata. The ownership is transfered to the element when dispatching to

    23       // the main threads.

    24       nsAutoPtr<MetadataTags> mTags;

    25       // The sample rate of this media.

    26       int mRate;

    27       // The number of channel of this media.

    28       int mChannels;

    29       // True if this media has an audio track.

    30       bool mHasAudio;

    31       // True if this media has a video track.

    32       bool mHasVideo;

    33   };

    35   // This class encapsulate the logic to give the metadata from the reader to

    36   // the content, at the right time.

    37   class MediaMetadataManager

    38   {

    39     public:

    40       ~MediaMetadataManager() {

    41         TimedMetadata* element;

    42         while((element = mMetadataQueue.popFirst()) != nullptr) {

    43           delete element;

    44         }

    45       }

    46       void QueueMetadata(TimedMetadata* aMetadata) {

    47         mMetadataQueue.insertBack(aMetadata);

    48       }

    50       void DispatchMetadataIfNeeded(AbstractMediaDecoder* aDecoder, double aCurrentTime) {

    51         TimedMetadata* metadata = mMetadataQueue.getFirst();

    52         while (metadata && aCurrentTime >= static_cast<double>(metadata->mPublishTime) / USECS_PER_S) {

    53           nsCOMPtr<nsIRunnable> metadataUpdatedEvent =

    54             new AudioMetadataEventRunner(aDecoder,

    55                                          metadata->mChannels,

    56                                          metadata->mRate,

    57                                          metadata->mHasAudio,

    58                                          metadata->mHasVideo,

    59                                          metadata->mTags.forget());

    60           NS_DispatchToMainThread(metadataUpdatedEvent, NS_DISPATCH_NORMAL);

    61           delete mMetadataQueue.popFirst();

    62           metadata = mMetadataQueue.getFirst();

    63         }

    64       }

    65     protected:

    66       LinkedList<TimedMetadata> mMetadataQueue;

    67   };

    68 }

    70 #endif

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