From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- dom/media/MediaDataDemuxer.h | 214 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 214 insertions(+) create mode 100644 dom/media/MediaDataDemuxer.h (limited to 'dom/media/MediaDataDemuxer.h') diff --git a/dom/media/MediaDataDemuxer.h b/dom/media/MediaDataDemuxer.h new file mode 100644 index 000000000..cf2b265d5 --- /dev/null +++ b/dom/media/MediaDataDemuxer.h @@ -0,0 +1,214 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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(MediaDataDemuxer_h) +#define MediaDataDemuxer_h + +#include "mozilla/MozPromise.h" +#include "mozilla/UniquePtr.h" + +#include "MediaData.h" +#include "MediaInfo.h" +#include "MediaResult.h" +#include "TimeUnits.h" +#include "nsISupportsImpl.h" +#include "mozilla/RefPtr.h" +#include "nsTArray.h" + +namespace mozilla { + +class MediaTrackDemuxer; +class TrackMetadataHolder; + +// Allows reading the media data: to retrieve the metadata and demux samples. +// MediaDataDemuxer isn't designed to be thread safe. +// When used by the MediaFormatDecoder, care is taken to ensure that the demuxer +// will never be called from more than one thread at once. +class MediaDataDemuxer +{ +public: + NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaDataDemuxer) + + typedef MozPromise InitPromise; + + // Initializes the demuxer. Other methods cannot be called unless + // initialization has completed and succeeded. + // Typically a demuxer will wait to parse the metadata before resolving the + // promise. The promise must not be resolved until sufficient data is + // supplied. For example, an incomplete metadata would cause the promise to be + // rejected should no more data be coming, while the demuxer would wait + // otherwise. + virtual RefPtr Init() = 0; + + // Returns true if a aType track type is available. + virtual bool HasTrackType(TrackInfo::TrackType aType) const = 0; + + // Returns the number of tracks of aType type available. A value of + // 0 indicates that no such type is available. + virtual uint32_t GetNumberTracks(TrackInfo::TrackType aType) const = 0; + + // Returns the MediaTrackDemuxer associated with aTrackNumber aType track. + // aTrackNumber is not to be confused with the Track ID. + // aTrackNumber must be constrained between 0 and GetNumberTracks(aType) - 1 + // The actual Track ID is to be retrieved by calling + // MediaTrackDemuxer::TrackInfo. + virtual already_AddRefed GetTrackDemuxer(TrackInfo::TrackType aType, + uint32_t aTrackNumber) = 0; + + // Returns true if the underlying resource allows seeking. + virtual bool IsSeekable() const = 0; + + // Returns true if the underlying resource can only seek within buffered + // ranges. + virtual bool IsSeekableOnlyInBufferedRanges() const { return false; } + + // Returns the media's crypto information, or nullptr if media isn't + // encrypted. + virtual UniquePtr GetCrypto() + { + return nullptr; + } + + // Notifies the demuxer that the underlying resource has received more data + // since the demuxer was initialized. + // The demuxer can use this mechanism to inform all track demuxers that new + // data is available and to refresh its buffered range. + virtual void NotifyDataArrived() { } + + // Notifies the demuxer that the underlying resource has had data removed + // since the demuxer was initialized. + // The demuxer can use this mechanism to inform all track demuxers to update + // its buffered range. + // This will be called should the demuxer be used with MediaSourceResource. + virtual void NotifyDataRemoved() { } + + // Indicate to MediaFormatReader if it should compute the start time + // of the demuxed data. If true (default) the first sample returned will be + // used as reference time base. + virtual bool ShouldComputeStartTime() const { return true; } + +protected: + virtual ~MediaDataDemuxer() + { + } +}; + +class MediaTrackDemuxer +{ +public: + NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaTrackDemuxer) + + class SamplesHolder { + public: + NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SamplesHolder) + nsTArray> mSamples; + private: + ~SamplesHolder() {} + }; + + class SkipFailureHolder { + public: + SkipFailureHolder(const MediaResult& aFailure, uint32_t aSkipped) + : mFailure(aFailure) + , mSkipped(aSkipped) + {} + MediaResult mFailure; + uint32_t mSkipped; + }; + + typedef MozPromise SeekPromise; + typedef MozPromise, MediaResult, /* IsExclusive = */ true> SamplesPromise; + typedef MozPromise SkipAccessPointPromise; + + // Returns the TrackInfo (a.k.a Track Description) for this track. + // The TrackInfo returned will be: + // TrackInfo::kVideoTrack -> VideoInfo. + // TrackInfo::kAudioTrack -> AudioInfo. + // respectively. + virtual UniquePtr GetInfo() const = 0; + + // Seeks to aTime. Upon success, SeekPromise will be resolved with the + // actual time seeked to. Typically the random access point time + virtual RefPtr Seek(media::TimeUnit aTime) = 0; + + // Returns the next aNumSamples sample(s) available. + // If only a lesser amount of samples is available, only those will be + // returned. + // A aNumSamples value of -1 indicates to return all remaining samples. + // A video sample is typically made of a single video frame while an audio + // sample will contains multiple audio frames. + virtual RefPtr GetSamples(int32_t aNumSamples = 1) = 0; + + // Returns true if a call to GetSamples() may block while waiting on the + // underlying resource to return the data. + // This is used by the MediaFormatReader to determine if buffering heuristics + // should be used. + virtual bool GetSamplesMayBlock() const + { + return true; + } + + // Cancel all pending actions (Seek, GetSamples) and reset current state + // All pending promises are to be rejected with CANCEL. + // The next call to GetSamples would return the first sample available in the + // track. + virtual void Reset() = 0; + + // Returns timestamp of next random access point or an error if the demuxer + // can't report this. + virtual nsresult GetNextRandomAccessPoint(media::TimeUnit* aTime) + { + return NS_ERROR_NOT_IMPLEMENTED; + } + + // Returns timestamp of previous random access point or an error if the + // demuxer can't report this. + virtual nsresult GetPreviousRandomAccessPoint(media::TimeUnit* aTime) + { + return NS_ERROR_NOT_IMPLEMENTED; + } + + // Skip frames until the next Random Access Point located after + // aTimeThreshold. + // The first frame returned by the next call to GetSamples() will be the + // first random access point found after aTimeThreshold. + // Upon success, returns the number of frames skipped. + virtual RefPtr SkipToNextRandomAccessPoint(media::TimeUnit aTimeThreshold) = 0; + + // Gets the resource's offset used for the last Seek() or GetSample(). + // A negative value indicates that this functionality isn't supported. + virtual int64_t GetResourceOffset() const + { + return -1; + } + + virtual TrackInfo::TrackType GetType() const + { + return GetInfo()->GetType(); + } + + virtual media::TimeIntervals GetBuffered() = 0; + + // By default, it is assumed that the entire resource can be evicted once + // all samples have been demuxed. + virtual int64_t GetEvictionOffset(const media::TimeUnit& aTime) + { + return INT64_MAX; + } + + // If the MediaTrackDemuxer and MediaDataDemuxer hold cross references. + // BreakCycles must be overridden. + virtual void BreakCycles() + { + } + +protected: + virtual ~MediaTrackDemuxer() {} +}; + +} // namespace mozilla + +#endif // MediaDataDemuxer_h -- cgit v1.2.3