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#rnx #rb none #ROBOMERGE-OWNER: ryan.durand #ROBOMERGE-AUTHOR: ryan.durand #ROBOMERGE-SOURCE: CL 10869210 via CL 10869511 via CL 10869900 #ROBOMERGE-BOT: (v613-10869866) [CL 10870549 by ryan durand in Main branch]
73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "Math/Range.h"
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#include "Math/RangeSet.h"
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#include "Misc/Timespan.h"
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/**
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* Enumerates status types of media samples.
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*
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* @see IMediaSamples.GetSampleState
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*/
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enum class EMediaCacheState
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{
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/** Sample has been cached (reserved for high-level caching; use Loaded in player plug-ins). */
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Cached,
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/** Sample has finished loading. */
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Loaded,
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/** Sample is currently being loaded. */
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Loading,
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/** Sample is scheduled to be loaded. */
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Pending,
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};
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/**
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* Interface for access to a media player's cache.
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*
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* @see IMediaControls, IMediaPlayer, IMediaSamples, IMediaTracks, IMediaView
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*/
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class IMediaCache
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{
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public:
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/**
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* Query the time ranges of cached media samples for the specified caching state.
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*
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* This method can be used to probe a media player's decoder for which samples are
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* scheduled for loading, being loaded, or finished loading. This is generally only
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* supported by those players that expose some kind of internal sample caching or
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* load/decode scheduling mechanism, and most players may simply ignore this call.
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*
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* @param State The sample state we're interested in.
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* @param OutTimeRanges Will contain the set of matching sample time ranges.
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* @return true on success, false if not supported.
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*/
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virtual bool QueryCacheState(EMediaCacheState State, TRangeSet<FTimespan>& OutTimeRanges) const
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{
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return false; // override in child classes, if supported
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}
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/**
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* Query the number of samples for the specified caching state.
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*
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* @param State The sample state we're interested in.
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* @return Sample count.
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*/
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virtual int32 GetSampleCount(EMediaCacheState State) const
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{
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return 0; // override in child classes, if supported
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}
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public:
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/** Virtual destructor. */
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virtual ~IMediaCache() { }
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};
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