127 lines
2.5 KiB
C
127 lines
2.5 KiB
C
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// Copyright 1998-2018 Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreTypes.h"
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#include "IMediaOverlaySample.h"
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#include "Internationalization/Regex.h"
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#include "MediaSampleQueue.h"
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#include "Misc/Timespan.h"
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/**
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* Implements an overlay text sample for WmfMedia.
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*/
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class FFFMPEGMediaOverlaySample
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: public IMediaOverlaySample
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{
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public:
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/** Default constructor. */
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FFFMPEGMediaOverlaySample()
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: Duration(FTimespan::Zero())
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, Time(FTimespan::Zero())
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{ }
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/** Virtual destructor. */
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virtual ~FFFMPEGMediaOverlaySample() { }
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public:
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/**
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* Initialize the sample.
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*
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* @param InBuffer The sample's data buffer.
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* @param InTime The sample time (relative to presentation clock).
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* @param InDuration The duration for which the sample is valid.
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*/
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bool Initialize(
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const char* InBuffer,
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FVector2D InPosition,
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FTimespan InTime,
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FTimespan InDuration)
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{
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if (InBuffer == nullptr)
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{
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return false;
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}
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// simply strip all formatting for now
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FString StrippedText;
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{
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static const FRegexPattern StripHtmlPattern(TEXT("<(?:[^>=]|='[^']*'|=\"[^\"]*\"|=[^'\"][^\\s>]*)*>"));
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const FString InputText = ANSI_TO_TCHAR(InBuffer);
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FRegexMatcher Matcher(StripHtmlPattern, InputText);
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int32 TextBegin = INDEX_NONE;
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while (Matcher.FindNext())
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{
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if (TextBegin != INDEX_NONE)
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{
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StrippedText += InputText.Mid(TextBegin, Matcher.GetMatchBeginning() - TextBegin);
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}
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TextBegin = Matcher.GetMatchEnding();
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}
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if (TextBegin > INDEX_NONE)
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{
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StrippedText += InputText.Mid(TextBegin);
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}
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}
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Duration = (InDuration < FTimespan::Zero()) ? FTimespan::MaxValue() : InDuration;
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Text = FText::FromString(StrippedText);
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Time = InTime;
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Position = InPosition;
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return true;
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}
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public:
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//~ IMediaOverlaySample interface
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virtual FTimespan GetDuration() const override
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{
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return Duration;
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}
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virtual TOptional<FVector2D> GetPosition() const override
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{
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return TOptional<FVector2D>();
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}
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virtual FText GetText() const override
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{
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return Text;
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}
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virtual FMediaTimeStamp GetTime() const override
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{
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return Time;
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}
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virtual EMediaOverlaySampleType GetType() const override
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{
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return EMediaOverlaySampleType::Subtitle;
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}
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private:
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/** The duration for which the sample is valid. */
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FTimespan Duration;
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/** The overlay text. */
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FText Text;
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/** Presentation time for which the sample was generated. */
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FMediaTimeStamp Time;
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/** Position for the subtitle */
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FVector2D Position;
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};
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