|| || || || || || || ||

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VideoAccessStrategyFactory.h

Go to the documentation of this file.

#ifndef Impala_Core_Stream_Lavc_VideoAccessStrategyFactory_h
#define Impala_Core_Stream_Lavc_VideoAccessStrategyFactory_h

#include "Basis/CmdOptions.h"

#include "Core/Stream/Lavc/VideoAccessObject.h"
#include "Core/Stream/Lavc/VideoAccessStrategy.h"
#include "Core/Stream/Lavc/StrategyUsingNativeIndex.h"
#include "Core/Stream/Lavc/StrategyIgnoringNativeIndex.h"

namespace Impala
{
namespace Core
{
namespace Stream
{
namespace Lavc
{

class VideoAccessStrategyFactory
{

public:

    VideoAccessStrategy*
    Construct(CString videoAddress) const
    {
        const Lavc::VideoAccessObject* vao = 
            new Lavc::VideoAccessObject(videoAddress);
        if (vao == 0 || !vao->IsValid())
            return 0;

        // consider the user's preference and otherwise the default value:
        bool useNativeIndex = 
            (CmdOptions::GetInstance().GetString("jmp") == "pts");

        const String formatName = vao->FormatNameShort();
        if ((formatName == "avi") ||
            (formatName == "mov,mp4,m4a,3gp,3g2,mj2"))
        {
            const String codecName = vao->VideoCodecName();

            // "mpeg1video" is troublesome with presentation timestamps,
            if (codecName != "mpeg1video")
                useNativeIndex = vao->NativeIndexValid();
        }

        // ownership of the VAO will be passed to the strategy object 
        if (useNativeIndex)
            return new StrategyUsingNativeIndex(vao);
        else
            return new StrategyIgnoringNativeIndex(vao);
    }


private:

    ILOG_VAR_DECL;

}; //class

ILOG_VAR_INIT(VideoAccessStrategyFactory, Impala.Core.Stream.Lavc);

}}}} // namespace Impala::Core::Stream::Lavc

#endif

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