ivideotarget.h

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#pragma once

#include "videoframe.h"
#include "except.h"
#include "iobserver.h"
#include "macros.h"

namespace gg
{

class IVideoTarget : public IObserver
{
protected:
    IVideoTarget()
    {
        // nop
    }

public:
    virtual ~IVideoTarget()
    {
        // nop
    }

public:
    virtual void append(const VideoFrame & frame) = 0;

    void update(VideoFrame & frame) override
    {
        append(frame);
    }

protected:
    virtual void init(const std::string filepath, const float framerate) = 0;

    virtual void finalise() = 0;

protected:
    virtual void check_filetype_support(
            const std::string filepath,
            const std::string filetype)
    {
        if (filepath.empty())
            throw VideoTargetError("Empty filepath specified");
        else if (filepath.length() <= filetype.length()+1) // +1 for the dot, i.e. .mp4
            throw VideoTargetError("Filepath not long enough to deduce output format");
        else if (0 != filepath.compare(
                            filepath.length() - filetype.length(),
                            filetype.length(),
                            filetype))
        {
            std::string msg;
            msg.append("Filetype of ")
               .append(filepath)
               .append(" not supported, use *.")
               .append(filetype)
               .append(" instead");
            throw VideoTargetError(msg);
        }
        else
            return; // nop, i.e. pass
    }

protected:
    DISALLOW_COPY_AND_ASSIGNMENT(IVideoTarget);
};

}