#ifndef PCM_INTERFACE_H
#define PCM_INTERFACE_H
#include <QString>
#include <QVariant>

struct Xen_PCM_TransferInfo
{
    double *buffer; // 64 bit floating point all the way!
    quint64 nframes; // allow to transfer huge buffers
    int numOutChannels; // sources should always find a way to satisfy this in some way
    double outSampleRate; // floating point for pitch bends or whatever
};

class IXen_PCM_Source
{
public:
    enum SeekMode
    {
        SeekFromStart=0,
        SeekFromEnd,
        SeekFromCurrentPos
    };
    virtual ~IXen_PCM_Source() {};
    virtual IXen_PCM_Source* duplicate()=0;
    virtual bool saveState(QVariantMap &map)=0;
    virtual bool loadState(QVariantMap &map)=0;
    virtual bool isAvailable()=0; // source could be a valid object but in offline state
    virtual void setAvailable(bool b)=0; // force offline/online state
    virtual int seek(quint64 pos=0,SeekMode mode=SeekFromStart)=0;
    virtual quint64 processAudio(Xen_PCM_TransferInfo* transferInfo)=0; // return number of frames succesfully produced
    // for OSC like messages support, eg. setFile "C:/ass.wav", seek 666
    virtual int sendMessage(const QString &msg)=0;
    // for unanticipated future needs
    virtual int extended(int call,void* par1,void* par2,void* par3) { return 0; }

};

#endif // PCM_INTERFACE_H