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#ifndef _SNDRENDER_H_INCLUDED
#define _SNDRENDER_H_INCLUDED

/*
   sound resampling core for Unreal Speccy project
   created under public domain license by SMT, jan.2006
*/




#include "sndbuffer.h"
#include "../sysdefs.h"

//=============================================================================
#ifdef SND_EXTERNAL_BUFFER
    #if ((SND_EXTERNAL_BUFFER_SIZE & (SND_EXTERNAL_BUFFER_SIZE-1)) != 0)
        #pragma error("SND_EXTERNAL_BUFFER_SIZE must be power of 2")
    #endif
#endif
//=============================================================================

union SNDSAMPLE;
struct SNDOUT;

const unsigned SNDR_DEFAULT_SYSTICK_RATE = 3500000; // ZX-Spectrum Z80 clock
const unsigned SNDR_DEFAULT_SAMPLE_RATE = 44100;
const unsigned TICK_FF = 6;            // oversampling ratio: 2^6 = 64
const unsigned MULT_C = 12;   // fixed point precision for 'system tick -> sound tick'

#ifdef SND_EXTERNAL_BUFFER
 typedef unsigned bufptr_t;
#else
 typedef SNDSAMPLE *bufptr_t;
#endif

//=============================================================================
class SNDRENDER
{
    friend class SNDCOUNTER;
   
//-----------------------------------------------------------------------------
public:

    //-------------------------------------------------------------------------
    void set_timings(   unsigned clock_rate,
                        unsigned sample_rate
                );
    //-------------------------------------------------------------------------
    // 'render' is a function that converts array of DAC inputs into PCM-buffer
    unsigned render(    SNDOUT *src,
                        unsigned srclen,
                        unsigned clk_ticks,
                        bufptr_t dst
                );
    //-------------------------------------------------------------------------
    // set of functions that fills buffer in emulation progress
    void start_frame( bufptr_t dst);
    //-------------------------------------------------------------------------
    void update(     unsigned timestamp,
                     unsigned l,
                     unsigned r
                );
    //-------------------------------------------------------------------------
    unsigned end_frame( unsigned clk_ticks);
    //-------------------------------------------------------------------------
    unsigned end_empty_frame( unsigned clk_ticks);
    //-------------------------------------------------------------------------
    // new start position as previous end position
    // (continue to fill buffer)
    void start_frame()
    {
        start_frame( dstpos);
    }
    //-------------------------------------------------------------------------
    SNDRENDER();
   
//-----------------------------------------------------------------------------
protected:

    unsigned mix_l;
    unsigned mix_r;
   
    bufptr_t dstpos;
    bufptr_t dst_start;
   
    unsigned clock_rate;  // Âõîäíàÿ ÷àñòîòà (íà ýòîé ÷àñòîòå êëèåíò äåëàåò çàïèñü â SNDRENDER)
    unsigned sample_rate; // Âûõîäíàÿ ÷àñòîòà (íà ýòîé ÷àñòîòå ôîðìèðóåòñÿ âûõîäíîé pcm)

//-----------------------------------------------------------------------------
private:

    unsigned base_tick; // Òåêóùèé òàêò ñ ìîìåíòà èíèöèàëèçàöèè íà ÷àñòîòå îâåðñýìïëèíãà
    unsigned tick;      // Òàêò îò íà÷àëà êàäðà íà ÷àñòîòå îâåðñýìïëèíãà
    unsigned s1_l;
    unsigned s1_r;
    unsigned s2_l;
    unsigned s2_r;
   
    unsigned firstsmp;  // Alone Coder
   
    int oldleft;        // Alone Coder
    int useleft;
    int olduseleft;
    int oldfrmleft;    
   
    int oldright;       // Alone Coder
    int useright;      
    int olduseright;
    int oldfrmright;

    uint64_t passed_clk_ticks;  // ×èñëî òàêòîâ âõîäíîé ÷àñòîòû ïðîøåäøåå ñ ìîìåíòà èíèöèàëèçàöèè
    uint64_t passed_snd_ticks;  // ×èñëî âûõîäíûõ ñýìïëîâ íà ÷àñòîòå îâåðñýìïëèíãà ïðîøåäøåå ñ ìîìåíòà èíèöèàëèçàöèè
//   unsigned mult_const;

    void flush( unsigned endtick);
};
//=============================================================================


//=============================================================================
union SNDSAMPLE
{
   unsigned sample; // left/right channels in low/high WORDs
   struct { unsigned short left, right; } ch; // or left/right separately
};

struct SNDOUT
{
   unsigned timestamp; // in 'system clock' ticks
   SNDSAMPLE newvalue;
};



#endif // _SNDRENDER_H_INCLUDED