#define CASCADE_PARALLEL 1         /* Type of synthesis model */
#define ALL_PARALLEL     2 

#define IMPULSIVE        1         /* Type of voicing source */
#define NATURAL          2
#define SAMPLED          3

#define PI               3.1415927


/* typedef's that need to be exported */

typedef long flag;

/* Resonator Structure */

typedef struct
{
	double a;
	double b;
	double c;
	double p1;
	double p2;
	double a_inc;
	double b_inc;
	double c_inc;
} resonator_t, *resonator_ptr;

/* Structure for Klatt Globals */

typedef struct
{
  flag synthesis_model; /* cascade-parallel or all-parallel */
  flag outsl;       /* Output waveform selector                      */
  long samrate;     /* Number of output samples per second           */
  long FLPhz ;      /* Frequeny of glottal downsample low-pass filter */
  long BLPhz ;      /* Bandwidth of glottal downsample low-pass filter */
  flag glsource;    /* Type of glottal source */
  int f0_flutter;   /* Percentage of f0 flutter 0-100 */
  long nspfr;       /* number of samples per frame */
  long nper;        /* Counter for number of samples in a pitch period */
  long ns;
  long T0;          /* Fundamental period in output samples times 4 */
  long nopen;       /* Number of samples in open phase of period    */
  long nmod;        /* Position in period to begin noise amp. modul */
  long nrand;       /* Varible used by random number generator      */
  double pulse_shape_a;  /* Makes waveshape of glottal pulse when open   */
  double pulse_shape_b;  /* Makes waveshape of glottal pulse when open   */
  double minus_pi_t;
  double two_pi_t;
  double onemd;
  double decay;
  double amp_bypas; /* AB converted to linear gain              */
  double amp_voice; /* AVdb converted to linear gain            */
  double par_amp_voice; /* AVpdb converted to linear gain       */
  double amp_aspir; /* AP converted to linear gain              */
  double amp_frica; /* AF converted to linear gain              */
  double amp_breth; /* ATURB converted to linear gain           */
  double amp_gain0; /* G0 converted to linear gain              */
  int num_samples; /* number of glottal samples */
  double sample_factor; /* multiplication factor for glottal samples */
  short *natural_samples; /* pointer to an array of glottal samples */
  long original_f0; /* original value of f0 not modified by flutter */

	int fadeout;       // set to 64 to cause fadeout over 64 samples
	int scale_wav;     // depends on the voicing source

#define N_RSN 20
#define Rnz  0   // nasal zero, anti-resonator
#define R1c  1
#define R2c  2
#define R3c  3
#define R4c  4
#define R5c  5
#define R6c  6
#define R7c  7
#define R8c  8
#define Rnpc 9   // nasal pole

#define Rparallel 10
#define Rnpp 10
#define R1p  11
#define R2p  12
#define R3p  13
#define R4p  14
#define R5p  15
#define R6p  16

#define RGL  17
#define RLP  18
#define Rout 19

  resonator_t rsn[N_RSN];	 // internal storage for resonators
  resonator_t rsn_next[N_RSN];

} klatt_global_t, *klatt_global_ptr;
  
/* Structure for Klatt Parameters */

#define F_NZ   0  // nasal zero formant
#define F1     1
#define F2     2
#define F3     3
#define F4     4
#define F5     5
#define F6     6
#define F_NP   9  // nasal pole formant


typedef struct
{
	int F0hz10; /* Voicing fund freq in Hz                          */
	int AVdb;   /* Amp of voicing in dB,            0 to   70       */
	int Fhz[10];  // formant Hz, F_NZ to F6 to F_NP
	int Bhz[10];
	int Ap[10];   /* Amp of parallel formants in dB,    0 to   80       */
	int Bphz[10]; /* Parallel formants bw in Hz,       40 to 1000      */

	int ASP;    /* Amp of aspiration in dB,         0 to   70       */
	int Kopen;  /* # of samples in open period,     10 to   65      */
	int Aturb;  /* Breathiness in voicing,          0 to   80       */
	int TLTdb;  /* Voicing spectral tilt in dB,     0 to   24       */
	int AF;     /* Amp of frication in dB,          0 to   80       */
	int Kskew;  /* Skewness of alternate periods,   0 to   40 in sample#/2  */

	int AB;     /* Amp of bypass fric. in dB,       0 to   80       */
	int AVpdb;  /* Amp of voicing,  par in dB,      0 to   70       */
	int Gain0;  /* Overall gain, 60 dB is unity,    0 to   60       */

	int AVdb_tmp;      //copy of AVdb, which is changed within parwave()
	int Fhz_next[10];    // Fhz for the next chunk, so we can do interpolation of resonator (a,b,c) parameters
	int Bhz_next[10];
 } klatt_frame_t, *klatt_frame_ptr;


typedef struct {
	int freq;     // Hz
	int bw;   // klatt bandwidth
	int ap;   // parallel amplitude
	int bp;   // parallel bandwidth
	DOUBLEX freq1; // floating point versions of the above
	DOUBLEX bw1;
	DOUBLEX ap1;
	DOUBLEX bp1;
	DOUBLEX freq_inc;    // increment by this every 64 samples
	DOUBLEX bw_inc;
	DOUBLEX ap_inc;
	DOUBLEX bp_inc;
}  klatt_peaks_t;