/*************************************************************************/
/*                                                                       */
/*                  Language Technologies Institute                      */
/*                     Carnegie Mellon University                        */
/*                        Copyright (c) 2001                             */
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/*                                                                       */
/*************************************************************************/
/*             Author:  Alan W Black (awb@cs.cmu.edu)                    */
/*               Date:  January 2001                                     */
/*************************************************************************/
/*                                                                       */
/*  Short term signals                                                   */
/*                                                                       */
/*************************************************************************/
#ifndef _CST_STS_H__
#define _CST_STS_H__

#include <stdio.h>

/* The short term singal (sts) structure is the basic unit data info  */
/* it may be diphones of general units, indexes and names are held    */
/* else where, this information plus the indexes in the Unit relation */
/* allow reconstruction of the signal itself                          */
struct cst_sts_struct {
    const unsigned short *frame;  
    const int size;      /* in samples */
    const unsigned char *residual;
};
typedef struct cst_sts_struct cst_sts;

struct cst_sts_list_struct {
    const cst_sts *sts;

    /* These "extra" pointers allow the cst_sts array members to point
       into a memory-mapped file instead of having all the data linked
       in.  In the case where the size of short-term signals is fixed
       then the cst_sts array may in fact be NULL and we will just
       index directly off of these. */
    const unsigned short *frames;
    const unsigned char *residuals;
    const unsigned long *resoffs;

    int num_sts;          /* But I don't think you need that number */
    int num_channels;     /* typically lpc order */
    int sample_rate;
    float coeff_min;      /* used for decoding the short representation */
    float coeff_range;    /* for coefficients  */ 
    float post_emphasis;  /* not sure about this */
    int residual_fold;    /* residual has been "folded" by this factor */
};
typedef struct cst_sts_list_struct cst_sts_list;

/* This is used to represent a newly constructed waveform to be synthed */
struct cst_lpcres_struct {
    const unsigned short **frames;
    int *times;
    int num_frames;
    int num_channels;
    float lpc_min;
    float lpc_range;
    float post_emphasis;
    int num_samples;
    int sample_rate;
    int residual_fold;
    int *sizes;
    unsigned char *residual;
};
typedef struct cst_lpcres_struct cst_lpcres;

cst_lpcres *new_lpcres();
void delete_lpcres(cst_lpcres *l);
float lpcres_frame_shift(cst_lpcres *t, int frame);
void lpcres_resize_frames(cst_lpcres *l,int num_frames);
void lpcres_resize_samples(cst_lpcres *l,int num_samples);

cst_sts_list *new_sts_list();
void delete_sts_list(cst_sts_list *l);

const unsigned short * get_sts_frame(const cst_sts_list *sts_list, int frame);
const unsigned char * get_sts_residual(const cst_sts_list *sts_list, int frame);

int get_frame_size(const cst_sts_list *sts_list, int frame);
int get_unit_size(const cst_sts_list *s,int start, int end);

CST_VAL_USER_TYPE_DCLS(lpcres,cst_lpcres)
CST_VAL_USER_TYPE_DCLS(sts_list,cst_sts_list)

#endif
