/*

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 * for unrestricted use.  Users may copy or modify this source code without

 * charge.

 *

 * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING

 * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun source code is provided with no support and without any obligation on

 * the part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

/*

 * g72x.h

 *

 * Header file for CCITT conversion routines.

 *

 */

#ifndef _G72X_H

#define        _G72X_H

#define        AUDIO_ENCODING_ULAW        (1)        /* ISDN u-law */

#define        AUDIO_ENCODING_ALAW        (2)        /* ISDN A-law */

#define        AUDIO_ENCODING_LINEAR        (3)        /* PCM 2's-complement (0-center) */

/*

 * The following is the definition of the state structure

 * used by the G.721/G.723 encoder and decoder to preserve their internal

 * state between successive calls.  The meanings of the majority

 * of the state structure fields are explained in detail in the

 * CCITT Recommendation G.721.  The field names are essentially indentical

 * to variable names in the bit level description of the coding algorithm

 * included in this Recommendation.

 */

struct g72x_state {

        long yl;        /* Locked or steady state step size multiplier. */

        short yu;        /* Unlocked or non-steady state step size multiplier. */

        short dms;        /* Short term energy estimate. */

        short dml;        /* Long term energy estimate. */

        short ap;        /* Linear weighting coefficient of 'yl' and 'yu'. */

        short a[2];        /* Coefficients of pole portion of prediction filter. */

        short b[6];        /* Coefficients of zero portion of prediction filter. */

        short pk[2];        /*

                         * Signs of previous two samples of a partially

                         * reconstructed signal.

                         */

        short dq[6];        /*

                         * Previous 6 samples of the quantized difference

                         * signal represented in an internal floating point

                         * format.

                         */

        short sr[2];        /*

                         * Previous 2 samples of the quantized difference

                         * signal represented in an internal floating point

                         * format.

                         */

        char td;        /* delayed tone detect, new in 1988 version */

};

/* External function definitions. */

extern void g72x_init_state(struct g72x_state *);

extern int g721_encoder(

                int sample,

                int in_coding,

                struct g72x_state *state_ptr);

extern int g721_decoder(

                int code,

                int out_coding,

                struct g72x_state *state_ptr);

extern int g723_24_encoder(

                int sample,

                int in_coding,

                struct g72x_state *state_ptr);

extern int g723_24_decoder(

                int code,

                int out_coding,

                struct g72x_state *state_ptr);

extern int g723_40_encoder(

                int sample,

                int in_coding,

                struct g72x_state *state_ptr);

extern int g723_40_decoder(

                int code,

                int out_coding,

                struct g72x_state *state_ptr);

extern int

quantize(

         int                d,        

         int                y,        

        short                *table,        

        int                size);

extern int reconstruct(int,int,int);void

extern update(

        int                code_size,        

        int                y,                

        int                wi,                

        int                fi,                

        int                dq,                

        int                sr,                

        int                dqsez,                

        struct g72x_state *state_ptr);

extern int

tandem_adjust_alaw(

        int                sr,        

        int                se,        

        int                y,        

        int                i,        

        int                sign,

        short                *qtab);

extern int

tandem_adjust_ulaw(

        int                sr,        

        int                se,        

        int                y,        

        int                i,        

        int                sign,

        short                *qtab);

extern unsigned char

linear2alaw(

        int                pcm_val);

extern int

alaw2linear(

        unsigned char        a_val);

extern unsigned char

linear2ulaw(int                pcm_val);

extern int ulaw2linear(        unsigned char        u_val);

extern int predictor_zero(struct g72x_state *state_ptr);

extern int predictor_pole(        struct g72x_state *state_ptr);

extern int step_size(        struct g72x_state *state_ptr);

#endif /* !_G72X_H */