FreeCalypso > hg > gsmhr-codec-ref

annotate typedefs.h @ 4:a2529fec5442

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Jul 2024 22:40:24 +0000
parents 9008dbc8ca74
children
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1 /*******************************************************************
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2 *
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3 * typedef statements of types used in all half-rate GSM routines
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4 *
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5 ******************************************************************/
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6
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7 #ifndef __TYPEDEFS
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8 #define __TYPEDEFS
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9
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10 #define DATE "August 8, 1996 "
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11 #define VERSION "Version 4.2 "
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12
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13 #define LW_SIGN (long)0x80000000 /* sign bit */
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14 #define LW_MIN (long)0x80000000
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15 #define LW_MAX (long)0x7fffffff
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16
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17 #define SW_SIGN (short)0x8000 /* sign bit for Shortword type */
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18 #define SW_MIN (short)0x8000 /* smallest Ram */
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19 #define SW_MAX (short)0x7fff /* largest Ram */
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20
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21 /* Definition of Types *
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22 ***********************/
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23
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24 typedef long int Longword; /* 32 bit "accumulator" (L_*) */
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25 typedef short int Shortword; /* 16 bit "register" (sw*) */
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26 typedef short int ShortwordRom; /* 16 bit ROM data (sr*) */
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27 typedef long int LongwordRom; /* 32 bit ROM data (L_r*) */
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28
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29 struct NormSw
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30 { /* normalized Shortword fractional
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31 * number snr.man precedes snr.sh (the
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32 * shift count)i */
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33 Shortword man; /* "mantissa" stored in 16 bit
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34 * location */
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35 Shortword sh; /* the shift count, stored in 16 bit
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36 * location */
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37 };
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38
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39 /* Global constants *
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40 ********************/
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41
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42 #define NP 10 /* order of the lpc filter */
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43 #define N_SUB 4 /* number of subframes */
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44 #define F_LEN 160 /* number of samples in a frame */
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45 #define S_LEN 40 /* number of samples in a subframe */
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46 #define A_LEN 170 /* LPC analysis length */
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47 #define OS_FCTR 6 /* maximum LTP lag oversampling
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48 * factor */
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49
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50 #define OVERHANG 8 /* vad parameter */
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51 #define strStr strStr16
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52
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53 /* global variables */
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54 /********************/
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55
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56 extern int giFrmCnt; /* 0,1,2,3,4..... */
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57 extern int giSfrmCnt; /* 0,1,2,3 */
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59 extern int giDTXon; /* DTX Mode on/off */
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60
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61 #endif