FreeCalypso > hg > gsm-codec-lib

annotate libgsmhr1/typedefs.h @ 553:ebcf414b7d99

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doc/TFO-transform: describe details for FRv1, both modes
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 07 Oct 2024 08:24:24 +0000
parents 446a4a2955ba
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 #include <stdint.h>
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12 #define LW_SIGN (long)0x80000000 /* sign bit */
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13 #define LW_MIN (long)0x80000000
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14 #define LW_MAX (long)0x7fffffff
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16 #define SW_SIGN (short)0x8000 /* sign bit for Shortword type */
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17 #define SW_MIN (short)0x8000 /* smallest Ram */
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18 #define SW_MAX (short)0x7fff /* largest Ram */
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19
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20 /* Definition of Types *
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21 ***********************/
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22
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23 typedef int32_t Longword; /* 32 bit "accumulator" (L_*) */
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24 typedef int16_t Shortword; /* 16 bit "register" (sw*) */
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25 typedef int16_t ShortwordRom; /* 16 bit ROM data (sr*) */
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26 typedef int32_t LongwordRom; /* 32 bit ROM data (L_r*) */
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28 struct NormSw
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29 { /* normalized Shortword fractional
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30 * number snr.man precedes snr.sh (the
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31 * shift count)i */
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32 Shortword man; /* "mantissa" stored in 16 bit
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33 * location */
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34 Shortword sh; /* the shift count, stored in 16 bit
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35 * location */
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36 };
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37
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38 /* Global constants *
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39 ********************/
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40
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41 #define NP 10 /* order of the lpc filter */
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42 #define N_SUB 4 /* number of subframes */
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43 #define F_LEN 160 /* number of samples in a frame */
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44 #define S_LEN 40 /* number of samples in a subframe */
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45 #define A_LEN 170 /* LPC analysis length */
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46 #define OS_FCTR 6 /* maximum LTP lag oversampling
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47 * factor */
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48
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49 #define OVERHANG 8 /* vad parameter */
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51 #endif