FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/preemph.h @ 492:cc3a831712a4
libgsmhr1: implement arbitrary RTP input
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 15 Jun 2024 06:52:37 +0000 |
parents | 3618b5cf25a6 |
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rev | line source |
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libtwamr: integrate preemph.c
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1 /* |
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2 ******************************************************************************** |
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3 * |
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 |
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5 * R99 Version 3.3.0 |
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6 * REL-4 Version 4.1.0 |
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7 * |
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8 ******************************************************************************** |
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9 * |
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10 * File : preemph.h |
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11 * Purpose : Preemphasis filtering |
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12 * Description : Filtering through 1 - g z^-1 |
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13 * |
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14 ******************************************************************************** |
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15 */ |
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16 #ifndef preemph_h |
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17 #define preemph_h "$Id $" |
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18 |
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19 /* |
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20 ******************************************************************************** |
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21 * INCLUDE FILES |
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22 ******************************************************************************** |
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23 */ |
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24 #include "typedef.h" |
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25 |
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26 /* |
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27 ******************************************************************************** |
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28 * DEFINITION OF DATA TYPES |
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29 ******************************************************************************** |
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30 */ |
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31 typedef struct { |
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32 Word16 mem_pre; /* filter state */ |
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33 } preemphasisState; |
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34 |
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35 /* |
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36 ******************************************************************************** |
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37 * DECLARATION OF PROTOTYPES |
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38 ******************************************************************************** |
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39 */ |
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40 |
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41 void preemphasis_reset (preemphasisState *st); |
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42 /* reset of preemphasis filter (i.e. set state memory to zero) |
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43 returns 0 on success |
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44 */ |
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45 |
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46 int preemphasis ( |
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47 preemphasisState *st, /* (i/o): preemphasis filter state */ |
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48 Word16 *signal, /* (i/o): input signal overwritten by the output */ |
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49 Word16 g, /* (i) : preemphasis coefficient */ |
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50 Word16 L /* (i) : size of filtering */ |
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51 ); |
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52 |
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53 #endif |