FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/lpc.h @ 465:026bdc1f0dda
amrefr-tseq-enc: use the new DHF xform that matches T-Mobile
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2024 21:43:35 +0000 |
parents | 9adfe3863a41 |
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libtwamr: integrate lpc.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 : lpc.h |
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11 * Purpose : 2 LP analyses centered at 2nd and 4th subframe |
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12 * for mode 12.2. For all other modes a |
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13 * LP analysis centered at 4th subframe is |
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14 * performed. |
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15 * |
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16 ******************************************************************************** |
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17 */ |
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18 #ifndef lpc_h |
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19 #define lpc_h "$Id $" |
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20 |
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21 /* |
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22 ******************************************************************************** |
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23 * INCLUDE FILES |
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24 ******************************************************************************** |
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25 */ |
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26 #include "tw_amr.h" |
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27 #include "typedef.h" |
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28 #include "levinson.h" |
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29 |
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30 /* |
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31 ******************************************************************************** |
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32 * LOCAL VARIABLES AND TABLES |
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33 ******************************************************************************** |
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34 */ |
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35 /* |
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36 ******************************************************************************** |
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37 * DEFINITION OF DATA TYPES |
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38 ******************************************************************************** |
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39 */ |
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40 typedef struct { |
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41 LevinsonState levinsonSt; |
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42 } lpcState; |
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43 |
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44 /* |
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45 ******************************************************************************** |
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46 * DECLARATION OF PROTOTYPES |
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47 ******************************************************************************** |
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48 */ |
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49 |
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50 void lpc_reset (lpcState *st); |
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51 /* reset of pre processing state (i.e. set state memory to zero) |
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52 returns 0 on success |
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53 */ |
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54 |
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55 int lpc( |
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56 lpcState *st, /* i/o: State struct */ |
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57 enum Mode mode, /* i : coder mode */ |
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58 Word16 x[], /* i : Input signal Q15 */ |
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59 Word16 x_12k2[], /* i : Input signal (EFR) Q15 */ |
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60 Word16 a[] /* o : predictor coefficients Q12 */ |
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61 ); |
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62 |
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63 #endif |