FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/pstfilt.h @ 449:2af2b5c12268
Library-versions: libtwamr is officially version 1.0.0
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 01:43:05 +0000 |
parents | 59655481e45b |
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libtwamr: integrate pstfilt.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 : pstfilt.h |
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11 * Purpose : Performs adaptive postfiltering on the synthesis |
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12 * : speech |
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13 * |
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14 ******************************************************************************** |
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15 */ |
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16 #ifndef pstfilt_h |
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17 #define pstfilt_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 "tw_amr.h" |
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25 #include "typedef.h" |
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26 #include "cnst.h" |
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27 #include "preemph.h" |
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28 #include "agc.h" |
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29 /* |
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30 ******************************************************************************** |
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31 * DEFINITION OF DATA TYPES |
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32 ******************************************************************************** |
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33 */ |
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34 typedef struct{ |
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35 Word16 res2[L_SUBFR]; |
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36 Word16 mem_syn_pst[M]; |
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37 preemphasisState preemph_state; |
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38 agcState agc_state; |
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39 Word16 synth_buf[M + L_FRAME]; |
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40 } Post_FilterState; |
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41 |
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42 /* |
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43 ******************************************************************************** |
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44 * DECLARATION OF PROTOTYPES |
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45 ******************************************************************************** |
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46 */ |
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47 |
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48 void Post_Filter_reset (Post_FilterState *st); |
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49 /* reset post filter (i.e. set state memory to zero) |
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50 returns 0 on success |
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51 */ |
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52 |
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53 int Post_Filter ( |
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54 Post_FilterState *st, /* i/o : post filter states */ |
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55 enum Mode mode, /* i : AMR mode */ |
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56 Word16 *syn, /* i/o : synthesis speech (postfiltered is output) */ |
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57 Word16 *Az_4 /* i : interpolated LPC parameters in all subfr. */ |
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58 ); |
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59 /* filters the signal syn using the parameters in Az_4 to calculate filter |
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60 coefficients. |
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61 The filter must be set up using Post_Filter_init prior to the first call |
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62 to Post_Filter. Post_FilterState is updated to mirror the current state |
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63 of the filter |
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64 |
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65 return 0 on success |
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66 */ |
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67 |
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68 #endif |