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annotate libtwamr/pstfilt.h @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 59655481e45b
children
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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