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annotate libtwamr/pitch_fr.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 be8edf9e6bc1
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 : pitch_fr.h
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11 * Purpose : Find the pitch period with 1/3 or 1/6 subsample
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12 * : resolution (closed loop).
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef pitch_fr_h
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17 #define pitch_fr_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
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27 /*
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28 ********************************************************************************
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29 * DEFINITION OF DATA TYPES
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30 ********************************************************************************
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31 */
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32 typedef struct {
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33 Word16 T0_prev_subframe; /* integer pitch lag of previous sub-frame */
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34 } Pitch_frState;
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35
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36 /*
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37 ********************************************************************************
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38 * DECLARATION OF PROTOTYPES
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39 ********************************************************************************
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40 */
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41
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42 void Pitch_fr_reset (Pitch_frState *st);
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43 /* reset of pre processing state (i.e. set state memory to zero)
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44 returns 0 on success
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45 */
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46
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47 Word16 Pitch_fr ( /* o : pitch period (integer) */
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48 Pitch_frState *st, /* i/o : State struct */
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49 enum Mode mode, /* i : codec mode */
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50 Word16 T_op[], /* i : open loop pitch lags */
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51 Word16 exc[], /* i : excitation buffer */
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52 Word16 xn[], /* i : target vector */
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53 Word16 h[], /* i : impulse response of synthesis and
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54 weighting filters */
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55 Word16 L_subfr, /* i : Length of subframe */
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56 Word16 i_subfr, /* i : subframe offset */
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57 Word16 *pit_frac, /* o : pitch period (fractional) */
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58 Word16 *resu3, /* o : subsample resolution 1/3 (=1) or 1/6 (=0) */
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59 Word16 *ana_index /* o : index of encoding */
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60 );
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61
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62 #endif