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annotate libtwamr/d_plsf.c @ 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 3f574255c3aa
children
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3f574255c3aa libtwamr: integrate d_plsf.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 : d_plsf.c
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11 * Purpose : common part (init, exit, reset) of LSF decoder
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12 * module (rest in d_plsf_3.c and d_plsf_5.c)
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13 *
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14 *****************************************************************************
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15 */
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16
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17
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18 /*
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19 *****************************************************************************
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20 * MODULE INCLUDE FILE AND VERSION ID
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21 *****************************************************************************
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22 */
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23 #include "namespace.h"
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24 #include "d_plsf.h"
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25
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26 /*
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27 *****************************************************************************
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28 * INCLUDE FILES
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29 *****************************************************************************
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30 */
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31 #include "typedef.h"
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32 #include "basic_op.h"
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33 #include "no_count.h"
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34 #include "cnst.h"
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35 #include "memops.h"
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36 #include "q_plsf5_tab.h"
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37
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38 /*
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39 *--------------------------------------------------*
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40 * Constants (defined in cnst.h) *
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41 *--------------------------------------------------*
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42 * M : LPC order
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43 *--------------------------------------------------*
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44 */
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45
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46 /*
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47 *****************************************************************************
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48 * PUBLIC PROGRAM CODE
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49 *****************************************************************************
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50 */
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51
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52 /*
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53 **************************************************************************
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54 *
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55 * Function : D_plsf_reset
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56 * Purpose : Resets state memory
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57 *
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58 **************************************************************************
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59 */
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60 void D_plsf_reset (D_plsfState *state)
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61 {
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62 Word16 i;
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63
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64 for (i = 0; i < M; i++){
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65 state->past_r_q[i] = 0; /* Past quantized prediction error */
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66 }
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67
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68 /* Past dequantized lsfs */
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69 Copy(mean_lsf, &state->past_lsf_q[0], M);
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70 }