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annotate libtwamr/pre_big.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 38ee82480462
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 : pre_big.c
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11 * Purpose : Big subframe (2 subframes) preprocessing
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12 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "pre_big.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "syn_filt.h"
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33 #include "weight_a.h"
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34 #include "residu.h"
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35 #include "no_count.h"
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36 #include "cnst.h"
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37
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38 /*
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39 ********************************************************************************
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40 * PUBLIC PROGRAM CODE
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41 ********************************************************************************
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42 */
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43 int pre_big(
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44 enum Mode mode, /* i : coder mode */
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45 const Word16 gamma1[], /* i : spectral exp. factor 1 */
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46 const Word16 gamma1_12k2[],/* i : spectral exp. factor 1 for EFR */
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47 const Word16 gamma2[], /* i : spectral exp. factor 2 */
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48 Word16 A_t[], /* i : A(z) unquantized, for 4 subframes, Q12 */
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49 Word16 frameOffset, /* i : Start position in speech vector, Q0 */
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50 Word16 speech[], /* i : speech, Q0 */
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51 Word16 mem_w[], /* i/o: synthesis filter memory state, Q0 */
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52 Word16 wsp[] /* o : weighted speech Q0 */
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53 )
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54 {
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55 Word16 Ap1[MP1]; /* A(z) with spectral expansion */
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56 Word16 Ap2[MP1]; /* A(z) with spectral expansion */
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57 const Word16 *g1; /* Pointer to correct gammma1 vector */
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58 Word16 aOffset;
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59 Word16 i;
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60
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61 test ();
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62 if (sub (mode, MR795) <= 0 )
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63 {
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64 g1 = gamma1; move16 ();
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65 }
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66 else
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67 {
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68 g1 = gamma1_12k2; move16 ();
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69 }
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70
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71 test ();
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72 if (frameOffset > 0) {
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73 aOffset = 2*MP1; move16 ();
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74 }
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75 else {
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76 aOffset = 0; move16 ();
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77 }
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78
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79 /* process two subframes (which form the "big" subframe) */
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80 for (i = 0; i < 2; i++)
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81 {
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82 Weight_Ai(&A_t[aOffset], g1, Ap1);
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83 Weight_Ai(&A_t[aOffset], gamma2, Ap2);
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84 Residu(Ap1, &speech[frameOffset], &wsp[frameOffset], L_SUBFR);
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85
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86 Syn_filt(Ap2, &wsp[frameOffset], &wsp[frameOffset], L_SUBFR, mem_w, 1);
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87 aOffset = add (aOffset, MP1);
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88 frameOffset = add (frameOffset, L_SUBFR);
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89 }
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90
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91 return 0;
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92 }