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annotate libtwamr/dec_main.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 357d1faad55d
children
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1 /*
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2 * This C module is the top level entity for our stateful decoder engine.
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3 */
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4
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5 #include <stdint.h>
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6 #include <stdlib.h>
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7 #include <string.h>
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8 #include "tw_amr.h"
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9 #include "namespace.h"
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10 #include "typedef.h"
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11 #include "cnst.h"
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12 #include "dec_amr.h"
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13 #include "pstfilt.h"
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14 #include "post_pro.h"
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15 #include "bitno.h"
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16
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17 struct amr_decoder_state {
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18 Decoder_amrState dec;
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19 Post_FilterState pstfilt;
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20 Post_ProcessState posthp;
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21 enum Mode prev_mode;
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22 Flag is_homed;
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23 };
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24
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25 struct amr_decoder_state *amr_decoder_create(void)
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26 {
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27 struct amr_decoder_state *st;
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28
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29 st = malloc(sizeof(struct amr_decoder_state));
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30 if (st)
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31 amr_decoder_reset(st);
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32 return st;
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33 }
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34
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35 void amr_decoder_reset(struct amr_decoder_state *st)
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36 {
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37 Decoder_amr_reset(&st->dec, 0);
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38 Post_Filter_reset(&st->pstfilt);
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39 Post_Process_reset(&st->posthp);
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40 st->prev_mode = (enum Mode) 0;
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41 st->is_homed = 1;
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42 }
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43
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44 void amr_decode_frame(struct amr_decoder_state *st,
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45 const struct amr_param_frame *frame, int16_t *pcm)
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46 {
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47 enum Mode mode;
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48 Word16 parm[MAX_PRM_SIZE];
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49 Word16 Az_dec[AZ_SIZE];
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50 Word16 i;
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51
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52 /* fast home state handling needs to be first */
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53 if (st->is_homed && amr_check_dhf(frame, 1)) {
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54 for (i = 0; i < L_FRAME; i++)
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55 pcm[i] = EHF_MASK;
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56 return;
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57 }
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58 /* "unpack" into internal form */
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59 if (frame->type == RX_NO_DATA)
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60 mode = st->prev_mode;
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61 else {
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62 mode = frame->mode & 7;
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63 st->prev_mode = mode;
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64 }
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65 memcpy(parm, frame->param, prmno[mode] * sizeof(int16_t));
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66 /* now we can call the guts of the decoder */
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67 Decoder_amr(&st->dec, mode, parm, frame->type, pcm, Az_dec);
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68 Post_Filter(&st->pstfilt, mode, pcm, Az_dec);
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69 Post_Process(&st->posthp, pcm, L_FRAME);
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70 /*
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71 * The 3 lsbs of each speech sample typically won't be all 0
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72 * out of Post_Process(), hence we have to clear them explicitly
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73 * to maintain overall bit-exact operation.
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74 */
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75 for (i = 0; i < L_FRAME; i++)
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76 pcm[i] &= 0xFFF8;
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77 /* final check for full DHF */
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78 if (amr_check_dhf(frame, 0))
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79 amr_decoder_reset(st);
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80 else
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81 st->is_homed = 0;
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82 }