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annotate libgsmefr/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 18866c0354ef
children
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1 /*
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2 * This module contains our GSM EFR decoder main function, EFR_decode_params(),
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3 * that stands at the boundary between our public interface and the guts of
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4 * ETSI-based codec.
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5 */
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6
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7 #include "gsm_efr.h"
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8 #include "typedef.h"
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9 #include "namespace.h"
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10 #include "basic_op.h"
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11 #include "cnst.h"
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12 #include "codec.h"
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13 #include "sig_proc.h"
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14 #include "memops.h"
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15 #include "dec_state.h"
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16 #include "d_homing.h"
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17
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18 /* These constants define the number of consecutive parameters
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19 that function decoder_homing_frame_test() checks */
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20
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21 #define WHOLE_FRAME 57
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22 #define TO_FIRST_SUBFRAME 18
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23
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24 void EFR_decode_params(struct EFR_decoder_state *st, const int16_t *params,
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25 int bfi, int SID_flag, int TAF, int16_t *pcm_out)
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26 {
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27 Word16 *synth = st->synth_buf + M;
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28 Word16 Az_dec[AZ_SIZE];
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29 Word16 i, temp;
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30 Word16 reset_flag;
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31
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32 if (!bfi) /* BFI == 0, perform DHF check */
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33 {
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34 if (st->reset_flag_old) /* Check for second and further
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35 successive DHF (to first subfr.) */
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36 {
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37 reset_flag = decoder_homing_frame_test (params,
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38 TO_FIRST_SUBFRAME);
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39 }
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40 else
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41 {
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42 reset_flag = 0;
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43 }
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44 }
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45 else /* BFI==1, bypass DHF check (frame
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46 is taken as not being a DHF) */
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47 {
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48 reset_flag = 0;
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49 }
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50
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51 if (reset_flag && st->reset_flag_old)
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52 {
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53 /* Force the output to be the encoder homing frame pattern */
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54
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55 for (i = 0; i < L_FRAME; i++)
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56 {
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57 synth[i] = EHF_MASK;
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58 }
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59 }
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60 else
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61 {
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62 /* Synthesis */
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63 Decoder_12k2 (st, bfi, params, synth, Az_dec, TAF, SID_flag);
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64
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65 Post_Filter (st, synth, Az_dec); /* Post-filter */
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66
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67 for (i = 0; i < L_FRAME; i++)
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68 /* Upscale the 15 bit linear PCM to 16 bits,
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69 then truncate to 13 bits */
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70 {
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71 temp = shl (synth[i], 1);
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72 synth[i] = temp & 0xfff8;
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73 }
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74 } /* else */
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75
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76 Copy (synth, pcm_out, L_FRAME);
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77
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78 /* BFI == 0, perform check for first DHF (whole frame) */
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79 if (!bfi && !st->reset_flag_old)
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80 {
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81 reset_flag = decoder_homing_frame_test (params, WHOLE_FRAME);
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82 }
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83
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84 if (reset_flag)
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85 {
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86 /* Bring the decoder and receive DTX to the home state */
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87 EFR_decoder_reset(st);
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88 } else {
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89 st->reset_flag_old = 0;
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90 }
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91 }