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annotate libgsmefr/bfi_nodata.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 452c1d5a6268
children
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1 /*
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2 * In the expected usage mode of our libgsmefr decoder as part of "soft TRAU"
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3 * uplink implementation, there will be times when the radio subsystem tells
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4 * us that a frame has been lost, but we don't have any errored bits to feed
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5 * to the decoder as ETSI canon calls for. Specifically, the canonical EFR
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6 * decoder will use the "fixed codebook excitation pulses" part of errored
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7 * frames when a BFI comes in after speech, although not when BFI comes in
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8 * after SID. Our solution in EFR_decode_bfi_nodata(): we look in the
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9 * decoder state to see if we are in speech mode, and if we are, we fill
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10 * the needed parameters with a PRNG.
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11 */
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12
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13 #include <string.h>
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14 #include "gsm_efr.h"
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15 #include "typedef.h"
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16 #include "namespace.h"
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17 #include "cnst.h"
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18 #include "dtx.h"
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19 #include "dec_state.h"
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20
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21 static void random_1035(Word32 *lfsr, Word16 *param_1035)
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22 {
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23 Word16 *p = param_1035;
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24 Word16 i;
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25
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26 /* 5 params of bit width 4 */
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27 for (i = 0; i < 5; i++)
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28 *p++ = pseudonoise(lfsr, 4);
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29 /* another 5 params of bit width 3 */
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30 for (i = 0; i < 5; i++)
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31 *p++ = pseudonoise(lfsr, 3);
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32 }
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33
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34 static void random_bad_frame(struct EFR_decoder_state *st, Word16 *params)
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35 {
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36 Word32 *lfsr = &st->L_pn_seed_nodata;
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37
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38 random_1035(lfsr, params + 7);
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39 random_1035(lfsr, params + 20);
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40 random_1035(lfsr, params + 33);
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41 random_1035(lfsr, params + 46);
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42 }
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44 void EFR_decode_bfi_nodata(struct EFR_decoder_state *st, int taf,
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45 int16_t *pcm_out)
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46 {
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47 int16_t params[EFR_NUM_PARAMS];
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48
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49 if (st->reset_flag_old) {
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50 memset(pcm_out, 0, sizeof(int16_t) * L_FRAME);
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51 return;
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52 }
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53 memset(params, 0, sizeof(int16_t) * EFR_NUM_PARAMS);
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54 if (st->rxdtx_ctrl & RX_SP_FLAG)
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55 random_bad_frame(st, params);
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56 EFR_decode_params(st, params, 1, 0, taf, pcm_out);
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57 }