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annotate libgsmefr/bfi_nodata.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +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 }