FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/bfi_nodata.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents 452c1d5a6268
children
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7152cc7d1ca3 libgsmefr: implement EFR_decode_bfi_nodata()
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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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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 }