FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/bfi_nodata.c @ 187:6ad363f7ea30
libgsmefr/d1035pf.c: perf opt
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 03 Jan 2023 03:22:04 +0000 |
parents | 452c1d5a6268 |
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rev | line source |
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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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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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43 |
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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 } |