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annotate libgsmefr/dec_state.h @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents eefef9f6d533
children
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1 /*
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2 * In this header file we define our decoder state structure.
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3 * This decoder state structure is internal to libgsmefr,
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4 * NOT part of our external public interface!
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5 */
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6
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7 struct EFR_decoder_state {
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8 /* from agc.c */
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9 Word16 past_gain;
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10 /* from decoder.c */
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11 Word16 synth_buf[L_FRAME + M];
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12 Word16 reset_flag_old;
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13 /* from dec_12k2.c */
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14 Word16 old_exc[L_FRAME + PIT_MAX + L_INTERPOL];
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15 Word16 lsp_old[M];
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16 Word16 mem_syn[M];
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17 Word16 prev_bf;
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18 Word16 bf_state;
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19 /* from d_plsf_5.c */
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20 Word16 past_r2_q[M];
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21 Word16 past_lsf_q[M];
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22 Word16 lsf_p_CN[M];
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23 Word16 lsf_old_CN[M];
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24 Word16 lsf_new_CN[M];
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25 /* from d_gains.c */
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26 Word16 pbuf[5];
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27 Word16 past_gain_pit;
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28 Word16 prev_gp;
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29 Word16 gbuf[5];
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30 Word16 past_gain_code;
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31 Word16 prev_gc;
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32 Word16 gcode0_CN;
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33 Word16 gain_code_old_CN;
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34 Word16 gain_code_new_CN;
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35 Word16 gain_code_muting_CN;
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36 Word16 past_qua_en[4];
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37 Word16 pred[4];
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38 /* from dtx.c */
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39 Word16 rxdtx_ctrl;
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40 Word32 L_pn_seed_rx;
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41 Word16 rx_dtx_state;
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42 Word16 rxdtx_aver_period;
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43 Word16 rxdtx_N_elapsed;
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44 Word16 prev_SID_frames_lost;
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45 Word16 buf_p_rx;
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46 Word16 lsf_old_rx[DTX_HANGOVER][M];
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47 Word16 gain_code_old_rx[4 * DTX_HANGOVER];
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48 /* from dec_lag6.c */
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49 Word16 old_T0;
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50 /* from preemph.c */
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51 Word16 mem_pre;
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52 /* from pstfilt2.c */
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53 Word16 res2[L_SUBFR];
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54 Word16 mem_syn_pst[M];
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55 /* our own addition */
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56 Word32 L_pn_seed_nodata;
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57 };