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annotate libgsmefr/enc_main.c @ 122:b33f2168fdec

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doc/EFR-rationale article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 10 Dec 2022 08:51:01 +0000
parents 035424a6ca83
children
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1 /*
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2 * This module contains our GSM EFR encoder main function, EFR_encode_params(),
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3 * that stands at the boundary between our public interface and the guts of
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4 * ETSI-based codec.
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5 */
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6
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7 #include "gsm_efr.h"
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8 #include "typedef.h"
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9 #include "namespace.h"
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10 #include "basic_op.h"
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11 #include "cnst.h"
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12 #include "codec.h"
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13 #include "sig_proc.h"
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14 #include "memops.h"
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15 #include "enc_state.h"
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16 #include "e_homing.h"
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17 #include "dtx.h"
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18
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19 void EFR_encode_params(struct EFR_encoder_state *st, const int16_t *pcm_in,
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20 int16_t *params, int *sp_out, int *vad_out)
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21 {
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22 Word16 *new_speech = st->old_speech + L_TOTAL - L_FRAME;
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23 Word16 syn[L_FRAME];
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24 Word16 reset_flag;
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25 Word16 i;
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26
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27 /* Check whether this frame is an encoder homing frame */
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28 reset_flag = encoder_homing_frame_test (pcm_in);
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30 for (i = 0; i < L_FRAME; i++) /* Delete the 3 LSBs (13-bit input) */
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31 {
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32 new_speech[i] = pcm_in[i] & 0xfff8;
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33 }
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34
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35 Pre_Process (st, new_speech, L_FRAME); /* filter + downscaling */
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36
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37 Coder_12k2 (st, params, syn); /* Find speech parameters */
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38
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39 if ((st->txdtx_ctrl & TX_SP_FLAG) == 0)
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40 {
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41 /* Write comfort noise parameters into the parameter frame.
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42 Use old parameters in case SID frame is not to be updated */
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43 CN_encoding (st, params, st->txdtx_ctrl);
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44 }
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45
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46 /* VAD and SP flag outputs */
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47 if (vad_out)
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48 *vad_out = ((st->txdtx_ctrl & TX_VAD_FLAG) != 0);
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49
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50 if (sp_out)
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51 *sp_out = ((st->txdtx_ctrl & TX_SP_FLAG) != 0);
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52
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53 if (reset_flag != 0)
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54 {
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55 /* Bring the encoder, VAD and DTX to the home state */
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56 EFR_encoder_reset(st, st->dtx_mode);
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57 }
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58 }