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annotate libgsmfrp/state.c @ 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 286d5f097eb4
children
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3cd5ad24b1d4 libgsmfrp: implement internal state
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1 /*
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2 * In this module we implement allocation and initialization
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3 * of state structures for our GSM FR preprocessor.
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4 */
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286d5f097eb4 libgsmfrp: implement comfort noise generation
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6 #include <stdint.h>
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3cd5ad24b1d4 libgsmfrp: implement internal state
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include "gsm_fr_preproc.h"
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10 #include "internal.h"
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12 struct gsmfr_preproc_state *gsmfr_preproc_create(void)
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13 {
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14 struct gsmfr_preproc_state *st;
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16 st = malloc(sizeof(struct gsmfr_preproc_state));
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17 if (st)
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18 gsmfr_preproc_reset(st);
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19 return st;
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20 }
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22 void gsmfr_preproc_reset(struct gsmfr_preproc_state *st)
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23 {
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24 memset(st, 0, sizeof(struct gsmfr_preproc_state));
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286d5f097eb4 libgsmfrp: implement comfort noise generation
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25 st->cn_random_lfsr = PN_INITIAL_SEED;
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26 }