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annotate libgsmefr/dtx_defs.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 c1d53064b410
children
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c1d53064b410 libgsmefr: split dtx.c into dtx_{common,dec,enc}.c
Mychaela Falconia <falcon@freecalypso.org>
parents: 67
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1 /*
c1d53064b410 libgsmefr: split dtx.c into dtx_{common,dec,enc}.c
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parents: 67
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2 * The definitions contained in this header file originally lived in
c1d53064b410 libgsmefr: split dtx.c into dtx_{common,dec,enc}.c
Mychaela Falconia <falcon@freecalypso.org>
parents: 67
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3 * dtx.c; they are being factored out into a new header file as part of
c1d53064b410 libgsmefr: split dtx.c into dtx_{common,dec,enc}.c
Mychaela Falconia <falcon@freecalypso.org>
parents: 67
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4 * splitting of dtx.c code into common, encoder-only and decoder-only
c1d53064b410 libgsmefr: split dtx.c into dtx_{common,dec,enc}.c
Mychaela Falconia <falcon@freecalypso.org>
parents: 67
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5 * parts.
c1d53064b410 libgsmefr: split dtx.c into dtx_{common,dec,enc}.c
Mychaela Falconia <falcon@freecalypso.org>
parents: 67
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6 */
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824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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8 /* Inverse values of DTX hangover period and DTX hangover period + 1 */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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10 #define INV_DTX_HANGOVER (0x7fff / DTX_HANGOVER)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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11 #define INV_DTX_HANGOVER_P1 (0x7fff / (DTX_HANGOVER+1))
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13 #define NB_PULSE 10 /* Number of pulses in fixed codebook excitation */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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15 /* Constant DTX_ELAPSED_THRESHOLD is used as threshold for allowing
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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16 SID frame updating without hangover period in case when elapsed
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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17 time measured from previous SID update is below 24 */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code
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19 #define DTX_ELAPSED_THRESHOLD (24 + DTX_HANGOVER - 1)