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annotate libgsmfr2/enc_homing.c @ 605:63f774192906

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gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents 5fbb323b2978
children
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5fbb323b2978 libgsmfr2: implement encoder homing
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1 /*
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2 * This module contains our implementation of the optional homing feature
5fbb323b2978 libgsmfr2: implement encoder homing
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3 * for our GSM 06.10 encoder.
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4 */
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5
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6 #include <stdint.h>
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7 #include "tw_gsmfr.h"
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8
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9 void gsmfr_0610_encoder_homing(struct gsmfr_0610_state *st, const int16_t *pcm)
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10 {
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11 int i;
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12
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13 for (i = 0; i < 160; i++) {
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14 if (pcm[i] != 0x0008)
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15 return;
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16 }
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17 gsmfr_0610_reset(st);
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18 }