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annotate libgsmfr2/dhf.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 c94d9a336e8f
children
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6780b23654bd libgsmfrp: starting with the silence frame
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1 /*
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c94d9a336e8f libgsmfr2: implement DHF const datum
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2 * Implementation of the optional decoder homing feature requires matching
c94d9a336e8f libgsmfr2: implement DHF const datum
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3 * the input RTP-encoded GSM-FR frame against the known decoder homing frame.
c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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4 * This C module provides this DHF as an API-exported const array.
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6780b23654bd libgsmfrp: starting with the silence frame
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5 */
6780b23654bd libgsmfrp: starting with the silence frame
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a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
Mychaela Falconia <falcon@freecalypso.org>
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7 #include <stdint.h>
a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
Mychaela Falconia <falcon@freecalypso.org>
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8 #include "tw_gsmfr.h"
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6780b23654bd libgsmfrp: starting with the silence frame
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c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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10 const uint8_t gsmfr_decoder_homing_frame[GSMFR_RTP_FRAME_LEN] = {
c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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11 0xD2, 0x57, 0x7A, 0x1C, 0xDA,
c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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12 0x50, 0x00, 0x49, 0x24, 0x92, 0x49, 0x24,
c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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13 0x50, 0x00, 0x49, 0x24, 0x92, 0x49, 0x24,
c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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14 0x50, 0x00, 0x49, 0x24, 0x92, 0x49, 0x24,
c94d9a336e8f libgsmfr2: implement DHF const datum
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
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15 0x50, 0x00, 0x49, 0x23, 0x92, 0x49, 0x24,
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6780b23654bd libgsmfrp: starting with the silence frame
Mychaela Falconia <falcon@freecalypso.org>
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16 };