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annotate libgsmefr/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 ea89eb8291bf
children
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6780b23654bd libgsmfrp: starting with the silence frame
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1 /*
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2 * This C module provides the RTP-encoded form of EFR DHF as an API-exported
ea89eb8291bf libgsmefr: add RTP-encoded DHF const datum to public API
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3 * const array. It is not used by the library itself (DHF check in the decoder
ea89eb8291bf libgsmefr: add RTP-encoded DHF const datum to public API
Mychaela Falconia <falcon@freecalypso.org>
parents: 278
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4 * is done on the unpacked array of params, not on the RTP-encoded frame),
ea89eb8291bf libgsmefr: add RTP-encoded DHF const datum to public API
Mychaela Falconia <falcon@freecalypso.org>
parents: 278
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5 * but we provide this const datum as part of API because it may be useful
ea89eb8291bf libgsmefr: add RTP-encoded DHF const datum to public API
Mychaela Falconia <falcon@freecalypso.org>
parents: 278
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6 * to some users, and for consistency with libgsmfr2.
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6780b23654bd libgsmfrp: starting with the silence frame
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7 */
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a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
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9 #include <stdint.h>
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10 #include "gsm_efr.h"
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12 const uint8_t EFR_decoder_homing_frame[EFR_RTP_FRAME_LEN] = {
ea89eb8291bf libgsmefr: add RTP-encoded DHF const datum to public API
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13 0xC0, 0x85, 0xEB, 0x49, 0x0F, 0xAA, 0xD6, 0x03,
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14 0xE3, 0xA1, 0x86, 0x07, 0xB0, 0xC4, 0x2C, 0x08,
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parents: 278
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15 0x04, 0x80, 0x55, 0x80, 0x00, 0x00, 0x00, 0x00,
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parents: 278
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16 0x03, 0x6B, 0x00, 0x00, 0x00, 0x00, 0x00
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6780b23654bd libgsmfrp: starting with the silence frame
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17 };