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annotate libtest/roberead.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 9814041e8096
children
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a3aa152c4653 libtest: pcmwrite helper function and module
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1 /*
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2 * Here we implement our PCM read helper function for "robe" format.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdint.h>
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7 #include "roberead.h"
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8
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9 int robe_get_pcm_block(FILE *inf, int16_t *pcm)
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10 {
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11 uint8_t bytes[320], *dp;
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12 int cc, i;
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13
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14 cc = fread(bytes, 1, 320, inf);
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15 cc >>= 1;
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16 dp = bytes;
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17 for (i = 0; i < cc; i++) {
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18 pcm[i] = (dp[0] << 8) | dp[1];
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19 dp += 2;
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20 }
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21 while (i < 160)
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22 pcm[i++] = 0;
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23 return cc;
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24 }