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annotate libtest/pcmwrite.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 a3aa152c4653
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 write helper function.
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3 */
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4
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5 #include <stdint.h>
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6 #include "wavwriter.h"
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7 #include "pcmwrite.h"
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8
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9 void write_pcm_to_wav(void *wav, const int16_t *pcm)
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10 {
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11 uint8_t bytes[320], *dp;
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12 int16_t samp;
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13 unsigned n;
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14
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15 dp = bytes;
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16 for (n = 0; n < 160; n++) {
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17 samp = pcm[n];
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18 *dp++ = samp & 0xFF;
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19 *dp++ = (samp >> 8) & 0xFF;
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20 }
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21 wav_write_data(wav, bytes, 320);
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22 }