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annotate libgsmefr/sid_insert.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents b4db5366b595
children
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b4db5366b595 libgsmefr: implement SID code word insertion
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1 /*
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2 * EFR_insert_sid_codeword() inserts the 95 bit wide SID codeword into
b4db5366b595 libgsmefr: implement SID code word insertion
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3 * an EFR frame in RTP encoding, normally as part of EFR_encode_frame()
b4db5366b595 libgsmefr: implement SID code word insertion
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4 * processing right after EFR_params2frame().
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5 */
b4db5366b595 libgsmefr: implement SID code word insertion
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6
b4db5366b595 libgsmefr: implement SID code word insertion
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7 #include "gsm_efr.h"
b4db5366b595 libgsmefr: implement SID code word insertion
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8
b4db5366b595 libgsmefr: implement SID code word insertion
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9 void EFR_insert_sid_codeword(uint8_t *frame)
b4db5366b595 libgsmefr: implement SID code word insertion
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10 {
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11 frame[6] |= 0x6F;
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12 frame[7] = 0xFF;
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13 frame[8] = 0xFF;
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14 frame[9] |= 0x80;
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15 frame[12] |= 0x3B;
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16 frame[13] = 0xFF;
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17 frame[14] = 0xFF;
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18 frame[15] |= 0xE0;
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19 frame[19] = 0xFF;
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20 frame[20] = 0xFF;
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21 frame[21] = 0xFF;
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22 frame[25] = 0xFF;
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23 frame[26] |= 0xFC;
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24 frame[27] = 0xFF;
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25 frame[28] |= 0xC0;
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26 }