FreeCalypso > hg > gsm-codec-lib
annotate dev/efr-bit-packing.c @ 183:452c1d5a6268
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> |
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date | Tue, 03 Jan 2023 00:12:18 +0000 |
parents | 9639a44ae2e7 |
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rev | line source |
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1 /* |
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2 * We would like to generate our EFR RTP frame packing and unpacking code |
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3 * using bitter and sweet utilities from libgsm, so we'll end up packing |
9639a44ae2e7
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4 * and unpacking EFR just like good old FR. However, because of our |
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5 * slightly different approach, entering the spec file for bitter and sweet |
9639a44ae2e7
dev: efr-bit-packing helper program
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6 * manually would be tedious and error-prone, hence we are going to |
9639a44ae2e7
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7 * generate it with this program. |
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8 */ |
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9 |
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10 #include <stdio.h> |
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11 #include <stdlib.h> |
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12 |
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13 #define PRM_NO 57 |
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14 |
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15 /* table from ETSI EFR code */ |
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16 static const unsigned bitno[PRM_NO] = |
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17 { |
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18 7, 8, 9, 8, 6, /* LSP VQ */ |
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19 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* first subframe */ |
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20 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* second subframe */ |
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21 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* third subframe */ |
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22 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5 /* fourth subframe */ |
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23 }; |
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24 |
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25 main(argc, argv) |
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26 char **argv; |
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27 { |
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28 unsigned n; |
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29 |
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30 printf("EFR_MAGIC\t4\n"); |
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31 for (n = 0; n < PRM_NO; n++) |
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32 printf("params[%u]\t%u\n", n, bitno[n]); |
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33 exit(0); |
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34 } |