FreeCalypso > hg > gsm-codec-lib

annotate dev/efr-bit-packing.c @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 9639a44ae2e7
children
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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
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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
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6 * manually would be tedious and error-prone, hence we are going to
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7 * generate it with this program.
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8 */
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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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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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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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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 }