FreeCalypso > hg > gsm-codec-lib
view dev/efr-bit-packing.c @ 477:4c9222d95647
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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/* * We would like to generate our EFR RTP frame packing and unpacking code * using bitter and sweet utilities from libgsm, so we'll end up packing * and unpacking EFR just like good old FR. However, because of our * slightly different approach, entering the spec file for bitter and sweet * manually would be tedious and error-prone, hence we are going to * generate it with this program. */ #include <stdio.h> #include <stdlib.h> #define PRM_NO 57 /* table from ETSI EFR code */ static const unsigned bitno[PRM_NO] = { 7, 8, 9, 8, 6, /* LSP VQ */ 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* first subframe */ 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* second subframe */ 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* third subframe */ 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5 /* fourth subframe */ }; main(argc, argv) char **argv; { unsigned n; printf("EFR_MAGIC\t4\n"); for (n = 0; n < PRM_NO; n++) printf("params[%u]\t%u\n", n, bitno[n]); exit(0); }