FreeCalypso > hg > gsm-net-reveng
view trau-decode/extr-fr.c @ 28:9bcdb091c24d default tip
trau-decode: new program trau-hr-dump
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 18 Aug 2024 08:37:02 +0000 |
parents | 0565aaa84b17 |
children |
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/* * This module implements the FR decoding part of trau-extr. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <tw_gsmfr.h> /* this corresponds to the bit-lengths of the individual codec * parameters as indicated in Table 1.1 of TS 46.010 */ static const uint8_t gsm_fr_map[GSMFR_NUM_PARAMS] = { 6, 6, 5, 5, 4, 4, 3, 3, 7, 2, 2, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 2, 2, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 2, 2, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 2, 2, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 }; static unsigned get_le(bits, nbits) uint8_t *bits; unsigned nbits; { unsigned accum, mask; unsigned n; accum = 0; mask = 1; for (n = 0; n < nbits; n++) { if (*bits) accum |= mask; bits++; mask <<= 1; } return accum; } static void dbits_to_params(d_bits, params) uint8_t *d_bits; int16_t *params; { unsigned np, len; uint8_t *ip; int16_t *op; ip = d_bits; op = params; for (np = 0; np < GSMFR_NUM_PARAMS; np++) { len = gsm_fr_map[np]; *op++ = get_le(ip, len); ip += len; } } void convert_fr_frame(d_bits, outf) uint8_t *d_bits; FILE *outf; { int16_t params[GSMFR_NUM_PARAMS]; uint8_t rtp_pack[GSMFR_RTP_FRAME_LEN]; dbits_to_params(d_bits, params); gsmfr_pack_from_array(params, rtp_pack); fwrite(rtp_pack, 1, GSMFR_RTP_FRAME_LEN, outf); }