FreeCalypso > hg > gsm-net-reveng
view trau-decode/parse-fr-common.c @ 94:f9ef582c199c
tfo-ut: check in tfo-fr.bin and tfo-efr.bin
Each of these binary files is an extract from MSC-side E1 timeslot
recording in a Nokia TCSM2 TFO session involving a cross-connect
between two TRAU channels. The extracts have been chosen to begin
at the point where the TRAU starts emitting TFO frames, thereby
beginning with a series of TFO frames that contain an embedded
TFO_TRANS message. In each experiment, one of the two cross-connected
TRAU channels emitted two "plain" TFO frames (not containing embedded
TFO messages) in between the initial embedded TFO_TRANS and the
subsequent embedded TFO_REQ_L; this channel was chosen for the
present extracts. Each extract is thus 2560 PCM samples, containing
16 aligned TFO frames: 5 carrying TFO_TRANS, 2 plain, 9 carrying
TFO_REQ_L.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Tue, 18 Mar 2025 22:56:23 +0000 |
| parents | d4ee42801cdc |
| children |
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/* * This module contains a bit of code that has been factored out of * trau-parse and tfo-parse-fr16 programs; it handles FR and EFR codecs. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> static void collect_d_bits(frame_bits, d_bits) uint8_t *frame_bits, *d_bits; { bcopy(frame_bits + 33, d_bits, 15); bcopy(frame_bits + 49, d_bits + 15, 15); bcopy(frame_bits + 65, d_bits + 30, 15); bcopy(frame_bits + 81, d_bits + 45, 15); bcopy(frame_bits + 97, d_bits + 60, 15); bcopy(frame_bits + 113, d_bits + 75, 15); bcopy(frame_bits + 129, d_bits + 90, 15); bcopy(frame_bits + 145, d_bits + 105, 15); bcopy(frame_bits + 161, d_bits + 120, 15); bcopy(frame_bits + 177, d_bits + 135, 15); bcopy(frame_bits + 193, d_bits + 150, 15); bcopy(frame_bits + 209, d_bits + 165, 15); bcopy(frame_bits + 225, d_bits + 180, 15); bcopy(frame_bits + 241, d_bits + 195, 15); bcopy(frame_bits + 257, d_bits + 210, 15); bcopy(frame_bits + 273, d_bits + 225, 15); bcopy(frame_bits + 289, d_bits + 240, 15); bcopy(frame_bits + 305, d_bits + 255, 5); } void print_fr_efr_frame(frame_bits, c1_5) uint8_t *frame_bits; unsigned c1_5; { uint8_t d_bits[260]; switch (c1_5) { case 0x02: case 0x1C: collect_d_bits(frame_bits, d_bits); print_fr_frame(d_bits); break; case 0x1A: collect_d_bits(frame_bits, d_bits); check_efr_crc(d_bits); print_efr_frame(d_bits); break; } }
