FreeCalypso > hg > gsm-net-reveng
changeset 5:bf5c9fb431b8
trau-parse: implement EFR decoding
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 24 May 2024 09:34:36 +0000 |
| parents | d9c095357c32 |
| children | 50f73e4d09e8 |
| files | trau-decode/Makefile trau-decode/parse-efr.c trau-decode/parse-main.c |
| diffstat | 3 files changed, 60 insertions(+), 1 deletions(-) [+] |
line wrap: on
line diff
--- a/trau-decode/Makefile Fri May 24 09:16:35 2024 +0000 +++ b/trau-decode/Makefile Fri May 24 09:34:36 2024 +0000 @@ -5,7 +5,7 @@ all: ${PROGS} trau-parse: crc8gen.o parse-fr.o parse-efr.o parse-main.o - ${CC} ${CFLAGS} -o $@ $^ -lgsmfr2 + ${CC} ${CFLAGS} -o $@ $^ -lgsmfr2 -lgsmefr clean: rm -f *.o ${PROGS}
--- a/trau-decode/parse-efr.c Fri May 24 09:16:35 2024 +0000 +++ b/trau-decode/parse-efr.c Fri May 24 09:34:36 2024 +0000 @@ -83,3 +83,61 @@ rc3 ? "bad" : "good", rc4 ? "bad" : "good", rc5 ? "bad" : "good"); } + +static void +dbits_to_frame(d_bits, frame) + ubit_t *d_bits; + uint8_t *frame; +{ + ubit_t intermed[248], *ip; + uint8_t *op, mask; + unsigned nb; + + intermed[0] = 1; + intermed[1] = 1; + intermed[2] = 0; + intermed[3] = 0; + bcopy(d_bits + 1, intermed + 4, 38); + bcopy(d_bits + 42, intermed + 42, 53); + bcopy(d_bits + 98, intermed + 95, 50); + bcopy(d_bits + 151, intermed + 145, 53); + bcopy(d_bits + 207, intermed + 198, 50); + ip = intermed; + op = frame; + for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) { + *op = 0; + for (mask = 0x80; mask; mask >>= 1) { + if (*ip) + *op |= mask; + ip++; + } + op++; + } +} + +void +print_efr_frame(d_bits) + ubit_t *d_bits; +{ + uint8_t frame[EFR_RTP_FRAME_LEN]; + int16_t params[EFR_NUM_PARAMS]; + int i, j, n, sid; + + dbits_to_frame(d_bits, frame); + EFR_frame2params(frame, params); + fputs(" EFR frame:\n LPC", stdout); + n = 0; + for (i = 0; i < 5; i++) + printf(" %d", params[n++]); + putchar('\n'); + for (i = 0; i < 4; i++) { + fputs(" ", stdout); + for (j = 0; j < 13; j++) + printf(" %d", params[n++]); + putchar('\n'); + } + sid = EFR_sid_classify(frame); + printf(" SID recompute: %d\n", sid); + if (!bcmp(frame, EFR_decoder_homing_frame, EFR_RTP_FRAME_LEN)) + puts(" Matches DHF"); +}