coding: implement dedicated codec API for FACCH/[FH]
Currently FACCH/[FH] encoding and decoding is implemented as part of
the gsm0503_tch_[fh]r_{en,de}code and gsm0503_tch_a[fh]s_{en,de}code
API. This works fine for speech because one FACCH frame completely
replaces one or two speech frames, but this is not the case for CSD.
According to 3GPP TS 45.002, sections 4.2.5 and 4.3.5, for TCH data
channels FACCH does not replace data frames but disturbs some amount
of bits from them. Therefore we need to be able to perform FACCH
encoding and decoding independently from CSD specific coding API.
Change-Id: I0c7a9c180dcafe64e6aebe53518d3d11e1f29886
Related: OS#1572
diff --git a/include/osmocom/coding/gsm0503_coding.h b/include/osmocom/coding/gsm0503_coding.h
index c6181d8..75e12e6 100644
--- a/include/osmocom/coding/gsm0503_coding.h
+++ b/include/osmocom/coding/gsm0503_coding.h
@@ -109,4 +109,12 @@
int gsm0503_tch_fr144_decode(ubit_t *data, const sbit_t *bursts,
int *n_errors, int *n_bits_total);
+int gsm0503_tch_fr_facch_encode(ubit_t *bursts, const uint8_t *data);
+int gsm0503_tch_fr_facch_decode(uint8_t *data, const sbit_t *bursts,
+ int *n_errors, int *n_bits_total);
+
+int gsm0503_tch_hr_facch_encode(ubit_t *bursts, const uint8_t *data);
+int gsm0503_tch_hr_facch_decode(uint8_t *data, const sbit_t *bursts,
+ int *n_errors, int *n_bits_total);
+
/*! @} */