libosmocoding: migrate transcoding routines from OsmoBTS

There are some projects, such as GR-GSM and OsmocomBB, which would
benefit from using one shared implementation of GSM 05.03 code. So,
this commit introduces a new sub-library called libosmocoding, which
(for now) provides GSM, GPRS and EDGE transcoding routines, migrated
from OsmoBTS.

The original GSM 05.03 code from OsmoBTS was relicensed under
GPLv2-or-later with permission of copyright holders (Andreas Eversberg,
Alexander Chemeris and Tom Tsou).

The following data types are currently supported:

 - xCCH
 - PDTCH (CS 1-4 and MCS 1-9)
 - TCH/FR
 - TCH/HR
 - TCH/AFS
 - RCH/AHS
 - RACH
 - SCH

Change-Id: I0c3256b87686d878e4e716d12393cad5924fdfa1

1 files changed, 50 insertions, 0 deletions

diff --git a/include/osmocom/coding/gsm0503_tables.h b/include/osmocom/coding/gsm0503_tables.h
new file mode 100644
index 00000000..e6761ca4
--- /dev/null
+++ b/include/osmocom/coding/gsm0503_tables.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <stdint.h>
+#include <osmocom/core/bits.h>
+
+extern const ubit_t gsm0503_pdtch_hl_hn_ubit[4][8];
+extern const ubit_t gsm0503_pdtch_edge_hl_hn_ubit[3][8];
+extern const sbit_t gsm0503_pdtch_hl_hn_sbit[4][8];
+extern const sbit_t gsm0503_pdtch_edge_hl_hn_sbit[3][8];
+extern const ubit_t gsm0503_usf2six[8][6];
+extern const ubit_t gsm0503_usf2twelve_ubit[8][12];
+extern const sbit_t gsm0503_usf2twelve_sbit[8][12];
+extern const uint8_t gsm0503_puncture_cs2[588];
+extern const uint8_t gsm0503_puncture_cs3[676];
+extern const uint8_t gsm0503_puncture_mcs1_dl_hdr[108];
+extern const uint8_t gsm0503_puncture_mcs1_ul_hdr[117];
+extern const uint8_t gsm0503_puncture_mcs1_p1[588];
+extern const uint8_t gsm0503_puncture_mcs1_p2[588];
+extern const uint8_t gsm0503_puncture_mcs2_p1[732];
+extern const uint8_t gsm0503_puncture_mcs2_p2[732];
+extern const uint8_t gsm0503_puncture_mcs3_p1[948];
+extern const uint8_t gsm0503_puncture_mcs3_p2[948];
+extern const uint8_t gsm0503_puncture_mcs3_p3[948];
+extern const uint8_t gsm0503_puncture_mcs4_p1[1116];
+extern const uint8_t gsm0503_puncture_mcs4_p2[1116];
+extern const uint8_t gsm0503_puncture_mcs4_p3[1116];
+extern const uint8_t gsm0503_puncture_mcs5_p1[1404];
+extern const uint8_t gsm0503_puncture_mcs5_p2[1404];
+extern const uint8_t gsm0503_puncture_mcs6_p1[1836];
+extern const uint8_t gsm0503_puncture_mcs6_p2[1836];
+extern const uint8_t gsm0503_puncture_mcs7_dl_hdr[135];
+extern const uint8_t gsm0503_puncture_mcs7_ul_hdr[162];
+extern const uint8_t gsm0503_puncture_mcs7_p1[1404];
+extern const uint8_t gsm0503_puncture_mcs7_p2[1404];
+extern const uint8_t gsm0503_puncture_mcs7_p3[1404];
+extern const uint8_t gsm0503_puncture_mcs8_p1[1692];
+extern const uint8_t gsm0503_puncture_mcs8_p2[1692];
+extern const uint8_t gsm0503_puncture_mcs8_p3[1692];
+extern const uint8_t gsm0503_puncture_mcs9_p1[1836];
+extern const uint8_t gsm0503_puncture_mcs9_p2[1836];
+extern const uint8_t gsm0503_puncture_mcs9_p3[1836];
+extern const uint16_t gsm0503_interleave_mcs5[1248];
+extern const uint8_t gsm0503_gsm_fr_map[76];
+extern const uint8_t gsm0503_gsm_efr_protected_bits[65];
+extern const ubit_t gsm0503_afs_ic_ubit[4][8];
+extern const sbit_t gsm0503_afs_ic_sbit[4][8];
+extern const ubit_t gsm0503_ahs_ic_ubit[4][4];
+extern const sbit_t gsm0503_ahs_ic_sbit[4][4];
+extern const uint8_t gsm0503_tch_hr_interleaving[228][2];
+extern const ubit_t gsm0503_mcs5_usf_precode_table[8][36];