This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/gerrit-log@lists.osmocom.org/.
laforge gerrit-no-reply at lists.osmocom.orglaforge has uploaded this change for review. ( https://gerrit.osmocom.org/c/libosmo-abis/+/18249 )
Change subject: WIP: trau_frame: New API
......................................................................
WIP: trau_frame: New API
Change-Id: I5cf42e6c445d9224be18503cebc7584b3beba08c
---
M include/osmocom/abis/trau_frame.h
M src/trau_frame.c
2 files changed, 1,295 insertions(+), 2 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmo-abis refs/changes/49/18249/1
diff --git a/include/osmocom/abis/trau_frame.h b/include/osmocom/abis/trau_frame.h
index 0f3d1d2..f14b439 100644
--- a/include/osmocom/abis/trau_frame.h
+++ b/include/osmocom/abis/trau_frame.h
@@ -21,6 +21,7 @@
*/
#include <stdint.h>
+#include <stdbool.h>
#include <osmocom/core/bits.h>
/*! \defgroup trau_frame TRAU frame handling
@@ -29,6 +30,10 @@
* \file trau_frame.h
*/
+/*********************************************************************************
+ * Old API
+ *********************************************************************************/
+
/*! \brief Maximum number of C-bits in a TRAU frame:
* 21 for FR/EFR, 25 for AMR, 15 for OM, 15 for data, 13 for E-data, 21 idle */
#define MAX_C_BITS 25
@@ -41,6 +46,8 @@
#define MAX_S_BITS 6
/*! \brief Maximum number of M-bits in a TRAU frame for E-data */
#define MAX_M_BITS 2
+/*! \brief Maximum number of XC-bits in a TRAU frame for 8k */
+#define MAX_XC_BITS 6
/*! \brief a decoded TRAU frame, extracted C/D/T/S/M bits */
struct decoded_trau_frame {
@@ -51,6 +58,7 @@
ubit_t m_bits[MAX_M_BITS];
};
+/*! 16k sub-slot types: Bits C1..C5 */
#define TRAU_FT_FR_UP 0x02 /* 0 0 0 1 0 - 3.5.1.1.1 */
#define TRAU_FT_HR_UP 0x03 /* 0 0 0 1 1 - TS 08.61 5.1.4.1.1 */
#define TRAU_FT_FR_DOWN 0x1c /* 1 1 1 0 0 - 3.5.1.1.1 */
@@ -62,12 +70,19 @@
#define TRAU_FT_DATA_UP 0x08 /* 0 1 0 0 0 - 3.5.3 */
#define TRAU_FT_DATA_UP_HR 0x09 /* 0 1 0 0 1 - TS 08.61 5.1.4.2 */
#define TRAU_FT_DATA_DOWN 0x16 /* 1 0 1 1 0 - 3.5.3 */
-#define TRAU_FT_DATA_DOWN_HR 0x17 /* 0 1 0 0 1 - TS 08.61 5.1.4.2 */
+#define TRAU_FT_DATA_DOWN_HR 0x17 /* 1 0 1 1 1 - TS 08.61 5.1.4.2 */
#define TRAU_FT_D145_SYNC 0x14 /* 1 0 1 0 0 - 3.5.3 */
#define TRAU_FT_EDATA 0x1f /* 1 1 1 1 1 - 3.5.4 */
#define TRAU_FT_IDLE_UP 0x10 /* 1 0 0 0 0 - 3.5.5 */
#define TRAU_FT_IDLE_DOWN 0x0e /* 0 1 1 1 0 - 3.5.5 */
+/* 8k sub-slot types: Bits C1..C5*/
+#define TRAU8_FT_SPEECH_UP 0x02 /* 0 0 0 1 P - TS 08.61 5.2.4.1.1 */
+#define TRAU8_FT_DATA_UP 0x06 /* 0 0 1 1 P - TS 08.61 5.2.4.1.1 */
+#define TRAU8_FT_OM_UP 0x0a /* 0 1 0 1 P - TS 08.61 5.2.4.1.1 */
+#define TRAU8_FT_SPEECH_DOWN 0x00 /* 0 0 0 U P - TS 08.61 5.2.4.1.2 */
+#define TRAU8_FT_DATA_DOWN 0x04 /* 0 0 1 U P - TS 08.61 5.2.4.1.2 */
+#define TRAU8_FT_OM_DOWN 0x08 /* 0 1 0 U P - TS 08.61 5.2.4.1.2 */
int decode_trau_frame(struct decoded_trau_frame *fr, const ubit_t *trau_bits);
int encode_trau_frame(ubit_t *trau_bits, const struct decoded_trau_frame *fr);
@@ -75,6 +90,74 @@
ubit_t *trau_idle_frame(void);
+
+/*********************************************************************************
+ * New API
+ *********************************************************************************/
+
+enum osmo_trau_frame_type {
+ OSMO_TRAU16_FT_NONE,
+ OSMO_TRAU16_FT_FR = 1,
+ OSMO_TRAU16_FT_HR,
+ OSMO_TRAU16_FT_EFR,
+ OSMO_TRAU16_FT_AMR,
+ OSMO_TRAU16_FT_OAM,
+ OSMO_TRAU16_FT_DATA,
+ OSMO_TRAU16_FT_EDATA,
+ OSMO_TRAU16_FT_D145_SYNC,
+ OSMO_TRAU16_FT_DATA_HR,
+ OSMO_TRAU16_FT_IDLE,
+
+ OSMO_TRAU8_SPEECH,
+ OSMO_TRAU8_DATA,
+ OSMO_TRAU8_OAM,
+ OSMO_TRAU8_AMR_LOW,
+ OSMO_TRAU8_AMR_6k7,
+ OSMO_TRAU8_AMR_7k4,
+};
+
+enum osmo_trau_frame_direction {
+ OSMO_TRAU_DIR_UL = 0,
+ OSMO_TRAU_DIR_DL = 1,
+};
+
+struct osmo_trau_frame {
+ enum osmo_trau_frame_type type;
+ enum osmo_trau_frame_direction dir;
+
+ ubit_t c_bits[MAX_C_BITS];
+ ubit_t d_bits[MAX_D_BITS];
+ ubit_t t_bits[MAX_T_BITS];
+ ubit_t s_bits[MAX_S_BITS];
+ ubit_t m_bits[MAX_M_BITS];
+ ubit_t ufi; /*!< Unreliable Frame Indication (HR) */
+ ubit_t crc_bits[3]; /*!< CRC0..CRC2 (HR) */
+ ubit_t xc_bits[MAX_XC_BITS]; /*!< XC1..XC6 (8k) */
+};
+
+/*! decode an 8k TRAU frame
+ * \param[out] fr caller-allocated output data structure
+ * \param[in] bits unpacked input bits
+ * \param[in] dir direction
+ * \return 0 on success; negative in case of error */
+int osmo_trau_frame_decode_8k(struct osmo_trau_frame *fr, const ubit_t *bits,
+ enum osmo_trau_frame_direction dir);
+
+/*! decode an 16k TRAU frame
+ * \param[out] fr caller-allocated output data structure
+ * \param[in] bits unpacked input bits
+ * \param[in] dir direction
+ * \return 0 on success; negative in case of error */
+int osmo_trau_frame_decode_16k(struct osmo_trau_frame *fr, const ubit_t *bits,
+ enum osmo_trau_frame_direction dir);
+
+/*! encode a TRAU frame
+ * \param[out] bits caller-allocated memory for unpacked output bits
+ * \param[out] fr input data structure describing TRAU frame
+ * \return number of bits encoded */
+int osmo_trau_frame_encode(ubit_t *bits, size_t n_bits, const struct osmo_trau_frame *fr);
+
+
/* }@ */
#endif /* _TRAU_FRAME_H */
diff --git a/src/trau_frame.c b/src/trau_frame.c
index bc6c5bf..c990c1d 100644
--- a/src/trau_frame.c
+++ b/src/trau_frame.c
@@ -1,4 +1,4 @@
-/* TRAU frame handling according to GSM TS 08.60 */
+/* TRAU frame handling according to GSM TS 08.60 + 08.61 */
/* (C) 2009,2020 by Harald Welte <laforge at gnumonks.org>
* All Rights Reserved
@@ -37,6 +37,10 @@
* \file trau_frame.c
*/
+/*********************************************************************************
+ * Old API; introduced in 2009 for original bs11_abis/OsmoNITB
+ *********************************************************************************/
+
static uint32_t get_bits(const ubit_t *bitbuf, int offset, int num)
{
int i;
@@ -480,4 +484,1210 @@
return encoded_idle_frame;
}
+/*********************************************************************************
+ * New API; introduced in 2020 for use by osmo-mgw
+ *********************************************************************************/
+
+/* 16k sub-slots */
+static const ubit_t ft_fr_up_bits[5] = { 0, 0, 0, 1, 0 };
+static const ubit_t ft_data_up_bits[5] = { 0, 1, 0, 0, 0 };
+static const ubit_t ft_idle_up_bits[5] = { 1, 0, 0, 0, 0 };
+static const ubit_t ft_efr_bits[5] = { 1, 1, 0, 1, 0 };
+static const ubit_t ft_amr_bits[5] = { 0, 0, 1, 1, 0 };
+static const ubit_t ft_oam_up_bits[5] = { 0, 0, 1, 0, 1 };
+static const ubit_t ft_oam_down_bits[5] = { 1, 1, 0, 1, 1 };
+static const ubit_t ft_d145s_bits[5] = { 1, 0, 1, 0, 0 };
+static const ubit_t ft_edata_bits[5] = { 1, 1, 1, 1, 1 };
+
+/* 8k sub-slots */
+static const ubit_t ft_hr_up_bits[5] = { 0, 0, 0, 1, 1 };
+static const ubit_t ft_hr_down_bits[5] = { 1, 1, 1, 0, 1 };
+static const ubit_t ft_data_hr_up_bits[5] = { 0, 1, 0, 0, 1 };
+static const ubit_t ft_data_hr_down_bits[5] = { 1, 0, 1, 1, 1 };
+
+
+/* generate the sync pattern described in TS 08.60 4.8.1 */
+static void encode_sync16(ubit_t *trau_bits)
+{
+ int i;
+
+ /* 16 '0' bits in header */
+ memset(trau_bits, 0, 16);
+ /* '1'-bit in regular intervals */
+ for (i = 16; i < 40*8; i += 16)
+ trau_bits[i] = 1;
+}
+
+/* TS 08.60 Section 3.1.1 */
+static int encode16_fr(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ const ubit_t *cbits5;
+ int i;
+ int d_idx = 0;
+
+ switch (fr->type) {
+ case OSMO_TRAU16_FT_IDLE:
+ if (fr->dir == OSMO_TRAU_DIR_UL)
+ cbits5 = ft_idle_up_bits;
+ else
+ cbits5 = ft_idle_down_bits;
+ break;
+ case OSMO_TRAU16_FT_FR:
+ if (fr->dir == OSMO_TRAU_DIR_UL)
+ cbits5 = ft_fr_up_bits;
+ else
+ cbits5 = ft_fr_down_bits;
+ break;
+ case OSMO_TRAU16_FT_EFR:
+ cbits5 = ft_efr_bits;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ encode_sync16(trau_bits);
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5 + 0, 5);
+ /* C6 .. C15 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5);
+ /* D1 .. D255 */
+ for (i = 32; i < 304; i += 16) {
+ trau_bits[i] = 1;
+ memcpy(trau_bits + i + 1, fr->d_bits + d_idx, 15);
+ d_idx += 15;
+ }
+ /* D256 .. D260 */
+ trau_bits[304] = 1;
+ memcpy(trau_bits + 305, fr->d_bits + d_idx, 5);
+ /* C16 .. C21 */
+ memcpy(trau_bits + 310, fr->c_bits + 15, 6);
+
+ /* FIXME: handle timing adjustment */
+
+ /* T1 .. T4 */
+ memcpy(trau_bits + 316, fr->t_bits+0, 4);
+
+ return 40 * 8;
+}
+
+/* TS 08.60 Section 3.1.1 */
+static int decode16_fr(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i;
+ int d_idx = 0;
+
+ /* C1 .. C15 */
+ memcpy(fr->c_bits + 0, trau_bits + 17, 15);
+ /* C16 .. C21 */
+ memcpy(fr->c_bits + 15, trau_bits + 310, 6);
+ /* T1 .. T4 */
+ memcpy(fr->t_bits + 0, trau_bits + 316, 4);
+ /* D1 .. D255 */
+ for (i = 32; i < 304; i+= 16) {
+ memcpy(fr->d_bits + d_idx, trau_bits + i + 1, 15);
+ d_idx += 15;
+ }
+ /* D256 .. D260 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 305, 5);
+
+ return 0;
+}
+
+/* TS 08.60 Section 3.1.2 */
+static int encode16_amr(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ const ubit_t *cbits5 = ft_amr_bits;
+ int i, d_idx;
+
+ encode_sync16(trau_bits);
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5 + 0, 5);
+ /* C6 .. C15 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5);
+
+ trau_bits[32] = 1;
+ /* C16 .. C25 */
+ memcpy(trau_bits + 33, fr->c_bits + 15, 10);
+ /* D1 .. D5 */
+ memcpy(trau_bits + 43, fr->d_bits + 0, 5);
+
+ /* D6 .. D256 */
+ for (i = 48, d_idx = 5; i <= 315; i += 16, d_idx += 15) {
+ trau_bits[i] = 1;
+ memcpy(trau_bits + i + 1, fr->d_bits + d_idx, 15);
+ }
+
+ /* FIXME: handle timing adjustment */
+
+ /* T1 .. T4 */
+ memcpy(trau_bits + 316, fr->t_bits + 0, 4);
+
+ return 40 * 8;
+}
+
+/* TS 08.60 Section 3.1.2 */
+static int decode16_amr(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i;
+ int d_idx = 0;
+
+ /* C1 .. C15 */
+ memcpy(fr->c_bits + 0, trau_bits + 17, 15);
+ /* C16 .. C25 */
+ memcpy(fr->c_bits + 15, trau_bits + 33, 10);
+ /* T1 .. T4 */
+ memcpy(fr->t_bits + 0, trau_bits + 316, 4);
+ /* D1 .. D5 */
+ memcpy(fr->d_bits, trau_bits + 43, 5);
+ d_idx += 5;
+ /* D6 .. D245 */
+ for (i = 48; i < 304; i += 16) {
+ memcpy(fr->d_bits + d_idx, trau_bits + i + 1, 15);
+ d_idx += 15;
+ }
+ /* D246 .. D256 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 305, 11);
+
+ return 0;
+}
+
+/* TS 08.60 Section 3.2 */
+static int encode16_oam(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ const ubit_t *cbits5;
+ int i, d_idx;
+
+ if (fr->dir == OSMO_TRAU_DIR_UL)
+ cbits5 = ft_oam_up_bits;
+ else
+ cbits5 = ft_oam_down_bits;
+
+ encode_sync16(trau_bits);
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5, 5);
+ /* C6 .. C15 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits, 15 - 5);
+
+ /* D1 .. D255 */
+ for (i = 32, d_idx = 0; i < 304; i += 16, d_idx += 15) {
+ trau_bits[i] = 1;
+ memcpy(trau_bits + i + 1, fr->d_bits + d_idx, 15);
+ }
+ /* D256 .. D264 */
+ memcpy(trau_bits + 305, fr->d_bits + 256, 9);
+
+ /* S1 .. S6 */
+ memcpy(trau_bits + 314, fr->s_bits, 6);
+
+ return 40 * 8;
+}
+
+/* TS 08.60 Section 3.2 */
+static int decode16_oam(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx;
+
+ /* C1 .. C15 */
+ memcpy(fr->c_bits + 0, trau_bits + 17, 15);
+
+ /* D1 .. D255 */
+ for (i = 33, d_idx = 0; i < 312; i+= 16, d_idx += 15)
+ memcpy(fr->d_bits + d_idx, trau_bits + i + 1, 15);
+ /* D256 .. D264 */
+ memcpy(fr->d_bits+d_idx, trau_bits + 305, 9);
+
+ /* S1 .. S6 */
+ memcpy(fr->s_bits, trau_bits + 314, 6);
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.1.1.1 */
+static int encode16_hr(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int d_idx = 0;
+ const ubit_t *cbits5;
+
+ if (fr->dir == OSMO_TRAU_DIR_UL)
+ cbits5 = ft_hr_up_bits;
+ else
+ cbits5 = ft_hr_down_bits;
+
+ encode_sync16(trau_bits);
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5, 5);
+ /* C6 .. C15 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 10);
+
+ /* UFI */
+ trau_bits[33] = fr->ufi;
+
+ /* D1 .. D14 */
+ memcpy(trau_bits + 4 * 8 + 2, fr->d_bits+d_idx, 14); d_idx += 14;
+ /* D15 .. D29 */
+ memcpy(trau_bits + 6 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15;
+ /* D30 .. D44 */
+ memcpy(trau_bits + 8 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15;
+ /* CRC */
+ memcpy(trau_bits + 10 * 8 + 1, fr->crc_bits, 3);
+ /* D45 .. D56 */
+ memcpy(trau_bits + 10 * 8 + 4, fr->d_bits+d_idx, 12); d_idx += 12;
+ /* D57 .. D71 */
+ memcpy(trau_bits + 12 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15;
+ /* D72 .. D86 */
+ memcpy(trau_bits + 14 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15;
+ /* D87 .. D101 */
+ memcpy(trau_bits + 16 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15;
+ /* D102 .. D112 */
+ memcpy(trau_bits + 18 * 8 + 1, fr->d_bits+d_idx, 11); d_idx += 11;
+
+ memset(trau_bits + 19 * 8 + 4, 0x01, 4 + 18 * 8 + 6);
+ /* C16 .. C21 */
+ memcpy(trau_bits + 38 * 8 + 6, fr->c_bits + 15, 6);
+
+ /* FIXME: handle timing adjustment */
+ /* T1 .. T4 */
+ memcpy(trau_bits + 39 * 8 + 4, fr->t_bits, 4);
+
+ return 40 * 8;
+}
+
+/* TS 08.61 Section 5.1.1.1 */
+static int decode16_hr(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int d_idx = 0;
+
+ /* C1 .. C15 */
+ memcpy(fr->c_bits + 0, trau_bits + 17, 15);
+ /* C16 .. C21 */
+ memcpy(fr->c_bits + 15, trau_bits + 38 * 8 + 6, 6);
+ /* T1 .. T4 */
+ memcpy(fr->t_bits + 0, trau_bits + 39 * 8 + 4, 4);
+
+ /* UFI */
+ fr->ufi = trau_bits[33];
+ /* D1 .. D14 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 4 * 8 + 2, 14); d_idx += 14;
+ /* D15 .. D29 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 6 * 8 + 1, 15); d_idx += 15;
+ /* D30 .. D44 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 8 * 8 + 1, 15); d_idx += 15;
+ /* CRC0..2 */
+ memcpy(fr->crc_bits, trau_bits + 10 * 8 + 1, 3);
+ /* D45 .. D56 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 10 * 8 + 4, 12); d_idx += 12;
+ /* D57 .. D71 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 12 * 8 + 1, 15); d_idx += 15;
+ /* D72 .. D86 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 14 * 8 + 1, 15); d_idx += 15;
+ /* D87 .. D101 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 16 * 8 + 1, 15); d_idx += 15;
+ /* D102 .. D112 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 18 * 8 + 1, 11); d_idx += 11;
+
+ return 0;
+}
+
+/* TS 08.60 Section 3.4 */
+static int encode16_idle(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ memcpy(trau_bits, trau_idle_frame(), 40*8);
+ return 40 * 8;
+}
+
+/* TS 08.60 Section 3.3.1 */
+static int decode16_data(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* C1 .. C15 */
+ memcpy(fr->c_bits + 0, trau_bits + 17, 15);
+
+ /* D1 .. D63 */
+ for (i = 0; i < 9; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + (4 + i) * 8 + 1, 7);
+ d_idx += 7;
+ }
+ /* D64 .. D126 */
+ for (i = 0; i < 9; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + (13 + i) * 8 + 1, 7);
+ d_idx += 7;
+ }
+
+ /* D127 .. D189 */
+ for (i = 0; i < 9; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + (22 + i) * 8 + 1, 7);
+ d_idx += 7;
+ }
+
+ /* D190 .. D252 */
+ for (i = 0; i < 9; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + (31 + i) * 8 + 1, 7);
+ d_idx += 7;
+ }
+
+ return 0;
+}
+
+/* TS 08.60 Section 3.3.1 */
+static int encode16_data(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ const ubit_t *cbits5;
+ int i, d_idx = 0;
+
+ if (fr->dir == OSMO_TRAU_DIR_UL)
+ cbits5 = ft_data_up_bits;
+ else
+ cbits5 = ft_data_down_bits;
+
+ encode_sync16(trau_bits);
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5, 5);
+ /* C6 .. C15 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5);
+
+ /* D1 .. D63 */
+ for (i = 0; i < 9; i++) {
+ unsigned int offset = (4 + i) * 8;
+ trau_bits[offset] = 1;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ /* D64 .. D126 */
+ for (i = 0; i < 9; i++) {
+ unsigned int offset = (13 + i) * 8;
+ trau_bits[offset] = 1;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ /* D127 .. D189 */
+ for (i = 0; i < 9; i++) {
+ unsigned int offset = (22 + i) * 8;
+ trau_bits[offset] = 1;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ /* D190 .. D252 */
+ for (i = 0; i < 9; i++) {
+ unsigned int offset = (31 + i) * 8;
+ trau_bits[offset] = 1;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ return 40 * 8;
+}
+
+/* TS 08.60 3.3.2 */
+static int decode16_edata(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ /* C1 .. C13 */
+ memcpy(fr->c_bits, trau_bits + 17, 13);
+
+ /* M1 .. M2 */
+ memcpy(fr->m_bits, trau_bits + 30, 2);
+
+ /* D1 .. D288 */
+ memcpy(fr->d_bits, trau_bits + 4 * 8, 288);
+
+ return 0;
+}
+
+/* TS 08.60 Section 3.3.2 */
+static int encode16_edata(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ const ubit_t *cbits5;
+
+ if (fr->type == OSMO_TRAU16_FT_D145_SYNC)
+ cbits5 = ft_d145s_bits;
+ else
+ cbits5 = ft_edata_bits;
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5, 5);
+
+ /* C6 .. C13 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 8);
+
+ /* M1 .. M2 */
+ memcpy(trau_bits + 30, fr->m_bits, 2);
+
+ /* D1 .. D288 */
+ memcpy(trau_bits + 4 * 8, fr->d_bits, 288);
+
+ return 40 * 8;
+}
+
+/* TS 08.61 Section 5.1.2 */
+static int decode16_data_hr(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* C1 .. C15 */
+ memcpy(fr->c_bits+0, trau_bits + 17, 15);
+
+ /* D1 .. D63 */
+ for (i = 0; i < 9; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + (4 + i) * 8 + 1, 7);
+ d_idx += 7;
+ }
+
+ /* D'1 .. D'63 (mapped to D64..D127) */
+ for (i = 0; i < 9; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + (22 + i) * 8 + 1, 7);
+ d_idx += 7;
+ }
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.1.2 */
+static int encode16_data_hr(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ const ubit_t *cbits5;
+ int i, d_idx = 0;
+
+ if (fr->dir == OSMO_TRAU_DIR_UL)
+ cbits5 = ft_data_hr_up_bits;
+ else
+ cbits5 = ft_data_hr_down_bits;
+
+ encode_sync16(trau_bits);
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 17, cbits5, 5);
+ /* C6 .. C15 */
+ memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5);
+
+ /* D1 .. D63 */
+ for (i = 4; i < 4 + 9; i++) {
+ unsigned int offset = i * 8;
+ trau_bits[offset] = 1;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ memset(trau_bits + 13*8, 1, 9*8);
+
+ /* D'1 .. D'63 (mapped to D64..D127) */
+ for (i = 22; i < 22 + 9; i++) {
+ unsigned int offset = i * 8;
+ trau_bits[offset] = 1;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ memset(trau_bits + 31*8, 1, 9*8);
+
+ return 40 * 8;
+}
+
+/* TS 08.61 Section 5.2.1.1 */
+static int decode8_hr(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* C1 .. C5 */
+ memcpy(fr->c_bits, trau_bits + 9, 5);
+ /* XC1 .. XC2 */
+ memcpy(fr->xc_bits, trau_bits + 8 + 6, 2);
+ /* XC3 .. XC6 */
+ memcpy(fr->xc_bits + 2, trau_bits + 2 * 8 + 2, 4);
+ /* D1 .. D2 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 6, 2);
+ d_idx += 2;
+
+ /* D1 .. D44 */
+ for (i = 3; i < 3 + 6; i++) {
+ int offset = i * 8;
+ memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 7);
+ d_idx += 7;
+ }
+
+ /* CRC0 .. CRC2 */
+ fr->crc_bits[2] = trau_bits[82];
+ fr->crc_bits[1] = trau_bits[83];
+ fr->crc_bits[0] = trau_bits[84];
+
+ /* D45 .. D48 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 85, 4);
+
+ /* D49 .. D111 */
+ for (i = 10; i < 10 + 10; i++) {
+ int offset = i * 8;
+ memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 7);
+ d_idx += 7;
+ }
+ /* D112 */
+ fr->d_bits[d_idx++] = trau_bits[19 * 8 + 1];
+
+ /* C6 .. C9 */
+ memcpy(fr->c_bits + 5, trau_bits + 19 * 8 + 2, 4);
+
+ /* FIXME: handle timing adjustment */
+ /* T1 .. T2 */
+ fr->t_bits[0] = trau_bits[19 * 8 + 6];
+ fr->t_bits[1] = trau_bits[19 * 8 + 7];
+
+ return 0;
+}
+
+/* compute the odd parity bit of the given input bit sequence */
+static ubit_t compute_odd_parity(const ubit_t *in, unsigned int num_bits)
+{
+ int i;
+ unsigned int sum = 0;
+
+ for (i = 0; i < num_bits; i++) {
+ if (in[i])
+ sum++;
+ }
+
+ if (sum % 1)
+ return 0;
+ else
+ return 1;
+}
+
+/* TS 08.61 Section 5.2.1.1 */
+static int encode8_hr(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int i, d_idx = 0;
+
+ /* sync pattern */
+ memset(trau_bits, 0, 8);
+ trau_bits[8] = 1;
+ trau_bits[16] = 0;
+ trau_bits[17] = 1;
+ for (i = 3; i < 20; i++)
+ trau_bits[i * 8] = 1;
+
+ /* C1 .. C5 */
+ ubit_t *cbits_out = trau_bits + 1 * 8 + 1;
+ if (fr->dir == OSMO_TRAU_DIR_UL) {
+ cbits_out[0] = 0;
+ cbits_out[1] = 0;
+ cbits_out[2] = 0;
+ cbits_out[3] = 1;
+ cbits_out[4] = 1;
+ } else {
+ cbits_out[0] = 0;
+ cbits_out[1] = 0;
+ cbits_out[2] = 0;
+ cbits_out[3] = fr->c_bits[3];
+ cbits_out[4] = compute_odd_parity(cbits_out, 4);
+ }
+
+ /* XC1 .. XC2 */
+ memcpy(trau_bits + 1 * 8 + 6, fr->xc_bits, 2);
+ /* XC3 .. XC6 */
+ memcpy(trau_bits + 2 * 8 + 2, fr->xc_bits, 4);
+ /* D1 .. D2 */
+ memcpy(trau_bits + 2 * 8 + 6, fr->d_bits, 2);
+ d_idx += 2;
+
+ /* D1 .. D44 */
+ for (i = 3; i < 3 + 6; i++) {
+ int offset = i * 8;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ };
+
+ /* CRC0 .. CRC2 */
+ trau_bits[82] = fr->crc_bits[2];
+ trau_bits[83] = fr->crc_bits[1];
+ trau_bits[84] = fr->crc_bits[0];
+
+ /* D49 .. D111 */
+ for (i = 10; i < 10 + 10; i++) {
+ int offset = i * 8;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+ /* D112 */
+ trau_bits[19 * 8 + 1] = fr->d_bits[d_idx++];
+
+ /* C6 .. C9 */
+ memcpy(trau_bits + 19 * 8 + 2, fr->c_bits + 5, 4);
+
+ /* FIXME: handle timing adjustment */
+ /* T1 .. T2 */
+ trau_bits[19 * 8 + 6] = fr->t_bits[0];
+ trau_bits[19 * 8 + 7] = fr->t_bits[1];
+
+ return 20 * 8;
+}
+
+/* TS 08.61 Section 5.2.1.2.1 */
+static int decode8_amr_low(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* D1 .. D7 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 1, 7);
+ d_idx += 7;
+ /* C1 .. C5 */
+ memcpy(fr->c_bits, trau_bits + 2 * 8 + 1, 5);
+ /* D8 .. D9 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 6, 2);
+ d_idx += 2;
+ /* D10 .. D15 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 3 * 8 + 2, 6);
+ d_idx += 6;
+ /* D16 .. D120 */
+ for (i = 4; i < 19; i++) {
+ int offset = i * 8;
+ memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 7);
+ d_idx += 7;
+ }
+ /* D121 .. D126 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 19 * 8 + 1, 6);
+ d_idx += 6;
+
+ /* FIXME: handle timing adjustment */
+ /* T1 */
+ fr->t_bits[0] = trau_bits[19 * 8 + 7];
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.2.1.2.1 */
+static int encode8_amr_low(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int i, d_idx = 0;
+
+ /* sync pattern */
+ memset(trau_bits, 0, 8);
+ trau_bits[8] = 1;
+ trau_bits[16] = 1;
+ trau_bits[24] = 0;
+ trau_bits[25] = 1;
+ for (i = 4; i < 20; i++)
+ trau_bits[i * 8] = 1;
+
+ /* D1 .. D7 */
+ memcpy(trau_bits + 1 * 8 + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ /* C1 .. C5 */
+ memcpy(trau_bits + 2 * 8 + 1, fr->c_bits, 5);
+ /* D8 .. D9 */
+ memcpy(trau_bits + 2 * 8 + 6, fr->d_bits + d_idx, 2);
+ d_idx += 2;
+ /* D10 .. D15 */
+ memcpy(trau_bits + 3 * 8 + 2, fr->d_bits + d_idx, 6);
+ d_idx += 6;
+ /* D16 .. D120 */
+ for (i = 4; i < 19; i++) {
+ int offset = i * 8;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+ /* D121 .. D126 */
+ memcpy(trau_bits + 19 * 8 + 1, fr->d_bits + d_idx, 6);
+ d_idx += 6;
+
+ /* T1 */
+ trau_bits[19 * 8 + 7] = fr->t_bits[0];
+
+ return 20 * 8;
+}
+
+/* TS 08.61 Section 5.2.1.2.2 */
+static int decode8_amr_67(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* D1 .. D7 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 1, 7);
+ d_idx += 7;
+ /* C1 .. C3 */
+ memcpy(fr->c_bits, trau_bits + 2 * 8 + 1, 3);
+ /* D8 .. D11 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 4, 4);
+ d_idx += 4;
+ /* D12 .. D39 */
+ for (i = 3; i < 7; i++) {
+ int offset = i * 8;
+ memcpy(fr->d_bits + d_idx, trau_bits + offset + 2, 7);
+ d_idx += 7;
+ }
+
+ /* D40 .. D137 */
+ for (i = 7; i < 20; i+= 2) {
+ int offset = i * 8;
+ memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 15);
+ d_idx += 15;
+ }
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.1.2.2 */
+static int encode8_amr_67(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int i, d_idx = 0;
+
+ /* sync pattern */
+ memset(trau_bits, 0, 8);
+ trau_bits[1 * 8] = 1;
+ trau_bits[2 * 8] = 1;
+ trau_bits[3 * 8] = 1;
+ trau_bits[4 * 8] = 1;
+ trau_bits[5 * 8] = 0;
+ for (i = 5; i < 20; i += 2)
+ trau_bits[i * 8] = 1;
+
+ /* D1 .. D7 */
+ memcpy(trau_bits + 1 * 8 + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ /* C1 .. C3 */
+ memcpy(trau_bits + 2 * 8 + 1, fr->c_bits, 3);
+ /* D8 .. D11 */
+ memcpy(trau_bits + 2 * 8 + 4, fr->d_bits + d_idx, 4);
+ d_idx += 4;
+ /* D12 .. D39 */
+ for (i = 3; i < 7; i++) {
+ int offset = i * 8;
+ memcpy(trau_bits + offset + 2, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+
+ /* D40 .. D137 */
+ for (i = 7; i < 20; i+= 2) {
+ int offset = i * 8;
+ memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 15);
+ d_idx += 15;
+ }
+
+ return 20 * 8;
+}
+
+/* TS 08.61 Section 5.1.2.3 */
+static int decode8_amr_74(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int d_idx = 0;
+
+ /* D1 .. D5 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 3, 5);
+ d_idx += 5;
+ /* D6 .. D12 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 1, 7);
+ d_idx += 7;
+ /* C1.. C3 */
+ memcpy(fr->c_bits, trau_bits + 2 * 8 + 1, 3);
+ /* D13 .. D16 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 4, 4);
+ d_idx += 4;
+ /* D17 .. D23 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 3 * 8 + 1, 7);
+ d_idx += 7;
+ /* D24 .. D151 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 4 * 8, 16 * 8);
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.1.2.3 */
+static int encode8_amr_74(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int d_idx = 0;
+
+ /* sync pattern */
+ trau_bits[0] = 0;
+ trau_bits[1] = 0;
+ trau_bits[2] = 1;
+ trau_bits[1*8] = 0;
+ trau_bits[2*8] = 1;
+ trau_bits[3*8] = 0;
+
+ /* D1 .. D5 */
+ memcpy(trau_bits + 3, fr->d_bits + d_idx, 5);
+ d_idx += 5;
+ /* D6 .. D12 */
+ memcpy(trau_bits + 1 * 8 + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ /* C1.. C3 */
+ memcpy(trau_bits + 2 * 8 + 1, fr->c_bits, 3);
+ /* D13 .. D16 */
+ memcpy(trau_bits + 2 * 8 + 4, fr->d_bits + d_idx, 4);
+ d_idx += 4;
+ /* D17 .. D23 */
+ memcpy(trau_bits + 3 * 8 + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ /* D24 .. D151 */
+ memcpy(trau_bits + 4 * 8, fr->d_bits + d_idx, 16 * 8);
+
+ return 20 * 8;
+}
+
+/* TS 08.61 Section 5.2.2 */
+static int decode8_data(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* C1 .. C5 */
+ memcpy(fr->c_bits, trau_bits + 1 * 8 + 1, 5);
+ /* D1 .. D2 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 6, 2);
+ d_idx += 2;
+ /* D3 .. D8 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 2, 6);
+ /* D9 .. D57 + D'1 .. D'57 */
+ for (i = 3; i < 20; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + i * 8 + 1, 7);
+ d_idx += 7;
+ }
+ /* D'58 .. D'62 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 19 * 8 + 1, 6);
+ d_idx += 6;
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.2.2 */
+static int encode8_data(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int i, d_idx = 0;
+
+ /* sync pattern */
+ memset(trau_bits, 0, 8);
+ trau_bits[1 * 8] = 1;
+ trau_bits[2 * 8] = 0;
+ trau_bits[2 * 8 + 1] = 1;
+ for (i = 3; i < 19; i++)
+ trau_bits[i * 8] = 1;
+ trau_bits[19 * 8 + 7] = 1;
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 1 * 8 + 1, fr->c_bits, 5);
+ /* D1 .. D2 */
+ memcpy(trau_bits + 1 * 8 + 6, fr->d_bits + d_idx, 2);
+ d_idx += 2;
+ /* D3 .. D8 */
+ memcpy(trau_bits + 2 * 8 + 2, fr->d_bits + d_idx, 6);
+ /* D9 .. D57 + D'1 .. D'57 */
+ for (i = 3; i < 20; i++) {
+ memcpy(trau_bits + i * 8 + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+ /* D'58 .. D'62 */
+ memcpy(trau_bits + 19 * 8 + 1, fr->d_bits + d_idx, 6);
+ d_idx += 6;
+
+ return 20 * 8;
+}
+
+/* TS 08.61 Section 5.2.3 */
+static int decode8_oam(struct osmo_trau_frame *fr, const ubit_t *trau_bits,
+ enum osmo_trau_frame_direction dir)
+{
+ int i, d_idx = 0;
+
+ /* C1 .. C5 */
+ memcpy(fr->c_bits, trau_bits + 1 * 8 + 1, 5);
+ /* XC1 .. XC2 */
+ memcpy(fr->xc_bits, trau_bits + 1 * 8 + 6, 2);
+ /* XC3 .. XC6 */
+ memcpy(fr->xc_bits + 2, trau_bits + 2 * 8 + 2, 4);
+ /* D1 .. D2 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 6, 2);
+ d_idx += 2;
+ /* D3 .. D114 */
+ for (i = 3; i < 19; i++) {
+ memcpy(fr->d_bits + d_idx, trau_bits + i * 8 + 1, 7);
+ d_idx += 7;
+ }
+ /* D115 .. D120 */
+ memcpy(fr->d_bits + d_idx, trau_bits + 19 * 8 + 1, 6);
+ d_idx += 7;
+
+ return 0;
+}
+
+/* TS 08.61 Section 5.2.3 */
+static int encode8_oam(ubit_t *trau_bits, const struct osmo_trau_frame *fr)
+{
+ int i, d_idx = 0;
+
+ /* sync pattern */
+ memset(trau_bits, 0, 8);
+ trau_bits[1 * 8 + 0] = 1;
+ trau_bits[2 * 8 + 0] = 0;
+ trau_bits[2 * 8 + 1] = 1;
+ for (i = 3; i < 20; i++)
+ trau_bits[i * 8] = 1;
+
+ /* C1 .. C5 */
+ memcpy(trau_bits + 1 * 8 + 1, fr->c_bits, 5);
+ /* XC1 .. XC2 */
+ memcpy(trau_bits + 1 * 8 + 6, fr->xc_bits, 2);
+ /* XC3 .. XC6 */
+ memcpy(trau_bits + 2 * 8 + 2, fr->xc_bits + 2, 4);
+ /* D1 .. D2 */
+ memcpy(trau_bits + 2 * 8 + 6, fr->d_bits + d_idx, 2);
+ d_idx += 2;
+ /* D3 .. D114 */
+ for (i = 3; i < 19; i++) {
+ memcpy(trau_bits + i * 8 + 1, fr->d_bits + d_idx, 7);
+ d_idx += 7;
+ }
+ /* D115 .. D120 */
+ memcpy(trau_bits + 19 * 8 + 1, fr->d_bits + d_idx, 6);
+ d_idx += 7;
+
+ return 20 * 8;
+}
+
+
+/*! Encode a TRAU frame from its decoded representation to a sequence of unpacked bits.
+ * \param[out] bits caller-allocated buffer for unpacked outpud bits
+ * \param[in] n_bits size of 'bits' oputput buffer in number of unpacked bits
+ * \param[in] fr decoded representation of TRAU frame to be encoded
+ * \return 0 number of unpacked output bits generated; negative in case of error */
+int osmo_trau_frame_encode(ubit_t *bits, size_t n_bits, const struct osmo_trau_frame *fr)
+{
+ switch (fr->type) {
+ case OSMO_TRAU16_FT_FR:
+ case OSMO_TRAU16_FT_EFR:
+ return encode16_fr(bits, fr);
+ case OSMO_TRAU16_FT_HR:
+ return encode16_hr(bits, fr);
+ case OSMO_TRAU16_FT_AMR:
+ return encode16_amr(bits, fr);
+ case OSMO_TRAU16_FT_OAM:
+ return encode16_oam(bits, fr);
+ case OSMO_TRAU16_FT_IDLE:
+ return encode16_idle(bits, fr);
+ case OSMO_TRAU16_FT_DATA_HR:
+ return encode16_data_hr(bits, fr);
+ case OSMO_TRAU16_FT_DATA:
+ return encode16_data(bits, fr);
+ case OSMO_TRAU16_FT_D145_SYNC:
+ case OSMO_TRAU16_FT_EDATA:
+ return encode16_edata(bits, fr);
+ case OSMO_TRAU8_SPEECH:
+ return encode8_hr(bits, fr);
+ case OSMO_TRAU8_DATA:
+ return encode8_data(bits, fr);
+ case OSMO_TRAU8_OAM:
+ return encode8_oam(bits, fr);
+ case OSMO_TRAU8_AMR_LOW:
+ return encode8_amr_low(bits, fr);
+ case OSMO_TRAU8_AMR_6k7:
+ return encode8_amr_67(bits, fr);
+ case OSMO_TRAU8_AMR_7k4:
+ return encode8_amr_74(bits, fr);
+ case OSMO_TRAU16_FT_NONE:
+ default:
+ return -EINVAL;
+ }
+}
+
+/*! Decode/parse a 16k TRAU frame from unpacked bits to decoded format.
+ * \param[out] fr caller-allocated output data structure
+ * \param[in] bits unpacked bits containing raw TRAU frame; must be aligned
+ * \param[in] dir direction (uplink/downlink)
+ * \returns 0 in case of success; negative on error */
+int osmo_trau_frame_decode_16k(struct osmo_trau_frame *fr, const ubit_t *bits,
+ enum osmo_trau_frame_direction dir)
+{
+ uint8_t cbits5 = get_bits(bits, 17, 5);
+
+ fr->type = OSMO_TRAU16_FT_NONE;
+ fr->dir = dir;
+
+ switch (cbits5) {
+ case TRAU_FT_FR_UP:
+ case TRAU_FT_FR_DOWN:
+ fr->type = OSMO_TRAU16_FT_FR;
+ return decode16_fr(fr, bits, dir);
+ case TRAU_FT_IDLE_UP:
+ case TRAU_FT_IDLE_DOWN:
+ fr->type = OSMO_TRAU16_FT_IDLE;
+ return decode16_fr(fr, bits, dir);
+ case TRAU_FT_EFR:
+ fr->type = OSMO_TRAU16_FT_EFR;
+ return decode16_fr(fr, bits, dir);
+ case TRAU_FT_AMR:
+ fr->type = OSMO_TRAU16_FT_AMR;
+ return decode16_amr(fr, bits, dir);
+ case TRAU_FT_OM_UP:
+ case TRAU_FT_OM_DOWN:
+ fr->type = OSMO_TRAU16_FT_OAM;
+ return decode16_oam(fr, bits, dir);
+ case TRAU_FT_DATA_UP:
+ case TRAU_FT_DATA_DOWN:
+ fr->type = OSMO_TRAU16_FT_DATA;
+ return decode16_data(fr, bits, dir);
+ case TRAU_FT_HR_UP:
+ case TRAU_FT_HR_DOWN:
+ fr->type = OSMO_TRAU16_FT_HR;
+ return decode16_hr(fr, bits, dir);
+ case TRAU_FT_DATA_UP_HR:
+ case TRAU_FT_DATA_DOWN_HR:
+ fr->type = OSMO_TRAU16_FT_DATA_HR;
+ return decode16_data_hr(fr, bits, dir);
+ case TRAU_FT_EDATA:
+ fr->type = OSMO_TRAU16_FT_EDATA;
+ return decode16_edata(fr, bits, dir);
+ case TRAU_FT_D145_SYNC:
+ fr->type = OSMO_TRAU16_FT_D145_SYNC;
+ return decode16_edata(fr, bits, dir);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+#define TRAU8_FT_AMR_NO_SPEECH_CMI 0x10 /* 1, 0, 0, 0, 0 */
+#define TRAU8_FT_AMR_NO_SPEECH_CMR 0x14 /* 1, 0, 1, 0, 0 */
+#define TRAU8_FT_AMR_475_515_590 0..7
+
+const uint8_t bit8_0[16] = { 0, };
+
+/*!< check sync pattern for hr/data/oam */
+static bool is_hr(const ubit_t *bits)
+{
+ int i;
+
+ /* TS 08.61 Section 6.8.2.1.1 */
+ if (memcmp(bits, bit8_0, sizeof(bit8_0)))
+ return false;
+ if (bits[8] != 1)
+ return false;
+ if (bits[16] != 0 || bits[17] != 1)
+ return false;
+ for (i = 24; i < 20 * 8; i += 16) {
+ if (bits[i] != 1)
+ return false;
+ }
+ return true;
+}
+
+
+/*!< check sync pattern for AMR No_Speech + low bit rate */
+static bool is_amr_low(const ubit_t *bits)
+{
+ int i;
+
+ /* TS 08.61 Section 6.8.2.1.2 */
+ if (memcmp(bits, bit8_0, sizeof(bit8_0)))
+ return false;
+ if (bits[8] != 1)
+ return false;
+ if (bits[16] != 1)
+ return false;
+ if (bits[24] != 0 || bits[25] != 1)
+ return false;
+ for (i = 32; i < 20 * 8; i += 16) {
+ if (bits[i] != 1)
+ return false;
+ }
+ return true;
+}
+
+/*!< check sync pattern for AMR 6.7kBit/s */
+static bool is_amr_67(const ubit_t *bits)
+{
+ int i;
+
+ /* TS 08.61 Section 6.8.2.1.3 */
+ if (memcmp(bits, bit8_0, sizeof(bit8_0)))
+ return false;
+ if (bits[8] != 1)
+ return false;
+ if (bits[16] != 1)
+ return false;
+ if (bits[24] != 1)
+ return false;
+ if (bits[32] != 1)
+ return false;
+ if (bits[40] != 0)
+ return false;
+ for (i = 48; i < 20 * 8; i+= 16)
+ if (bits[i] != 1)
+ return false;
+
+ return true;
+}
+
+/*!< check sync pattern for AMR 7.4kBit/s */
+static bool is_amr_74(const ubit_t *bits)
+{
+ if (bits[0] != 0 || bits[1] != 0 || bits[2] != 0)
+ return false;
+ if (bits[8] != 0)
+ return false;
+ if (bits[16] != 1)
+ return false;
+ if (bits[24] != 0)
+ return false;
+
+ return true;
+}
+
+/*! Decode/parse a 8k TRAU frame from unpacked bits to decoded format.
+ * \param[out] fr caller-allocated output data structure
+ * \param[in] bits unpacked bits containing raw TRAU frame; must be aligned
+ * \param[in] dir direction (uplink/downlink)
+ * \returns 0 in case of success; negative on error */
+int osmo_trau_frame_decode_8k(struct osmo_trau_frame *fr, const ubit_t *bits,
+ enum osmo_trau_frame_direction dir)
+{
+ fr->dir = dir;
+
+ if (is_hr(bits)) {
+ /* normal sync pattern */
+ uint8_t cbits5 = get_bits(bits, 9, 5);
+ if (dir == OSMO_TRAU_DIR_UL) {
+ switch (cbits5) { /* Section 5.2.4.1.1 */
+ case 0x02:
+ return decode8_hr(fr, bits, dir);
+ case 0x07:
+ return decode8_data(fr, bits, dir);
+ case 0x13:
+ return decode8_oam(fr, bits, dir);
+ }
+ } else {
+ /* Downlink */
+ switch (cbits5 >> 2) { /* Section 5.2.4.1.2 */
+ case 0:
+ return decode8_hr(fr, bits, dir);
+ case 1:
+ return decode8_data(fr, bits, dir);
+ case 2:
+ return decode8_oam(fr, bits, dir);
+ }
+ }
+ } else if (is_amr_low(bits)) {
+ return decode8_amr_low(fr, bits, dir);
+ } else if (is_amr_67(bits)) {
+ return decode8_amr_67(fr, bits, dir);
+ } else if (is_amr_74(bits)) {
+ return decode8_amr_74(fr, bits, dir);
+ }
+
+ return -EINVAL;
+}
+
/* }@ */
--
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Gerrit-Project: libosmo-abis
Gerrit-Branch: master
Gerrit-Change-Id: I5cf42e6c445d9224be18503cebc7584b3beba08c
Gerrit-Change-Number: 18249
Gerrit-PatchSet: 1
Gerrit-Owner: laforge <laforge at osmocom.org>
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