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-rw-r--r--src/coding/gsm0503_amr_dtx.c185
1 files changed, 112 insertions, 73 deletions
diff --git a/src/coding/gsm0503_amr_dtx.c b/src/coding/gsm0503_amr_dtx.c
index b1493300..7de3b281 100644
--- a/src/coding/gsm0503_amr_dtx.c
+++ b/src/coding/gsm0503_amr_dtx.c
@@ -1,5 +1,5 @@
/*
- * (C) 2020 by sysmocom - s.f.m.c. GmbH, Author: Philipp Maier
+ * (C) 2020-2022 by sysmocom - s.f.m.c. GmbH, Author: Philipp Maier
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
@@ -32,6 +32,8 @@
#include <osmocom/coding/gsm0503_parity.h>
#include <osmocom/gsm/gsm0503.h>
+#define S2U(b) ((b) < 0)
+
/* See also: 3GPP TS 05.03, chapter 3.10.1.3, 3.10.5.2 Identification marker */
static const ubit_t id_marker_1[] = { 1, 0, 1, 1, 0, 0, 0, 0, 1 };
@@ -60,7 +62,7 @@ const struct value_string gsm0503_amr_dtx_frame_names[] = {
{ 0, NULL }
};
-static bool detect_afs_id_marker(int *n_errors, int *n_bits_total, const ubit_t * ubits, uint8_t offset, uint8_t count,
+static bool detect_afs_id_marker(int *n_errors, int *n_bits_total, const sbit_t *sbits, uint8_t offset, uint8_t count,
const ubit_t * id_marker, uint8_t id_marker_len)
{
unsigned int i, k;
@@ -69,20 +71,20 @@ static bool detect_afs_id_marker(int *n_errors, int *n_bits_total, const ubit_t
int bits = 0;
/* Override coded in-band data */
- ubits += offset;
+ sbits += offset;
/* Check for identification marker bits */
for (i = 0; i < count; i++) {
for (k = 0; k < 4; k++) {
- if (id_marker[id_bit_nr % id_marker_len] != *ubits)
+ if (*sbits == 0 || id_marker[id_bit_nr % id_marker_len] != S2U(*sbits))
errors++;
id_bit_nr++;
- ubits++;
+ sbits++;
bits++;
}
/* Jump to the next block of 4 bits */
- ubits += 4;
+ sbits += 4;
}
*n_errors = errors;
@@ -92,30 +94,30 @@ static bool detect_afs_id_marker(int *n_errors, int *n_bits_total, const ubit_t
return *n_errors < *n_bits_total / 8;
}
-static bool detect_ahs_id_marker(int *n_errors, int *n_bits_total, const ubit_t * ubits, const ubit_t * id_marker)
+static bool detect_ahs_id_marker(int *n_errors, int *n_bits_total, const sbit_t *sbits, const ubit_t *id_marker)
{
unsigned int i, k;
int errors = 0;
int bits = 0;
/* Override coded in-band data */
- ubits += 16;
+ sbits += 16;
/* Check first identification marker bits (23*9 bits) */
for (i = 0; i < 23; i++) {
for (k = 0; k < 9; k++) {
- if (id_marker[k] != *ubits)
+ if (*sbits == 0 || id_marker[k] != S2U(*sbits))
errors++;
- ubits++;
+ sbits++;
bits++;
}
}
/* Check remaining identification marker bits (5 bits) */
for (k = 0; k < 5; k++) {
- if (id_marker[k] != *ubits)
+ if (*sbits == 0 || id_marker[k] != S2U(*sbits))
errors++;
- ubits++;
+ sbits++;
bits++;
}
@@ -126,7 +128,7 @@ static bool detect_ahs_id_marker(int *n_errors, int *n_bits_total, const ubit_t
return *n_errors < *n_bits_total / 8;
}
-static bool detect_interleaved_ahs_id_marker(int *n_errors, int *n_bits_total, const ubit_t * ubits, uint8_t offset,
+static bool detect_interleaved_ahs_id_marker(int *n_errors, int *n_bits_total, const sbit_t *sbits, uint8_t offset,
uint8_t n_bits, const ubit_t * id_marker, uint8_t id_marker_len)
{
unsigned int i, k;
@@ -136,23 +138,23 @@ static bool detect_interleaved_ahs_id_marker(int *n_errors, int *n_bits_total, c
uint8_t remainder = n_bits % id_marker_len;
/* Override coded in-band data */
- ubits += offset;
+ sbits += offset;
/* Check first identification marker bits (23*9 bits) */
for (i = 0; i < full_rounds; i++) {
for (k = 0; k < id_marker_len; k++) {
- if (id_marker[k] != *ubits)
+ if (*sbits == 0 || id_marker[k] != S2U(*sbits))
errors++;
- ubits += 2;
+ sbits += 2;
bits++;
}
}
/* Check remaining identification marker bits (5 bits) */
for (k = 0; k < remainder; k++) {
- if (id_marker[k] != *ubits)
+ if (*sbits == 0 || id_marker[k] != S2U(*sbits))
errors++;
- ubits += 2;
+ sbits += 2;
bits++;
}
@@ -164,125 +166,127 @@ static bool detect_interleaved_ahs_id_marker(int *n_errors, int *n_bits_total, c
}
/* Detect an FR AMR SID_FIRST frame by its identifcation marker */
-static bool detect_afs_sid_first(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static bool detect_afs_sid_first(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
- return detect_afs_id_marker(n_errors, n_bits_total, ubits, 32, 53, id_marker_0, 9);
+ return detect_afs_id_marker(n_errors, n_bits_total, sbits, 32, 53, id_marker_0, 9);
}
/* Detect an FR AMR SID_UPDATE frame by its identification marker */
-static bool detect_afs_sid_update(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static bool detect_afs_sid_update(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
- return detect_afs_id_marker(n_errors, n_bits_total, ubits, 36, 53, id_marker_0, 9);
+ return detect_afs_id_marker(n_errors, n_bits_total, sbits, 36, 53, id_marker_0, 9);
}
/* Detect an FR AMR ONSET frame by its repeating coded inband data */
-static bool detect_afs_onset(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static int detect_afs_onset(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
bool rc;
- rc = detect_afs_id_marker(n_errors, n_bits_total, ubits, 4, 57, codec_mode_1_sid, 16);
+ rc = detect_afs_id_marker(n_errors, n_bits_total, sbits, 4, 57, codec_mode_1_sid, 16);
if (rc)
- return true;
+ return 0;
- rc = detect_afs_id_marker(n_errors, n_bits_total, ubits, 4, 57, codec_mode_2_sid, 16);
+ rc = detect_afs_id_marker(n_errors, n_bits_total, sbits, 4, 57, codec_mode_2_sid, 16);
if (rc)
- return true;
+ return 1;
- rc = detect_afs_id_marker(n_errors, n_bits_total, ubits, 4, 57, codec_mode_3_sid, 16);
+ rc = detect_afs_id_marker(n_errors, n_bits_total, sbits, 4, 57, codec_mode_3_sid, 16);
if (rc)
- return true;
+ return 2;
- rc = detect_afs_id_marker(n_errors, n_bits_total, ubits, 4, 57, codec_mode_4_sid, 16);
+ rc = detect_afs_id_marker(n_errors, n_bits_total, sbits, 4, 57, codec_mode_4_sid, 16);
if (rc)
- return true;
+ return 3;
- return false;
+ return -1;
}
/* Detect an HR AMR SID UPDATE frame by its identification marker */
-static bool detect_ahs_sid_update(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static bool detect_ahs_sid_update(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
- return detect_ahs_id_marker(n_errors, n_bits_total, ubits, id_marker_1);
+ return detect_ahs_id_marker(n_errors, n_bits_total, sbits, id_marker_1);
}
/* Detect an HR AMR SID FIRST (part 1) frame by its identification marker */
-static bool detect_ahs_sid_first_p1(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static bool detect_ahs_sid_first_p1(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
- return detect_ahs_id_marker(n_errors, n_bits_total, ubits, id_marker_0);
+ return detect_ahs_id_marker(n_errors, n_bits_total, sbits, id_marker_0);
}
/* Detect an HR AMR SID FIRST (part 2) frame by its repeating coded inband data */
-static bool detect_ahs_sid_first_p2(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static int detect_ahs_sid_first_p2(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
bool rc;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 0, 114, codec_mode_1_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 0, 114, codec_mode_1_sid, 16);
if (rc)
- return true;
+ return 0;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 0, 114, codec_mode_2_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 0, 114, codec_mode_2_sid, 16);
if (rc)
- return true;
+ return 1;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 0, 114, codec_mode_3_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 0, 114, codec_mode_3_sid, 16);
if (rc)
- return true;
+ return 2;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 0, 114, codec_mode_4_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 0, 114, codec_mode_4_sid, 16);
if (rc)
- return true;
+ return 3;
- return false;
+ return -1;
}
/* Detect an HR AMR ONSET frame by its repeating coded inband data */
-static bool detect_ahs_onset(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static int detect_ahs_onset(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
bool rc;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 1, 114, codec_mode_1_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 1, 114, codec_mode_1_sid, 16);
if (rc)
- return true;
+ return 0;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 1, 114, codec_mode_2_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 1, 114, codec_mode_2_sid, 16);
if (rc)
- return true;
+ return 1;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 1, 114, codec_mode_3_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 1, 114, codec_mode_3_sid, 16);
if (rc)
- return true;
+ return 2;
- rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 1, 114, codec_mode_4_sid, 16);
+ rc = detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 1, 114, codec_mode_4_sid, 16);
if (rc)
- return true;
+ return 3;
- return false;
+ return -1;
}
/* Detect an HR AMR SID FIRST INHIBIT frame by its identification marker */
-static bool detect_ahs_sid_first_inh(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static bool detect_ahs_sid_first_inh(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
- return detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 33, 212, id_marker_1, 9);
+ return detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 33, 212, id_marker_1, 9);
}
/* Detect an HR AMR SID UPDATE INHIBIT frame by its identification marker */
-static bool detect_ahs_sid_update_inh(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+static bool detect_ahs_sid_update_inh(int *n_errors, int *n_bits_total, const sbit_t *sbits)
{
- return detect_interleaved_ahs_id_marker(n_errors, n_bits_total, ubits, 33, 212, id_marker_0, 9);
+ return detect_interleaved_ahs_id_marker(n_errors, n_bits_total, sbits, 33, 212, id_marker_0, 9);
}
/*! Detect FR AMR DTX frame in unmapped, deinterleaved frame bits.
- * \param[in] ubits input bits (456 bit).
* \param[out] n_errors number of errornous bits.
* \param[out] n_bits_total number of checked bits.
+ * \param[out] mode_id codec mode ID (0..3 or -1).
+ * \param[in] sbits input soft-bits (456 bit).
* \returns dtx frame type. */
-enum gsm0503_amr_dtx_frames gsm0503_detect_afs_dtx_frame(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+enum gsm0503_amr_dtx_frames gsm0503_detect_afs_dtx_frame2(int *n_errors, int *n_bits_total,
+ int *mode_id, const sbit_t *sbits)
{
- if (detect_afs_sid_first(n_errors, n_bits_total, ubits))
+ if (detect_afs_sid_first(n_errors, n_bits_total, sbits))
return AFS_SID_FIRST;
- if (detect_afs_sid_update(n_errors, n_bits_total, ubits))
+ if (detect_afs_sid_update(n_errors, n_bits_total, sbits))
return AFS_SID_UPDATE;
- if (detect_afs_onset(n_errors, n_bits_total, ubits))
+ if ((*mode_id = detect_afs_onset(n_errors, n_bits_total, sbits)) != -1)
return AFS_ONSET;
*n_errors = 0;
@@ -290,27 +294,62 @@ enum gsm0503_amr_dtx_frames gsm0503_detect_afs_dtx_frame(int *n_errors, int *n_b
return AMR_OTHER;
}
-/*! Detect HR AMR DTX frame in unmapped, deinterleaved frame bits.
+/*! Detect FR AMR DTX frame in unmapped, deinterleaved frame bits.
+ * DEPRECATED: use gsm0503_detect_afs_dtx_frame2() instead.
+ * \param[out] n_errors number of errornous bits.
+ * \param[out] n_bits_total number of checked bits.
* \param[in] ubits input bits (456 bit).
+ * \returns dtx frame type. */
+enum gsm0503_amr_dtx_frames gsm0503_detect_afs_dtx_frame(int *n_errors, int *n_bits_total,
+ const ubit_t *ubits)
+{
+ int mode_id; /* unused */
+ sbit_t sbits[456];
+
+ osmo_ubit2sbit(&sbits[0], &ubits[0], sizeof(sbits));
+ return gsm0503_detect_afs_dtx_frame2(n_errors, n_bits_total, &mode_id, &sbits[0]);
+}
+
+/*! Detect HR AMR DTX frame in unmapped, deinterleaved frame bits.
* \param[out] n_errors number of errornous bits.
* \param[out] n_bits_total number of checked bits.
+ * \param[out] mode_id codec ID (CMI or CMC/CMR).
+ * \param[out] mode_id codec mode ID (0..3 or -1).
+ * \param[in] sbits input soft-bits (456 bit).
* \returns dtx frame type, */
-enum gsm0503_amr_dtx_frames gsm0503_detect_ahs_dtx_frame(int *n_errors, int *n_bits_total, const ubit_t * ubits)
+enum gsm0503_amr_dtx_frames gsm0503_detect_ahs_dtx_frame2(int *n_errors, int *n_bits_total,
+ int *mode_id, const sbit_t *sbits)
{
- if (detect_ahs_sid_update(n_errors, n_bits_total, ubits))
+ if (detect_ahs_sid_update(n_errors, n_bits_total, sbits))
return AHS_SID_UPDATE;
- if (detect_ahs_sid_first_inh(n_errors, n_bits_total, ubits))
+ if (detect_ahs_sid_first_inh(n_errors, n_bits_total, sbits))
return AHS_SID_FIRST_INH;
- if (detect_ahs_sid_update_inh(n_errors, n_bits_total, ubits))
+ if (detect_ahs_sid_update_inh(n_errors, n_bits_total, sbits))
return AHS_SID_UPDATE_INH;
- if (detect_ahs_sid_first_p1(n_errors, n_bits_total, ubits))
+ if (detect_ahs_sid_first_p1(n_errors, n_bits_total, sbits))
return AHS_SID_FIRST_P1;
- if (detect_ahs_sid_first_p2(n_errors, n_bits_total, ubits))
+ if ((*mode_id = detect_ahs_sid_first_p2(n_errors, n_bits_total, sbits)) != -1)
return AHS_SID_FIRST_P2;
- if (detect_ahs_onset(n_errors, n_bits_total, ubits))
+ if ((*mode_id = detect_ahs_onset(n_errors, n_bits_total, sbits)) != -1)
return AHS_ONSET;
*n_errors = 0;
*n_bits_total = 0;
return AMR_OTHER;
}
+
+/*! Detect HR AMR DTX frame in unmapped, deinterleaved frame bits.
+ * DEPRECATED: use gsm0503_detect_ahs_dtx_frame2() instead.
+ * \param[out] n_errors number of errornous bits.
+ * \param[out] n_bits_total number of checked bits.
+ * \param[in] ubits input bits (456 bit).
+ * \returns dtx frame type, */
+enum gsm0503_amr_dtx_frames gsm0503_detect_ahs_dtx_frame(int *n_errors, int *n_bits_total,
+ const ubit_t *ubits)
+{
+ int mode_id; /* unused */
+ sbit_t sbits[456];
+
+ osmo_ubit2sbit(&sbits[0], &ubits[0], sizeof(sbits));
+ return gsm0503_detect_ahs_dtx_frame2(n_errors, n_bits_total, &mode_id, &sbits[0]);
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.