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/*! \file codec.h */
#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/bits.h>
/* TS 101318 Chapter 5.1: 260 bits + 4bit sig */
#define GSM_FR_BYTES 33
/* TS 101318 Chapter 5.2: 112 bits, no sig */
#define GSM_HR_BYTES 14
/* TS 101318 Chapter 5.3: 244 bits + 4bit sig */
#define GSM_EFR_BYTES 31
/* Number of bytes of an GSM_HR RTP payload */
#define GSM_HR_BYTES_RTP_RFC5993 (GSM_HR_BYTES + 1)
#define GSM_HR_BYTES_RTP_TS101318 (GSM_HR_BYTES)
extern const uint16_t gsm610_bitorder[]; /* FR */
extern const uint16_t gsm620_unvoiced_bitorder[]; /* HR unvoiced */
extern const uint16_t gsm620_voiced_bitorder[]; /* HR voiced */
extern const uint16_t gsm660_bitorder[]; /* EFR */
extern const uint16_t gsm690_12_2_bitorder[]; /* AMR 12.2 kbits */
extern const uint16_t gsm690_10_2_bitorder[]; /* AMR 10.2 kbits */
extern const uint16_t gsm690_7_95_bitorder[]; /* AMR 7.95 kbits */
extern const uint16_t gsm690_7_4_bitorder[]; /* AMR 7.4 kbits */
extern const uint16_t gsm690_6_7_bitorder[]; /* AMR 6.7 kbits */
extern const uint16_t gsm690_5_9_bitorder[]; /* AMR 5.9 kbits */
extern const uint16_t gsm690_5_15_bitorder[]; /* AMR 5.15 kbits */
extern const uint16_t gsm690_4_75_bitorder[]; /* AMR 4.75 kbits */
extern const uint8_t osmo_gsm611_silence_frame[GSM_FR_BYTES];
extern const struct value_string osmo_amr_type_names[];
enum osmo_amr_type {
AMR_4_75 = 0,
AMR_5_15 = 1,
AMR_5_90 = 2,
AMR_6_70 = 3,
AMR_7_40 = 4,
AMR_7_95 = 5,
AMR_10_2 = 6,
AMR_12_2 = 7,
AMR_SID = 8,
AMR_GSM_EFR_SID = 9,
AMR_TDMA_EFR_SID = 10,
AMR_PDC_EFR_SID = 11,
AMR_NO_DATA = 15,
};
static inline const char *osmo_amr_type_name(enum osmo_amr_type type)
{ return get_value_string(osmo_amr_type_names, type); }
enum osmo_amr_quality {
AMR_BAD = 0,
AMR_GOOD = 1
};
extern const uint8_t gsm690_bitlength[AMR_NO_DATA+1];
int osmo_amr_s_to_d(ubit_t *out, const ubit_t *in, uint16_t n_bits, enum osmo_amr_type amr_mode);
int osmo_amr_d_to_s(ubit_t *out, const ubit_t *in, uint16_t n_bits, enum osmo_amr_type amr_mode);
/*! Check if given AMR Frame Type is a speech frame
* \param[in] ft AMR Frame Type
* \returns true if AMR with given Frame Type contains voice, false otherwise
*/
static inline bool osmo_amr_is_speech(enum osmo_amr_type ft)
{
switch (ft) {
case AMR_4_75:
case AMR_5_15:
case AMR_5_90:
case AMR_6_70:
case AMR_7_40:
case AMR_7_95:
case AMR_10_2:
case AMR_12_2:
return true;
default:
return false;
}
}
/* SID ternary classification per GSM 06.31 & 06.81 section 6.1.1 */
enum osmo_gsm631_sid_class {
OSMO_GSM631_SID_CLASS_SPEECH = 0,
OSMO_GSM631_SID_CLASS_INVALID = 1,
OSMO_GSM631_SID_CLASS_VALID = 2,
};
bool osmo_fr_check_sid(const uint8_t *rtp_payload, size_t payload_len);
bool osmo_hr_check_sid(const uint8_t *rtp_payload, size_t payload_len);
bool osmo_efr_check_sid(const uint8_t *rtp_payload, size_t payload_len);
enum osmo_gsm631_sid_class osmo_fr_sid_classify(const uint8_t *rtp_payload);
enum osmo_gsm631_sid_class osmo_efr_sid_classify(const uint8_t *rtp_payload);
/*! Check if given FR codec frame is any kind of SID, valid or invalid
* \param[in] rtp_payload Buffer with RTP payload
* \returns true if the frame is an "accepted SID frame" in GSM 06.31
* definition, false otherwise.
*/
static inline bool osmo_fr_is_any_sid(const uint8_t *rtp_payload)
{
enum osmo_gsm631_sid_class sidc;
sidc = osmo_fr_sid_classify(rtp_payload);
return sidc != OSMO_GSM631_SID_CLASS_SPEECH;
}
/*! Check if given EFR codec frame is any kind of SID, valid or invalid
* \param[in] rtp_payload Buffer with RTP payload
* \returns true if the frame is an "accepted SID frame" in GSM 06.81
* definition, false otherwise.
*/
static inline bool osmo_efr_is_any_sid(const uint8_t *rtp_payload)
{
enum osmo_gsm631_sid_class sidc;
sidc = osmo_efr_sid_classify(rtp_payload);
return sidc != OSMO_GSM631_SID_CLASS_SPEECH;
}
bool osmo_fr_sid_preen(uint8_t *rtp_payload);
bool osmo_efr_sid_preen(uint8_t *rtp_payload);
void osmo_fr_sid_reset(uint8_t *rtp_payload);
void osmo_hr_sid_reset(uint8_t *rtp_payload);
void osmo_efr_sid_reset(uint8_t *rtp_payload);
int osmo_amr_rtp_enc(uint8_t *payload, uint8_t cmr, enum osmo_amr_type ft,
enum osmo_amr_quality bfi);
int osmo_amr_rtp_dec(const uint8_t *payload, int payload_len, uint8_t *cmr,
int8_t *cmi, enum osmo_amr_type *ft,
enum osmo_amr_quality *bfi, int8_t *sti);
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