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fmtp wip 

Change-Id: Ic7e10748ca1bcc0fa819779c8bda1d4f0a3b1092
This commit is contained in:
Neels Hofmeyr 2022-09-12 03:40:25 +02:00
parent b3be16e152
commit 80740dea04
2 changed files with 59 additions and 0 deletions
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3
include/osmocom/msc/codec_sdp_cc_t9n.h
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@ -50,6 +50,9 @@ const struct codec_mapping *codec_mapping_by_perm_speech(enum gsm0808_permitted_
const struct codec_mapping *codec_mapping_by_subtype_name(const char *subtype_name);
const struct codec_mapping *codec_mapping_by_mgcp_codec(enum mgcp_codecs mgcp);
int amr_fmtp_from_gsm0808_speech_codec(char *buf, size_t buflen, const struct gsm0808_speech_codec *sc);
int amr_fmtp_to_gsm0808_speech_codec(struct gsm0808_speech_codec *sc, const char *fmtp);
int bearer_cap_add_speech_ver(struct gsm_mncc_bearer_cap *bearer_cap, enum gsm48_bcap_speech_ver speech_ver);
int sdp_audio_codec_add_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codec *codec);
int sdp_audio_codecs_to_bearer_cap(struct gsm_mncc_bearer_cap *bearer_cap, const struct sdp_audio_codecs *ac);

56
src/libmsc/codec_sdp_cc_t9n.c
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@ -284,6 +284,62 @@ const struct codec_mapping *codec_mapping_by_mgcp_codec(enum mgcp_codecs mgcp)
return NULL;
}
/* Return a bitmask of active AMR rates given the speec codec config nr, i.e. the column nr in 3GPP TS 28.062, Table
* 7.11.3.1.3-2, a.k.a. S0-S15. The full_rate flag is needed because config nr 1 is special: it includes 12.2k on FR but
* excludes it on HR. Iff full_rate == true, 12.2k is included for sc_cfg_nr == 1. */
uint8_t amr_rates_from_speech_codec_cfg_nr(uint8_t sc_cfg_nr, bool full_rate)
{
#define B(BIT) (1 << (BIT))
#define RATE_4_75 B(0)
#define RATE_5_15 B(1)
#define RATE_5_90 B(2)
#define RATE_6_70 B(3)
#define RATE_7_40 B(4)
#define RATE_7_95 B(5)
#define RATE_10_2 B(6)
#define RATE_12_2 B(7)
static const uint8_t _amr_rates_from_speech_codec_cfg_nr[] = {
[0] = RATE_4_75,
[1] = RATE_4_75 | RATE_5_90 | RATE_7_40 | RATE_12_2,
[2] = RATE_5_90,
[3] = RATE_6_70,
[4] = RATE_7_40,
[5] = RATE_7_95,
[6] = RATE_10_2,
[7] = RATE_12_2,
[8] = RATE_4_75 | RATE_5_90,
[9] = RATE_4_75 | RATE_5_90 | RATE_6_70,
[10] = RATE_4_75 | RATE_5_90 | RATE_6_70 | RATE_7_40,
[11] = RATE_4_75 | RATE_5_90 | RATE_6_70 | RATE_7_40,
[12] = RATE_4_75 | RATE_5_90 | RATE_6_70 | RATE_10_2,
[13] = RATE_4_75 | RATE_5_90 | RATE_6_70 | RATE_10_2,
[14] = RATE_4_75 | RATE_5_90 | RATE_7_95 | RATE_12_2,
[15] = RATE_4_75 | RATE_5_90 | RATE_7_95 | RATE_12_2,
};
uint8_t ret;
OSMO_ASSERT(sc_cfg_nr < ARRAY_SIZE(_amr_rates_from_speech_codec_cfg_nr));
ret = _amr_rates_from_speech_codec_cfg_nr[sc_cfg_nr];
if (!full_rate && sc_cfg_nr == 1)
ret &= ~RATE_12_2;
return ret;
}
int amr_fmtp_from_gsm0808_speech_codec(char *buf, size_t buflen, const struct gsm0808_speech_codec *sc)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
/* 3GPP TS 26.103 says "The bandwidth efficient mode of RFC 4867 shall be used. To offer the bandwidth-efficient
* mode, the octet-align parameter should be omitted in SDP." So never include 'octet-align=1'.
*/
/* Accumulate rates that are allowed by the cfg bits */
uint8_t mode_sets = 0;
}
int amr_fmtp_to_gsm0808_speech_codec(struct gsm0808_speech_codec *sc, const char *fmtp)
{
}
/* Append given Speech Version to the end of the Bearer Capabilities Speech Version array. Return 1 if added, zero
* otherwise (as in, return the number of items added). */
int bearer_cap_add_speech_ver(struct gsm_mncc_bearer_cap *bearer_cap, enum gsm48_bcap_speech_ver speech_ver)