#include #include #include #include /* Add all known payload types encountered in GSM networks */ static void sdp_add_all_mobile_codecs(struct sdp_audio_codecs *ac) { /* In order of preference. TODO: make configurable */ static const enum gsm48_bcap_speech_ver mobile_codecs[] = { GSM48_BCAP_SV_AMR_F /*!< 4 GSM FR V3 (FR AMR) */, GSM48_BCAP_SV_AMR_H /*!< 5 GSM HR V3 (HR_AMR) */, GSM48_BCAP_SV_EFR /*!< 2 GSM FR V2 (GSM EFR) */, GSM48_BCAP_SV_FR /*!< 0 GSM FR V1 (GSM FR) */, GSM48_BCAP_SV_HR /*!< 1 GSM HR V1 (GSM HR) */, }; int i; for (i = 0; i < ARRAY_SIZE(mobile_codecs); i++) sdp_audio_codecs_add_speech_ver(ac, mobile_codecs[i]); } /* Add all known AMR payload types encountered in UTRAN networks */ static void sdp_add_all_utran_codecs(struct sdp_audio_codecs *ac) { /* In order of preference. TODO: make configurable */ static const enum gsm48_bcap_speech_ver utran_codecs[] = { GSM48_BCAP_SV_AMR_F /*!< 4 GSM FR V3 (FR AMR) */, GSM48_BCAP_SV_AMR_H /*!< 5 GSM HR V3 (HR_AMR) */, GSM48_BCAP_SV_AMR_OH /*!< 11 GSM HR V6 (OHR AMR) */, GSM48_BCAP_SV_AMR_FW /*!< 8 GSM FR V5 (FR AMR-WB) */, GSM48_BCAP_SV_AMR_OFW /*!< 6 GSM FR V4 (OFR AMR-WB) */, GSM48_BCAP_SV_AMR_OHW /*!< 7 GSM HR V4 (OHR AMR-WB) */, }; int i; for (i = 0; i < ARRAY_SIZE(utran_codecs); i++) sdp_audio_codecs_add_speech_ver(ac, utran_codecs[i]); } static void cc_sdp_set_ran(struct cc_sdp *cc_sdp, enum osmo_rat_type ran_type) { cc_sdp->ran = (struct sdp_audio_codecs){}; switch (ran_type) { default: case OSMO_RAT_GERAN_A: sdp_add_all_mobile_codecs(&cc_sdp->ran); break; case OSMO_RAT_UTRAN_IU: sdp_add_all_utran_codecs(&cc_sdp->ran); break; } } void cc_sdp_init(struct cc_sdp *cc_sdp, enum osmo_rat_type ran_type, const struct gsm_mncc_bearer_cap *ms_bearer_cap, const struct gsm0808_speech_codec_list *codec_list_bss_supported) { *cc_sdp = (struct cc_sdp){}; cc_sdp_set_ran(cc_sdp, ran_type); if (ms_bearer_cap) sdp_audio_codecs_from_bearer_cap(&cc_sdp->ms, ms_bearer_cap); if (codec_list_bss_supported) cc_sdp_set_cell(cc_sdp, codec_list_bss_supported); } void cc_sdp_set_cell(struct cc_sdp *cc_sdp, const struct gsm0808_speech_codec_list *codec_list_bss_supported) { cc_sdp->cell = (struct sdp_audio_codecs){}; if (codec_list_bss_supported) sdp_audio_codecs_from_speech_codec_list(&cc_sdp->cell, codec_list_bss_supported); } /* Render intersections of all known audio codec constraints to reach a resulting choice of favorite audio codec, plus * possible set of alternative audio codecs, in cc_sdp->result. (The result.rtp address remains unchanged.) */ int cc_sdp_filter(struct cc_sdp *cc_sdp) { struct sdp_audio_codecs *r = &cc_sdp->result.audio_codecs; struct sdp_audio_codec *a = &cc_sdp->assignment; *r = cc_sdp->ran; if (cc_sdp->ms.count) sdp_audio_codecs_intersection(r, &cc_sdp->ms, false); if (cc_sdp->cell.count) sdp_audio_codecs_intersection(r, &cc_sdp->cell, false); if (cc_sdp->remote.audio_codecs.count) sdp_audio_codecs_intersection(r, &cc_sdp->remote.audio_codecs, true); #if ALLOW_REASSIGNMENT /* If osmo-msc were able to trigger a re-assignment after the remote side has picked a codec mismatching the * initial Assignment, then this code here would make sense: keep the other codecs as available to choose from, * but put the currently assigned codec in the first position. */ if (a->subtype_name[0]) { /* Assignment has completed, the chosen codec should be the first of the resulting SDP. * Make sure this is actually listed in the result SDP and move to first place. */ struct sdp_audio_codec *select = sdp_audio_codec_by_descr(r, a); if (!select) { /* Not present. Add. */ if (sdp_audio_codec_by_payload_type(r, a->payload_type, false)) { /* Oh crunch, that payload type number is already in use. * Find an unused one. */ for (a->payload_type = 96; a->payload_type <= 127; a->payload_type++) { if (!sdp_audio_codec_by_payload_type(r, a->payload_type, false)) break; } if (a->payload_type > 127) return -ENOSPC; } select = sdp_audio_codec_add_copy(r, a); } sdp_audio_codecs_select(r, select); } #else /* Currently, osmo-msc does not trigger re-assignment if the remote side has picked a codec that the local side * would also support, but the local side has already assigned a mismatching codec before. Mismatching codecs * means call failure. So, currently, if locally, Assignment has already happened, it makes sense to send only * the assigned codec as available choice to the remote side. */ if (a->subtype_name[0]) { /* Assignment has completed, the chosen codec should be the the only possible one. */ struct sdp_audio_codecs assigned_codec = {}; sdp_audio_codec_add_copy(&assigned_codec, a); sdp_audio_codecs_intersection(r, &assigned_codec, false); } #endif return 0; } int cc_sdp_name_buf(char *buf, size_t buflen, const struct cc_sdp *cc_sdp) { struct osmo_strbuf sb = { .buf = buf, .len = buflen }; OSMO_STRBUF_PRINTF(sb, "RAN={"); OSMO_STRBUF_APPEND(sb, sdp_audio_codecs_name_buf, &cc_sdp->ran); OSMO_STRBUF_PRINTF(sb, "}"); if (cc_sdp->cell.count) { OSMO_STRBUF_PRINTF(sb, " cell={"); OSMO_STRBUF_APPEND(sb, sdp_audio_codecs_name_buf, &cc_sdp->cell); OSMO_STRBUF_PRINTF(sb, "}"); } if (cc_sdp->ms.count) { OSMO_STRBUF_PRINTF(sb, " MS={"); OSMO_STRBUF_APPEND(sb, sdp_audio_codecs_name_buf, &cc_sdp->ms); OSMO_STRBUF_PRINTF(sb, "}"); } if (cc_sdp->remote.audio_codecs.count || osmo_sockaddr_str_is_nonzero(&cc_sdp->remote.rtp)) { OSMO_STRBUF_PRINTF(sb, " remote="); OSMO_STRBUF_APPEND(sb, sdp_msg_name_buf, &cc_sdp->remote); } if (cc_sdp->assignment.subtype_name[0]) { OSMO_STRBUF_PRINTF(sb, " assigned="); OSMO_STRBUF_APPEND(sb, sdp_audio_codec_name_buf, &cc_sdp->assignment); } OSMO_STRBUF_PRINTF(sb, " result="); OSMO_STRBUF_APPEND(sb, sdp_msg_name_buf, &cc_sdp->result); return sb.chars_needed; } char *cc_sdp_name_c(void *ctx, const struct cc_sdp *cc_sdp) { OSMO_NAME_C_IMPL(ctx, 128, "cc_sdp_name_c-ERROR", cc_sdp_name_buf, cc_sdp) } const char *cc_sdp_name(const struct cc_sdp *cc_sdp) { return cc_sdp_name_c(OTC_SELECT, cc_sdp); }