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} __packed; +struct bt_base { + uint8_t big_id; + uint32_t pres_delay; + uint8_t next_bis_index; + struct queue *subgroups; +}; + +struct bt_subgroup { + uint8_t index; + struct bt_bap_codec codec; + struct iovec *caps; + struct iovec *meta; + struct queue *bises; +}; + +struct bt_bis { + uint8_t index; + struct iovec *caps; +}; + /* Contains local bt_bap_db */ static struct queue *bap_db; static struct queue *bap_cbs; @@ -5492,3 +5512,347 @@ void bt_bap_update_bcast_source(struct bt_bap_pac *pac, bap_pac_merge(pac, data, metadata); pac->codec = *codec; } + +static void destroy_base_bis(void *data) +{ + struct bt_bis *bis = data; + + if (!bis) + return; + + if (bis->caps) + util_iov_free(bis->caps, 1); + + free(bis); +} + +static void generate_bis_base(void *data, void *user_data) +{ + struct bt_bis *bis = data; + struct iovec *base_iov = user_data; + uint8_t cc_length = bis->caps->iov_len; + + if (!util_iov_push_u8(base_iov, bis->index)) + return; + + if (!util_iov_push_u8(base_iov, cc_length)) + return; + + if (cc_length) + util_iov_push_mem(base_iov, bis->caps->iov_len, + bis->caps->iov_base); +} + +static void generate_subgroup_base(void *data, void *user_data) +{ + struct bt_subgroup *sgrp = data; + struct iovec *base_iov = user_data; + + if (!util_iov_push_u8(base_iov, queue_length(sgrp->bises))) + return; + + if (!util_iov_push_u8(base_iov, sgrp->codec.id)) + return; + + if (!util_iov_push_le16(base_iov, sgrp->codec.cid)) + return; + + if (!util_iov_push_le16(base_iov, sgrp->codec.vid)) + return; + + if (sgrp->caps) { + if (!util_iov_push_u8(base_iov, sgrp->caps->iov_len)) + return; + + if (sgrp->caps->iov_len) + util_iov_push_mem(base_iov, sgrp->caps->iov_len, + sgrp->caps->iov_base); + } else if (!util_iov_push_u8(base_iov, 0)) + return; + + if (sgrp->meta) { + if (!util_iov_push_u8(base_iov, sgrp->meta->iov_len)) + return; + + if (sgrp->meta->iov_len) + util_iov_push_mem(base_iov, sgrp->meta->iov_len, + sgrp->meta->iov_base); + } else if (!util_iov_push_u8(base_iov, 0)) + return; + + queue_foreach(sgrp->bises, generate_bis_base, base_iov); +} + +static struct iovec *generate_base(struct bt_base *base) +{ + struct iovec *base_iov = new0(struct iovec, 0x1); + + base_iov->iov_base = util_malloc(BASE_MAX_LENGTH); + + if (!util_iov_push_le24(base_iov, base->pres_delay)) + return NULL; + + if (!util_iov_push_u8(base_iov, + queue_length(base->subgroups))) + return NULL; + + queue_foreach(base->subgroups, generate_subgroup_base, + base_iov); + + return base_iov; +} + +static void add_new_bis(struct bt_subgroup *subgroup, + uint8_t bis_index, struct iovec *caps) +{ + struct bt_bis *bis = new0(struct bt_bis, 1); + + bis->index = bis_index; + + if (caps) + bis->caps = caps; + else + bis->caps = new0(struct iovec, 1); + + queue_push_tail(subgroup->bises, bis); +} + +static void add_new_subgroup(struct bt_base *base, + struct bt_bap_stream *stream) +{ + struct bt_bap_pac *lpac = stream->lpac; + struct bt_subgroup *sgrp = new0( + struct bt_subgroup, 1); + uint16_t cid = 0; + uint16_t vid = 0; + + bt_bap_pac_get_vendor_codec(lpac, &sgrp->codec.id, &cid, + &vid, NULL, NULL); + sgrp->codec.cid = cid; + sgrp->codec.vid = vid; + sgrp->caps = util_iov_dup(stream->cc, 1); + sgrp->meta = util_iov_dup(stream->meta, 1); + sgrp->bises = queue_new(); + + stream->qos.bcast.bis = base->next_bis_index++; + add_new_bis(sgrp, stream->qos.bcast.bis, + NULL); + queue_push_tail(base->subgroups, sgrp); +} + +struct bt_ltv_match { + uint8_t l; + uint8_t *v; + bool found; +}; + +struct bt_ltv_search { + struct iovec *iov; + bool found; +}; + +static void match_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, + void *user_data) +{ + struct bt_ltv_match *ltv_match = user_data; + + if (ltv_match->found == true) + return; + + if (ltv_match->l != l) + return; + + if (!memcmp(v, ltv_match->v, l)) + ltv_match->found = true; +} + +static void search_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, + void *user_data) +{ + struct bt_ltv_search *ltv_search = user_data; + struct bt_ltv_match ltv_match; + + ltv_match.found = false; + ltv_match.l = l; + ltv_match.v = v; + + util_ltv_foreach(ltv_search->iov->iov_base, + ltv_search->iov->iov_len, &t, + match_ltv, <v_match); + + /* Once "found" has been updated to "false", + * do not overwrite it anymore. + * It means that an ltv was not found in the search list, + * and this should be detected back in the parent function. + */ + if (ltv_search->found) + ltv_search->found = ltv_match.found; +} + +static bool compare_ltv(struct iovec *iov1, + struct iovec *iov2) +{ + struct bt_ltv_search ltv_search; + + if ((!iov1) && (!iov2)) + return true; + + if ((!iov1) || (!iov2)) + return false; + + /* Compare metadata length */ + if (iov1->iov_len != iov2->iov_len) + return false; + + ltv_search.found = true; + ltv_search.iov = iov2; + + util_ltv_foreach(iov1->iov_base, + iov1->iov_len, NULL, + search_ltv, <v_search); + + return ltv_search.found; +} + +struct bt_ltv_extract { + struct iovec *result; + struct iovec *src; +}; + +static void extract_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, + void *user_data) +{ + struct bt_ltv_extract *ext_data = user_data; + struct bt_ltv_match ltv_match; + uint8_t ltv_len = 0; + + ltv_match.found = false; + ltv_match.l = l; + ltv_match.v = v; + + /* Search each BIS caps ltv in subgroup caps + * to extract the one that are BIS specific + */ + util_ltv_foreach(ext_data->src->iov_base, + ext_data->src->iov_len, &t, + match_ltv, <v_match); + + if (!ltv_match.found) { + ltv_len = l + 1; + iov_append(ext_data->result, 1, <v_len); + iov_append(ext_data->result, 1, &t); + iov_append(ext_data->result, l, &v); + } +} + +static struct iovec *extract_diff_caps( + struct iovec *subgroup_caps, struct iovec *bis_caps) +{ + struct bt_ltv_extract ext_data; + + ext_data.src = subgroup_caps; + ext_data.result = new0(struct iovec, 1); + + util_ltv_foreach(bis_caps->iov_base, + bis_caps->iov_len, NULL, + extract_ltv, &ext_data); + + return ext_data.result; +} + +static void set_base_subgroup(void *data, void *user_data) +{ + struct bt_bap_stream *stream = data; + struct bt_base *base = user_data; + /* BIS specific codec capabilities */ + struct iovec *bis_caps; + + if (bt_bap_pac_get_type(stream->lpac) != BT_BAP_BCAST_SOURCE) + return; + + if (stream->qos.bcast.big != base->big_id) + return; + + if (base->pres_delay < stream->qos.bcast.delay) + base->pres_delay = stream->qos.bcast.delay; + + if (queue_isempty(base->subgroups)) { + add_new_subgroup(base, stream); + } else { + /* Verify if a subgroup has the same metadata */ + const struct queue_entry *entry; + struct bt_subgroup *subgroup = NULL; + bool same_meta = false; + + for (entry = queue_get_entries(base->subgroups); + entry; entry = entry->next) { + subgroup = entry->data; + same_meta = compare_ltv(subgroup->meta, stream->meta); + if (same_meta) + break; + } + + if (!same_meta) { + /* No subgroup with the same metadata found. + * Create a new one. + */ + add_new_subgroup(base, stream); + } else { + /* Subgroup found with the same metadata. + * Extract different codec capabilities. + */ + bis_caps = extract_diff_caps( + subgroup->caps, + stream->cc); + + stream->qos.bcast.bis = base->next_bis_index++; + add_new_bis(subgroup, + stream->qos.bcast.bis, + bis_caps); + } + } +} + +static void destroy_base_subgroup(void *data) +{ + struct bt_subgroup *subgroup = data; + + if (!subgroup) + return; + + if (subgroup->caps) + util_iov_free(subgroup->caps, 1); + + if (subgroup->meta) + util_iov_free(subgroup->meta, 1); + + queue_destroy(subgroup->bises, destroy_base_bis); + + free(subgroup); +} + +/* + * Function to update the BASE using configuration data + * from each BIS belonging to the same BIG + */ +struct iovec *bt_bap_stream_get_base(struct bt_bap_stream *stream) +{ + struct bt_base base; + struct iovec *base_iov; + + base.subgroups = queue_new(); + base.next_bis_index = 1; + base.big_id = stream->qos.bcast.big; + + /* + * Create subgroups with each different Metadata and Codec + * Specific Configuration from all streams having the same BIG ID. + */ + queue_foreach(stream->bap->streams, set_base_subgroup, &base); + + base_iov = generate_base(&base); + + queue_destroy(base.subgroups, destroy_base_subgroup); + + return base_iov; +} diff --git a/src/shared/bap.h b/src/shared/bap.h index 51edc08ab..2c3550921 100644 --- a/src/shared/bap.h +++ b/src/shared/bap.h @@ -88,6 +88,7 @@ struct bt_bap_bcast_qos { uint16_t timeout; uint8_t pa_sync; struct bt_bap_io_qos io_qos; + uint32_t delay; /* Presentation Delay */ }; struct bt_bap_qos { @@ -321,3 +322,4 @@ void bt_bap_update_bcast_source(struct bt_bap_pac *pac, bool bt_bap_pac_bcast_is_local(struct bt_bap *bap, struct bt_bap_pac *pac); +struct iovec *bt_bap_stream_get_base(struct bt_bap_stream *stream);