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Each BIS observed capabilities LTV is compared to the local capabilities and when we have a full LTVs match a PAC record is created for that BIS. Also a MediaEndpoint is registered over DBUS and the stream can be enabled using the SetConfiguration DBUS call. --- src/shared/bap.c | 266 ++++++++++++++++++++++++++++++++++++++++++++++- src/shared/bap.h | 7 ++ 2 files changed, 268 insertions(+), 5 deletions(-) diff --git a/src/shared/bap.c b/src/shared/bap.c index 50d03456e6cd..b84760da4510 100644 --- a/src/shared/bap.c +++ b/src/shared/bap.c @@ -48,6 +48,15 @@ #define BAP_PROCESS_TIMEOUT 10 +#define BAP_FREQ_LTV_TYPE 1 +#define BAP_DURATION_LTV_TYPE 2 +#define BAP_CHANNEL_ALLOCATION_LTV_TYPE 3 +#define BAP_FRAME_LEN_LTV_TYPE 4 +#define CODEC_SPECIFIC_CONFIGURATION_MASK (\ + (1<l != l) return; - if (!memcmp(v, ltv_match->v, l)) + if (!memcmp(v, ltv_match->data, l)) ltv_match->found = true; } @@ -6034,7 +6044,7 @@ static void search_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, ltv_match.found = false; ltv_match.l = l; - ltv_match.v = v; + ltv_match.data = v; util_ltv_foreach(ltv_search->iov->iov_base, ltv_search->iov->iov_len, &t, @@ -6075,8 +6085,10 @@ static bool compare_ltv(struct iovec *iov1, } struct bt_ltv_extract { - struct iovec *result; struct iovec *src; + void *value; + uint8_t len; + struct iovec *result; }; static void extract_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, @@ -6088,7 +6100,7 @@ static void extract_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, ltv_match.found = false; ltv_match.l = l; - ltv_match.v = v; + ltv_match.data = v; /* Search each BIS caps ltv in subgroup caps * to extract the one that are BIS specific @@ -6221,3 +6233,247 @@ struct iovec *bt_bap_stream_get_base(struct bt_bap_stream *stream) return base_iov; } + +static void bap_sink_get_allocation(size_t i, uint8_t l, uint8_t t, + uint8_t *v, void *user_data) +{ + uint32_t location32; + + if (!v) + return; + + memcpy(&location32, v, l); + *((uint32_t *)user_data) = le32_to_cpu(location32); +} + +/* + * This function compares PAC Codec Specific Capabilities, with the Codec + * Specific Configuration LTVs received in the BASE of the BAP Source. The + * result is accumulated in data32 which is a bitmask of types. + */ +static void check_pac_caps_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v, + void *user_data) +{ + struct bt_ltv_match *compare_data = user_data; + uint8_t *bis_v = compare_data->data; + uint16_t mask; + uint16_t min; + uint16_t max; + uint16_t frame_len; + + switch (t) { + case BAP_FREQ_LTV_TYPE: + mask = *((uint16_t *)v); + mask = le16_to_cpu(mask); + if (mask & (1 << (bis_v[0] - 1))) + compare_data->data32 |= 1<data32 |= 1<= min) && + (frame_len <= max)) + compare_data->data32 |= 1<data; + struct bt_ltv_match compare_data; + + compare_data.data = v; + + /* Search inside local PAC's caps for LTV of type t */ + util_ltv_foreach(pac_caps->iov_base, pac_caps->iov_len, &t, + check_pac_caps_ltv, &compare_data); + + local_data->data32 |= compare_data.data32; +} + +static void bap_sink_check_level3_ltv(size_t i, uint8_t l, uint8_t t, + uint8_t *v, void *user_data) +{ + struct bt_ltv_extract *merge_data = user_data; + + merge_data->value = v; + merge_data->len = l; +} + +static void bap_sink_check_level2_ltv(size_t i, uint8_t l, uint8_t t, + uint8_t *v, void *user_data) +{ + struct bt_ltv_extract *merge_data = user_data; + + merge_data->value = NULL; + util_ltv_foreach(merge_data->src->iov_base, + merge_data->src->iov_len, + &t, + bap_sink_check_level3_ltv, merge_data); + + /* If the LTV at level 2 was found at level 3 add the one from level 3, + * otherwise add the one at level 2 + */ + if (merge_data->value) + util_ltv_push(merge_data->result, merge_data->len, + t, merge_data->value); + else + util_ltv_push(merge_data->result, l, t, v); +} + +static void check_local_pac(void *data, void *user_data) +{ + struct bt_ltv_match *compare_data = user_data; + struct iovec *bis_data = (struct iovec *)compare_data->data; + const struct bt_bap_pac *pac = data; + + /* Keep searching for a matching PAC if one wasn't found + * in previous PAC element + */ + if (compare_data->found == false) { + struct bt_ltv_match bis_compare_data = { + .data = pac->data, + .data32 = 0, /* LTVs bitmask result */ + .found = false + }; + + /* loop each BIS LTV */ + util_ltv_foreach(bis_data->iov_base, bis_data->iov_len, NULL, + check_source_ltv, &bis_compare_data); + + /* We have a match if all selected LTVs have a match */ + if ((bis_compare_data.data32 & + CODEC_SPECIFIC_CONFIGURATION_MASK) == + CODEC_SPECIFIC_CONFIGURATION_MASK) + compare_data->found = true; + } +} + +static void bap_sink_match_allocation(size_t i, uint8_t l, uint8_t t, + uint8_t *v, void *user_data) +{ + struct bt_ltv_match *data = user_data; + uint32_t location32; + + if (!v) + return; + + memcpy(&location32, v, l); + location32 = le32_to_cpu(location32); + + /* If all the bits in the received bitmask are found in + * the local bitmask then we have a match + */ + if ((location32 & data->data32) == location32) + data->found = true; + else + data->found = false; +} + +static bool bap_check_bis(struct bt_bap_db *ldb, struct iovec *bis_data) +{ + struct bt_ltv_match compare_data = {}; + + /* Check channel allocation against the PACS location. + * If we don't have a location set we can accept any BIS location. + * If the BIS doesn't have a location set we also accept it + */ + compare_data.found = true; + + if (ldb->pacs->sink_loc_value) { + uint8_t type = BAP_CHANNEL_ALLOCATION_LTV_TYPE; + + compare_data.data32 = ldb->pacs->sink_loc_value; + util_ltv_foreach(bis_data->iov_base, bis_data->iov_len, &type, + bap_sink_match_allocation, &compare_data); + } + + /* Check remaining LTVs against the PACs list */ + if (compare_data.found) { + compare_data.data = bis_data; + compare_data.found = false; + queue_foreach(ldb->broadcast_sinks, check_local_pac, + &compare_data); + } + + return compare_data.found; +} + +void bt_bap_add_bis(struct bt_bap *bap, uint8_t bis_index, + struct bt_bap_codec *codec, + struct iovec *l2_caps, + struct iovec *l3_caps, + struct iovec *meta) +{ + struct bt_bap_pac *pac_source_bis; + struct bt_bap_endpoint *ep; + int err = 0; + struct bt_bap_pac_qos bis_qos = {0}; + uint8_t type = 0; + struct bt_ltv_extract merge_data = {0}; + + merge_data.src = l3_caps; + merge_data.result = new0(struct iovec, 1); + + /* Create a Codec Specific Configuration with LTVs at level 2 (subgroup) + * overwritten by LTVs at level 3 (BIS) + */ + util_ltv_foreach(l2_caps->iov_base, + l2_caps->iov_len, + NULL, + bap_sink_check_level2_ltv, &merge_data); + + /* Check each BIS Codec Specific Configuration LTVs against our Codec + * Specific Capabilities and if the BIS matches create a PAC with it + */ + if (bap_check_bis(bap->ldb, merge_data.result) == false) + goto cleanup; + + DBG(bap, "Matching BIS %i", bis_index); + + /* Create a QoS structure based on the received BIS information to + * specify the desired channel for this BIS/PAC + */ + type = BAP_CHANNEL_ALLOCATION_LTV_TYPE; + util_ltv_foreach(merge_data.result->iov_base, + merge_data.result->iov_len, &type, + bap_sink_get_allocation, &bis_qos.location); + + /* Create a remote PAC */ + pac_source_bis = bap_pac_new(bap->rdb, NULL, + BT_BAP_BCAST_SOURCE, codec, &bis_qos, + merge_data.result, meta); + + err = asprintf(&pac_source_bis->name, "%d", bis_index); + + if (err < 0) { + DBG(bap, "error in asprintf"); + goto cleanup; + } + + /* Add remote source endpoint */ + if (!bap->rdb->broadcast_sources) + bap->rdb->broadcast_sources = queue_new(); + queue_push_tail(bap->rdb->broadcast_sources, pac_source_bis); + + queue_foreach(bap->pac_cbs, notify_pac_added, pac_source_bis); + /* Push remote endpoint with direction sink */ + ep = bap_endpoint_new_broadcast(bap->rdb, BT_BAP_BCAST_SINK); + + if (ep) + queue_push_tail(bap->remote_eps, ep); + +cleanup: + util_iov_free(merge_data.result, 1); +} diff --git a/src/shared/bap.h b/src/shared/bap.h index e4785b587e3a..76f3fb0adab6 100644 --- a/src/shared/bap.h +++ b/src/shared/bap.h @@ -333,3 +333,10 @@ 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); + +void bt_bap_add_bis(struct bt_bap *bap, uint8_t bis_index, + struct bt_bap_codec *codec, + struct iovec *l2_caps, + struct iovec *l3_caps, + struct iovec *meta); +