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From: Silviu Florian Barbulescu <silviu.barbulescu@nxp.com>
To: linux-bluetooth@vger.kernel.org
Cc: mihai-octavian.urzica@nxp.com,
	silviu.barbulescu@nxp.com,
	vlad.pruteanu@nxp.com,
	andrei.istodorescu@nxp.com,
	luiz.dentz@gmail.com,
	iulia.tanasescu@nxp.com
Subject: [PATCH v3 2/2] shared/bap: Code for dynamically generated BASE
Date: Mon, 15 Jan 2024 00:41:04 +0200
Message-Id: <20240114224104.37716-3-silviu.barbulescu@nxp.com>
In-Reply-To: <20240114224104.37716-1-silviu.barbulescu@nxp.com>
References: <20240114224104.37716-1-silviu.barbulescu@nxp.com>
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Add code to support dynamically generated BASE from presets

---
 src/shared/bap.c | 492 +++++++++++++++++++++++++++++++++++++++++++++++
 src/shared/bap.h |   2 +
 2 files changed, 494 insertions(+)

diff --git a/src/shared/bap.c b/src/shared/bap.c
index 49eb8d057..fca6ab9cf 100644
--- a/src/shared/bap.c
+++ b/src/shared/bap.c
@@ -226,6 +226,7 @@ struct bt_bap_stream {
 	struct bt_bap_stream_io *io;
 	bool client;
 	void *user_data;
+	struct queue *bcast_links; /* Linked streams from the same BIG */
 };
 
 /* TODO: Figure out the capabilities types */
@@ -255,6 +256,30 @@ struct bt_pacs_context {
 	uint16_t  src;
 } __packed;
 
+struct bt_base_data {
+	uint32_t pres_delay;
+	struct queue *base_data_subgroup;
+};
+
+struct bt_stream_base_data {
+	struct queue *ltv_caps;
+	struct queue *ltv_meta;
+	struct bt_bap_stream *stream;
+};
+
+struct bt_base_data_subgroup {
+	uint8_t subgroup_index;
+	struct bt_bap_codec codec;
+	struct queue *ltv_caps;
+	struct queue *ltv_meta;
+	struct queue *bises;
+};
+
+struct bt_base_data_bis {
+	uint8_t bis_index;
+	struct queue *ltv_caps;
+};
+
 /* Contains local bt_bap_db */
 static struct queue *bap_db;
 static struct queue *bap_cbs;
@@ -826,6 +851,7 @@ static struct bt_bap_stream *bap_stream_new(struct bt_bap *bap,
 	stream->rpac = rpac;
 	stream->cc = util_iov_dup(data, 1);
 	stream->client = client;
+	stream->bcast_links = queue_new();
 
 	queue_push_tail(bap->streams, stream);
 
@@ -1010,6 +1036,14 @@ static void stream_io_unref(struct bt_bap_stream_io *io)
 	stream_io_free(io);
 }
 
+static void bap_stream_unlink(void *data, void *user_data)
+{
+	struct bt_bap_stream *link = data;
+	struct bt_bap_stream *stream = user_data;
+
+	queue_remove(link->bcast_links, stream);
+}
+
 static void bap_stream_free(void *data)
 {
 	struct bt_bap_stream *stream = data;
@@ -1020,6 +1054,9 @@ static void bap_stream_free(void *data)
 	if (stream->link)
 		stream->link->link = NULL;
 
+	queue_foreach(stream->bcast_links, bap_stream_unlink, stream);
+	queue_destroy(stream->bcast_links, NULL);
+
 	stream_io_unref(stream->io);
 	util_iov_free(stream->cc, 1);
 	util_iov_free(stream->meta, 1);
@@ -5492,3 +5529,458 @@ void bt_bap_update_bcast_source(struct bt_bap_pac *pac,
 	bap_pac_merge(pac, data, metadata);
 	pac->codec = *codec;
 }
+
+static void destroy_ltv(void *data)
+{
+	struct bt_ltv *ltv = data;
+
+	if (!ltv)
+		return;
+
+	free(ltv);
+}
+
+static void destroy_base_data_bis(void *data)
+{
+	struct bt_base_data_bis *bis = data;
+
+	if (!bis)
+		return;
+
+	queue_destroy(bis->ltv_caps, destroy_ltv);
+	free(bis);
+}
+
+static void destroy_base_data_subgroup(void *data)
+{
+	struct bt_base_data_subgroup *subgroup = data;
+
+	if (!subgroup)
+		return;
+
+	queue_destroy(subgroup->ltv_caps, destroy_ltv);
+	queue_destroy(subgroup->ltv_meta, destroy_ltv);
+	queue_destroy(subgroup->bises, destroy_base_data_bis);
+
+	free(subgroup);
+}
+
+static void destroy_stream_base_data(void *data)
+{
+	struct bt_stream_base_data *sbd = data;
+
+	if (!sbd)
+		return;
+
+	queue_destroy(sbd->ltv_caps, destroy_ltv);
+	queue_destroy(sbd->ltv_meta, destroy_ltv);
+	sbd->stream = NULL;
+	free(sbd);
+}
+
+static void append_ltv_to_base(void *data, void *user_data)
+{
+	struct bt_ltv *ltv = data;
+	struct iovec *base_iov = user_data;
+
+	if (!util_iov_push_u8(base_iov, ltv->len))
+		return;
+
+	if (!util_iov_push_u8(base_iov, ltv->type))
+		return;
+
+	if (!util_iov_push_mem(base_iov, ltv->len - 1, ltv->value))
+		return;
+}
+
+static void get_ltv_size(void *data, void *user_data)
+{
+	struct bt_ltv *ltv = data;
+	uint8_t *length = user_data;
+
+	*length = *length + ltv->len + 1;
+}
+
+static uint8_t get_size_from_ltv_queue(struct queue *ltv_queue)
+{
+	uint8_t length = 0;
+
+	queue_foreach(ltv_queue, get_ltv_size, &length);
+	return length;
+}
+
+static void generate_bis_base(void *data, void *user_data)
+{
+	struct bt_base_data_bis *bis = data;
+	struct iovec *base_iov = user_data;
+	uint8_t cc_length = get_size_from_ltv_queue(bis->ltv_caps);
+
+	if (!util_iov_push_u8(base_iov, bis->bis_index))
+		return;
+
+	if (!util_iov_push_u8(base_iov, cc_length))
+		return;
+
+	queue_foreach(bis->ltv_caps, append_ltv_to_base, base_iov);
+}
+
+static void generate_subgroup_base(void *data, void *user_data)
+{
+	struct bt_base_data_subgroup *bds = data;
+	struct iovec *base_iov = user_data;
+	uint8_t cc_length = get_size_from_ltv_queue(bds->ltv_caps);
+	uint8_t metadata_length = get_size_from_ltv_queue(bds->ltv_meta);
+
+	if (!util_iov_push_u8(base_iov, queue_length(bds->bises)))
+		return;
+
+	if (!util_iov_push_u8(base_iov, bds->codec.id))
+		return;
+
+	if (!util_iov_push_le16(base_iov, bds->codec.cid))
+		return;
+
+	if (!util_iov_push_le16(base_iov, bds->codec.vid))
+		return;
+
+	if (!util_iov_push_u8(base_iov, cc_length))
+		return;
+
+	queue_foreach(bds->ltv_caps, append_ltv_to_base, base_iov);
+
+	if (!util_iov_push_u8(base_iov, metadata_length))
+		return;
+
+	queue_foreach(bds->ltv_meta, append_ltv_to_base, base_iov);
+
+	queue_foreach(bds->bises, generate_bis_base, base_iov);
+}
+
+static struct iovec *generate_base(struct bt_base_data *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->base_data_subgroup)))
+		return NULL;
+
+	queue_foreach(base->base_data_subgroup, generate_subgroup_base,
+				base_iov);
+
+	return base_iov;
+}
+
+static void get_max_bises_index(void *data, void *user_data)
+{
+	struct bt_base_data_bis *bdb = data;
+	uint8_t *bis_index = user_data;
+
+	if (bdb->bis_index > *bis_index)
+		*bis_index = bdb->bis_index + 1;
+	else if (bdb->bis_index == *bis_index)
+		*bis_index = *bis_index + 1;
+}
+
+static void get_bises_index(void *data, void *user_data)
+{
+	struct bt_base_data_subgroup *bds = data;
+	uint8_t *bis_index = user_data;
+
+	queue_foreach(bds->bises, get_max_bises_index, bis_index);
+}
+
+static uint8_t get_bis_index(struct queue *subgroups)
+{
+	uint8_t bis_index = 1;
+
+	queue_foreach(subgroups, get_bises_index, &bis_index);
+	return bis_index;
+}
+
+static void add_new_bis(struct bt_base_data_subgroup *subgroup,
+			uint8_t bis_index, struct queue *ltv_bis_caps)
+{
+		struct bt_base_data_bis *bdb = new0(struct bt_base_data_bis, 1);
+
+		bdb->bis_index = bis_index;
+		bdb->ltv_caps = ltv_bis_caps;
+		queue_push_tail(subgroup->bises, bdb);
+}
+
+static void add_new_subgroup(struct queue *subgroups,
+			struct bt_stream_base_data *base_data)
+{
+		struct bt_bap_pac *lpac = base_data->stream->lpac;
+		struct bt_base_data_subgroup *bds = new0(
+					struct bt_base_data_subgroup, 1);
+		uint16_t cid = 0;
+		uint16_t vid = 0;
+
+		bt_bap_pac_get_vendor_codec(lpac, &bds->codec.id, &cid,
+				&vid, NULL, NULL);
+		bds->codec.cid = cid;
+		bds->codec.vid = vid;
+		bds->ltv_caps = base_data->ltv_caps;
+		bds->ltv_meta = base_data->ltv_meta;
+		base_data->ltv_caps = NULL;
+		base_data->ltv_meta = NULL;
+		bds->bises = queue_new();
+		base_data->stream->qos.bcast.bis = get_bis_index(subgroups);
+		add_new_bis(bds, base_data->stream->qos.bcast.bis,
+						queue_new());
+		queue_push_tail(subgroups, bds);
+}
+
+static bool ltv_match(const void *data, const void *match_data)
+{
+	const struct bt_ltv *ltv1 = data;
+	const struct bt_ltv *ltv2 = match_data;
+
+	if (ltv1->len == ltv2->len)
+		if (ltv1->type == ltv2->type)
+			if (memcmp(ltv1->value, ltv2->value, ltv1->len - 1)
+						== 0)
+				return true;
+	return false;
+}
+
+
+static bool compare_ltv_lists(struct queue *ltv_list1, struct queue *ltv_list2)
+{
+	const struct queue_entry *entry;
+	/* Compare metadata length */
+	if (queue_length(ltv_list1) != queue_length(ltv_list2))
+		return false;
+
+	/* Compare metadata ltvs */
+	for (entry = queue_get_entries(ltv_list1); entry; entry = entry->next) {
+		struct bt_ltv *ltv = entry->data;
+
+		if (!queue_find(ltv_list2, ltv_match, ltv))
+			return false;
+	}
+
+	return true;
+}
+
+static struct queue *compare_caps_ltv_lists(
+		struct queue *subgroup_caps, struct queue *bis_caps)
+{
+	struct queue *ltv_caps = queue_new();
+	const struct queue_entry *entry;
+
+	/* Compare metadata ltvs */
+	for (entry = queue_get_entries(bis_caps); entry;
+					entry = entry->next) {
+		struct bt_ltv *ltv = entry->data;
+
+		if (!queue_find(subgroup_caps, ltv_match, ltv))
+			queue_push_tail(ltv_caps, ltv);
+	}
+
+	if (queue_isempty(ltv_caps)) {
+		queue_destroy(ltv_caps, NULL);
+		return NULL;
+	} else
+		return ltv_caps;
+}
+
+static void remove_ltv_form_list(void *data, void *user_data)
+{
+	struct bt_ltv *ltv = data;
+	struct queue *ltv_caps = user_data;
+
+	queue_remove(ltv_caps, ltv);
+}
+
+static void set_base_subgroup(void *data, void *user_data)
+{
+	struct bt_stream_base_data *stream_base = data;
+	struct bt_base_data *base = user_data;
+	struct queue *ltv_caps;
+
+	if (queue_isempty(base->base_data_subgroup)) {
+		add_new_subgroup(base->base_data_subgroup, stream_base);
+	} else {
+		/* Verify if a subgroup has the same metadata */
+		const struct queue_entry *entry;
+		struct bt_base_data_subgroup *subgroup_base = NULL;
+		bool same_meta = false;
+
+		for (entry = queue_get_entries(base->base_data_subgroup);
+						entry; entry = entry->next) {
+			subgroup_base = entry->data;
+			if (compare_ltv_lists(subgroup_base->ltv_meta,
+					stream_base->ltv_meta)) {
+				same_meta = true;
+				break;
+			}
+		}
+
+		if (!same_meta) {
+			/* No subgroup with the same metadata found.
+			 * Create a new one.
+			 */
+			add_new_subgroup(base->base_data_subgroup,
+				stream_base);
+		} else {
+			/* Subgroup found with the same metadata
+			 * get different capabilities
+			 */
+			ltv_caps = compare_caps_ltv_lists(
+					subgroup_base->ltv_caps,
+					stream_base->ltv_caps);
+
+			queue_foreach(ltv_caps, remove_ltv_form_list,
+				stream_base->ltv_caps);
+			stream_base->stream->qos.bcast.bis = get_bis_index(
+				base->base_data_subgroup);
+			add_new_bis(subgroup_base,
+					stream_base->stream->qos.bcast.bis,
+					ltv_caps);
+		}
+	}
+}
+
+static void set_device_presentation_delay(void *data, void *user_data)
+{
+	struct bt_stream_base_data *sbd = data;
+	struct bt_base_data *base = user_data;
+	struct bt_bap_qos *qos = &sbd->stream->qos;
+
+	if (base->pres_delay < qos->bcast.delay)
+		base->pres_delay = qos->bcast.delay;
+}
+
+static void parse_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v,
+					void *user_data)
+{
+	struct queue **ltv_queue = user_data;
+	struct bt_ltv *q_ltv_elem = malloc(sizeof(struct bt_ltv) + l);
+
+	q_ltv_elem->len = l + 1;
+	q_ltv_elem->type = t;
+
+	memcpy(q_ltv_elem->value, v, l);
+
+	if (!*ltv_queue)
+		*ltv_queue = queue_new();
+	queue_push_tail(*ltv_queue, q_ltv_elem);
+}
+
+/*
+ * Extract Codec Specific configurations and Metadata information
+ * that will be use in the BASE creation
+ */
+static struct bt_stream_base_data *get_stream_base_info(
+			struct bt_bap_stream *stream)
+{
+	struct bt_stream_base_data *sbd = new0(struct bt_stream_base_data, 1);
+	struct iovec *stream_caps_iov = util_iov_dup(
+			stream->cc, 1);
+	struct iovec *stream_meta_iov = util_iov_dup(
+			stream->meta, 1);
+
+	/*
+	 * Copy the Codec Specific configurations from stream
+	 */
+	if (stream_caps_iov != NULL) {
+		if (!util_ltv_foreach(stream_caps_iov->iov_base,
+				stream_caps_iov->iov_len, NULL,
+				parse_ltv, &sbd->ltv_caps)) {
+			DBG(stream->bap,
+			"Unable to parse Codec Specific configurations");
+			goto fail;
+		}
+	}
+
+	/*
+	 * Copy the Metadata from stream
+	 */
+	if (stream_meta_iov != NULL) {
+		if (!util_ltv_foreach(stream_meta_iov->iov_base,
+				stream_meta_iov->iov_len, NULL,
+				parse_ltv, &sbd->ltv_meta)) {
+			DBG(stream->bap,
+			"Unable to parse metadata");
+			goto fail;
+		}
+	}
+
+	sbd->stream = stream;
+
+	util_iov_free(stream_caps_iov, 1);
+	util_iov_free(stream_meta_iov, 1);
+
+	return sbd;
+
+fail:
+	util_iov_free(stream_caps_iov, 1);
+	util_iov_free(stream_meta_iov, 1);
+
+	if (sbd->ltv_caps)
+		queue_destroy(sbd->ltv_caps, destroy_ltv);
+
+	if (sbd->ltv_meta)
+		queue_destroy(sbd->ltv_meta, destroy_ltv);
+
+	free(sbd);
+
+	return NULL;
+}
+
+static void get_stream_base_data(void *data, void *user_data)
+{
+	struct bt_bap_stream *stream = data;
+	struct queue *streams_base_data = user_data;
+	struct bt_stream_base_data *sbd = get_stream_base_info(stream);
+
+	if (sbd)
+		queue_push_tail(streams_base_data, sbd);
+}
+
+/*
+ * Function to update the BASE using configuration data
+ * from each BIS in an BIG
+ */
+struct iovec *bt_bap_update_base(struct bt_bap_stream *stream)
+{
+	struct bt_base_data *base;
+	struct iovec *base_iov;
+	struct queue *streams_base_data = queue_new();
+	struct bt_stream_base_data *sbd = get_stream_base_info(stream);
+
+	/*
+	 * Extract Codec Specific configurations and Metadata information
+	 * that will be use in the BASE creation from all linked BISes
+	 */
+	queue_foreach(stream->bcast_links, get_stream_base_data,
+						streams_base_data);
+
+	queue_push_tail(streams_base_data, sbd);
+
+	base = new0(struct bt_base_data, 1);
+	base->base_data_subgroup = queue_new();
+
+	queue_foreach(streams_base_data, set_device_presentation_delay, base);
+
+	/*
+	 * Create subgroups and BISes in a BASE
+	 */
+	queue_foreach(streams_base_data, set_base_subgroup, base);
+
+	base_iov = generate_base(base);
+
+	queue_destroy(streams_base_data, destroy_stream_base_data);
+
+	queue_destroy(base->base_data_subgroup, destroy_base_data_subgroup);
+
+	free(base);
+
+	return base_iov;
+}
diff --git a/src/shared/bap.h b/src/shared/bap.h
index 51edc08ab..725151fa5 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_update_base(struct bt_bap_stream *stream);
-- 
2.39.2