Bluetooth: Audio: Implement CAP unicast audio start

Implement the CAP unicast start procedure, which
will put one or more CAP streams from the idle state
to the streaming state, across or more ACL connections.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

include/zephyr/bluetooth/audio/cap.h

@@ -139,7 +139,7 @@ union bt_cap_set_member {
 	struct bt_conn *member;
 
 	/** CSIP Coordinated Set struct used if type is BT_CAP_SET_TYPE_CSIP. */
-	struct bt_csip_set_coordinator_set_member *csip;
+	struct bt_csip_set_coordinator_csis_inst *csip;
 };
 
 struct bt_cap_stream {
@@ -156,22 +156,15 @@ struct bt_cap_stream {
  */
 void bt_cap_stream_ops_register(struct bt_cap_stream *stream, struct bt_bap_stream_ops *ops);
 
-struct bt_cap_unicast_audio_start_param {
-	/** The type of the set. */
-	enum bt_cap_set_type type;
+struct bt_cap_unicast_audio_start_stream_param {
+	/** Coordinated or ad-hoc set member. */
+	union bt_cap_set_member member;
 
-	/** The number of set members in @p members and number of streams in @p streams. */
-	size_t count;
+	/** @brief Stream for the @p member */
+	struct bt_cap_stream *stream;
 
-	/** Coordinated or ad-hoc set members. */
-	union bt_cap_set_member **members;
-
-	/** @brief Streams for the @p members
-	 *
-	 * stream[i] will be associated with members[i] if not already
-	 * initialized, else the stream will be verified against the member.
-	 */
-	struct bt_cap_stream **streams;
+	/** Endpoint reference for the @p stream */
+	struct bt_bap_ep *ep;
 
 	/**
 	 * @brief Codec configuration.
@@ -180,10 +173,30 @@ struct bt_cap_unicast_audio_start_param {
 	 * (@ref BT_AUDIO_METADATA_TYPE_CCID_LIST) as well as a non-0
 	 * stream context (@ref BT_AUDIO_METADATA_TYPE_STREAM_CONTEXT) bitfield.
 	 */
-	const struct bt_codec *codec;
+	struct bt_codec *codec;
 
 	/** Quality of Service configuration. */
-	const struct bt_codec_qos *qos;
+	struct bt_codec_qos *qos;
+};
+
+struct bt_cap_unicast_audio_start_param {
+	/** The type of the set. */
+	enum bt_cap_set_type type;
+
+	/** The number of parameters in @p stream_params */
+	size_t count;
+
+	/** Array of stream parameters */
+	struct bt_cap_unicast_audio_start_stream_param *stream_params;
+
+	/** @brief Unicast Group packing mode.
+	 *
+	 *  @ref BT_ISO_PACKING_SEQUENTIAL or @ref BT_ISO_PACKING_INTERLEAVED.
+	 *
+	 *  @note This is a recommendation to the controller, which the
+	 *  controller may ignore.
+	 */
+	uint8_t packing;
 };
 
 /**
@@ -207,12 +220,12 @@ int bt_cap_initiator_register_cb(const struct bt_cap_initiator_cb *cb);
  * to be enabled.
  *
  * @param[in]  param          Parameters to start the audio streams.
- * @param[out] unicast_group  Pointer to the unicast group created.
+ * @param[out] unicast_group  Pointer to the unicast group.
  *
  * @return 0 on success or negative error value on failure.
  */
 int bt_cap_initiator_unicast_audio_start(const struct bt_cap_unicast_audio_start_param *param,
-					 struct bt_bap_unicast_group **unicast_group);
+					 struct bt_bap_unicast_group *unicast_group);
 
 /**
  * @brief Update unicast audio streams for a unicast group.

subsys/bluetooth/audio/Kconfig.cap

@@ -46,6 +46,11 @@ config BT_CAP_INITIATOR
 	help
 	  Enabling this will enable the CAP Initiator role.
 
+module = BT_CAP_INITIATOR
+legacy-debug-sym = BT_DEBUG_CAP_INITIATOR
+module-str = "Common Audio Profile Initiator"
+source "subsys/bluetooth/common/Kconfig.template.log_config_bt"
+
 config BT_DEBUG_CAP_INITIATOR
 	bool "Common Audio Profile Initiator debug"
 	select DEPRECATED