[PATCH BlueZ v2 1/3] audio/transport: Add volume callback to BAP transport

[Sathish Narasimman <sathish.narasimman@xxxxxxxxx>]

Initialize set_volume and get_volume to BAP transport and update the
volume when media_transport_update_device_volume is called.
---
 profiles/audio/transport.c | 98 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)

diff --git a/profiles/audio/transport.c b/profiles/audio/transport.c
index 41339da51e17..46b936c965bf 100644
--- a/profiles/audio/transport.c
+++ b/profiles/audio/transport.c
@@ -91,6 +91,7 @@ struct bap_transport {
 	uint8_t			rtn;
 	uint16_t		latency;
 	uint32_t		delay;
+	int8_t			volume;
 };
 
 struct media_transport {
@@ -116,6 +117,9 @@ struct media_transport {
 								guint id);
 	void			(*set_state) (struct media_transport *transport,
 						transport_state_t state);
+	void			(*set_vol)(struct media_transport *transport,
+						int8_t volume);
+	int8_t			(*get_vol)(struct media_transport *transport);
 	GDestroyNotify		destroy;
 	void			*data;
 };
@@ -717,6 +721,7 @@ static gboolean volume_exists(const GDBusPropertyTable *property, void *data)
 	return a2dp->volume >= 0;
 }
 
+
 static gboolean get_volume(const GDBusPropertyTable *property,
 					DBusMessageIter *iter, void *data)
 {
@@ -769,6 +774,58 @@ error:
 					"Invalid arguments in method call");
 }
 
+static gboolean volume_bap_exists(const GDBusPropertyTable *property,
+					void *data)
+{
+	struct media_transport *transport = data;
+	struct bap_transport *bap = transport->data;
+
+	return bap->volume >= 0;
+}
+
+static gboolean get_bap_volume(const GDBusPropertyTable *property,
+					DBusMessageIter *iter, void *data)
+{
+	struct media_transport *transport = data;
+	struct bap_transport *bap = transport->data;
+	uint16_t volume = (uint16_t)bap->volume;
+
+	dbus_message_iter_append_basic(iter, DBUS_TYPE_UINT16, &volume);
+
+	return TRUE;
+}
+
+static void set_bap_volume(const GDBusPropertyTable *property,
+			   DBusMessageIter *iter, GDBusPendingPropertySet id,
+			   void *data)
+{
+	struct media_transport *transport = data;
+	struct bap_transport *bap = transport->data;
+	uint16_t arg;
+	int8_t volume;
+
+	if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_UINT16)
+		goto error;
+
+	dbus_message_iter_get_basic(iter, &arg);
+	if (arg > INT8_MAX)
+		goto error;
+
+	g_dbus_pending_property_success(id);
+
+	volume = (int8_t)arg;
+	if (bap->volume == volume)
+		return;
+
+	/*TODO vcp_send_volume */
+	return;
+
+error:
+	g_dbus_pending_property_error(id, ERROR_INTERFACE ".InvalidArguments",
+					"Invalid arguments in method call");
+}
+
+
 static gboolean endpoint_exists(const GDBusPropertyTable *property, void *data)
 {
 	struct media_transport *transport = data;
@@ -970,6 +1027,7 @@ static const GDBusPropertyTable bap_properties[] = {
 	{ "Retransmissions", "y", get_retransmissions },
 	{ "Latency", "q", get_latency },
 	{ "Delay", "u", get_delay },
+	{ "Volume", "q", get_bap_volume, set_bap_volume, volume_bap_exists },
 	{ "Endpoint", "o", get_endpoint, NULL, endpoint_exists },
 	{ "Location", "u", get_location },
 	{ "Metadata", "ay", get_metadata },
@@ -1387,6 +1445,31 @@ static void free_bap(void *data)
 	free(bap);
 }
 
+static void set_volume_bap(struct media_transport *transport, int8_t volume)
+{
+	struct bap_transport *bap = transport->data;
+
+	if (volume < 0)
+		return;
+
+	/* Check if volume really changed */
+	if (bap->volume == volume)
+		return;
+
+	bap->volume = volume;
+
+	g_dbus_emit_property_changed(btd_get_dbus_connection(),
+					transport->path,
+					MEDIA_TRANSPORT_INTERFACE, "Volume");
+}
+
+static int8_t get_volume_bap(struct media_transport *transport)
+{
+	struct bap_transport *bap = transport->data;
+
+	return bap->volume;
+}
+
 static int media_transport_init_bap(struct media_transport *transport,
 							void *stream)
 {
@@ -1403,6 +1486,7 @@ static int media_transport_init_bap(struct media_transport *transport,
 	bap->rtn = qos->rtn;
 	bap->latency = qos->latency;
 	bap->delay = qos->delay;
+	bap->volume = 127;
 	bap->state_id = bt_bap_state_register(bt_bap_stream_get_session(stream),
 						bap_state_changed,
 						bap_connecting,
@@ -1413,6 +1497,8 @@ static int media_transport_init_bap(struct media_transport *transport,
 	transport->suspend = suspend_bap;
 	transport->cancel = cancel_bap;
 	transport->set_state = set_state_bap;
+	transport->set_vol = set_volume_bap;
+	transport->get_vol = get_volume_bap;
 	transport->destroy = free_bap;
 
 	return 0;
@@ -1537,6 +1623,11 @@ int8_t media_transport_get_device_volume(struct btd_device *dev)
 	/* Attempt to locate the transport to get its volume */
 	for (l = transports; l; l = l->next) {
 		struct media_transport *transport = l->data;
+
+		/* Get BAP transport volume */
+		if (transport->get_vol)
+			return transport->get_vol(transport);
+
 		if (transport->device != dev)
 			continue;
 
@@ -1560,6 +1651,13 @@ void media_transport_update_device_volume(struct btd_device *dev,
 	/* Attempt to locate the transport to set its volume */
 	for (l = transports; l; l = l->next) {
 		struct media_transport *transport = l->data;
+
+		/* Set BAP transport volume */
+		if (transport->set_vol) {
+			transport->set_vol(transport, volume);
+			return;
+		}
+
 		if (transport->device != dev)
 			continue;
 
-- 
2.25.1