[PATCH 1/4] monitor: Add AVRCP GetFolderItems Support

[Bharat Panda <bharat.panda@xxxxxxxxxxx>]

Support for decoding AVRCP GetFolderItems added in btmon.

      Channel: 65 len 20 ctrl 0x0000 [PSM 27 mode 3] {chan 1}
      I-frame: Unsegmented TxSeq 0 ReqSeq 0
      AVCTP Browsing: Command: type 0x00 label 0 PID 0x110e
        AVRCP: GetFolderItems: len 0x000a
          Scope: 0x01 (Media Player Virtual Filesystem)
          StartItem: 0x00000000 (0)
          EndItem: 0x0000000a (10)
          AttributeCount: 0xff (255)
          AttributeID: 0x0000326e (Reserved)
---
 monitor/avctp.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 111 insertions(+), 2 deletions(-)

diff --git a/monitor/avctp.c b/monitor/avctp.c
index c599aa4..a55cb41 100644
--- a/monitor/avctp.c
+++ b/monitor/avctp.c
@@ -182,6 +182,11 @@
 #define AVRCP_MEDIA_SEARCH		0x02
 #define AVRCP_MEDIA_NOW_PLAYING		0x03
 
+/* Media Item Type */
+#define AVRCP_MEDIA_PLAYER_ITEM_TYPE	0x01
+#define AVRCP_FOLDER_ITEM_TYPE			0x02
+#define AVRCP_MEDIA_ELEMENT_ITEM_TYPE	0x03
+
 /* operands in passthrough commands */
 #define AVC_PANEL_VOLUME_UP		0x41
 #define AVC_PANEL_VOLUME_DOWN		0x42
@@ -677,6 +682,20 @@ static char *op2str(uint8_t op)
 	}
 }
 
+static const char *type2str(uint8_t type)
+{
+	switch (type) {
+	case AVRCP_MEDIA_PLAYER_ITEM_TYPE:
+		return "Media Player";
+	case AVRCP_FOLDER_ITEM_TYPE:
+		return "Folder";
+	case AVRCP_MEDIA_ELEMENT_ITEM_TYPE:
+		return "Media Element";
+	default:
+		return "Unknown";
+	}
+}
+
 static bool avrcp_passthrough_packet(struct avctp_frame *avctp_frame,
 								uint8_t indent)
 {
@@ -1096,10 +1115,10 @@ static bool avrcp_get_element_attributes(struct avctp_frame *avctp_frame,
 	for (; num > 0; num--) {
 		uint32_t attr;
 
-		if (!l2cap_frame_get_be32(frame, &attr))
+		if (!l2cap_frame_get_le32(frame, &attr))
 			return false;
 
-		print_field("%*cAttribute: 0x%08x (%s)", (indent - 8),
+		print_field("%*cAttributeID: 0x%08x (%s)", (indent - 8),
 					' ', attr, mediattr2str(attr));
 	}
 
@@ -1637,6 +1656,93 @@ static bool avrcp_control_packet(struct avctp_frame *avctp_frame)
 	}
 }
 
+static bool avrcp_get_folder_items(struct avctp_frame *avctp_frame)
+{
+	struct l2cap_frame *frame = &avctp_frame->l2cap_frame;
+	uint8_t scope, count, status, indent = 2;
+	uint32_t start, end;
+	uint16_t uid, num;
+
+	if (avctp_frame->hdr & 0x02)
+		goto response;
+
+	if (!l2cap_frame_get_u8(frame, &scope))
+		return false;
+
+	print_field("%*cScope: 0x%02x (%s)", indent, ' ',
+					scope, scope2str(scope));
+
+	if (!l2cap_frame_get_be32(frame, &start))
+		return false;
+
+	print_field("%*cStartItem: 0x%08x (%u)", indent, ' ', start, start);
+
+	if (!l2cap_frame_get_be32(frame, &end))
+		return false;
+
+	print_field("%*cEndItem: 0x%08x (%u)", indent, ' ', end, end);
+
+	if (!l2cap_frame_get_u8(frame, &count))
+		return false;
+
+	print_field("%*cAttributeCount: 0x%02x (%u)", indent, ' ',
+						count, count);
+
+	for (; count > 0; count--) {
+		uint16_t attr;
+
+		if (!l2cap_frame_get_be16(frame, &attr)) {
+			return false;
+		}
+
+		print_field("%*cAttributeID: 0x%08x (%s)", indent, ' ',
+					attr, mediattr2str(attr));
+	}
+
+	return false;
+
+response:
+	if (!l2cap_frame_get_u8(frame, &status))
+		return false;
+
+	print_field("%*cStatus: 0x%02x (%s)", indent, ' ',
+				status, error2str(status));
+
+	if (!l2cap_frame_get_be16(frame, &uid))
+		return false;
+
+	print_field("%*cUIDCounter: 0x%04x (%u)", indent, ' ', uid, uid);
+
+	if (!l2cap_frame_get_be16(frame, &num))
+		return false;
+
+	print_field("%*cUIDCounter: 0x%04x (%u)", indent, ' ', num, num);
+
+	for (; num > 0; num--) {
+		uint8_t type;
+		uint16_t len;
+
+		if (!l2cap_frame_get_u8(frame, &type))
+			return false;
+
+		if (!l2cap_frame_get_be16(frame, &len))
+			return false;
+
+		print_field("%*cItem: 0x%02x (%s) ", indent, ' ',
+					type, type2str(type));
+		print_field("%*cLength: 0x%04x (%u)", indent, ' ', len, len);
+
+		switch (type) {
+		case AVRCP_MEDIA_PLAYER_ITEM_TYPE:
+		case AVRCP_FOLDER_ITEM_TYPE:
+		case AVRCP_MEDIA_ELEMENT_ITEM_TYPE:
+			packet_hexdump(frame->data, frame->size);
+			break;
+		}
+	}
+	return true;
+}
+
 static bool avrcp_set_browsed_player(struct avctp_frame *avctp_frame)
 {
 	struct l2cap_frame *frame = &avctp_frame->l2cap_frame;
@@ -1722,6 +1828,9 @@ static bool avrcp_browsing_packet(struct avctp_frame *avctp_frame)
 	case AVRCP_SET_BROWSED_PLAYER:
 		avrcp_set_browsed_player(avctp_frame);
 		break;
+	case AVRCP_GET_FOLDER_ITEMS:
+		avrcp_get_folder_items(avctp_frame);
+		break;
 	default:
 		packet_hexdump(frame->data, frame->size);
 	}
-- 
1.9.1

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