1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "avrcp_browsing_target.c" 39 40 #include <stdint.h> 41 #include <string.h> 42 #include <inttypes.h> 43 #include "btstack.h" 44 #include "classic/avrcp_browsing.h" 45 #include "classic/avrcp_browsing_target.h" 46 47 static void avrcp_browsing_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 48 49 static int avrcp_browsing_target_handle_can_send_now(avrcp_browsing_connection_t * connection){ 50 int pos = 0; 51 52 // l2cap_reserve_packet_buffer(); 53 // uint8_t * packet = l2cap_get_outgoing_buffer(); 54 uint8_t packet[300]; 55 connection->packet_type = AVRCP_SINGLE_PACKET; 56 57 packet[pos++] = (connection->transaction_label << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 58 // Profile IDentifier (PID) 59 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 60 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 61 (void)memcpy(packet + pos, connection->cmd_operands, 62 connection->cmd_operands_length); 63 64 pos += connection->cmd_operands_length; 65 connection->wait_to_send = false; 66 // return l2cap_send_prepared(connection->l2cap_browsing_cid, pos); 67 return l2cap_send(connection->l2cap_browsing_cid, packet, pos); 68 } 69 70 71 static uint8_t avrcp_browsing_target_response_general_reject(avrcp_browsing_connection_t * connection, avrcp_status_code_t status){ 72 // AVRCP_CTYPE_RESPONSE_REJECTED 73 int pos = 0; 74 connection->cmd_operands[pos++] = AVRCP_PDU_ID_GENERAL_REJECT; 75 // connection->cmd_operands[pos++] = 0; 76 // param length 77 big_endian_store_16(connection->cmd_operands, pos, 1); 78 pos += 2; 79 connection->cmd_operands[pos++] = status; 80 connection->cmd_operands_length = 4; 81 connection->state = AVCTP_W2_SEND_RESPONSE; 82 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 83 return ERROR_CODE_SUCCESS; 84 } 85 86 static void avrcp_browsing_target_emit_get_folder_items(btstack_packet_handler_t callback, uint16_t browsing_cid, avrcp_browsing_connection_t * connection){ 87 btstack_assert(callback != NULL); 88 89 uint8_t event[10]; 90 int pos = 0; 91 event[pos++] = HCI_EVENT_AVRCP_META; 92 event[pos++] = sizeof(event) - 2; 93 event[pos++] = AVRCP_SUBEVENT_BROWSING_GET_FOLDER_ITEMS; 94 little_endian_store_16(event, pos, browsing_cid); 95 pos += 2; 96 event[pos++] = connection->scope; 97 big_endian_store_32(event, pos, connection->attr_bitmap); 98 pos += 4; 99 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 100 } 101 102 static void avrcp_browsing_target_emit_get_total_num_items(btstack_packet_handler_t callback, uint16_t browsing_cid, avrcp_browsing_connection_t * connection){ 103 btstack_assert(callback != NULL); 104 105 uint8_t event[10]; 106 int pos = 0; 107 event[pos++] = HCI_EVENT_AVRCP_META; 108 event[pos++] = sizeof(event) - 2; 109 event[pos++] = AVRCP_SUBEVENT_BROWSING_GET_TOTAL_NUM_ITEMS; 110 little_endian_store_16(event, pos, browsing_cid); 111 pos += 2; 112 event[pos++] = connection->scope; 113 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 114 } 115 116 117 static void avrcp_browsing_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 118 UNUSED(size); 119 avrcp_browsing_connection_t * browsing_connection; 120 121 switch (packet_type) { 122 case L2CAP_DATA_PACKET:{ 123 browsing_connection = avrcp_get_browsing_connection_for_l2cap_cid_for_role(AVRCP_TARGET, channel); 124 if (!browsing_connection) break; 125 int pos = 0; 126 uint8_t transport_header = packet[pos++]; 127 // Transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 128 browsing_connection->transaction_label = transport_header >> 4; 129 avrcp_packet_type_t avctp_packet_type = (transport_header & 0x0F) >> 2; 130 switch (avctp_packet_type){ 131 case AVRCP_SINGLE_PACKET: 132 case AVRCP_START_PACKET: 133 browsing_connection->subunit_type = packet[pos++] >> 2; 134 browsing_connection->subunit_id = 0; 135 browsing_connection->command_opcode = packet[pos++]; 136 browsing_connection->num_packets = 1; 137 if (avctp_packet_type == AVRCP_START_PACKET){ 138 browsing_connection->num_packets = packet[pos++]; 139 } 140 browsing_connection->pdu_id = packet[pos++]; 141 break; 142 default: 143 break; 144 } 145 switch (avctp_packet_type){ 146 case AVRCP_SINGLE_PACKET: 147 case AVRCP_END_PACKET: 148 switch(browsing_connection->pdu_id){ 149 case AVRCP_PDU_ID_GET_FOLDER_ITEMS: 150 browsing_connection->scope = packet[pos++]; 151 browsing_connection->start_item = big_endian_read_32(packet, pos); 152 pos += 4; 153 browsing_connection->end_item = big_endian_read_32(packet, pos); 154 pos += 4; 155 uint8_t attr_count = packet[pos++]; 156 157 while (attr_count){ 158 uint32_t attr_id = big_endian_read_32(packet, pos); 159 pos += 4; 160 browsing_connection->attr_bitmap |= (1 << attr_id); 161 attr_count--; 162 } 163 avrcp_browsing_target_emit_get_folder_items(avrcp_target_context.browsing_avrcp_callback, channel, browsing_connection); 164 break; 165 case AVRCP_PDU_ID_GET_TOTAL_NUMBER_OF_ITEMS:{ 166 // send total num items 167 browsing_connection->scope = packet[pos++]; 168 avrcp_browsing_target_emit_get_total_num_items(avrcp_target_context.browsing_avrcp_callback, channel, browsing_connection); 169 break; 170 } 171 default: 172 avrcp_browsing_target_response_general_reject(browsing_connection, AVRCP_STATUS_INVALID_COMMAND); 173 log_info("not parsed pdu ID 0x%02x", browsing_connection->pdu_id); 174 break; 175 } 176 browsing_connection->state = AVCTP_CONNECTION_OPENED; 177 break; 178 default: 179 break; 180 } 181 break; 182 } 183 184 case HCI_EVENT_PACKET: 185 switch (hci_event_packet_get_type(packet)){ 186 case L2CAP_EVENT_CAN_SEND_NOW: 187 browsing_connection = avrcp_get_browsing_connection_for_l2cap_cid_for_role(AVRCP_TARGET, channel); 188 if (browsing_connection->state != AVCTP_W2_SEND_RESPONSE) return; 189 browsing_connection->state = AVCTP_CONNECTION_OPENED; 190 avrcp_browsing_target_handle_can_send_now(browsing_connection); 191 break; 192 default: 193 break; 194 } 195 break; 196 197 default: 198 break; 199 } 200 } 201 202 void avrcp_browsing_target_init(void){ 203 avrcp_target_context.browsing_packet_handler = avrcp_browsing_target_packet_handler; 204 avrcp_browsing_register_target_packet_handler(avrcp_browsing_target_packet_handler); 205 } 206 207 void avrcp_browsing_target_register_packet_handler(btstack_packet_handler_t callback){ 208 btstack_assert(callback != NULL); 209 avrcp_target_context.browsing_avrcp_callback = callback; 210 } 211 212 uint8_t avrcp_browsing_target_send_get_folder_items_response(uint16_t avrcp_browsing_cid, uint16_t uid_counter, uint8_t * attr_list, uint16_t attr_list_size){ 213 avrcp_connection_t * avrcp_connection = avrcp_get_connection_for_browsing_cid_for_role(AVRCP_TARGET, avrcp_browsing_cid); 214 if (!avrcp_connection){ 215 log_error("Could not find an AVRCP Target connection for browsing_cid 0x%02x.", avrcp_browsing_cid); 216 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 217 } 218 219 avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; 220 if (!connection){ 221 log_info("Could not find a browsing connection."); 222 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 223 } 224 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 225 226 // TODO: handle response to SetAddressedPlayer 227 228 uint16_t pos = 0; 229 connection->cmd_operands[pos++] = AVRCP_PDU_ID_GET_FOLDER_ITEMS; 230 big_endian_store_16(connection->cmd_operands, pos, attr_list_size); 231 pos += 2; 232 233 connection->cmd_operands[pos++] = AVRCP_STATUS_SUCCESS; 234 big_endian_store_16(connection->cmd_operands, pos, uid_counter); 235 pos += 2; 236 237 // TODO: fragmentation 238 if (attr_list_size > sizeof(connection->cmd_operands)){ 239 connection->attr_list = attr_list; 240 connection->attr_list_size = attr_list_size; 241 log_info(" todo: list too big, invoke fragmentation"); 242 return 1; 243 } 244 (void)memcpy(&connection->cmd_operands[pos], attr_list, attr_list_size); 245 pos += attr_list_size; 246 connection->cmd_operands_length = pos; 247 248 connection->state = AVCTP_W2_SEND_RESPONSE; 249 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 250 return ERROR_CODE_SUCCESS; 251 } 252 253 254 uint8_t avrcp_browsing_target_send_get_total_num_items_response(uint16_t avrcp_browsing_cid, uint16_t uid_counter, uint32_t total_num_items){ 255 avrcp_connection_t * avrcp_connection = avrcp_get_connection_for_browsing_cid_for_role(AVRCP_TARGET, avrcp_browsing_cid); 256 if (!avrcp_connection){ 257 log_error("Could not find an AVRCP Target connection for browsing_cid 0x%02x.", avrcp_browsing_cid); 258 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 259 } 260 261 avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; 262 if (!connection){ 263 log_info("Could not find a browsing connection."); 264 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 265 } 266 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 267 268 if (connection->state != AVCTP_CONNECTION_OPENED) { 269 log_info("Browsing connection wrong state."); 270 return ERROR_CODE_COMMAND_DISALLOWED; 271 } 272 273 int pos = 0; 274 connection->cmd_operands[pos++] = AVRCP_PDU_ID_GET_TOTAL_NUMBER_OF_ITEMS; 275 big_endian_store_16(connection->cmd_operands, pos, 7); 276 pos += 2; 277 connection->cmd_operands[pos++] = AVRCP_STATUS_SUCCESS; 278 big_endian_store_16(connection->cmd_operands, pos, uid_counter); 279 pos += 2; 280 big_endian_store_32(connection->cmd_operands, pos, total_num_items); 281 pos += 4; 282 connection->cmd_operands_length = pos; 283 284 connection->state = AVCTP_W2_SEND_RESPONSE; 285 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 286 return ERROR_CODE_SUCCESS; 287 } 288 289