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 BLUEKITCHEN 24 * GMBH 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 "classic/avrcp.h" 44 #include "classic/avrcp_browsing.h" 45 #include "classic/avrcp_browsing_target.h" 46 #include "classic/avrcp_target.h" 47 #include "classic/avrcp_controller.h" 48 49 #include "bluetooth_sdp.h" 50 #include "btstack_debug.h" 51 #include "btstack_event.h" 52 53 static void avrcp_browsing_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 54 55 static int avrcp_browsing_target_handle_can_send_now(avrcp_browsing_connection_t * connection){ 56 int pos = 0; 57 58 // l2cap_reserve_packet_buffer(); 59 // uint8_t * packet = l2cap_get_outgoing_buffer(); 60 uint8_t packet[400]; 61 connection->packet_type = AVRCP_SINGLE_PACKET; 62 63 packet[pos++] = (connection->transaction_label << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 64 // Profile IDentifier (PID) 65 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 66 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 67 (void)memcpy(packet + pos, connection->cmd_operands, 68 connection->cmd_operands_length); 69 70 pos += connection->cmd_operands_length; 71 connection->wait_to_send = false; 72 // return l2cap_send_prepared(connection->l2cap_browsing_cid, pos); 73 return l2cap_send(connection->l2cap_browsing_cid, packet, pos); 74 } 75 76 77 static uint8_t avrcp_browsing_target_response_general_reject(avrcp_browsing_connection_t * connection, avrcp_status_code_t status){ 78 // AVRCP_CTYPE_RESPONSE_REJECTED 79 int pos = 0; 80 connection->cmd_operands[pos++] = AVRCP_PDU_ID_GENERAL_REJECT; 81 // connection->message_body[pos++] = 0; 82 // param length 83 big_endian_store_16(connection->cmd_operands, pos, 1); 84 pos += 2; 85 connection->cmd_operands[pos++] = status; 86 connection->cmd_operands_length = 4; 87 connection->state = AVCTP_W2_SEND_RESPONSE; 88 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 89 return ERROR_CODE_SUCCESS; 90 } 91 92 static void avrcp_browsing_target_emit_get_folder_items(btstack_packet_handler_t callback, uint16_t browsing_cid, avrcp_browsing_connection_t * connection){ 93 btstack_assert(callback != NULL); 94 95 uint8_t event[18]; 96 int pos = 0; 97 event[pos++] = HCI_EVENT_AVRCP_META; 98 event[pos++] = sizeof(event) - 2; 99 event[pos++] = AVRCP_SUBEVENT_BROWSING_GET_FOLDER_ITEMS; 100 little_endian_store_16(event, pos, browsing_cid); 101 pos += 2; 102 event[pos++] = connection->scope; 103 big_endian_store_32(event, pos, connection->start_item); 104 pos += 4; 105 big_endian_store_32(event, pos, connection->end_item); 106 pos += 4; 107 big_endian_store_32(event, pos, connection->attr_bitmap); 108 pos += 4; 109 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 110 } 111 112 static void avrcp_browsing_target_emit_get_total_num_items(btstack_packet_handler_t callback, uint16_t browsing_cid, avrcp_browsing_connection_t * connection){ 113 btstack_assert(callback != NULL); 114 115 uint8_t event[10]; 116 int pos = 0; 117 event[pos++] = HCI_EVENT_AVRCP_META; 118 event[pos++] = sizeof(event) - 2; 119 event[pos++] = AVRCP_SUBEVENT_BROWSING_GET_TOTAL_NUM_ITEMS; 120 little_endian_store_16(event, pos, browsing_cid); 121 pos += 2; 122 event[pos++] = connection->scope; 123 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 124 } 125 126 static void avrcp_browsing_target_emit_set_browsed_player(btstack_packet_handler_t callback, uint16_t browsing_cid, uint16_t browsed_player_id){ 127 btstack_assert(callback != NULL); 128 129 uint8_t event[10]; 130 int pos = 0; 131 event[pos++] = HCI_EVENT_AVRCP_META; 132 event[pos++] = sizeof(event) - 2; 133 event[pos++] = AVRCP_SUBEVENT_BROWSING_SET_BROWSED_PLAYER; 134 little_endian_store_16(event, pos, browsing_cid); 135 pos += 2; 136 little_endian_store_16(event, pos, browsed_player_id); 137 pos += 2; 138 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 139 } 140 141 142 static void avrcp_browsing_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 143 UNUSED(size); 144 avrcp_browsing_connection_t * browsing_connection; 145 146 switch (packet_type) { 147 case L2CAP_DATA_PACKET:{ 148 browsing_connection = avrcp_get_browsing_connection_for_l2cap_cid_for_role(AVRCP_TARGET, channel); 149 if (!browsing_connection) break; 150 int pos = 0; 151 uint8_t transport_header = packet[pos++]; 152 // Transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 153 browsing_connection->transaction_label = transport_header >> 4; 154 avctp_packet_type_t avctp_packet_type = (avctp_packet_type_t)((transport_header & 0x0F) >> 2); 155 switch (avctp_packet_type){ 156 case AVCTP_SINGLE_PACKET: 157 case AVCTP_START_PACKET: 158 browsing_connection->subunit_type = packet[pos++] >> 2; 159 browsing_connection->subunit_id = 0; 160 browsing_connection->command_opcode = packet[pos++]; 161 browsing_connection->num_packets = 1; 162 if (avctp_packet_type == AVCTP_START_PACKET){ 163 browsing_connection->num_packets = packet[pos++]; 164 } 165 browsing_connection->pdu_id = packet[pos++]; 166 uint16_t parameter_length = big_endian_read_16(packet, pos); 167 pos += 2; 168 169 switch(browsing_connection->pdu_id){ 170 case AVRCP_PDU_ID_GET_FOLDER_ITEMS: 171 if (parameter_length < 10){ 172 avrcp_browsing_target_response_general_reject(browsing_connection, AVRCP_STATUS_INVALID_COMMAND); 173 break; 174 } 175 176 browsing_connection->scope = packet[pos++]; 177 browsing_connection->start_item = big_endian_read_32(packet, pos); 178 pos += 4; 179 browsing_connection->end_item = big_endian_read_32(packet, pos); 180 pos += 4; 181 uint8_t attr_count = packet[pos++]; 182 browsing_connection->attr_bitmap = 0; 183 184 while (attr_count){ 185 uint32_t attr_id = big_endian_read_32(packet, pos); 186 pos += 4; 187 browsing_connection->attr_bitmap |= (1 << attr_id); 188 attr_count--; 189 } 190 avrcp_browsing_target_emit_get_folder_items(avrcp_target_context.browsing_avrcp_callback, channel, browsing_connection); 191 break; 192 case AVRCP_PDU_ID_GET_TOTAL_NUMBER_OF_ITEMS:{ 193 // send total num items 194 if (parameter_length != 1){ 195 avrcp_browsing_target_response_general_reject(browsing_connection, AVRCP_STATUS_INVALID_SCOPE); 196 break; 197 } 198 199 browsing_connection->scope = packet[pos++]; 200 avrcp_browsing_target_emit_get_total_num_items(avrcp_target_context.browsing_avrcp_callback, channel, browsing_connection); 201 break; 202 } 203 case AVRCP_PDU_ID_SET_BROWSED_PLAYER: 204 // player_id (2) 205 if (parameter_length != 2){ 206 avrcp_browsing_target_response_general_reject(browsing_connection, AVRCP_STATUS_INVALID_COMMAND); 207 break; 208 } 209 210 if ( (pos + 2) > size ){ 211 avrcp_browsing_target_response_general_reject(browsing_connection, AVRCP_STATUS_INVALID_PLAYER_ID); 212 break; 213 } 214 215 avrcp_browsing_target_emit_set_browsed_player(avrcp_target_context.browsing_avrcp_callback, channel, big_endian_read_16(packet, pos)); 216 break; 217 default: 218 avrcp_browsing_target_response_general_reject(browsing_connection, AVRCP_STATUS_INVALID_COMMAND); 219 log_info("not parsed pdu ID 0x%02x", browsing_connection->pdu_id); 220 break; 221 } 222 browsing_connection->state = AVCTP_CONNECTION_OPENED; 223 break; 224 default: 225 break; 226 } 227 break; 228 } 229 230 case HCI_EVENT_PACKET: 231 switch (hci_event_packet_get_type(packet)){ 232 case L2CAP_EVENT_CAN_SEND_NOW: 233 browsing_connection = avrcp_get_browsing_connection_for_l2cap_cid_for_role(AVRCP_TARGET, channel); 234 if (browsing_connection->state != AVCTP_W2_SEND_RESPONSE) return; 235 browsing_connection->state = AVCTP_CONNECTION_OPENED; 236 avrcp_browsing_target_handle_can_send_now(browsing_connection); 237 break; 238 default: 239 break; 240 } 241 break; 242 243 default: 244 break; 245 } 246 } 247 248 void avrcp_browsing_target_init(void){ 249 avrcp_target_context.browsing_packet_handler = avrcp_browsing_target_packet_handler; 250 avrcp_browsing_register_target_packet_handler(avrcp_browsing_target_packet_handler); 251 } 252 253 void avrcp_browsing_target_deinit(void){ 254 avrcp_controller_context.browsing_packet_handler = NULL; 255 } 256 257 void avrcp_browsing_target_register_packet_handler(btstack_packet_handler_t callback){ 258 btstack_assert(callback != NULL); 259 avrcp_target_context.browsing_avrcp_callback = callback; 260 } 261 262 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, uint16_t num_items){ 263 avrcp_connection_t * avrcp_connection = avrcp_get_connection_for_browsing_cid_for_role(AVRCP_TARGET, avrcp_browsing_cid); 264 if (!avrcp_connection){ 265 log_error("Could not find an AVRCP Target connection for browsing_cid 0x%02x.", avrcp_browsing_cid); 266 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 267 } 268 269 avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; 270 if (!connection){ 271 log_info("Could not find a browsing connection."); 272 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 273 } 274 if (connection->state != AVCTP_CONNECTION_OPENED){ 275 return ERROR_CODE_COMMAND_DISALLOWED; 276 } 277 278 // TODO: handle response to SetAddressedPlayer 279 280 uint16_t pos = 0; 281 connection->cmd_operands[pos++] = AVRCP_PDU_ID_GET_FOLDER_ITEMS; 282 uint8_t param_length = 5; 283 uint8_t param_length_pos = pos; 284 pos += 2; 285 286 avrcp_status_code_t status = AVRCP_STATUS_SUCCESS; 287 uint8_t status_pos = pos; 288 pos++; 289 290 big_endian_store_16(connection->cmd_operands, pos, uid_counter); 291 pos += 2; 292 293 // TODO: fragmentation 294 if (attr_list_size > sizeof(connection->cmd_operands)){ 295 connection->attr_list = attr_list; 296 connection->attr_list_size = attr_list_size; 297 log_info(" todo: list too big, invoke fragmentation"); 298 return 1; 299 } 300 301 uint16_t items_byte_len = 0; 302 if (connection->start_item < num_items) { 303 if (connection->end_item < num_items) { 304 items_byte_len = connection->end_item - connection->start_item + 1; 305 } else { 306 items_byte_len = num_items - connection->start_item; 307 } 308 309 } else { 310 big_endian_store_16(connection->cmd_operands, pos, 0); 311 pos += 2; 312 } 313 big_endian_store_16(connection->cmd_operands, pos, items_byte_len); 314 pos += 2; 315 param_length += items_byte_len; 316 317 if (items_byte_len > 0){ 318 (void)memcpy(&connection->cmd_operands[pos], attr_list, attr_list_size); 319 pos += attr_list_size; 320 } else { 321 status = AVRCP_STATUS_RANGE_OUT_OF_BOUNDS; 322 } 323 324 big_endian_store_16(connection->cmd_operands, param_length_pos, param_length); 325 connection->cmd_operands[status_pos] = status; 326 327 btstack_assert(pos <= 400); 328 connection->cmd_operands_length = pos; 329 330 connection->state = AVCTP_W2_SEND_RESPONSE; 331 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 332 return ERROR_CODE_SUCCESS; 333 } 334 335 uint8_t avrcp_browsing_target_send_accept_set_browsed_player(uint16_t avrcp_browsing_cid, uint16_t uid_counter, uint16_t browsed_player_id, uint8_t * response, uint16_t response_size){ 336 avrcp_connection_t * avrcp_connection = avrcp_get_connection_for_browsing_cid_for_role(AVRCP_TARGET, avrcp_browsing_cid); 337 if (!avrcp_connection){ 338 log_error("Could not find an AVRCP Target connection for browsing_cid 0x%02x.", avrcp_browsing_cid); 339 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 340 } 341 342 avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; 343 if (!connection){ 344 log_info("Could not find a browsing connection."); 345 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 346 } 347 348 if (connection->state != AVCTP_CONNECTION_OPENED) { 349 log_info("Browsing connection wrong state."); 350 return ERROR_CODE_COMMAND_DISALLOWED; 351 } 352 353 connection->browsed_player_id = browsed_player_id; 354 355 uint16_t pos = 0; 356 connection->cmd_operands[pos++] = AVRCP_PDU_ID_SET_BROWSED_PLAYER; 357 big_endian_store_16(connection->cmd_operands, pos, response_size + 2 + 1); // uuid counter + status 358 pos += 2; 359 360 connection->cmd_operands[pos++] = AVRCP_STATUS_SUCCESS; 361 big_endian_store_16(connection->cmd_operands, pos, uid_counter); 362 pos += 2; 363 364 // TODO: fragmentation 365 if (response_size > sizeof(connection->cmd_operands)){ 366 connection->attr_list = response; 367 connection->attr_list_size = response_size; 368 log_info(" todo: list too big, invoke fragmentation"); 369 return 1; 370 } 371 372 (void)memcpy(&connection->cmd_operands[pos], response, response_size); 373 pos += response_size; 374 btstack_assert(pos <= 255); 375 connection->cmd_operands_length = (uint8_t) pos; 376 377 connection->state = AVCTP_W2_SEND_RESPONSE; 378 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 379 return ERROR_CODE_SUCCESS; 380 } 381 382 uint8_t avrcp_browsing_target_send_reject_set_browsed_player(uint16_t avrcp_browsing_cid, avrcp_status_code_t status){ 383 avrcp_connection_t * avrcp_connection = avrcp_get_connection_for_browsing_cid_for_role(AVRCP_TARGET, avrcp_browsing_cid); 384 if (!avrcp_connection){ 385 log_error("Could not find an AVRCP Target connection for browsing_cid 0x%02x.", avrcp_browsing_cid); 386 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 387 } 388 389 avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; 390 if (!connection){ 391 log_info("Could not find a browsing connection."); 392 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 393 } 394 395 if (connection->state != AVCTP_CONNECTION_OPENED) { 396 log_info("Browsing connection wrong state."); 397 return ERROR_CODE_COMMAND_DISALLOWED; 398 } 399 400 int pos = 0; 401 connection->cmd_operands[pos++] = AVRCP_PDU_ID_SET_BROWSED_PLAYER; 402 big_endian_store_16(connection->cmd_operands, pos, 1); 403 pos += 2; 404 connection->cmd_operands[pos++] = status; 405 connection->cmd_operands_length = pos; 406 407 connection->state = AVCTP_W2_SEND_RESPONSE; 408 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 409 return ERROR_CODE_SUCCESS; 410 } 411 412 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){ 413 avrcp_connection_t * avrcp_connection = avrcp_get_connection_for_browsing_cid_for_role(AVRCP_TARGET, avrcp_browsing_cid); 414 if (!avrcp_connection){ 415 log_error("Could not find an AVRCP Target connection for browsing_cid 0x%02x.", avrcp_browsing_cid); 416 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 417 } 418 419 avrcp_browsing_connection_t * connection = avrcp_connection->browsing_connection; 420 if (!connection){ 421 log_info("Could not find a browsing connection."); 422 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 423 } 424 425 if (connection->state != AVCTP_CONNECTION_OPENED) { 426 log_info("Browsing connection wrong state."); 427 return ERROR_CODE_COMMAND_DISALLOWED; 428 } 429 430 int pos = 0; 431 connection->cmd_operands[pos++] = AVRCP_PDU_ID_GET_TOTAL_NUMBER_OF_ITEMS; 432 big_endian_store_16(connection->cmd_operands, pos, 7); 433 pos += 2; 434 connection->cmd_operands[pos++] = AVRCP_STATUS_SUCCESS; 435 big_endian_store_16(connection->cmd_operands, pos, uid_counter); 436 pos += 2; 437 big_endian_store_32(connection->cmd_operands, pos, total_num_items); 438 pos += 4; 439 connection->cmd_operands_length = pos; 440 441 connection->state = AVCTP_W2_SEND_RESPONSE; 442 avrcp_browsing_request_can_send_now(connection, connection->l2cap_browsing_cid); 443 return ERROR_CODE_SUCCESS; 444 } 445 446