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_target.c" 39 40 #include <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <inttypes.h> 45 46 #include "btstack.h" 47 #include "classic/avrcp.h" 48 49 #define AVRCP_ATTR_HEADER_LEN 8 50 51 static const uint8_t AVRCP_NOTIFICATION_TRACK_SELECTED[] = {0,0,0,0,0,0,0,0}; 52 static const uint8_t AVRCP_NOTIFICATION_TRACK_NOT_SELECTED[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; 53 54 static avrcp_context_t avrcp_target_context; 55 56 void avrcp_target_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint8_t browsing, uint16_t supported_features, const char * service_name, const char * service_provider_name){ 57 avrcp_create_sdp_record(0, service, service_record_handle, browsing, supported_features, service_name, service_provider_name); 58 } 59 60 static void avrcp_target_emit_operation(btstack_packet_handler_t callback, uint16_t avrcp_cid, avrcp_operation_id_t operation_id, uint8_t operands_length, uint8_t operand){ 61 if (!callback) return; 62 uint8_t event[8]; 63 int pos = 0; 64 event[pos++] = HCI_EVENT_AVRCP_META; 65 event[pos++] = sizeof(event) - 2; 66 event[pos++] = AVRCP_SUBEVENT_OPERATION; 67 little_endian_store_16(event, pos, avrcp_cid); 68 pos += 2; 69 event[pos++] = operation_id; 70 event[pos++] = operands_length; 71 event[pos++] = operand; 72 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 73 } 74 75 static void avrcp_target_emit_respond_vendor_dependent_query(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t subevent_id){ 76 if (!callback) return; 77 uint8_t event[5]; 78 int pos = 0; 79 event[pos++] = HCI_EVENT_AVRCP_META; 80 event[pos++] = sizeof(event) - 2; 81 event[pos++] = subevent_id; 82 little_endian_store_16(event, pos, avrcp_cid); 83 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 84 } 85 86 static uint16_t avrcp_target_pack_single_element_attribute_number(uint8_t * packet, uint16_t pos, avrcp_media_attribute_id_t attr_id, uint32_t value){ 87 if ((attr_id < 1) || (attr_id > AVRCP_MEDIA_ATTR_COUNT)) return 0; 88 uint16_t attr_value_length = sprintf((char *)(packet+pos+8), "%0" PRIu32, value); 89 big_endian_store_32(packet, pos, attr_id); 90 pos += 4; 91 big_endian_store_16(packet, pos, RFC2978_CHARSET_MIB_UTF8); 92 pos += 2; 93 big_endian_store_16(packet, pos, attr_value_length); 94 pos += 2; 95 return 8 + attr_value_length; 96 } 97 98 static uint16_t avrcp_target_pack_single_element_attribute_string(uint8_t * packet, uint16_t pos, rfc2978_charset_mib_enumid_t mib_enumid, avrcp_media_attribute_id_t attr_id, uint8_t * attr_value, uint16_t attr_value_to_copy, uint16_t attr_value_size, uint8_t header){ 99 if (attr_value_size == 0) return 0; 100 if ((attr_id < 1) || (attr_id > AVRCP_MEDIA_ATTR_COUNT)) return 0; 101 if (header){ 102 big_endian_store_32(packet, pos, attr_id); 103 pos += 4; 104 big_endian_store_16(packet, pos, mib_enumid); 105 pos += 2; 106 big_endian_store_16(packet, pos, attr_value_size); 107 pos += 2; 108 } 109 memcpy(packet+pos, attr_value, attr_value_to_copy); 110 pos += attr_value_size; 111 return header * 8 + attr_value_size; 112 } 113 114 static int avrcp_target_abort_continue_response(uint16_t cid, avrcp_connection_t * connection){ 115 uint16_t pos = 0; 116 l2cap_reserve_packet_buffer(); 117 uint8_t * packet = l2cap_get_outgoing_buffer(); 118 119 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 120 connection->command_type = AVRCP_CTYPE_RESPONSE_ACCEPTED; 121 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 122 connection->subunit_id = AVRCP_SUBUNIT_ID; 123 124 packet[pos++] = (connection->transaction_label << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 125 // Profile IDentifier (PID) 126 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 127 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 128 129 // command_type 130 packet[pos++] = connection->command_type; 131 // subunit_type | subunit ID 132 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 133 // opcode 134 packet[pos++] = (uint8_t)connection->command_opcode; 135 136 // company id is 3 bytes long 137 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 138 pos += 3; 139 140 packet[pos++] = AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE; 141 142 // reserve byte for packet type 143 packet[pos++] = AVRCP_SINGLE_PACKET; 144 big_endian_store_16(packet, pos, 0); 145 pos += 2; 146 return l2cap_send_prepared(cid, pos); 147 } 148 149 static int avrcp_target_send_now_playing_info(uint16_t cid, avrcp_connection_t * connection){ 150 uint16_t pos = 0; 151 l2cap_reserve_packet_buffer(); 152 uint8_t * packet = l2cap_get_outgoing_buffer(); 153 uint16_t size = l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid); 154 155 packet[pos++] = (connection->transaction_label << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 156 // Profile IDentifier (PID) 157 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 158 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 159 160 // command_type 161 packet[pos++] = connection->command_type; 162 // subunit_type | subunit ID 163 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 164 // opcode 165 packet[pos++] = (uint8_t)connection->command_opcode; 166 167 // company id is 3 bytes long 168 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 169 pos += 3; 170 171 packet[pos++] = AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES; 172 173 // reserve byte for packet type 174 uint8_t pos_packet_type = pos; 175 pos++; 176 177 uint16_t playing_info_buffer_len_position = pos; 178 pos += 2; 179 // printf("connection->next_attr_id %d \n", connection->next_attr_id); 180 if (connection->next_attr_id == AVRCP_MEDIA_ATTR_NONE){ 181 packet[pos_packet_type] = AVRCP_SINGLE_PACKET; 182 connection->packet_type = AVRCP_SINGLE_PACKET; 183 packet[pos++] = count_set_bits_uint32(connection->now_playing_info_attr_bitmap); 184 connection->next_attr_id++; 185 } 186 // printf("updated connection->next_attr_id %d, connection->attribute_value_offset %d \n", connection->next_attr_id, connection->attribute_value_offset); 187 188 uint8_t fragmented = 0; 189 int num_free_bytes = size - pos - 2; 190 uint8_t MAX_NUMBER_ATTR_LEN = 10; 191 192 while (!fragmented && num_free_bytes > 0 && connection->next_attr_id <= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS){ 193 avrcp_media_attribute_id_t attr_id = connection->next_attr_id; 194 int attr_index = attr_id - 1; 195 196 if (connection->now_playing_info_attr_bitmap & (1 << attr_id)){ 197 int num_written_bytes = 0; 198 int num_bytes_to_write = 0; 199 switch (attr_id){ 200 case AVRCP_MEDIA_ATTR_ALL: 201 case AVRCP_MEDIA_ATTR_NONE: 202 break; 203 case AVRCP_MEDIA_ATTR_TRACK: 204 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 205 if (num_free_bytes >= num_bytes_to_write){ 206 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->track_nr); 207 break; 208 } 209 fragmented = 1; 210 connection->attribute_value_offset = 0; 211 break; 212 case AVRCP_MEDIA_ATTR_TOTAL_TRACKS: 213 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 214 if (num_free_bytes >= num_bytes_to_write){ 215 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->total_tracks); 216 break; 217 } 218 fragmented = 1; 219 connection->attribute_value_offset = 0; 220 break; 221 case AVRCP_MEDIA_ATTR_SONG_LENGTH_MS: 222 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 223 if (num_free_bytes >= num_bytes_to_write){ 224 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->song_length_ms); 225 break; 226 } 227 fragmented = 1; 228 connection->attribute_value_offset = 0; 229 break; 230 default:{ 231 uint8_t header = (connection->attribute_value_offset == 0); 232 uint8_t * attr_value = (uint8_t *) (connection->now_playing_info[attr_index].value + connection->attribute_value_offset); 233 uint16_t attr_value_len = connection->now_playing_info[attr_index].len - connection->attribute_value_offset; 234 235 num_bytes_to_write = attr_value_len + header * AVRCP_ATTR_HEADER_LEN; 236 if (num_bytes_to_write <= num_free_bytes){ 237 connection->attribute_value_offset = 0; 238 num_written_bytes = num_bytes_to_write; 239 avrcp_target_pack_single_element_attribute_string(packet, pos, RFC2978_CHARSET_MIB_UTF8, attr_id, attr_value, attr_value_len, connection->now_playing_info[attr_index].len, header); 240 break; 241 } 242 fragmented = 1; 243 num_written_bytes = num_free_bytes; 244 attr_value_len = num_free_bytes - header * AVRCP_ATTR_HEADER_LEN; 245 avrcp_target_pack_single_element_attribute_string(packet, pos, RFC2978_CHARSET_MIB_UTF8, attr_id, attr_value, attr_value_len, connection->now_playing_info[attr_index].len, header); 246 connection->attribute_value_offset += attr_value_len; 247 break; 248 } 249 } 250 pos += num_written_bytes; 251 num_free_bytes -= num_written_bytes; 252 } 253 if (!fragmented){ 254 connection->next_attr_id++; 255 } 256 } 257 258 if (fragmented){ 259 switch (connection->packet_type){ 260 case AVRCP_SINGLE_PACKET: 261 connection->packet_type = AVRCP_START_PACKET; 262 break; 263 default: 264 connection->packet_type = AVRCP_CONTINUE_PACKET; 265 break; 266 } 267 } else { 268 if (connection->next_attr_id >= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS){ // DONE 269 if (connection->packet_type != AVRCP_SINGLE_PACKET){ 270 connection->packet_type = AVRCP_END_PACKET; 271 } 272 } 273 } 274 packet[pos_packet_type] = connection->packet_type; 275 // store attr value length 276 big_endian_store_16(packet, playing_info_buffer_len_position, pos - playing_info_buffer_len_position - 2); 277 return l2cap_send_prepared(cid, size); 278 } 279 280 281 282 static int avrcp_target_send_response(uint16_t cid, avrcp_connection_t * connection){ 283 int pos = 0; 284 l2cap_reserve_packet_buffer(); 285 uint8_t * packet = l2cap_get_outgoing_buffer(); 286 287 // transport header 288 // Transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 289 290 // TODO: check for fragmentation 291 connection->packet_type = AVRCP_SINGLE_PACKET; 292 293 packet[pos++] = (connection->transaction_label << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 294 // Profile IDentifier (PID) 295 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 296 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 297 // command_type 298 packet[pos++] = connection->command_type; 299 // subunit_type | subunit ID 300 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 301 // opcode 302 packet[pos++] = (uint8_t)connection->command_opcode; 303 // operands 304 memcpy(packet+pos, connection->cmd_operands, connection->cmd_operands_length); 305 // printf_hexdump(packet+pos, connection->cmd_operands_length); 306 307 pos += connection->cmd_operands_length; 308 connection->wait_to_send = 0; 309 return l2cap_send_prepared(cid, pos); 310 } 311 312 static uint8_t avrcp_target_response_reject(avrcp_connection_t * connection, avrcp_subunit_type_t subunit_type, avrcp_subunit_id_t subunit_id, avrcp_command_opcode_t opcode, avrcp_pdu_id_t pdu_id, avrcp_status_code_t status){ 313 // AVRCP_CTYPE_RESPONSE_REJECTED 314 connection->command_type = AVRCP_CTYPE_RESPONSE_REJECTED; 315 connection->subunit_type = subunit_type; 316 connection->subunit_id = subunit_id; 317 connection->command_opcode = opcode; 318 // company id is 3 bytes long 319 int pos = connection->cmd_operands_length; 320 connection->cmd_operands[pos++] = pdu_id; 321 connection->cmd_operands[pos++] = 0; 322 // param length 323 big_endian_store_16(connection->cmd_operands, pos, 1); 324 pos += 2; 325 connection->cmd_operands[pos++] = status; 326 connection->cmd_operands_length = pos; 327 connection->state = AVCTP_W2_SEND_RESPONSE; 328 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 329 return ERROR_CODE_SUCCESS; 330 } 331 332 static uint8_t avrcp_target_response_not_implemented(avrcp_connection_t * connection, avrcp_subunit_type_t subunit_type, avrcp_subunit_id_t subunit_id, avrcp_command_opcode_t opcode, avrcp_pdu_id_t pdu_id, uint8_t event_id){ 333 connection->command_type = AVRCP_CTYPE_RESPONSE_NOT_IMPLEMENTED; 334 connection->subunit_type = subunit_type; 335 connection->subunit_id = subunit_id; 336 connection->command_opcode = opcode; 337 338 // company id is 3 bytes long 339 int pos = connection->cmd_operands_length; 340 connection->cmd_operands[pos++] = pdu_id; 341 connection->cmd_operands[pos++] = 0; 342 // param length 343 big_endian_store_16(connection->cmd_operands, pos, 1); 344 pos += 2; 345 connection->cmd_operands[pos++] = event_id; 346 connection->cmd_operands_length = pos; 347 348 connection->state = AVCTP_W2_SEND_RESPONSE; 349 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 350 return ERROR_CODE_SUCCESS; 351 } 352 353 static uint8_t avrcp_target_response_vendor_dependent_interim(avrcp_connection_t * connection, avrcp_subunit_type_t subunit_type, avrcp_subunit_id_t subunit_id, avrcp_command_opcode_t opcode, avrcp_pdu_id_t pdu_id, uint8_t event_id, const uint8_t * value, uint16_t value_len){ 354 connection->command_type = AVRCP_CTYPE_RESPONSE_INTERIM; 355 connection->subunit_type = subunit_type; 356 connection->subunit_id = subunit_id; 357 connection->command_opcode = opcode; 358 359 // company id is 3 bytes long 360 int pos = connection->cmd_operands_length; 361 connection->cmd_operands[pos++] = pdu_id; 362 connection->cmd_operands[pos++] = 0; 363 // param length 364 big_endian_store_16(connection->cmd_operands, pos, 1 + value_len); 365 pos += 2; 366 connection->cmd_operands[pos++] = event_id; 367 if (value && value_len > 0){ 368 memcpy(connection->cmd_operands + pos, value, value_len); 369 pos += value_len; 370 } 371 connection->cmd_operands_length = pos; 372 373 connection->state = AVCTP_W2_SEND_RESPONSE; 374 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 375 return ERROR_CODE_SUCCESS; 376 } 377 378 // static uint8_t avrcp_target_response_vendor_dependent_changed(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t event_id){ 379 // connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 380 // connection->command_type = AVRCP_CTYPE_RESPONSE_CHANGED_STABLE; 381 // connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 382 // connection->subunit_id = AVRCP_SUBUNIT_ID; 383 384 // // company id is 3 bytes long 385 // int pos = connection->cmd_operands_length; 386 // connection->cmd_operands[pos++] = pdu_id; 387 // connection->cmd_operands[pos++] = 0; 388 // // param length 389 // big_endian_store_16(connection->cmd_operands, pos, 1); 390 // pos += 2; 391 // connection->cmd_operands[pos++] = event_id; 392 // connection->cmd_operands_length = pos; 393 394 // connection->state = AVCTP_W2_SEND_RESPONSE; 395 // avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 396 // return ERROR_CODE_SUCCESS; 397 // } 398 399 static uint8_t avrcp_target_pass_through_response(uint16_t avrcp_cid, avrcp_command_type_t cmd_type, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 400 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 401 if (!connection){ 402 log_error("avrcp_target_operation_reject: could not find a connection."); 403 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 404 } 405 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 406 // printf("avrcp_target_pass_through_response: operation 0x%02x, operands length %d\n", opid, operands_length); 407 408 connection->command_type = cmd_type; 409 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 410 connection->subunit_id = AVRCP_SUBUNIT_ID; 411 connection->command_opcode = AVRCP_CMD_OPCODE_PASS_THROUGH; 412 413 int pos = 0; 414 connection->cmd_operands[pos++] = opid; 415 connection->cmd_operands[pos++] = operands_length; 416 if (operands_length == 1){ 417 connection->cmd_operands[pos++] = operand; 418 } 419 connection->cmd_operands_length = pos; 420 421 connection->state = AVCTP_W2_SEND_RESPONSE; 422 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 423 return ERROR_CODE_SUCCESS; 424 } 425 426 uint8_t avrcp_target_operation_rejected(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 427 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_REJECTED, opid, operands_length, operand); 428 } 429 430 uint8_t avrcp_target_operation_accepted(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 431 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 432 } 433 434 uint8_t avrcp_target_operation_not_implemented(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 435 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 436 } 437 438 void avrcp_target_set_unit_info(uint16_t avrcp_cid, avrcp_subunit_type_t unit_type, uint32_t company_id){ 439 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 440 if (!connection){ 441 log_error("avrcp_target_operation_reject: could not find a connection."); 442 return; 443 } 444 connection->unit_type = unit_type; 445 connection->company_id = company_id; 446 } 447 448 void avrcp_target_set_subunit_info(uint16_t avrcp_cid, avrcp_subunit_type_t subunit_type, const uint8_t * subunit_info_data, uint16_t subunit_info_data_size){ 449 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 450 if (!connection){ 451 log_error("avrcp_target_operation_reject: could not find a connection."); 452 return; 453 } 454 connection->subunit_info_type = subunit_type; 455 connection->subunit_info_data = subunit_info_data; 456 connection->subunit_info_data_size = subunit_info_data_size; 457 } 458 459 static uint8_t avrcp_target_unit_info(avrcp_connection_t * connection){ 460 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 461 462 uint8_t unit = 0; 463 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 464 connection->subunit_type = AVRCP_SUBUNIT_TYPE_UNIT; //vendor unique 465 connection->subunit_id = AVRCP_SUBUNIT_ID_IGNORE; 466 connection->command_opcode = AVRCP_CMD_OPCODE_UNIT_INFO; 467 468 connection->cmd_operands_length = 5; 469 connection->cmd_operands[0] = 0x07; 470 connection->cmd_operands[1] = (connection->unit_type << 4) | unit; 471 // company id is 3 bytes long 472 big_endian_store_32(connection->cmd_operands, 2, connection->company_id); 473 474 connection->state = AVCTP_W2_SEND_RESPONSE; 475 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 476 return ERROR_CODE_SUCCESS; 477 } 478 479 static uint8_t avrcp_target_subunit_info(avrcp_connection_t * connection, uint8_t offset){ 480 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 481 if (offset - 4 > connection->subunit_info_data_size) return AVRCP_STATUS_INVALID_PARAMETER; 482 483 connection->command_opcode = AVRCP_CMD_OPCODE_SUBUNIT_INFO; 484 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 485 connection->subunit_type = AVRCP_SUBUNIT_TYPE_UNIT; //vendor unique 486 connection->subunit_id = AVRCP_SUBUNIT_ID_IGNORE; 487 // printf("avrcp_target_subunit_info subunit_type %d\n", connection->subunit_type); 488 489 uint8_t page = offset / 4; 490 uint8_t extension_code = 7; 491 connection->cmd_operands_length = 5; 492 connection->cmd_operands[0] = (page << 4) | extension_code; 493 494 memcpy(connection->cmd_operands+1, connection->subunit_info_data + offset, 4); 495 496 connection->state = AVCTP_W2_SEND_RESPONSE; 497 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 498 return ERROR_CODE_SUCCESS; 499 } 500 501 static inline uint8_t avrcp_prepare_vendor_dependent_response(uint16_t avrcp_cid, avrcp_connection_t ** out_connection, avrcp_pdu_id_t pdu_id, uint16_t param_length){ 502 *out_connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 503 if (!*out_connection){ 504 log_error("avrcp tartget: could not find a connection."); 505 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 506 } 507 508 if ((*out_connection)->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 509 (*out_connection)->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 510 (*out_connection)->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 511 (*out_connection)->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 512 (*out_connection)->subunit_id = AVRCP_SUBUNIT_ID; 513 514 (*out_connection)->cmd_operands[(*out_connection)->cmd_operands_length++] = pdu_id; 515 // reserved 516 (*out_connection)->cmd_operands[(*out_connection)->cmd_operands_length++] = 0; 517 // param length 518 big_endian_store_16((*out_connection)->cmd_operands, (*out_connection)->cmd_operands_length, param_length); 519 (*out_connection)->cmd_operands_length += 2; 520 return ERROR_CODE_SUCCESS; 521 } 522 523 static uint8_t avrcp_target_capability(uint16_t avrcp_cid, avrcp_capability_id_t capability_id, uint8_t capabilities_num, uint8_t * capabilities, uint8_t size){ 524 avrcp_connection_t * connection = NULL; 525 uint8_t status = avrcp_prepare_vendor_dependent_response(avrcp_cid, &connection, AVRCP_PDU_ID_GET_CAPABILITIES, 2+size); 526 if (status != ERROR_CODE_SUCCESS) return status; 527 528 connection->cmd_operands[connection->cmd_operands_length++] = capability_id; 529 connection->cmd_operands[connection->cmd_operands_length++] = capabilities_num; 530 memcpy(connection->cmd_operands+connection->cmd_operands_length, capabilities, size); 531 connection->cmd_operands_length += size; 532 533 connection->state = AVCTP_W2_SEND_RESPONSE; 534 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 535 return ERROR_CODE_SUCCESS; 536 } 537 538 uint8_t avrcp_target_supported_events(uint16_t avrcp_cid, uint8_t capabilities_num, uint8_t * capabilities, uint8_t size){ 539 return avrcp_target_capability(avrcp_cid, AVRCP_CAPABILITY_ID_EVENT, capabilities_num, capabilities, size); 540 } 541 542 uint8_t avrcp_target_supported_companies(uint16_t avrcp_cid, uint8_t capabilities_num, uint8_t * capabilities, uint8_t size ){ 543 return avrcp_target_capability(avrcp_cid, AVRCP_CAPABILITY_ID_COMPANY, capabilities_num, capabilities, size); 544 } 545 546 uint8_t avrcp_target_play_status(uint16_t avrcp_cid, uint32_t song_length_ms, uint32_t song_position_ms, avrcp_playback_status_t play_status){ 547 avrcp_connection_t * connection = NULL; 548 uint8_t status = avrcp_prepare_vendor_dependent_response(avrcp_cid, &connection, AVRCP_PDU_ID_GET_PLAY_STATUS, 11); 549 if (status != ERROR_CODE_SUCCESS) return status; 550 551 big_endian_store_32(connection->cmd_operands, connection->cmd_operands_length, song_length_ms); 552 connection->cmd_operands_length += 4; 553 big_endian_store_32(connection->cmd_operands, connection->cmd_operands_length, song_position_ms); 554 connection->cmd_operands_length += 4; 555 connection->cmd_operands[connection->cmd_operands_length++] = play_status; 556 557 connection->state = AVCTP_W2_SEND_RESPONSE; 558 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 559 return ERROR_CODE_SUCCESS; 560 } 561 562 static uint8_t avrcp_target_now_playing_info(avrcp_connection_t * connection){ 563 connection->now_playing_info_response = 1; 564 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 565 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 566 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 567 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 568 connection->subunit_id = AVRCP_SUBUNIT_ID; 569 570 connection->state = AVCTP_W2_SEND_RESPONSE; 571 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 572 return ERROR_CODE_SUCCESS; 573 } 574 575 static uint8_t avrcp_target_store_media_attr(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id, const char * value){ 576 int index = attr_id - 1; 577 if (!value) return AVRCP_STATUS_INVALID_PARAMETER; 578 connection->now_playing_info[index].value = (uint8_t*)value; 579 connection->now_playing_info[index].len = strlen(value); 580 // printf("store %lu bytes, %s\n", strlen(value), value); 581 return ERROR_CODE_SUCCESS; 582 } 583 584 uint8_t avrcp_target_set_playback_status(uint16_t avrcp_cid, avrcp_playback_status_t playback_status){ 585 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 586 if (!connection){ 587 log_error("avrcp_unit_info: could not find a connection."); 588 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 589 } 590 if (connection->playback_status == playback_status) return ERROR_CODE_SUCCESS; 591 592 connection->playback_status = playback_status; 593 connection->playback_status_changed = 1; 594 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 595 return ERROR_CODE_SUCCESS; 596 } 597 598 void avrcp_target_set_now_playing_info(uint16_t avrcp_cid, const avrcp_track_t * current_track, uint16_t total_tracks){ 599 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 600 if (!connection){ 601 log_error("avrcp_unit_info: could not find a connection. cid 0x%02x\n", avrcp_cid); 602 return; 603 } 604 if (!current_track){ 605 connection->track_selected = 0; 606 connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR; 607 return; 608 } 609 memcpy(connection->track_id, current_track->track_id, 8); 610 connection->song_length_ms = current_track->song_length_ms; 611 connection->track_nr = current_track->track_nr; 612 connection->total_tracks = total_tracks; 613 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_TITLE, current_track->title); 614 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ARTIST, current_track->artist); 615 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ALBUM, current_track->album); 616 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_GENRE, current_track->genre); 617 connection->track_selected = 1; 618 619 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 620 connection->track_changed = 1; 621 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 622 } 623 return; 624 } 625 626 uint8_t avrcp_target_playing_content_changed(uint16_t avrcp_cid){ 627 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 628 if (!connection){ 629 log_error("avrcp_unit_info: could not find a connection."); 630 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 631 } 632 connection->playing_content_changed = 1; 633 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 634 return ERROR_CODE_SUCCESS; 635 } 636 637 uint8_t avrcp_target_battery_status_changed(uint16_t avrcp_cid, avrcp_battery_status_t battery_status){ 638 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 639 if (!connection){ 640 log_error("avrcp_unit_info: could not find a connection."); 641 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 642 } 643 if (connection->battery_status == battery_status) return ERROR_CODE_SUCCESS; 644 connection->battery_status = battery_status; 645 connection->battery_status_changed = 1; 646 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 647 return ERROR_CODE_SUCCESS; 648 } 649 650 uint8_t avrcp_target_volume_changed(uint16_t avrcp_cid, uint8_t volume_percentage){ 651 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 652 if (!connection){ 653 log_error("avrcp_unit_info: could not find a connection."); 654 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 655 } 656 if (connection->volume_percentage == volume_percentage) return ERROR_CODE_SUCCESS; 657 658 connection->volume_percentage = volume_percentage; 659 connection->volume_percentage_changed = 1; 660 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 661 return ERROR_CODE_SUCCESS; 662 } 663 664 665 static uint8_t * avrcp_get_company_id(uint8_t *packet, uint16_t size){ 666 UNUSED(size); 667 return packet + 6; 668 } 669 670 static uint8_t * avrcp_get_pdu(uint8_t *packet, uint16_t size){ 671 UNUSED(size); 672 return packet + 9; 673 } 674 675 static uint8_t avrcp_is_receive_pass_through_cmd(uint8_t operation_id){ 676 return operation_id & 0x80; 677 } 678 679 static void avrcp_handle_l2cap_data_packet_for_signaling_connection(avrcp_connection_t * connection, uint8_t *packet, uint16_t size){ 680 UNUSED(connection); 681 UNUSED(packet); 682 UNUSED(size); 683 684 // uint8_t opcode; 685 686 uint8_t transport_header = packet[0]; 687 connection->transaction_label = transport_header >> 4; 688 // uint8_t packet_type = (transport_header & 0x0F) >> 2; 689 // uint8_t frame_type = (transport_header & 0x03) >> 1; 690 // uint8_t ipid = transport_header & 0x01; 691 // uint8_t byte_value = packet[2]; 692 // uint16_t pid = (byte_value << 8) | packet[2]; 693 694 // avrcp_command_type_t ctype = (avrcp_command_type_t) packet[3]; 695 // uint8_t byte_value = packet[4]; 696 avrcp_subunit_type_t subunit_type = (avrcp_subunit_type_t) (packet[4] >> 3); 697 avrcp_subunit_id_t subunit_id = (avrcp_subunit_id_t) (packet[4] & 0x07); 698 // opcode = packet[pos++]; 699 700 // printf(" Transport header 0x%02x (transaction_label %d, packet_type %d, frame_type %d, ipid %d), pid 0x%4x\n", 701 // transport_header, transaction_label, packet_type, frame_type, ipid, pid); 702 // printf_hexdump(packet+pos, size-pos); 703 704 avrcp_command_opcode_t opcode = avrcp_cmd_opcode(packet,size); 705 uint8_t * company_id = avrcp_get_company_id(packet, size); 706 uint8_t * pdu = avrcp_get_pdu(packet, size); 707 // uint16_t param_length = big_endian_read_16(pdu, 2); 708 709 int pos = 4; 710 uint8_t pdu_id; 711 connection->cmd_operands_length = 0; 712 713 switch (opcode){ 714 case AVRCP_CMD_OPCODE_UNIT_INFO: 715 avrcp_target_unit_info(connection); 716 break; 717 case AVRCP_CMD_OPCODE_SUBUNIT_INFO:{ 718 uint8_t offset = 4 * (packet[pos+2]>>4); 719 avrcp_target_subunit_info(connection, offset); 720 break; 721 } 722 case AVRCP_CMD_OPCODE_PASS_THROUGH:{ 723 log_info("AVRCP_OPERATION_ID 0x%02x, operands length %d, operand %d", packet[6], packet[7], packet[8]); 724 avrcp_operation_id_t operation_id = packet[6]; 725 726 if (avrcp_is_receive_pass_through_cmd(operation_id)){ 727 operation_id = packet[6] & 0x7F; 728 } 729 730 switch (operation_id){ 731 case AVRCP_OPERATION_ID_PLAY: 732 case AVRCP_OPERATION_ID_PAUSE: 733 case AVRCP_OPERATION_ID_STOP: 734 avrcp_target_operation_accepted(connection->avrcp_cid, packet[6], packet[7], packet[8]); 735 avrcp_target_emit_operation(avrcp_target_context.avrcp_callback, connection->avrcp_cid, packet[6], packet[7], packet[8]); 736 break; 737 case AVRCP_OPERATION_ID_REWIND: 738 case AVRCP_OPERATION_ID_FAST_FORWARD: 739 case AVRCP_OPERATION_ID_FORWARD: 740 case AVRCP_OPERATION_ID_BACKWARD: 741 case AVRCP_OPERATION_ID_SKIP: 742 case AVRCP_OPERATION_ID_VOLUME_UP: 743 case AVRCP_OPERATION_ID_VOLUME_DOWN: 744 case AVRCP_OPERATION_ID_MUTE: 745 case AVRCP_OPERATION_ID_UNDEFINED: 746 avrcp_target_operation_not_implemented(connection->avrcp_cid, packet[6], packet[7], packet[8]); 747 return; 748 default: 749 avrcp_target_operation_not_implemented(connection->avrcp_cid, packet[6], packet[7], packet[8]); 750 break; 751 } 752 break; 753 } 754 755 case AVRCP_CMD_OPCODE_VENDOR_DEPENDENT: 756 pdu_id = pdu[0]; 757 // 1 - reserved 758 // 2-3 param length, 759 memcpy(connection->cmd_operands, company_id, 3); 760 connection->cmd_operands_length = 3; 761 switch (pdu_id){ 762 case AVRCP_PDU_ID_GET_CAPABILITIES:{ 763 avrcp_capability_id_t capability_id = (avrcp_capability_id_t) pdu[pos]; 764 switch (capability_id){ 765 case AVRCP_CAPABILITY_ID_EVENT: 766 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_EVENT_IDS_QUERY); 767 break; 768 case AVRCP_CAPABILITY_ID_COMPANY: 769 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_COMPANY_IDS_QUERY); 770 break; 771 default: 772 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 773 break; 774 } 775 break; 776 } 777 case AVRCP_PDU_ID_GET_PLAY_STATUS: 778 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_PLAY_STATUS_QUERY); 779 break; 780 case AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE: 781 connection->cmd_operands[0] = pdu[4]; 782 connection->abort_continue_response = 1; 783 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 784 break; 785 case AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE: 786 if (pdu[4] != AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES){ 787 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 788 return; 789 } 790 connection->now_playing_info_response = 1; 791 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 792 break; 793 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES:{ 794 uint8_t play_identifier[8]; 795 memset(play_identifier, 0, 8); 796 if (memcmp(pdu+pos, play_identifier, 8) != 0) { 797 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 798 return; 799 } 800 pos += 8; 801 uint8_t attribute_count = pdu[pos++]; 802 // printf("AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES attribute count %d\n", attribute_count); 803 connection->next_attr_id = AVRCP_MEDIA_ATTR_NONE; 804 if (!attribute_count){ 805 connection->now_playing_info_attr_bitmap = 0xFE; 806 } else { 807 int i; 808 connection->now_playing_info_attr_bitmap = 0; 809 for (i=0; i < attribute_count; i++){ 810 uint16_t attr_id = big_endian_read_16(pdu, pos); 811 pos += 2; 812 connection->now_playing_info_attr_bitmap |= (1 << attr_id); 813 } 814 } 815 log_info("now_playing_info_attr_bitmap 0x%02x", connection->now_playing_info_attr_bitmap); 816 avrcp_target_now_playing_info(connection); 817 break; 818 } 819 case AVRCP_PDU_ID_REGISTER_NOTIFICATION:{ 820 // 0 - pdu id 821 // 1 - reserved 822 // 2-3 param length 823 avrcp_notification_event_id_t event_id = (avrcp_notification_event_id_t) pdu[4]; 824 uint16_t event_mask = (1 << event_id); 825 826 switch (event_id){ 827 case AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED: 828 connection->notifications_enabled |= event_mask; 829 if (connection->track_selected){ 830 avrcp_target_response_vendor_dependent_interim(connection, subunit_type, subunit_id, opcode, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_SELECTED, 8); 831 } else { 832 avrcp_target_response_vendor_dependent_interim(connection, subunit_type, subunit_id, opcode, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_NOT_SELECTED, 8); 833 } 834 break; 835 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED: 836 connection->notifications_enabled |= event_mask; 837 avrcp_target_response_vendor_dependent_interim(connection, subunit_type, subunit_id, opcode, pdu_id, event_id, (const uint8_t *)&connection->playback_status, 1); 838 break; 839 case AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED: 840 connection->notifications_enabled |= event_mask; 841 avrcp_target_response_vendor_dependent_interim(connection, subunit_type, subunit_id, opcode, pdu_id, event_id, NULL, 0); 842 break; 843 case AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED: 844 connection->notifications_enabled |= event_mask; 845 avrcp_target_response_vendor_dependent_interim(connection, subunit_type, subunit_id, opcode, pdu_id, event_id, (const uint8_t *)&connection->volume_percentage, 1); 846 break; 847 case AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: 848 connection->notifications_enabled |= event_mask; 849 avrcp_target_response_vendor_dependent_interim(connection, subunit_type, subunit_id, opcode, pdu_id, event_id, (const uint8_t *)&connection->battery_status, 1); 850 break; 851 case AVRCP_NOTIFICATION_EVENT_AVAILABLE_PLAYERS_CHANGED: 852 case AVRCP_NOTIFICATION_EVENT_PLAYER_APPLICATION_SETTING_CHANGED: 853 case AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED: 854 case AVRCP_NOTIFICATION_EVENT_UIDS_CHANGED: 855 avrcp_target_response_not_implemented(connection, subunit_type, subunit_id, opcode, pdu_id, event_id); 856 return; 857 default: 858 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 859 return; 860 } 861 break; 862 } 863 default: 864 log_info("AVRCP target: unhandled pdu id 0x%02x", pdu_id); 865 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 866 break; 867 } 868 break; 869 default: 870 log_info("AVRCP target: opcode 0x%02x not implemented", avrcp_cmd_opcode(packet,size)); 871 break; 872 } 873 } 874 875 static int avrcp_target_send_notification(uint16_t cid, avrcp_connection_t * connection, uint8_t notification_id, uint8_t * value, uint16_t value_len){ 876 if (!connection){ 877 log_error("avrcp tartget: could not find a connection."); 878 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 879 } 880 881 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 882 connection->command_type = AVRCP_CTYPE_RESPONSE_CHANGED_STABLE; 883 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 884 connection->subunit_id = AVRCP_SUBUNIT_ID; 885 886 uint16_t pos = 0; 887 l2cap_reserve_packet_buffer(); 888 uint8_t * packet = l2cap_get_outgoing_buffer(); 889 uint16_t size = l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid); 890 891 connection->packet_type = AVRCP_SINGLE_PACKET; 892 packet[pos++] = (connection->transaction_label << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 893 // Profile IDentifier (PID) 894 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 895 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 896 897 // command_type 898 packet[pos++] = connection->command_type; 899 // subunit_type | subunit ID 900 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 901 // opcode 902 packet[pos++] = (uint8_t)connection->command_opcode; 903 904 // company id is 3 bytes long 905 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 906 pos += 3; 907 908 packet[pos++] = AVRCP_PDU_ID_REGISTER_NOTIFICATION; 909 packet[pos++] = 0; 910 uint16_t remainig_outgoing_buffer_size = size > (value_len + 2 + 1) ? size - (value_len + 2 + 1): 0; 911 uint16_t caped_value_len = value_len > remainig_outgoing_buffer_size ? remainig_outgoing_buffer_size : value_len; 912 big_endian_store_16(packet, pos, caped_value_len); 913 pos += 2; 914 packet[pos++] = notification_id; 915 916 memcpy(packet+pos, value, caped_value_len); 917 pos += caped_value_len; 918 connection->wait_to_send = 0; 919 return l2cap_send_prepared(cid, pos); 920 } 921 922 static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 923 avrcp_connection_t * connection; 924 switch (packet_type) { 925 case L2CAP_DATA_PACKET: 926 connection = get_avrcp_connection_for_l2cap_signaling_cid(channel, &avrcp_target_context); 927 if (!connection) break; 928 avrcp_handle_l2cap_data_packet_for_signaling_connection(connection, packet, size); 929 break; 930 case HCI_EVENT_PACKET: 931 switch (hci_event_packet_get_type(packet)){ 932 case L2CAP_EVENT_CAN_SEND_NOW:{ 933 connection = get_avrcp_connection_for_l2cap_signaling_cid(channel, &avrcp_target_context); 934 if (!connection) break; 935 936 if (connection->abort_continue_response){ 937 connection->abort_continue_response = 0; 938 connection->now_playing_info_response = 0; 939 avrcp_target_abort_continue_response(connection->l2cap_signaling_cid, connection); 940 } 941 942 if (connection->now_playing_info_response){ 943 connection->now_playing_info_response = 0; 944 avrcp_target_send_now_playing_info(connection->l2cap_signaling_cid, connection); 945 break; 946 } 947 break; 948 949 if (connection->track_changed){ 950 connection->track_changed = 0; 951 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED, connection->track_id, 8); 952 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 953 break; 954 } 955 956 if (connection->playback_status_changed){ 957 connection->playback_status_changed = 0; 958 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED, &connection->playback_status_changed, 1); 959 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 960 break; 961 } 962 963 if (connection->playing_content_changed){ 964 connection->playing_content_changed = 0; 965 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED, NULL, 0); 966 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 967 break; 968 } 969 970 if (connection->battery_status_changed){ 971 connection->battery_status_changed = 0; 972 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED, (uint8_t *)&connection->battery_status, 1); 973 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 974 break; 975 } 976 977 if (connection->volume_percentage_changed){ 978 connection->volume_percentage_changed = 0; 979 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED, &connection->volume_percentage, 1); 980 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 981 break; 982 } 983 984 switch (connection->state){ 985 case AVCTP_W2_SEND_RESPONSE: 986 connection->state = AVCTP_CONNECTION_OPENED; 987 // if (connection->now_playing_info_response){ 988 // connection->now_playing_info_response = 0; 989 // avrcp_target_send_now_playing_info(connection->l2cap_signaling_cid, connection); 990 // break; 991 // } 992 avrcp_target_send_response(connection->l2cap_signaling_cid, connection); 993 break; 994 default: 995 return; 996 } 997 break; 998 } 999 default: 1000 avrcp_packet_handler(packet_type, channel, packet, size, &avrcp_target_context); 1001 break; 1002 } 1003 default: 1004 break; 1005 } 1006 } 1007 1008 void avrcp_target_init(void){ 1009 avrcp_target_context.role = AVRCP_TARGET; 1010 avrcp_target_context.connections = NULL; 1011 avrcp_target_context.packet_handler = avrcp_controller_packet_handler; 1012 l2cap_register_service(&avrcp_controller_packet_handler, BLUETOOTH_PROTOCOL_AVCTP, 0xffff, LEVEL_0); 1013 } 1014 1015 void avrcp_target_register_packet_handler(btstack_packet_handler_t callback){ 1016 if (callback == NULL){ 1017 log_error("avrcp_register_packet_handler called with NULL callback"); 1018 return; 1019 } 1020 avrcp_target_context.avrcp_callback = callback; 1021 } 1022 1023 uint8_t avrcp_target_connect(bd_addr_t bd_addr, uint16_t * avrcp_cid){ 1024 return avrcp_connect(bd_addr, &avrcp_target_context, avrcp_cid); 1025 } 1026 1027 uint8_t avrcp_target_disconnect(uint16_t avrcp_cid){ 1028 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(avrcp_cid, &avrcp_target_context); 1029 if (!connection){ 1030 log_error("avrcp_get_capabilities: could not find a connection."); 1031 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 1032 } 1033 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 1034 l2cap_disconnect(connection->l2cap_signaling_cid, 0); 1035 return ERROR_CODE_SUCCESS; 1036 } 1037 1038