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 avrcp_context_t avrcp_target_context; 55 56 static int avrcp_target_supports_browsing(uint16_t target_supported_features){ 57 return target_supported_features & (1 << AVRCP_TARGET_SUPPORTED_FEATURE_BROWSING); 58 } 59 60 void avrcp_target_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint16_t supported_features, const char * service_name, const char * service_provider_name){ 61 avrcp_create_sdp_record(0, service, service_record_handle, avrcp_target_supports_browsing(supported_features), supported_features, service_name, service_provider_name); 62 } 63 64 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){ 65 btstack_assert(callback != NULL); 66 67 uint8_t event[8]; 68 int pos = 0; 69 event[pos++] = HCI_EVENT_AVRCP_META; 70 event[pos++] = sizeof(event) - 2; 71 event[pos++] = AVRCP_SUBEVENT_OPERATION; 72 little_endian_store_16(event, pos, avrcp_cid); 73 pos += 2; 74 event[pos++] = operation_id; 75 event[pos++] = operands_length; 76 event[pos++] = operand; 77 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 78 } 79 80 static void avrcp_target_emit_volume_changed(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t absolute_volume){ 81 btstack_assert(callback != NULL); 82 83 uint8_t event[7]; 84 int offset = 0; 85 event[offset++] = HCI_EVENT_AVRCP_META; 86 event[offset++] = sizeof(event) - 2; 87 event[offset++] = AVRCP_SUBEVENT_NOTIFICATION_VOLUME_CHANGED; 88 little_endian_store_16(event, offset, avrcp_cid); 89 offset += 2; 90 event[offset++] = AVRCP_CTYPE_NOTIFY; 91 event[offset++] = absolute_volume; 92 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 93 } 94 95 static void avrcp_target_emit_respond_vendor_dependent_query(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t subevent_id){ 96 btstack_assert(callback != NULL); 97 98 uint8_t event[5]; 99 int pos = 0; 100 event[pos++] = HCI_EVENT_AVRCP_META; 101 event[pos++] = sizeof(event) - 2; 102 event[pos++] = subevent_id; 103 little_endian_store_16(event, pos, avrcp_cid); 104 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 105 } 106 107 // returns number of bytes stored 108 static uint16_t avrcp_target_pack_single_element_header(uint8_t * packet, uint16_t pos, avrcp_media_attribute_id_t attr_id, uint16_t attr_value_size){ 109 btstack_assert(attr_id >= 1); 110 btstack_assert(attr_id <= AVRCP_MEDIA_ATTR_COUNT); 111 112 big_endian_store_32(packet, pos, attr_id); 113 big_endian_store_16(packet, pos+4, RFC2978_CHARSET_MIB_UTF8); 114 big_endian_store_16(packet, pos+6, attr_value_size); 115 return 8; 116 } 117 118 // returns number of bytes stored 119 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){ 120 uint16_t attr_value_length = sprintf((char *)(packet+pos+8), "%0" PRIu32, value); 121 (void) avrcp_target_pack_single_element_header(packet, pos, attr_id, attr_value_length); 122 return 8 + attr_value_length; 123 } 124 125 // returns number of bytes stored 126 static uint16_t avrcp_target_pack_single_element_attribute_string_fragment(uint8_t * packet, uint16_t pos, avrcp_media_attribute_id_t attr_id, uint8_t * attr_value, uint16_t attr_value_to_copy, uint16_t attr_value_size, bool header){ 127 if (attr_value_size == 0) return 0; 128 uint16_t bytes_stored = 0; 129 if (header){ 130 bytes_stored += avrcp_target_pack_single_element_header(packet, pos, attr_id, attr_value_size); 131 } 132 (void)memcpy(packet + pos + bytes_stored, attr_value, attr_value_to_copy); 133 bytes_stored += attr_value_to_copy; 134 return bytes_stored; 135 } 136 137 static int avrcp_target_abort_continue_response(uint16_t cid, avrcp_connection_t * connection){ 138 uint16_t pos = 0; 139 l2cap_reserve_packet_buffer(); 140 uint8_t * packet = l2cap_get_outgoing_buffer(); 141 142 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 143 connection->command_type = AVRCP_CTYPE_RESPONSE_ACCEPTED; 144 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 145 connection->subunit_id = AVRCP_SUBUNIT_ID; 146 147 packet[pos++] = (connection->transaction_label << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 148 // Profile IDentifier (PID) 149 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 150 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 151 152 // command_type 153 packet[pos++] = connection->command_type; 154 // subunit_type | subunit ID 155 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 156 // opcode 157 packet[pos++] = (uint8_t)connection->command_opcode; 158 159 // company id is 3 bytes long 160 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 161 pos += 3; 162 163 packet[pos++] = AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE; 164 165 // reserve byte for packet type 166 packet[pos++] = AVRCP_SINGLE_PACKET; 167 big_endian_store_16(packet, pos, 0); 168 pos += 2; 169 return l2cap_send_prepared(cid, pos); 170 } 171 172 static int avrcp_target_send_now_playing_info(uint16_t cid, avrcp_connection_t * connection){ 173 uint16_t pos = 0; 174 l2cap_reserve_packet_buffer(); 175 uint8_t * packet = l2cap_get_outgoing_buffer(); 176 uint16_t size = l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid); 177 178 packet[pos++] = (connection->transaction_label << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 179 // Profile IDentifier (PID) 180 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 181 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 182 183 // command_type 184 packet[pos++] = connection->command_type; 185 // subunit_type | subunit ID 186 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 187 // opcode 188 packet[pos++] = (uint8_t)connection->command_opcode; 189 190 // company id is 3 bytes long 191 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 192 pos += 3; 193 194 packet[pos++] = AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES; 195 196 // reserve byte for packet type 197 uint8_t pos_packet_type = pos; 198 pos++; 199 200 uint16_t playing_info_buffer_len_position = pos; 201 pos += 2; 202 if (connection->next_attr_id == AVRCP_MEDIA_ATTR_NONE){ 203 packet[pos_packet_type] = AVRCP_SINGLE_PACKET; 204 connection->packet_type = AVRCP_SINGLE_PACKET; 205 packet[pos++] = count_set_bits_uint32(connection->now_playing_info_attr_bitmap); 206 connection->next_attr_id = AVRCP_MEDIA_ATTR_ALL; 207 } 208 209 uint8_t fragmented = 0; 210 int num_free_bytes = size - pos - 2; 211 uint8_t MAX_NUMBER_ATTR_LEN = 10; 212 213 while (!fragmented && (num_free_bytes > 0) && (connection->next_attr_id <= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS)){ 214 avrcp_media_attribute_id_t attr_id = connection->next_attr_id; 215 int attr_index = attr_id - 1; 216 217 if (connection->now_playing_info_attr_bitmap & (1 << attr_id)){ 218 int num_written_bytes = 0; 219 int num_bytes_to_write = 0; 220 switch (attr_id){ 221 case AVRCP_MEDIA_ATTR_ALL: 222 case AVRCP_MEDIA_ATTR_NONE: 223 break; 224 case AVRCP_MEDIA_ATTR_TRACK: 225 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 226 if (num_free_bytes >= num_bytes_to_write){ 227 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->track_nr); 228 break; 229 } 230 fragmented = 1; 231 connection->attribute_value_offset = 0; 232 break; 233 case AVRCP_MEDIA_ATTR_TOTAL_NUM_ITEMS: 234 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 235 if (num_free_bytes >= num_bytes_to_write){ 236 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->total_tracks); 237 break; 238 } 239 fragmented = 1; 240 connection->attribute_value_offset = 0; 241 break; 242 case AVRCP_MEDIA_ATTR_SONG_LENGTH_MS: 243 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 244 if (num_free_bytes >= num_bytes_to_write){ 245 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->song_length_ms); 246 break; 247 } 248 fragmented = 1; 249 connection->attribute_value_offset = 0; 250 break; 251 default:{ 252 bool header = connection->attribute_value_offset == 0; 253 uint8_t * attr_value = (uint8_t *) (connection->now_playing_info[attr_index].value + connection->attribute_value_offset); 254 uint16_t attr_value_len = connection->now_playing_info[attr_index].len - connection->attribute_value_offset; 255 256 num_bytes_to_write = attr_value_len + (header * AVRCP_ATTR_HEADER_LEN); 257 if (num_bytes_to_write <= num_free_bytes){ 258 connection->attribute_value_offset = 0; 259 num_written_bytes = num_bytes_to_write; 260 avrcp_target_pack_single_element_attribute_string_fragment(packet, pos, attr_id, attr_value, attr_value_len, connection->now_playing_info[attr_index].len, header); 261 break; 262 } 263 fragmented = 1; 264 num_written_bytes = num_free_bytes; 265 attr_value_len = num_free_bytes - (header * AVRCP_ATTR_HEADER_LEN); 266 avrcp_target_pack_single_element_attribute_string_fragment(packet, pos, attr_id, attr_value, attr_value_len, connection->now_playing_info[attr_index].len, header); 267 connection->attribute_value_offset += attr_value_len; 268 break; 269 } 270 } 271 pos += num_written_bytes; 272 num_free_bytes -= num_written_bytes; 273 } 274 if (!fragmented){ 275 // C++ compatible version of connection->next_attr_id++ 276 connection->next_attr_id = (avrcp_media_attribute_id_t) (((int) connection->next_attr_id) + 1); 277 } 278 } 279 280 if (fragmented){ 281 switch (connection->packet_type){ 282 case AVRCP_SINGLE_PACKET: 283 connection->packet_type = AVRCP_START_PACKET; 284 break; 285 default: 286 connection->packet_type = AVRCP_CONTINUE_PACKET; 287 break; 288 } 289 } else { 290 if (connection->next_attr_id >= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS){ // DONE 291 if (connection->packet_type != AVRCP_SINGLE_PACKET){ 292 connection->packet_type = AVRCP_END_PACKET; 293 } 294 } 295 } 296 packet[pos_packet_type] = connection->packet_type; 297 // store attr value length 298 big_endian_store_16(packet, playing_info_buffer_len_position, pos - playing_info_buffer_len_position - 2); 299 return l2cap_send_prepared(cid, size); 300 } 301 302 303 304 static int avrcp_target_send_response(uint16_t cid, avrcp_connection_t * connection){ 305 int pos = 0; 306 l2cap_reserve_packet_buffer(); 307 uint8_t * packet = l2cap_get_outgoing_buffer(); 308 309 // transport header 310 // Transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 311 312 // TODO: check for fragmentation 313 connection->packet_type = AVRCP_SINGLE_PACKET; 314 315 packet[pos++] = (connection->transaction_label << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 316 // Profile IDentifier (PID) 317 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 318 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 319 // command_type 320 packet[pos++] = connection->command_type; 321 // subunit_type | subunit ID 322 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 323 // opcode 324 packet[pos++] = (uint8_t)connection->command_opcode; 325 326 (void)memcpy(packet + pos, connection->cmd_operands, 327 connection->cmd_operands_length); 328 pos += connection->cmd_operands_length; 329 330 connection->wait_to_send = false; 331 return l2cap_send_prepared(cid, pos); 332 } 333 334 static void avrcp_target_response_setup(avrcp_connection_t * connection, avrcp_command_type_t command_type, avrcp_subunit_type_t subunit_type, avrcp_subunit_id_t subunit_id, 335 avrcp_command_opcode_t opcode){ 336 connection->command_type = command_type; 337 connection->subunit_type = subunit_type; 338 connection->subunit_id = subunit_id; 339 connection->command_opcode = opcode; 340 } 341 342 static uint8_t avrcp_target_response_accept(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 status){ 343 // AVRCP_CTYPE_RESPONSE_REJECTED 344 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, subunit_type, subunit_id, opcode); 345 // company id is 3 bytes long 346 int pos = connection->cmd_operands_length; 347 connection->cmd_operands[pos++] = pdu_id; 348 connection->cmd_operands[pos++] = 0; 349 // param length 350 big_endian_store_16(connection->cmd_operands, pos, 1); 351 pos += 2; 352 connection->cmd_operands[pos++] = status; 353 connection->cmd_operands_length = pos; 354 connection->accept_response = 1; 355 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 356 return ERROR_CODE_SUCCESS; 357 } 358 359 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){ 360 // AVRCP_CTYPE_RESPONSE_REJECTED 361 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_REJECTED, subunit_type, subunit_id, opcode); 362 // company id is 3 bytes long 363 int pos = connection->cmd_operands_length; 364 connection->cmd_operands[pos++] = pdu_id; 365 connection->cmd_operands[pos++] = 0; 366 // param length 367 big_endian_store_16(connection->cmd_operands, pos, 1); 368 pos += 2; 369 connection->cmd_operands[pos++] = status; 370 connection->cmd_operands_length = pos; 371 connection->state = AVCTP_W2_SEND_RESPONSE; 372 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 373 return ERROR_CODE_SUCCESS; 374 } 375 376 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){ 377 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_NOT_IMPLEMENTED, subunit_type, subunit_id, opcode); 378 // company id is 3 bytes long 379 int pos = connection->cmd_operands_length; 380 connection->cmd_operands[pos++] = pdu_id; 381 connection->cmd_operands[pos++] = 0; 382 // param length 383 big_endian_store_16(connection->cmd_operands, pos, 1); 384 pos += 2; 385 connection->cmd_operands[pos++] = event_id; 386 connection->cmd_operands_length = pos; 387 388 connection->state = AVCTP_W2_SEND_RESPONSE; 389 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 390 return ERROR_CODE_SUCCESS; 391 } 392 393 static uint8_t avrcp_target_response_vendor_dependent_interim(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t event_id, const uint8_t * value, uint16_t value_len){ 394 395 // company id is 3 bytes long 396 int pos = connection->cmd_operands_length; 397 connection->cmd_operands[pos++] = pdu_id; 398 connection->cmd_operands[pos++] = 0; 399 // param length 400 big_endian_store_16(connection->cmd_operands, pos, 1 + value_len); 401 pos += 2; 402 connection->cmd_operands[pos++] = event_id; 403 if (value && (value_len > 0)){ 404 (void)memcpy(connection->cmd_operands + pos, value, value_len); 405 pos += value_len; 406 } 407 connection->cmd_operands_length = pos; 408 connection->state = AVCTP_W2_SEND_RESPONSE; 409 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 410 return ERROR_CODE_SUCCESS; 411 } 412 413 static uint8_t avrcp_target_response_addressed_player_changed_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){ 414 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 415 416 // company id is 3 bytes long 417 int pos = connection->cmd_operands_length; 418 connection->cmd_operands[pos++] = pdu_id; 419 connection->cmd_operands[pos++] = 0; 420 // param length 421 big_endian_store_16(connection->cmd_operands, pos, 5); 422 pos += 2; 423 connection->cmd_operands[pos++] = AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED; 424 big_endian_read_16( &connection->cmd_operands[pos], connection->addressed_player_id); 425 pos += 2; 426 big_endian_read_16( &connection->cmd_operands[pos], connection->uid_counter); 427 pos += 2; 428 429 connection->cmd_operands_length = pos; 430 connection->state = AVCTP_W2_SEND_RESPONSE; 431 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 432 return ERROR_CODE_SUCCESS; 433 } 434 435 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){ 436 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 437 if (!connection){ 438 log_error("Could not find a connection."); 439 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 440 } 441 avrcp_target_response_setup(connection, cmd_type, AVRCP_SUBUNIT_TYPE_PANEL, AVRCP_SUBUNIT_ID, AVRCP_CMD_OPCODE_PASS_THROUGH); 442 443 int pos = 0; 444 connection->cmd_operands[pos++] = opid; 445 connection->cmd_operands[pos++] = operands_length; 446 if (operands_length == 1){ 447 connection->cmd_operands[pos++] = operand; 448 } 449 connection->cmd_operands_length = pos; 450 451 connection->state = AVCTP_W2_SEND_RESPONSE; 452 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 453 return ERROR_CODE_SUCCESS; 454 } 455 456 uint8_t avrcp_target_operation_rejected(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 457 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_REJECTED, opid, operands_length, operand); 458 } 459 460 uint8_t avrcp_target_operation_accepted(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 461 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 462 } 463 464 uint8_t avrcp_target_operation_not_implemented(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 465 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 466 } 467 468 void avrcp_target_set_unit_info(uint16_t avrcp_cid, avrcp_subunit_type_t unit_type, uint32_t company_id){ 469 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 470 if (!connection){ 471 log_error("avrcp_target_set_unit_info: could not find a connection."); 472 return; 473 } 474 connection->unit_type = unit_type; 475 connection->company_id = company_id; 476 } 477 478 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){ 479 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 480 if (!connection){ 481 log_error("avrcp_target_set_subunit_info: could not find a connection."); 482 return; 483 } 484 connection->subunit_info_type = subunit_type; 485 connection->subunit_info_data = subunit_info_data; 486 connection->subunit_info_data_size = subunit_info_data_size; 487 } 488 489 static uint8_t avrcp_target_unit_info(avrcp_connection_t * connection){ 490 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 491 492 uint8_t unit = 0; 493 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 494 connection->subunit_type = AVRCP_SUBUNIT_TYPE_UNIT; //vendor unique 495 connection->subunit_id = AVRCP_SUBUNIT_ID_IGNORE; 496 connection->command_opcode = AVRCP_CMD_OPCODE_UNIT_INFO; 497 498 connection->cmd_operands_length = 5; 499 connection->cmd_operands[0] = 0x07; 500 connection->cmd_operands[1] = (connection->unit_type << 4) | unit; 501 // company id is 3 bytes long 502 big_endian_store_32(connection->cmd_operands, 2, connection->company_id); 503 504 connection->state = AVCTP_W2_SEND_RESPONSE; 505 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 506 return ERROR_CODE_SUCCESS; 507 } 508 509 510 static uint8_t avrcp_target_subunit_info(avrcp_connection_t * connection, uint8_t offset){ 511 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 512 if ((offset - 4) > connection->subunit_info_data_size) return AVRCP_STATUS_INVALID_PARAMETER; 513 514 connection->command_opcode = AVRCP_CMD_OPCODE_SUBUNIT_INFO; 515 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 516 connection->subunit_type = AVRCP_SUBUNIT_TYPE_UNIT; //vendor unique 517 connection->subunit_id = AVRCP_SUBUNIT_ID_IGNORE; 518 // printf("avrcp_target_subunit_info subunit_type %d\n", connection->subunit_type); 519 520 uint8_t page = offset / 4; 521 uint8_t extension_code = 7; 522 connection->cmd_operands_length = 5; 523 connection->cmd_operands[0] = (page << 4) | extension_code; 524 525 (void)memcpy(connection->cmd_operands + 1, 526 connection->subunit_info_data + offset, 4); 527 528 connection->state = AVCTP_W2_SEND_RESPONSE; 529 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 530 return ERROR_CODE_SUCCESS; 531 } 532 533 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){ 534 *out_connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 535 if (!*out_connection){ 536 log_error("avrcp tartget: could not find a connection."); 537 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 538 } 539 540 if ((*out_connection)->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 541 (*out_connection)->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 542 (*out_connection)->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 543 (*out_connection)->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 544 (*out_connection)->subunit_id = AVRCP_SUBUNIT_ID; 545 546 (*out_connection)->cmd_operands[(*out_connection)->cmd_operands_length++] = pdu_id; 547 // reserved 548 (*out_connection)->cmd_operands[(*out_connection)->cmd_operands_length++] = 0; 549 // param length 550 big_endian_store_16((*out_connection)->cmd_operands, (*out_connection)->cmd_operands_length, param_length); 551 (*out_connection)->cmd_operands_length += 2; 552 return ERROR_CODE_SUCCESS; 553 } 554 555 static uint8_t avrcp_target_capability(uint16_t avrcp_cid, avrcp_capability_id_t capability_id, uint8_t num_capabilities, uint8_t * capabilities, uint8_t capabilities_size){ 556 avrcp_connection_t * connection = NULL; 557 uint8_t status = avrcp_prepare_vendor_dependent_response(avrcp_cid, &connection, AVRCP_PDU_ID_GET_CAPABILITIES, 2 + capabilities_size); 558 if (status != ERROR_CODE_SUCCESS) return status; 559 560 connection->cmd_operands[connection->cmd_operands_length++] = capability_id; 561 connection->cmd_operands[connection->cmd_operands_length++] = num_capabilities; 562 (void)memcpy(connection->cmd_operands + connection->cmd_operands_length, 563 capabilities, capabilities_size); 564 connection->cmd_operands_length += capabilities_size; 565 566 connection->state = AVCTP_W2_SEND_RESPONSE; 567 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 568 return ERROR_CODE_SUCCESS; 569 } 570 571 uint8_t avrcp_target_supported_events(uint16_t avrcp_cid, uint8_t num_event_ids, uint8_t * event_ids, uint8_t event_ids_size){ 572 return avrcp_target_capability(avrcp_cid, AVRCP_CAPABILITY_ID_EVENT, num_event_ids, event_ids, event_ids_size); 573 } 574 575 uint8_t avrcp_target_supported_companies(uint16_t avrcp_cid, uint8_t num_company_ids, uint8_t * company_ids, uint8_t company_ids_size){ 576 return avrcp_target_capability(avrcp_cid, AVRCP_CAPABILITY_ID_COMPANY, num_company_ids, company_ids, company_ids_size); 577 } 578 579 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){ 580 avrcp_connection_t * connection = NULL; 581 uint8_t status = avrcp_prepare_vendor_dependent_response(avrcp_cid, &connection, AVRCP_PDU_ID_GET_PLAY_STATUS, 11); 582 if (status != ERROR_CODE_SUCCESS) return status; 583 584 big_endian_store_32(connection->cmd_operands, connection->cmd_operands_length, song_length_ms); 585 connection->cmd_operands_length += 4; 586 big_endian_store_32(connection->cmd_operands, connection->cmd_operands_length, song_position_ms); 587 connection->cmd_operands_length += 4; 588 connection->cmd_operands[connection->cmd_operands_length++] = play_status; 589 590 connection->state = AVCTP_W2_SEND_RESPONSE; 591 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 592 return ERROR_CODE_SUCCESS; 593 } 594 595 static uint8_t avrcp_target_now_playing_info(avrcp_connection_t * connection){ 596 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 597 connection->now_playing_info_response = 1; 598 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 599 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 600 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 601 connection->subunit_id = AVRCP_SUBUNIT_ID; 602 603 connection->state = AVCTP_W2_SEND_RESPONSE; 604 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 605 return ERROR_CODE_SUCCESS; 606 } 607 608 static uint8_t avrcp_target_store_media_attr(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id, const char * value){ 609 int index = attr_id - 1; 610 if (!value) return AVRCP_STATUS_INVALID_PARAMETER; 611 connection->now_playing_info[index].value = (uint8_t*)value; 612 connection->now_playing_info[index].len = strlen(value); 613 // printf("store %lu bytes, %s\n", strlen(value), value); 614 return ERROR_CODE_SUCCESS; 615 } 616 617 uint8_t avrcp_target_set_playback_status(uint16_t avrcp_cid, avrcp_playback_status_t playback_status){ 618 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 619 if (!connection){ 620 log_error("avrcp_unit_info: could not find a connection."); 621 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 622 } 623 if (connection->playback_status == playback_status) return ERROR_CODE_SUCCESS; 624 625 connection->playback_status = playback_status; 626 connection->playback_status_changed = 1; 627 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 628 return ERROR_CODE_SUCCESS; 629 } 630 631 void avrcp_target_set_now_playing_info(uint16_t avrcp_cid, const avrcp_track_t * current_track, uint16_t total_tracks){ 632 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 633 if (!connection){ 634 log_error("avrcp_unit_info: could not find a connection. cid 0x%02x\n", avrcp_cid); 635 return; 636 } 637 if (!current_track){ 638 connection->track_selected = 0; 639 connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR; 640 return; 641 } 642 (void)memcpy(connection->track_id, current_track->track_id, 8); 643 connection->song_length_ms = current_track->song_length_ms; 644 connection->track_nr = current_track->track_nr; 645 connection->total_tracks = total_tracks; 646 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_TITLE, current_track->title); 647 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ARTIST, current_track->artist); 648 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ALBUM, current_track->album); 649 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_GENRE, current_track->genre); 650 connection->track_selected = 1; 651 652 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 653 connection->track_changed = 1; 654 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 655 } 656 return; 657 } 658 659 uint8_t avrcp_target_track_changed(uint16_t avrcp_cid, uint8_t * track_id){ 660 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 661 if (!connection){ 662 log_error("avrcp_target_track_changed: could not find connection."); 663 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 664 } 665 if (!track_id) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 666 667 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 668 connection->track_changed = 1; 669 (void)memcpy(connection->track_id, track_id, 8); 670 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 671 } 672 return ERROR_CODE_SUCCESS; 673 } 674 675 uint8_t avrcp_target_playing_content_changed(uint16_t avrcp_cid){ 676 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 677 if (!connection){ 678 log_error("avrcp_target_playing_content_changed: could not find a connection."); 679 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 680 } 681 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED)) { 682 connection->playing_content_changed = 1; 683 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 684 } 685 return ERROR_CODE_SUCCESS; 686 } 687 688 uint8_t avrcp_target_addressed_player_changed(uint16_t avrcp_cid, uint16_t player_id, uint16_t uid_counter){ 689 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 690 if (!connection){ 691 log_error("avrcp_unit_info: could not find a connection."); 692 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 693 } 694 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED)) { 695 connection->uid_counter = uid_counter; 696 connection->addressed_player_id = player_id; 697 } 698 return ERROR_CODE_SUCCESS; 699 } 700 701 uint8_t avrcp_target_battery_status_changed(uint16_t avrcp_cid, avrcp_battery_status_t battery_status){ 702 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 703 if (!connection){ 704 log_error("avrcp_unit_info: could not find a connection."); 705 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 706 } 707 if (connection->battery_status == battery_status) return ERROR_CODE_SUCCESS; 708 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED)) { 709 connection->battery_status = battery_status; 710 connection->battery_status_changed = 1; 711 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 712 } 713 return ERROR_CODE_SUCCESS; 714 } 715 716 uint8_t avrcp_target_volume_changed(uint16_t avrcp_cid, uint8_t volume_percentage){ 717 avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 718 if (!connection){ 719 log_error("avrcp_unit_info: could not find a connection."); 720 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 721 } 722 connection->volume_percentage = volume_percentage; 723 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED )) { 724 connection->notify_volume_percentage_changed = 1; 725 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 726 } 727 return ERROR_CODE_SUCCESS; 728 } 729 730 static void avrcp_target_set_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification, uint8_t transaction_label){ 731 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return; 732 connection->notifications_transaction_label[notification] = transaction_label; 733 } 734 735 static uint8_t avrcp_target_get_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification){ 736 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return 0; 737 return connection->notifications_transaction_label[notification]; 738 } 739 740 static uint8_t * avrcp_get_company_id(uint8_t *packet, uint16_t size){ 741 UNUSED(size); 742 return packet + 6; 743 } 744 745 static uint8_t * avrcp_get_pdu(uint8_t *packet, uint16_t size){ 746 UNUSED(size); 747 return packet + 9; 748 } 749 750 static uint8_t avrcp_is_receive_pass_through_cmd(uint8_t operation_id){ 751 return operation_id & 0x80; 752 } 753 754 static void avrcp_handle_l2cap_data_packet_for_signaling_connection(avrcp_connection_t * connection, uint8_t *packet, uint16_t size){ 755 UNUSED(connection); 756 UNUSED(packet); 757 UNUSED(size); 758 759 uint16_t pid = 0; 760 uint8_t transport_header = packet[0]; 761 connection->transaction_label = transport_header >> 4; 762 763 avrcp_packet_type_t packet_type = (avrcp_packet_type_t) ((transport_header & 0x0F) >> 2); 764 switch (packet_type){ 765 case AVRCP_SINGLE_PACKET: 766 pid = big_endian_read_16(packet, 1); 767 break; 768 case AVRCP_START_PACKET: 769 pid = big_endian_read_16(packet, 2); 770 break; 771 default: 772 break; 773 } 774 775 switch (packet_type){ 776 case AVRCP_SINGLE_PACKET: 777 case AVRCP_START_PACKET: 778 if (pid != BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL){ 779 log_info("Invalid pid 0x%02x, expected 0x%02x", connection->invalid_pid, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL); 780 connection->reject_transport_header = 1; 781 connection->invalid_pid = pid; 782 connection->transport_header = (connection->transaction_label << 4) | (AVRCP_SINGLE_PACKET << 2 ) | (AVRCP_RESPONSE_FRAME << 1) | 1; 783 connection->state = AVCTP_W2_SEND_RESPONSE; 784 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 785 return; 786 } 787 break; 788 default: 789 break; 790 } 791 792 avrcp_subunit_type_t subunit_type = (avrcp_subunit_type_t) (packet[4] >> 3); 793 avrcp_subunit_id_t subunit_id = (avrcp_subunit_id_t) (packet[4] & 0x07); 794 795 avrcp_command_opcode_t opcode = (avrcp_command_opcode_t) avrcp_cmd_opcode(packet,size); 796 uint8_t * company_id = avrcp_get_company_id(packet, size); 797 uint8_t * pdu = avrcp_get_pdu(packet, size); 798 799 int pos = 4; 800 uint16_t length; 801 avrcp_pdu_id_t pdu_id; 802 connection->cmd_operands_length = 0; 803 804 switch (opcode){ 805 case AVRCP_CMD_OPCODE_UNIT_INFO: 806 avrcp_target_unit_info(connection); 807 break; 808 case AVRCP_CMD_OPCODE_SUBUNIT_INFO:{ 809 uint8_t offset = 4 * (packet[pos+2]>>4); 810 avrcp_target_subunit_info(connection, offset); 811 break; 812 } 813 case AVRCP_CMD_OPCODE_PASS_THROUGH:{ 814 log_info("AVRCP_OPERATION_ID 0x%02x, operands length %d, operand %d", packet[6], packet[7], packet[8]); 815 avrcp_operation_id_t operation_id = (avrcp_operation_id_t) packet[6]; 816 817 if (avrcp_is_receive_pass_through_cmd(operation_id)){ 818 operation_id = (avrcp_operation_id_t) (packet[6] & 0x7F); 819 avrcp_target_operation_accepted(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], packet[8]); 820 break; 821 } 822 823 switch (operation_id){ 824 case AVRCP_OPERATION_ID_PLAY: 825 case AVRCP_OPERATION_ID_PAUSE: 826 case AVRCP_OPERATION_ID_STOP: 827 case AVRCP_OPERATION_ID_VOLUME_UP: 828 case AVRCP_OPERATION_ID_VOLUME_DOWN: 829 case AVRCP_OPERATION_ID_REWIND: 830 case AVRCP_OPERATION_ID_FAST_FORWARD: 831 case AVRCP_OPERATION_ID_FORWARD: 832 case AVRCP_OPERATION_ID_BACKWARD: 833 case AVRCP_OPERATION_ID_SKIP: 834 case AVRCP_OPERATION_ID_MUTE: 835 case AVRCP_OPERATION_ID_CHANNEL_UP: 836 case AVRCP_OPERATION_ID_CHANNEL_DOWN: 837 case AVRCP_OPERATION_ID_SELECT: 838 case AVRCP_OPERATION_ID_UP: 839 case AVRCP_OPERATION_ID_DOWN: 840 case AVRCP_OPERATION_ID_LEFT: 841 case AVRCP_OPERATION_ID_RIGHT: 842 case AVRCP_OPERATION_ID_ROOT_MENU: 843 avrcp_target_operation_accepted(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], packet[8]); 844 avrcp_target_emit_operation(avrcp_target_context.avrcp_callback, connection->avrcp_cid, operation_id, packet[7], packet[8]); 845 break; 846 case AVRCP_OPERATION_ID_UNDEFINED: 847 avrcp_target_operation_not_implemented(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], packet[8]); 848 return; 849 default: 850 avrcp_target_operation_not_implemented(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], packet[8]); 851 return; 852 } 853 break; 854 } 855 856 case AVRCP_CMD_OPCODE_VENDOR_DEPENDENT: 857 pdu_id = (avrcp_pdu_id_t) pdu[0]; 858 // 1 - reserved 859 // 2-3 param length, 860 length = big_endian_read_16(pdu, 2); 861 (void)memcpy(connection->cmd_operands, company_id, 3); 862 connection->cmd_operands_length = 3; 863 switch (pdu_id){ 864 case AVRCP_PDU_ID_SET_ADDRESSED_PLAYER:{ 865 bool ok = length == 4; 866 if (avrcp_target_context.set_addressed_player_callback != NULL){ 867 uint16_t player_id = big_endian_read_16(pdu, 4); 868 ok = avrcp_target_context.set_addressed_player_callback(player_id); 869 } 870 if (ok){ 871 avrcp_target_response_accept(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_SUCCESS); 872 } else { 873 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PLAYER_ID); 874 } 875 break; 876 } 877 case AVRCP_PDU_ID_GET_CAPABILITIES:{ 878 avrcp_capability_id_t capability_id = (avrcp_capability_id_t) pdu[pos]; 879 switch (capability_id){ 880 case AVRCP_CAPABILITY_ID_EVENT: 881 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_EVENT_IDS_QUERY); 882 break; 883 case AVRCP_CAPABILITY_ID_COMPANY: 884 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_COMPANY_IDS_QUERY); 885 break; 886 default: 887 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 888 break; 889 } 890 break; 891 } 892 case AVRCP_PDU_ID_GET_PLAY_STATUS: 893 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_PLAY_STATUS_QUERY); 894 break; 895 case AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE: 896 connection->cmd_operands[0] = pdu[4]; 897 connection->abort_continue_response = 1; 898 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 899 break; 900 case AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE: 901 if (pdu[4] != AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES){ 902 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 903 return; 904 } 905 connection->now_playing_info_response = 1; 906 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 907 break; 908 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES:{ 909 uint8_t play_identifier[8]; 910 memset(play_identifier, 0, 8); 911 if (memcmp(pdu+pos, play_identifier, 8) != 0) { 912 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 913 return; 914 } 915 pos += 8; 916 uint8_t attribute_count = pdu[pos++]; 917 // printf("AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES attribute count %d\n", attribute_count); 918 connection->next_attr_id = AVRCP_MEDIA_ATTR_NONE; 919 if (!attribute_count){ 920 connection->now_playing_info_attr_bitmap = 0xFE; 921 } else { 922 int i; 923 connection->now_playing_info_attr_bitmap = 0; 924 for (i=0; i < attribute_count; i++){ 925 uint16_t attr_id = big_endian_read_16(pdu, pos); 926 pos += 2; 927 connection->now_playing_info_attr_bitmap |= (1 << attr_id); 928 } 929 } 930 log_info("now_playing_info_attr_bitmap 0x%02x", connection->now_playing_info_attr_bitmap); 931 avrcp_target_now_playing_info(connection); 932 break; 933 } 934 case AVRCP_PDU_ID_REGISTER_NOTIFICATION:{ 935 // 0 - pdu id 936 // 1 - reserved 937 // 2-3 param length 938 avrcp_notification_event_id_t event_id = (avrcp_notification_event_id_t) pdu[4]; 939 uint16_t event_mask = (1 << event_id); 940 avrcp_target_set_transaction_label_for_notification(connection, event_id, connection->transaction_label); 941 942 switch (event_id){ 943 case AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED: 944 connection->notifications_enabled |= event_mask; 945 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 946 if (connection->track_selected){ 947 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_SELECTED, 8); 948 } else { 949 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_NOT_SELECTED, 8); 950 } 951 break; 952 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED: 953 connection->notifications_enabled |= event_mask; 954 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 955 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->playback_status, 1); 956 break; 957 case AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED: 958 connection->notifications_enabled |= event_mask; 959 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 960 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, NULL, 0); 961 break; 962 case AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED: 963 connection->notify_volume_percentage_changed = 0; 964 connection->notifications_enabled |= event_mask; 965 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 966 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->volume_percentage, 1); 967 break; 968 case AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: 969 connection->notifications_enabled |= event_mask; 970 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 971 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->battery_status, 1); 972 break; 973 case AVRCP_NOTIFICATION_EVENT_AVAILABLE_PLAYERS_CHANGED: 974 case AVRCP_NOTIFICATION_EVENT_PLAYER_APPLICATION_SETTING_CHANGED: 975 case AVRCP_NOTIFICATION_EVENT_UIDS_CHANGED: 976 avrcp_target_response_not_implemented(connection, subunit_type, subunit_id, opcode, pdu_id, event_id); 977 return; 978 case AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED: 979 connection->notifications_enabled |= event_mask; 980 avrcp_target_response_addressed_player_changed_interim(connection, subunit_type, subunit_id, opcode, pdu_id); 981 return; 982 default: 983 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 984 return; 985 } 986 break; 987 } 988 case AVRCP_PDU_ID_SET_ABSOLUTE_VOLUME: { 989 if (length != 1){ 990 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 991 break; 992 } 993 994 uint8_t absolute_volume = pdu[4]; 995 if (absolute_volume < 0x80){ 996 connection->volume_percentage = absolute_volume; 997 } 998 avrcp_target_response_accept(connection, subunit_type, subunit_id, opcode, pdu_id, connection->volume_percentage); 999 avrcp_target_emit_volume_changed(avrcp_target_context.avrcp_callback, connection->avrcp_cid, connection->volume_percentage); 1000 break; 1001 } 1002 default: 1003 log_info("AVRCP target: unhandled pdu id 0x%02x", pdu_id); 1004 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1005 break; 1006 } 1007 break; 1008 default: 1009 log_info("AVRCP target: opcode 0x%02x not implemented", avrcp_cmd_opcode(packet,size)); 1010 break; 1011 } 1012 } 1013 1014 static int avrcp_target_send_notification(uint16_t cid, avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id, uint8_t * value, uint16_t value_len){ 1015 if (!connection){ 1016 log_error("avrcp tartget: could not find a connection."); 1017 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 1018 } 1019 1020 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 1021 connection->command_type = AVRCP_CTYPE_RESPONSE_CHANGED_STABLE; 1022 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 1023 connection->subunit_id = AVRCP_SUBUNIT_ID; 1024 connection->transaction_label = avrcp_target_get_transaction_label_for_notification(connection, notification_id); 1025 1026 uint16_t pos = 0; 1027 l2cap_reserve_packet_buffer(); 1028 uint8_t * packet = l2cap_get_outgoing_buffer(); 1029 uint16_t size = l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid); 1030 1031 connection->packet_type = AVRCP_SINGLE_PACKET; 1032 packet[pos++] = (connection->transaction_label << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 1033 // Profile IDentifier (PID) 1034 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 1035 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 1036 1037 // command_type 1038 packet[pos++] = connection->command_type; 1039 // subunit_type | subunit ID 1040 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 1041 // opcode 1042 packet[pos++] = (uint8_t)connection->command_opcode; 1043 1044 // company id is 3 bytes long 1045 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 1046 pos += 3; 1047 1048 packet[pos++] = AVRCP_PDU_ID_REGISTER_NOTIFICATION; 1049 packet[pos++] = 0; 1050 uint16_t remainig_outgoing_buffer_size = size - pos - 2; 1051 1052 uint16_t caped_value_len = btstack_min(value_len + 1, remainig_outgoing_buffer_size); 1053 big_endian_store_16(packet, pos, caped_value_len); 1054 pos += 2; 1055 packet[pos++] = notification_id; 1056 (void)memcpy(packet + pos, value, caped_value_len - 1); 1057 pos += caped_value_len - 1; 1058 connection->wait_to_send = false; 1059 return l2cap_send_prepared(cid, pos); 1060 } 1061 1062 static void avrcp_target_reset_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id){ 1063 if (!connection){ 1064 log_error("avrcp tartget: could not find a connection."); 1065 return; 1066 } 1067 connection->notifications_enabled &= ~(1 << notification_id); 1068 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 1069 avrcp_target_set_transaction_label_for_notification(connection, notification_id, 0); 1070 } 1071 1072 static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1073 avrcp_connection_t * connection; 1074 switch (packet_type) { 1075 case L2CAP_DATA_PACKET: 1076 connection = get_avrcp_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1077 avrcp_handle_l2cap_data_packet_for_signaling_connection(connection, packet, size); 1078 break; 1079 case HCI_EVENT_PACKET: 1080 switch (hci_event_packet_get_type(packet)){ 1081 case L2CAP_EVENT_CAN_SEND_NOW:{ 1082 connection = get_avrcp_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1083 1084 if (connection->accept_response){ 1085 connection->accept_response = 0; 1086 avrcp_target_send_response(connection->l2cap_signaling_cid, connection); 1087 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1088 break; 1089 } 1090 1091 else if (connection->abort_continue_response){ 1092 connection->abort_continue_response = 0; 1093 connection->now_playing_info_response = 0; 1094 avrcp_target_abort_continue_response(connection->l2cap_signaling_cid, connection); 1095 break; 1096 } 1097 1098 else if (connection->now_playing_info_response){ 1099 connection->now_playing_info_response = 0; 1100 avrcp_target_send_now_playing_info(connection->l2cap_signaling_cid, connection); 1101 break; 1102 } 1103 1104 else if (connection->track_changed){ 1105 connection->track_changed = 0; 1106 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED, connection->track_id, 8); 1107 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED); 1108 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1109 break; 1110 } 1111 1112 else if (connection->playback_status_changed){ 1113 connection->playback_status_changed = 0; 1114 uint8_t playback_status = (uint8_t) connection->playback_status; 1115 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED, &playback_status, 1); 1116 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED); 1117 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1118 break; 1119 } 1120 1121 else if (connection->playing_content_changed){ 1122 connection->playing_content_changed = 0; 1123 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED, NULL, 0); 1124 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED); 1125 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1126 break; 1127 } 1128 1129 else if (connection->battery_status_changed){ 1130 connection->battery_status_changed = 0; 1131 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED, (uint8_t *)&connection->battery_status, 1); 1132 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED); 1133 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1134 break; 1135 } 1136 1137 else if (connection->notify_volume_percentage_changed){ 1138 // printf("emit new volume %d\n", connection->volume_percentage); 1139 connection->notify_volume_percentage_changed = 0; 1140 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED, &connection->volume_percentage, 1); 1141 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED); 1142 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1143 break; 1144 } 1145 1146 else if (connection->reject_transport_header){ 1147 connection->state = AVCTP_CONNECTION_OPENED; 1148 connection->reject_transport_header = 0; 1149 l2cap_reserve_packet_buffer(); 1150 uint8_t * out_buffer = l2cap_get_outgoing_buffer(); 1151 out_buffer[0] = connection->transport_header; 1152 big_endian_store_16(out_buffer, 1, connection->invalid_pid); 1153 l2cap_send_prepared(connection->l2cap_signaling_cid, 3); 1154 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1155 break; 1156 } 1157 1158 switch (connection->state){ 1159 case AVCTP_W2_SEND_RESPONSE: 1160 connection->state = AVCTP_CONNECTION_OPENED; 1161 avrcp_target_send_response(connection->l2cap_signaling_cid, connection); 1162 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1163 return; 1164 default: 1165 break; 1166 } 1167 1168 break; 1169 } 1170 default: 1171 break; 1172 } 1173 default: 1174 break; 1175 } 1176 } 1177 1178 void avrcp_target_init(void){ 1179 avrcp_target_context.role = AVRCP_TARGET; 1180 avrcp_target_context.packet_handler = avrcp_target_packet_handler; 1181 avrcp_register_target_packet_handler(&avrcp_target_packet_handler); 1182 } 1183 1184 void avrcp_target_register_packet_handler(btstack_packet_handler_t callback){ 1185 btstack_assert(callback != NULL); 1186 avrcp_target_context.avrcp_callback = callback; 1187 } 1188 1189 void avrcp_target_register_set_addressed_player_handler(bool (*callback)(uint16_t player_id)){ 1190 btstack_assert(callback != NULL); 1191 avrcp_target_context.set_addressed_player_callback = callback; 1192 } 1193 1194 1195