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 <string.h> 43 #include <inttypes.h> 44 45 #include "classic/avrcp.h" 46 #include "classic/avrcp_target.h" 47 48 #include "bluetooth_sdp.h" 49 #include "btstack_debug.h" 50 #include "btstack_event.h" 51 #include "btstack_util.h" 52 #include "l2cap.h" 53 54 #define AVRCP_ATTR_HEADER_LEN 8 55 56 static const uint8_t AVRCP_NOTIFICATION_TRACK_SELECTED[] = {0,0,0,0,0,0,0,0}; 57 static const uint8_t AVRCP_NOTIFICATION_TRACK_NOT_SELECTED[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; 58 59 avrcp_context_t avrcp_target_context; 60 61 static int avrcp_target_supports_browsing(uint16_t target_supported_features){ 62 return target_supported_features & AVRCP_FEATURE_MASK_BROWSING; 63 } 64 65 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){ 66 avrcp_create_sdp_record(0, service, service_record_handle, avrcp_target_supports_browsing(supported_features), supported_features, service_name, service_provider_name); 67 } 68 69 static void 70 avrcp_target_emit_operation(btstack_packet_handler_t callback, uint16_t avrcp_cid, avrcp_operation_id_t operation_id, 71 bool button_pressed, uint8_t operands_length, uint8_t operand) { 72 btstack_assert(callback != NULL); 73 74 uint8_t event[9]; 75 int pos = 0; 76 event[pos++] = HCI_EVENT_AVRCP_META; 77 event[pos++] = sizeof(event) - 2; 78 event[pos++] = AVRCP_SUBEVENT_OPERATION; 79 little_endian_store_16(event, pos, avrcp_cid); 80 pos += 2; 81 event[pos++] = operation_id; 82 event[pos++] = button_pressed ? 1 : 0; 83 event[pos++] = operands_length; 84 event[pos++] = operand; 85 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 86 } 87 88 static void avrcp_target_emit_volume_changed(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t absolute_volume){ 89 btstack_assert(callback != NULL); 90 91 uint8_t event[7]; 92 int offset = 0; 93 event[offset++] = HCI_EVENT_AVRCP_META; 94 event[offset++] = sizeof(event) - 2; 95 event[offset++] = AVRCP_SUBEVENT_NOTIFICATION_VOLUME_CHANGED; 96 little_endian_store_16(event, offset, avrcp_cid); 97 offset += 2; 98 event[offset++] = AVRCP_CTYPE_NOTIFY; 99 event[offset++] = absolute_volume; 100 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 101 } 102 103 static void avrcp_target_emit_respond_vendor_dependent_query(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t subevent_id){ 104 btstack_assert(callback != NULL); 105 106 uint8_t event[5]; 107 int pos = 0; 108 event[pos++] = HCI_EVENT_AVRCP_META; 109 event[pos++] = sizeof(event) - 2; 110 event[pos++] = subevent_id; 111 little_endian_store_16(event, pos, avrcp_cid); 112 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 113 } 114 115 // returns number of bytes stored 116 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){ 117 btstack_assert(attr_id >= 1); 118 btstack_assert(attr_id <= AVRCP_MEDIA_ATTR_COUNT); 119 120 big_endian_store_32(packet, pos, attr_id); 121 big_endian_store_16(packet, pos+4, RFC2978_CHARSET_MIB_UTF8); 122 big_endian_store_16(packet, pos+6, attr_value_size); 123 return 8; 124 } 125 126 // returns number of bytes stored 127 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){ 128 uint16_t attr_value_length = sprintf((char *)(packet+pos+8), "%0" PRIu32, value); 129 (void) avrcp_target_pack_single_element_header(packet, pos, attr_id, attr_value_length); 130 return 8 + attr_value_length; 131 } 132 133 // returns number of bytes stored 134 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){ 135 if (attr_value_size == 0) return 0; 136 uint16_t bytes_stored = 0; 137 if (header){ 138 bytes_stored += avrcp_target_pack_single_element_header(packet, pos, attr_id, attr_value_size); 139 } 140 (void)memcpy(packet + pos + bytes_stored, attr_value, attr_value_to_copy); 141 bytes_stored += attr_value_to_copy; 142 return bytes_stored; 143 } 144 145 static int avrcp_target_abort_continue_response(uint16_t cid, avrcp_connection_t * connection){ 146 uint16_t pos = 0; 147 l2cap_reserve_packet_buffer(); 148 uint8_t * packet = l2cap_get_outgoing_buffer(); 149 150 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 151 connection->command_type = AVRCP_CTYPE_RESPONSE_ACCEPTED; 152 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 153 connection->subunit_id = AVRCP_SUBUNIT_ID; 154 155 packet[pos++] = (connection->transaction_id << 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_REQUEST_ABORT_CONTINUING_RESPONSE; 172 173 // reserve byte for packet type 174 packet[pos++] = AVRCP_SINGLE_PACKET; 175 big_endian_store_16(packet, pos, 0); 176 pos += 2; 177 return l2cap_send_prepared(cid, pos); 178 } 179 180 static int avrcp_target_send_now_playing_info(uint16_t cid, avrcp_connection_t * connection){ 181 uint16_t pos = 0; 182 l2cap_reserve_packet_buffer(); 183 uint8_t * packet = l2cap_get_outgoing_buffer(); 184 uint16_t size = l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid); 185 186 packet[pos++] = (connection->transaction_id << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 187 // Profile IDentifier (PID) 188 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 189 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 190 191 // command_type 192 packet[pos++] = connection->command_type; 193 // subunit_type | subunit ID 194 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 195 // opcode 196 packet[pos++] = (uint8_t)connection->command_opcode; 197 198 // company id is 3 bytes long 199 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 200 pos += 3; 201 202 packet[pos++] = AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES; 203 204 // reserve byte for packet type 205 uint8_t pos_packet_type = pos; 206 pos++; 207 208 uint16_t playing_info_buffer_len_position = pos; 209 pos += 2; 210 if (connection->next_attr_id == AVRCP_MEDIA_ATTR_NONE){ 211 packet[pos_packet_type] = AVRCP_SINGLE_PACKET; 212 connection->packet_type = AVRCP_SINGLE_PACKET; 213 packet[pos++] = count_set_bits_uint32(connection->now_playing_info_attr_bitmap); 214 connection->next_attr_id = AVRCP_MEDIA_ATTR_ALL; 215 } 216 217 uint8_t fragmented = 0; 218 int num_free_bytes = size - pos - 2; 219 uint8_t MAX_NUMBER_ATTR_LEN = 10; 220 221 while (!fragmented && (num_free_bytes > 0) && (connection->next_attr_id <= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS)){ 222 avrcp_media_attribute_id_t attr_id = connection->next_attr_id; 223 int attr_index = attr_id - 1; 224 225 if (connection->now_playing_info_attr_bitmap & (1 << attr_id)){ 226 int num_written_bytes = 0; 227 int num_bytes_to_write = 0; 228 switch (attr_id){ 229 case AVRCP_MEDIA_ATTR_ALL: 230 case AVRCP_MEDIA_ATTR_NONE: 231 break; 232 case AVRCP_MEDIA_ATTR_TRACK: 233 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 234 if (num_free_bytes >= num_bytes_to_write){ 235 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->track_nr); 236 break; 237 } 238 fragmented = 1; 239 connection->attribute_value_offset = 0; 240 break; 241 case AVRCP_MEDIA_ATTR_TOTAL_NUM_ITEMS: 242 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 243 if (num_free_bytes >= num_bytes_to_write){ 244 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->total_tracks); 245 break; 246 } 247 fragmented = 1; 248 connection->attribute_value_offset = 0; 249 break; 250 case AVRCP_MEDIA_ATTR_SONG_LENGTH_MS: 251 num_bytes_to_write = AVRCP_ATTR_HEADER_LEN + MAX_NUMBER_ATTR_LEN; 252 if (num_free_bytes >= num_bytes_to_write){ 253 num_written_bytes = avrcp_target_pack_single_element_attribute_number(packet, pos, attr_id, connection->song_length_ms); 254 break; 255 } 256 fragmented = 1; 257 connection->attribute_value_offset = 0; 258 break; 259 default:{ 260 bool header = connection->attribute_value_offset == 0; 261 uint8_t * attr_value = (uint8_t *) (connection->now_playing_info[attr_index].value + connection->attribute_value_offset); 262 uint16_t attr_value_len = connection->now_playing_info[attr_index].len - connection->attribute_value_offset; 263 264 num_bytes_to_write = attr_value_len + (header * AVRCP_ATTR_HEADER_LEN); 265 if (num_bytes_to_write <= num_free_bytes){ 266 connection->attribute_value_offset = 0; 267 num_written_bytes = num_bytes_to_write; 268 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); 269 break; 270 } 271 fragmented = 1; 272 num_written_bytes = num_free_bytes; 273 attr_value_len = num_free_bytes - (header * AVRCP_ATTR_HEADER_LEN); 274 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); 275 connection->attribute_value_offset += attr_value_len; 276 break; 277 } 278 } 279 pos += num_written_bytes; 280 num_free_bytes -= num_written_bytes; 281 } 282 if (!fragmented){ 283 // C++ compatible version of connection->next_attr_id++ 284 connection->next_attr_id = (avrcp_media_attribute_id_t) (((int) connection->next_attr_id) + 1); 285 } 286 } 287 288 if (fragmented){ 289 switch (connection->packet_type){ 290 case AVRCP_SINGLE_PACKET: 291 connection->packet_type = AVRCP_START_PACKET; 292 break; 293 default: 294 connection->packet_type = AVRCP_CONTINUE_PACKET; 295 break; 296 } 297 } else { 298 if (connection->next_attr_id >= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS){ // DONE 299 if (connection->packet_type != AVRCP_SINGLE_PACKET){ 300 connection->packet_type = AVRCP_END_PACKET; 301 } 302 } 303 } 304 packet[pos_packet_type] = connection->packet_type; 305 // store attr value length 306 big_endian_store_16(packet, playing_info_buffer_len_position, pos - playing_info_buffer_len_position - 2); 307 return l2cap_send_prepared(cid, size); 308 } 309 310 311 312 static int avrcp_target_send_response(uint16_t cid, avrcp_connection_t * connection){ 313 int pos = 0; 314 l2cap_reserve_packet_buffer(); 315 uint8_t * packet = l2cap_get_outgoing_buffer(); 316 317 // transport header 318 // Transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 319 320 // TODO: check for fragmentation 321 connection->packet_type = AVRCP_SINGLE_PACKET; 322 323 packet[pos++] = (connection->transaction_id << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 324 // Profile IDentifier (PID) 325 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 326 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 327 // command_type 328 packet[pos++] = connection->command_type; 329 // subunit_type | subunit ID 330 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 331 // opcode 332 packet[pos++] = (uint8_t)connection->command_opcode; 333 334 (void)memcpy(packet + pos, connection->cmd_operands, 335 connection->cmd_operands_length); 336 pos += connection->cmd_operands_length; 337 338 return l2cap_send_prepared(cid, pos); 339 } 340 341 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, 342 avrcp_command_opcode_t opcode){ 343 connection->command_type = command_type; 344 connection->subunit_type = subunit_type; 345 connection->subunit_id = subunit_id; 346 connection->command_opcode = opcode; 347 } 348 349 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){ 350 // AVRCP_CTYPE_RESPONSE_REJECTED 351 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, subunit_type, subunit_id, opcode); 352 // company id is 3 bytes long 353 int pos = connection->cmd_operands_length; 354 connection->cmd_operands[pos++] = pdu_id; 355 connection->cmd_operands[pos++] = 0; 356 // param length 357 big_endian_store_16(connection->cmd_operands, pos, 1); 358 pos += 2; 359 connection->cmd_operands[pos++] = status; 360 connection->cmd_operands_length = pos; 361 connection->accept_response = 1; 362 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 363 return ERROR_CODE_SUCCESS; 364 } 365 366 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){ 367 // AVRCP_CTYPE_RESPONSE_REJECTED 368 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_REJECTED, subunit_type, subunit_id, opcode); 369 // company id is 3 bytes long 370 int pos = connection->cmd_operands_length; 371 connection->cmd_operands[pos++] = pdu_id; 372 connection->cmd_operands[pos++] = 0; 373 // param length 374 big_endian_store_16(connection->cmd_operands, pos, 1); 375 pos += 2; 376 connection->cmd_operands[pos++] = status; 377 connection->cmd_operands_length = pos; 378 connection->state = AVCTP_W2_SEND_RESPONSE; 379 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 380 return ERROR_CODE_SUCCESS; 381 } 382 383 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){ 384 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_NOT_IMPLEMENTED, subunit_type, subunit_id, opcode); 385 // company id is 3 bytes long 386 int pos = connection->cmd_operands_length; 387 connection->cmd_operands[pos++] = pdu_id; 388 connection->cmd_operands[pos++] = 0; 389 // param length 390 big_endian_store_16(connection->cmd_operands, pos, 1); 391 pos += 2; 392 connection->cmd_operands[pos++] = event_id; 393 connection->cmd_operands_length = pos; 394 395 connection->state = AVCTP_W2_SEND_RESPONSE; 396 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 397 return ERROR_CODE_SUCCESS; 398 } 399 400 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){ 401 402 // company id is 3 bytes long 403 int pos = connection->cmd_operands_length; 404 connection->cmd_operands[pos++] = pdu_id; 405 connection->cmd_operands[pos++] = 0; 406 // param length 407 big_endian_store_16(connection->cmd_operands, pos, 1 + value_len); 408 pos += 2; 409 connection->cmd_operands[pos++] = event_id; 410 if (value && (value_len > 0)){ 411 (void)memcpy(connection->cmd_operands + pos, value, value_len); 412 pos += value_len; 413 } 414 connection->cmd_operands_length = pos; 415 connection->state = AVCTP_W2_SEND_RESPONSE; 416 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 417 return ERROR_CODE_SUCCESS; 418 } 419 420 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){ 421 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 422 423 // company id is 3 bytes long 424 int pos = connection->cmd_operands_length; 425 connection->cmd_operands[pos++] = pdu_id; 426 connection->cmd_operands[pos++] = 0; 427 // param length 428 big_endian_store_16(connection->cmd_operands, pos, 5); 429 pos += 2; 430 connection->cmd_operands[pos++] = AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED; 431 big_endian_read_16( &connection->cmd_operands[pos], connection->addressed_player_id); 432 pos += 2; 433 big_endian_read_16( &connection->cmd_operands[pos], connection->uid_counter); 434 pos += 2; 435 436 connection->cmd_operands_length = pos; 437 connection->state = AVCTP_W2_SEND_RESPONSE; 438 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 439 return ERROR_CODE_SUCCESS; 440 } 441 442 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){ 443 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 444 if (!connection){ 445 log_error("Could not find a connection."); 446 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 447 } 448 avrcp_target_response_setup(connection, cmd_type, AVRCP_SUBUNIT_TYPE_PANEL, AVRCP_SUBUNIT_ID, AVRCP_CMD_OPCODE_PASS_THROUGH); 449 450 int pos = 0; 451 connection->cmd_operands[pos++] = opid; 452 connection->cmd_operands[pos++] = operands_length; 453 if (operands_length == 1){ 454 connection->cmd_operands[pos++] = operand; 455 } 456 connection->cmd_operands_length = pos; 457 458 connection->state = AVCTP_W2_SEND_RESPONSE; 459 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 460 return ERROR_CODE_SUCCESS; 461 } 462 463 uint8_t avrcp_target_operation_rejected(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 464 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_REJECTED, opid, operands_length, operand); 465 } 466 467 uint8_t avrcp_target_operation_accepted(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 468 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 469 } 470 471 uint8_t avrcp_target_operation_not_implemented(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 472 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 473 } 474 475 void avrcp_target_set_unit_info(uint16_t avrcp_cid, avrcp_subunit_type_t unit_type, uint32_t company_id){ 476 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 477 if (!connection){ 478 log_error("avrcp_target_set_unit_info: could not find a connection."); 479 return; 480 } 481 connection->unit_type = unit_type; 482 connection->company_id = company_id; 483 } 484 485 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){ 486 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 487 if (!connection){ 488 log_error("avrcp_target_set_subunit_info: could not find a connection."); 489 return; 490 } 491 connection->subunit_info_type = subunit_type; 492 connection->subunit_info_data = subunit_info_data; 493 connection->subunit_info_data_size = subunit_info_data_size; 494 } 495 496 static uint8_t avrcp_target_unit_info(avrcp_connection_t * connection){ 497 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 498 499 uint8_t unit = 0; 500 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 501 connection->subunit_type = AVRCP_SUBUNIT_TYPE_UNIT; //vendor unique 502 connection->subunit_id = AVRCP_SUBUNIT_ID_IGNORE; 503 connection->command_opcode = AVRCP_CMD_OPCODE_UNIT_INFO; 504 505 connection->cmd_operands_length = 5; 506 connection->cmd_operands[0] = 0x07; 507 connection->cmd_operands[1] = (connection->unit_type << 4) | unit; 508 // company id is 3 bytes long 509 big_endian_store_32(connection->cmd_operands, 2, connection->company_id); 510 511 connection->state = AVCTP_W2_SEND_RESPONSE; 512 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 513 return ERROR_CODE_SUCCESS; 514 } 515 516 517 static uint8_t avrcp_target_subunit_info(avrcp_connection_t * connection, uint8_t offset){ 518 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 519 if ((offset - 4) > connection->subunit_info_data_size) return AVRCP_STATUS_INVALID_PARAMETER; 520 521 connection->command_opcode = AVRCP_CMD_OPCODE_SUBUNIT_INFO; 522 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 523 connection->subunit_type = AVRCP_SUBUNIT_TYPE_UNIT; //vendor unique 524 connection->subunit_id = AVRCP_SUBUNIT_ID_IGNORE; 525 526 uint8_t page = offset / 4; 527 uint8_t extension_code = 7; 528 connection->cmd_operands_length = 5; 529 connection->cmd_operands[0] = (page << 4) | extension_code; 530 531 (void)memcpy(connection->cmd_operands + 1, 532 connection->subunit_info_data + offset, 4); 533 534 connection->state = AVCTP_W2_SEND_RESPONSE; 535 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 536 return ERROR_CODE_SUCCESS; 537 } 538 539 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){ 540 *out_connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 541 if (!*out_connection){ 542 log_error("avrcp tartget: could not find a connection."); 543 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 544 } 545 546 if ((*out_connection)->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 547 (*out_connection)->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 548 (*out_connection)->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 549 (*out_connection)->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 550 (*out_connection)->subunit_id = AVRCP_SUBUNIT_ID; 551 552 (*out_connection)->cmd_operands[(*out_connection)->cmd_operands_length++] = pdu_id; 553 // reserved 554 (*out_connection)->cmd_operands[(*out_connection)->cmd_operands_length++] = 0; 555 // param length 556 big_endian_store_16((*out_connection)->cmd_operands, (*out_connection)->cmd_operands_length, param_length); 557 (*out_connection)->cmd_operands_length += 2; 558 return ERROR_CODE_SUCCESS; 559 } 560 561 static uint8_t avrcp_target_capability(uint16_t avrcp_cid, avrcp_capability_id_t capability_id, uint8_t num_capabilities, const uint8_t *capabilities, uint8_t capabilities_size){ 562 avrcp_connection_t * connection = NULL; 563 uint8_t status = avrcp_prepare_vendor_dependent_response(avrcp_cid, &connection, AVRCP_PDU_ID_GET_CAPABILITIES, 2 + capabilities_size); 564 if (status != ERROR_CODE_SUCCESS) return status; 565 566 connection->cmd_operands[connection->cmd_operands_length++] = capability_id; 567 connection->cmd_operands[connection->cmd_operands_length++] = num_capabilities; 568 (void)memcpy(connection->cmd_operands + connection->cmd_operands_length, 569 capabilities, capabilities_size); 570 connection->cmd_operands_length += capabilities_size; 571 572 connection->state = AVCTP_W2_SEND_RESPONSE; 573 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 574 return ERROR_CODE_SUCCESS; 575 } 576 577 uint8_t avrcp_target_supported_events(uint16_t avrcp_cid, uint8_t num_event_ids, const uint8_t *event_ids, uint8_t event_ids_size){ 578 return avrcp_target_capability(avrcp_cid, AVRCP_CAPABILITY_ID_EVENT, num_event_ids, event_ids, event_ids_size); 579 } 580 581 uint8_t avrcp_target_supported_companies(uint16_t avrcp_cid, uint8_t num_company_ids, const uint8_t *company_ids, uint8_t company_ids_size){ 582 return avrcp_target_capability(avrcp_cid, AVRCP_CAPABILITY_ID_COMPANY, num_company_ids, company_ids, company_ids_size); 583 } 584 585 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){ 586 avrcp_connection_t * connection = NULL; 587 uint8_t status = avrcp_prepare_vendor_dependent_response(avrcp_cid, &connection, AVRCP_PDU_ID_GET_PLAY_STATUS, 11); 588 if (status != ERROR_CODE_SUCCESS) return status; 589 590 big_endian_store_32(connection->cmd_operands, connection->cmd_operands_length, song_length_ms); 591 connection->cmd_operands_length += 4; 592 big_endian_store_32(connection->cmd_operands, connection->cmd_operands_length, song_position_ms); 593 connection->cmd_operands_length += 4; 594 connection->cmd_operands[connection->cmd_operands_length++] = play_status; 595 596 connection->state = AVCTP_W2_SEND_RESPONSE; 597 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 598 return ERROR_CODE_SUCCESS; 599 } 600 601 static uint8_t avrcp_target_now_playing_info(avrcp_connection_t * connection){ 602 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 603 connection->now_playing_info_response = 1; 604 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 605 connection->command_type = AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE; 606 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 607 connection->subunit_id = AVRCP_SUBUNIT_ID; 608 609 connection->state = AVCTP_W2_SEND_RESPONSE; 610 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 611 return ERROR_CODE_SUCCESS; 612 } 613 614 static uint8_t avrcp_target_store_media_attr(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id, const char * value){ 615 int index = attr_id - 1; 616 if (!value) return AVRCP_STATUS_INVALID_PARAMETER; 617 connection->now_playing_info[index].value = (uint8_t*)value; 618 connection->now_playing_info[index].len = strlen(value); 619 return ERROR_CODE_SUCCESS; 620 } 621 622 uint8_t avrcp_target_set_playback_status(uint16_t avrcp_cid, avrcp_playback_status_t playback_status){ 623 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 624 if (!connection){ 625 log_error("avrcp_unit_info: could not find a connection."); 626 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 627 } 628 if (connection->playback_status == playback_status) return ERROR_CODE_SUCCESS; 629 630 connection->playback_status = playback_status; 631 connection->playback_status_changed = 1; 632 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 633 return ERROR_CODE_SUCCESS; 634 } 635 636 void avrcp_target_set_now_playing_info(uint16_t avrcp_cid, const avrcp_track_t * current_track, uint16_t total_tracks){ 637 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 638 if (!connection){ 639 log_error("avrcp_unit_info: could not find a connection. cid 0x%02x\n", avrcp_cid); 640 return; 641 } 642 if (!current_track){ 643 connection->track_selected = 0; 644 connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR; 645 return; 646 } 647 (void)memcpy(connection->track_id, current_track->track_id, 8); 648 connection->song_length_ms = current_track->song_length_ms; 649 connection->track_nr = current_track->track_nr; 650 connection->total_tracks = total_tracks; 651 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_TITLE, current_track->title); 652 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ARTIST, current_track->artist); 653 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ALBUM, current_track->album); 654 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_GENRE, current_track->genre); 655 connection->track_selected = 1; 656 657 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 658 connection->track_changed = 1; 659 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 660 } 661 return; 662 } 663 664 uint8_t avrcp_target_track_changed(uint16_t avrcp_cid, uint8_t * track_id){ 665 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 666 if (!connection){ 667 log_error("avrcp_target_track_changed: could not find connection."); 668 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 669 } 670 if (!track_id) return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 671 672 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 673 connection->track_changed = 1; 674 (void)memcpy(connection->track_id, track_id, 8); 675 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 676 } 677 return ERROR_CODE_SUCCESS; 678 } 679 680 uint8_t avrcp_target_playing_content_changed(uint16_t avrcp_cid){ 681 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 682 if (!connection){ 683 log_error("avrcp_target_playing_content_changed: could not find a connection."); 684 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 685 } 686 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED)) { 687 connection->playing_content_changed = 1; 688 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 689 } 690 return ERROR_CODE_SUCCESS; 691 } 692 693 uint8_t avrcp_target_addressed_player_changed(uint16_t avrcp_cid, uint16_t player_id, uint16_t uid_counter){ 694 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 695 if (!connection){ 696 log_error("avrcp_unit_info: could not find a connection."); 697 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 698 } 699 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED)) { 700 connection->uid_counter = uid_counter; 701 connection->addressed_player_id = player_id; 702 } 703 return ERROR_CODE_SUCCESS; 704 } 705 706 uint8_t avrcp_target_battery_status_changed(uint16_t avrcp_cid, avrcp_battery_status_t battery_status){ 707 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 708 if (!connection){ 709 log_error("avrcp_unit_info: could not find a connection."); 710 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 711 } 712 if (connection->battery_status == battery_status) return ERROR_CODE_SUCCESS; 713 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED)) { 714 connection->battery_status = battery_status; 715 connection->battery_status_changed = 1; 716 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 717 } 718 return ERROR_CODE_SUCCESS; 719 } 720 721 uint8_t avrcp_target_volume_changed(uint16_t avrcp_cid, uint8_t volume_percentage){ 722 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 723 if (!connection){ 724 log_error("avrcp_unit_info: could not find a connection."); 725 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 726 } 727 connection->volume_percentage = volume_percentage; 728 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED )) { 729 connection->notify_volume_percentage_changed = 1; 730 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 731 } 732 return ERROR_CODE_SUCCESS; 733 } 734 735 static void avrcp_target_set_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification, uint8_t transaction_label){ 736 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return; 737 connection->notifications_transaction_label[notification] = transaction_label; 738 } 739 740 static uint8_t avrcp_target_get_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification){ 741 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return 0; 742 return connection->notifications_transaction_label[notification]; 743 } 744 745 static bool avcrp_operation_id_is_valid(avrcp_operation_id_t operation_id){ 746 if (operation_id < AVRCP_OPERATION_ID_RESERVED_1) return true; 747 748 if (operation_id < AVRCP_OPERATION_ID_0) return false; 749 if (operation_id < AVRCP_OPERATION_ID_RESERVED_2) return true; 750 751 if (operation_id < AVRCP_OPERATION_ID_CHANNEL_UP) return false; 752 if (operation_id < AVRCP_OPERATION_ID_RESERVED_3) return true; 753 754 if (operation_id < AVRCP_OPERATION_ID_CHANNEL_UP) return false; 755 if (operation_id < AVRCP_OPERATION_ID_RESERVED_3) return true; 756 757 if (operation_id < AVRCP_OPERATION_ID_SKIP) return false; 758 if (operation_id == AVRCP_OPERATION_ID_SKIP) return true; 759 760 if (operation_id < AVRCP_OPERATION_ID_POWER) return false; 761 if (operation_id < AVRCP_OPERATION_ID_RESERVED_4) return true; 762 763 if (operation_id < AVRCP_OPERATION_ID_ANGLE) return false; 764 if (operation_id < AVRCP_OPERATION_ID_RESERVED_5) return true; 765 766 if (operation_id < AVRCP_OPERATION_ID_F1) return false; 767 if (operation_id < AVRCP_OPERATION_ID_RESERVED_6) return true; 768 769 return false; 770 } 771 772 static void avrcp_handle_l2cap_data_packet_for_signaling_connection(avrcp_connection_t * connection, uint8_t *packet, uint16_t size){ 773 774 if (size < 6u) return; 775 776 uint16_t pid = 0; 777 uint8_t transport_header = packet[0]; 778 connection->transaction_id = transport_header >> 4; 779 780 avrcp_packet_type_t packet_type = (avrcp_packet_type_t) ((transport_header & 0x0F) >> 2); 781 switch (packet_type){ 782 case AVRCP_SINGLE_PACKET: 783 pid = big_endian_read_16(packet, 1); 784 break; 785 case AVRCP_START_PACKET: 786 pid = big_endian_read_16(packet, 2); 787 break; 788 default: 789 break; 790 } 791 792 switch (packet_type){ 793 case AVRCP_SINGLE_PACKET: 794 case AVRCP_START_PACKET: 795 if (pid != BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL){ 796 log_info("Invalid pid 0x%02x, expected 0x%02x", connection->invalid_pid, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL); 797 connection->reject_transport_header = 1; 798 connection->invalid_pid = pid; 799 connection->transport_header = (connection->transaction_id << 4) | (AVRCP_SINGLE_PACKET << 2 ) | (AVRCP_RESPONSE_FRAME << 1) | 1; 800 connection->state = AVCTP_W2_SEND_RESPONSE; 801 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 802 return; 803 } 804 break; 805 default: 806 break; 807 } 808 809 if (packet_type != AVRCP_SINGLE_PACKET) return; 810 811 avrcp_subunit_type_t subunit_type = (avrcp_subunit_type_t) (packet[4] >> 3); 812 avrcp_subunit_id_t subunit_id = (avrcp_subunit_id_t) (packet[4] & 0x07); 813 814 avrcp_command_opcode_t opcode = (avrcp_command_opcode_t) avrcp_cmd_opcode(packet,size); 815 816 int pos = 6; 817 uint16_t length; 818 avrcp_pdu_id_t pdu_id; 819 connection->cmd_operands_length = 0; 820 uint8_t offset; 821 uint8_t operand; 822 avrcp_operation_id_t operation_id; 823 824 switch (opcode){ 825 case AVRCP_CMD_OPCODE_UNIT_INFO: 826 avrcp_target_unit_info(connection); 827 break; 828 case AVRCP_CMD_OPCODE_SUBUNIT_INFO: 829 if ((size - pos) < 3) return; 830 // page: packet[pos] >> 4, 831 offset = 4 * (packet[pos]>>4); 832 // extension code (fixed 7) = packet[pos] & 0x0F 833 // 4 bytes paga data, all 0xFF 834 avrcp_target_subunit_info(connection, offset); 835 break; 836 837 case AVRCP_CMD_OPCODE_PASS_THROUGH: 838 if (size < 8) return; 839 log_info("AVRCP_OPERATION_ID 0x%02x, operands length %d", packet[6], packet[7]); 840 operation_id = (avrcp_operation_id_t) (packet[6] & 0x7f); 841 operand = 0; 842 if ((packet[7] >= 1) && (size >= 9)){ 843 operand = packet[8]; 844 } 845 846 if (avcrp_operation_id_is_valid(operation_id)){ 847 bool button_pressed = (packet[6] & 0x80) == 0; 848 849 avrcp_target_operation_accepted(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], operand); 850 avrcp_target_emit_operation(avrcp_target_context.avrcp_callback, connection->avrcp_cid, 851 operation_id, button_pressed, packet[7], operand); 852 } else { 853 avrcp_target_operation_not_implemented(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], operand); 854 } 855 break; 856 857 858 case AVRCP_CMD_OPCODE_VENDOR_DEPENDENT: 859 860 if (size < 13) return; 861 862 // pos = 6 - company id 863 (void)memcpy(connection->cmd_operands, &packet[pos], 3); 864 connection->cmd_operands_length = 3; 865 pos += 3; 866 // pos = 9 867 pdu_id = (avrcp_pdu_id_t) packet[pos++]; 868 // 1 - reserved 869 pos++; 870 // 2-3 param length, 871 length = big_endian_read_16(packet, pos); 872 pos += 2; 873 // pos = 13 874 switch (pdu_id){ 875 case AVRCP_PDU_ID_SET_ADDRESSED_PLAYER:{ 876 if ((pos + 2) > size) return; 877 bool ok = length == 4; 878 if (avrcp_target_context.set_addressed_player_callback != NULL){ 879 uint16_t player_id = big_endian_read_16(packet, pos); 880 ok = avrcp_target_context.set_addressed_player_callback(player_id); 881 } 882 if (ok){ 883 avrcp_target_response_accept(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_SUCCESS); 884 } else { 885 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PLAYER_ID); 886 } 887 break; 888 } 889 case AVRCP_PDU_ID_GET_CAPABILITIES:{ 890 avrcp_capability_id_t capability_id = (avrcp_capability_id_t) packet[pos]; 891 switch (capability_id){ 892 case AVRCP_CAPABILITY_ID_EVENT: 893 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_EVENT_IDS_QUERY); 894 break; 895 case AVRCP_CAPABILITY_ID_COMPANY: 896 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_COMPANY_IDS_QUERY); 897 break; 898 default: 899 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 900 break; 901 } 902 break; 903 } 904 case AVRCP_PDU_ID_GET_PLAY_STATUS: 905 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_PLAY_STATUS_QUERY); 906 break; 907 case AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE: 908 if ((pos + 1) > size) return; 909 connection->cmd_operands[0] = packet[pos]; 910 connection->abort_continue_response = 1; 911 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 912 break; 913 case AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE: 914 if ((pos + 1) > size) return; 915 if (packet[pos] != AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES){ 916 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 917 return; 918 } 919 connection->now_playing_info_response = 1; 920 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 921 break; 922 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES:{ 923 if ((pos + 9) > size) return; 924 uint8_t play_identifier[8]; 925 memset(play_identifier, 0, 8); 926 if (memcmp(&packet[pos], play_identifier, 8) != 0) { 927 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 928 return; 929 } 930 pos += 8; 931 uint8_t attribute_count = packet[pos++]; 932 connection->next_attr_id = AVRCP_MEDIA_ATTR_NONE; 933 if (!attribute_count){ 934 connection->now_playing_info_attr_bitmap = 0xFE; 935 } else { 936 int i; 937 connection->now_playing_info_attr_bitmap = 0; 938 if ((pos + attribute_count * 2) > size) return; 939 for (i=0; i < attribute_count; i++){ 940 uint16_t attr_id = big_endian_read_16(packet, pos); 941 pos += 2; 942 connection->now_playing_info_attr_bitmap |= (1 << attr_id); 943 } 944 } 945 log_info("now_playing_info_attr_bitmap 0x%02x", connection->now_playing_info_attr_bitmap); 946 avrcp_target_now_playing_info(connection); 947 break; 948 } 949 case AVRCP_PDU_ID_REGISTER_NOTIFICATION:{ 950 if ((pos + 1) > size) return; 951 avrcp_notification_event_id_t event_id = (avrcp_notification_event_id_t) packet[pos]; 952 uint16_t event_mask = (1 << event_id); 953 avrcp_target_set_transaction_label_for_notification(connection, event_id, connection->transaction_id); 954 955 switch (event_id){ 956 case AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED: 957 connection->notifications_enabled |= event_mask; 958 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 959 if (connection->track_selected){ 960 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_SELECTED, 8); 961 } else { 962 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_NOT_SELECTED, 8); 963 } 964 break; 965 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED: 966 connection->notifications_enabled |= event_mask; 967 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 968 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->playback_status, 1); 969 break; 970 case AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED: 971 connection->notifications_enabled |= event_mask; 972 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 973 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, NULL, 0); 974 break; 975 case AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED: 976 connection->notify_volume_percentage_changed = 0; 977 connection->notifications_enabled |= event_mask; 978 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 979 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->volume_percentage, 1); 980 break; 981 case AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: 982 connection->notifications_enabled |= event_mask; 983 avrcp_target_response_setup(connection, AVRCP_CTYPE_RESPONSE_INTERIM, subunit_type, subunit_id, opcode); 984 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->battery_status, 1); 985 break; 986 case AVRCP_NOTIFICATION_EVENT_AVAILABLE_PLAYERS_CHANGED: 987 case AVRCP_NOTIFICATION_EVENT_PLAYER_APPLICATION_SETTING_CHANGED: 988 case AVRCP_NOTIFICATION_EVENT_UIDS_CHANGED: 989 avrcp_target_response_not_implemented(connection, subunit_type, subunit_id, opcode, pdu_id, event_id); 990 return; 991 case AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED: 992 connection->notifications_enabled |= event_mask; 993 avrcp_target_response_addressed_player_changed_interim(connection, subunit_type, subunit_id, opcode, pdu_id); 994 return; 995 default: 996 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 997 return; 998 } 999 break; 1000 } 1001 case AVRCP_PDU_ID_SET_ABSOLUTE_VOLUME: { 1002 if (length != 1){ 1003 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1004 break; 1005 } 1006 1007 if ((pos + 1) > size) return; 1008 uint8_t absolute_volume = packet[pos]; 1009 if (absolute_volume < 0x80){ 1010 connection->volume_percentage = absolute_volume; 1011 } 1012 avrcp_target_response_accept(connection, subunit_type, subunit_id, opcode, pdu_id, connection->volume_percentage); 1013 avrcp_target_emit_volume_changed(avrcp_target_context.avrcp_callback, connection->avrcp_cid, connection->volume_percentage); 1014 break; 1015 } 1016 default: 1017 log_info("AVRCP target: unhandled pdu id 0x%02x", pdu_id); 1018 avrcp_target_response_reject(connection, subunit_type, subunit_id, opcode, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1019 break; 1020 } 1021 break; 1022 default: 1023 log_info("AVRCP target: opcode 0x%02x not implemented", avrcp_cmd_opcode(packet,size)); 1024 break; 1025 } 1026 } 1027 1028 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){ 1029 if (!connection){ 1030 log_error("avrcp tartget: could not find a connection."); 1031 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 1032 } 1033 1034 btstack_assert((value_len == 0) || (value != NULL)); 1035 1036 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 1037 connection->command_type = AVRCP_CTYPE_RESPONSE_CHANGED_STABLE; 1038 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 1039 connection->subunit_id = AVRCP_SUBUNIT_ID; 1040 connection->transaction_id = avrcp_target_get_transaction_label_for_notification(connection, notification_id); 1041 1042 uint16_t pos = 0; 1043 l2cap_reserve_packet_buffer(); 1044 uint8_t * packet = l2cap_get_outgoing_buffer(); 1045 1046 // value <= 8 ==> pdu <= 22 < L2CAP Default MTU 1047 btstack_assert((14 + value_len) <= l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid)); 1048 1049 connection->packet_type = AVRCP_SINGLE_PACKET; 1050 packet[pos++] = (connection->transaction_id << 4) | (connection->packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 1051 // Profile IDentifier (PID) 1052 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 1053 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 1054 1055 // command_type 1056 packet[pos++] = connection->command_type; 1057 // subunit_type | subunit ID 1058 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 1059 // opcode 1060 packet[pos++] = (uint8_t)connection->command_opcode; 1061 1062 // company id is 3 bytes long 1063 big_endian_store_24(packet, pos, BT_SIG_COMPANY_ID); 1064 pos += 3; 1065 1066 packet[pos++] = AVRCP_PDU_ID_REGISTER_NOTIFICATION; 1067 packet[pos++] = 0; 1068 1069 big_endian_store_16(packet, pos, 1 + value_len); 1070 pos += 2; 1071 packet[pos++] = notification_id; 1072 if (value_len > 0){ 1073 (void)memcpy(packet + pos, value, value_len); 1074 pos += value_len; 1075 } 1076 1077 return l2cap_send_prepared(cid, pos); 1078 } 1079 1080 static void avrcp_target_reset_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id){ 1081 if (!connection){ 1082 log_error("avrcp tartget: could not find a connection."); 1083 return; 1084 } 1085 connection->notifications_enabled &= ~(1 << notification_id); 1086 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 1087 avrcp_target_set_transaction_label_for_notification(connection, notification_id, 0); 1088 } 1089 1090 static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1091 avrcp_connection_t * connection; 1092 switch (packet_type) { 1093 case L2CAP_DATA_PACKET: 1094 connection = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1095 avrcp_handle_l2cap_data_packet_for_signaling_connection(connection, packet, size); 1096 break; 1097 case HCI_EVENT_PACKET: 1098 switch (hci_event_packet_get_type(packet)){ 1099 case L2CAP_EVENT_CAN_SEND_NOW:{ 1100 connection = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1101 1102 if (connection->accept_response){ 1103 connection->accept_response = 0; 1104 avrcp_target_send_response(connection->l2cap_signaling_cid, connection); 1105 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1106 return; 1107 } 1108 1109 if (connection->abort_continue_response){ 1110 connection->abort_continue_response = 0; 1111 connection->now_playing_info_response = 0; 1112 avrcp_target_abort_continue_response(connection->l2cap_signaling_cid, connection); 1113 return; 1114 } 1115 1116 if (connection->now_playing_info_response){ 1117 connection->now_playing_info_response = 0; 1118 avrcp_target_send_now_playing_info(connection->l2cap_signaling_cid, connection); 1119 return; 1120 } 1121 1122 if (connection->track_changed){ 1123 connection->track_changed = 0; 1124 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED, connection->track_id, 8); 1125 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED); 1126 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1127 return; 1128 } 1129 1130 if (connection->playback_status_changed){ 1131 connection->playback_status_changed = 0; 1132 uint8_t playback_status = (uint8_t) connection->playback_status; 1133 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED, &playback_status, 1); 1134 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED); 1135 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1136 return; 1137 } 1138 1139 if (connection->playing_content_changed){ 1140 connection->playing_content_changed = 0; 1141 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED, NULL, 0); 1142 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED); 1143 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1144 return; 1145 } 1146 1147 if (connection->battery_status_changed){ 1148 connection->battery_status_changed = 0; 1149 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED, (uint8_t *)&connection->battery_status, 1); 1150 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED); 1151 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1152 return; 1153 } 1154 1155 if (connection->notify_volume_percentage_changed){ 1156 connection->notify_volume_percentage_changed = 0; 1157 avrcp_target_send_notification(connection->l2cap_signaling_cid, connection, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED, &connection->volume_percentage, 1); 1158 avrcp_target_reset_notification(connection, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED); 1159 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1160 return; 1161 } 1162 1163 if (connection->reject_transport_header){ 1164 connection->state = AVCTP_CONNECTION_OPENED; 1165 connection->reject_transport_header = 0; 1166 l2cap_reserve_packet_buffer(); 1167 uint8_t * out_buffer = l2cap_get_outgoing_buffer(); 1168 out_buffer[0] = connection->transport_header; 1169 big_endian_store_16(out_buffer, 1, connection->invalid_pid); 1170 l2cap_send_prepared(connection->l2cap_signaling_cid, 3); 1171 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1172 return; 1173 } 1174 1175 switch (connection->state){ 1176 case AVCTP_W2_SEND_RESPONSE: 1177 connection->state = AVCTP_CONNECTION_OPENED; 1178 avrcp_target_send_response(connection->l2cap_signaling_cid, connection); 1179 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1180 return; 1181 default: 1182 break; 1183 } 1184 1185 break; 1186 } 1187 default: 1188 break; 1189 } 1190 default: 1191 break; 1192 } 1193 } 1194 1195 void avrcp_target_init(void){ 1196 avrcp_target_context.role = AVRCP_TARGET; 1197 avrcp_target_context.packet_handler = avrcp_target_packet_handler; 1198 avrcp_register_target_packet_handler(&avrcp_target_packet_handler); 1199 } 1200 1201 void avrcp_target_deinit(void){ 1202 memset(&avrcp_target_context, 0, sizeof(avrcp_context_t)); 1203 } 1204 1205 void avrcp_target_register_packet_handler(btstack_packet_handler_t callback){ 1206 btstack_assert(callback != NULL); 1207 avrcp_target_context.avrcp_callback = callback; 1208 } 1209 1210 void avrcp_target_register_set_addressed_player_handler(bool (*callback)(uint16_t player_id)){ 1211 btstack_assert(callback != NULL); 1212 avrcp_target_context.set_addressed_player_callback = callback; 1213 } 1214 1215 1216