1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "avrcp_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 #include <stdio.h> 55 #define AVRCP_ATTR_HEADER_LEN 8 56 57 static const uint8_t AVRCP_NOTIFICATION_TRACK_SELECTED[] = {0,0,0,0,0,0,0,0}; 58 static const uint8_t AVRCP_NOTIFICATION_TRACK_NOT_SELECTED[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; 59 60 avrcp_context_t avrcp_target_context; 61 62 static uint32_t default_companies[] = { 63 0x581900 //BT SIG registered CompanyID 64 }; 65 66 static int avrcp_target_supports_browsing(uint16_t target_supported_features){ 67 return target_supported_features & AVRCP_FEATURE_MASK_BROWSING; 68 } 69 70 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){ 71 avrcp_create_sdp_record(0, service, service_record_handle, avrcp_target_supports_browsing(supported_features), supported_features, service_name, service_provider_name); 72 } 73 74 static void 75 avrcp_target_emit_operation(btstack_packet_handler_t callback, uint16_t avrcp_cid, avrcp_operation_id_t operation_id, 76 bool button_pressed, uint8_t operands_length, uint8_t operand) { 77 btstack_assert(callback != NULL); 78 79 uint8_t event[9]; 80 int pos = 0; 81 event[pos++] = HCI_EVENT_AVRCP_META; 82 event[pos++] = sizeof(event) - 2; 83 event[pos++] = AVRCP_SUBEVENT_OPERATION; 84 little_endian_store_16(event, pos, avrcp_cid); 85 pos += 2; 86 event[pos++] = operation_id; 87 event[pos++] = button_pressed ? 1 : 0; 88 event[pos++] = operands_length; 89 event[pos++] = operand; 90 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 91 } 92 93 static void avrcp_target_emit_volume_changed(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t absolute_volume){ 94 btstack_assert(callback != NULL); 95 96 uint8_t event[7]; 97 int offset = 0; 98 event[offset++] = HCI_EVENT_AVRCP_META; 99 event[offset++] = sizeof(event) - 2; 100 event[offset++] = AVRCP_SUBEVENT_NOTIFICATION_VOLUME_CHANGED; 101 little_endian_store_16(event, offset, avrcp_cid); 102 offset += 2; 103 event[offset++] = AVRCP_CTYPE_NOTIFY; 104 event[offset++] = absolute_volume; 105 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 106 } 107 108 static void avrcp_target_emit_respond_vendor_dependent_query(btstack_packet_handler_t callback, uint16_t avrcp_cid, uint8_t subevent_id){ 109 btstack_assert(callback != NULL); 110 111 uint8_t event[5]; 112 int pos = 0; 113 event[pos++] = HCI_EVENT_AVRCP_META; 114 event[pos++] = sizeof(event) - 2; 115 event[pos++] = subevent_id; 116 little_endian_store_16(event, pos, avrcp_cid); 117 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 118 } 119 120 // returns number of bytes stored 121 static uint16_t avrcp_target_pack_single_element_header(uint8_t * buffer, avrcp_media_attribute_id_t attr_id, uint16_t attr_value_size){ 122 btstack_assert(attr_id > AVRCP_MEDIA_ATTR_ALL); 123 btstack_assert(attr_id < AVRCP_MEDIA_ATTR_RESERVED); 124 uint16_t pos = 0; 125 big_endian_store_32(buffer, pos, attr_id); 126 big_endian_store_16(buffer, pos + 4, RFC2978_CHARSET_MIB_UTF8); 127 big_endian_store_16(buffer, pos + 6, attr_value_size); 128 return 8; 129 } 130 131 static uint16_t avrcp_now_playing_info_attr_id_value_len(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id){ 132 char buffer[AVRCP_MAX_ATTRIBUTE_SIZE]; 133 uint16_t str_len; 134 switch (attr_id) { 135 case AVRCP_MEDIA_ATTR_ALL: 136 case AVRCP_MEDIA_ATTR_NONE: 137 return 0; 138 case AVRCP_MEDIA_ATTR_TRACK: 139 str_len = sprintf(buffer, "%0" PRIu32, connection->track_nr); 140 break; 141 case AVRCP_MEDIA_ATTR_TOTAL_NUM_ITEMS: 142 str_len = sprintf(buffer, "%0" PRIu32, connection->total_tracks); 143 break; 144 case AVRCP_MEDIA_ATTR_SONG_LENGTH_MS: 145 str_len = sprintf(buffer, "%0" PRIu32, connection->song_length_ms); 146 break; 147 default: 148 str_len = connection->now_playing_info[(uint16_t)attr_id - 1].len; 149 break; 150 } 151 return str_len; 152 } 153 154 static uint16_t avrcp_now_playing_info_value_len_with_headers(avrcp_connection_t * connection){ 155 uint16_t playing_info_len = 0; 156 157 uint8_t i; 158 for ( i = (uint8_t)AVRCP_MEDIA_ATTR_ALL + 1; i < (uint8_t) AVRCP_MEDIA_ATTR_RESERVED; i++){ 159 avrcp_media_attribute_id_t attr_id = (avrcp_media_attribute_id_t) i; 160 161 if ((connection->now_playing_info_attr_bitmap & (1 << attr_id)) == 0) { 162 continue; 163 } 164 165 switch (attr_id) { 166 case AVRCP_MEDIA_ATTR_ALL: 167 case AVRCP_MEDIA_ATTR_NONE: 168 case AVRCP_MEDIA_ATTR_DEFAULT_COVER_ART: 169 break; 170 default: 171 playing_info_len += AVRCP_ATTR_HEADER_LEN + avrcp_now_playing_info_attr_id_value_len(connection, attr_id); 172 break; 173 } 174 } 175 // for total num bytes that of the attributes + headers 176 playing_info_len += 1; 177 return playing_info_len; 178 } 179 180 static uint8_t * avrcp_get_attribute_value_from_u32(avrcp_connection_t * connection, uint32_t value, uint16_t * num_bytes_to_copy){ 181 *num_bytes_to_copy = 0; 182 183 if (connection->attribute_value_len == 0){ 184 connection->attribute_value_len = sprintf((char *)connection->attribute_value, "%0" PRIu32, value); 185 connection->attribute_value_offset = 0; 186 } 187 *num_bytes_to_copy = connection->attribute_value_len - connection->attribute_value_offset; 188 return connection->attribute_value + connection->attribute_value_offset; 189 } 190 191 static uint8_t * avrcp_get_next_value_fragment_for_attribute_id(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id, uint16_t * num_bytes_to_copy){ 192 switch (attr_id){ 193 case AVRCP_MEDIA_ATTR_TRACK: 194 return avrcp_get_attribute_value_from_u32(connection, connection->track_nr, num_bytes_to_copy); 195 case AVRCP_MEDIA_ATTR_TOTAL_NUM_ITEMS: 196 return avrcp_get_attribute_value_from_u32(connection, connection->total_tracks, num_bytes_to_copy); 197 case AVRCP_MEDIA_ATTR_SONG_LENGTH_MS: 198 return avrcp_get_attribute_value_from_u32(connection, connection->song_length_ms, num_bytes_to_copy); 199 default: 200 break; 201 } 202 int attr_index = attr_id - 1; 203 if (connection->attribute_value_len == 0){ 204 connection->attribute_value_len = avrcp_now_playing_info_attr_id_value_len(connection, attr_id); 205 connection->attribute_value_offset = 0; 206 } 207 *num_bytes_to_copy = connection->now_playing_info[attr_index].len - connection->attribute_value_offset; 208 return (uint8_t *) (connection->now_playing_info[attr_index].value + connection->attribute_value_offset); 209 } 210 211 // TODO Review 212 static uint16_t avrcp_store_avctp_now_playing_info_fragment(avrcp_connection_t * connection, uint16_t packet_size, uint8_t * packet){ 213 uint16_t num_free_bytes = packet_size; 214 215 uint16_t bytes_stored = 0; 216 217 while ((num_free_bytes > 0) && (connection->next_attr_id <= AVRCP_MEDIA_ATTR_SONG_LENGTH_MS)){ 218 if ((connection->now_playing_info_attr_bitmap & (1 << (uint8_t)connection->next_attr_id)) == 0) { 219 connection->next_attr_id = (avrcp_media_attribute_id_t) (((int) connection->next_attr_id) + 1); 220 continue; 221 } 222 223 // prepare attribute value 224 uint16_t num_bytes_to_copy; 225 uint8_t * attr_value_with_offset = avrcp_get_next_value_fragment_for_attribute_id(connection, 226 connection->next_attr_id, 227 &num_bytes_to_copy); 228 229 // store header 230 if (connection->attribute_value_offset == 0){ 231 // pack the whole attribute value header 232 if (connection->parser_attribute_header_pos == 0) { 233 avrcp_target_pack_single_element_header(connection->parser_attribute_header, connection->next_attr_id, 234 connection->attribute_value_len); 235 } 236 } 237 238 if (connection->parser_attribute_header_pos < AVRCP_ATTRIBUTE_HEADER_LEN){ 239 uint16_t num_header_bytes_to_store = btstack_min(num_free_bytes, AVRCP_ATTRIBUTE_HEADER_LEN - connection->parser_attribute_header_pos); 240 memcpy(packet + bytes_stored, connection->parser_attribute_header + connection->parser_attribute_header_pos, num_header_bytes_to_store); 241 connection->parser_attribute_header_pos += num_header_bytes_to_store; 242 bytes_stored += num_header_bytes_to_store; 243 num_free_bytes -= num_header_bytes_to_store; 244 connection->data_offset += num_header_bytes_to_store; 245 246 if (num_free_bytes == 0){ 247 continue; 248 } 249 } 250 251 // store value 252 uint16_t num_attr_value_bytes_to_store = btstack_min(num_free_bytes, connection->attribute_value_len - connection->attribute_value_offset); 253 memcpy(packet + bytes_stored, attr_value_with_offset, num_attr_value_bytes_to_store); 254 bytes_stored += num_attr_value_bytes_to_store; 255 num_free_bytes -= num_attr_value_bytes_to_store; 256 connection->attribute_value_offset += num_attr_value_bytes_to_store; 257 connection->data_offset += num_attr_value_bytes_to_store; 258 259 if (connection->attribute_value_offset == connection->attribute_value_len){ 260 // C++ compatible version of connection->next_attr_id++ 261 connection->next_attr_id = (avrcp_media_attribute_id_t) (((int) connection->next_attr_id) + 1); 262 connection->attribute_value_offset = 0; 263 connection->attribute_value_len = 0; 264 connection->parser_attribute_header_pos = 0; 265 } 266 } 267 return bytes_stored; 268 } 269 270 static void avrcp_send_response_with_avctp_fragmentation(avrcp_connection_t * connection){ 271 l2cap_reserve_packet_buffer(); 272 uint8_t * packet = l2cap_get_outgoing_buffer(); 273 274 // transport header 275 // Transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 276 277 uint16_t max_payload_size; 278 connection->avctp_packet_type = avctp_get_packet_type(connection, &max_payload_size); 279 connection->packet_type = avrcp_get_packet_type(connection); 280 281 // AVCTP header 282 // transport header : transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 283 uint16_t pos = 0; 284 packet[pos++] = (connection->transaction_id << 4) | (connection->avctp_packet_type << 2) | (AVRCP_RESPONSE_FRAME << 1) | 0; 285 286 uint8_t param_len = connection->data_len; 287 288 if (connection->avctp_packet_type == AVCTP_START_PACKET){ 289 uint8_t max_frame_size = btstack_min(l2cap_get_remote_mtu_for_local_cid(connection->l2cap_signaling_cid), AVRCP_MAX_AV_C_MESSAGE_FRAME_SIZE); 290 // first packet: max_payload_size 291 // rest packets 292 uint16_t num_payload_bytes = param_len - max_payload_size; 293 uint16_t frame_size_for_continue_packet = max_frame_size - avctp_get_num_bytes_for_header(AVCTP_CONTINUE_PACKET); 294 uint16_t num_avctp_packets = (num_payload_bytes + frame_size_for_continue_packet - 1)/frame_size_for_continue_packet + 1; 295 packet[pos++] = num_avctp_packets; 296 } 297 298 uint16_t bytes_stored = 0; 299 uint8_t i; 300 301 switch (connection->avctp_packet_type) { 302 case AVCTP_SINGLE_PACKET: 303 case AVCTP_START_PACKET: 304 // Profile IDentifier (PID) 305 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL >> 8; 306 packet[pos++] = BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL & 0x00FF; 307 308 // AVRCP message 309 // command_type 310 packet[pos++] = connection->command_type; 311 // subunit_type | subunit ID 312 packet[pos++] = (connection->subunit_type << 3) | connection->subunit_id; 313 // opcode 314 packet[pos++] = (uint8_t) connection->command_opcode; 315 316 switch (connection->command_opcode) { 317 case AVRCP_CMD_OPCODE_VENDOR_DEPENDENT: 318 big_endian_store_24(packet, pos, connection->company_id); 319 pos += 3; 320 packet[pos++] = connection->pdu_id; 321 // AVRCP packet type 322 323 packet[pos++] = (uint8_t)connection->packet_type; 324 // parameter length 325 big_endian_store_16(packet, pos, param_len); 326 pos += 2; 327 328 switch (connection->pdu_id) { 329 // message is small enough to fit the single packet, no need for extra check 330 case AVRCP_PDU_ID_GET_CAPABILITIES: 331 // capability ID 332 packet[pos++] = connection->data[0]; 333 // num_capabilities 334 packet[pos++] = connection->data[1]; 335 336 switch ((avrcp_capability_id_t) connection->data[0]) { 337 case AVRCP_CAPABILITY_ID_EVENT: 338 for (i = (uint8_t) AVRCP_NOTIFICATION_EVENT_FIRST_INDEX; 339 i < (uint8_t) AVRCP_NOTIFICATION_EVENT_LAST_INDEX; i++) { 340 if ((connection->target_supported_notifications & (1 << i)) == 0) { 341 continue; 342 } 343 packet[pos++] = i; 344 } 345 break; 346 case AVRCP_CAPABILITY_ID_COMPANY: 347 // use Bluetooth SIG as default company 348 for (i = 0; i < connection->data[1]; i++) { 349 little_endian_store_24(packet, pos, 350 connection->target_supported_companies[i]); 351 pos += 3; 352 } 353 break; 354 default: 355 // error response 356 break; 357 } 358 l2cap_send_prepared(connection->l2cap_signaling_cid, pos); 359 return; 360 361 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES: 362 363 packet[pos++] = connection->num_attributes; 364 max_payload_size--; 365 366 bytes_stored = avrcp_store_avctp_now_playing_info_fragment(connection, max_payload_size, packet + pos); 367 368 connection->avrcp_frame_bytes_sent += bytes_stored + pos; 369 l2cap_send_prepared(connection->l2cap_signaling_cid, pos + bytes_stored); 370 return; 371 372 default: 373 break; 374 } 375 break; 376 377 case AVRCP_CMD_OPCODE_PASS_THROUGH: 378 packet[pos++] = connection->operation_id; 379 // parameter length 380 packet[pos++] = (uint8_t) connection->data_len; 381 pos += 2; 382 break; 383 case AVRCP_CMD_OPCODE_UNIT_INFO: 384 break; 385 case AVRCP_CMD_OPCODE_SUBUNIT_INFO: 386 break; 387 default: 388 btstack_assert(false); 389 return; 390 } 391 break; 392 case AVCTP_CONTINUE_PACKET: 393 case AVCTP_END_PACKET: 394 switch (connection->pdu_id) { 395 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES: 396 bytes_stored = avrcp_store_avctp_now_playing_info_fragment(connection, max_payload_size, packet + pos); 397 398 connection->avrcp_frame_bytes_sent += bytes_stored + pos; 399 l2cap_send_prepared(connection->l2cap_signaling_cid, pos + bytes_stored); 400 return; 401 402 default: 403 break; 404 } 405 break; 406 default: 407 btstack_assert(false); 408 return; 409 } 410 411 // compare number of bytes to store with the remaining buffer size 412 uint16_t bytes_to_copy = btstack_min(connection->data_len - connection->data_offset, max_payload_size - pos); 413 414 (void)memcpy(packet + pos, &connection->data[connection->data_offset], bytes_to_copy); 415 pos += bytes_to_copy; 416 connection->data_offset += bytes_to_copy; 417 connection->avrcp_frame_bytes_sent += pos; 418 419 l2cap_send_prepared(connection->l2cap_signaling_cid, pos); 420 } 421 422 static void avctp_send_reject_cmd_wrong_pid(avrcp_connection_t * connection){ 423 l2cap_reserve_packet_buffer(); 424 uint8_t * packet = l2cap_get_outgoing_buffer(); 425 426 // AVCTP header 427 // transport header : transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 428 packet[0] = (connection->transaction_id << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 1; 429 big_endian_store_16(packet, 1, connection->cmd_operands[0]); 430 l2cap_send_prepared(connection->l2cap_signaling_cid, 3); 431 } 432 433 static void avrcp_target_custome_command_data_init(avrcp_connection_t * connection, 434 avrcp_command_opcode_t opcode, avrcp_command_type_t command_type, 435 avrcp_subunit_type_t subunit_type, avrcp_subunit_id_t subunit_id, 436 avrcp_pdu_id_t pdu_id, uint32_t company_id){ 437 438 connection->command_opcode = opcode; 439 connection->command_type = command_type; 440 connection->subunit_type = subunit_type; 441 connection->subunit_id = subunit_id; 442 connection->company_id = company_id << 16; 443 connection->pdu_id = pdu_id; 444 connection->data = NULL; 445 connection->data_offset = 0; 446 connection->data_len = 0; 447 } 448 449 static void avrcp_target_vendor_dependent_response_data_init(avrcp_connection_t * connection, avrcp_command_type_t command_type, avrcp_pdu_id_t pdu_id){ 450 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 451 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 452 connection->subunit_id = AVRCP_SUBUNIT_ID; 453 connection->company_id = BT_SIG_COMPANY_ID; 454 455 connection->command_type = command_type; 456 connection->pdu_id = pdu_id; 457 connection->data = connection->cmd_operands; 458 connection->data_offset = 0; 459 connection->avrcp_frame_bytes_sent = 0; 460 connection->state = AVCTP_W2_SEND_RESPONSE; 461 } 462 463 static void avrcp_target_pass_through_command_data_init(avrcp_connection_t * connection, avrcp_command_type_t command_type, avrcp_operation_id_t opid){ 464 connection->command_opcode = AVRCP_CMD_OPCODE_PASS_THROUGH; 465 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 466 connection->subunit_id = AVRCP_SUBUNIT_ID; 467 468 connection->command_type = command_type; 469 connection->company_id = 0; 470 connection->pdu_id = AVRCP_PDU_ID_UNDEFINED; 471 connection->operation_id = opid; 472 473 connection->data = connection->cmd_operands; 474 connection->data_offset = 0; 475 connection->data_len = 0; 476 } 477 478 479 static uint8_t avrcp_target_vendor_dependent_response_accept(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t status){ 480 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, pdu_id); 481 connection->data_len = 1; 482 connection->data[0] = status; 483 484 connection->accept_response = 1; 485 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 486 return ERROR_CODE_SUCCESS; 487 } 488 489 static uint8_t avrcp_target_response_vendor_dependent_reject(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, avrcp_status_code_t status){ 490 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_REJECTED, pdu_id); 491 connection->data_len = 1; 492 connection->data[0] = status; 493 494 connection->state = AVCTP_W2_SEND_RESPONSE; 495 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 496 return ERROR_CODE_SUCCESS; 497 } 498 499 static uint8_t avrcp_target_response_vendor_dependent_not_implemented(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t event_id){ 500 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_NOT_IMPLEMENTED, pdu_id); 501 connection->data_len = 1; 502 connection->data[0] = event_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 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){ 510 btstack_assert(value_len + 1 < AVRCP_MAX_COMMAND_PARAMETER_LENGTH); 511 512 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_INTERIM, pdu_id); 513 connection->data_len = 1 + value_len; 514 connection->data[0] = event_id; 515 516 if (value && (value_len > 0)){ 517 (void)memcpy(connection->data + 1, value, value_len); 518 } 519 520 connection->state = AVCTP_W2_SEND_RESPONSE; 521 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 522 return ERROR_CODE_SUCCESS; 523 } 524 525 static uint8_t avrcp_target_response_addressed_player_changed_interim(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t event_id){ 526 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_INTERIM, pdu_id); 527 528 connection->data_len = 5; 529 connection->data[0] = event_id; 530 big_endian_store_16(connection->data, 1, connection->addressed_player_id); 531 big_endian_store_16(connection->data, 3, connection->uid_counter); 532 533 connection->state = AVCTP_W2_SEND_RESPONSE; 534 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 535 return ERROR_CODE_SUCCESS; 536 } 537 538 static uint8_t avrcp_target_pass_through_response(uint16_t avrcp_cid, avrcp_command_type_t ctype, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 539 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 540 if (!connection){ 541 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 542 } 543 avrcp_target_pass_through_command_data_init(connection, ctype, opid); 544 545 if (operands_length == 1){ 546 connection->data_len = 1; 547 connection->cmd_operands[0] = operand; 548 } 549 550 connection->state = AVCTP_W2_SEND_RESPONSE; 551 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 552 return ERROR_CODE_SUCCESS; 553 } 554 555 uint8_t avrcp_target_operation_rejected(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 556 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_REJECTED, opid, operands_length, operand); 557 } 558 559 uint8_t avrcp_target_operation_accepted(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 560 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 561 } 562 563 uint8_t avrcp_target_operation_not_implemented(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 564 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 565 } 566 567 uint8_t avrcp_target_set_unit_info(uint16_t avrcp_cid, avrcp_subunit_type_t unit_type, uint32_t company_id){ 568 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 569 if (!connection){ 570 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 571 } 572 connection->unit_type = unit_type; 573 connection->company_id = company_id; 574 return ERROR_CODE_SUCCESS; 575 } 576 577 uint8_t 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){ 578 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 579 if (!connection){ 580 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 581 } 582 connection->subunit_info_type = subunit_type; 583 connection->subunit_info_data = subunit_info_data; 584 connection->subunit_info_data_size = subunit_info_data_size; 585 return ERROR_CODE_SUCCESS; 586 } 587 588 // TODO Review 589 static uint8_t avrcp_target_unit_info(avrcp_connection_t * connection){ 590 if (connection->state != AVCTP_CONNECTION_OPENED){ 591 return ERROR_CODE_COMMAND_DISALLOWED; 592 } 593 connection->state = AVCTP_W2_SEND_RESPONSE; 594 595 avrcp_target_custom_command_data_init(connection, 596 AVRCP_CMD_OPCODE_UNIT_INFO, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, 597 AVRCP_SUBUNIT_TYPE_UNIT, AVRCP_SUBUNIT_ID_IGNORE, AVRCP_PDU_ID_UNDEFINED, 598 connection->company_id); 599 600 uint8_t unit = 0; 601 connection->data = connection->cmd_operands; 602 connection->data_len = 5; 603 connection->data[0] = 0x07; 604 connection->data[1] = (connection->unit_type << 4) | unit; 605 // company id is 3 bytes long 606 big_endian_store_24(connection->data, 2, connection->company_id); 607 608 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 609 return ERROR_CODE_SUCCESS; 610 } 611 612 // TODO Review 613 static uint8_t avrcp_target_subunit_info(avrcp_connection_t * connection, uint8_t offset){ 614 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 615 if (offset >= 32) return AVRCP_STATUS_INVALID_PARAMETER; 616 617 connection->state = AVCTP_W2_SEND_RESPONSE; 618 619 avrcp_target_custom_command_data_init(connection, AVRCP_CMD_OPCODE_SUBUNIT_INFO, 620 AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, 621 AVRCP_SUBUNIT_TYPE_UNIT, AVRCP_SUBUNIT_ID_IGNORE, AVRCP_PDU_ID_UNDEFINED, 622 connection->company_id); 623 624 uint8_t page = offset / 4; 625 uint8_t extension_code = 7; 626 connection->data = connection->cmd_operands; 627 connection->data_len = 5; 628 connection->data[0] = (page << 4) | extension_code; 629 630 // mark non-existent entries with 0xff 631 memset(&connection->cmd_operands[1], 0xFF, 4); 632 if ((connection->data != NULL) && (offset < connection->subunit_info_data_size)){ 633 uint8_t bytes_to_copy = btstack_min(connection->subunit_info_data_size - offset, 4); 634 memcpy(&connection->data[1], &connection->subunit_info_data[offset], bytes_to_copy); 635 } 636 637 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 638 return ERROR_CODE_SUCCESS; 639 } 640 641 static uint8_t avrcp_target_response_vendor_dependent_supported_events(avrcp_connection_t * connection){ 642 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, AVRCP_PDU_ID_GET_CAPABILITIES); 643 connection->state = AVCTP_W2_SEND_RESPONSE; 644 645 uint8_t event_id; 646 uint8_t num_events = 0; 647 for (event_id = (uint8_t) AVRCP_NOTIFICATION_EVENT_FIRST_INDEX; event_id < (uint8_t) AVRCP_NOTIFICATION_EVENT_LAST_INDEX; event_id++){ 648 if ((connection->target_supported_notifications & (1<<event_id)) == 0){ 649 continue; 650 } 651 num_events++; 652 } 653 654 connection->data[0] = AVRCP_CAPABILITY_ID_EVENT; 655 connection->data[1] = num_events; 656 connection->data_len = 2 + num_events; 657 658 // fill the data later directly to the L2CAP outgoing buffer 659 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 660 return ERROR_CODE_SUCCESS; 661 } 662 663 static uint8_t avrcp_target_response_vendor_dependent_supported_companies(avrcp_connection_t * connection){ 664 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, AVRCP_PDU_ID_GET_CAPABILITIES); 665 connection->state = AVCTP_W2_SEND_RESPONSE; 666 667 connection->data[0] = AVRCP_CAPABILITY_ID_COMPANY; 668 if (connection->target_supported_companies_num == 0){ 669 connection->target_supported_companies_num = 1; 670 connection->target_supported_companies = default_companies; 671 } 672 673 connection->data[1] = connection->target_supported_companies_num; 674 connection->data_len = 2 + connection->data[1] * 3; 675 676 // fill the data later directly to the L2CAP outgoing buffer and 677 // use Bluetooth SIG as default company 678 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 679 return ERROR_CODE_SUCCESS; 680 } 681 682 uint8_t avrcp_target_support_event(uint16_t avrcp_cid, avrcp_notification_event_id_t event_id){ 683 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 684 if (!connection){ 685 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 686 } 687 688 if ((event_id < (uint8_t)AVRCP_NOTIFICATION_EVENT_FIRST_INDEX) || (event_id > (uint8_t)AVRCP_NOTIFICATION_EVENT_LAST_INDEX)){ 689 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 690 } 691 692 connection->target_supported_notifications |= (1 << (uint8_t)event_id); 693 return ERROR_CODE_SUCCESS; 694 } 695 696 uint8_t avrcp_target_support_companies(uint16_t avrcp_cid, uint8_t num_companies, const uint32_t *companies){ 697 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 698 if (!connection){ 699 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 700 } 701 702 connection->target_supported_companies_num = num_companies; 703 connection->target_supported_companies = companies; 704 return ERROR_CODE_SUCCESS; 705 } 706 707 // TODO Review (use flags) 708 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){ 709 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 710 if (!connection){ 711 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 712 } 713 if (connection->state != AVCTP_CONNECTION_OPENED){ 714 return ERROR_CODE_COMMAND_DISALLOWED; 715 } 716 717 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, AVRCP_PDU_ID_GET_PLAY_STATUS); 718 connection->data_len = 9; 719 big_endian_store_32(connection->data, 0, song_length_ms); 720 big_endian_store_32(connection->data, 4, song_position_ms); 721 connection->data[8] = play_status; 722 723 connection->state = AVCTP_W2_SEND_RESPONSE; 724 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 725 return ERROR_CODE_SUCCESS; 726 } 727 728 static uint8_t avrcp_target_store_media_attr(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id, const char * value){ 729 int index = attr_id - 1; 730 if (!value) return AVRCP_STATUS_INVALID_PARAMETER; 731 connection->now_playing_info[index].value = (uint8_t*)value; 732 connection->now_playing_info[index].len = strlen(value); 733 return ERROR_CODE_SUCCESS; 734 } 735 736 uint8_t avrcp_target_set_playback_status(uint16_t avrcp_cid, avrcp_playback_status_t playback_status){ 737 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 738 if (!connection){ 739 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 740 } 741 if (connection->playback_status == playback_status){ 742 return ERROR_CODE_SUCCESS; 743 } 744 745 connection->playback_status = playback_status; 746 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED)) { 747 connection->playback_status_changed = 1; 748 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 749 } 750 return ERROR_CODE_SUCCESS; 751 } 752 753 uint8_t avrcp_target_set_now_playing_info(uint16_t avrcp_cid, const avrcp_track_t * current_track, uint16_t total_tracks){ 754 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 755 if (!connection){ 756 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 757 } 758 if (!current_track){ 759 connection->track_selected = 0; 760 connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR; 761 return ERROR_CODE_COMMAND_DISALLOWED; 762 } 763 764 (void)memcpy(connection->track_id, current_track->track_id, 8); 765 connection->song_length_ms = current_track->song_length_ms; 766 connection->track_nr = current_track->track_nr; 767 connection->total_tracks = total_tracks; 768 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_TITLE, current_track->title); 769 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ARTIST, current_track->artist); 770 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ALBUM, current_track->album); 771 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_GENRE, current_track->genre); 772 773 connection->track_selected = 1; 774 775 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 776 connection->track_changed = 1; 777 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 778 } 779 return ERROR_CODE_SUCCESS; 780 } 781 782 uint8_t avrcp_target_track_changed(uint16_t avrcp_cid, uint8_t * track_id){ 783 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 784 if (!connection){ 785 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 786 } 787 if (!track_id){ 788 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 789 } 790 791 (void)memcpy(connection->track_id, track_id, 8); 792 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 793 connection->track_changed = 1; 794 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 795 } 796 return ERROR_CODE_SUCCESS; 797 } 798 799 uint8_t avrcp_target_playing_content_changed(uint16_t avrcp_cid){ 800 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 801 if (!connection){ 802 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 803 } 804 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED)) { 805 connection->playing_content_changed = 1; 806 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 807 } 808 return ERROR_CODE_SUCCESS; 809 } 810 811 uint8_t avrcp_target_addressed_player_changed(uint16_t avrcp_cid, uint16_t player_id, uint16_t uid_counter){ 812 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 813 if (!connection){ 814 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 815 } 816 817 if (connection->addressed_player_id == player_id){ 818 return ERROR_CODE_SUCCESS; 819 } 820 821 connection->uid_counter = uid_counter; 822 connection->addressed_player_id = player_id; 823 824 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED)) { 825 connection->addressed_player_changed = 1; 826 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 827 } 828 return ERROR_CODE_SUCCESS; 829 } 830 831 uint8_t avrcp_target_battery_status_changed(uint16_t avrcp_cid, avrcp_battery_status_t battery_status){ 832 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 833 if (!connection){ 834 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 835 } 836 if (connection->battery_status == battery_status){ 837 return ERROR_CODE_SUCCESS; 838 } 839 840 connection->battery_status = battery_status; 841 842 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED)) { 843 connection->battery_status_changed = 1; 844 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 845 } 846 return ERROR_CODE_SUCCESS; 847 } 848 849 uint8_t avrcp_target_adjust_absolute_volume(uint16_t avrcp_cid, uint8_t absolute_volume){ 850 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 851 if (!connection){ 852 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 853 } 854 855 connection->absolute_volume = absolute_volume; 856 return ERROR_CODE_SUCCESS; 857 } 858 859 uint8_t avrcp_target_volume_changed(uint16_t avrcp_cid, uint8_t absolute_volume){ 860 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 861 if (!connection){ 862 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 863 } 864 if (connection->absolute_volume == absolute_volume){ 865 return ERROR_CODE_SUCCESS; 866 } 867 868 connection->absolute_volume = absolute_volume; 869 870 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED )) { 871 connection->notify_absolute_volume_changed = 1; 872 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 873 } 874 return ERROR_CODE_SUCCESS; 875 } 876 877 static void avrcp_target_set_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification, uint8_t transaction_label){ 878 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return; 879 connection->notifications_transaction_label[notification] = transaction_label; 880 } 881 882 static uint8_t avrcp_target_get_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification){ 883 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return 0; 884 return connection->notifications_transaction_label[notification]; 885 } 886 887 static bool avcrp_operation_id_is_valid(avrcp_operation_id_t operation_id){ 888 if (operation_id < AVRCP_OPERATION_ID_RESERVED_1) return true; 889 890 if (operation_id < AVRCP_OPERATION_ID_0) return false; 891 if (operation_id < AVRCP_OPERATION_ID_RESERVED_2) return true; 892 893 if (operation_id < AVRCP_OPERATION_ID_CHANNEL_UP) return false; 894 if (operation_id < AVRCP_OPERATION_ID_RESERVED_3) return true; 895 896 if (operation_id < AVRCP_OPERATION_ID_CHANNEL_UP) return false; 897 if (operation_id < AVRCP_OPERATION_ID_RESERVED_3) return true; 898 899 if (operation_id < AVRCP_OPERATION_ID_SKIP) return false; 900 if (operation_id == AVRCP_OPERATION_ID_SKIP) return true; 901 902 if (operation_id < AVRCP_OPERATION_ID_POWER) return false; 903 if (operation_id < AVRCP_OPERATION_ID_RESERVED_4) return true; 904 905 if (operation_id < AVRCP_OPERATION_ID_ANGLE) return false; 906 if (operation_id < AVRCP_OPERATION_ID_RESERVED_5) return true; 907 908 if (operation_id < AVRCP_OPERATION_ID_F1) return false; 909 if (operation_id < AVRCP_OPERATION_ID_RESERVED_6) return true; 910 911 return false; 912 } 913 914 915 #ifdef ENABLE_AVCTP_FRAGMENTATION 916 static void avctp_reassemble_message(avrcp_connection_t * connection, avctp_packet_type_t packet_type, uint8_t *packet, uint16_t size){ 917 // after header (transaction label and packet type) 918 uint16_t pos; 919 uint16_t bytes_to_store; 920 921 switch (packet_type){ 922 case AVCTP_START_PACKET: 923 if (size < 2) return; 924 925 // store header 926 pos = 0; 927 connection->avctp_reassembly_buffer[pos] = packet[pos]; 928 pos++; 929 connection->avctp_reassembly_size = pos; 930 931 // NOTE: num packets not needed for reassembly, ignoring it does not pose security risk -> no need to store it 932 pos++; 933 934 // PID in reassembled packet is at offset 1, it will be read later after the avctp_reassemble_message with AVCTP_END_PACKET is called 935 936 bytes_to_store = btstack_min(size - pos, sizeof(connection->avctp_reassembly_buffer) - connection->avctp_reassembly_size); 937 memcpy(&connection->avctp_reassembly_buffer[connection->avctp_reassembly_size], &packet[pos], bytes_to_store); 938 connection->avctp_reassembly_size += bytes_to_store; 939 break; 940 941 case AVCTP_CONTINUE_PACKET: 942 case AVCTP_END_PACKET: 943 if (size < 1) return; 944 945 // store remaining data, ignore header 946 pos = 1; 947 bytes_to_store = btstack_min(size - pos, sizeof(connection->avctp_reassembly_buffer) - connection->avctp_reassembly_size); 948 memcpy(&connection->avctp_reassembly_buffer[connection->avctp_reassembly_size], &packet[pos], bytes_to_store); 949 connection->avctp_reassembly_size += bytes_to_store; 950 break; 951 952 default: 953 return; 954 } 955 } 956 #endif 957 958 static void avrcp_handle_l2cap_data_packet_for_signaling_connection(avrcp_connection_t * connection, uint8_t * packet, uint16_t size){ 959 uint8_t avctp_header = packet[0]; 960 connection->transaction_id = avctp_header >> 4; 961 962 avctp_packet_type_t avctp_packet_type = (avctp_packet_type_t) ((avctp_header & 0x0F) >> 2); 963 switch (avctp_packet_type){ 964 case AVCTP_SINGLE_PACKET: 965 break; 966 967 #ifdef ENABLE_AVCTP_FRAGMENTATION 968 case AVCTP_START_PACKET: 969 case AVCTP_CONTINUE_PACKET: 970 avctp_reassemble_message(connection, avctp_packet_type, packet, size); 971 return; 972 973 case AVCTP_END_PACKET: 974 avctp_reassemble_message(connection, avctp_packet_type, packet, size); 975 976 packet = connection->avctp_reassembly_buffer; 977 size = connection->avctp_reassembly_size; 978 break; 979 #endif 980 default: 981 return; 982 } 983 984 if (size < 6u) return; 985 986 uint16_t pid = big_endian_read_16(packet, 1); 987 988 if (pid != BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL){ 989 log_info("Invalid pid 0x%02x, expected 0x%02x", pid, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL); 990 connection->reject_transport_header = true; 991 connection->invalid_pid = pid; 992 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 993 return; 994 } 995 996 // avrcp_subunit_type_t subunit_type = (avrcp_subunit_type_t) (packet[4] >> 3); 997 // avrcp_subunit_id_t subunit_id = (avrcp_subunit_id_t) (packet[4] & 0x07); 998 999 avrcp_command_opcode_t opcode = (avrcp_command_opcode_t) avrcp_cmd_opcode(packet,size); 1000 1001 int pos = 6; 1002 uint16_t length; 1003 avrcp_pdu_id_t pdu_id; 1004 // connection->data_len = 0; 1005 uint8_t offset; 1006 uint8_t operand; 1007 uint16_t event_mask; 1008 avrcp_operation_id_t operation_id; 1009 1010 switch (opcode){ 1011 case AVRCP_CMD_OPCODE_UNIT_INFO: 1012 avrcp_target_unit_info(connection); 1013 break; 1014 case AVRCP_CMD_OPCODE_SUBUNIT_INFO: 1015 if ((size - pos) < 3) return; 1016 // page: packet[pos] >> 4, 1017 offset = 4 * (packet[pos]>>4); 1018 // extension code (fixed 7) = packet[pos] & 0x0F 1019 // 4 bytes paga data, all 0xFF 1020 avrcp_target_subunit_info(connection, offset); 1021 break; 1022 1023 case AVRCP_CMD_OPCODE_PASS_THROUGH: 1024 if (size < 8) return; 1025 log_info("AVRCP_OPERATION_ID 0x%02x, operands length %d", packet[6], packet[7]); 1026 operation_id = (avrcp_operation_id_t) (packet[6] & 0x7f); 1027 operand = 0; 1028 if ((packet[7] >= 1) && (size >= 9)){ 1029 operand = packet[8]; 1030 } 1031 1032 if (avcrp_operation_id_is_valid(operation_id)){ 1033 bool button_pressed = (packet[6] & 0x80) == 0; 1034 1035 avrcp_target_operation_accepted(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], operand); 1036 avrcp_target_emit_operation(avrcp_target_context.avrcp_callback, connection->avrcp_cid, 1037 operation_id, button_pressed, packet[7], operand); 1038 } else { 1039 avrcp_target_operation_not_implemented(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], operand); 1040 } 1041 break; 1042 1043 1044 case AVRCP_CMD_OPCODE_VENDOR_DEPENDENT: 1045 1046 if (size < 13) return; 1047 1048 // pos = 6 - company id 1049 (void)memcpy(connection->cmd_operands, &packet[pos], 3); 1050 // connection->data_len = 3; 1051 pos += 3; 1052 // pos = 9 1053 pdu_id = (avrcp_pdu_id_t) packet[pos++]; 1054 // 1 - reserved 1055 pos++; 1056 // 2-3 param length, 1057 length = big_endian_read_16(packet, pos); 1058 pos += 2; 1059 // pos = 13 1060 switch (pdu_id){ 1061 case AVRCP_PDU_ID_SET_ADDRESSED_PLAYER:{ 1062 if ((pos + 2) > size) return; 1063 bool ok = length == 4; 1064 if (avrcp_target_context.set_addressed_player_callback != NULL){ 1065 uint16_t player_id = big_endian_read_16(packet, pos); 1066 ok = avrcp_target_context.set_addressed_player_callback(player_id); 1067 } 1068 if (ok){ 1069 avrcp_target_vendor_dependent_response_accept(connection, pdu_id, AVRCP_STATUS_SUCCESS); 1070 } else { 1071 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PLAYER_ID); 1072 } 1073 break; 1074 } 1075 case AVRCP_PDU_ID_GET_CAPABILITIES:{ 1076 avrcp_capability_id_t capability_id = (avrcp_capability_id_t) packet[pos]; 1077 switch (capability_id){ 1078 case AVRCP_CAPABILITY_ID_EVENT: 1079 avrcp_target_response_vendor_dependent_supported_events(connection); 1080 break; 1081 case AVRCP_CAPABILITY_ID_COMPANY: 1082 avrcp_target_response_vendor_dependent_supported_companies(connection); 1083 break; 1084 default: 1085 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 1086 break; 1087 } 1088 break; 1089 } 1090 case AVRCP_PDU_ID_GET_PLAY_STATUS: 1091 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_PLAY_STATUS_QUERY); 1092 break; 1093 case AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE: 1094 if ((pos + 1) > size) return; 1095 connection->cmd_operands[0] = packet[pos]; 1096 connection->abort_continue_response = 1; 1097 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1098 break; 1099 case AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE: 1100 if ((pos + 1) > size) return; 1101 if (packet[pos] != AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES){ 1102 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1103 return; 1104 } 1105 connection->now_playing_info_response = true; 1106 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1107 break; 1108 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES:{ 1109 if ((pos + 9) > size) return; 1110 uint8_t play_identifier[8]; 1111 memset(play_identifier, 0, 8); 1112 if (memcmp(&packet[pos], play_identifier, 8) != 0) { 1113 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 1114 return; 1115 } 1116 pos += 8; 1117 uint8_t attribute_count = packet[pos++]; 1118 connection->next_attr_id = AVRCP_MEDIA_ATTR_NONE; 1119 if (!attribute_count){ 1120 connection->next_attr_id = AVRCP_MEDIA_ATTR_TITLE; 1121 connection->now_playing_info_attr_bitmap = 0xFE; 1122 } else { 1123 int i; 1124 connection->next_attr_id = AVRCP_MEDIA_ATTR_TITLE; 1125 connection->now_playing_info_attr_bitmap = 0; 1126 connection->num_attributes = 0; 1127 if ((pos + attribute_count * 4) > size) return; 1128 for (i=0; i < attribute_count; i++){ 1129 uint32_t attr_id = big_endian_read_32(packet, pos); 1130 connection->now_playing_info_attr_bitmap |= (1 << attr_id); 1131 pos += 4; 1132 } 1133 } 1134 log_info("now_playing_info_attr_bitmap 0x%02x", connection->now_playing_info_attr_bitmap); 1135 connection->num_attributes = count_set_bits_uint32(connection->now_playing_info_attr_bitmap); 1136 connection->now_playing_info_response = true; 1137 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1138 break; 1139 } 1140 case AVRCP_PDU_ID_REGISTER_NOTIFICATION:{ 1141 if ((pos + 1) > size) return; 1142 avrcp_notification_event_id_t event_id = (avrcp_notification_event_id_t) packet[pos]; 1143 1144 avrcp_target_set_transaction_label_for_notification(connection, event_id, connection->transaction_id); 1145 1146 if (event_id < AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED || 1147 event_id > AVRCP_NOTIFICATION_EVENT_MAX_VALUE){ 1148 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 1149 return; 1150 } 1151 1152 switch (event_id){ 1153 case AVRCP_NOTIFICATION_EVENT_AVAILABLE_PLAYERS_CHANGED: 1154 case AVRCP_NOTIFICATION_EVENT_PLAYER_APPLICATION_SETTING_CHANGED: 1155 case AVRCP_NOTIFICATION_EVENT_UIDS_CHANGED: 1156 case AVRCP_NOTIFICATION_EVENT_TRACK_REACHED_END: 1157 case AVRCP_NOTIFICATION_EVENT_TRACK_REACHED_START: 1158 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_POS_CHANGED: 1159 case AVRCP_NOTIFICATION_EVENT_SYSTEM_STATUS_CHANGED: 1160 case AVRCP_NOTIFICATION_EVENT_MAX_VALUE: 1161 avrcp_target_response_vendor_dependent_not_implemented(connection, pdu_id, event_id); 1162 return; 1163 default: 1164 break; 1165 } 1166 1167 event_mask = (1 << event_id); 1168 connection->notifications_enabled |= event_mask; 1169 1170 switch (event_id){ 1171 case AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED: 1172 if (connection->track_selected){ 1173 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_SELECTED, 8); 1174 } else { 1175 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_NOT_SELECTED, 8); 1176 } 1177 break; 1178 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED: 1179 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->playback_status, 1); 1180 break; 1181 case AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED: 1182 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, NULL, 0); 1183 break; 1184 case AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED: 1185 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->absolute_volume, 1); 1186 break; 1187 case AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: 1188 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->battery_status, 1); 1189 break; 1190 case AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED: 1191 avrcp_target_response_addressed_player_changed_interim(connection, pdu_id, event_id); 1192 return; 1193 default: 1194 btstack_assert(false); 1195 return; 1196 } 1197 break; 1198 } 1199 case AVRCP_PDU_ID_SET_ABSOLUTE_VOLUME: { 1200 if ( (length != 1) || ((pos + 1) > size)){ 1201 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1202 break; 1203 } 1204 1205 uint8_t absolute_volume = packet[pos]; 1206 if (absolute_volume < 0x80){ 1207 connection->absolute_volume = absolute_volume; 1208 } 1209 avrcp_target_emit_volume_changed(avrcp_target_context.avrcp_callback, connection->avrcp_cid, connection->absolute_volume); 1210 avrcp_target_vendor_dependent_response_accept(connection, pdu_id, connection->absolute_volume); 1211 break; 1212 } 1213 default: 1214 log_info("AVRCP target: unhandled pdu id 0x%02x", pdu_id); 1215 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1216 break; 1217 } 1218 break; 1219 default: 1220 log_info("AVRCP target: opcode 0x%02x not implemented", avrcp_cmd_opcode(packet,size)); 1221 break; 1222 } 1223 } 1224 1225 static void avrcp_target_notification_init(avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id, uint8_t * value, uint16_t value_len){ 1226 btstack_assert((value_len == 0) || (value != NULL)); 1227 1228 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_CHANGED_STABLE, AVRCP_PDU_ID_REGISTER_NOTIFICATION); 1229 connection->transaction_id = avrcp_target_get_transaction_label_for_notification(connection, notification_id); 1230 1231 connection->data_len = 1 + value_len; 1232 connection->data[0] = notification_id; 1233 if (value_len > 0){ 1234 (void)memcpy(connection->data + 1, value, value_len); 1235 } 1236 } 1237 1238 static void avrcp_target_notification_addressed_player_changed_init(avrcp_connection_t * connection){ 1239 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_CHANGED_STABLE, AVRCP_PDU_ID_REGISTER_NOTIFICATION); 1240 connection->transaction_id = avrcp_target_get_transaction_label_for_notification(connection, AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED); 1241 1242 connection->data_len = 5; 1243 connection->data[0] = AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED; 1244 big_endian_store_16(connection->data, 1, connection->addressed_player_id); 1245 big_endian_store_16(connection->data, 3, connection->uid_counter); 1246 } 1247 1248 1249 static void avrcp_target_reset_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id){ 1250 if (notification_id < AVRCP_NOTIFICATION_EVENT_FIRST_INDEX || notification_id > AVRCP_NOTIFICATION_EVENT_LAST_INDEX){ 1251 return; 1252 } 1253 connection->notifications_enabled &= ~(1 << notification_id); 1254 connection->notifications_transaction_label[notification_id] = 0; 1255 } 1256 1257 static void avrcp_request_next_avctp_segment(avrcp_connection_t * connection){ 1258 // AVCTP 1259 switch (connection->avctp_packet_type){ 1260 case AVCTP_END_PACKET: 1261 case AVCTP_SINGLE_PACKET: 1262 connection->avrcp_frame_bytes_sent = 0; 1263 connection->data_offset = 0; 1264 connection->data_len = 0; 1265 connection->state = AVCTP_CONNECTION_OPENED; 1266 break; 1267 default: 1268 connection->state = AVCTP_W2_SEND_RESPONSE; 1269 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1270 break; 1271 } 1272 } 1273 1274 static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1275 avrcp_connection_t * connection; 1276 bool send_response = true; 1277 avrcp_notification_event_id_t notification_id = AVRCP_NOTIFICATION_EVENT_NONE; 1278 1279 switch (packet_type){ 1280 case L2CAP_DATA_PACKET: 1281 connection = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1282 avrcp_handle_l2cap_data_packet_for_signaling_connection(connection, packet, size); 1283 return; 1284 1285 case HCI_EVENT_PACKET: 1286 if (hci_event_packet_get_type(packet) != L2CAP_EVENT_CAN_SEND_NOW){ 1287 return; 1288 } 1289 1290 connection = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1291 if (connection == NULL){ 1292 return; 1293 } 1294 1295 // START AVCTP 1296 if (connection->reject_transport_header){ 1297 connection->reject_transport_header = false; 1298 avctp_send_reject_cmd_wrong_pid(connection); 1299 connection->state = AVCTP_CONNECTION_OPENED; 1300 return; 1301 } 1302 // END AVCTP 1303 1304 if (connection->accept_response){ 1305 connection->accept_response = 0; 1306 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE); 1307 break; 1308 } 1309 1310 if (connection->abort_continue_response){ 1311 connection->abort_continue_response = 0; 1312 connection->now_playing_info_response = false; 1313 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE); 1314 break; 1315 } 1316 1317 if (connection->now_playing_info_response){ 1318 connection->now_playing_info_response = false; 1319 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES); 1320 connection->data_len = avrcp_now_playing_info_value_len_with_headers(connection); 1321 break; 1322 } 1323 1324 if (connection->track_changed){ 1325 connection->track_changed = 0; 1326 notification_id = AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED; 1327 avrcp_target_notification_init(connection, notification_id, connection->track_id, 8); 1328 break; 1329 } 1330 1331 if (connection->playback_status_changed){ 1332 connection->playback_status_changed = 0; 1333 notification_id = AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED; 1334 uint8_t playback_status = (uint8_t) connection->playback_status; 1335 avrcp_target_notification_init(connection, notification_id, &playback_status, 1); 1336 break; 1337 } 1338 1339 if (connection->playing_content_changed){ 1340 connection->playing_content_changed = 0; 1341 notification_id = AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED; 1342 avrcp_target_notification_init(connection, notification_id, NULL, avrcp_now_playing_info_value_len_with_headers(connection)); 1343 break; 1344 } 1345 1346 if (connection->battery_status_changed){ 1347 connection->battery_status_changed = 0; 1348 notification_id = AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED; 1349 avrcp_target_notification_init(connection, notification_id, (uint8_t *)&connection->battery_status, 1); 1350 break; 1351 } 1352 1353 if (connection->notify_absolute_volume_changed){ 1354 connection->notify_absolute_volume_changed = 0; 1355 notification_id = AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED; 1356 avrcp_target_notification_init(connection, notification_id, &connection->absolute_volume, 1); 1357 break; 1358 } 1359 1360 if (connection->addressed_player_changed){ 1361 connection->addressed_player_changed = 0; 1362 notification_id = AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED; 1363 avrcp_target_notification_addressed_player_changed_init(connection); 1364 break; 1365 } 1366 1367 send_response = false; 1368 break; 1369 1370 default: 1371 return; 1372 } 1373 1374 if (connection != NULL && (send_response || connection->state == AVCTP_W2_SEND_RESPONSE)){ 1375 avrcp_send_response_with_avctp_fragmentation(connection); 1376 avrcp_target_reset_notification(connection, notification_id); 1377 avrcp_request_next_avctp_segment(connection); 1378 } 1379 } 1380 1381 void avrcp_target_init(void){ 1382 avrcp_target_context.role = AVRCP_TARGET; 1383 avrcp_target_context.packet_handler = avrcp_target_packet_handler; 1384 avrcp_register_target_packet_handler(&avrcp_target_packet_handler); 1385 } 1386 1387 void avrcp_target_deinit(void){ 1388 memset(&avrcp_target_context, 0, sizeof(avrcp_context_t)); 1389 } 1390 1391 void avrcp_target_register_packet_handler(btstack_packet_handler_t callback){ 1392 btstack_assert(callback != NULL); 1393 avrcp_target_context.avrcp_callback = callback; 1394 } 1395 1396 void avrcp_target_register_set_addressed_player_handler(bool (*callback)(uint16_t player_id)){ 1397 btstack_assert(callback != NULL); 1398 avrcp_target_context.set_addressed_player_callback = callback; 1399 } 1400 1401 1402