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 packet[pos++] = connection->data[0]; 332 connection->data_offset++; 333 334 packet[pos++] = connection->data[1]; 335 connection->data_offset++; 336 337 switch ((avrcp_capability_id_t) connection->data[0]) { 338 case AVRCP_CAPABILITY_ID_EVENT: 339 for (i = (uint8_t) AVRCP_NOTIFICATION_EVENT_FIRST_INDEX; 340 i < (uint8_t) AVRCP_NOTIFICATION_EVENT_LAST_INDEX; i++) { 341 if ((connection->target_supported_notifications & (1 << i)) == 0) { 342 continue; 343 } 344 packet[pos++] = i; 345 connection->data_offset++; 346 } 347 break; 348 case AVRCP_CAPABILITY_ID_COMPANY: 349 // use Bluetooth SIG as default company 350 if (connection->target_supported_companies_num == 0) { 351 little_endian_store_24(packet, pos, default_companies[0]); 352 pos += 3; 353 connection->data_offset += 3; 354 } else { 355 for (i = 0; i < connection->data[1]; i++) { 356 little_endian_store_24(packet, pos, 357 connection->target_supported_companies[i]); 358 pos += 3; 359 connection->data_offset += 3; 360 } 361 } 362 break; 363 default: 364 btstack_assert(false); 365 return; 366 } 367 l2cap_send_prepared(connection->l2cap_signaling_cid, pos); 368 return; 369 370 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES: 371 372 packet[pos++] = connection->num_attributes; 373 max_payload_size--; 374 375 bytes_stored = avrcp_store_avctp_now_playing_info_fragment(connection, max_payload_size, packet + pos); 376 377 connection->avrcp_frame_bytes_sent += bytes_stored + pos; 378 l2cap_send_prepared(connection->l2cap_signaling_cid, pos + bytes_stored); 379 return; 380 381 default: 382 break; 383 } 384 break; 385 386 case AVRCP_CMD_OPCODE_PASS_THROUGH: 387 packet[pos++] = connection->operation_id; 388 // parameter length 389 packet[pos++] = (uint8_t) connection->data_len; 390 pos += 2; 391 break; 392 case AVRCP_CMD_OPCODE_UNIT_INFO: 393 break; 394 case AVRCP_CMD_OPCODE_SUBUNIT_INFO: 395 break; 396 default: 397 btstack_assert(false); 398 return; 399 } 400 break; 401 case AVCTP_CONTINUE_PACKET: 402 case AVCTP_END_PACKET: 403 switch (connection->pdu_id) { 404 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES: 405 bytes_stored = avrcp_store_avctp_now_playing_info_fragment(connection, max_payload_size, packet + pos); 406 407 connection->avrcp_frame_bytes_sent += bytes_stored + pos; 408 l2cap_send_prepared(connection->l2cap_signaling_cid, pos + bytes_stored); 409 return; 410 411 default: 412 break; 413 } 414 break; 415 default: 416 btstack_assert(false); 417 return; 418 } 419 420 // compare number of bytes to store with the remaining buffer size 421 uint16_t bytes_to_copy = btstack_min(connection->data_len - connection->data_offset, max_payload_size - pos); 422 423 (void)memcpy(packet + pos, &connection->data[connection->data_offset], bytes_to_copy); 424 pos += bytes_to_copy; 425 connection->data_offset += bytes_to_copy; 426 connection->avrcp_frame_bytes_sent += pos; 427 428 l2cap_send_prepared(connection->l2cap_signaling_cid, pos); 429 } 430 431 static void avctp_send_reject_cmd_wrong_pid(avrcp_connection_t * connection){ 432 l2cap_reserve_packet_buffer(); 433 uint8_t * packet = l2cap_get_outgoing_buffer(); 434 435 // AVCTP header 436 // transport header : transaction label | Packet_type | C/R | IPID (1 == invalid profile identifier) 437 packet[0] = (connection->transaction_id << 4) | (AVRCP_SINGLE_PACKET << 2) | (AVRCP_RESPONSE_FRAME << 1) | 1; 438 big_endian_store_16(packet, 1, connection->cmd_operands[0]); 439 l2cap_send_prepared(connection->l2cap_signaling_cid, 3); 440 } 441 442 static void avrcp_target_custome_command_data_init(avrcp_connection_t * connection, 443 avrcp_command_opcode_t opcode, avrcp_command_type_t command_type, 444 avrcp_subunit_type_t subunit_type, avrcp_subunit_id_t subunit_id, 445 avrcp_pdu_id_t pdu_id, uint32_t company_id){ 446 447 connection->command_opcode = opcode; 448 connection->command_type = command_type; 449 connection->subunit_type = subunit_type; 450 connection->subunit_id = subunit_id; 451 connection->company_id = company_id << 16; 452 connection->pdu_id = pdu_id; 453 connection->data = NULL; 454 connection->data_offset = 0; 455 connection->data_len = 0; 456 } 457 458 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){ 459 connection->command_opcode = AVRCP_CMD_OPCODE_VENDOR_DEPENDENT; 460 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 461 connection->subunit_id = AVRCP_SUBUNIT_ID; 462 connection->company_id = BT_SIG_COMPANY_ID; 463 464 connection->command_type = command_type; 465 connection->pdu_id = pdu_id; 466 connection->data = connection->cmd_operands; 467 connection->data_offset = 0; 468 connection->avrcp_frame_bytes_sent = 0; 469 connection->state = AVCTP_W2_SEND_RESPONSE; 470 } 471 472 static void avrcp_target_pass_through_command_data_init(avrcp_connection_t * connection, avrcp_command_type_t command_type, avrcp_operation_id_t opid){ 473 connection->command_opcode = AVRCP_CMD_OPCODE_PASS_THROUGH; 474 connection->subunit_type = AVRCP_SUBUNIT_TYPE_PANEL; 475 connection->subunit_id = AVRCP_SUBUNIT_ID; 476 477 connection->command_type = command_type; 478 connection->company_id = 0; 479 connection->pdu_id = AVRCP_PDU_ID_UNDEFINED; 480 connection->operation_id = opid; 481 482 connection->data = connection->cmd_operands; 483 connection->data_offset = 0; 484 connection->data_len = 0; 485 } 486 487 488 static uint8_t avrcp_target_vendor_dependent_response_accept(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t status){ 489 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, pdu_id); 490 connection->data_len = 1; 491 connection->data[0] = status; 492 493 connection->accept_response = 1; 494 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 495 return ERROR_CODE_SUCCESS; 496 } 497 498 static uint8_t avrcp_target_response_vendor_dependent_reject(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, avrcp_status_code_t status){ 499 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_REJECTED, pdu_id); 500 connection->data_len = 1; 501 connection->data[0] = status; 502 503 connection->state = AVCTP_W2_SEND_RESPONSE; 504 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 505 return ERROR_CODE_SUCCESS; 506 } 507 508 static uint8_t avrcp_target_response_vendor_dependent_not_implemented(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t event_id){ 509 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_NOT_IMPLEMENTED, pdu_id); 510 connection->data_len = 1; 511 connection->data[0] = event_id; 512 513 connection->state = AVCTP_W2_SEND_RESPONSE; 514 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 515 return ERROR_CODE_SUCCESS; 516 } 517 518 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){ 519 btstack_assert(value_len + 1 < AVRCP_MAX_COMMAND_PARAMETER_LENGTH); 520 521 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_INTERIM, pdu_id); 522 connection->data_len = 1 + value_len; 523 connection->data[0] = event_id; 524 525 if (value && (value_len > 0)){ 526 (void)memcpy(connection->data + 1, value, value_len); 527 } 528 529 connection->state = AVCTP_W2_SEND_RESPONSE; 530 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 531 return ERROR_CODE_SUCCESS; 532 } 533 534 static uint8_t avrcp_target_response_addressed_player_changed_interim(avrcp_connection_t * connection, avrcp_pdu_id_t pdu_id, uint8_t event_id){ 535 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_INTERIM, pdu_id); 536 537 connection->data_len = 5; 538 connection->data[0] = event_id; 539 big_endian_store_16(connection->data, 1, connection->addressed_player_id); 540 big_endian_store_16(connection->data, 3, connection->uid_counter); 541 542 connection->state = AVCTP_W2_SEND_RESPONSE; 543 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 544 return ERROR_CODE_SUCCESS; 545 } 546 547 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){ 548 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 549 if (!connection){ 550 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 551 } 552 avrcp_target_pass_through_command_data_init(connection, ctype, opid); 553 554 if (operands_length == 1){ 555 connection->data_len = 1; 556 connection->cmd_operands[0] = operand; 557 } 558 559 connection->state = AVCTP_W2_SEND_RESPONSE; 560 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 561 return ERROR_CODE_SUCCESS; 562 } 563 564 uint8_t avrcp_target_operation_rejected(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 565 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_REJECTED, opid, operands_length, operand); 566 } 567 568 uint8_t avrcp_target_operation_accepted(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 569 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 570 } 571 572 uint8_t avrcp_target_operation_not_implemented(uint16_t avrcp_cid, avrcp_operation_id_t opid, uint8_t operands_length, uint8_t operand){ 573 return avrcp_target_pass_through_response(avrcp_cid, AVRCP_CTYPE_RESPONSE_ACCEPTED, opid, operands_length, operand); 574 } 575 576 uint8_t avrcp_target_set_unit_info(uint16_t avrcp_cid, avrcp_subunit_type_t unit_type, uint32_t company_id){ 577 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 578 if (!connection){ 579 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 580 } 581 connection->unit_type = unit_type; 582 connection->company_id = company_id; 583 return ERROR_CODE_SUCCESS; 584 } 585 586 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){ 587 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 588 if (!connection){ 589 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 590 } 591 connection->subunit_info_type = subunit_type; 592 connection->subunit_info_data = subunit_info_data; 593 connection->subunit_info_data_size = subunit_info_data_size; 594 return ERROR_CODE_SUCCESS; 595 } 596 597 // TODO Review 598 static uint8_t avrcp_target_unit_info(avrcp_connection_t * connection){ 599 if (connection->state != AVCTP_CONNECTION_OPENED){ 600 return ERROR_CODE_COMMAND_DISALLOWED; 601 } 602 connection->state = AVCTP_W2_SEND_RESPONSE; 603 604 avrcp_target_custome_command_data_init(connection, 605 AVRCP_CMD_OPCODE_UNIT_INFO, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, 606 AVRCP_SUBUNIT_TYPE_UNIT, AVRCP_SUBUNIT_ID_IGNORE, AVRCP_PDU_ID_UNDEFINED, connection->company_id); 607 608 uint8_t unit = 0; 609 connection->data_len = 5; 610 connection->data[0] = 0x07; 611 connection->data[1] = (connection->unit_type << 4) | unit; 612 // company id is 3 bytes long 613 big_endian_store_24(connection->data, 2, connection->company_id); 614 615 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 616 return ERROR_CODE_SUCCESS; 617 } 618 619 // TODO Review 620 static uint8_t avrcp_target_subunit_info(avrcp_connection_t * connection, uint8_t offset){ 621 if (connection->state != AVCTP_CONNECTION_OPENED) return ERROR_CODE_COMMAND_DISALLOWED; 622 if (offset >= 32) return AVRCP_STATUS_INVALID_PARAMETER; 623 624 connection->state = AVCTP_W2_SEND_RESPONSE; 625 626 avrcp_target_custome_command_data_init(connection, AVRCP_CMD_OPCODE_SUBUNIT_INFO, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, 627 AVRCP_SUBUNIT_TYPE_UNIT, AVRCP_SUBUNIT_ID_IGNORE, AVRCP_PDU_ID_UNDEFINED, connection->company_id); 628 629 uint8_t page = offset / 4; 630 uint8_t extension_code = 7; 631 connection->data_len = 5; 632 connection->data[0] = (page << 4) | extension_code; 633 634 // mark non-existent entries with 0xff 635 memset(&connection->cmd_operands[1], 0xFF, 4); 636 if ((connection->data != NULL) && (offset < connection->subunit_info_data_size)){ 637 uint8_t bytes_to_copy = btstack_min(connection->subunit_info_data_size - offset, 4); 638 memcpy(&connection->data[1], &connection->subunit_info_data[offset], bytes_to_copy); 639 } 640 641 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 642 return ERROR_CODE_SUCCESS; 643 } 644 645 static uint8_t avrcp_target_response_vendor_dependent_supported_events(avrcp_connection_t * connection){ 646 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, AVRCP_PDU_ID_GET_CAPABILITIES); 647 connection->state = AVCTP_W2_SEND_RESPONSE; 648 649 uint8_t event_id; 650 uint8_t num_events = 0; 651 for (event_id = (uint8_t) AVRCP_NOTIFICATION_EVENT_FIRST_INDEX; event_id < (uint8_t) AVRCP_NOTIFICATION_EVENT_LAST_INDEX; event_id++){ 652 if ((connection->target_supported_notifications & (1<<event_id)) == 0){ 653 continue; 654 } 655 num_events++; 656 } 657 658 connection->data[0] = AVRCP_CAPABILITY_ID_EVENT; 659 connection->data[1] = num_events; 660 connection->data_len = 2 + num_events; 661 662 // fill the data later directly to the L2CAP outgoing buffer 663 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 664 return ERROR_CODE_SUCCESS; 665 } 666 667 static uint8_t avrcp_target_response_vendor_dependent_supported_companies(avrcp_connection_t * connection){ 668 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, AVRCP_PDU_ID_GET_CAPABILITIES); 669 connection->state = AVCTP_W2_SEND_RESPONSE; 670 671 connection->data[0] = AVRCP_CAPABILITY_ID_COMPANY; 672 connection->data[1] = connection->target_supported_companies_num; 673 connection->data_len = 2 + connection->target_supported_companies_num * 3; 674 675 // fill the data later directly to the L2CAP outgoing buffer and 676 // use Bluetooth SIG as default company 677 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 678 return ERROR_CODE_SUCCESS; 679 } 680 681 uint8_t avrcp_target_support_event(uint16_t avrcp_cid, avrcp_notification_event_id_t event_id){ 682 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 683 if (!connection){ 684 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 685 } 686 687 if ((event_id < (uint8_t)AVRCP_NOTIFICATION_EVENT_FIRST_INDEX) || (event_id > (uint8_t)AVRCP_NOTIFICATION_EVENT_LAST_INDEX)){ 688 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 689 } 690 691 connection->target_supported_notifications |= (1 << (uint8_t)event_id); 692 return ERROR_CODE_SUCCESS; 693 } 694 695 uint8_t avrcp_target_support_companies(uint16_t avrcp_cid, uint8_t num_companies, const uint32_t *companies){ 696 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 697 if (!connection){ 698 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 699 } 700 701 connection->target_supported_companies_num = num_companies; 702 connection->target_supported_companies = companies; 703 return ERROR_CODE_SUCCESS; 704 } 705 706 // TODO Review (use flags) 707 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){ 708 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 709 if (!connection){ 710 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 711 } 712 if (connection->state != AVCTP_CONNECTION_OPENED){ 713 return ERROR_CODE_COMMAND_DISALLOWED; 714 } 715 716 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_IMPLEMENTED_STABLE, AVRCP_PDU_ID_GET_PLAY_STATUS); 717 connection->data_len = 9; 718 big_endian_store_32(connection->data, 0, song_length_ms); 719 big_endian_store_32(connection->data, 4, song_position_ms); 720 connection->data[8] = play_status; 721 722 connection->state = AVCTP_W2_SEND_RESPONSE; 723 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 724 return ERROR_CODE_SUCCESS; 725 } 726 727 static uint8_t avrcp_target_store_media_attr(avrcp_connection_t * connection, avrcp_media_attribute_id_t attr_id, const char * value){ 728 int index = attr_id - 1; 729 if (!value) return AVRCP_STATUS_INVALID_PARAMETER; 730 connection->now_playing_info[index].value = (uint8_t*)value; 731 connection->now_playing_info[index].len = strlen(value); 732 return ERROR_CODE_SUCCESS; 733 } 734 735 uint8_t avrcp_target_set_playback_status(uint16_t avrcp_cid, avrcp_playback_status_t playback_status){ 736 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 737 if (!connection){ 738 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 739 } 740 if (connection->playback_status == playback_status){ 741 return ERROR_CODE_SUCCESS; 742 } 743 744 connection->playback_status = playback_status; 745 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED)) { 746 connection->playback_status_changed = 1; 747 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 748 } 749 return ERROR_CODE_SUCCESS; 750 } 751 752 uint8_t avrcp_target_set_now_playing_info(uint16_t avrcp_cid, const avrcp_track_t * current_track, uint16_t total_tracks){ 753 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 754 if (!connection){ 755 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 756 } 757 if (!current_track){ 758 connection->track_selected = 0; 759 connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR; 760 return ERROR_CODE_COMMAND_DISALLOWED; 761 } 762 763 (void)memcpy(connection->track_id, current_track->track_id, 8); 764 connection->song_length_ms = current_track->song_length_ms; 765 connection->track_nr = current_track->track_nr; 766 connection->total_tracks = total_tracks; 767 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_TITLE, current_track->title); 768 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ARTIST, current_track->artist); 769 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_ALBUM, current_track->album); 770 avrcp_target_store_media_attr(connection, AVRCP_MEDIA_ATTR_GENRE, current_track->genre); 771 772 connection->track_selected = 1; 773 774 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 775 connection->track_changed = 1; 776 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 777 } 778 return ERROR_CODE_SUCCESS; 779 } 780 781 uint8_t avrcp_target_track_changed(uint16_t avrcp_cid, uint8_t * track_id){ 782 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 783 if (!connection){ 784 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 785 } 786 if (!track_id){ 787 return ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE; 788 } 789 790 (void)memcpy(connection->track_id, track_id, 8); 791 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED)) { 792 connection->track_changed = 1; 793 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 794 } 795 return ERROR_CODE_SUCCESS; 796 } 797 798 uint8_t avrcp_target_playing_content_changed(uint16_t avrcp_cid){ 799 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 800 if (!connection){ 801 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 802 } 803 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED)) { 804 connection->playing_content_changed = 1; 805 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 806 } 807 return ERROR_CODE_SUCCESS; 808 } 809 810 uint8_t avrcp_target_addressed_player_changed(uint16_t avrcp_cid, uint16_t player_id, uint16_t uid_counter){ 811 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 812 if (!connection){ 813 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 814 } 815 816 if (connection->addressed_player_id == player_id){ 817 return ERROR_CODE_SUCCESS; 818 } 819 820 connection->uid_counter = uid_counter; 821 connection->addressed_player_id = player_id; 822 823 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED)) { 824 connection->addressed_player_changed = 1; 825 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 826 } 827 return ERROR_CODE_SUCCESS; 828 } 829 830 uint8_t avrcp_target_battery_status_changed(uint16_t avrcp_cid, avrcp_battery_status_t battery_status){ 831 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 832 if (!connection){ 833 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 834 } 835 if (connection->battery_status == battery_status){ 836 return ERROR_CODE_SUCCESS; 837 } 838 839 connection->battery_status = battery_status; 840 841 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED)) { 842 connection->battery_status_changed = 1; 843 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 844 } 845 return ERROR_CODE_SUCCESS; 846 } 847 848 uint8_t avrcp_target_adjust_absolute_volume(uint16_t avrcp_cid, uint8_t absolute_volume){ 849 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 850 if (!connection){ 851 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 852 } 853 854 connection->absolute_volume = absolute_volume; 855 return ERROR_CODE_SUCCESS; 856 } 857 858 uint8_t avrcp_target_volume_changed(uint16_t avrcp_cid, uint8_t absolute_volume){ 859 avrcp_connection_t * connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid); 860 if (!connection){ 861 return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER; 862 } 863 if (connection->absolute_volume == absolute_volume){ 864 return ERROR_CODE_SUCCESS; 865 } 866 867 connection->absolute_volume = absolute_volume; 868 869 if (connection->notifications_enabled & (1 << AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED )) { 870 connection->notify_absolute_volume_changed = 1; 871 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 872 } 873 return ERROR_CODE_SUCCESS; 874 } 875 876 static void avrcp_target_set_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification, uint8_t transaction_label){ 877 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return; 878 connection->notifications_transaction_label[notification] = transaction_label; 879 } 880 881 static uint8_t avrcp_target_get_transaction_label_for_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification){ 882 if (notification > AVRCP_NOTIFICATION_EVENT_MAX_VALUE) return 0; 883 return connection->notifications_transaction_label[notification]; 884 } 885 886 static bool avcrp_operation_id_is_valid(avrcp_operation_id_t operation_id){ 887 if (operation_id < AVRCP_OPERATION_ID_RESERVED_1) return true; 888 889 if (operation_id < AVRCP_OPERATION_ID_0) return false; 890 if (operation_id < AVRCP_OPERATION_ID_RESERVED_2) return true; 891 892 if (operation_id < AVRCP_OPERATION_ID_CHANNEL_UP) return false; 893 if (operation_id < AVRCP_OPERATION_ID_RESERVED_3) return true; 894 895 if (operation_id < AVRCP_OPERATION_ID_CHANNEL_UP) return false; 896 if (operation_id < AVRCP_OPERATION_ID_RESERVED_3) return true; 897 898 if (operation_id < AVRCP_OPERATION_ID_SKIP) return false; 899 if (operation_id == AVRCP_OPERATION_ID_SKIP) return true; 900 901 if (operation_id < AVRCP_OPERATION_ID_POWER) return false; 902 if (operation_id < AVRCP_OPERATION_ID_RESERVED_4) return true; 903 904 if (operation_id < AVRCP_OPERATION_ID_ANGLE) return false; 905 if (operation_id < AVRCP_OPERATION_ID_RESERVED_5) return true; 906 907 if (operation_id < AVRCP_OPERATION_ID_F1) return false; 908 if (operation_id < AVRCP_OPERATION_ID_RESERVED_6) return true; 909 910 return false; 911 } 912 913 914 #ifdef ENABLE_AVCTP_FRAGMENTATION 915 static void avctp_reassemble_message(avrcp_connection_t * connection, avctp_packet_type_t packet_type, uint8_t *packet, uint16_t size){ 916 // after header (transaction label and packet type) 917 uint16_t pos; 918 uint16_t bytes_to_store; 919 920 switch (packet_type){ 921 case AVCTP_START_PACKET: 922 if (size < 2) return; 923 924 // store header 925 pos = 0; 926 connection->avctp_reassembly_buffer[pos] = packet[pos]; 927 pos++; 928 connection->avctp_reassembly_size = pos; 929 930 // NOTE: num packets not needed for reassembly, ignoring it does not pose security risk -> no need to store it 931 pos++; 932 933 // PID in reassembled packet is at offset 1, it will be read later after the avctp_reassemble_message with AVCTP_END_PACKET is called 934 935 bytes_to_store = btstack_min(size - pos, sizeof(connection->avctp_reassembly_buffer) - connection->avctp_reassembly_size); 936 memcpy(&connection->avctp_reassembly_buffer[connection->avctp_reassembly_size], &packet[pos], bytes_to_store); 937 connection->avctp_reassembly_size += bytes_to_store; 938 break; 939 940 case AVCTP_CONTINUE_PACKET: 941 case AVCTP_END_PACKET: 942 if (size < 1) return; 943 944 // store remaining data, ignore header 945 pos = 1; 946 bytes_to_store = btstack_min(size - pos, sizeof(connection->avctp_reassembly_buffer) - connection->avctp_reassembly_size); 947 memcpy(&connection->avctp_reassembly_buffer[connection->avctp_reassembly_size], &packet[pos], bytes_to_store); 948 connection->avctp_reassembly_size += bytes_to_store; 949 break; 950 951 default: 952 return; 953 } 954 } 955 #endif 956 957 static void avrcp_handle_l2cap_data_packet_for_signaling_connection(avrcp_connection_t * connection, uint8_t * packet, uint16_t size){ 958 uint8_t avctp_header = packet[0]; 959 connection->transaction_id = avctp_header >> 4; 960 961 avctp_packet_type_t avctp_packet_type = (avctp_packet_type_t) ((avctp_header & 0x0F) >> 2); 962 switch (avctp_packet_type){ 963 case AVCTP_SINGLE_PACKET: 964 break; 965 966 #ifdef ENABLE_AVCTP_FRAGMENTATION 967 case AVCTP_START_PACKET: 968 case AVCTP_CONTINUE_PACKET: 969 avctp_reassemble_message(connection, avctp_packet_type, packet, size); 970 return; 971 972 case AVCTP_END_PACKET: 973 avctp_reassemble_message(connection, avctp_packet_type, packet, size); 974 975 packet = connection->avctp_reassembly_buffer; 976 size = connection->avctp_reassembly_size; 977 break; 978 #endif 979 default: 980 return; 981 } 982 983 if (size < 6u) return; 984 985 uint16_t pid = big_endian_read_16(packet, 1); 986 987 if (pid != BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL){ 988 log_info("Invalid pid 0x%02x, expected 0x%02x", pid, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL); 989 connection->reject_transport_header = true; 990 connection->invalid_pid = pid; 991 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 992 return; 993 } 994 995 // avrcp_subunit_type_t subunit_type = (avrcp_subunit_type_t) (packet[4] >> 3); 996 // avrcp_subunit_id_t subunit_id = (avrcp_subunit_id_t) (packet[4] & 0x07); 997 998 avrcp_command_opcode_t opcode = (avrcp_command_opcode_t) avrcp_cmd_opcode(packet,size); 999 1000 int pos = 6; 1001 uint16_t length; 1002 avrcp_pdu_id_t pdu_id; 1003 // connection->data_len = 0; 1004 uint8_t offset; 1005 uint8_t operand; 1006 uint16_t event_mask; 1007 avrcp_operation_id_t operation_id; 1008 1009 switch (opcode){ 1010 case AVRCP_CMD_OPCODE_UNIT_INFO: 1011 avrcp_target_unit_info(connection); 1012 break; 1013 case AVRCP_CMD_OPCODE_SUBUNIT_INFO: 1014 if ((size - pos) < 3) return; 1015 // page: packet[pos] >> 4, 1016 offset = 4 * (packet[pos]>>4); 1017 // extension code (fixed 7) = packet[pos] & 0x0F 1018 // 4 bytes paga data, all 0xFF 1019 avrcp_target_subunit_info(connection, offset); 1020 break; 1021 1022 case AVRCP_CMD_OPCODE_PASS_THROUGH: 1023 if (size < 8) return; 1024 log_info("AVRCP_OPERATION_ID 0x%02x, operands length %d", packet[6], packet[7]); 1025 operation_id = (avrcp_operation_id_t) (packet[6] & 0x7f); 1026 operand = 0; 1027 if ((packet[7] >= 1) && (size >= 9)){ 1028 operand = packet[8]; 1029 } 1030 1031 if (avcrp_operation_id_is_valid(operation_id)){ 1032 bool button_pressed = (packet[6] & 0x80) == 0; 1033 1034 avrcp_target_operation_accepted(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], operand); 1035 avrcp_target_emit_operation(avrcp_target_context.avrcp_callback, connection->avrcp_cid, 1036 operation_id, button_pressed, packet[7], operand); 1037 } else { 1038 avrcp_target_operation_not_implemented(connection->avrcp_cid, (avrcp_operation_id_t) packet[6], packet[7], operand); 1039 } 1040 break; 1041 1042 1043 case AVRCP_CMD_OPCODE_VENDOR_DEPENDENT: 1044 1045 if (size < 13) return; 1046 1047 // pos = 6 - company id 1048 (void)memcpy(connection->cmd_operands, &packet[pos], 3); 1049 // connection->data_len = 3; 1050 pos += 3; 1051 // pos = 9 1052 pdu_id = (avrcp_pdu_id_t) packet[pos++]; 1053 // 1 - reserved 1054 pos++; 1055 // 2-3 param length, 1056 length = big_endian_read_16(packet, pos); 1057 pos += 2; 1058 // pos = 13 1059 switch (pdu_id){ 1060 case AVRCP_PDU_ID_SET_ADDRESSED_PLAYER:{ 1061 if ((pos + 2) > size) return; 1062 bool ok = length == 4; 1063 if (avrcp_target_context.set_addressed_player_callback != NULL){ 1064 uint16_t player_id = big_endian_read_16(packet, pos); 1065 ok = avrcp_target_context.set_addressed_player_callback(player_id); 1066 } 1067 if (ok){ 1068 avrcp_target_vendor_dependent_response_accept(connection, pdu_id, AVRCP_STATUS_SUCCESS); 1069 } else { 1070 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PLAYER_ID); 1071 } 1072 break; 1073 } 1074 case AVRCP_PDU_ID_GET_CAPABILITIES:{ 1075 avrcp_capability_id_t capability_id = (avrcp_capability_id_t) packet[pos]; 1076 switch (capability_id){ 1077 case AVRCP_CAPABILITY_ID_EVENT: 1078 avrcp_target_response_vendor_dependent_supported_events(connection); 1079 break; 1080 case AVRCP_CAPABILITY_ID_COMPANY: 1081 avrcp_target_response_vendor_dependent_supported_companies(connection); 1082 break; 1083 default: 1084 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 1085 break; 1086 } 1087 break; 1088 } 1089 case AVRCP_PDU_ID_GET_PLAY_STATUS: 1090 avrcp_target_emit_respond_vendor_dependent_query(avrcp_target_context.avrcp_callback, connection->avrcp_cid, AVRCP_SUBEVENT_PLAY_STATUS_QUERY); 1091 break; 1092 case AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE: 1093 if ((pos + 1) > size) return; 1094 connection->cmd_operands[0] = packet[pos]; 1095 connection->abort_continue_response = 1; 1096 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1097 break; 1098 case AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE: 1099 if ((pos + 1) > size) return; 1100 if (packet[pos] != AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES){ 1101 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1102 return; 1103 } 1104 connection->now_playing_info_response = true; 1105 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1106 break; 1107 case AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES:{ 1108 if ((pos + 9) > size) return; 1109 uint8_t play_identifier[8]; 1110 memset(play_identifier, 0, 8); 1111 if (memcmp(&packet[pos], play_identifier, 8) != 0) { 1112 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 1113 return; 1114 } 1115 pos += 8; 1116 uint8_t attribute_count = packet[pos++]; 1117 connection->next_attr_id = AVRCP_MEDIA_ATTR_NONE; 1118 if (!attribute_count){ 1119 connection->next_attr_id = AVRCP_MEDIA_ATTR_TITLE; 1120 connection->now_playing_info_attr_bitmap = 0xFE; 1121 } else { 1122 int i; 1123 connection->next_attr_id = AVRCP_MEDIA_ATTR_TITLE; 1124 connection->now_playing_info_attr_bitmap = 0; 1125 connection->num_attributes = 0; 1126 if ((pos + attribute_count * 4) > size) return; 1127 for (i=0; i < attribute_count; i++){ 1128 uint32_t attr_id = big_endian_read_32(packet, pos); 1129 connection->now_playing_info_attr_bitmap |= (1 << attr_id); 1130 pos += 4; 1131 } 1132 } 1133 log_info("now_playing_info_attr_bitmap 0x%02x", connection->now_playing_info_attr_bitmap); 1134 connection->num_attributes = count_set_bits_uint32(connection->now_playing_info_attr_bitmap); 1135 connection->now_playing_info_response = true; 1136 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1137 break; 1138 } 1139 case AVRCP_PDU_ID_REGISTER_NOTIFICATION:{ 1140 if ((pos + 1) > size) return; 1141 avrcp_notification_event_id_t event_id = (avrcp_notification_event_id_t) packet[pos]; 1142 1143 avrcp_target_set_transaction_label_for_notification(connection, event_id, connection->transaction_id); 1144 1145 if (event_id < AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED || 1146 event_id > AVRCP_NOTIFICATION_EVENT_MAX_VALUE){ 1147 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_PARAMETER); 1148 return; 1149 } 1150 1151 switch (event_id){ 1152 case AVRCP_NOTIFICATION_EVENT_AVAILABLE_PLAYERS_CHANGED: 1153 case AVRCP_NOTIFICATION_EVENT_PLAYER_APPLICATION_SETTING_CHANGED: 1154 case AVRCP_NOTIFICATION_EVENT_UIDS_CHANGED: 1155 case AVRCP_NOTIFICATION_EVENT_TRACK_REACHED_END: 1156 case AVRCP_NOTIFICATION_EVENT_TRACK_REACHED_START: 1157 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_POS_CHANGED: 1158 case AVRCP_NOTIFICATION_EVENT_SYSTEM_STATUS_CHANGED: 1159 case AVRCP_NOTIFICATION_EVENT_MAX_VALUE: 1160 avrcp_target_response_vendor_dependent_not_implemented(connection, pdu_id, event_id); 1161 return; 1162 default: 1163 break; 1164 } 1165 1166 event_mask = (1 << event_id); 1167 connection->notifications_enabled |= event_mask; 1168 1169 switch (event_id){ 1170 case AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED: 1171 if (connection->track_selected){ 1172 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_SELECTED, 8); 1173 } else { 1174 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, AVRCP_NOTIFICATION_TRACK_NOT_SELECTED, 8); 1175 } 1176 break; 1177 case AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED: 1178 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->playback_status, 1); 1179 break; 1180 case AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED: 1181 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, NULL, 0); 1182 break; 1183 case AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED: 1184 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->absolute_volume, 1); 1185 break; 1186 case AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: 1187 avrcp_target_response_vendor_dependent_interim(connection, pdu_id, event_id, (const uint8_t *)&connection->battery_status, 1); 1188 break; 1189 case AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED: 1190 avrcp_target_response_addressed_player_changed_interim(connection, pdu_id, event_id); 1191 return; 1192 default: 1193 btstack_assert(false); 1194 return; 1195 } 1196 break; 1197 } 1198 case AVRCP_PDU_ID_SET_ABSOLUTE_VOLUME: { 1199 if ( (length != 1) || ((pos + 1) > size)){ 1200 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1201 break; 1202 } 1203 1204 uint8_t absolute_volume = packet[pos]; 1205 if (absolute_volume < 0x80){ 1206 connection->absolute_volume = absolute_volume; 1207 } 1208 avrcp_target_emit_volume_changed(avrcp_target_context.avrcp_callback, connection->avrcp_cid, connection->absolute_volume); 1209 avrcp_target_vendor_dependent_response_accept(connection, pdu_id, connection->absolute_volume); 1210 break; 1211 } 1212 default: 1213 log_info("AVRCP target: unhandled pdu id 0x%02x", pdu_id); 1214 avrcp_target_response_vendor_dependent_reject(connection, pdu_id, AVRCP_STATUS_INVALID_COMMAND); 1215 break; 1216 } 1217 break; 1218 default: 1219 log_info("AVRCP target: opcode 0x%02x not implemented", avrcp_cmd_opcode(packet,size)); 1220 break; 1221 } 1222 } 1223 1224 static void avrcp_target_notification_init(avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id, uint8_t * value, uint16_t value_len){ 1225 btstack_assert((value_len == 0) || (value != NULL)); 1226 1227 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_CHANGED_STABLE, AVRCP_PDU_ID_REGISTER_NOTIFICATION); 1228 connection->transaction_id = avrcp_target_get_transaction_label_for_notification(connection, notification_id); 1229 1230 connection->data_len = 1 + value_len; 1231 connection->data[0] = notification_id; 1232 if (value_len > 0){ 1233 (void)memcpy(connection->data + 1, value, value_len); 1234 } 1235 } 1236 1237 static void avrcp_target_notification_addressed_player_changed_init(avrcp_connection_t * connection){ 1238 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_CHANGED_STABLE, AVRCP_PDU_ID_REGISTER_NOTIFICATION); 1239 connection->transaction_id = avrcp_target_get_transaction_label_for_notification(connection, AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED); 1240 1241 connection->data_len = 5; 1242 connection->data[0] = AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED; 1243 big_endian_store_16(connection->data, 1, connection->addressed_player_id); 1244 big_endian_store_16(connection->data, 3, connection->uid_counter); 1245 } 1246 1247 1248 static void avrcp_target_reset_notification(avrcp_connection_t * connection, avrcp_notification_event_id_t notification_id){ 1249 if (notification_id < AVRCP_NOTIFICATION_EVENT_FIRST_INDEX || notification_id > AVRCP_NOTIFICATION_EVENT_LAST_INDEX){ 1250 return; 1251 } 1252 connection->notifications_enabled &= ~(1 << notification_id); 1253 connection->notifications_transaction_label[notification_id] = 0; 1254 } 1255 1256 static void avrcp_request_next_avctp_segment(avrcp_connection_t * connection){ 1257 // AVCTP 1258 switch (connection->avctp_packet_type){ 1259 case AVCTP_END_PACKET: 1260 case AVCTP_SINGLE_PACKET: 1261 connection->avrcp_frame_bytes_sent = 0; 1262 connection->data_offset = 0; 1263 connection->data_len = 0; 1264 connection->state = AVCTP_CONNECTION_OPENED; 1265 break; 1266 default: 1267 connection->state = AVCTP_W2_SEND_RESPONSE; 1268 avrcp_request_can_send_now(connection, connection->l2cap_signaling_cid); 1269 break; 1270 } 1271 } 1272 1273 static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 1274 avrcp_connection_t * connection; 1275 bool send_response = true; 1276 avrcp_notification_event_id_t notification_id = AVRCP_NOTIFICATION_EVENT_NONE; 1277 1278 switch (packet_type){ 1279 case L2CAP_DATA_PACKET: 1280 connection = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1281 avrcp_handle_l2cap_data_packet_for_signaling_connection(connection, packet, size); 1282 return; 1283 1284 case HCI_EVENT_PACKET: 1285 if (hci_event_packet_get_type(packet) != L2CAP_EVENT_CAN_SEND_NOW){ 1286 return; 1287 } 1288 1289 connection = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, channel); 1290 if (connection == NULL){ 1291 return; 1292 } 1293 1294 // START AVCTP 1295 if (connection->reject_transport_header){ 1296 connection->reject_transport_header = false; 1297 avctp_send_reject_cmd_wrong_pid(connection); 1298 connection->state = AVCTP_CONNECTION_OPENED; 1299 return; 1300 } 1301 // END AVCTP 1302 1303 if (connection->accept_response){ 1304 connection->accept_response = 0; 1305 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, AVRCP_PDU_ID_REQUEST_CONTINUING_RESPONSE); 1306 break; 1307 } 1308 1309 if (connection->abort_continue_response){ 1310 connection->abort_continue_response = 0; 1311 connection->now_playing_info_response = false; 1312 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, AVRCP_PDU_ID_REQUEST_ABORT_CONTINUING_RESPONSE); 1313 break; 1314 } 1315 1316 if (connection->now_playing_info_response){ 1317 connection->now_playing_info_response = false; 1318 avrcp_target_vendor_dependent_response_data_init(connection, AVRCP_CTYPE_RESPONSE_ACCEPTED, AVRCP_PDU_ID_GET_ELEMENT_ATTRIBUTES); 1319 connection->data_len = avrcp_now_playing_info_value_len_with_headers(connection); 1320 break; 1321 } 1322 1323 if (connection->track_changed){ 1324 connection->track_changed = 0; 1325 notification_id = AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED; 1326 avrcp_target_notification_init(connection, notification_id, connection->track_id, 8); 1327 break; 1328 } 1329 1330 if (connection->playback_status_changed){ 1331 connection->playback_status_changed = 0; 1332 notification_id = AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED; 1333 uint8_t playback_status = (uint8_t) connection->playback_status; 1334 avrcp_target_notification_init(connection, notification_id, &playback_status, 1); 1335 break; 1336 } 1337 1338 if (connection->playing_content_changed){ 1339 connection->playing_content_changed = 0; 1340 notification_id = AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED; 1341 avrcp_target_notification_init(connection, notification_id, NULL, avrcp_now_playing_info_value_len_with_headers(connection)); 1342 break; 1343 } 1344 1345 if (connection->battery_status_changed){ 1346 connection->battery_status_changed = 0; 1347 notification_id = AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED; 1348 avrcp_target_notification_init(connection, notification_id, (uint8_t *)&connection->battery_status, 1); 1349 break; 1350 } 1351 1352 if (connection->notify_absolute_volume_changed){ 1353 connection->notify_absolute_volume_changed = 0; 1354 notification_id = AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED; 1355 avrcp_target_notification_init(connection, notification_id, &connection->absolute_volume, 1); 1356 break; 1357 } 1358 1359 if (connection->addressed_player_changed){ 1360 connection->addressed_player_changed = 0; 1361 notification_id = AVRCP_NOTIFICATION_EVENT_ADDRESSED_PLAYER_CHANGED; 1362 avrcp_target_notification_addressed_player_changed_init(connection); 1363 break; 1364 } 1365 1366 send_response = false; 1367 break; 1368 1369 default: 1370 return; 1371 } 1372 1373 if (connection != NULL && (send_response || connection->state == AVCTP_W2_SEND_RESPONSE)){ 1374 avrcp_send_response_with_avctp_fragmentation(connection); 1375 avrcp_target_reset_notification(connection, notification_id); 1376 avrcp_request_next_avctp_segment(connection); 1377 } 1378 } 1379 1380 void avrcp_target_init(void){ 1381 avrcp_target_context.role = AVRCP_TARGET; 1382 avrcp_target_context.packet_handler = avrcp_target_packet_handler; 1383 avrcp_register_target_packet_handler(&avrcp_target_packet_handler); 1384 } 1385 1386 void avrcp_target_deinit(void){ 1387 memset(&avrcp_target_context, 0, sizeof(avrcp_context_t)); 1388 } 1389 1390 void avrcp_target_register_packet_handler(btstack_packet_handler_t callback){ 1391 btstack_assert(callback != NULL); 1392 avrcp_target_context.avrcp_callback = callback; 1393 } 1394 1395 void avrcp_target_register_set_addressed_player_handler(bool (*callback)(uint16_t player_id)){ 1396 btstack_assert(callback != NULL); 1397 avrcp_target_context.set_addressed_player_callback = callback; 1398 } 1399 1400 1401