1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "avrcp_browsing_client.c" 39 40 /* 41 * avrcp_browsing_client.c 42 */ 43 44 // ***************************************************************************** 45 /* EXAMPLE_START(avrcp_browsing_client): Browse media players and media information on a remote device. 46 * 47 * @text This example demonstrates how to use the AVRCP Controller Browsing service to 48 * browse madia players and media information on a remote AVRCP Source device. 49 * 50 * @test To test with a remote device, e.g. a mobile phone, 51 * pair from the remote device with the demo, then use the UI for browsing (tap 52 * SPACE on the console to show the available AVRCP commands). 53 * 54 */ 55 // ***************************************************************************** 56 57 #include <stdint.h> 58 #include <inttypes.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include "btstack.h" 64 65 #ifdef HAVE_BTSTACK_STDIN 66 #include "btstack_stdin.h" 67 #endif 68 69 #define AVRCP_BROWSING_ENABLED 70 71 #define AVRCP_BROWSING_MAX_PLAYERS 10 72 #define AVRCP_BROWSING_MAX_FOLDERS 10 73 #define AVRCP_BROWSING_MAX_FOLDER_NAME_LEN 30 74 75 #ifdef HAVE_BTSTACK_STDIN 76 // mac 2011: static bd_addr_t remote = {0x04, 0x0C, 0xCE, 0xE4, 0x85, 0xD3}; 77 // pts: static bd_addr_t remote = {0x00, 0x1B, 0xDC, 0x08, 0x0A, 0xA5}; 78 // mac 2013: 79 // static const char * device_addr_string = "84:38:35:65:d1:15"; 80 // iPhone 5S: static const char * device_addr_string = "54:E4:3A:26:A2:39"; 81 // phone 2013: 82 // static const char * device_addr_string = "B0:34:95:CB:97:C4"; 83 84 static const char * device_addr_string = "B0:34:95:CB:97:C4"; 85 86 static bd_addr_t device_addr; 87 #endif 88 89 static uint16_t avrcp_cid = 0; 90 static uint8_t avrcp_connected = 0; 91 92 static uint16_t browsing_cid = 0; 93 static uint8_t avrcp_browsing_connected = 0; 94 static uint8_t sdp_avrcp_browsing_controller_service_buffer[200]; 95 96 static uint8_t browsing_query_active = 0; 97 static avrcp_media_item_context_t media_item_context; 98 99 typedef struct { 100 uint16_t charset; 101 uint8_t depth; 102 uint16_t name_len; 103 char name[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 104 } avrcp_browsing_root_folder_t; 105 106 typedef struct { 107 uint8_t uid[8]; 108 uint16_t name_len; 109 char name[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 110 } avrcp_browsing_folders_t; 111 112 static uint8_t parent_folder_set = 0; 113 static uint8_t parent_folder_uid[8]; 114 static char parent_folder_name[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 115 static avrcp_browsing_folders_t folders[AVRCP_BROWSING_MAX_FOLDERS]; 116 static int folder_index = -1; 117 static uint16_t players[AVRCP_BROWSING_MAX_PLAYERS]; 118 static int player_index = -1; 119 static uint16_t browsing_uid_counter = 0; 120 121 static btstack_packet_callback_registration_t hci_event_callback_registration; 122 123 static uint8_t ertm_buffer[10000]; 124 static l2cap_ertm_config_t ertm_config = { 125 1, // ertm mandatory 126 2, // max transmit, some tests require > 1 127 2000, 128 12000, 129 144, // l2cap ertm mtu 130 4, 131 4, 132 0, // No FCS 133 }; 134 135 136 static inline int next_index(int * index, int max_value){ 137 if ((*index) < max_value){ 138 (*index)++; 139 } else { 140 (*index) = 0; 141 } 142 return (*index); 143 } 144 145 static int next_folder_index(void){ 146 return next_index(&folder_index, AVRCP_BROWSING_MAX_FOLDERS); 147 } 148 149 static int next_player_index(void){ 150 return next_index(&player_index, AVRCP_BROWSING_MAX_PLAYERS); 151 } 152 153 154 /* @section Main Application Setup 155 * 156 * @text The Listing MainConfiguration shows how to setup AVRCP Controller Browsing service. 157 * To announce AVRCP Controller Browsing service, you need to create corresponding 158 * SDP record and register it with the SDP service. 159 * You'll also need to register several packet handlers: 160 * - stdin_process callback - used to trigger AVRCP commands, such are get media players, playlists, albums, etc. Requires HAVE_BTSTACK_STDIN. 161 * - avrcp_browsing_controller_packet_handler - used to receive answers for AVRCP commands. 162 * 163 */ 164 165 /* LISTING_START(MainConfiguration): Setup Audio Sink and AVRCP Controller services */ 166 static void avrcp_browsing_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 167 #ifdef HAVE_BTSTACK_STDIN 168 static void stdin_process(char cmd); 169 #endif 170 171 172 int btstack_main(int argc, const char * argv[]); 173 int btstack_main(int argc, const char * argv[]){ 174 (void)argc; 175 (void)argv; 176 177 // Initialize L2CAP. 178 l2cap_init(); 179 180 // Initialize AVRCP service. 181 avrcp_init(); 182 // Initialize AVRCP Controller. 183 avrcp_controller_init(); 184 185 // Initialize AVRCP Browsing Controller, HCI events will be sent to the AVRCP Controller callback. 186 avrcp_browsing_controller_init(); 187 // // Register AVRCP for HCI events. 188 avrcp_browsing_controller_register_packet_handler(&avrcp_browsing_controller_packet_handler); 189 190 // Initialize SDP. 191 sdp_init(); 192 193 // Create AVRCP service record and register it with SDP. 194 memset(sdp_avrcp_browsing_controller_service_buffer, 0, sizeof(sdp_avrcp_browsing_controller_service_buffer)); 195 196 uint16_t supported_features = (1 << AVRCP_CONTROLLER_SUPPORTED_FEATURE_CATEGORY_PLAYER_OR_RECORDER); 197 #ifdef AVRCP_BROWSING_ENABLED 198 supported_features |= (1 << AVRCP_CONTROLLER_SUPPORTED_FEATURE_BROWSING); 199 #endif 200 avrcp_controller_create_sdp_record(sdp_avrcp_browsing_controller_service_buffer, 0x10001, supported_features, NULL, NULL); 201 sdp_register_service(sdp_avrcp_browsing_controller_service_buffer); 202 203 // Set local name with a template Bluetooth address, that will be automatically 204 // replaced with a actual address once it is available, i.e. when BTstack boots 205 // up and starts talking to a Bluetooth module. 206 gap_set_local_name("AVRCP Browsing Client 00:00:00:00:00:00"); 207 gap_discoverable_control(1); 208 gap_set_class_of_device(0x200408); 209 210 // Register for HCI events. 211 hci_event_callback_registration.callback = &avrcp_browsing_controller_packet_handler; 212 hci_add_event_handler(&hci_event_callback_registration); 213 214 // Register for AVRCP events. 215 avrcp_controller_register_packet_handler(&avrcp_browsing_controller_packet_handler); 216 217 218 #ifdef HAVE_BTSTACK_STDIN 219 // Parse human readable Bluetooth address. 220 sscanf_bd_addr(device_addr_string, device_addr); 221 btstack_stdin_setup(stdin_process); 222 #endif 223 printf("Starting BTstack ...\n"); 224 hci_power_control(HCI_POWER_ON); 225 return 0; 226 } 227 /* LISTING_END */ 228 229 static void avrcp_browsing_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 230 UNUSED(channel); 231 int pos; 232 233 switch(packet_type){ 234 case AVRCP_BROWSING_DATA_PACKET: 235 pos = 0; 236 browsing_query_active = 1; 237 avrcp_browsing_item_type_t data_type = (avrcp_browsing_item_type_t)packet[pos++]; 238 pos += 2; // length 239 240 switch (data_type){ 241 case AVRCP_BROWSING_MEDIA_ROOT_FOLDER:{ 242 avrcp_browsing_root_folder_t root_folder; 243 root_folder.charset = big_endian_read_16(packet, pos); 244 pos += 2; 245 root_folder.depth = packet[pos++]; 246 root_folder.name_len = big_endian_read_16(packet, pos); 247 pos += 2; 248 249 memset(root_folder.name, 0, AVRCP_BROWSING_MAX_FOLDER_NAME_LEN); 250 root_folder.name_len = btstack_min(big_endian_read_16(packet, pos), AVRCP_BROWSING_MAX_FOLDER_NAME_LEN - 1); 251 memcpy(root_folder.name, packet+pos, root_folder.name_len); 252 printf("Found root folder: name %s, depth %d \n", (char *)root_folder.name, root_folder.depth); 253 break; 254 } 255 case AVRCP_BROWSING_MEDIA_PLAYER_ITEM:{ 256 printf("Received media player: "); 257 uint16_t player_id = big_endian_read_16(packet, pos); 258 pos += 2; 259 avrcp_browsing_media_player_major_type_t major_type = packet[pos++]; 260 avrcp_browsing_media_player_subtype_t subtype = big_endian_read_32(packet, pos); 261 pos += 4; 262 uint8_t status = packet[pos++]; 263 uint8_t feature_bitmask[16]; 264 memcpy(feature_bitmask, packet, 16); 265 pos += 16; 266 printf("player ID 0x%04x, major_type %d, subtype %d, status %d\n", player_id, major_type, subtype, status); 267 players[next_player_index()] = player_id; 268 break; 269 } 270 case AVRCP_BROWSING_FOLDER_ITEM:{ 271 int index = next_folder_index(); 272 // printf("Found folder [%d]: ", index); 273 memcpy(folders[index].uid, packet+pos, 8); 274 uint32_t folder_uid_high = big_endian_read_32(packet, pos); 275 pos += 4; 276 uint32_t folder_uid_low = big_endian_read_32(packet, pos); 277 pos += 4; 278 avrcp_browsing_folder_type_t folder_type = packet[pos++]; 279 uint8_t is_playable = packet[pos++]; 280 uint16_t charset = big_endian_read_16(packet, pos); 281 pos += 2; 282 uint16_t displayable_name_length = big_endian_read_16(packet, pos); 283 pos += 2; 284 285 char value[AVRCP_BROWSING_MAX_FOLDER_NAME_LEN]; 286 287 memset(value, 0, AVRCP_BROWSING_MAX_FOLDER_NAME_LEN); 288 uint16_t value_len = btstack_min(displayable_name_length, AVRCP_BROWSING_MAX_FOLDER_NAME_LEN - 1); 289 memcpy(value, packet+pos, value_len); 290 291 printf("UID 0x%08" PRIx32 "%08" PRIx32 ", type 0x%02x, is_playable %d, charset 0x%02x, name %s\n", 292 folder_uid_high, folder_uid_low, folder_type, is_playable, charset, value); 293 memcpy(folders[index].name, value, value_len); 294 folders[index].name_len = value_len; 295 break; 296 } 297 case AVRCP_BROWSING_MEDIA_ELEMENT_ITEM:{ 298 printf("Found media: "); 299 300 uint32_t media_uid_high = big_endian_read_32(packet, pos); 301 pos += 4; 302 uint32_t media_uid_low = big_endian_read_32(packet, pos+4); 303 pos += 4; 304 avrcp_browsing_media_type_t media_type = packet[pos++]; 305 uint16_t charset = big_endian_read_16(packet, pos); 306 pos += 2; 307 uint16_t displayable_name_length = big_endian_read_16(packet, pos); 308 pos += 2; 309 pos += displayable_name_length; 310 printf("Media UID: 0x%08" PRIx32 "%08" PRIx32 ", media_type 0x%02x, charset 0x%02x, displayable_name_length %d\n", media_uid_high, media_uid_low, media_type, charset, displayable_name_length); 311 312 uint8_t num_attributes = packet[pos++]; 313 printf("Num media attributes %d\n", num_attributes); 314 315 for (avrcp_media_item_iterator_init(&media_item_context, size-pos, packet+pos); avrcp_media_item_iterator_has_more(&media_item_context); avrcp_media_item_iterator_next(&media_item_context)){ 316 uint32_t attr_id = avrcp_media_item_iterator_get_attr_id(&media_item_context); 317 uint16_t attr_charset = avrcp_media_item_iterator_get_attr_charset(&media_item_context); 318 uint16_t attr_value_length = avrcp_media_item_iterator_get_attr_value_len(&media_item_context); 319 const uint8_t * attr_value = avrcp_media_item_iterator_get_attr_value(&media_item_context); 320 321 printf("Attr ID 0x%08" PRIx32 ", charset %d, attr_value_length %d, value %s", attr_id, attr_charset, attr_value_length, attr_value); 322 } 323 break; 324 } 325 326 default: 327 log_error("AVRCP browsing: unknown browsable item type 0%02x", data_type); 328 break; 329 } 330 break; 331 case HCI_EVENT_PACKET: 332 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; 333 uint16_t local_cid; 334 uint8_t status = 0xFF; 335 bd_addr_t address; 336 337 if (packet[0] != HCI_EVENT_AVRCP_META) break; 338 switch (packet[2]){ 339 case AVRCP_SUBEVENT_CONNECTION_ESTABLISHED: { 340 local_cid = avrcp_subevent_connection_established_get_avrcp_cid(packet); 341 printf("AVRCP_SUBEVENT_CONNECTION_ESTABLISHED cid 0x%02x\n", local_cid); 342 343 if (avrcp_cid != 0 && avrcp_cid != local_cid) { 344 printf("AVRCP Controller connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", avrcp_cid, local_cid); 345 return; 346 } 347 348 status = avrcp_subevent_connection_established_get_status(packet); 349 if (status != ERROR_CODE_SUCCESS){ 350 printf("AVRCP Controller connection failed: status 0x%02x\n", status); 351 avrcp_cid = 0; 352 return; 353 } 354 355 avrcp_cid = local_cid; 356 avrcp_connected = 1; 357 avrcp_subevent_connection_established_get_bd_addr(packet, address); 358 printf("AVRCP Controller connected.\n"); 359 return; 360 } 361 case AVRCP_SUBEVENT_CONNECTION_RELEASED: 362 printf("AVRCP Controller Client released.\n"); 363 avrcp_cid = 0; 364 avrcp_browsing_connected = 0; 365 folder_index = 0; 366 memset(folders, 0, sizeof(folders)); 367 return; 368 369 case AVRCP_SUBEVENT_INCOMING_BROWSING_CONNECTION: 370 local_cid = avrcp_subevent_incoming_browsing_connection_get_browsing_cid(packet); 371 printf("AVRCP_SUBEVENT_INCOMING_BROWSING_CONNECTION cid 0x%02x\n", local_cid); 372 if (browsing_cid != 0 && browsing_cid != local_cid) { 373 printf("AVRCP Browsing Client connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", browsing_cid, local_cid); 374 avrcp_browsing_controller_decline_incoming_connection(browsing_cid); 375 return; 376 } 377 browsing_cid = local_cid; 378 printf("AVRCP Browsing Client configure incoming connection, browsing cid 0x%02x\n", browsing_cid); 379 avrcp_browsing_controller_configure_incoming_connection(browsing_cid, ertm_buffer, sizeof(ertm_buffer), &ertm_config); 380 break; 381 382 case AVRCP_SUBEVENT_BROWSING_CONNECTION_ESTABLISHED: { 383 local_cid = avrcp_subevent_browsing_connection_established_get_browsing_cid(packet); 384 printf("AVRCP_SUBEVENT_BROWSING_CONNECTION_ESTABLISHED cid 0x%02x\n", local_cid); 385 if (browsing_cid != 0 && browsing_cid != local_cid) { 386 printf("AVRCP Browsing Client connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", browsing_cid, local_cid); 387 return; 388 } 389 390 status = avrcp_subevent_browsing_connection_established_get_status(packet); 391 if (status != ERROR_CODE_SUCCESS){ 392 printf("AVRCP Browsing Client connection failed: status 0x%02x\n", status); 393 browsing_cid = 0; 394 return; 395 } 396 397 browsing_cid = local_cid; 398 avrcp_browsing_connected = 1; 399 avrcp_subevent_browsing_connection_established_get_bd_addr(packet, address); 400 printf("AVRCP Browsing Client connected\n"); 401 return; 402 } 403 case AVRCP_SUBEVENT_BROWSING_CONNECTION_RELEASED: 404 printf("AVRCP Browsing Controller released\n"); 405 browsing_cid = 0; 406 avrcp_browsing_connected = 0; 407 return; 408 409 case AVRCP_SUBEVENT_BROWSING_DONE: 410 browsing_query_active = 0; 411 browsing_uid_counter = 0; 412 if (avrcp_subevent_browsing_done_get_browsing_status(packet) != AVRCP_BROWSING_ERROR_CODE_SUCCESS){ 413 printf("AVRCP Browsing query done with browsing status 0x%02x, bluetooth status 0x%02x.\n", 414 avrcp_subevent_browsing_done_get_browsing_status(packet), 415 avrcp_subevent_browsing_done_get_bluetooth_status(packet)); 416 break; 417 } 418 browsing_uid_counter = avrcp_subevent_browsing_done_get_uid_counter(packet); 419 printf("DONE, browsing_uid_counter %d.\n", browsing_uid_counter); 420 break; 421 422 default: 423 break; 424 } 425 break; 426 427 default: 428 break; 429 } 430 431 } 432 433 #ifdef HAVE_BTSTACK_STDIN 434 static void show_usage(void){ 435 bd_addr_t iut_address; 436 gap_local_bd_addr(iut_address); 437 printf("\n--- Bluetooth AVRCP Controller Connection Test Console %s ---\n", bd_addr_to_str(iut_address)); 438 printf("c - AVRCP create connection to addr %s\n", bd_addr_to_str(device_addr)); 439 printf("C - AVRCP disconnect\n"); 440 printf("e - AVRCP Browsing Controller create connection to addr %s\n", bd_addr_to_str(device_addr)); 441 printf("E - AVRCP Browsing Controller disconnect\n"); 442 443 printf("I - Set first found player as addressed player\n"); 444 printf("O - Set first found player as browsed player\n"); 445 446 printf("p - Get media players\n"); 447 printf("Q - Browse folders\n"); 448 printf("P - Go up one level\n"); 449 printf("W - Go down one level\n"); 450 printf("T - Browse media items\n"); 451 printf("---\n"); 452 } 453 #endif 454 455 456 #ifdef HAVE_BTSTACK_STDIN 457 static void stdin_process(char cmd){ 458 uint8_t status = ERROR_CODE_SUCCESS; 459 460 if (cmd != 'a' && cmd != 'A' && cmd != 'c' && cmd != 'C'){ 461 if (browsing_query_active){ 462 printf("Query active, try later!\n"); 463 return; 464 } 465 } 466 467 switch (cmd){ 468 case 'c': 469 printf(" - Create AVRCP connection for control to addr %s.\n", bd_addr_to_str(device_addr)); 470 status = avrcp_connect(device_addr, &avrcp_cid); 471 break; 472 case 'C': 473 if (avrcp_connected){ 474 printf(" - AVRCP disconnect from addr %s.\n", bd_addr_to_str(device_addr)); 475 status = avrcp_disconnect(avrcp_cid); 476 break; 477 } 478 printf("AVRCP service already disconnected\n"); 479 break; 480 481 case 'e': 482 if (!avrcp_connected) { 483 printf(" You must first create AVRCP connection for control to addr %s.\n", bd_addr_to_str(device_addr)); 484 break; 485 } 486 printf(" - Create AVRCP connection for browsing to addr %s.\n", bd_addr_to_str(device_addr)); 487 status = avrcp_browsing_controller_connect(device_addr, ertm_buffer, sizeof(ertm_buffer), &ertm_config, &browsing_cid); 488 break; 489 case 'E': 490 if (avrcp_browsing_connected){ 491 printf(" - AVRCP Browsing Controller disconnect from addr %s.\n", bd_addr_to_str(device_addr)); 492 status = avrcp_browsing_controller_disconnect(browsing_cid); 493 break; 494 } 495 printf("AVRCP Browsing Controller already disconnected\n"); 496 break; 497 case '\n': 498 case '\r': 499 break; 500 501 default: 502 if (!avrcp_browsing_connected){ 503 show_usage(); 504 printf("Please connect the AVRCP Browsing client\n"); 505 break; 506 } 507 508 switch (cmd) { 509 case 'I': 510 if (player_index < 0) { 511 printf("Get media players first\n"); 512 break; 513 } 514 printf("Set addressed player\n"); 515 status = avrcp_controller_set_addressed_player(avrcp_cid, players[0]); 516 break; 517 case 'O': 518 if (player_index < 0) { 519 printf("Get media players first\n"); 520 break; 521 } 522 printf("Set browsed player\n"); 523 status = avrcp_browsing_controller_set_browsed_player(browsing_cid, players[0]); 524 break; 525 case 'p': 526 printf("AVRCP Browsing: get media players\n"); 527 player_index = -1; 528 status = avrcp_browsing_controller_get_media_players(browsing_cid, 0, 0xFFFFFFFF, AVRCP_MEDIA_ATTR_ALL); 529 break; 530 case 'Q': 531 printf("AVRCP Browsing: browse folders\n"); 532 folder_index = -1; 533 status = avrcp_browsing_controller_browse_file_system(browsing_cid, 0, 0xFFFFFFFF, AVRCP_MEDIA_ATTR_ALL); 534 break; 535 case 'P': 536 printf("AVRCP Browsing: browse media items\n"); 537 avrcp_browsing_controller_browse_media(browsing_cid, 0, 0xFFFFFFFF, AVRCP_MEDIA_ATTR_ALL); 538 break; 539 case 'W': 540 printf("AVRCP Browsing: go up one level\n"); 541 status = avrcp_browsing_controller_go_up_one_level(browsing_cid); 542 folder_index = -1; 543 break; 544 case 'T': 545 if (folder_index < 0 && !parent_folder_set){ 546 printf("AVRCP Browsing: no folders available\n"); 547 break; 548 } 549 if (!parent_folder_set){ 550 parent_folder_set = 1; 551 memcpy(parent_folder_name, folders[0].name, folders[0].name_len); 552 memcpy(parent_folder_uid, folders[0].uid, 8); 553 } 554 printf("AVRCP Browsing: go down one level of %s\n", (char *)parent_folder_name); 555 status = avrcp_browsing_controller_go_down_one_level(browsing_cid, parent_folder_uid); 556 folder_index = -1; 557 break; 558 default: 559 show_usage(); 560 break; 561 } 562 break; 563 } 564 565 if (status != ERROR_CODE_SUCCESS){ 566 printf("Could not perform command, status 0x%2x\n", status); 567 } 568 } 569 #endif 570 /* EXAMPLE_END */ 571