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btstack/src/classic/avrcp.c
Matthias Ringwald 14fd128c5a sdp queries: check if DES element exist before reading it
2018-10-01 17:50:00 +02:00

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/*
* Copyright (C) 2016 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define __BTSTACK_FILE__ "avrcp.c"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#include "classic/avrcp.h"
#include "classic/avrcp_controller.h"
#define PSM_AVCTP BLUETOOTH_PROTOCOL_AVCTP
#define PSM_AVCTP_BROWSING 0x001b
/*
Category 1: Player/Recorder
Category 2: Monitor/Amplifier
Category 3: Tuner
Category 4: Menu
*/
/* controller supported features
Bit 0 = Category 1
Bit 1 = Category 2
Bit 2 = Category 3
Bit 3 = Category 4
Bit 4-5 = RFA
Bit 6 = Supports browsing
Bit 7-15 = RFA
The bits for supported categories are set to 1. Others are set to 0.
*/
/* target supported features
Bit 0 = Category 1
Bit 1 = Category 2
Bit 2 = Category 3
Bit 3 = Category 4
Bit 4 = Player Application Settings. Bit 0 should be set for this bit to be set.
Bit 5 = Group Navigation. Bit 0 should be set for this bit to be set.
Bit 6 = Supports browsing*4
Bit 7 = Supports multiple media player applications
Bit 8-15 = RFA
The bits for supported categories are set to 1. Others are set to 0.
*/
static const char * default_avrcp_controller_service_name = "BTstack AVRCP Controller Service";
static const char * default_avrcp_controller_service_provider_name = "BTstack AVRCP Controller Service Provider";
static const char * default_avrcp_target_service_name = "BTstack AVRCP Target Service";
static const char * default_avrcp_target_service_provider_name = "BTstack AVRCP Target Service Provider";
static uint16_t avrcp_cid_counter = 0;
static avrcp_context_t * sdp_query_context;
static uint8_t attribute_value[1000];
static const unsigned int attribute_value_buffer_size = sizeof(attribute_value);
static const char * avrcp_subunit_type_name[] = {
"MONITOR", "AUDIO", "PRINTER", "DISC", "TAPE_RECORDER_PLAYER", "TUNER",
"CA", "CAMERA", "RESERVED", "PANEL", "BULLETIN_BOARD", "CAMERA_STORAGE",
"VENDOR_UNIQUE", "RESERVED_FOR_ALL_SUBUNIT_TYPES",
"EXTENDED_TO_NEXT_BYTE", "UNIT", "ERROR"
};
const char * avrcp_subunit2str(uint16_t index){
if (index <= 11) return avrcp_subunit_type_name[index];
if (index >= 0x1C && index <= 0x1F) return avrcp_subunit_type_name[index - 0x10];
return avrcp_subunit_type_name[16];
}
static const char * avrcp_event_name[] = {
"ERROR", "PLAYBACK_STATUS_CHANGED",
"TRACK_CHANGED", "TRACK_REACHED_END", "TRACK_REACHED_START",
"PLAYBACK_POS_CHANGED", "BATT_STATUS_CHANGED", "SYSTEM_STATUS_CHANGED",
"PLAYER_APPLICATION_SETTING_CHANGED", "NOW_PLAYING_CONTENT_CHANGED",
"AVAILABLE_PLAYERS_CHANGED", "ADDRESSED_PLAYER_CHANGED", "UIDS_CHANGED", "VOLUME_CHANGED"
};
const char * avrcp_event2str(uint16_t index){
if (index <= 0x0d) return avrcp_event_name[index];
return avrcp_event_name[0];
}
static const char * avrcp_operation_name[] = {
"NOT SUPPORTED", // 0x3B
"SKIP", "NOT SUPPORTED", "NOT SUPPORTED", "NOT SUPPORTED", "NOT SUPPORTED",
"VOLUME_UP", "VOLUME_DOWN", "MUTE", "PLAY", "STOP", "PAUSE", "NOT SUPPORTED",
"REWIND", "FAST_FORWARD", "NOT SUPPORTED", "FORWARD", "BACKWARD" // 0x4C
};
const char * avrcp_operation2str(uint8_t index){
if (index >= 0x3B && index <= 0x4C) return avrcp_operation_name[index - 0x3B];
return avrcp_operation_name[0];
}
static const char * avrcp_media_attribute_id_name[] = {
"NONE", "TITLE", "ARTIST", "ALBUM", "TRACK", "TOTAL TRACKS", "GENRE", "SONG LENGTH"
};
const char * avrcp_attribute2str(uint8_t index){
if (index >= 1 && index <= 7) return avrcp_media_attribute_id_name[index];
return avrcp_media_attribute_id_name[0];
}
static const char * avrcp_play_status_name[] = {
"STOPPED", "PLAYING", "PAUSED", "FORWARD SEEK", "REVERSE SEEK",
"ERROR" // 0xFF
};
const char * avrcp_play_status2str(uint8_t index){
if (index >= 1 && index <= 4) return avrcp_play_status_name[index];
return avrcp_play_status_name[5];
}
static const char * avrcp_ctype_name[] = {
"CONTROL",
"STATUS",
"SPECIFIC_INQUIRY",
"NOTIFY",
"GENERAL_INQUIRY",
"RESERVED5",
"RESERVED6",
"RESERVED7",
"NOT IMPLEMENTED IN REMOTE",
"ACCEPTED BY REMOTE",
"REJECTED BY REMOTE",
"IN_TRANSITION",
"IMPLEMENTED_STABLE",
"CHANGED_STABLE",
"RESERVED",
"INTERIM"
};
const char * avrcp_ctype2str(uint8_t index){
if (index < sizeof(avrcp_ctype_name)){
return avrcp_ctype_name[index];
}
return "NONE";
}
static const char * avrcp_shuffle_mode_name[] = {
"SHUFFLE OFF",
"SHUFFLE ALL TRACKS",
"SHUFFLE GROUP"
};
const char * avrcp_shuffle2str(uint8_t index){
if (index >= 1 && index <= 3) return avrcp_shuffle_mode_name[index-1];
return "NONE";
}
static const char * avrcp_repeat_mode_name[] = {
"REPEAT OFF",
"REPEAT SINGLE TRACK",
"REPEAT ALL TRACKS",
"REPEAT GROUP"
};
const char * avrcp_repeat2str(uint8_t index){
if (index >= 1 && index <= 4) return avrcp_repeat_mode_name[index-1];
return "NONE";
}
uint8_t avrcp_cmd_opcode(uint8_t *packet, uint16_t size){
uint8_t cmd_opcode_index = 5;
if (cmd_opcode_index > size) return AVRCP_CMD_OPCODE_UNDEFINED;
return packet[cmd_opcode_index];
}
void avrcp_create_sdp_record(uint8_t controller, uint8_t * service, uint32_t service_record_handle, uint8_t browsing, uint16_t supported_features,
const char * service_name, const char * service_provider_name){
uint8_t* attribute;
de_create_sequence(service);
// 0x0000 "Service Record Handle"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE);
de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle);
// 0x0001 "Service Class ID List"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST);
attribute = de_push_sequence(service);
{
if (controller){
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL);
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_CONTROLLER);
} else {
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_TARGET);
}
}
de_pop_sequence(service, attribute);
// 0x0004 "Protocol Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST);
attribute = de_push_sequence(service);
{
uint8_t* l2cpProtocol = de_push_sequence(attribute);
{
de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP);
de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVCTP);
}
de_pop_sequence(attribute, l2cpProtocol);
uint8_t* avctpProtocol = de_push_sequence(attribute);
{
de_add_number(avctpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVCTP); // avctpProtocol_service
de_add_number(avctpProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version
}
de_pop_sequence(attribute, avctpProtocol);
}
de_pop_sequence(service, attribute);
// 0x0005 "Public Browse Group"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group
attribute = de_push_sequence(service);
{
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT);
}
de_pop_sequence(service, attribute);
// 0x0009 "Bluetooth Profile Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST);
attribute = de_push_sequence(service);
{
uint8_t *avrcProfile = de_push_sequence(attribute);
{
de_add_number(avrcProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL);
de_add_number(avrcProfile, DE_UINT, DE_SIZE_16, 0x0105);
}
de_pop_sequence(attribute, avrcProfile);
}
de_pop_sequence(service, attribute);
// 0x000d "Additional Bluetooth Profile Descriptor List"
if (browsing){
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_ADDITIONAL_PROTOCOL_DESCRIPTOR_LISTS);
attribute = de_push_sequence(service);
{
uint8_t * des = de_push_sequence(attribute);
{
uint8_t* browsing_l2cpProtocol = de_push_sequence(des);
{
de_add_number(browsing_l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP);
de_add_number(browsing_l2cpProtocol, DE_UINT, DE_SIZE_16, PSM_AVCTP_BROWSING);
}
de_pop_sequence(des, browsing_l2cpProtocol);
uint8_t* browsing_avctpProtocol = de_push_sequence(des);
{
de_add_number(browsing_avctpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVCTP); // browsing_avctpProtocol_service
de_add_number(browsing_avctpProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version
}
de_pop_sequence(des, browsing_avctpProtocol);
}
de_pop_sequence(attribute, des);
}
de_pop_sequence(service, attribute);
}
// 0x0100 "Service Name"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100);
if (service_name){
de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name);
} else {
if (controller){
de_add_data(service, DE_STRING, strlen(default_avrcp_controller_service_name), (uint8_t *) default_avrcp_controller_service_name);
} else {
de_add_data(service, DE_STRING, strlen(default_avrcp_target_service_name), (uint8_t *) default_avrcp_target_service_name);
}
}
// 0x0100 "Provider Name"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102);
if (service_provider_name){
de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name);
} else {
if (controller){
de_add_data(service, DE_STRING, strlen(default_avrcp_controller_service_provider_name), (uint8_t *) default_avrcp_controller_service_provider_name);
} else {
de_add_data(service, DE_STRING, strlen(default_avrcp_target_service_provider_name), (uint8_t *) default_avrcp_target_service_provider_name);
}
}
// 0x0311 "Supported Features"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311);
de_add_number(service, DE_UINT, DE_SIZE_16, supported_features);
}
avrcp_connection_t * get_avrcp_connection_for_bd_addr(bd_addr_t addr, avrcp_context_t * context){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &context->connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (memcmp(addr, connection->remote_addr, 6) != 0) continue;
return connection;
}
return NULL;
}
avrcp_connection_t * get_avrcp_connection_for_l2cap_signaling_cid(uint16_t l2cap_cid, avrcp_context_t * context){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &context->connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->l2cap_signaling_cid != l2cap_cid) continue;
return connection;
}
return NULL;
}
avrcp_connection_t * get_avrcp_connection_for_avrcp_cid(uint16_t avrcp_cid, avrcp_context_t * context){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &context->connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->avrcp_cid != avrcp_cid) continue;
return connection;
}
return NULL;
}
void avrcp_request_can_send_now(avrcp_connection_t * connection, uint16_t l2cap_cid){
connection->wait_to_send = 1;
l2cap_request_can_send_now_event(l2cap_cid);
}
uint16_t avrcp_get_next_cid(void){
avrcp_cid_counter++;
if (avrcp_cid_counter == 0){
avrcp_cid_counter = 1;
}
return avrcp_cid_counter;
}
static avrcp_connection_t * avrcp_create_connection(bd_addr_t remote_addr, avrcp_context_t * context){
avrcp_connection_t * connection = btstack_memory_avrcp_connection_get();
if (!connection){
log_error("avrcp: not enough memory to create connection");
return NULL;
}
memset(connection, 0, sizeof(avrcp_connection_t));
connection->state = AVCTP_CONNECTION_IDLE;
connection->transaction_label = 0xFF;
connection->max_num_fragments = 0xFF;
connection->avrcp_cid = avrcp_get_next_cid();
memcpy(connection->remote_addr, remote_addr, 6);
btstack_linked_list_add(&context->connections, (btstack_linked_item_t *) connection);
return connection;
}
static void avrcp_finalize_connection(avrcp_connection_t * connection){
btstack_linked_list_remove(&sdp_query_context->connections, (btstack_linked_item_t*) connection);
btstack_memory_avrcp_connection_free(connection);
}
void avrcp_emit_connection_established(btstack_packet_handler_t callback, uint16_t avrcp_cid, bd_addr_t addr, uint8_t status){
if (!callback) return;
uint8_t event[12];
int pos = 0;
event[pos++] = HCI_EVENT_AVRCP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = AVRCP_SUBEVENT_CONNECTION_ESTABLISHED;
event[pos++] = status;
reverse_bd_addr(addr,&event[pos]);
pos += 6;
little_endian_store_16(event, pos, avrcp_cid);
pos += 2;
(*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
void avrcp_emit_connection_closed(btstack_packet_handler_t callback, uint16_t avrcp_cid){
if (!callback) return;
uint8_t event[5];
int pos = 0;
event[pos++] = HCI_EVENT_AVRCP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = AVRCP_SUBEVENT_CONNECTION_RELEASED;
little_endian_store_16(event, pos, avrcp_cid);
pos += 2;
(*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
void avrcp_handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
avrcp_connection_t * connection = get_avrcp_connection_for_avrcp_cid(sdp_query_context->avrcp_cid, sdp_query_context);
if (!connection) return;
if (connection->state != AVCTP_CONNECTION_W4_SDP_QUERY_COMPLETE) return;
UNUSED(packet_type);
UNUSED(channel);
UNUSED(size);
uint8_t status;
des_iterator_t des_list_it;
des_iterator_t prot_it;
// uint32_t avdtp_remote_uuid = 0;
switch (hci_event_packet_get_type(packet)){
case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
// Handle new SDP record
if (sdp_event_query_attribute_byte_get_record_id(packet) != sdp_query_context->record_id) {
sdp_query_context->record_id = sdp_event_query_attribute_byte_get_record_id(packet);
sdp_query_context->parse_sdp_record = 0;
// log_info("SDP Record: Nr: %d", record_id);
}
if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) {
attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet);
if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) {
switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) {
case BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST:
if (de_get_element_type(attribute_value) != DE_DES) break;
for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t * element = des_iterator_get_element(&des_list_it);
if (de_get_element_type(element) != DE_UUID) continue;
uint32_t uuid = de_get_uuid32(element);
switch (uuid){
case BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_TARGET:
if (sdp_query_context->role == AVRCP_CONTROLLER) {
sdp_query_context->parse_sdp_record = 1;
break;
}
break;
case BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL:
case BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_CONTROLLER:
if (sdp_query_context->role == AVRCP_TARGET) {
sdp_query_context->parse_sdp_record = 1;
break;
}
break;
default:
break;
}
}
break;
case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: {
if (!sdp_query_context->parse_sdp_record) break;
// log_info("SDP Attribute: 0x%04x", sdp_event_query_attribute_byte_get_attribute_id(packet));
for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t *des_element;
uint8_t *element;
uint32_t uuid;
if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
des_element = des_iterator_get_element(&des_list_it);
des_iterator_init(&prot_it, des_element);
element = des_iterator_get_element(&prot_it);
if (de_get_element_type(element) != DE_UUID) continue;
uuid = de_get_uuid32(element);
des_iterator_next(&prot_it);
switch (uuid){
case BLUETOOTH_PROTOCOL_L2CAP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &sdp_query_context->avrcp_l2cap_psm);
break;
case BLUETOOTH_PROTOCOL_AVCTP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &sdp_query_context->avrcp_version);
break;
default:
break;
}
}
}
break;
case BLUETOOTH_ATTRIBUTE_ADDITIONAL_PROTOCOL_DESCRIPTOR_LISTS: {
// log_info("SDP Attribute: 0x%04x", sdp_event_query_attribute_byte_get_attribute_id(packet));
if (!sdp_query_context->parse_sdp_record) break;
if (de_get_element_type(attribute_value) != DE_DES) break;
des_iterator_t des_list_0_it;
uint8_t *element_0;
des_iterator_init(&des_list_0_it, attribute_value);
element_0 = des_iterator_get_element(&des_list_0_it);
for (des_iterator_init(&des_list_it, element_0); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t *des_element;
uint8_t *element;
uint32_t uuid;
if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
des_element = des_iterator_get_element(&des_list_it);
des_iterator_init(&prot_it, des_element);
element = des_iterator_get_element(&prot_it);
if (de_get_element_type(element) != DE_UUID) continue;
uuid = de_get_uuid32(element);
des_iterator_next(&prot_it);
switch (uuid){
case BLUETOOTH_PROTOCOL_L2CAP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->browsing_l2cap_psm);
break;
case BLUETOOTH_PROTOCOL_AVCTP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &connection->browsing_version);
break;
default:
break;
}
}
}
break;
default:
break;
}
}
} else {
log_error("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, sdp_event_query_attribute_byte_get_attribute_length(packet));
}
break;
case SDP_EVENT_QUERY_COMPLETE:{
status = sdp_event_query_complete_get_status(packet);
if (status != ERROR_CODE_SUCCESS){
log_info("AVRCP: SDP query failed with status 0x%02x.", status);
avrcp_emit_connection_established(sdp_query_context->avrcp_callback, connection->avrcp_cid, connection->remote_addr, status);
avrcp_finalize_connection(connection);
break;
}
if (!sdp_query_context->avrcp_l2cap_psm){
connection->state = AVCTP_CONNECTION_IDLE;
log_info("AVRCP: no suitable service found");
avrcp_emit_connection_established(sdp_query_context->avrcp_callback, connection->avrcp_cid, connection->remote_addr, SDP_SERVICE_NOT_FOUND);
avrcp_finalize_connection(connection);
break;
}
connection->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED;
l2cap_create_channel(sdp_query_context->packet_handler, connection->remote_addr, sdp_query_context->avrcp_l2cap_psm, l2cap_max_mtu(), NULL);
break;
}
}
}
void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size, avrcp_context_t * context){
UNUSED(channel);
UNUSED(size);
bd_addr_t event_addr;
uint16_t local_cid;
uint8_t status;
avrcp_connection_t * connection = NULL;
uint16_t psm;
if (packet_type != HCI_EVENT_PACKET) return;
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_DISCONNECTION_COMPLETE:
avrcp_emit_connection_closed(context->avrcp_callback, 0);
break;
case L2CAP_EVENT_INCOMING_CONNECTION:
l2cap_event_incoming_connection_get_address(packet, event_addr);
local_cid = l2cap_event_incoming_connection_get_local_cid(packet);
connection = avrcp_create_connection(event_addr, context);
if (!connection) {
log_error("Failed to alloc connection structure");
l2cap_decline_connection(local_cid);
break;
}
psm = l2cap_event_incoming_connection_get_psm(packet);
if (psm == PSM_AVCTP){
if (!connection->l2cap_signaling_cid){
connection->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED;
connection->l2cap_signaling_cid = local_cid;
log_info("L2CAP_EVENT_INCOMING_CONNECTION avrcp_cid 0x%02x, l2cap_signaling_cid 0x%02x", connection->avrcp_cid, connection->l2cap_signaling_cid);
l2cap_accept_connection(local_cid);
break;
}
}
log_info("L2CAP_EVENT_INCOMING_CONNECTION local_cid 0x%02x, psm 0x%2x, decline connection", local_cid, psm);
l2cap_decline_connection(local_cid);
break;
case L2CAP_EVENT_CHANNEL_OPENED:
l2cap_event_channel_opened_get_address(packet, event_addr);
status = l2cap_event_channel_opened_get_status(packet);
local_cid = l2cap_event_channel_opened_get_local_cid(packet);
connection = get_avrcp_connection_for_bd_addr(event_addr, context);
if (!connection){
// TODO: validate if this cannot happen. If not, drop disconnect call
log_error("AVRCP connection lookup failed");
l2cap_disconnect(local_cid, 0); // reason isn't used
break;
}
if (status != ERROR_CODE_SUCCESS){
log_info("L2CAP connection to connection %s failed. status code 0x%02x", bd_addr_to_str(event_addr), status);
avrcp_emit_connection_established(context->avrcp_callback, connection->avrcp_cid, event_addr, status);
avrcp_finalize_connection(connection);
break;
}
psm = l2cap_event_channel_opened_get_psm(packet);
if (psm == PSM_AVCTP){
connection->l2cap_signaling_cid = local_cid;
connection->l2cap_mtu = l2cap_event_channel_opened_get_remote_mtu(packet);
connection->song_length_ms = 0xFFFFFFFF;
connection->song_position_ms = 0xFFFFFFFF;
connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR;
log_info("L2CAP_EVENT_CHANNEL_OPENED avrcp_cid 0x%02x, l2cap_signaling_cid 0x%02x", connection->avrcp_cid, connection->l2cap_signaling_cid);
connection->state = AVCTP_CONNECTION_OPENED;
avrcp_emit_connection_established(context->avrcp_callback, connection->avrcp_cid, event_addr, ERROR_CODE_SUCCESS);
}
break;
case L2CAP_EVENT_CHANNEL_CLOSED:
// data: event (8), len(8), channel (16)
local_cid = l2cap_event_channel_closed_get_local_cid(packet);
connection = get_avrcp_connection_for_l2cap_signaling_cid(local_cid, context);
if (connection){
avrcp_emit_connection_closed(context->avrcp_callback, connection->avrcp_cid);
avrcp_finalize_connection(connection);
break;
}
break;
default:
break;
}
}
uint8_t avrcp_connect(bd_addr_t bd_addr, avrcp_context_t * context, uint16_t * avrcp_cid){
avrcp_connection_t * connection = get_avrcp_connection_for_bd_addr(bd_addr, context);
if (connection){
return ERROR_CODE_COMMAND_DISALLOWED;
}
connection = avrcp_create_connection(bd_addr, context);
if (!connection){
log_error("avrcp: could not allocate connection struct.");
return BTSTACK_MEMORY_ALLOC_FAILED;
}
if (avrcp_cid){
*avrcp_cid = connection->avrcp_cid;
}
connection->state = AVCTP_CONNECTION_W4_SDP_QUERY_COMPLETE;
context->avrcp_l2cap_psm = 0;
context->avrcp_version = 0;
context->avrcp_cid = connection->avrcp_cid;
connection->browsing_l2cap_psm = 0;
sdp_query_context = context;
uint8_t status = sdp_client_query_uuid16(&avrcp_handle_sdp_client_query_result, bd_addr, BLUETOOTH_PROTOCOL_AVCTP);
// free connection struct in case of SDP connection error
if (status){
log_info("AVRCP: SDP query failed with status 0x%02x.", status);
avrcp_finalize_connection(connection);
}
return status;
}
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