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btstack/test/avdtp/avdtp_sink.c
Milanka Ringwald 55863429e4 avdtp add second state machine for remote site
2016-10-05 15:55:30 +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
*
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "btstack.h"
#include "avdtp.h"
#include "avdtp_sink.h"
#include "btstack_sbc.h"
#include "wav_util.h"
#define OI_DEBUG
#define STORE_SBC_TO_SBC_FILE
static const char * default_avdtp_sink_service_name = "BTstack AVDTP Sink Service";
static const char * default_avdtp_sink_service_provider_name = "BTstack AVDTP Sink Service Provider";
static btstack_linked_list_t avdtp_sink_connections = NULL;
static avdtp_sep_t local_seps[MAX_NUM_SEPS];
static uint8_t local_seps_num = 0;
static btstack_packet_handler_t avdtp_sink_callback;
static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void avdtp_sink_run_for_connection(avdtp_sink_connection_t *connection);
#ifdef STORE_SBC_TO_WAV_FILE
// store sbc as wav:
static btstack_sbc_decoder_state_t state;
static int total_num_samples = 0;
static int frame_count = 0;
static char * wav_filename = "avdtp_sink.wav";
static btstack_sbc_mode_t mode = SBC_MODE_STANDARD;
static void handle_pcm_data(int16_t * data, int num_samples, int num_channels, int sample_rate, void * context){
wav_writer_write_int16(num_samples, data);
total_num_samples+=num_samples;
frame_count++;
}
#endif
#ifdef STORE_SBC_TO_SBC_FILE
static FILE * sbc_file;
static char * sbc_filename = "avdtp_sink.sbc";
#endif
void a2dp_sink_create_sdp_record(uint8_t * service, uint32_t service_record_handle, 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, SDP_ServiceRecordHandle);
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, SDP_ServiceClassIDList);
attribute = de_push_sequence(service);
{
de_add_number(attribute, DE_UUID, DE_SIZE_16, AUDIO_SINK_GROUP);
}
de_pop_sequence(service, attribute);
// 0x0004 "Protocol Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ProtocolDescriptorList);
attribute = de_push_sequence(service);
{
uint8_t* l2cpProtocol = de_push_sequence(attribute);
{
de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, SDP_L2CAPProtocol);
de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, PSM_AVDTP);
}
de_pop_sequence(attribute, l2cpProtocol);
uint8_t* avProtocol = de_push_sequence(attribute);
{
de_add_number(avProtocol, DE_UUID, DE_SIZE_16, PSM_AVDTP); // avProtocol_service
de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version
}
de_pop_sequence(attribute, avProtocol);
}
de_pop_sequence(service, attribute);
// 0x0005 "Public Browse Group"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_BrowseGroupList); // public browse group
attribute = de_push_sequence(service);
{
de_add_number(attribute, DE_UUID, DE_SIZE_16, SDP_PublicBrowseGroup);
}
de_pop_sequence(service, attribute);
// 0x0009 "Bluetooth Profile Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_BluetoothProfileDescriptorList);
attribute = de_push_sequence(service);
{
uint8_t *a2dProfile = de_push_sequence(attribute);
{
de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, ADVANCED_AUDIO_DISTRIBUTION);
de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103);
}
de_pop_sequence(attribute, a2dProfile);
}
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 {
de_add_data(service, DE_STRING, strlen(default_avdtp_sink_service_name), (uint8_t *) default_avdtp_sink_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 {
de_add_data(service, DE_STRING, strlen(default_avdtp_sink_service_provider_name), (uint8_t *) default_avdtp_sink_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);
}
uint8_t avdtp_sink_register_stream_end_point(avdtp_sep_type_t sep_type, avdtp_media_type_t media_type){
if (local_seps_num >= MAX_NUM_SEPS){
log_error("avdtp_sink_register_sep: excedeed max sep number %d", MAX_NUM_SEPS);
return 255;
}
uint8_t seid = local_seps_num;
avdtp_sep_t entry = {
seid,
0,
media_type,
sep_type
};
local_seps[local_seps_num] = entry;
local_seps_num++;
return seid;
}
static int get_bit16(uint16_t bitmap, int position){
return (bitmap >> position) & 1;
}
static uint8_t store_bit16(uint16_t bitmap, int position, uint8_t value){
if (value){
bitmap |= 1 << position;
} else {
bitmap &= ~ (1 << position);
}
return bitmap;
}
void avdtp_sink_register_media_transport_category(uint8_t seid){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_MEDIA_TRANSPORT, 1);
local_seps[seid].registered_service_categories = bitmap;
printf("registered services AVDTP_MEDIA_TRANSPORT(%d) %02x\n", AVDTP_MEDIA_TRANSPORT, local_seps[seid].registered_service_categories);
}
void avdtp_sink_register_reporting_category(uint8_t seid){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_REPORTING, 1);
local_seps[seid].registered_service_categories = bitmap;
}
void avdtp_sink_register_delay_reporting_category(uint8_t seid){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_DELAY_REPORTING, 1);
local_seps[seid].registered_service_categories = bitmap;
}
void avdtp_sink_register_recovery_category(uint8_t seid, uint8_t maximum_recovery_window_size, uint8_t maximum_number_media_packets){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_RECOVERY, 1);
local_seps[seid].registered_service_categories = bitmap;
local_seps[seid].capabilities.recovery.recovery_type = 0x01; // 0x01 = RFC2733
local_seps[seid].capabilities.recovery.maximum_recovery_window_size = maximum_recovery_window_size;
local_seps[seid].capabilities.recovery.maximum_number_media_packets = maximum_number_media_packets;
}
void avdtp_sink_register_content_protection_category(uint8_t seid, uint8_t cp_type_lsb, uint8_t cp_type_msb, const uint8_t * cp_type_value, uint8_t cp_type_value_len){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_CONTENT_PROTECTION, 1);
local_seps[seid].registered_service_categories = bitmap;
local_seps[seid].capabilities.content_protection.cp_type_lsb = cp_type_lsb;
local_seps[seid].capabilities.content_protection.cp_type_msb = cp_type_msb;
local_seps[seid].capabilities.content_protection.cp_type_value = cp_type_value;
local_seps[seid].capabilities.content_protection.cp_type_value_len = cp_type_value_len;
}
void avdtp_sink_register_header_compression_category(uint8_t seid, uint8_t back_ch, uint8_t media, uint8_t recovery){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_HEADER_COMPRESSION, 1);
local_seps[seid].registered_service_categories = bitmap;
local_seps[seid].capabilities.header_compression.back_ch = back_ch;
local_seps[seid].capabilities.header_compression.media = media;
local_seps[seid].capabilities.header_compression.recovery = recovery;
}
void avdtp_sink_register_media_codec_category(uint8_t seid, avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, const uint8_t * media_codec_info, uint16_t media_codec_info_len){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_MEDIA_CODEC, 1);
local_seps[seid].registered_service_categories = bitmap;
printf("registered services AVDTP_MEDIA_CODEC(%d) %02x\n", AVDTP_MEDIA_CODEC, local_seps[seid].registered_service_categories);
local_seps[seid].capabilities.media_codec.media_type = media_type;
local_seps[seid].capabilities.media_codec.media_codec_type = media_codec_type;
local_seps[seid].capabilities.media_codec.media_codec_information = media_codec_info;
local_seps[seid].capabilities.media_codec.media_codec_information_len = media_codec_info_len;
}
void avdtp_sink_register_multiplexing_category(uint8_t seid, uint8_t fragmentation){
if (seid >= local_seps_num){
log_error("invalid stream end point identifier");
return;
}
uint16_t bitmap = store_bit16(local_seps[seid].registered_service_categories, AVDTP_MULTIPLEXING, 1);
local_seps[seid].registered_service_categories = bitmap;
local_seps[seid].capabilities.multiplexing_mode.fragmentation = fragmentation;
}
// // media, reporting. recovery
// void avdtp_sink_register_media_transport_identifier_for_multiplexing_category(uint8_t seid, uint8_t fragmentation){
// }
static void audio_sink_generate_next_transaction_label(avdtp_sink_connection_t * connection){
connection->local_transaction_label++;
}
static avdtp_sink_connection_t * create_avdtp_sink_connection_context(bd_addr_t bd_addr){
avdtp_sink_connection_t * avdtp_connection = btstack_memory_avdtp_sink_connection_get();
if (!avdtp_connection) return NULL;
memset(avdtp_connection,0, sizeof(avdtp_sink_connection_t));
memcpy(avdtp_connection->remote_addr, bd_addr, 6);
avdtp_connection->local_state = AVDTP_SINK_IDLE;
btstack_linked_list_add(&avdtp_sink_connections, (btstack_linked_item_t*)avdtp_connection);
return avdtp_connection;
}
static avdtp_sink_connection_t * get_avdtp_sink_connection_context_for_bd_addr(bd_addr_t bd_addr){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &avdtp_sink_connections);
while (btstack_linked_list_iterator_has_next(&it)){
avdtp_sink_connection_t * connection = (avdtp_sink_connection_t *)btstack_linked_list_iterator_next(&it);
if (memcmp(connection->remote_addr, bd_addr, 6) == 0) {
return connection;
}
}
return NULL;
}
static avdtp_sink_connection_t * get_avdtp_sink_connection_context_for_l2cap_cid(uint16_t l2cap_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &avdtp_sink_connections);
while (btstack_linked_list_iterator_has_next(&it)){
avdtp_sink_connection_t * connection = (avdtp_sink_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->l2cap_signaling_cid == l2cap_cid){
return connection;
}
if (connection->l2cap_media_cid == l2cap_cid){
return connection;
}
if (connection->l2cap_reporting_cid == l2cap_cid){
return connection;
}
}
return NULL;
}
static void avdtp_sink_remove_connection_context(avdtp_sink_connection_t * connection){
btstack_linked_list_remove(&avdtp_sink_connections, (btstack_linked_item_t*) connection);
}
static inline uint8_t avdtp_header(uint8_t tr_label, avdtp_packet_type_t packet_type, avdtp_message_type_t msg_type){
return (tr_label<<4) | ((uint8_t)packet_type<<2) | (uint8_t)msg_type;
}
static int avdtp_sink_send_signaling_cmd(uint16_t cid, avdtp_signal_identifier_t identifier, uint8_t transaction_label){
uint8_t command[2];
command[0] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_CMD_MSG);
command[1] = (uint8_t)identifier;
return l2cap_send(cid, command, sizeof(command));
}
static int avdtp_sink_send_seps_response(uint16_t cid, uint8_t transaction_label, avdtp_sep_t * seps, int seps_num){
uint8_t command[2+2*MAX_NUM_SEPS];
int pos = 0;
command[pos++] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_RESPONSE_ACCEPT_MSG);
command[pos++] = (uint8_t)AVDTP_DISCOVER;
int i = 0;
for (i=0; i<seps_num; i++){
command[pos++] = (seps[i].seid << 2) | (seps[i].in_use<<1);
command[pos++] = (seps[i].media_type << 4) | (seps[i].type << 3);
}
return l2cap_send(cid, command, pos);
}
static int avdtp_sink_send_accept_response(uint16_t cid, avdtp_signal_identifier_t identifier, uint8_t transaction_label){
uint8_t command[2];
command[0] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_RESPONSE_ACCEPT_MSG);
command[1] = (uint8_t)identifier;
return l2cap_send(cid, command, sizeof(command));
}
// static int avdtp_sink_send_configuration_reject_response(uint16_t cid, uint8_t transaction_label){
// uint8_t command[3];
// command[0] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_RESPONSE_REJECT_MSG);
// command[1] = (uint8_t)AVDTP_SET_CONFIGURATION;
// command[2] = 0x00;
// // TODO: add reason for reject AVDTP 8.9
// return l2cap_send(cid, command, sizeof(command));
// }
static int avdtp_sink_send_get_capabilities_cmd(uint16_t cid, uint8_t sep_id){
return 0;
}
static int avdtp_pack_service_capabilities(uint8_t * buffer, int size, avdtp_capabilities_t caps, avdtp_service_category_t category){
int i;
// pos = 0 reserved for length
int pos = 1;
switch(category){
case AVDTP_MEDIA_TRANSPORT:
case AVDTP_REPORTING:
case AVDTP_DELAY_REPORTING:
break;
case AVDTP_RECOVERY:
buffer[pos++] = caps.recovery.recovery_type; // 0x01=RFC2733
buffer[pos++] = caps.recovery.maximum_recovery_window_size;
buffer[pos++] = caps.recovery.maximum_number_media_packets;
break;
case AVDTP_CONTENT_PROTECTION:
buffer[pos++] = caps.content_protection.cp_type_lsb;
buffer[pos++] = caps.content_protection.cp_type_msb;
for (i = 0; i<caps.content_protection.cp_type_value_len; i++){
buffer[pos++] = caps.content_protection.cp_type_value[i];
}
break;
case AVDTP_HEADER_COMPRESSION:
buffer[pos++] = (caps.header_compression.back_ch << 7) | (caps.header_compression.media << 6) | (caps.header_compression.recovery << 5);
break;
case AVDTP_MULTIPLEXING:
buffer[pos++] = caps.multiplexing_mode.fragmentation << 7;
for (i=0; i<caps.multiplexing_mode.transport_identifiers_num; i++){
buffer[pos++] = caps.multiplexing_mode.transport_session_identifiers[i] << 7;
buffer[pos++] = caps.multiplexing_mode.tcid[i] << 7;
// media, reporting. recovery
}
break;
case AVDTP_MEDIA_CODEC:
buffer[pos++] = ((uint8_t)caps.media_codec.media_type) << 4;
buffer[pos++] = (uint8_t)caps.media_codec.media_codec_type;
for (i = 0; i<caps.media_codec.media_codec_information_len; i++){
buffer[pos++] = caps.media_codec.media_codec_information[i];
}
break;
}
buffer[0] = pos; // length
return pos;
}
static uint16_t avdtp_unpack_service_capabilities(avdtp_capabilities_t * caps, uint8_t * packet, uint16_t size){
int pos = 0;
uint16_t registered_service_categories = 0;
avdtp_service_category_t category = (avdtp_service_category_t)packet[pos++];
uint8_t cap_len = packet[pos++];
int i;
while (pos < size){
switch(category){
case AVDTP_MEDIA_TRANSPORT:
case AVDTP_REPORTING:
case AVDTP_DELAY_REPORTING:
pos++;
break;
case AVDTP_RECOVERY:
caps->recovery.recovery_type = packet[pos++];
caps->recovery.maximum_recovery_window_size = packet[pos++];
caps->recovery.maximum_number_media_packets = packet[pos++];
break;
case AVDTP_CONTENT_PROTECTION:
caps->content_protection.cp_type_lsb = packet[pos++];
caps->content_protection.cp_type_msb = packet[pos++];
caps->content_protection.cp_type_value_len = cap_len - 2;
printf_hexdump(packet+pos, caps->content_protection.cp_type_value_len);
pos += caps->content_protection.cp_type_value_len;
break;
case AVDTP_HEADER_COMPRESSION:
caps->header_compression.back_ch = packet[pos] >> 7;
caps->header_compression.media = packet[pos] >> 6;
caps->header_compression.recovery = packet[pos] >> 5;
pos++;
break;
case AVDTP_MULTIPLEXING:
caps->multiplexing_mode.fragmentation = packet[pos++] >> 7;
for (i=0; i<caps->multiplexing_mode.transport_identifiers_num; i++){
caps->multiplexing_mode.transport_session_identifiers[i] = packet[pos++] >> 7;
caps->multiplexing_mode.tcid[i] = packet[pos++] >> 7;
// media, reporting. recovery
}
break;
case AVDTP_MEDIA_CODEC:
caps->media_codec.media_type = packet[pos++] >> 4;
caps->media_codec.media_codec_type = packet[pos++];
caps->media_codec.media_codec_information_len = cap_len - 2;
printf_hexdump(packet+pos, caps->media_codec.media_codec_information_len);
pos += caps->media_codec.media_codec_information_len;
break;
}
registered_service_categories = store_bit16(registered_service_categories, category, 1);
}
return registered_service_categories;
}
static int avdtp_sink_send_capabilities_response(uint16_t cid, uint8_t transaction_label, avdtp_sep_t sep){
uint8_t command[100];
int pos = 0;
command[pos++] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_RESPONSE_ACCEPT_MSG);
command[pos++] = (uint8_t)AVDTP_GET_CAPABILITIES;
int i = 0;
for (i = 1; i < 9; i++){
if (get_bit16(sep.registered_service_categories, i)){
// service category
command[pos++] = i;
pos += avdtp_pack_service_capabilities(command+pos, sizeof(command)-pos, sep.capabilities, (avdtp_service_category_t)i);
}
}
return l2cap_send(cid, command, pos);
}
static void handle_l2cap_media_data_packet(avdtp_sink_connection_t * connection, uint8_t *packet, uint16_t size){
int pos = 0;
avdtp_media_packet_header_t media_header;
media_header.version = packet[pos] & 0x03;
media_header.padding = get_bit16(packet[pos],2);
media_header.extension = get_bit16(packet[pos],3);
media_header.csrc_count = (packet[pos] >> 4) & 0x0F;
pos++;
media_header.marker = get_bit16(packet[pos],0);
media_header.payload_type = (packet[pos] >> 1) & 0x7F;
pos++;
media_header.sequence_number = big_endian_read_16(packet, pos);
pos+=2;
media_header.timestamp = big_endian_read_32(packet, pos);
pos+=4;
media_header.synchronization_source = big_endian_read_32(packet, pos);
pos+=4;
// TODO: read csrc list
printf_hexdump( packet, pos );
printf("MEDIA HEADER: %u timestamp, version %u, padding %u, extension %u, csrc_count %u\n",
media_header.timestamp, media_header.version, media_header.padding, media_header.extension, media_header.csrc_count);
printf("MEDIA HEADER: marker %02x, payload_type %02x, sequence_number %u, synchronization_source %u\n",
media_header.marker, media_header.payload_type, media_header.sequence_number, media_header.synchronization_source);
avdtp_sbc_codec_header_t sbc_header;
sbc_header.fragmentation = get_bit16(packet[pos], 7);
sbc_header.starting_packet = get_bit16(packet[pos], 6);
sbc_header.last_packet = get_bit16(packet[pos], 5);
sbc_header.num_frames = packet[pos] & 0x0f;
pos++;
printf("SBC HEADER: num_frames %u, fragmented %u, start %u, stop %u\n", sbc_header.num_frames, sbc_header.fragmentation, sbc_header.starting_packet, sbc_header.last_packet);
printf_hexdump( packet+pos, size-pos );
#ifdef STORE_SBC_TO_WAV_FILE
btstack_sbc_decoder_process_data(&state, 0, packet+pos, size-pos);
#endif
#ifdef STORE_SBC_TO_SBC_FILE
fwrite(packet+pos, size-pos, 1, sbc_file);
#endif
}
static void handle_l2cap_signaling_data_packet(avdtp_sink_connection_t * connection, uint8_t *packet, uint16_t size){
if (size < 2) {
log_error("l2cap data packet too small");
return;
}
avdtp_signaling_packet_header_t signaling_header;
signaling_header.transaction_label = packet[0] >> 4;
signaling_header.packet_type = (avdtp_packet_type_t)((packet[0] >> 2) & 0x03);
signaling_header.message_type = (avdtp_message_type_t) (packet[0] & 0x03);
signaling_header.signal_identifier = packet[1] & 0x3f;
printf("SIGNALING HEADER: tr_label %d, packet_type %d, msg_type %d, signal_identifier %02x\n",
signaling_header.transaction_label, signaling_header.packet_type, signaling_header.message_type, signaling_header.signal_identifier);
int i = 2;
avdtp_sep_t sep;
if (signaling_header.message_type == AVDTP_CMD_MSG){
// remote
printf("command from remote: ");
connection->remote_transaction_label = signaling_header.transaction_label;
switch (signaling_header.signal_identifier){
case AVDTP_DISCOVER:
if (connection->remote_state != AVDTP_REMOTE_IDLE) return;
printf("AVDTP_DISCOVER\n");
connection->remote_state = AVDTP_REMOTE_W2_ANSWER_DISCOVER_SEPS;
l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
break;
case AVDTP_GET_CAPABILITIES:
if (connection->remote_state != AVDTP_REMOTE_IDLE) return;
printf("AVDTP_GET_CAPABILITIES\n");
connection->local_seid = packet[2] >> 2;
connection->remote_state = AVDTP_REMOTE_W2_ANSWER_GET_CAPABILITIES;
l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
break;
case AVDTP_SET_CONFIGURATION:
if (connection->remote_state != AVDTP_REMOTE_IDLE) return;
printf("AVDTP_SET_CONFIGURATION\n");
connection->local_seid = packet[2] >> 2;
sep.seid = packet[3] >> 2;
// find or add sep
for (i=0; i<connection->remote_seps_num; i++){
if (connection->remote_seps[i].seid == sep.seid){
connection->remote_sep_index = i;
}
}
sep.registered_service_categories = avdtp_unpack_service_capabilities(&sep.capabilities, packet+4, size-4);
connection->remote_seps[connection->remote_sep_index] = sep;
connection->remote_state = AVDTP_REMOTE_W2_ANSWER_SET_CONFIGURATION;
l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
break;
case AVDTP_OPEN:
if (connection->remote_state != AVDTP_REMOTE_IDLE) return;
printf("AVDTP_OPEN\n");
connection->local_seid = packet[2] >> 2;
connection->remote_state = AVDTP_REMOTE_W2_ANSWER_OPEN_STREAM;
l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
break;
case AVDTP_START:
if (connection->remote_state != AVDTP_REMOTE_OPEN) return;
printf("AVDTP_START\n");
connection->local_seid = packet[2] >> 2;
connection->remote_state = AVDTP_REMOTE_W2_ANSWER_START_SINGLE_STREAM;
l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
break;
default:
printf("NOT IMPLEMENTED signal_identifier %d\n", signaling_header.signal_identifier);
printf_hexdump( packet, size );
break;
}
return;
}
printf("send to remote: ");
switch (connection->local_state){
case AVDTP_SINK_W4_SEPS_DISCOVERED:
printf("AVDTP_SINK_W4_SEPS_DISCOVERED\n");
if (signaling_header.transaction_label != connection->local_transaction_label){
log_error("unexpected transaction label, got %d, expected %d", signaling_header.transaction_label, connection->local_transaction_label);
return;
}
if (signaling_header.signal_identifier != AVDTP_DISCOVER) {
log_error("unexpected signal identifier ...");
return;
}
if (signaling_header.message_type != AVDTP_RESPONSE_ACCEPT_MSG){
log_error("request rejected...");
return;
}
if (size == 3){
printf("ERROR code %02x\n", packet[2]);
return;
}
for (i = 2; i<size; i+=2){
sep.seid = packet[i] >> 2;
if (sep.seid < 0x01 || sep.seid > 0x3E){
log_error("invalid sep id");
return;
}
sep.in_use = (packet[i] >> 1) & 0x01;
sep.media_type = (avdtp_media_type_t)(packet[i+1] >> 4);
sep.type = (avdtp_sep_type_t)((packet[i+1] >> 3) & 0x01);
connection->remote_seps[connection->remote_seps_num++] = sep;
printf("found sep: seid %u, in_use %d, media type %d, sep type %d (1-SNK)\n",
sep.seid, sep.in_use, sep.media_type, sep.type);
}
// connection->local_state = AVDTP_SINK_W2_GET_CAPABILITIES;
// connection->local_transaction_label++;
// l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
break;
default:
printf("NOT IMPLEMENTED\n");
printf_hexdump( packet, size );
break;
}
}
static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
bd_addr_t event_addr;
hci_con_handle_t con_handle;
uint16_t psm;
uint16_t remote_cid;
uint16_t local_cid;
avdtp_sink_connection_t * connection = NULL;
switch (packet_type) {
case L2CAP_DATA_PACKET:
connection = get_avdtp_sink_connection_context_for_l2cap_cid(channel);
if (!connection){
log_error("avdtp packet handler L2CAP_DATA_PACKET: connection for local cid 0x%02x not found", channel);
break;
}
if (channel == connection->l2cap_signaling_cid){
handle_l2cap_signaling_data_packet(connection, packet, size);
} else if (channel == connection->l2cap_media_cid){
handle_l2cap_media_data_packet(connection, packet, size);
} else if (channel == connection->l2cap_reporting_cid){
// TODO
} else {
log_error("avdtp packet handler L2CAP_DATA_PACKET: local cid 0x%02x not found", channel);
}
break;
case HCI_EVENT_PACKET:
switch (hci_event_packet_get_type(packet)) {
case L2CAP_EVENT_INCOMING_CONNECTION:
l2cap_event_incoming_connection_get_address(packet, event_addr);
connection = get_avdtp_sink_connection_context_for_bd_addr(event_addr);
if (!connection){
log_error("avdtp packet handler L2CAP_EVENT_INCOMING_CONNECTION: connection for bd address %s not found", bd_addr_to_str(event_addr));
break;
}
connection = create_avdtp_sink_connection_context(event_addr);
if (!connection) return;
con_handle = l2cap_event_incoming_connection_get_handle(packet);
psm = l2cap_event_incoming_connection_get_psm(packet);
local_cid = l2cap_event_incoming_connection_get_local_cid(packet);
remote_cid = l2cap_event_incoming_connection_get_remote_cid(packet);
printf("L2CAP_EVENT_INCOMING_CONNECTION %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x\n",
bd_addr_to_str(event_addr), con_handle, psm, local_cid, remote_cid);
l2cap_accept_connection(local_cid);
break;
case L2CAP_EVENT_CHANNEL_OPENED:
// inform about new l2cap connection
l2cap_event_channel_opened_get_address(packet, event_addr);
connection = get_avdtp_sink_connection_context_for_bd_addr(event_addr);
if (!connection){
log_error("avdtp sink: L2CAP_EVENT_CHANNEL_OPENED: connection for bd addr %s cannot be found", bd_addr_to_str(event_addr));
return;
}
if (l2cap_event_channel_opened_get_status(packet)){
printf("L2CAP connection to device %s failed. status code 0x%02x\n",
bd_addr_to_str(event_addr), l2cap_event_channel_opened_get_status(packet));
break;
}
psm = l2cap_event_channel_opened_get_psm(packet);
if (psm != PSM_AVDTP){
log_error("unexpected PSM - Not implemented yet, avdtp sink: L2CAP_EVENT_CHANNEL_OPENED");
return;
}
printf("L2CAP_EVENT_CHANNEL_OPENED cid %02x, context %p, local state %d, remote state %d\n",
l2cap_event_channel_opened_get_local_cid(packet), connection, connection->local_state, connection->remote_state);
if (connection->local_state == AVDTP_SINK_W4_L2CAP_CONNECTED){
connection->l2cap_signaling_cid = l2cap_event_channel_opened_get_local_cid(packet);
connection->local_state = AVDTP_SINK_W2_DISCOVER_SEPS;
audio_sink_generate_next_transaction_label(connection);
l2cap_request_can_send_now_event(connection->l2cap_signaling_cid);
printf("L2CAP_EVENT_CHANNEL_OPENED: Signaling ");
} else if (connection->remote_state <= AVDTP_REMOTE_W4_STREAMING_CONNECTION_OPEN){
connection->l2cap_media_cid = l2cap_event_channel_opened_get_local_cid(packet);
connection->remote_state = AVDTP_REMOTE_STREAMING;
// l2cap_request_can_send_now_event(connection->l2cap_media_cid);
printf("L2CAP_EVENT_CHANNEL_OPENED: Media ");
} else {
printf("unexpected connection state: Not implemented yet remote state %d\n", connection->remote_state);
return;
}
con_handle = l2cap_event_channel_opened_get_handle(packet);
printf("Channel successfully opened: %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x, context %p\n",
bd_addr_to_str(event_addr), con_handle, psm, connection->l2cap_signaling_cid, l2cap_event_channel_opened_get_remote_cid(packet),
connection);
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_avdtp_sink_connection_context_for_l2cap_cid(local_cid);
if (!connection || connection->local_state != AVDTP_SINK_W4_L2CAP_DISCONNECTED) return;
log_info("L2CAP_EVENT_CHANNEL_CLOSED cid 0x%0x", local_cid);
avdtp_sink_remove_connection_context(connection);
connection->local_state = AVDTP_SINK_IDLE;
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:{
#ifdef STORE_SBC_TO_WAV_FILE
wav_writer_close();
int total_frames_nr = state.good_frames_nr + state.bad_frames_nr + state.zero_frames_nr;
printf("\nDecoding done. Processed totaly %d frames:\n - %d good\n - %d bad\n - %d zero frames\n", total_frames_nr, state.good_frames_nr, state.bad_frames_nr, state.zero_frames_nr);
printf("Write %d frames to wav file: %s\n\n", frame_count, wav_filename);
#endif
#ifdef STORE_SBC_TO_SBC_FILE
fclose(sbc_file);
#endif
}
default:
// other event
break;
}
break;
default:
// other packet type
break;
}
avdtp_sink_run_for_connection(connection);
}
// TODO: find out which security level is needed, and replace LEVEL_0 in avdtp_sink_init
void avdtp_sink_init(void){
#ifdef STORE_SBC_TO_WAV_FILE
btstack_sbc_decoder_init(&state, mode, &handle_pcm_data, NULL);
wav_writer_open(wav_filename, 2, 44100);
#endif
#ifdef STORE_SBC_TO_SBC_FILE
sbc_file = fopen(sbc_filename, "wb");
#endif
l2cap_register_service(&packet_handler, PSM_AVDTP, 0xffff, LEVEL_0);
}
void avdtp_sink_register_packet_handler(btstack_packet_handler_t callback){
if (callback == NULL){
log_error("avdtp_sink_register_packet_handler called with NULL callback");
return;
}
avdtp_sink_callback = callback;
}
static void avdtp_sink_run_for_connection(avdtp_sink_connection_t *connection){
if (!connection) return;
if (connection->release_l2cap_connection){
if (connection->local_state > AVDTP_SINK_W4_L2CAP_CONNECTED ||
connection->local_state < AVDTP_SINK_W4_L2CAP_DISCONNECTED){
connection->release_l2cap_connection = 0;
connection->local_state = AVDTP_SINK_W4_L2CAP_DISCONNECTED;
l2cap_disconnect(connection->l2cap_signaling_cid, 0);
return;
}
}
if (!l2cap_can_send_packet_now(connection->l2cap_signaling_cid)) {
log_info("avdtp_sink_run_for_connection: request cannot send for 0x%02x", connection->l2cap_signaling_cid);
return;
}
printf("avdtp_sink_run_for_connection: \n");
int sent = 1;
switch (connection->remote_state){
case AVDTP_REMOTE_W2_ANSWER_DISCOVER_SEPS:
connection->remote_state = AVDTP_REMOTE_IDLE;
avdtp_sink_send_seps_response(connection->l2cap_signaling_cid, connection->remote_transaction_label, local_seps, local_seps_num);
break;
case AVDTP_REMOTE_W2_ANSWER_GET_CAPABILITIES:
connection->remote_state = AVDTP_REMOTE_IDLE;
avdtp_sink_send_capabilities_response(connection->l2cap_signaling_cid, connection->remote_transaction_label, local_seps[connection->local_seid]);
break;
case AVDTP_REMOTE_W2_ANSWER_SET_CONFIGURATION:
connection->remote_state = AVDTP_REMOTE_IDLE;
avdtp_sink_send_accept_response(connection->l2cap_signaling_cid, AVDTP_SET_CONFIGURATION, connection->remote_transaction_label);
break;
case AVDTP_REMOTE_W2_ANSWER_OPEN_STREAM:
connection->remote_state = AVDTP_REMOTE_OPEN;
avdtp_sink_send_accept_response(connection->l2cap_signaling_cid, AVDTP_OPEN, connection->remote_transaction_label);
break;
case AVDTP_REMOTE_W2_ANSWER_START_SINGLE_STREAM:
connection->remote_state = AVDTP_REMOTE_W4_STREAMING_CONNECTION_OPEN;
avdtp_sink_send_accept_response(connection->l2cap_signaling_cid, AVDTP_START, connection->remote_transaction_label);
break;
default:
sent = 0;
break;
}
if (sent == 1){
printf("answered to remote\n");
return;
}
sent = 1;
switch (connection->local_state){
case AVDTP_SINK_W2_DISCOVER_SEPS:
connection->local_state = AVDTP_SINK_W4_SEPS_DISCOVERED;
avdtp_sink_send_signaling_cmd(connection->l2cap_signaling_cid, AVDTP_DISCOVER, connection->local_transaction_label);
break;
case AVDTP_SINK_W2_GET_CAPABILITIES:
connection->local_state = AVDTP_SINK_W4_CAPABILITIES;
avdtp_sink_send_get_capabilities_cmd(connection->l2cap_signaling_cid, 0);
break;
default:
sent = 0;
break;
}
if (sent){
printf("sent request to remote\n");
return;
}
}
void avdtp_sink_connect(bd_addr_t bd_addr){
avdtp_sink_connection_t * connection = get_avdtp_sink_connection_context_for_bd_addr(bd_addr);
if (connection) {
log_error("avdtp_sink_connect: connection for bd address %s not found", bd_addr_to_str(bd_addr));
return;
}
connection = create_avdtp_sink_connection_context(bd_addr);
if (!connection){
log_error("avdtp_sink_connect: cannot create connection for bd address %s", bd_addr_to_str(bd_addr));
return;
}
connection->local_state = AVDTP_SINK_W4_L2CAP_CONNECTED;
l2cap_create_channel(packet_handler, connection->remote_addr, PSM_AVDTP, 0xffff, NULL);
}
void avdtp_sink_disconnect(uint16_t l2cap_cid){
avdtp_sink_connection_t * connection = get_avdtp_sink_connection_context_for_l2cap_cid(l2cap_cid);
if (!connection) {
log_error("avdtp_sink_disconnect: Connection with l2cap_cid %d not found", l2cap_cid);
return;
}
if (connection->local_state == AVDTP_SINK_IDLE) return;
if (connection->local_state == AVDTP_SINK_W4_L2CAP_DISCONNECTED) return;
connection->release_l2cap_connection = 1;
avdtp_sink_run_for_connection(connection);
}
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