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btstack/src/classic/a2dp_source.c

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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__ "a2dp_source.c"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#include "classic/avdtp.h"
#include "classic/avdtp_util.h"
#include "classic/avdtp_source.h"
#include "classic/a2dp_source.h"
#define AVDTP_MAX_SEP_NUM 10
#define AVDTP_MEDIA_PAYLOAD_HEADER_SIZE 12
static const char * default_a2dp_source_service_name = "BTstack A2DP Source Service";
static const char * default_a2dp_source_service_provider_name = "BTstack A2DP Source Service Provider";
static avdtp_context_t a2dp_source_context;
static a2dp_state_t app_state = A2DP_IDLE;
static avdtp_stream_endpoint_context_t sc;
static avdtp_sep_t remote_seps[AVDTP_MAX_SEP_NUM];
static int remote_seps_index = 0;
static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
void a2dp_source_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, 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);
{
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SOURCE);
}
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_AVDTP);
}
de_pop_sequence(attribute, l2cpProtocol);
uint8_t* avProtocol = de_push_sequence(attribute);
{
de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_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, 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 *a2dProfile = de_push_sequence(attribute);
{
de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_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_a2dp_source_service_name), (uint8_t *) default_a2dp_source_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_a2dp_source_service_provider_name), (uint8_t *) default_a2dp_source_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);
}
static void a2dp_streaming_emit_can_send_media_packet_now(btstack_packet_handler_t callback, uint16_t cid, uint8_t seid){
if (!callback) return;
uint8_t event[8];
int pos = 0;
event[pos++] = HCI_EVENT_A2DP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW;
little_endian_store_16(event, pos, cid);
pos += 2;
event[pos++] = seid;
(*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
static inline void a2dp_signaling_emit_media_codec_sbc(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){
if (!callback) return;
if (event_size < 18) return;
event[0] = HCI_EVENT_A2DP_META;
event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION;
(*callback)(HCI_EVENT_PACKET, 0, event, event_size);
}
static inline void a2dp_signaling_emit_reject_cmd(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){
if (!callback) return;
if (event_size < 18) return;
event[0] = HCI_EVENT_A2DP_META;
event[2] = A2DP_SUBEVENT_COMMAND_REJECTED;
(*callback)(HCI_EVENT_PACKET, 0, event, event_size);
}
static void a2dp_signaling_emit_connection_established(btstack_packet_handler_t callback, uint16_t cid, bd_addr_t addr, uint8_t status){
if (!callback) return;
uint8_t event[12];
int pos = 0;
event[pos++] = HCI_EVENT_A2DP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED;
little_endian_store_16(event, pos, cid);
pos += 2;
reverse_bd_addr(addr,&event[pos]);
pos += 6;
event[pos++] = status;
(*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
static void a2dp_signaling_emit_control_command(btstack_packet_handler_t callback, uint16_t cid, uint8_t local_seid, uint8_t cmd){
if (!callback) return;
uint8_t event[6];
int pos = 0;
event[pos++] = HCI_EVENT_A2DP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = cmd;
little_endian_store_16(event, pos, cid);
pos += 2;
event[pos++] = local_seid;
(*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
uint8_t signal_identifier;
uint8_t status;
uint8_t local_seid;
uint8_t remote_seid;
uint16_t cid;
bd_addr_t address;
if (packet_type != HCI_EVENT_PACKET) return;
if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return;
switch (packet[2]){
case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED:{
avdtp_subevent_signaling_connection_established_get_bd_addr(packet, sc.remote_addr);
cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet);
status = avdtp_subevent_signaling_connection_established_get_status(packet);
if (status != 0){
log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status);
app_state = A2DP_IDLE;
a2dp_signaling_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, status);
break;
}
log_info("A2DP_SUBEVENT_SIGNALING_CONNECTION established avdtp_cid 0x%02x ---", a2dp_source_context.avdtp_cid);
sc.active_remote_sep = NULL;
sc.active_remote_sep_index = 0;
app_state = A2DP_W2_DISCOVER_SEPS;
remote_seps_index = 0;
memset(remote_seps, 0, sizeof(avdtp_sep_t) * AVDTP_MAX_SEP_NUM);
a2dp_signaling_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, status);
avdtp_source_discover_stream_endpoints(cid);
break;
}
case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{
log_info("A2DP received SBC capability.");
if (!sc.local_stream_endpoint) {
log_error("invalid local seid %d", avdtp_subevent_signaling_media_codec_sbc_capability_get_local_seid(packet));
return;
}
log_info("A2DP received SBC capability.");
uint8_t sampling_frequency = avdtp_choose_sbc_sampling_frequency(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_sampling_frequency_bitmap(packet));
uint8_t channel_mode = avdtp_choose_sbc_channel_mode(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_channel_mode_bitmap(packet));
uint8_t block_length = avdtp_choose_sbc_block_length(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_block_length_bitmap(packet));
uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet));
uint8_t allocation_method = avdtp_choose_sbc_allocation_method(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_allocation_method_bitmap(packet));
uint8_t max_bitpool_value = avdtp_choose_sbc_max_bitpool_value(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_max_bitpool_value(packet));
uint8_t min_bitpool_value = avdtp_choose_sbc_min_bitpool_value(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_min_bitpool_value(packet));
sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode;
sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method;
sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value;
sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value;
sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1);
sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO;
sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC;
app_state = A2DP_W2_SET_CONFIGURATION;
break;
}
case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY:
log_info("received non SBC codec. not implemented");
break;
case AVDTP_SUBEVENT_SIGNALING_MEDIA_TRANSPORT_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_MEDIA_TRANSPORT_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_media_transport_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_REPORTING_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_REPORTING_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_reporting_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_delay_reporting_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_RECOVERY_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_RECOVERY_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_recovery_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_CONTENT_PROTECTION_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_CONTENT_PROTECTION_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_content_protection_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_HEADER_COMPRESSION_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_HEADER_COMPRESSION_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_header_compression_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_MULTIPLEXING_CAPABILITY:
log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_MULTIPLEXING_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_multiplexing_capability_get_remote_seid(packet));
break;
case AVDTP_SUBEVENT_SIGNALING_CAPABILITY_DONE:
break;
case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{
// TODO check cid
sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet);
sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet);
sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet);
sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1;
sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet);
sc.channel_mode = avdtp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet);
// TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet);
log_info("A2DP received SBC Config: sample rate %u, max bitpool %u.", sc.sampling_frequency, sc.max_bitpool_value);
app_state = A2DP_W2_OPEN_STREAM_WITH_SEID;
a2dp_signaling_emit_media_codec_sbc(a2dp_source_context.a2dp_callback, packet, size);
break;
}
case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW:
cid = avdtp_subevent_streaming_can_send_media_packet_now_get_avdtp_cid(packet);
a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, cid, 0);
break;
case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED:
avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address);
status = avdtp_subevent_streaming_connection_established_get_status(packet);
cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet);
remote_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet);
local_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet);
if (status != 0){
log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, avdtp_cid 0x%02x, status 0x%02x ---", cid, status);
a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, status);
break;
}
log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", cid, local_seid, remote_seid);
app_state = A2DP_STREAMING_OPENED;
a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, 0);
break;
case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND:{
avdtp_sep_t sep;
sep.seid = avdtp_subevent_signaling_sep_found_get_remote_seid(packet);;
sep.in_use = avdtp_subevent_signaling_sep_found_get_in_use(packet);
sep.media_type = avdtp_subevent_signaling_sep_found_get_media_type(packet);
sep.type = avdtp_subevent_signaling_sep_found_get_sep_type(packet);
log_info("Found sep: seid %u, in_use %d, media type %d, sep type %d (1-SNK)", sep.seid, sep.in_use, sep.media_type, sep.type);
remote_seps[remote_seps_index++] = sep;
break;
}
case AVDTP_SUBEVENT_SIGNALING_SEP_DICOVERY_DONE:
app_state = A2DP_W2_GET_CAPABILITIES;
sc.active_remote_sep_index = 0;
break;
case AVDTP_SUBEVENT_SIGNALING_ACCEPT:
// TODO check cid
signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet);
cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet);
log_info("A2DP Accepted %d, state %d", signal_identifier, app_state);
switch (app_state){
case A2DP_W2_GET_CAPABILITIES:
if (sc.active_remote_sep_index < remote_seps_index){
sc.active_remote_sep = &remote_seps[sc.active_remote_sep_index++];
avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid);
}
break;
case A2DP_W2_SET_CONFIGURATION:{
if (!sc.local_stream_endpoint) return;
log_info("A2DP initiate set configuration locally and wait for response ... ");
app_state = A2DP_IDLE;
avdtp_source_set_configuration(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid, sc.local_stream_endpoint->remote_configuration_bitmap, sc.local_stream_endpoint->remote_configuration);
break;
}
case A2DP_W2_OPEN_STREAM_WITH_SEID:{
log_info("A2DP open stream ");
app_state = A2DP_W4_OPEN_STREAM_WITH_SEID;
avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid);
break;
}
case A2DP_STREAMING_OPENED:
if (!a2dp_source_context.a2dp_callback) return;
switch (signal_identifier){
case AVDTP_SI_START:
a2dp_signaling_emit_control_command(a2dp_source_context.a2dp_callback, cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), A2DP_SUBEVENT_STREAM_STARTED);
break;
case AVDTP_SI_SUSPEND:
a2dp_signaling_emit_control_command(a2dp_source_context.a2dp_callback, cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), A2DP_SUBEVENT_STREAM_SUSPENDED);
break;
case AVDTP_SI_ABORT:
case AVDTP_SI_CLOSE:
a2dp_signaling_emit_control_command(a2dp_source_context.a2dp_callback, cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), A2DP_SUBEVENT_STREAM_STOPPED);
break;
default:
break;
}
break;
default:
app_state = A2DP_IDLE;
break;
}
break;
case AVDTP_SUBEVENT_SIGNALING_REJECT:
case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT:
app_state = A2DP_IDLE;
a2dp_signaling_emit_reject_cmd(a2dp_source_context.a2dp_callback, packet, size);
break;
case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:{
app_state = A2DP_IDLE;
uint8_t event[6];
int pos = 0;
event[pos++] = HCI_EVENT_A2DP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED;
little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet));
pos += 2;
event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet);
(*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
break;
}
case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:{
app_state = A2DP_IDLE;
uint8_t event[6];
int pos = 0;
event[pos++] = HCI_EVENT_A2DP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED;
little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet));
pos += 2;
event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet);
(*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
break;
}
default:
app_state = A2DP_IDLE;
log_info("not implemented");
break;
}
}
void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){
if (callback == NULL){
log_error("a2dp_source_register_packet_handler called with NULL callback");
return;
}
avdtp_source_register_packet_handler(&packet_handler);
a2dp_source_context.a2dp_callback = callback;
}
void a2dp_source_init(void){
avdtp_source_init(&a2dp_source_context);
l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0);
}
avdtp_stream_endpoint_t * a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type,
uint8_t * codec_capabilities, uint16_t codec_capabilities_len,
uint8_t * media_codec_info, uint16_t media_codec_info_len){
avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type);
if (!local_stream_endpoint){
return NULL;
}
avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint));
avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type,
codec_capabilities, codec_capabilities_len);
local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info;
local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len;
sc.local_stream_endpoint = local_stream_endpoint;
return local_stream_endpoint;
}
uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * a2dp_cid){
sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context);
if (!sc.local_stream_endpoint){
log_error(" no local_stream_endpoint for seid %d", loc_seid);
return AVDTP_SEID_DOES_NOT_EXIST;
}
memcpy(sc.remote_addr, remote_addr, 6);
return avdtp_source_connect(remote_addr, a2dp_cid);
}
uint8_t a2dp_source_disconnect(uint16_t a2dp_cid){
return avdtp_disconnect(a2dp_cid, &a2dp_source_context);
}
uint8_t a2dp_source_start_stream(uint16_t a2dp_cid, uint8_t local_seid){
return avdtp_start_stream(a2dp_cid, local_seid, &a2dp_source_context);
}
uint8_t a2dp_source_pause_stream(uint16_t a2dp_cid, uint8_t local_seid){
return avdtp_suspend_stream(a2dp_cid, local_seid, &a2dp_source_context);
}
static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){
if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){
log_error("small outgoing buffer");
return;
}
uint8_t rtp_version = 2;
uint8_t padding = 0;
uint8_t extension = 0;
uint8_t csrc_count = 0;
uint8_t payload_type = 0x60;
// uint16_t sequence_number = stream_endpoint->sequence_number;
uint32_t timestamp = btstack_run_loop_get_time_ms();
uint32_t ssrc = 0x11223344;
// rtp header (min size 12B)
int pos = 0;
// int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid);
media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count;
media_packet[pos++] = (marker << 1) | payload_type;
big_endian_store_16(media_packet, pos, sequence_number);
pos += 2;
big_endian_store_32(media_packet, pos, timestamp);
pos += 4;
big_endian_store_32(media_packet, pos, ssrc); // only used for multicast
pos += 4;
*offset = pos;
}
void a2dp_source_stream_endpoint_request_can_send_now(uint16_t a2dp_cid, uint8_t local_seid){
avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context);
if (!stream_endpoint) {
log_error("A2DP source: no stream_endpoint with seid %d", local_seid);
return;
}
if (a2dp_source_context.avdtp_cid != a2dp_cid){
log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid);
return;
}
stream_endpoint->send_stream = 1;
avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid);
}
int a2dp_max_media_payload_size(uint16_t a2dp_cid, uint8_t local_seid){
avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context);
if (!stream_endpoint) {
log_error("A2DP source: no stream_endpoint with seid %d", local_seid);
return 0;
}
if (a2dp_source_context.avdtp_cid != a2dp_cid){
log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid);
return 0;
}
if (stream_endpoint->l2cap_media_cid == 0){
log_error("A2DP source: no media connection for seid %d", local_seid);
return 0;
}
return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE;
}
static void a2dp_source_copy_media_payload(uint8_t * media_packet, int size, int * offset, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames){
if (size < num_bytes_to_copy + 1){
log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1);
return;
}
int pos = *offset;
media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames;
memcpy(media_packet + pos, storage, num_bytes_to_copy);
pos += num_bytes_to_copy;
*offset = pos;
}
int a2dp_source_stream_send_media_payload(uint16_t a2dp_cid, uint8_t local_seid, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames, uint8_t marker){
avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context);
if (!stream_endpoint) {
log_error("A2DP source: no stream_endpoint with seid %d", local_seid);
return 0;
}
if (a2dp_source_context.avdtp_cid != a2dp_cid){
log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid);
return 0;
}
if (stream_endpoint->l2cap_media_cid == 0){
log_error("A2DP source: no media connection for seid %d", local_seid);
return 0;
}
int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid);
int offset = 0;
l2cap_reserve_packet_buffer();
uint8_t * media_packet = l2cap_get_outgoing_buffer();
//int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid);
a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number);
a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames);
stream_endpoint->sequence_number++;
l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset);
return size;
}
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