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hci: recombine iso packets

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This commit is contained in:
Matthias Ringwald 2022-05-06 15:26:21 +02:00
parent 4ae8623ec0
commit d39e4f950b
1 changed files with 81 additions and 3 deletions
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84
src/hci.c
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@ -229,6 +229,7 @@ static void hci_iso_stream_finalize(hci_iso_stream_t * iso_stream);
static hci_iso_stream_t * hci_iso_stream_for_cis_handle(hci_con_handle_t cis_handle);
static void hci_iso_stream_requested_finalize(void);
static void hci_iso_stream_requested_confirm(void);
static void hci_iso_packet_handler(uint8_t * packet, uint16_t size);
#endif /* ENABLE_LE_ISOCHRONOUS_STREAMS */
#endif /* ENABLE_BLE */
@ -3870,9 +3871,7 @@ static void packet_handler(uint8_t packet_type, uint8_t *packet, uint16_t size){
#endif
#ifdef ENABLE_LE_ISOCHRONOUS_STREAMS
case HCI_ISO_DATA_PACKET:
if (hci_stack->iso_packet_handler != NULL){
(hci_stack->iso_packet_handler)(HCI_ISO_DATA_PACKET, 0, packet, size);
}
hci_iso_packet_handler(packet, size);
break;
#endif
default:
@ -8507,6 +8506,85 @@ static void hci_iso_stream_requested_confirm(void){
}
}
}
static bool hci_iso_sdu_complete(uint8_t * packet, uint16_t size){
uint8_t sdu_ts_flag = (packet[1] >> 6) & 1;
uint16_t sdu_len_offset = 6 + (sdu_ts_flag * 4);
uint16_t sdu_len = little_endian_read_16(packet, sdu_len_offset) & 0x0fff;
return (sdu_len_offset + 2 + sdu_len) == size;
}
static void hci_iso_packet_handler(uint8_t * packet, uint16_t size){
if (hci_stack->iso_packet_handler == NULL) {
return;
}
if (size < 4) {
return;
}
// parse header
uint16_t conn_handle_and_flags = little_endian_read_16(packet, 0);
uint16_t iso_data_len = little_endian_read_16(packet, 2);
hci_con_handle_t cis_handle = (hci_con_handle_t) (conn_handle_and_flags & 0xfff);
hci_iso_stream_t * iso_stream = hci_iso_stream_for_cis_handle(cis_handle);
uint8_t pb_flag = (conn_handle_and_flags >> 12) & 3;
// assert packet is complete
if ((iso_data_len + 4u) != size){
return;
}
if ((pb_flag & 0x01) == 0){
if (pb_flag == 0x02){
// The ISO_Data_Load field contains a header and a complete SDU.
if (hci_iso_sdu_complete(packet, size)) {
(hci_stack->iso_packet_handler)(HCI_ISO_DATA_PACKET, 0, packet, size);
}
} else {
// The ISO_Data_Load field contains a header and the first fragment of a fragmented SDU.
if (iso_stream == NULL){
return;
}
if (size > HCI_ISO_PAYLOAD_SIZE){
return;
}
memcpy(iso_stream->reassembly_buffer, packet, size);
// fix pb_flag
iso_stream->reassembly_buffer[1] = (iso_stream->reassembly_buffer[1] & 0xcf) | 0x20;
iso_stream->reassembly_pos = size;
}
} else {
// iso_data_load contains continuation or last fragment of an SDU
uint8_t ts_flag = (conn_handle_and_flags >> 14) & 1;
if (ts_flag != 0){
return;
}
// append fragment
if (iso_stream == NULL){
return;
}
if (iso_stream->reassembly_pos == 0){
return;
}
if ((iso_stream->reassembly_pos + iso_data_len) > size){
// reset reassembly buffer
iso_stream->reassembly_pos = 0;
return;
}
memcpy(&iso_stream->reassembly_buffer[iso_stream->reassembly_pos], &packet[4], iso_data_len);
iso_stream->reassembly_pos += iso_data_len;
// deliver if last fragment and SDU complete
if (pb_flag == 0x03){
if (hci_iso_sdu_complete(iso_stream->reassembly_buffer, iso_stream->reassembly_pos)){
(hci_stack->iso_packet_handler)(HCI_ISO_DATA_PACKET, 0, iso_stream->reassembly_buffer, iso_stream->reassembly_pos);
}
iso_stream->reassembly_pos = 0;
}
}
}
#endif
#endif /* ENABLE_BLE */