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RTPMIDI.cpp
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RTPMIDI.cpp
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/* Copyright (c) 2021 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "RTPMIDI.h"
#include "LWIPStack.h"
#include "rtos.h"
#include <chrono>
using namespace std::chrono_literals;
RTPMIDI::RTPMIDI()
: _net(NetworkInterface::get_default_instance()), _rtp_queue(32 * EVENTS_EVENT_SIZE)
{
_init();
}
RTPMIDI::RTPMIDI(NetworkInterface *net) : _net(net)
{
_init();
}
RTPMIDI::~RTPMIDI()
{
if (_net) {
_net->disconnect();
}
}
void RTPMIDI::participate()
{
if (!_net) {
printf("Error! No network interface found.\r\n");
return;
}
nsapi_size_or_error_t result = _net->connect();
if (result !=0) {
printf("Error! _net->connect() returned: %d\r\n", result);
return;
}
// Show the network address
SocketAddress sockAddr;
_net->get_ip_address(&sockAddr);
printf("IP address is: %s\n", sockAddr.get_ip_address() ? sockAddr.get_ip_address() : "No IP");
/* open sockets */
_control_socket.open(_net);
_midi_socket.open(_net);
/* bind sockets to ports */
_control_socket.bind(CONTROL_PORT);
_midi_socket.bind(MIDI_PORT);
/* Try to receive Invitation Packet on control port */
printf("Waiting for invitation...\r\n");
exchange_packet_t setupInvitation;
_control_socket.recvfrom(&_peer_address, &setupInvitation, sizeof(exchange_packet_t));
if (setupInvitation.command != lwip_htons(INV_COMMAND)) {
printf("Error! Received: '%d' command, not 'IN' command.\r\n", setupInvitation.command);
return;
}
printf("invitation received from %s:%d... sending response... \r\n", _peer_address.get_ip_address(), _peer_address.get_port());
/* Send response packet on control port */
exchange_packet_t setupResponse = {
EXCHANGE_SIGNATURE,
lwip_htons(ACCEPT_INV_COMMAND),
lwip_htonl(PROTOCOL_VERSION),
setupInvitation.initiator_token,
lwip_htonl(SSRC_NUMBER),
NAME
};
_control_socket.sendto(_peer_address, &setupResponse, sizeof(exchange_packet_t));
printf("Response sent \r\n");
/* Try to receive Invitation Packet on midi port */
printf("Waiting for invitation...\r\n");
_midi_socket.recvfrom(&_peer_address, &setupInvitation, sizeof(exchange_packet_t));
if (setupInvitation.command != lwip_htons(INV_COMMAND)) {
printf("Error! Received: '%d' command, not 'IN' command.\r\n", setupInvitation.command);
return;
}
printf("invitation received from %s:%d... sending response... \r\n", _peer_address.get_ip_address(), _peer_address.get_port());
/* Send response packet on midi port */
_midi_socket.sendto(_peer_address, &setupResponse, sizeof(exchange_packet_t));
printf("Response sent \r\n");
/* Set up synchronization */
Event<void()> sync_event = _rtp_queue.event(this, &RTPMIDI::_synchronise);
sync_event.period(50s);
sync_event.post();
_rtp_thread.start(callback(&_rtp_queue, &EventQueue::dispatch_forever));
}
void RTPMIDI::write(MIDIMessage msg)
{
printf("write start\r\n");
/* Check if we need to clear the buffer */
if (_out_buffer_size + msg.length > MAX_MIDI_COMMAND_LEN) {
_send_midi_buffer();
}
/* Replace first byte (CN) with relative timestamp */
_out_buffer[_out_buffer_pos++] = 0x0;
for (int i = 1; i < msg.length; ++i) {
_out_buffer[_out_buffer_pos++] = msg.data[i];
}
_out_buffer_size += msg.length;
printf("write end\r\n");
}
void RTPMIDI::_init()
{
printf("init start\r\n");
//TODO: Support variable length MIDI Command headers
/* Set up empty buffer - headers live at start */
_out_buffer_size = 0;
_out_buffer_pos = MidiHeaderLength;
midi_packet_header_t *header_p = (midi_packet_header_t *) _out_buffer;
header_p->vpxcc = VPXCC;
header_p->mpayload = MPAYLOAD;
header_p->sequence_number = SEQ_NR;
header_p->sender_ssrc = SSRC_NUMBER;
// B = 0, J = 0, Z = 1, P = 0, LEN = 0000
midi_command_header_t *command_header_p = &_out_buffer[sizeof(midi_packet_header_t)];
*command_header_p = 0;
*command_header_p &= ~RTP_CS_FLAG_B;
*command_header_p &= ~RTP_CS_FLAG_J;
*command_header_p |= RTP_CS_FLAG_Z;
*command_header_p &= ~RTP_CS_FLAG_P;
/* Initialize sequence number */
_sequence_number = SEQ_NR;
printf("init end\r\n");
}
uint64_t RTPMIDI::_calculate_current_timestamp()
{
/* Get count from timepoint returned by now() and divide to give 100us */
return Kernel::Clock::now().time_since_epoch().count() / 10;
}
void RTPMIDI::_send_midi_buffer()
{
printf("send start\r\n");
/* Set timestamp */
midi_packet_header_t *header_p = (midi_packet_header_t *) _out_buffer;
header_p->timestamp = lwip_htonl((uint32_t)_calculate_current_timestamp());
header_p->sender_ssrc = lwip_htonl(SSRC_NUMBER);
header_p->sequence_number = lwip_htons(_sequence_number++);
/* Clear and set LEN field */
midi_command_header_t *command_header_p = &_out_buffer[sizeof(midi_packet_header_t)];
*command_header_p &= ~RTP_CS_LEN;
*command_header_p |= (_out_buffer_size & RTP_CS_LEN);
/* Send the buffer */
_midi_socket.sendto(_peer_address, _out_buffer, MidiHeaderLength + _out_buffer_size);
/* Reset Buffer */
_out_buffer_pos = MidiHeaderLength;
_out_buffer_size = 0;
printf("send end\r\n");
}
void RTPMIDI::_synchronise()
{
printf("Synch starting \r\n");
/* Receive Synchronisation CK0 */
timestamp_packet_t synch;
_midi_socket.recvfrom(&_peer_address, &synch, sizeof(timestamp_packet_t));
/* Send Synchronisation CK1 */
synch.sender_ssrc = lwip_htonl(SSRC_NUMBER);
synch.count = SYNC_CK1;
// network byte order
synch.timestamp[SYNC_CK1] = htonll(_calculate_current_timestamp());
_midi_socket.sendto(_peer_address, &synch, sizeof(exchange_packet_t));
/* Receive synchronisation CK2 */
_midi_socket.recvfrom(&_peer_address, &synch, sizeof(timestamp_packet_t));
}