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cs-midi/MIDI_Interfaces/AppleMIDI/vendor/AppleMIDI_Parser.h

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#pragma once
#include "utility/Deque.h"
#include "AppleMIDI_Defs.h"
#include "AppleMIDI_Settings.h"
#include "AppleMIDI_Namespace.h"
BEGIN_APPLEMIDI_NAMESPACE
template <class UdpClass, class Settings, class Platform>
class AppleMIDISession;
template <class UdpClass, class Settings, class Platform>
class AppleMIDIParser
{
public:
AppleMIDISession<UdpClass, Settings, Platform> *session;
parserReturn parse(RtpBuffer_t &buffer, const amPortType &portType)
{
conversionBuffer cb;
uint8_t signature[2]; // Signature "Magic Value" for Apple network MIDI session establishment
uint8_t command[2]; // 16-bit command identifier (two ASCII characters, first in high 8 bits, second in low 8 bits)
size_t minimumLen = (sizeof(signature) + sizeof(command)); // Signature + Command
if (buffer.size() < minimumLen)
return parserReturn::NotSureGiveMeMoreData;
size_t i = 0;
signature[0] = buffer[i++];
signature[1] = buffer[i++];
if (0 != memcmp(signature, amSignature, sizeof(amSignature)))
{
return parserReturn::UnexpectedData;
}
command[0] = buffer[i++];
command[1] = buffer[i++];
if (0 == memcmp(command, amInvitation, sizeof(amInvitation)))
{
uint8_t protocolVersion[4];
minimumLen += (sizeof(protocolVersion) + sizeof(initiatorToken_t) + sizeof(ssrc_t));
if (buffer.size() < minimumLen)
{
return parserReturn::NotEnoughData;
}
// 2 (stored in network byte order (big-endian))
protocolVersion[0] = buffer[i++];
protocolVersion[1] = buffer[i++];
protocolVersion[2] = buffer[i++];
protocolVersion[3] = buffer[i++];
if (0 != memcmp(protocolVersion, amProtocolVersion, sizeof(amProtocolVersion)))
{
return parserReturn::UnexpectedData;
}
AppleMIDI_Invitation invitation;
// A random number generated by the session's APPLEMIDI_INITIATOR.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
invitation.initiatorToken = __ntohl(cb.value32);
// The sender's synchronization source identifier.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
invitation.ssrc = __ntohl(cb.value32);
#ifdef KEEP_SESSION_NAME
uint16_t bi = 0;
while (i < buffer.size())
{
if (bi < Settings::MaxSessionNameLen)
invitation.sessionName[bi++] = buffer[i++];
else
i++;
}
invitation.sessionName[bi++] = '\0';
#else
while (i < buffer.size())
i++;
#endif
auto retVal = parserReturn::Processed;
// when given a Session Name and the buffer has been fully processed and the
// last character is not 'endl', then we got a very long sessionName. It will
// continue in the next memory chunk of the packet. We don't care, so indicated
// flush the remainder of the packet.
// First part if the session name is kept, processing continues
if (i > minimumLen)
if (i == buffer.size() && buffer[buffer.size() - 1] != 0x00)
retVal = parserReturn::SessionNameVeryLong;
while (i > 0)
{
buffer.pop_front(); // consume all the bytes that made up this message
--i;
}
session->ReceivedInvitation(invitation, portType);
return retVal;
}
else if (0 == memcmp(command, amEndSession, sizeof(amEndSession)))
{
uint8_t protocolVersion[4];
minimumLen += (sizeof(protocolVersion) + sizeof(initiatorToken_t) + sizeof(ssrc_t));
if (buffer.size() < minimumLen)
return parserReturn::NotEnoughData;
// 2 (stored in network byte order (big-endian))
protocolVersion[0] = buffer[i++];
protocolVersion[1] = buffer[i++];
protocolVersion[2] = buffer[i++];
protocolVersion[3] = buffer[i++];
if (0 != memcmp(protocolVersion, amProtocolVersion, sizeof(amProtocolVersion)))
{
return parserReturn::UnexpectedData;
}
AppleMIDI_EndSession_t endSession;
// A random number generated by the session's APPLEMIDI_INITIATOR.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
endSession.initiatorToken = __ntohl(cb.value32);
// The sender's synchronization source identifier.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
endSession.ssrc = __ntohl(cb.value32);
while (i > 0)
{
buffer.pop_front(); // consume all the bytes that made up this message
--i;
}
session->ReceivedEndSession(endSession);
return parserReturn::Processed;
}
else if (0 == memcmp(command, amSynchronization, sizeof(amSynchronization)))
{
AppleMIDI_Synchronization_t synchronization;
// minimum amount : 4 bytes for sender SSRC, 1 byte for count, 3 bytes padding and 3 times 8 bytes
minimumLen += (4 + 1 + 3 + (3 * 8));
if (buffer.size() < minimumLen)
return parserReturn::NotEnoughData;
// The sender's synchronization source identifier.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
synchronization.ssrc = __ntohl(cb.value32);
synchronization.count = buffer[i++];
buffer[i++];
buffer[i++];
buffer[i++]; // padding, unused
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
cb.buffer[4] = buffer[i++];
cb.buffer[5] = buffer[i++];
cb.buffer[6] = buffer[i++];
cb.buffer[7] = buffer[i++];
synchronization.timestamps[0] = __ntohll(cb.value64);
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
cb.buffer[4] = buffer[i++];
cb.buffer[5] = buffer[i++];
cb.buffer[6] = buffer[i++];
cb.buffer[7] = buffer[i++];
synchronization.timestamps[1] = __ntohll(cb.value64);
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
cb.buffer[4] = buffer[i++];
cb.buffer[5] = buffer[i++];
cb.buffer[6] = buffer[i++];
cb.buffer[7] = buffer[i++];
synchronization.timestamps[2] = __ntohll(cb.value64);
while (i > 0)
{
buffer.pop_front(); // consume all the bytes that made up this message
--i;
}
session->ReceivedSynchronization(synchronization);
return parserReturn::Processed;
}
else if (0 == memcmp(command, amReceiverFeedback, sizeof(amReceiverFeedback)))
{
AppleMIDI_ReceiverFeedback_t receiverFeedback;
minimumLen += (sizeof(receiverFeedback.ssrc) + sizeof(receiverFeedback.sequenceNr) + sizeof(receiverFeedback.dummy));
if (buffer.size() < minimumLen)
return parserReturn::NotEnoughData;
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
receiverFeedback.ssrc = __ntohl(cb.value32);
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
receiverFeedback.sequenceNr = __ntohs(cb.value16);
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
receiverFeedback.dummy = __ntohs(cb.value16);
while (i--)
buffer.pop_front(); // consume all the bytes that made up this message
session->ReceivedReceiverFeedback(receiverFeedback);
return parserReturn::Processed;
}
#ifdef APPLEMIDI_INITIATOR
else if (0 == memcmp(command, amInvitationAccepted, sizeof(amInvitationAccepted)))
{
uint8_t protocolVersion[4];
minimumLen += (sizeof(protocolVersion) + sizeof(initiatorToken_t) + sizeof(ssrc_t));
if (buffer.size() < minimumLen)
{
return parserReturn::NotEnoughData;
}
// 2 (stored in network byte order (big-endian))
protocolVersion[0] = buffer[i++];
protocolVersion[1] = buffer[i++];
protocolVersion[2] = buffer[i++];
protocolVersion[3] = buffer[i++];
if (0 != memcmp(protocolVersion, amProtocolVersion, sizeof(amProtocolVersion)))
{
return parserReturn::UnexpectedData;
}
AppleMIDI_InvitationAccepted_t invitationAccepted;
// A random number generated by the session's APPLEMIDI_INITIATOR.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
invitationAccepted.initiatorToken = __ntohl(cb.value32);
// The sender's synchronization source identifier.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
invitationAccepted.ssrc = __ntohl(cb.value32);
#ifdef KEEP_SESSION_NAME
uint16_t bi = 0;
while (i < buffer.size())
{
if (bi < Settings::MaxSessionNameLen)
invitationAccepted.sessionName[bi++] = buffer[i++];
else
i++;
}
invitationAccepted.sessionName[bi++] = '\0';
#else
while (i < buffer.size())
i++;
#endif
auto retVal = parserReturn::Processed;
// when given a Session Name and the buffer has been fully processed and the
// last character is not 'endl', then we got a very long sessionName. It will
// continue in the next memory chunk of the packet. We don't care, so indicated
// flush the remainder of the packet.
// First part if the session name is kept, processing continues
if (i > minimumLen)
if (i == buffer.size() && buffer[buffer.size() - 1] != 0x00)
retVal = parserReturn::SessionNameVeryLong;
while (i > 0)
{
buffer.pop_front(); // consume all the bytes that made up this message
--i;
}
session->ReceivedInvitationAccepted(invitationAccepted, portType);
return retVal;
}
else if (0 == memcmp(command, amInvitationRejected, sizeof(amInvitationRejected)))
{
uint8_t protocolVersion[4];
minimumLen += (sizeof(protocolVersion) + sizeof(initiatorToken_t) + sizeof(ssrc_t));
if (buffer.size() < minimumLen)
{
return parserReturn::NotEnoughData;
}
// 2 (stored in network byte order (big-endian))
protocolVersion[0] = buffer[i++];
protocolVersion[1] = buffer[i++];
protocolVersion[2] = buffer[i++];
protocolVersion[3] = buffer[i++];
if (0 != memcmp(protocolVersion, amProtocolVersion, sizeof(amProtocolVersion)))
{
return parserReturn::UnexpectedData;
}
AppleMIDI_InvitationRejected_t invitationRejected;
// A random number generated by the session's APPLEMIDI_INITIATOR.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
invitationRejected.initiatorToken = __ntohl(cb.value32);
// The sender's synchronization source identifier.
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
invitationRejected.ssrc = __ntohl(cb.value32);
#ifdef KEEP_SESSION_NAME
uint16_t bi = 0;
while ((i < buffer.size()) && (buffer[i] != 0x00))
{
if (bi < Settings::MaxSessionNameLen)
invitationRejected.sessionName[bi++] = buffer[i];
i++;
}
invitationRejected.sessionName[bi++] = '\0';
#else
while ((i < buffer.size()) && (buffer[i] != 0x00))
i++;
#endif
// session name is optional.
// If i > minimum size (16), then a sessionName was provided and must include 0x00
if (i > minimumLen)
if (i == buffer.size() || buffer[i++] != 0x00)
return parserReturn::NotEnoughData;
while (i > 0)
{
buffer.pop_front(); // consume all the bytes that made up this message
--i;
}
session->ReceivedInvitationRejected(invitationRejected);
return parserReturn::Processed;
}
else if (0 == memcmp(command, amBitrateReceiveLimit, sizeof(amBitrateReceiveLimit)))
{
AppleMIDI_BitrateReceiveLimit bitrateReceiveLimit;
minimumLen += (sizeof(bitrateReceiveLimit.ssrc) + sizeof(bitrateReceiveLimit.bitratelimit));
if (buffer.size() < minimumLen)
return parserReturn::NotEnoughData;
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
bitrateReceiveLimit.ssrc = __ntohl(cb.value32);
cb.buffer[0] = buffer[i++];
cb.buffer[1] = buffer[i++];
cb.buffer[2] = buffer[i++];
cb.buffer[3] = buffer[i++];
bitrateReceiveLimit.bitratelimit = __ntohl(cb.value32);
while (i > 0)
{
buffer.pop_front(); // consume all the bytes that made up this message
--i;
}
session->ReceivedBitrateReceiveLimit(bitrateReceiveLimit);
return parserReturn::Processed;
}
#endif
return parserReturn::UnexpectedData;
}
};
END_APPLEMIDI_NAMESPACE
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