JackRequest.h

/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004-2008 Grame

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

#ifndef __JackRequest__
#define __JackRequest__

#include "JackConstants.h"
#include "JackError.h"
#include "JackPlatformPlug.h"
#include "JackChannel.h"
#include "JackTime.h"
#include "types.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <list>

namespace Jack
{

#define CheckRes(exp) { if ((exp) < 0) { jack_error("CheckRes error"); return -1; } }
#define CheckSize() { CheckRes(trans->Read(&fSize, sizeof(int))); if (fSize != Size()) { jack_error("CheckSize error size = %d Size() = %d", fSize, Size()); return -1; } }

/*!
\brief Session API constants.
*/

enum JackSessionReply {

    kImmediateSessionReply = 1,
    kPendingSessionReply = 2

};

/*!
\brief Request from client to server.
*/

struct JackRequest
{

    enum RequestType {
        kRegisterPort = 1,
        kUnRegisterPort = 2,
        kConnectPorts = 3,
        kDisconnectPorts = 4,
        kSetTimeBaseClient = 5,
        kActivateClient = 6,
        kDeactivateClient = 7,
        kDisconnectPort = 8,
        kSetClientCapabilities = 9,
        kGetPortConnections = 10,
        kGetPortNConnections = 11,
        kReleaseTimebase = 12,
        kSetTimebaseCallback = 13,
        kSetBufferSize = 20,
        kSetFreeWheel = 21,
        kClientCheck = 22,
        kClientOpen = 23,
        kClientClose = 24,
        kConnectNamePorts = 25,
        kDisconnectNamePorts = 26,
        kGetInternalClientName = 27,
        kInternalClientHandle = 28,
        kInternalClientLoad = 29,
        kInternalClientUnload = 30,
        kPortRename = 31,
        kNotification = 32,
        kSessionNotify = 33,
        kSessionReply  = 34,
        kGetClientByUUID = 35,
        kReserveClientName = 36,
        kGetUUIDByClient = 37,
        kClientHasSessionCallback = 38,
        kComputeTotalLatencies = 39
    };

    RequestType fType;
    int fSize;

    JackRequest(): fType((RequestType)0), fSize(0)
    {}

    JackRequest(RequestType type): fType(type), fSize(0)
    {}

    virtual ~JackRequest()
    {}

    virtual int Read(detail::JackChannelTransactionInterface* trans)
    {
        return trans->Read(&fType, sizeof(RequestType));
    }

    virtual int Write(detail::JackChannelTransactionInterface* trans) { return -1; }
    
    virtual int Write(detail::JackChannelTransactionInterface* trans, int size)
    {
        fSize = size;
        CheckRes(trans->Write(&fType, sizeof(RequestType)));
        return trans->Write(&fSize, sizeof(int));
    }
    
    virtual int Size() { return 0; }

};

/*!
\brief Result from the server.
*/

struct JackResult
{

    int fResult;

    JackResult(): fResult( -1)
    {}
    JackResult(int result): fResult(result)
    {}
    virtual ~JackResult()
    {}

    virtual int Read(detail::JackChannelTransactionInterface* trans)
    {
        return trans->Read(&fResult, sizeof(int));
    }

    virtual int Write(detail::JackChannelTransactionInterface* trans)
    {
        return trans->Write(&fResult, sizeof(int));
    }

};

/*!
\brief CheckClient request.
*/

struct JackClientCheckRequest : public JackRequest
{

    char fName[JACK_CLIENT_NAME_SIZE+1];
    int fProtocol;
    int fOptions;
    int fUUID;
    int fOpen;

    JackClientCheckRequest() : fProtocol(0), fOptions(0), fUUID(0), fOpen(0)
    {
        memset(fName, 0, sizeof(fName));
    }
    JackClientCheckRequest(const char* name, int protocol, int options, int uuid, int open = false)
        : JackRequest(JackRequest::kClientCheck), fProtocol(protocol), fOptions(options), fUUID(uuid), fOpen(open)
    {
        memset(fName, 0, sizeof(fName));
        snprintf(fName, sizeof(fName), "%s", name);
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fName, sizeof(fName)));
        CheckRes(trans->Read(&fProtocol, sizeof(int)));
        CheckRes(trans->Read(&fOptions, sizeof(int)));
        CheckRes(trans->Read(&fUUID, sizeof(int)));
        return trans->Read(&fOpen, sizeof(int));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fName, sizeof(fName)));
        CheckRes(trans->Write(&fProtocol, sizeof(int)));
        CheckRes(trans->Write(&fOptions, sizeof(int)));
        CheckRes(trans->Write(&fUUID, sizeof(int)));
        return trans->Write(&fOpen, sizeof(int));
    }
    
    int Size() { return sizeof(fName) + 4 * sizeof(int); }

};

/*!
\brief CheckClient result.
*/

struct JackClientCheckResult : public JackResult
{

    char fName[JACK_CLIENT_NAME_SIZE+1];
    int fStatus;

    JackClientCheckResult(): JackResult(), fStatus(0)
    {
        memset(fName, 0, sizeof(fName));
    }
    JackClientCheckResult(int32_t result, const char* name, int status)
            : JackResult(result), fStatus(status)
    {
        memset(fName, 0, sizeof(fName));
        snprintf(fName, sizeof(fName), "%s", name);
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackResult::Read(trans));
        CheckRes(trans->Read(&fName, sizeof(fName)));
        CheckRes(trans->Read(&fStatus, sizeof(int)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackResult::Write(trans));
        CheckRes(trans->Write(&fName, sizeof(fName)));
        CheckRes(trans->Write(&fStatus, sizeof(int)));
        return 0;
    }

};

/*!
\brief NewClient request.
*/

struct JackClientOpenRequest : public JackRequest
{

    int fPID;
    int fUUID;
    char fName[JACK_CLIENT_NAME_SIZE+1];

    JackClientOpenRequest() : fPID(0), fUUID(0)
    {
        memset(fName, 0, sizeof(fName));
    }
    JackClientOpenRequest(const char* name, int pid, int uuid): JackRequest(JackRequest::kClientOpen)
    {
        memset(fName, 0, sizeof(fName));
        snprintf(fName, sizeof(fName), "%s", name);
        fPID = pid;
        fUUID = uuid;
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fPID, sizeof(int)));
        CheckRes(trans->Read(&fUUID, sizeof(int)));
        return trans->Read(&fName, sizeof(fName));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fPID, sizeof(int)));
        CheckRes(trans->Write(&fUUID, sizeof(int)));
        return trans->Write(&fName, sizeof(fName));
    }

    int Size() { return 2 * sizeof(int) + sizeof(fName); }
    
};

/*!
\brief NewClient result.
*/

struct JackClientOpenResult : public JackResult
{

    int fSharedEngine;
    int fSharedClient;
    int fSharedGraph;

    JackClientOpenResult()
            : JackResult(), fSharedEngine(-1), fSharedClient(-1), fSharedGraph(-1)
    {}
    JackClientOpenResult(int32_t result, int index1, int index2, int index3)
            : JackResult(result), fSharedEngine(index1), fSharedClient(index2), fSharedGraph(index3)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackResult::Read(trans));
        CheckRes(trans->Read(&fSharedEngine, sizeof(int)));
        CheckRes(trans->Read(&fSharedClient, sizeof(int)));
        CheckRes(trans->Read(&fSharedGraph, sizeof(int)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackResult::Write(trans));
        CheckRes(trans->Write(&fSharedEngine, sizeof(int)));
        CheckRes(trans->Write(&fSharedClient, sizeof(int)));
        CheckRes(trans->Write(&fSharedGraph, sizeof(int)));
        return 0;
    }

};

/*!
\brief CloseClient request.
*/

struct JackClientCloseRequest : public JackRequest
{

    int fRefNum;

    JackClientCloseRequest() : fRefNum(0)
    {}
    JackClientCloseRequest(int refnum): JackRequest(JackRequest::kClientClose), fRefNum(refnum)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        return trans->Read(&fRefNum, sizeof(int));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        return trans->Write(&fRefNum, sizeof(int));
    }

    int Size() { return sizeof(int); }
};

/*!
\brief Activate request.
*/

struct JackActivateRequest : public JackRequest
{

    int fRefNum;
    int fIsRealTime;

    JackActivateRequest() : fRefNum(0), fIsRealTime(0)
    {}
    JackActivateRequest(int refnum, int is_real_time)
        : JackRequest(JackRequest::kActivateClient), fRefNum(refnum), fIsRealTime(is_real_time)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        return trans->Read(&fIsRealTime, sizeof(int));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        return trans->Write(&fIsRealTime, sizeof(int));
    }

    int Size() { return 2 * sizeof(int); }
};

/*!
\brief Deactivate request.
*/

struct JackDeactivateRequest : public JackRequest
{

    int fRefNum;

    JackDeactivateRequest() : fRefNum(0)
    {}
    JackDeactivateRequest(int refnum): JackRequest(JackRequest::kDeactivateClient), fRefNum(refnum)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        return trans->Read(&fRefNum, sizeof(int));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        return trans->Write(&fRefNum, sizeof(int));
    }

    int Size() { return sizeof(int); }
};

/*!
\brief PortRegister request.
*/

struct JackPortRegisterRequest : public JackRequest
{

    int fRefNum;
    char fName[JACK_PORT_NAME_SIZE + 1];   // port short name
    char fPortType[JACK_PORT_TYPE_SIZE + 1];
    unsigned int fFlags;
    unsigned int fBufferSize;

    JackPortRegisterRequest() : fRefNum(0), fFlags(0), fBufferSize(0)
    {
        memset(fName, 0, sizeof(fName));
        memset(fPortType, 0, sizeof(fPortType));
    }
    JackPortRegisterRequest(int refnum, const char* name, const char* port_type, unsigned int flags, unsigned int buffer_size)
            : JackRequest(JackRequest::kRegisterPort), fRefNum(refnum), fFlags(flags), fBufferSize(buffer_size)
    {
        memset(fName, 0, sizeof(fName));
        memset(fPortType, 0, sizeof(fPortType));
        strncpy(fName, name, sizeof(fName)-1);
        strncpy(fPortType, port_type, sizeof(fPortType)-1);
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fName, sizeof(fName)));
        CheckRes(trans->Read(&fPortType, sizeof(fPortType)));
        CheckRes(trans->Read(&fFlags, sizeof(unsigned int)));
        CheckRes(trans->Read(&fBufferSize, sizeof(unsigned int)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fName, sizeof(fName)));
        CheckRes(trans->Write(&fPortType, sizeof(fPortType)));
        CheckRes(trans->Write(&fFlags, sizeof(unsigned int)));
        CheckRes(trans->Write(&fBufferSize, sizeof(unsigned int)));
        return 0;
    }
    
    int Size() { return sizeof(int) + sizeof(fName) + sizeof(fPortType) + 2 * sizeof(unsigned int); }

};

/*!
\brief PortRegister result.
*/

struct JackPortRegisterResult : public JackResult
{

    jack_port_id_t fPortIndex;

    JackPortRegisterResult(): JackResult(), fPortIndex(NO_PORT)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackResult::Read(trans));
        return trans->Read(&fPortIndex, sizeof(jack_port_id_t));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackResult::Write(trans));
        return trans->Write(&fPortIndex, sizeof(jack_port_id_t));
    }

};

/*!
\brief PortUnregister request.
*/

struct JackPortUnRegisterRequest : public JackRequest
{

    int fRefNum;
    jack_port_id_t fPortIndex;

    JackPortUnRegisterRequest() : fRefNum(0), fPortIndex(0)
    {}
    JackPortUnRegisterRequest(int refnum, jack_port_id_t index)
        : JackRequest(JackRequest::kUnRegisterPort), fRefNum(refnum), fPortIndex(index)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fPortIndex, sizeof(jack_port_id_t)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fPortIndex, sizeof(jack_port_id_t)));
        return 0;
    }

    int Size() { return sizeof(int) + sizeof(jack_port_id_t); }
};

/*!
\brief PortConnectName request.
*/

struct JackPortConnectNameRequest : public JackRequest
{

    int fRefNum;
    char fSrc[REAL_JACK_PORT_NAME_SIZE+1];    // port full name
    char fDst[REAL_JACK_PORT_NAME_SIZE+1];    // port full name

    JackPortConnectNameRequest() : fRefNum(0)
    {
        memset(fSrc, 0, sizeof(fSrc));
        memset(fDst, 0, sizeof(fDst));
    }
    JackPortConnectNameRequest(int refnum, const char* src_name, const char* dst_name)
        : JackRequest(JackRequest::kConnectNamePorts), fRefNum(refnum)
    {
        memset(fSrc, 0, sizeof(fSrc));
        memset(fDst, 0, sizeof(fDst));
        strncpy(fSrc, src_name, sizeof(fSrc)-1);
        strncpy(fDst, dst_name, sizeof(fDst)-1);
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fSrc, sizeof(fSrc)));
        CheckRes(trans->Read(&fDst, sizeof(fDst)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fSrc, sizeof(fSrc)));
        CheckRes(trans->Write(&fDst, sizeof(fDst)));
        return 0;
    }
    
    int Size() { return sizeof(int) + sizeof(fSrc) + sizeof(fDst); }

};

/*!
\brief PortDisconnectName request.
*/

struct JackPortDisconnectNameRequest : public JackRequest
{

    int fRefNum;
    char fSrc[REAL_JACK_PORT_NAME_SIZE+1];    // port full name
    char fDst[REAL_JACK_PORT_NAME_SIZE+1];    // port full name

    JackPortDisconnectNameRequest() : fRefNum(0)
    {
        memset(fSrc, 0, sizeof(fSrc));
        memset(fDst, 0, sizeof(fDst));
    }
    JackPortDisconnectNameRequest(int refnum, const char* src_name, const char* dst_name)
        : JackRequest(JackRequest::kDisconnectNamePorts), fRefNum(refnum)
    {
        memset(fSrc, 0, sizeof(fSrc));
        memset(fDst, 0, sizeof(fDst));
        strncpy(fSrc, src_name, sizeof(fSrc)-1);
        strncpy(fDst, dst_name, sizeof(fDst)-1);
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fSrc, sizeof(fSrc)));
        CheckRes(trans->Read(&fDst, sizeof(fDst)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fSrc, sizeof(fSrc)));
        CheckRes(trans->Write(&fDst, sizeof(fDst)));
        return 0;
    }

    int Size() { return sizeof(int) + sizeof(fSrc) + sizeof(fDst); }
    
};

/*!
\brief PortConnect request.
*/

struct JackPortConnectRequest : public JackRequest
{

    int fRefNum;
    jack_port_id_t fSrc;
    jack_port_id_t fDst;

    JackPortConnectRequest() : fRefNum(0), fSrc(0), fDst(0)
    {}
    JackPortConnectRequest(int refnum, jack_port_id_t src, jack_port_id_t dst)
        : JackRequest(JackRequest::kConnectPorts), fRefNum(refnum), fSrc(src), fDst(dst)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fSrc, sizeof(jack_port_id_t)));
        CheckRes(trans->Read(&fDst, sizeof(jack_port_id_t)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fSrc, sizeof(jack_port_id_t)));
        CheckRes(trans->Write(&fDst, sizeof(jack_port_id_t)));
        return 0;
    }

    int Size() { return sizeof(int) + sizeof(jack_port_id_t) + sizeof(jack_port_id_t); }
};

/*!
\brief PortDisconnect request.
*/

struct JackPortDisconnectRequest : public JackRequest
{

    int fRefNum;
    jack_port_id_t fSrc;
    jack_port_id_t fDst;

    JackPortDisconnectRequest() : fRefNum(0), fSrc(0), fDst(0)
    {}
    JackPortDisconnectRequest(int refnum, jack_port_id_t src, jack_port_id_t dst)
        : JackRequest(JackRequest::kDisconnectPorts), fRefNum(refnum), fSrc(src), fDst(dst)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fSrc, sizeof(jack_port_id_t)));
        CheckRes(trans->Read(&fDst, sizeof(jack_port_id_t)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fSrc, sizeof(jack_port_id_t)));
        CheckRes(trans->Write(&fDst, sizeof(jack_port_id_t)));
        return 0;
    }

    int Size() { return sizeof(int) + sizeof(jack_port_id_t) + sizeof(jack_port_id_t); }
};

/*!
\brief PortRename request.
*/

struct JackPortRenameRequest : public JackRequest
{

    int fRefNum;
    jack_port_id_t fPort;
    char fName[JACK_PORT_NAME_SIZE + 1];   // port short name

    JackPortRenameRequest() : fRefNum(0), fPort(0)
    {
        memset(fName, 0, sizeof(fName));
    }
    JackPortRenameRequest(int refnum, jack_port_id_t port, const char* name)
        : JackRequest(JackRequest::kPortRename), fRefNum(refnum), fPort(port)
    {
        memset(fName, 0, sizeof(fName));
        strncpy(fName, name, sizeof(fName)-1);
    }

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        CheckRes(trans->Read(&fRefNum, sizeof(int)));
        CheckRes(trans->Read(&fPort, sizeof(jack_port_id_t)));
        CheckRes(trans->Read(&fName, sizeof(fName)));
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        CheckRes(trans->Write(&fRefNum, sizeof(int)));
        CheckRes(trans->Write(&fPort, sizeof(jack_port_id_t)));
        CheckRes(trans->Write(&fName, sizeof(fName)));
        return 0;
    }
    
    int Size() { return sizeof(int) + sizeof(jack_port_id_t) + sizeof(fName); }

};

/*!
\brief SetBufferSize request.
*/

struct JackSetBufferSizeRequest : public JackRequest
{

    jack_nframes_t fBufferSize;

    JackSetBufferSizeRequest() : fBufferSize(0)
    {}
    JackSetBufferSizeRequest(jack_nframes_t buffer_size)
        : JackRequest(JackRequest::kSetBufferSize), fBufferSize(buffer_size)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        return trans->Read(&fBufferSize, sizeof(jack_nframes_t));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        return trans->Write(&fBufferSize, sizeof(jack_nframes_t));
    }

    int Size() { return sizeof(jack_nframes_t); }
};

/*!
\brief SetFreeWheel request.
*/

struct JackSetFreeWheelRequest : public JackRequest
{

    int fOnOff;

    JackSetFreeWheelRequest() : fOnOff(0)
    {}
    JackSetFreeWheelRequest(int onoff)
        : JackRequest(JackRequest::kSetFreeWheel), fOnOff(onoff)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        return trans->Read(&fOnOff, sizeof(int));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        return trans->Write(&fOnOff, sizeof(int));
    }
    
    int Size() { return sizeof(int); }

};

/*!
\brief ComputeTotalLatencies request.
*/

struct JackComputeTotalLatenciesRequest : public JackRequest
{

    JackComputeTotalLatenciesRequest()
        : JackRequest(JackRequest::kComputeTotalLatencies)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        return 0;
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {
        CheckRes(JackRequest::Write(trans, Size()));
        return 0;
    }

    int Size() { return 0; }
};

/*!
\brief ReleaseTimebase request.
*/

struct JackReleaseTimebaseRequest : public JackRequest
{

    int fRefNum;

    JackReleaseTimebaseRequest() : fRefNum(0)
    {}
    JackReleaseTimebaseRequest(int refnum)
        : JackRequest(JackRequest::kReleaseTimebase), fRefNum(refnum)
    {}

    int Read(detail::JackChannelTransactionInterface* trans)
    {
        CheckSize();
        return trans->Read(&fRefNum, sizeof(int));
    }

    int Write(detail::JackChannelTransactionInterface* trans)
    {