jamulus/linux/sound.h

/******************************************************************************\
 * Copyright (c) 2004-2019
 *
 * Author(s):
 *  Volker Fischer
 *
 ******************************************************************************
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU 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
 *
\******************************************************************************/

#pragma once

#ifndef JACK_REPLACES_ASIO // these headers are not available in Windows OS
# include <unistd.h>
# include <sys/ioctl.h>
#endif
#include <fcntl.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <QThread>
#include <string.h>
#include "util.h"
#include "soundbase.h"
#include "global.h"

#if WITH_SOUND
# include <jack/jack.h>
#endif


/* Definitions ****************************************************************/
#define NUM_IN_OUT_CHANNELS         2 // always stereo

// the number of periods is critical for latency
#define NUM_PERIOD_BLOCKS_IN        2
#define NUM_PERIOD_BLOCKS_OUT       1

#define MAX_SND_BUF_IN              200
#define MAX_SND_BUF_OUT             200


/* Classes ********************************************************************/
#if WITH_SOUND
class CSound : public CSoundBase
{
public:
    CSound ( void      (*fpNewProcessCallback) ( CVector<short>& psData, void* arg ),
             void*     arg,
             const int iCtrlMIDIChannel ) :
        CSoundBase ( "Jack", true, fpNewProcessCallback, arg, iCtrlMIDIChannel ), iJACKBufferSizeMono ( 0 ),
        iJACKBufferSizeStero ( 0 ) { OpenJack(); }
    virtual ~CSound() { CloseJack(); }

    virtual int  Init ( const int iNewPrefMonoBufferSize );
    virtual void Start();
    virtual void Stop();

    // these variables should be protected but cannot since we want
    // to access them from the callback function
    CVector<short> vecsTmpAudioSndCrdStereo;
    int            iJACKBufferSizeMono;
    int            iJACKBufferSizeStero;

    jack_port_t*   input_port_left;
    jack_port_t*   input_port_right;
    jack_port_t*   output_port_left;
    jack_port_t*   output_port_right;

protected:
    void OpenJack();
    void CloseJack();

    // callbacks
    static int     process ( jack_nframes_t nframes, void* arg );
    static int     bufferSizeCallback ( jack_nframes_t, void *arg );
    static void    shutdownCallback ( void* );
    jack_client_t* pJackClient;
};
#else
// no sound -> dummy class definition
class CSound : public CSoundBase
{
public:
    CSound ( void      (*fpNewProcessCallback) ( CVector<short>& psData, void* pParg ),
             void*     pParg,
             const int iCtrlMIDIChannel ) :
        CSoundBase ( "nosound", false, fpNewProcessCallback, pParg, iCtrlMIDIChannel ) {}
    virtual ~CSound() {}
};
#endif // WITH_SOUND