jamulus/linux/sound.h

/******************************************************************************\
 * Copyright (c) 2004-2005
 *
 * Author(s):
 *  Volker Fischer, Alexander Kurpiers
 *
 * This code is based on the Open-Source sound interface implementation of
 * the Dream DRM Receiver project.
 *
\******************************************************************************/

#if !defined(_SOUND_H__9518A621345F78_3634567_8C0D_EEBF182CF549__INCLUDED_)
#define _SOUND_H__9518A621345F78_3634567_8C0D_EEBF182CF549__INCLUDED_

#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>

#include <string.h>
#include "util.h"
#include "global.h"

#if WITH_SOUND
# define ALSA_PCM_NEW_HW_PARAMS_API
# define ALSA_PCM_NEW_SW_PARAMS_API
# include <alsa/asoundlib.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       2

#define MAX_SND_BUF_IN              200
#define MAX_SND_BUF_OUT             200

/* Classes ********************************************************************/
class CSound
{
public:
    CSound()
#if WITH_SOUND
    : rhandle(NULL), phandle(NULL), iCurPeriodSizeIn(NUM_PERIOD_BLOCKS_IN),
    iCurPeriodSizeOut(NUM_PERIOD_BLOCKS_OUT), bChangParamIn(true),
    bChangParamOut(true)
#endif
        {}
    virtual ~CSound() {Close();}

    /* Not implemented yet, always return one device and default string */
    int     GetNumDev() {return 1;}
    void    SetOutDev(int iNewDev) {}
    void    SetInDev(int iNewDev) {}

    /* Return invalid device ID which is the same as using "wave mapper" which
       we assume here to be used */
    int     GetOutDev() {return 1;}
    int     GetInDev() {return 1;}

#if WITH_SOUND
    void    SetInNumBuf(int iNewNum);
    int     GetInNumBuf() {return iCurPeriodSizeIn;}
    void    SetOutNumBuf(int iNewNum);
    int     GetOutNumBuf() {return iCurPeriodSizeOut;}
    void    InitRecording(int iNewBufferSize, bool bNewBlocking = true);
    void    InitPlayback(int iNewBufferSize, bool bNewBlocking = false);
    bool    Read(CVector<short>& psData);
    bool    Write(CVector<short>& psData);

    void    Close();
    
protected:
    snd_pcm_t* rhandle;
    snd_pcm_t* phandle;

    bool SetHWParams(snd_pcm_t* handle, const int iBufferSizeIn,
                     const int iNumPeriodBlocks);

    int iBufferSizeOut;
    int iBufferSizeIn;
    bool bChangParamIn;
    int iCurPeriodSizeIn;
    bool bChangParamOut;
    int iCurPeriodSizeOut;
#else
    /* Dummy definitions */
    void    SetInNumBuf(int iNewNum) {}
    int     GetInNumBuf() {return 1;}
    void    SetOutNumBuf(int iNewNum) {}
    int     GetOutNumBuf() {return 1;}
    void    InitRecording(int iNewBufferSize, bool bNewBlocking = true) {printf("no sound!");}
    void    InitPlayback(int iNewBufferSize, bool bNewBlocking = false) {printf("no sound!");}
    bool    Read(CVector<short>& psData) {printf("no sound!"); return false;}
    bool    Write(CVector<short>& psData) {printf("no sound!"); return false;}
    void    Close() {}
#endif
};


#endif // !defined(_SOUND_H__9518A621345F78_3634567_8C0D_EEBF182CF549__INCLUDED_)