jamulus/linux/sound.h

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/******************************************************************************\
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* Copyright (c) 2004-2008
*
* 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 ( const int iNewBufferSizeStereo )
#if WITH_SOUND
: rhandle ( NULL ), phandle ( NULL ), iCurPeriodSizeIn ( NUM_PERIOD_BLOCKS_IN ),
iCurPeriodSizeOut ( NUM_PERIOD_BLOCKS_OUT ), bChangParamIn ( true ),
bChangParamOut ( true )
#endif
{
// set internal buffer size for read and write
iBufferSizeIn = iNewBufferSizeStereo / NUM_IN_OUT_CHANNELS; // mono size
iBufferSizeOut = iNewBufferSizeStereo / NUM_IN_OUT_CHANNELS; // mono size
}
virtual ~CSound() { Close(); }
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// not implemented yet, always return one device and default string
int GetNumDev() { return 1; }
std::string GetDeviceName ( const int iDiD ) { return "wave mapper"; }
int SetDev ( const int iNewDev ) {} // dummy
int GetDev() { return 0; }
#if WITH_SOUND
void SetInNumBuf ( int iNewNum );
int GetInNumBuf() { return iCurPeriodSizeIn; }
void SetOutNumBuf ( int iNewNum );
int GetOutNumBuf() { return iCurPeriodSizeOut; }
void InitRecording ( const bool bNewBlocking = true );
void InitPlayback ( const 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 ( const bool bNewBlocking = true ) { printf ( "no sound!" ); }
void InitPlayback ( const 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_)