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
		{snd_pcm_status_alloca(&status);}
	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_)