livetrax/libs/backends/alsa/zita-alsa-pcmi.h

// ----------------------------------------------------------------------------
//
//  Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
//
//  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 3 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, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------


#ifndef _ZITA_ALSA_PCMI_H_
#define _ZITA_ALSA_PCMI_H_


#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API
#include <alsa/asoundlib.h>


#define ZITA_ALSA_PCMI_MAJOR_VERSION 0
#define ZITA_ALSA_PCMI_MINOR_VERSION 2

#include <stdint.h>

extern int zita_alsa_pcmi_major_version (void);
extern int zita_alsa_pcmi_minor_version (void);


class Alsa_pcmi
{
public:

	Alsa_pcmi (
			const char   *play_name,
			const char   *capt_name,
			const char   *ctrl_name,
			unsigned int  rate,
			unsigned int  frsize,
			unsigned int  nfrags,
			unsigned int  debug = 0);

	~Alsa_pcmi (void);

	enum
	{
		DEBUG_INIT = 1,
		DEBUG_STAT = 2,
		DEBUG_WAIT = 4,
		DEBUG_DATA = 8,
		DEBUG_ALL  = 15,
		FORCE_16B  = 256,
		FORCE_2CH  = 512
	};

	void printinfo (void);

	int pcm_start (void);
	int pcm_stop (void);
	snd_pcm_sframes_t pcm_wait (void);
	int pcm_idle (int len);

	int play_init (snd_pcm_uframes_t len);
	void clear_chan (int chan, int len);
	void play_chan (int chan, const float *src, int len, int step = 1);
	int play_done (int len);

	int capt_init (snd_pcm_uframes_t len);
	void capt_chan (int chan, float *dst, int len, int step = 1);
	int capt_done (int len);

	int play_avail (void)
	{
		return snd_pcm_avail (_play_handle);
	}

	int capt_avail (void)
	{
		return snd_pcm_avail (_capt_handle);
	}

	int play_delay (void)
	{
		long k;
		snd_pcm_delay (_play_handle, &k);
		return k;
	}

	int capt_delay (void)
	{
		long k;
		snd_pcm_delay (_capt_handle, &k);
		return k;
	}

	float play_xrun (void) const { return _play_xrun; }
	float capt_xrun (void) const { return _capt_xrun; }

	int      state (void) const { return _state; }
	size_t   fsize (void) const { return _fsize; }
	uint32_t fsamp (void) const { return _fsamp; }
	uint32_t nfrag (void) const { return _nfrag; }
	uint32_t nplay (void) const { return _play_nchan; }
	uint32_t ncapt (void) const { return _capt_nchan; }
	snd_pcm_t *play_handle (void) const { return _play_handle; }
	snd_pcm_t *capt_handle (void) const { return _capt_handle; }


private:

	typedef char *(Alsa_pcmi::*clear_function)(char *, int);
	typedef char *(Alsa_pcmi::*play_function)(const float *, char *, int, int);
	typedef const char *(Alsa_pcmi::*capt_function) (const char *, float *, int, int);

	enum { MAXPFD = 16, MAXCHAN = 64 };

	void initialise (const char *play_name, const char *capt_name, const char *ctrl_name);
	int set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan);
	int set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname);
	int recover (void);
	float xruncheck (snd_pcm_status_t *stat);

	char *clear_32 (char *dst, int nfrm);
	char *clear_24 (char *dst, int nfrm);
	char *clear_16 (char *dst, int nfrm);

	char *play_float (const float *src, char *dst, int nfrm, int step);
	char *play_32 (const float *src, char *dst, int nfrm, int step);
	char *play_24 (const float *src, char *dst, int nfrm, int step);
	char *play_16 (const float *src, char *dst, int nfrm, int step);
	char *play_32swap (const float *src, char *dst, int nfrm, int step);
	char *play_24swap (const float *src, char *dst, int nfrm, int step);
	char *play_16swap (const float *src, char *dst, int nfrm, int step);

	const char *capt_float (const char *src, float *dst, int nfrm, int step);
	const char *capt_32 (const char *src, float *dst, int nfrm, int step);
	const char *capt_24 (const char *src, float *dst, int nfrm, int step);
	const char *capt_16 (const char *src, float *dst, int nfrm, int step);
	const char *capt_32swap (const char *src, float *dst, int nfrm, int step);
	const char *capt_24swap (const char *src, float *dst, int nfrm, int step);
	const char *capt_16swap (const char *src, float *dst, int nfrm, int step);

	unsigned int           _fsamp;
	snd_pcm_uframes_t      _fsize;
	unsigned int           _nfrag;
	unsigned int           _debug;
	int                    _state;
	snd_pcm_t             *_play_handle;
	snd_pcm_t             *_capt_handle;
	snd_ctl_t             *_ctrl_handle;
	snd_pcm_hw_params_t   *_play_hwpar;
	snd_pcm_sw_params_t   *_play_swpar;
	snd_pcm_hw_params_t   *_capt_hwpar;
	snd_pcm_sw_params_t   *_capt_swpar;
	snd_pcm_format_t       _play_format;
	snd_pcm_format_t       _capt_format;
	snd_pcm_access_t       _play_access;
	snd_pcm_access_t       _capt_access;
	unsigned int           _play_nchan;
	unsigned int           _capt_nchan;
	float                  _play_xrun;
	float                  _capt_xrun;
	bool                   _synced;
	int                    _play_npfd;
	int                    _capt_npfd;
	struct pollfd          _poll_fd [MAXPFD];
	snd_pcm_uframes_t      _capt_offs;
	snd_pcm_uframes_t      _play_offs;
	int                    _play_step;
	int                    _capt_step;
	char                  *_play_ptr [MAXCHAN];
	const char            *_capt_ptr [MAXCHAN];
	clear_function         _clear_func;
	play_function          _play_func;
	capt_function          _capt_func;
	void                  *_dummy [16];
};

#endif