13
0
livetrax/libs/backends/alsa/zita-alsa-pcmi.h

184 lines
5.7 KiB
C
Raw Normal View History

/*
* Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
* Copyright (C) 2014-2021 Robin Gareus <robin@gareus.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
2021-05-15 17:09:21 -04:00
#include <alsa/asoundlib.h>
#include <stdint.h>
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 play_nfrags,
unsigned int capt_nfrags,
unsigned int debug = 0);
~Alsa_pcmi (void);
enum {
DEBUG_INIT = 0x001,
DEBUG_STAT = 0x002,
DEBUG_WAIT = 0x004,
DEBUG_DATA = 0x008,
DEBUG_ALL = 0x00f, // 15
FORCE_16B = 0x100, // 256,
FORCE_2CH = 0x200, // 512
TRY_INTLVD = 0x400, // 1024
};
void printinfo (void);
int pcm_start (void);
int pcm_stop (void);
int pcm_idle (int len);
snd_pcm_sframes_t pcm_wait (void);
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 play_nfrag (void) const { return _play_nfrag; }
uint32_t capt_nfrag (void) const { return _capt_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 = 128 };
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 nfrag, 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 _play_nfrag;
unsigned int _real_nfrag;
unsigned int _capt_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