This should fix excessive latency with the RayDay that has a fixed buffersize of 16384 samples.
193 lines
6.0 KiB
C++
193 lines
6.0 KiB
C++
// ----------------------------------------------------------------------------
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//
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// Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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#ifndef _ZITA_ALSA_PCMI_H_
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#define _ZITA_ALSA_PCMI_H_
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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#include <alsa/asoundlib.h>
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#define ZITA_ALSA_PCMI_MAJOR_VERSION 0
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#define ZITA_ALSA_PCMI_MINOR_VERSION 2
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#include <stdint.h>
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extern int zita_alsa_pcmi_major_version (void);
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extern int zita_alsa_pcmi_minor_version (void);
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class Alsa_pcmi
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{
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public:
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Alsa_pcmi (
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const char *play_name,
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const char *capt_name,
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const char *ctrl_name,
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unsigned int rate,
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unsigned int frsize,
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unsigned int play_nfrags,
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unsigned int capt_nfrags,
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unsigned int debug = 0);
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~Alsa_pcmi (void);
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enum
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{
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DEBUG_INIT = 1,
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DEBUG_STAT = 2,
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DEBUG_WAIT = 4,
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DEBUG_DATA = 8,
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DEBUG_ALL = 15,
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FORCE_16B = 256,
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FORCE_2CH = 512
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};
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void printinfo (void);
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int pcm_start (void);
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int pcm_stop (void);
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snd_pcm_sframes_t pcm_wait (void);
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int pcm_idle (int len);
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int play_init (snd_pcm_uframes_t len);
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void clear_chan (int chan, int len);
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void play_chan (int chan, const float *src, int len, int step = 1);
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int play_done (int len);
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int capt_init (snd_pcm_uframes_t len);
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void capt_chan (int chan, float *dst, int len, int step = 1);
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int capt_done (int len);
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int play_avail (void)
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{
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return snd_pcm_avail (_play_handle);
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}
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int capt_avail (void)
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{
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return snd_pcm_avail (_capt_handle);
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}
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int play_delay (void)
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{
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long k;
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snd_pcm_delay (_play_handle, &k);
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return k;
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}
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int capt_delay (void)
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{
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long k;
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snd_pcm_delay (_capt_handle, &k);
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return k;
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}
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float play_xrun (void) const { return _play_xrun; }
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float capt_xrun (void) const { return _capt_xrun; }
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int state (void) const { return _state; }
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size_t fsize (void) const { return _fsize; }
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uint32_t fsamp (void) const { return _fsamp; }
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uint32_t play_nfrag (void) const { return _play_nfrag; }
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uint32_t capt_nfrag (void) const { return _capt_nfrag; }
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uint32_t nplay (void) const { return _play_nchan; }
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uint32_t ncapt (void) const { return _capt_nchan; }
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snd_pcm_t *play_handle (void) const { return _play_handle; }
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snd_pcm_t *capt_handle (void) const { return _capt_handle; }
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private:
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typedef char *(Alsa_pcmi::*clear_function)(char *, int);
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typedef char *(Alsa_pcmi::*play_function)(const float *, char *, int, int);
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typedef const char *(Alsa_pcmi::*capt_function) (const char *, float *, int, int);
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enum { MAXPFD = 16, MAXCHAN = 128 };
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void initialise (const char *play_name, const char *capt_name, const char *ctrl_name);
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int set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int nfrag, unsigned int *nchan);
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int set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname);
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int recover (void);
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float xruncheck (snd_pcm_status_t *stat);
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char *clear_32 (char *dst, int nfrm);
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char *clear_24 (char *dst, int nfrm);
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char *clear_16 (char *dst, int nfrm);
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char *play_float (const float *src, char *dst, int nfrm, int step);
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char *play_32 (const float *src, char *dst, int nfrm, int step);
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char *play_24 (const float *src, char *dst, int nfrm, int step);
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char *play_16 (const float *src, char *dst, int nfrm, int step);
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char *play_32swap (const float *src, char *dst, int nfrm, int step);
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char *play_24swap (const float *src, char *dst, int nfrm, int step);
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char *play_16swap (const float *src, char *dst, int nfrm, int step);
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const char *capt_float (const char *src, float *dst, int nfrm, int step);
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const char *capt_32 (const char *src, float *dst, int nfrm, int step);
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const char *capt_24 (const char *src, float *dst, int nfrm, int step);
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const char *capt_16 (const char *src, float *dst, int nfrm, int step);
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const char *capt_32swap (const char *src, float *dst, int nfrm, int step);
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const char *capt_24swap (const char *src, float *dst, int nfrm, int step);
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const char *capt_16swap (const char *src, float *dst, int nfrm, int step);
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unsigned int _fsamp;
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snd_pcm_uframes_t _fsize;
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unsigned int _play_nfrag;
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unsigned int _real_nfrag;
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unsigned int _capt_nfrag;
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unsigned int _debug;
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int _state;
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snd_pcm_t *_play_handle;
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snd_pcm_t *_capt_handle;
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snd_ctl_t *_ctrl_handle;
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snd_pcm_hw_params_t *_play_hwpar;
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snd_pcm_sw_params_t *_play_swpar;
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snd_pcm_hw_params_t *_capt_hwpar;
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snd_pcm_sw_params_t *_capt_swpar;
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snd_pcm_format_t _play_format;
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snd_pcm_format_t _capt_format;
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snd_pcm_access_t _play_access;
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snd_pcm_access_t _capt_access;
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unsigned int _play_nchan;
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unsigned int _capt_nchan;
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float _play_xrun;
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float _capt_xrun;
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bool _synced;
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int _play_npfd;
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int _capt_npfd;
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struct pollfd _poll_fd [MAXPFD];
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snd_pcm_uframes_t _capt_offs;
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snd_pcm_uframes_t _play_offs;
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int _play_step;
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int _capt_step;
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char *_play_ptr [MAXCHAN];
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const char *_capt_ptr [MAXCHAN];
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clear_function _clear_func;
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play_function _play_func;
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capt_function _capt_func;
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void *_dummy [16];
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};
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#endif
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