/usr/include/sndio.h is in libsndio-dev 1.1.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef SNDIO_H
#define SNDIO_H
#include <sys/types.h>
/*
* default audio device and MIDI port
*/
#define SIO_DEVANY "default"
#define MIO_PORTANY "default"
/*
* private ``handle'' structure
*/
struct sio_hdl;
struct mio_hdl;
/*
* parameters of a full-duplex stream
*/
struct sio_par {
unsigned int bits; /* bits per sample */
unsigned int bps; /* bytes per sample */
unsigned int sig; /* 1 = signed, 0 = unsigned */
unsigned int le; /* 1 = LE, 0 = BE byte order */
unsigned int msb; /* 1 = MSB, 0 = LSB aligned */
unsigned int rchan; /* number channels for recording direction */
unsigned int pchan; /* number channels for playback direction */
unsigned int rate; /* frames per second */
unsigned int bufsz; /* end-to-end buffer size */
#define SIO_IGNORE 0 /* pause during xrun */
#define SIO_SYNC 1 /* resync after xrun */
#define SIO_ERROR 2 /* terminate on xrun */
unsigned int xrun; /* what to do on overruns/underruns */
unsigned int round; /* optimal bufsz divisor */
unsigned int appbufsz; /* minimum buffer size */
int __pad[3]; /* for future use */
unsigned int __magic; /* for internal/debug purposes only */
};
/*
* capabilities of a stream
*/
struct sio_cap {
#define SIO_NENC 8
#define SIO_NCHAN 8
#define SIO_NRATE 16
#define SIO_NCONF 4
struct sio_enc { /* allowed sample encodings */
unsigned int bits;
unsigned int bps;
unsigned int sig;
unsigned int le;
unsigned int msb;
} enc[SIO_NENC];
unsigned int rchan[SIO_NCHAN]; /* allowed values for rchan */
unsigned int pchan[SIO_NCHAN]; /* allowed values for pchan */
unsigned int rate[SIO_NRATE]; /* allowed rates */
int __pad[7]; /* for future use */
unsigned int nconf; /* number of elements in confs[] */
struct sio_conf {
unsigned int enc; /* mask of enc[] indexes */
unsigned int rchan; /* mask of chan[] indexes (rec) */
unsigned int pchan; /* mask of chan[] indexes (play) */
unsigned int rate; /* mask of rate[] indexes */
} confs[SIO_NCONF];
};
#define SIO_XSTRINGS { "ignore", "sync", "error" }
/*
* mode bitmap
*/
#define SIO_PLAY 1
#define SIO_REC 2
#define MIO_OUT 4
#define MIO_IN 8
/*
* default bytes per sample for the given bits per sample
*/
#define SIO_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))
/*
* default value of "sio_par->le" flag
*/
#if BYTE_ORDER == LITTLE_ENDIAN
#define SIO_LE_NATIVE 1
#else
#define SIO_LE_NATIVE 0
#endif
/*
* maximum value of volume, eg. for sio_setvol()
*/
#define SIO_MAXVOL 127
#ifdef __cplusplus
extern "C" {
#endif
struct pollfd;
void sio_initpar(struct sio_par *);
struct sio_hdl *sio_open(const char *, unsigned int, int);
void sio_close(struct sio_hdl *);
int sio_setpar(struct sio_hdl *, struct sio_par *);
int sio_getpar(struct sio_hdl *, struct sio_par *);
int sio_getcap(struct sio_hdl *, struct sio_cap *);
void sio_onmove(struct sio_hdl *, void (*)(void *, int), void *);
size_t sio_write(struct sio_hdl *, const void *, size_t);
size_t sio_read(struct sio_hdl *, void *, size_t);
int sio_start(struct sio_hdl *);
int sio_stop(struct sio_hdl *);
int sio_nfds(struct sio_hdl *);
int sio_pollfd(struct sio_hdl *, struct pollfd *, int);
int sio_revents(struct sio_hdl *, struct pollfd *);
int sio_eof(struct sio_hdl *);
int sio_setvol(struct sio_hdl *, unsigned int);
int sio_onvol(struct sio_hdl *, void (*)(void *, unsigned int), void *);
struct mio_hdl *mio_open(const char *, unsigned int, int);
void mio_close(struct mio_hdl *);
size_t mio_write(struct mio_hdl *, const void *, size_t);
size_t mio_read(struct mio_hdl *, void *, size_t);
int mio_nfds(struct mio_hdl *);
int mio_pollfd(struct mio_hdl *, struct pollfd *, int);
int mio_revents(struct mio_hdl *, struct pollfd *);
int mio_eof(struct mio_hdl *);
#ifdef __cplusplus
}
#endif
#endif /* !defined(SNDIO_H) */
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