/usr/include/audio/snd.h is in libaudio-dev 1.9.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* <audio/snd.h>
*
* This file contains interfaces to the .snd files. It is not dependent on the
* NCD-AUDIO service and can easily be used for other purposes.
*
* Copyright 1993 Network Computing Devices, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name Network Computing Devices, Inc. not be
* used in advertising or publicity pertaining to distribution of this
* software without specific, written prior permission.
*
* THIS SOFTWARE IS PROVIDED 'AS-IS'. NETWORK COMPUTING DEVICES, INC.,
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT
* LIMITATION ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NONINFRINGEMENT. IN NO EVENT SHALL NETWORK
* COMPUTING DEVICES, INC., BE LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING
* SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF USE, DATA,
* OR PROFITS, EVEN IF ADVISED OF THE POSSIBILITY THEREOF, AND REGARDLESS OF
* WHETHER IN AN ACTION IN CONTRACT, TORT OR NEGLIGENCE, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $NCDId: @(#)snd.h,v 1.13 1995/05/23 23:37:12 greg Exp $
*/
#ifndef _SND_H_
#define _SND_H_
#include <stdio.h>
#include <audio/audio.h> /* for AuInt32 and AuUint32 */
#ifndef _SndConst
#define _SndConst const
#endif /* _SndConst */
#ifndef _FUNCPROTOBEGIN
#ifdef __cplusplus /* for C++ V2.0 */
#define _FUNCPROTOBEGIN extern "C" { /* do not leave open across includes */
#define _FUNCPROTOEND }
#else
#define _FUNCPROTOBEGIN
#define _FUNCPROTOEND
#endif
#endif /* _FUNCPROTOBEGIN */
/*****************************************************************************
* DATA TYPES *
*****************************************************************************/
#define SND_MAGIC_NUM 0x2e736e64 /* .snd */
#define SND_DATA_SIZE_UNKNOWN 0xffffffff
#define SND_FORMAT_UNSPECIFIED 0
#define SND_FORMAT_ULAW_8 1
#define SND_FORMAT_LINEAR_8 2
#define SND_FORMAT_LINEAR_16 3
#define SND_FORMAT_LINEAR_24 4
#define SND_FORMAT_LINEAR_32 5
#define SND_FORMAT_FLOAT_32 6
#define SND_FORMAT_FLOAT_64 7
#define SND_FORMAT_ULAW_COMPRESSED_8 23
typedef struct _SndHeader
{
AuUint32 magic; /* the value 0x2e736e64
* (ASCII ".snd") */
AuUint32 dataOffset; /* the offset, in octets, to
* the data part. The minimum
* valid number is 24
* (decimal). */
AuUint32 dataSize; /* the size in octets, of the
* data part. If unknown, the
* value 0xffffffff should be
* used. */
/** the data format:
*
* value format
* 1 8-bit ISDN u-law
* 2 8-bit linear PCM [REF-PCM]
* 3 16-bit linear PCM
* 4 24-bit linear PCM
* 5 32-bit linear PCM
* 6 32-bit IEEE floating point
* 7 64-bit IEEE floating point
* 23 8-bit ISDN u-law compressed
* using the CCITT G.721 ADPCM
* voice data format scheme.
*/
AuUint32 format;
AuUint32 sampleRate; /* the number of
* samples/second (e.g.,
* 8000) */
AuUint32 tracks; /* the number of interleaved
* tracks (e.g., 1) */
} SndHeader;
typedef struct
{
SndHeader h;
char *comment;
FILE *fp;
int writing;
} SndInfo;
/*****************************************************************************
* PUBLIC INTERFACES *
*****************************************************************************/
_FUNCPROTOBEGIN
extern SndInfo *
SndOpenFileForReading(
const char * /* file name */
);
extern SndInfo *
SndOpenFileForWriting(
const char *, /* file name */
SndInfo * /* info */
);
extern int
SndCloseFile(
SndInfo * /* info */
);
extern int
SndReadFile(
char *, /* buffer */
int, /* num bytes */
SndInfo * /* info */
);
extern int
SndWriteFile(
char *, /* buffer */
int, /* num bytes */
SndInfo * /* info */
);
extern int
SndSeekFile(
int, /* number of audio bytes */
SndInfo * /* info */
);
extern int
SndTellFile(
SndInfo * /* info */
);
extern int
SndFlushFile(
SndInfo * /* info */
);
extern int
SndRewindFile(
SndInfo * /* info */
);
_FUNCPROTOEND
#endif /* _SND_H_ */
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