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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _AUDIO_AU_H
#define _AUDIO_AU_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/isa_defs.h>
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Define an on-disk audio file header for the AU file format.
*
* Note that there is an optional 'info' field that immediately follows this
* structure in the file. It is an optional length field that is sometimes
* used to store additional information. At the minimum, it is at
* least 4 bytes.
*
* The offset field is problematic in the general case because the
* field is really "data location", which does not ensure that all
* the bytes between the header and the data are really 'info'.
* Further, there are no absolute guarantees that the info is ASCII text.
*
* When audio files are passed through pipes, the au_data_size field may
* not be known in advance. In such cases, au_data_size should be
* set to AUDIO_AU_UNKNOWN_SIZE.
*/
struct au_filehdr {
uint32_t au_magic; /* magic number */
uint32_t au_offset; /* size of this header */
uint32_t au_data_size; /* length of data */
uint32_t au_encoding; /* data encoding format */
uint32_t au_sample_rate; /* samples per second */
uint32_t au_channels; /* number of interleaved channels */
};
typedef struct au_filehdr au_filehdr_t;
/*
* This is the appearance of a typical AU audio file as described
* by this structure.
*
* ------------------------------------------------------------
* | | | |
* | AU Audio Header | Info | Audio Data |
* | | (optional) | |
* | | | |
* | 24 bytes | 4 bytes (min) | n bytes |
* | | | |
* ------------------------------------------------------------
*/
/* Define the magic number */
#define AUDIO_AU_FILE_MAGIC ((uint32_t)0x2e736e64) /* ".snd" */
/* Unknown header size */
#define AUDIO_AU_UNKNOWN_SIZE ((unsigned)(~0)) /* (unsigned) -1 */
/* Define the AU encoding fields */
#define AUDIO_AU_ENCODING_ULAW (1) /* 8-bit u-law */
#define AUDIO_AU_ENCODING_LINEAR_8 (2) /* 8-bit linear PCM */
#define AUDIO_AU_ENCODING_LINEAR_16 (3) /* 16-bit linear PCM */
#define AUDIO_AU_ENCODING_LINEAR_24 (4) /* 24-bit linear PCM */
#define AUDIO_AU_ENCODING_LINEAR_32 (5) /* 32-bit linear PCM */
#define AUDIO_AU_ENCODING_FLOAT (6) /* 32-bit IEEE floating point */
#define AUDIO_AU_ENCODING_DOUBLE (7) /* 64-bit IEEE double */
/* precision float */
#define AUDIO_AU_ENCODING_FRAGMENTED (8) /* Fragmented sample data */
#define AUDIO_AU_ENCODING_DSP (10) /* DSP program */
#define AUDIO_AU_ENCODING_FIXED_8 (11) /* 8-bit fixed point */
#define AUDIO_AU_ENCODING_FIXED_16 (12) /* 16-bit fixed point */
#define AUDIO_AU_ENCODING_FIXED_24 (13) /* 24-bit fixed point */
#define AUDIO_AU_ENCODING_FIXED_32 (14) /* 32-bit fixed point */
#define AUDIO_AU_ENCODING_EMPHASIS (18) /* 16-bit linear with */
/* emphasis */
#define AUDIO_AU_ENCODING_COMPRESSED (19) /* 16-bit linear compressed */
#define AUDIO_AU_ENCODING_EMP_COMP (20) /* 16-bit linear with */
/* emphasis and compression */
#define AUDIO_AU_ENCODING_MUSIC_KIT (21) /* Music kit DSP commands */
#define AUDIO_AU_ENCODING_ADPCM_G721 (23) /* 4-bit CCITT G.721 ADPCM */
#define AUDIO_AU_ENCODING_ADPCM_G722 (24) /* CCITT G.722 ADPCM */
#define AUDIO_AU_ENCODING_ADPCM_G723_3 (25) /* CCITT G.723.3 ADPCM */
#define AUDIO_AU_ENCODING_ADPCM_G723_5 (26) /* CCITT G.723.5 ADPCM */
#define AUDIO_AU_ENCODING_ALAW (27) /* 8-bit A-law G.711 */
/* Byte swapping routines */
#if defined(_BIG_ENDIAN)
#define AUDIO_AU_FILE2HOST(from, to) *((long *)(to)) = *((long *)(from))
#else
#define AUDIO_AU_FILE2HOST(from, to) \
((char *)(to))[0] = ((char *)(from))[3]; \
((char *)(to))[1] = ((char *)(from))[2]; \
((char *)(to))[2] = ((char *)(from))[1]; \
((char *)(to))[3] = ((char *)(from))[0];
#endif /* byte swapping */
#if defined(__sparc) || defined(__i386) || defined(__amd64)
#define AUDIO_AU_HOST2FILE(from, to) AUDIO_AU_FILE2HOST((from), (to))
#else
#error unknown machine type;
#endif /* encode */
#ifdef __cplusplus
}
#endif
#endif /* _AUDIO_AU_H */
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