audio/common/libaudio.h

/*	$NetBSD: libaudio.h,v 1.18 2013/08/30 20:57:26 mrg Exp $	*/

/*
 * Copyright (c) 1999, 2009 Matthew R. Green
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * audio formats
 */
#define AUDIO_FORMAT_DEFAULT	-1
#define AUDIO_FORMAT_NONE	1
#define AUDIO_FORMAT_SUN	2
#define AUDIO_FORMAT_WAV	3

int	audio_format_from_str (char *);

/*
 * We copy the Sun/NeXT on-disk audio header format and document what
 * we know of it here.
 *
 * The header size appears to be an offset to where the data really
 * begins, rather than defining the real length of the audio header.
 * The Sun/NeXT audio format seems to only use 24 bytes of data (with
 * an additional 8 bytes of nuls written, padding it to 32 bytes).
 *
 * If the size of the audio data is unknown (eg, reading from a pipe)
 * the Sun demo audio tools place AUDIO_UNKNOWN_SIZE in the
 * `data_size' member.
 *
 * For stereo data, the channels appear to be interleaved with the
 * left channel first.  For more channels, who knows?
 */

/*
 * This is the Sun/NeXT audio file magic value.  Note that it
 * is also `.snd' in ASCII.
 */
#define	AUDIO_FILE_MAGIC		((u_int32_t)0x2e736e64)
#define AUDIO_UNKNOWN_SIZE		((unsigned)(~0))

typedef struct {
	u_int32_t	magic;
	u_int32_t	hdr_size;	/* header size; in bytes */
	u_int32_t	data_size;	/* optional; in bytes */
	u_int32_t	encoding;	/* see below */
	u_int32_t	sample_rate;	/* per second */
	u_int32_t	channels;	/* number of interleaved channels */
} sun_audioheader;

#define Audio_filehdr sun_audioheader	/* SunOS compat(?) */

/*
 * these are the types of "encoding" for above.  taken from the
 * SunOS <multimedia/audio_filehdr.h>.
 */
#define	AUDIO_FILE_ENCODING_MULAW_8		1
#define	AUDIO_FILE_ENCODING_LINEAR_8		2
#define	AUDIO_FILE_ENCODING_LINEAR_16		3
#define	AUDIO_FILE_ENCODING_LINEAR_24		4
#define	AUDIO_FILE_ENCODING_LINEAR_32		5
#define	AUDIO_FILE_ENCODING_FLOAT		6
#define	AUDIO_FILE_ENCODING_DOUBLE		7
#define	AUDIO_FILE_ENCODING_ADPCM_G721		23
#define	AUDIO_FILE_ENCODING_ADPCM_G722		24
#define	AUDIO_FILE_ENCODING_ADPCM_G723_3	25
#define	AUDIO_FILE_ENCODING_ADPCM_G723_5	26
#define	AUDIO_FILE_ENCODING_ALAW_8		27

const char *audio_enc_from_val (int);
int	audio_enc_to_val (const char *);

int	audio_sun_to_encoding (int, u_int *, u_int *);
int	audio_encoding_to_sun (int, int, int *);

/*
 * M$ WAV files, info gleamed from sox sources
 */

/*
 * This is the WAV audio file magic value.  Note that it
 * is also `RIFF' and `WAVE' in ASCII.
 */
#define	WAVAUDIO_FILE_MAGIC_RIFF	((u_int32_t)0x52494646)
#define	WAVAUDIO_FILE_MAGIC_WAVE	((u_int32_t)0x57415645)
#define	WAVAUDIO_FILE_MAGIC_FMT		((u_int32_t)0x666d7420)
#define	WAVAUDIO_FILE_MAGIC_DATA	((u_int32_t)0x64617461)

/* purloined from public Microsoft RIFF docs via sox or mplayer */
#define WAVE_FORMAT_UNKNOWN		(0x0000)
#define WAVE_FORMAT_PCM			(0x0001)
#define WAVE_FORMAT_ADPCM		(0x0002)
#define WAVE_FORMAT_ALAW		(0x0006)
#define WAVE_FORMAT_MULAW		(0x0007)
#define WAVE_FORMAT_OKI_ADPCM		(0x0010)
#define WAVE_FORMAT_IMA_ADPCM		(0x0011)
#define WAVE_FORMAT_DIGISTD		(0x0015)
#define WAVE_FORMAT_DIGIFIX		(0x0016)
#define WAVE_FORMAT_DOLBY_AC2		(0x0030)
#define WAVE_FORMAT_GSM610		(0x0031)
#define WAVE_FORMAT_ROCKWELL_ADPCM	(0x003b)
#define WAVE_FORMAT_ROCKWELL_DIGITALK	(0x003c)
#define WAVE_FORMAT_G721_ADPCM		(0x0040)
#define WAVE_FORMAT_G728_CELP		(0x0041)
#define WAVE_FORMAT_MPEG		(0x0050)
#define WAVE_FORMAT_MPEGLAYER3		(0x0055)
#define WAVE_FORMAT_G726_ADPCM		(0x0064)
#define WAVE_FORMAT_G722_ADPCM		(0x0065)
#define IBM_FORMAT_MULAW		(0x0101)
#define IBM_FORMAT_ALAW			(0x0102)
#define IBM_FORMAT_ADPCM		(0x0103)
#define WAVE_FORMAT_EXTENSIBLE		(0xfffe)

const char *wav_enc_from_val (int);

typedef struct {
	char		name[4];
	u_int32_t	len;
} wav_audioheaderpart;

typedef struct {
	u_int16_t	tag;
	u_int16_t	channels;
	u_int32_t	sample_rate;
	u_int32_t	avg_bps;
	u_int16_t	alignment;
	u_int16_t	bits_per_sample;
} __packed wav_audioheaderfmt;

typedef struct {
	u_int16_t	len;
	u_int16_t	valid_bits;
	u_int32_t	speaker_pos_mask;
	u_int16_t	sub_tag;
	u_int8_t	dummy[14];
} __packed wav_audiohdrextensible;

/* returns size of header, or -ve for failure */
ssize_t audio_wav_parse_hdr (void *, size_t, u_int *, u_int *, u_int *, u_int *, size_t *);

extern int verbose;

/*
 * audio routine error codes
 */
#define AUDIO_ENOENT		-1		/* no such audio format */
#define AUDIO_ESHORTHDR		-2		/* short header */
#define AUDIO_EWAVUNSUPP	-3		/* WAV: unsupported file */
#define AUDIO_EWAVBADPCM	-4		/* WAV: bad PCM bps */
#define AUDIO_EWAVNODATA	-5		/* WAV: missing data */
#define AUDIO_EINTERNAL		-6		/* internal error */

#define AUDIO_MAXERRNO		5

/* and something to get a string associated with this error */
const char *audio_errstring (int);

/*
 * generic routines?
 */
void	decode_int (const char *, int *);
void	decode_time (const char *, struct timeval *);
void	decode_encoding (const char *, int *);

/*
 * Write a sun/wav header, shared between record and merge.
 *
 * Note that write_header() may change the values of format,
 * encoding.
 */

struct write_info {
	int	outfd;
	char	*header_info;
	int	format;
	int	encoding;
	int	precision;
	int	qflag;
	ssize_t	total_size;
	int	sample_rate;
	int	channels;
};

typedef void (*write_conv_func) (u_char *, int);

void	write_header (struct write_info *);
write_conv_func write_get_conv_func(struct write_info *);

/* backends for the above */
int sun_prepare_header(struct write_info *wi, void **hdrp, size_t *lenp, int *leftp);
int wav_prepare_header(struct write_info *wi, void **hdrp, size_t *lenp, int *leftp);
write_conv_func sun_write_get_conv_func(struct write_info *wi);
write_conv_func wav_write_get_conv_func(struct write_info *wi);

extern char	audio_default_info[8];

/*
 * get/put 16/32 bits of big/little endian data
 */
#include <sys/types.h>
#include <machine/endian.h>
#include <machine/bswap.h>

#if BYTE_ORDER == BIG_ENDIAN

#define getle16(v)	bswap16(v)
#define getle32(v)	bswap32(v)
#define getbe16(v)	(v)
#define getbe32(v)	(v)

#define putle16(x,v)	(x) = bswap16(v)
#define putle32(x,v)	(x) = bswap32(v)
#define putbe16(x,v)	(x) = (v)
#define putbe32(x,v)	(x) = (v)

#else

#define getle16(v)	(v)
#define getle32(v)	(v)
#define getbe16(v)	bswap16(v)
#define getbe32(v)	bswap32(v)

#define putle16(x,v)	(x) = (v)
#define putle32(x,v)	(x) = (v)
#define putbe16(x,v)	(x) = bswap16(v)
#define putbe32(x,v)	(x) = bswap32(v)

#endif