198 lines
6.1 KiB
C
198 lines
6.1 KiB
C
/* $NetBSD: libaudio.h,v 1.11 2002/02/10 15:30:53 mrg Exp $ */
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/*
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* Copyright (c) 1999 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* audio formats
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*/
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#define AUDIO_FORMAT_DEFAULT -1
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#define AUDIO_FORMAT_NONE 1
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#define AUDIO_FORMAT_SUN 2
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#define AUDIO_FORMAT_WAV 3
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int audio_format_from_str (char *);
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/*
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* We copy the Sun/NeXT on-disk audio header format and document what
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* we know of it here.
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*
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* The header size appears to be an offset to where the data really
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* begins, rather than defining the real length of the audio header.
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* The Sun/NeXT audio format seems to only use 24 bytes of data (with
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* an additional 8 bytes of nuls written, padding it to 32 bytes).
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*
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* If the size of the audio data is unknown (eg, reading from a pipe)
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* the Sun demo audio tools place AUDIO_UNKNOWN_SIZE in the
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* `data_size' member.
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*
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* For stereo data, the channels appear to be interleaved with the
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* left channel first. For more channels, who knows?
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*/
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/*
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* This is the Sun/NeXT audio file magic value. Note that it
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* is also `.snd' in ASCII.
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*/
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#define AUDIO_FILE_MAGIC ((u_int32_t)0x2e736e64)
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#define AUDIO_UNKNOWN_SIZE ((unsigned)(~0))
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typedef struct {
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u_int32_t magic;
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u_int32_t hdr_size; /* header size; in bytes */
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u_int32_t data_size; /* optional; in bytes */
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u_int32_t encoding; /* see below */
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u_int32_t sample_rate; /* per second */
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u_int32_t channels; /* number of interleaved channels */
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} sun_audioheader;
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#define Audio_filehdr sun_audioheader /* SunOS compat(?) */
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/*
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* these are the types of "encoding" for above. taken from the
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* SunOS <multimedia/audio_filehdr.h>.
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*/
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#define AUDIO_FILE_ENCODING_MULAW_8 1
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#define AUDIO_FILE_ENCODING_LINEAR_8 2
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#define AUDIO_FILE_ENCODING_LINEAR_16 3
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#define AUDIO_FILE_ENCODING_LINEAR_24 4
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#define AUDIO_FILE_ENCODING_LINEAR_32 5
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#define AUDIO_FILE_ENCODING_FLOAT 6
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#define AUDIO_FILE_ENCODING_DOUBLE 7
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#define AUDIO_FILE_ENCODING_ADPCM_G721 23
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#define AUDIO_FILE_ENCODING_ADPCM_G722 24
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#define AUDIO_FILE_ENCODING_ADPCM_G723_3 25
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#define AUDIO_FILE_ENCODING_ADPCM_G723_5 26
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#define AUDIO_FILE_ENCODING_ALAW_8 27
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const char *audio_enc_from_val (int);
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int audio_enc_to_val (const char *);
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int audio_sun_to_encoding (int, int *, int *);
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int audio_encoding_to_sun (int, int, int *);
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/*
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* M$ WAV files, info gleamed from sox sources
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*/
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/*
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* This is the WAV audio file magic value. Note that it
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* is also `RIFF' and `WAVE' in ASCII.
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*/
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#define WAVAUDIO_FILE_MAGIC_RIFF ((u_int32_t)0x52494646)
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#define WAVAUDIO_FILE_MAGIC_WAVE ((u_int32_t)0x57415645)
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#define WAVAUDIO_FILE_MAGIC_FMT ((u_int32_t)0x666d7420)
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#define WAVAUDIO_FILE_MAGIC_DATA ((u_int32_t)0x64617461)
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/* purloined from public Microsoft RIFF docs via sox */
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#define WAVE_FORMAT_UNKNOWN (0x0000)
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#define WAVE_FORMAT_PCM (0x0001)
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#define WAVE_FORMAT_ADPCM (0x0002)
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#define WAVE_FORMAT_ALAW (0x0006)
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#define WAVE_FORMAT_MULAW (0x0007)
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#define WAVE_FORMAT_OKI_ADPCM (0x0010)
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#define WAVE_FORMAT_DIGISTD (0x0015)
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#define WAVE_FORMAT_DIGIFIX (0x0016)
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#define IBM_FORMAT_MULAW (0x0101)
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#define IBM_FORMAT_ALAW (0x0102)
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#define IBM_FORMAT_ADPCM (0x0103)
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const char *wav_enc_from_val (int);
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typedef struct {
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char name[4];
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u_int32_t len;
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} wav_audioheaderpart;
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typedef struct {
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u_int16_t tag;
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u_int16_t channels;
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u_int32_t sample_rate;
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u_int32_t avg_bps;
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u_int16_t alignment;
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u_int16_t bits_per_sample;
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} wav_audioheaderfmt __attribute__((__packed__));
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/* returns size of header, or -ve for failure */
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ssize_t audio_wav_parse_hdr (void *, size_t, int *, int *, int *, int *, size_t *);
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/*
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* audio routine error codes
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*/
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#define AUDIO_ENOENT -1 /* no such audio format */
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#define AUDIO_ESHORTHDR -2 /* short header */
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#define AUDIO_EWAVUNSUPP -3 /* WAV: unsupported file */
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#define AUDIO_EWAVBADPCM -4 /* WAV: bad PCM bps */
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#define AUDIO_EWAVNODATA -5 /* WAV: missing data */
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#define AUDIO_EINTERNAL -6 /* internal error */
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#define AUDIO_MAXERRNO 5
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/* and something to get a string associated with this error */
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const char *audio_errstring (int);
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/*
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* generic routines?
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*/
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void decode_int (const char *, int *);
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void decode_time (const char *, struct timeval *);
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void decode_encoding (const char *, int *);
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/*
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* get/put 16/32 bits of big/little endian data
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*/
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#include <sys/types.h>
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#include <machine/endian.h>
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#include <machine/bswap.h>
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#if BYTE_ORDER == BIG_ENDIAN
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#define getle16(v) bswap16(v)
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#define getle32(v) bswap32(v)
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#define getbe16(v) (v)
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#define getbe32(v) (v)
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#define putle16(x,v) (x) = bswap16(v)
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#define putle32(x,v) (x) = bswap32(v)
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#define putbe16(x,v) (x) = (v)
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#define putbe32(x,v) (x) = (v)
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#else
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#define getle16(v) (v)
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#define getle32(v) (v)
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#define getbe16(v) bswap16(v)
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#define getbe32(v) bswap32(v)
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#define putle16(x,v) (x) = (v)
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#define putle32(x,v) (x) = (v)
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#define putbe16(x,v) (x) = bswap16(v)
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#define putbe32(x,v) (x) = bswap32(v)
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#endif
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