/* $NetBSD: libaudio.h,v 1.11 2002/02/10 15:30:53 mrg Exp $ */ /* * Copyright (c) 1999 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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 . */ #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, int *, 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 */ #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_DIGISTD (0x0015) #define WAVE_FORMAT_DIGIFIX (0x0016) #define IBM_FORMAT_MULAW (0x0101) #define IBM_FORMAT_ALAW (0x0102) #define IBM_FORMAT_ADPCM (0x0103) 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; } wav_audioheaderfmt __attribute__((__packed__)); /* returns size of header, or -ve for failure */ ssize_t audio_wav_parse_hdr (void *, size_t, int *, int *, int *, int *, size_t *); /* * 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 *); /* * get/put 16/32 bits of big/little endian data */ #include #include #include #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