1 /* $NetBSD: libaudio.h,v 1.11 2002/02/10 15:30:53 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1999 Matthew R. Green 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * audio formats 33 */ 34 #define AUDIO_FORMAT_DEFAULT -1 35 #define AUDIO_FORMAT_NONE 1 36 #define AUDIO_FORMAT_SUN 2 37 #define AUDIO_FORMAT_WAV 3 38 39 int audio_format_from_str (char *); 40 41 /* 42 * We copy the Sun/NeXT on-disk audio header format and document what 43 * we know of it here. 44 * 45 * The header size appears to be an offset to where the data really 46 * begins, rather than defining the real length of the audio header. 47 * The Sun/NeXT audio format seems to only use 24 bytes of data (with 48 * an additional 8 bytes of nuls written, padding it to 32 bytes). 49 * 50 * If the size of the audio data is unknown (eg, reading from a pipe) 51 * the Sun demo audio tools place AUDIO_UNKNOWN_SIZE in the 52 * `data_size' member. 53 * 54 * For stereo data, the channels appear to be interleaved with the 55 * left channel first. For more channels, who knows? 56 */ 57 58 /* 59 * This is the Sun/NeXT audio file magic value. Note that it 60 * is also `.snd' in ASCII. 61 */ 62 #define AUDIO_FILE_MAGIC ((u_int32_t)0x2e736e64) 63 #define AUDIO_UNKNOWN_SIZE ((unsigned)(~0)) 64 65 typedef struct { 66 u_int32_t magic; 67 u_int32_t hdr_size; /* header size; in bytes */ 68 u_int32_t data_size; /* optional; in bytes */ 69 u_int32_t encoding; /* see below */ 70 u_int32_t sample_rate; /* per second */ 71 u_int32_t channels; /* number of interleaved channels */ 72 } sun_audioheader; 73 74 #define Audio_filehdr sun_audioheader /* SunOS compat(?) */ 75 76 /* 77 * these are the types of "encoding" for above. taken from the 78 * SunOS <multimedia/audio_filehdr.h>. 79 */ 80 #define AUDIO_FILE_ENCODING_MULAW_8 1 81 #define AUDIO_FILE_ENCODING_LINEAR_8 2 82 #define AUDIO_FILE_ENCODING_LINEAR_16 3 83 #define AUDIO_FILE_ENCODING_LINEAR_24 4 84 #define AUDIO_FILE_ENCODING_LINEAR_32 5 85 #define AUDIO_FILE_ENCODING_FLOAT 6 86 #define AUDIO_FILE_ENCODING_DOUBLE 7 87 #define AUDIO_FILE_ENCODING_ADPCM_G721 23 88 #define AUDIO_FILE_ENCODING_ADPCM_G722 24 89 #define AUDIO_FILE_ENCODING_ADPCM_G723_3 25 90 #define AUDIO_FILE_ENCODING_ADPCM_G723_5 26 91 #define AUDIO_FILE_ENCODING_ALAW_8 27 92 93 const char *audio_enc_from_val (int); 94 int audio_enc_to_val (const char *); 95 96 int audio_sun_to_encoding (int, int *, int *); 97 int audio_encoding_to_sun (int, int, int *); 98 99 /* 100 * M$ WAV files, info gleamed from sox sources 101 */ 102 103 /* 104 * This is the WAV audio file magic value. Note that it 105 * is also `RIFF' and `WAVE' in ASCII. 106 */ 107 #define WAVAUDIO_FILE_MAGIC_RIFF ((u_int32_t)0x52494646) 108 #define WAVAUDIO_FILE_MAGIC_WAVE ((u_int32_t)0x57415645) 109 #define WAVAUDIO_FILE_MAGIC_FMT ((u_int32_t)0x666d7420) 110 #define WAVAUDIO_FILE_MAGIC_DATA ((u_int32_t)0x64617461) 111 112 /* purloined from public Microsoft RIFF docs via sox */ 113 #define WAVE_FORMAT_UNKNOWN (0x0000) 114 #define WAVE_FORMAT_PCM (0x0001) 115 #define WAVE_FORMAT_ADPCM (0x0002) 116 #define WAVE_FORMAT_ALAW (0x0006) 117 #define WAVE_FORMAT_MULAW (0x0007) 118 #define WAVE_FORMAT_OKI_ADPCM (0x0010) 119 #define WAVE_FORMAT_DIGISTD (0x0015) 120 #define WAVE_FORMAT_DIGIFIX (0x0016) 121 #define IBM_FORMAT_MULAW (0x0101) 122 #define IBM_FORMAT_ALAW (0x0102) 123 #define IBM_FORMAT_ADPCM (0x0103) 124 125 const char *wav_enc_from_val (int); 126 127 typedef struct { 128 char name[4]; 129 u_int32_t len; 130 } wav_audioheaderpart; 131 132 typedef struct { 133 u_int16_t tag; 134 u_int16_t channels; 135 u_int32_t sample_rate; 136 u_int32_t avg_bps; 137 u_int16_t alignment; 138 u_int16_t bits_per_sample; 139 } wav_audioheaderfmt __attribute__((__packed__)); 140 141 /* returns size of header, or -ve for failure */ 142 ssize_t audio_wav_parse_hdr (void *, size_t, int *, int *, int *, int *, size_t *); 143 144 /* 145 * audio routine error codes 146 */ 147 #define AUDIO_ENOENT -1 /* no such audio format */ 148 #define AUDIO_ESHORTHDR -2 /* short header */ 149 #define AUDIO_EWAVUNSUPP -3 /* WAV: unsupported file */ 150 #define AUDIO_EWAVBADPCM -4 /* WAV: bad PCM bps */ 151 #define AUDIO_EWAVNODATA -5 /* WAV: missing data */ 152 #define AUDIO_EINTERNAL -6 /* internal error */ 153 154 #define AUDIO_MAXERRNO 5 155 156 /* and something to get a string associated with this error */ 157 const char *audio_errstring (int); 158 159 /* 160 * generic routines? 161 */ 162 void decode_int (const char *, int *); 163 void decode_time (const char *, struct timeval *); 164 void decode_encoding (const char *, int *); 165 166 /* 167 * get/put 16/32 bits of big/little endian data 168 */ 169 #include <sys/types.h> 170 #include <machine/endian.h> 171 #include <machine/bswap.h> 172 173 #if BYTE_ORDER == BIG_ENDIAN 174 175 #define getle16(v) bswap16(v) 176 #define getle32(v) bswap32(v) 177 #define getbe16(v) (v) 178 #define getbe32(v) (v) 179 180 #define putle16(x,v) (x) = bswap16(v) 181 #define putle32(x,v) (x) = bswap32(v) 182 #define putbe16(x,v) (x) = (v) 183 #define putbe32(x,v) (x) = (v) 184 185 #else 186 187 #define getle16(v) (v) 188 #define getle32(v) (v) 189 #define getbe16(v) bswap16(v) 190 #define getbe32(v) bswap32(v) 191 192 #define putle16(x,v) (x) = (v) 193 #define putle32(x,v) (x) = (v) 194 #define putbe16(x,v) (x) = bswap16(v) 195 #define putbe32(x,v) (x) = bswap32(v) 196 197 #endif 198