1 /* $NetBSD: libaudio.h,v 1.10 2002/01/15 23:48:52 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_NONE 1 35 #define AUDIO_FORMAT_SUN 2 36 #define AUDIO_FORMAT_WAV 3 37 38 int audio_format_from_str (char *); 39 40 /* 41 * We copy the Sun/NeXT on-disk audio header format and document what 42 * we know of it here. 43 * 44 * The header size appears to be an offset to where the data really 45 * begins, rather than defining the real length of the audio header. 46 * The Sun/NeXT audio format seems to only use 24 bytes of data (with 47 * an additional 8 bytes of nuls written, padding it to 32 bytes). 48 * 49 * If the size of the audio data is unknown (eg, reading from a pipe) 50 * the Sun demo audio tools place AUDIO_UNKNOWN_SIZE in the 51 * `data_size' member. 52 * 53 * For stereo data, the channels appear to be interleaved with the 54 * left channel first. For more channels, who knows? 55 */ 56 57 /* 58 * This is the Sun/NeXT audio file magic value. Note that it 59 * is also `.snd' in ASCII. 60 */ 61 #define AUDIO_FILE_MAGIC ((u_int32_t)0x2e736e64) 62 #define AUDIO_UNKNOWN_SIZE ((unsigned)(~0)) 63 64 typedef struct { 65 u_int32_t magic; 66 u_int32_t hdr_size; /* header size; in bytes */ 67 u_int32_t data_size; /* optional; in bytes */ 68 u_int32_t encoding; /* see below */ 69 u_int32_t sample_rate; /* per second */ 70 u_int32_t channels; /* number of interleaved channels */ 71 } sun_audioheader; 72 73 #define Audio_filehdr sun_audioheader /* SunOS compat(?) */ 74 75 /* 76 * these are the types of "encoding" for above. taken from the 77 * SunOS <multimedia/audio_filehdr.h>. 78 */ 79 #define AUDIO_FILE_ENCODING_MULAW_8 1 80 #define AUDIO_FILE_ENCODING_LINEAR_8 2 81 #define AUDIO_FILE_ENCODING_LINEAR_16 3 82 #define AUDIO_FILE_ENCODING_LINEAR_24 4 83 #define AUDIO_FILE_ENCODING_LINEAR_32 5 84 #define AUDIO_FILE_ENCODING_FLOAT 6 85 #define AUDIO_FILE_ENCODING_DOUBLE 7 86 #define AUDIO_FILE_ENCODING_ADPCM_G721 23 87 #define AUDIO_FILE_ENCODING_ADPCM_G722 24 88 #define AUDIO_FILE_ENCODING_ADPCM_G723_3 25 89 #define AUDIO_FILE_ENCODING_ADPCM_G723_5 26 90 #define AUDIO_FILE_ENCODING_ALAW_8 27 91 92 const char *audio_enc_from_val (int); 93 int audio_enc_to_val (const char *); 94 95 int audio_sun_to_encoding (int, int *, int *); 96 int audio_encoding_to_sun (int, int, int *); 97 98 /* 99 * M$ WAV files, info gleamed from sox sources 100 */ 101 102 /* 103 * This is the WAV audio file magic value. Note that it 104 * is also `RIFF' and `WAVE' in ASCII. 105 */ 106 #define WAVAUDIO_FILE_MAGIC_RIFF ((u_int32_t)0x52494646) 107 #define WAVAUDIO_FILE_MAGIC_WAVE ((u_int32_t)0x57415645) 108 #define WAVAUDIO_FILE_MAGIC_FMT ((u_int32_t)0x666d7420) 109 #define WAVAUDIO_FILE_MAGIC_DATA ((u_int32_t)0x64617461) 110 111 /* purloined from public Microsoft RIFF docs via sox */ 112 #define WAVE_FORMAT_UNKNOWN (0x0000) 113 #define WAVE_FORMAT_PCM (0x0001) 114 #define WAVE_FORMAT_ADPCM (0x0002) 115 #define WAVE_FORMAT_ALAW (0x0006) 116 #define WAVE_FORMAT_MULAW (0x0007) 117 #define WAVE_FORMAT_OKI_ADPCM (0x0010) 118 #define WAVE_FORMAT_DIGISTD (0x0015) 119 #define WAVE_FORMAT_DIGIFIX (0x0016) 120 #define IBM_FORMAT_MULAW (0x0101) 121 #define IBM_FORMAT_ALAW (0x0102) 122 #define IBM_FORMAT_ADPCM (0x0103) 123 124 const char *wav_enc_from_val (int); 125 126 typedef struct { 127 char name[4]; 128 u_int32_t len; 129 } wav_audioheaderpart; 130 131 typedef struct { 132 u_int16_t tag; 133 u_int16_t channels; 134 u_int32_t sample_rate; 135 u_int32_t avg_bps; 136 u_int16_t alignment; 137 u_int16_t bits_per_sample; 138 } wav_audioheaderfmt __attribute__((__packed__)); 139 140 /* returns size of header, or -ve for failure */ 141 ssize_t audio_wav_parse_hdr (void *, size_t, int *, int *, int *, int *, size_t *); 142 143 /* 144 * audio routine error codes 145 */ 146 #define AUDIO_ENOENT -1 /* no such audio format */ 147 #define AUDIO_ESHORTHDR -2 /* short header */ 148 #define AUDIO_EWAVUNSUPP -3 /* WAV: unsupported file */ 149 #define AUDIO_EWAVBADPCM -4 /* WAV: bad PCM bps */ 150 #define AUDIO_EWAVNODATA -5 /* WAV: missing data */ 151 #define AUDIO_EINTERNAL -6 /* internal error */ 152 153 #define AUDIO_MAXERRNO 5 154 155 /* and something to get a string associated with this error */ 156 const char *audio_errstring (int); 157 158 /* 159 * generic routines? 160 */ 161 void decode_int (const char *, int *); 162 void decode_time (const char *, struct timeval *); 163 void decode_encoding (const char *, int *); 164 165 /* 166 * get/put 16/32 bits of big/little endian data 167 */ 168 #include <sys/types.h> 169 #include <machine/endian.h> 170 #include <machine/bswap.h> 171 172 #if BYTE_ORDER == BIG_ENDIAN 173 174 #define getle16(v) bswap16(v) 175 #define getle32(v) bswap32(v) 176 #define getbe16(v) (v) 177 #define getbe32(v) (v) 178 179 #define putle16(x,v) (x) = bswap16(v) 180 #define putle32(x,v) (x) = bswap32(v) 181 #define putbe16(x,v) (x) = (v) 182 #define putbe32(x,v) (x) = (v) 183 184 #else 185 186 #define getle16(v) (v) 187 #define getle32(v) (v) 188 #define getbe16(v) bswap16(v) 189 #define getbe32(v) bswap32(v) 190 191 #define putle16(x,v) (x) = (v) 192 #define putle32(x,v) (x) = (v) 193 #define putbe16(x,v) (x) = bswap16(v) 194 #define putbe32(x,v) (x) = bswap32(v) 195 196 #endif 197