1 /* $NetBSD: libaudio.h,v 1.15 2008/05/29 14:51:27 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * audio formats 31 */ 32 #define AUDIO_FORMAT_DEFAULT -1 33 #define AUDIO_FORMAT_NONE 1 34 #define AUDIO_FORMAT_SUN 2 35 #define AUDIO_FORMAT_WAV 3 36 37 int audio_format_from_str (char *); 38 39 /* 40 * We copy the Sun/NeXT on-disk audio header format and document what 41 * we know of it here. 42 * 43 * The header size appears to be an offset to where the data really 44 * begins, rather than defining the real length of the audio header. 45 * The Sun/NeXT audio format seems to only use 24 bytes of data (with 46 * an additional 8 bytes of nuls written, padding it to 32 bytes). 47 * 48 * If the size of the audio data is unknown (eg, reading from a pipe) 49 * the Sun demo audio tools place AUDIO_UNKNOWN_SIZE in the 50 * `data_size' member. 51 * 52 * For stereo data, the channels appear to be interleaved with the 53 * left channel first. For more channels, who knows? 54 */ 55 56 /* 57 * This is the Sun/NeXT audio file magic value. Note that it 58 * is also `.snd' in ASCII. 59 */ 60 #define AUDIO_FILE_MAGIC ((u_int32_t)0x2e736e64) 61 #define AUDIO_UNKNOWN_SIZE ((unsigned)(~0)) 62 63 typedef struct { 64 u_int32_t magic; 65 u_int32_t hdr_size; /* header size; in bytes */ 66 u_int32_t data_size; /* optional; in bytes */ 67 u_int32_t encoding; /* see below */ 68 u_int32_t sample_rate; /* per second */ 69 u_int32_t channels; /* number of interleaved channels */ 70 } sun_audioheader; 71 72 #define Audio_filehdr sun_audioheader /* SunOS compat(?) */ 73 74 /* 75 * these are the types of "encoding" for above. taken from the 76 * SunOS <multimedia/audio_filehdr.h>. 77 */ 78 #define AUDIO_FILE_ENCODING_MULAW_8 1 79 #define AUDIO_FILE_ENCODING_LINEAR_8 2 80 #define AUDIO_FILE_ENCODING_LINEAR_16 3 81 #define AUDIO_FILE_ENCODING_LINEAR_24 4 82 #define AUDIO_FILE_ENCODING_LINEAR_32 5 83 #define AUDIO_FILE_ENCODING_FLOAT 6 84 #define AUDIO_FILE_ENCODING_DOUBLE 7 85 #define AUDIO_FILE_ENCODING_ADPCM_G721 23 86 #define AUDIO_FILE_ENCODING_ADPCM_G722 24 87 #define AUDIO_FILE_ENCODING_ADPCM_G723_3 25 88 #define AUDIO_FILE_ENCODING_ADPCM_G723_5 26 89 #define AUDIO_FILE_ENCODING_ALAW_8 27 90 91 const char *audio_enc_from_val (int); 92 int audio_enc_to_val (const char *); 93 94 int audio_sun_to_encoding (int, u_int *, u_int *); 95 int audio_encoding_to_sun (int, int, int *); 96 97 /* 98 * M$ WAV files, info gleamed from sox sources 99 */ 100 101 /* 102 * This is the WAV audio file magic value. Note that it 103 * is also `RIFF' and `WAVE' in ASCII. 104 */ 105 #define WAVAUDIO_FILE_MAGIC_RIFF ((u_int32_t)0x52494646) 106 #define WAVAUDIO_FILE_MAGIC_WAVE ((u_int32_t)0x57415645) 107 #define WAVAUDIO_FILE_MAGIC_FMT ((u_int32_t)0x666d7420) 108 #define WAVAUDIO_FILE_MAGIC_DATA ((u_int32_t)0x64617461) 109 110 /* purloined from public Microsoft RIFF docs via sox */ 111 #define WAVE_FORMAT_UNKNOWN (0x0000) 112 #define WAVE_FORMAT_PCM (0x0001) 113 #define WAVE_FORMAT_ADPCM (0x0002) 114 #define WAVE_FORMAT_ALAW (0x0006) 115 #define WAVE_FORMAT_MULAW (0x0007) 116 #define WAVE_FORMAT_OKI_ADPCM (0x0010) 117 #define WAVE_FORMAT_DIGISTD (0x0015) 118 #define WAVE_FORMAT_DIGIFIX (0x0016) 119 #define IBM_FORMAT_MULAW (0x0101) 120 #define IBM_FORMAT_ALAW (0x0102) 121 #define IBM_FORMAT_ADPCM (0x0103) 122 123 const char *wav_enc_from_val (int); 124 125 typedef struct { 126 char name[4]; 127 u_int32_t len; 128 } wav_audioheaderpart; 129 130 typedef struct { 131 u_int16_t tag; 132 u_int16_t channels; 133 u_int32_t sample_rate; 134 u_int32_t avg_bps; 135 u_int16_t alignment; 136 u_int16_t bits_per_sample; 137 } __packed wav_audioheaderfmt; 138 139 /* returns size of header, or -ve for failure */ 140 ssize_t audio_wav_parse_hdr (void *, size_t, u_int *, u_int *, u_int *, u_int *, size_t *); 141 142 /* 143 * audio routine error codes 144 */ 145 #define AUDIO_ENOENT -1 /* no such audio format */ 146 #define AUDIO_ESHORTHDR -2 /* short header */ 147 #define AUDIO_EWAVUNSUPP -3 /* WAV: unsupported file */ 148 #define AUDIO_EWAVBADPCM -4 /* WAV: bad PCM bps */ 149 #define AUDIO_EWAVNODATA -5 /* WAV: missing data */ 150 #define AUDIO_EINTERNAL -6 /* internal error */ 151 152 #define AUDIO_MAXERRNO 5 153 154 /* and something to get a string associated with this error */ 155 const char *audio_errstring (int); 156 157 /* 158 * generic routines? 159 */ 160 void decode_int (const char *, int *); 161 void decode_time (const char *, struct timeval *); 162 void decode_encoding (const char *, int *); 163 164 /* 165 * get/put 16/32 bits of big/little endian data 166 */ 167 #include <sys/types.h> 168 #include <machine/endian.h> 169 #include <machine/bswap.h> 170 171 #if BYTE_ORDER == BIG_ENDIAN 172 173 #define getle16(v) bswap16(v) 174 #define getle32(v) bswap32(v) 175 #define getbe16(v) (v) 176 #define getbe32(v) (v) 177 178 #define putle16(x,v) (x) = bswap16(v) 179 #define putle32(x,v) (x) = bswap32(v) 180 #define putbe16(x,v) (x) = (v) 181 #define putbe32(x,v) (x) = (v) 182 183 #else 184 185 #define getle16(v) (v) 186 #define getle32(v) (v) 187 #define getbe16(v) bswap16(v) 188 #define getbe32(v) bswap32(v) 189 190 #define putle16(x,v) (x) = (v) 191 #define putle32(x,v) (x) = (v) 192 #define putbe16(x,v) (x) = bswap16(v) 193 #define putbe32(x,v) (x) = bswap32(v) 194 195 #endif 196