audio.c revision 1.21
1 /* $NetBSD: audio.c,v 1.21 2011/09/06 22:41:53 jmcneill 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 * XXX this is slightly icky in places... 31 */ 32 #include <sys/cdefs.h> 33 34 #ifndef lint 35 __RCSID("$NetBSD: audio.c,v 1.21 2011/09/06 22:41:53 jmcneill Exp $"); 36 #endif 37 38 39 #include <sys/types.h> 40 #include <sys/audioio.h> 41 #include <sys/ioctl.h> 42 #include <sys/time.h> 43 44 #include <ctype.h> 45 #include <err.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 #include "libaudio.h" 51 52 /* what format am i? */ 53 54 static const struct { 55 const char *fname; 56 int fno; 57 } formats[] = { 58 { "sunau", AUDIO_FORMAT_SUN }, 59 { "au", AUDIO_FORMAT_SUN }, 60 { "sun", AUDIO_FORMAT_SUN }, 61 { "wav", AUDIO_FORMAT_WAV }, 62 { "wave", AUDIO_FORMAT_WAV }, 63 { "riff", AUDIO_FORMAT_WAV }, 64 { "no", AUDIO_FORMAT_NONE }, 65 { "none", AUDIO_FORMAT_NONE }, 66 { NULL, -1 } 67 }; 68 69 int 70 audio_format_from_str(char *str) 71 { 72 int i; 73 74 for (i = 0; formats[i].fname; i++) 75 if (strcasecmp(formats[i].fname, str) == 0) 76 break; 77 return (formats[i].fno); 78 } 79 80 81 82 /* back and forth between encodings */ 83 static const struct { 84 const char *ename; 85 int eno; 86 } encs[] = { 87 { AudioEmulaw, AUDIO_ENCODING_ULAW }, 88 { "ulaw", AUDIO_ENCODING_ULAW }, 89 { AudioEalaw, AUDIO_ENCODING_ALAW }, 90 { AudioEslinear, AUDIO_ENCODING_SLINEAR }, 91 { "linear", AUDIO_ENCODING_SLINEAR }, 92 { AudioEulinear, AUDIO_ENCODING_ULINEAR }, 93 { AudioEadpcm, AUDIO_ENCODING_ADPCM }, 94 { "ADPCM", AUDIO_ENCODING_ADPCM }, 95 { AudioEslinear_le, AUDIO_ENCODING_SLINEAR_LE }, 96 { "linear_le", AUDIO_ENCODING_SLINEAR_LE }, 97 { AudioEulinear_le, AUDIO_ENCODING_ULINEAR_LE }, 98 { AudioEslinear_be, AUDIO_ENCODING_SLINEAR_BE }, 99 { "linear_be", AUDIO_ENCODING_SLINEAR_BE }, 100 { AudioEulinear_be, AUDIO_ENCODING_ULINEAR_BE }, 101 { AudioEmpeg_l1_stream, AUDIO_ENCODING_MPEG_L1_STREAM }, 102 { AudioEmpeg_l1_packets,AUDIO_ENCODING_MPEG_L1_PACKETS }, 103 { AudioEmpeg_l1_system, AUDIO_ENCODING_MPEG_L1_SYSTEM }, 104 { AudioEmpeg_l2_stream, AUDIO_ENCODING_MPEG_L2_STREAM }, 105 { AudioEmpeg_l2_packets,AUDIO_ENCODING_MPEG_L2_PACKETS }, 106 { AudioEmpeg_l2_system, AUDIO_ENCODING_MPEG_L2_SYSTEM }, 107 { AudioEac3, AUDIO_ENCODING_AC3 }, 108 { NULL, -1 } 109 }; 110 111 112 const char * 113 audio_enc_from_val(int val) 114 { 115 int i; 116 117 for (i = 0; encs[i].ename; i++) 118 if (encs[i].eno == val) 119 break; 120 return (encs[i].ename); 121 } 122 123 int 124 audio_enc_to_val(const char *enc) 125 { 126 int i; 127 128 for (i = 0; encs[i].ename; i++) 129 if (strcmp(encs[i].ename, enc) == 0) 130 break; 131 if (encs[i].ename) 132 return (encs[i].eno); 133 else 134 return (AUDIO_ENOENT); 135 } 136 137 void 138 decode_int(const char *arg, int *intp) 139 { 140 char *ep; 141 int ret; 142 143 ret = (int)strtoul(arg, &ep, 10); 144 145 if (ep[0] == '\0') { 146 *intp = ret; 147 return; 148 } 149 errx(1, "argument `%s' not a valid integer", arg); 150 } 151 152 void 153 decode_time(const char *arg, struct timeval *tvp) 154 { 155 char *s, *colon, *dot; 156 char *copy = strdup(arg); 157 int first; 158 159 if (copy == NULL) 160 err(1, "could not allocate a copy of %s", arg); 161 162 tvp->tv_sec = tvp->tv_usec = 0; 163 s = copy; 164 165 /* handle [hh:]mm:ss.dd */ 166 if ((colon = strchr(s, ':')) != NULL) { 167 *colon++ = '\0'; 168 decode_int(s, &first); 169 tvp->tv_sec = first * 60; /* minutes */ 170 s = colon; 171 172 if ((colon = strchr(s, ':')) != NULL) { 173 *colon++ = '\0'; 174 decode_int(s, &first); 175 tvp->tv_sec += first; /* minutes and hours */ 176 tvp->tv_sec *= 60; 177 s = colon; 178 } 179 } 180 if ((dot = strchr(s, '.')) != NULL) { 181 int i, base = 100000; 182 183 *dot++ = '\0'; 184 185 for (i = 0; i < 6; i++, base /= 10) { 186 if (!dot[i]) 187 break; 188 if (!isdigit((unsigned char)dot[i])) 189 errx(1, "argument `%s' is not a value time specification", arg); 190 tvp->tv_usec += base * (dot[i] - '0'); 191 } 192 } 193 decode_int(s, &first); 194 tvp->tv_sec += first; 195 196 free(copy); 197 } 198 199 /* 200 * decode a string into an encoding value. 201 */ 202 void 203 decode_encoding(const char *arg, int *encp) 204 { 205 size_t len; 206 int i; 207 208 len = strlen(arg); 209 for (i = 0; encs[i].ename; i++) 210 if (strncmp(encs[i].ename, arg, len) == 0) { 211 *encp = encs[i].eno; 212 return; 213 } 214 errx(1, "unknown encoding `%s'", arg); 215 } 216 217 static const char *const audio_errlist[] = { 218 "error zero", /* nothing? */ 219 "no audio entry", /* AUDIO_ENOENT */ 220 "short header", /* AUDIO_ESHORTHDR */ 221 "unsupported WAV format", /* AUDIO_EWAVUNSUPP */ 222 "bad (unsupported) WAV PCM format", /* AUDIO_EWAVBADPCM */ 223 "no WAV audio data", /* AUDIO_EWAVNODATA */ 224 "internal error", /* AUDIO_EINTERNAL */ 225 }; 226 227 const char * 228 audio_errstring(int errval) 229 { 230 231 errval = -errval; 232 if (errval < 1 || errval > AUDIO_MAXERRNO) 233 return "Invalid error"; 234 return audio_errlist[errval]; 235 } 236
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