1 /* $NetBSD: audio.c,v 1.27 2024/02/27 21:05:34 gson Exp $ */ 2 3 /* 4 * Copyright (c) 1999, 2013, 2015, 2019 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 1.27 2024/02/27 21:05:34 gson 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 #include <sys/uio.h> 44 45 #include <unistd.h> 46 #include <ctype.h> 47 #include <err.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 52 #include "libaudio.h" 53 #include "auconv.h" 54 55 /* what format am i? */ 56 57 static const struct { 58 const char *fname; 59 int fno; 60 } formats[] = { 61 { "sunau", AUDIO_FORMAT_SUN }, 62 { "au", AUDIO_FORMAT_SUN }, 63 { "sun", AUDIO_FORMAT_SUN }, 64 { "wav", AUDIO_FORMAT_WAV }, 65 { "wave", AUDIO_FORMAT_WAV }, 66 { "riff", AUDIO_FORMAT_WAV }, 67 { "no", AUDIO_FORMAT_NONE }, 68 { "none", AUDIO_FORMAT_NONE }, 69 { NULL, -1 } 70 }; 71 72 char audio_default_info[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' }; 73 74 int 75 audio_format_from_str(char *str) 76 { 77 int i; 78 79 for (i = 0; formats[i].fname; i++) 80 if (strcasecmp(formats[i].fname, str) == 0) 81 break; 82 return (formats[i].fno); 83 } 84 85 86 87 /* back and forth between encodings */ 88 static const struct { 89 const char *ename; 90 int eno; 91 } encs[] = { 92 { AudioEmulaw, AUDIO_ENCODING_ULAW }, 93 { "ulaw", AUDIO_ENCODING_ULAW }, 94 { AudioEalaw, AUDIO_ENCODING_ALAW }, 95 { AudioEslinear, AUDIO_ENCODING_SLINEAR }, 96 { "linear", AUDIO_ENCODING_SLINEAR }, 97 { AudioEulinear, AUDIO_ENCODING_ULINEAR }, 98 { AudioEadpcm, AUDIO_ENCODING_ADPCM }, 99 { "ADPCM", AUDIO_ENCODING_ADPCM }, 100 { AudioEslinear_le, AUDIO_ENCODING_SLINEAR_LE }, 101 { "linear_le", AUDIO_ENCODING_SLINEAR_LE }, 102 { AudioEulinear_le, AUDIO_ENCODING_ULINEAR_LE }, 103 { AudioEslinear_be, AUDIO_ENCODING_SLINEAR_BE }, 104 { "linear_be", AUDIO_ENCODING_SLINEAR_BE }, 105 { AudioEulinear_be, AUDIO_ENCODING_ULINEAR_BE }, 106 { AudioEmpeg_l1_stream, AUDIO_ENCODING_MPEG_L1_STREAM }, 107 { AudioEmpeg_l1_packets,AUDIO_ENCODING_MPEG_L1_PACKETS }, 108 { AudioEmpeg_l1_system, AUDIO_ENCODING_MPEG_L1_SYSTEM }, 109 { AudioEmpeg_l2_stream, AUDIO_ENCODING_MPEG_L2_STREAM }, 110 { AudioEmpeg_l2_packets,AUDIO_ENCODING_MPEG_L2_PACKETS }, 111 { AudioEmpeg_l2_system, AUDIO_ENCODING_MPEG_L2_SYSTEM }, 112 { AudioEac3, AUDIO_ENCODING_AC3 }, 113 { "ieee_float32", AUDIO_ENCODING_LIBAUDIO_FLOAT32 }, 114 { "ieee_float64", AUDIO_ENCODING_LIBAUDIO_FLOAT64 }, 115 { NULL, -1 } 116 }; 117 118 119 const char * 120 audio_enc_from_val(int val) 121 { 122 int i; 123 124 for (i = 0; encs[i].ename; i++) 125 if (encs[i].eno == val) 126 break; 127 return (encs[i].ename); 128 } 129 130 int 131 audio_enc_to_val(const char *enc) 132 { 133 int i; 134 135 for (i = 0; encs[i].ename; i++) 136 if (strcmp(encs[i].ename, enc) == 0) 137 break; 138 if (encs[i].ename) 139 return (encs[i].eno); 140 else 141 return (AUDIO_ENOENT); 142 } 143 144 /* 145 * decode a string into an encoding value. 146 */ 147 void 148 decode_encoding(const char *arg, int *encp) 149 { 150 size_t len; 151 int i; 152 153 len = strlen(arg); 154 for (i = 0; encs[i].ename; i++) 155 if (strncmp(encs[i].ename, arg, len) == 0) { 156 *encp = encs[i].eno; 157 return; 158 } 159 errx(1, "unknown encoding `%s'", arg); 160 } 161 162 static const char *const audio_errlist[] = { 163 "error zero", /* nothing? */ 164 "no audio entry", /* AUDIO_ENOENT */ 165 "short header", /* AUDIO_ESHORTHDR */ 166 "unsupported WAV format", /* AUDIO_EWAVUNSUPP */ 167 "bad (unsupported) WAV PCM format", /* AUDIO_EWAVBADPCM */ 168 "no WAV audio data", /* AUDIO_EWAVNODATA */ 169 "internal error", /* AUDIO_EINTERNAL */ 170 }; 171 172 const char * 173 audio_errstring(int errval) 174 { 175 176 errval = -errval; 177 if (errval < 1 || errval > AUDIO_MAXERRNO) 178 return "Invalid error"; 179 return audio_errlist[errval]; 180 } 181 182 void 183 write_header(struct track_info *ti) 184 { 185 struct iovec iv[3]; 186 int veclen, left, tlen; 187 void *hdr; 188 size_t hdrlen; 189 190 switch (ti->format) { 191 case AUDIO_FORMAT_DEFAULT: 192 case AUDIO_FORMAT_SUN: 193 if (sun_prepare_header(ti, &hdr, &hdrlen, &left) != 0) 194 return; 195 break; 196 case AUDIO_FORMAT_WAV: 197 if (wav_prepare_header(ti, &hdr, &hdrlen, &left) != 0) 198 return; 199 break; 200 case AUDIO_FORMAT_NONE: 201 return; 202 default: 203 errx(1, "unknown audio format"); 204 } 205 206 veclen = 0; 207 tlen = 0; 208 209 if (hdrlen != 0) { 210 iv[veclen].iov_base = hdr; 211 iv[veclen].iov_len = hdrlen; 212 tlen += iv[veclen++].iov_len; 213 } 214 if (ti->header_info) { 215 iv[veclen].iov_base = ti->header_info; 216 iv[veclen].iov_len = (int)strlen(ti->header_info) + 1; 217 tlen += iv[veclen++].iov_len; 218 } 219 if (left) { 220 iv[veclen].iov_base = audio_default_info; 221 iv[veclen].iov_len = left; 222 tlen += iv[veclen++].iov_len; 223 } 224 225 if (tlen == 0) 226 return; 227 228 if (writev(ti->outfd, iv, veclen) != tlen) 229 err(1, "could not write audio header"); 230 } 231 232 write_conv_func 233 write_get_conv_func(struct track_info *ti) 234 { 235 236 switch (ti->format) { 237 case AUDIO_FORMAT_DEFAULT: 238 case AUDIO_FORMAT_SUN: 239 return sun_write_get_conv_func(ti); 240 case AUDIO_FORMAT_WAV: 241 return wav_write_get_conv_func(ti); 242 case AUDIO_FORMAT_NONE: 243 return NULL; 244 default: 245 errx(1, "unknown audio format"); 246 } 247 } 248
Indexes created Wed Sep 24 14:09:57 GMT 2025