| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file server/normalize.c |
| 19 | * @brief Convert "raw" format output to the configured format |
| 20 | * |
| 21 | * Currently we invoke sox even for trivial conversions such as byte-swapping. |
| 22 | * Ideally we would do all conversion including resampling in this one process |
| 23 | * and eliminate the dependency on sox. |
| 24 | */ |
| 25 | |
| 26 | #include "disorder-server.h" |
| 27 | |
| 28 | static const struct option options[] = { |
| 29 | { "help", no_argument, 0, 'h' }, |
| 30 | { "version", no_argument, 0, 'V' }, |
| 31 | { "config", required_argument, 0, 'c' }, |
| 32 | { "debug", no_argument, 0, 'd' }, |
| 33 | { "no-debug", no_argument, 0, 'D' }, |
| 34 | { "syslog", no_argument, 0, 's' }, |
| 35 | { "no-syslog", no_argument, 0, 'S' }, |
| 36 | { 0, 0, 0, 0 } |
| 37 | }; |
| 38 | |
| 39 | /* display usage message and terminate */ |
| 40 | static void help(void) { |
| 41 | xprintf("Usage:\n" |
| 42 | " disorder-normalize [OPTIONS]\n" |
| 43 | "Options:\n" |
| 44 | " --help, -h Display usage message\n" |
| 45 | " --version, -V Display version number\n" |
| 46 | " --config PATH, -c PATH Set configuration file\n" |
| 47 | " --debug, -d Turn on debugging\n" |
| 48 | " --[no-]syslog Force logging\n" |
| 49 | "\n" |
| 50 | "Audio format normalizer for DisOrder. Not intended to be run\n" |
| 51 | "directly.\n"); |
| 52 | xfclose(stdout); |
| 53 | exit(0); |
| 54 | } |
| 55 | |
| 56 | /** @brief Copy bytes from one file descriptor to another |
| 57 | * @param infd File descriptor read from |
| 58 | * @param outfd File descriptor to write to |
| 59 | * @param n Number of bytes to copy |
| 60 | */ |
| 61 | static void copy(int infd, int outfd, size_t n) { |
| 62 | char buffer[4096]; |
| 63 | ssize_t written; |
| 64 | |
| 65 | while(n > 0) { |
| 66 | const ssize_t readden = read(infd, buffer, |
| 67 | n > sizeof buffer ? sizeof buffer : n); |
| 68 | if(readden < 0) { |
| 69 | if(errno == EINTR) |
| 70 | continue; |
| 71 | else |
| 72 | disorder_fatal(errno, "read error"); |
| 73 | } |
| 74 | if(readden == 0) |
| 75 | disorder_fatal(0, "unexpected EOF"); |
| 76 | n -= readden; |
| 77 | written = 0; |
| 78 | while(written < readden) { |
| 79 | const ssize_t w = write(outfd, buffer + written, readden - written); |
| 80 | if(w < 0) |
| 81 | disorder_fatal(errno, "write error"); |
| 82 | written += w; |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | static void soxargs(const char ***pp, char **qq, |
| 88 | const struct stream_header *header) { |
| 89 | *(*pp)++ = "-t.raw"; |
| 90 | *(*pp)++ = "-s"; |
| 91 | *qq += sprintf((char *)(*(*pp)++ = *qq), "-r%d", header->rate) + 1; |
| 92 | *qq += sprintf((char *)(*(*pp)++ = *qq), "-c%d", header->channels) + 1; |
| 93 | /* sox 12.17.9 insists on -b etc; CVS sox insists on -<n> etc; both are |
| 94 | * deployed! */ |
| 95 | switch(config->sox_generation) { |
| 96 | case 0: |
| 97 | if(header->bits != 8 |
| 98 | && header->endian != ENDIAN_NATIVE) |
| 99 | *(*pp)++ = "-x"; |
| 100 | switch(header->bits) { |
| 101 | case 8: *(*pp)++ = "-b"; break; |
| 102 | case 16: *(*pp)++ = "-w"; break; |
| 103 | case 32: *(*pp)++ = "-l"; break; |
| 104 | case 64: *(*pp)++ = "-d"; break; |
| 105 | default: disorder_fatal(0, "cannot handle sample size %d", header->bits); |
| 106 | } |
| 107 | break; |
| 108 | case 1: |
| 109 | if(header->bits != 8 |
| 110 | && header->endian != ENDIAN_NATIVE) |
| 111 | switch(header->endian) { |
| 112 | case ENDIAN_BIG: *(*pp)++ = "-B"; break; |
| 113 | case ENDIAN_LITTLE: *(*pp)++ = "-L"; break; |
| 114 | } |
| 115 | if(header->bits % 8) |
| 116 | disorder_fatal(0, "cannot handle sample size %d", header->bits); |
| 117 | *qq += sprintf((char *)(*(*pp)++ = *qq), "-%d", header->bits / 8) + 1; |
| 118 | break; |
| 119 | default: |
| 120 | disorder_fatal(0, "unknown sox_generation %ld", config->sox_generation); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | int main(int argc, char attribute((unused)) **argv) { |
| 125 | struct stream_header header, latest_format; |
| 126 | int n, p[2], outfd = -1, logsyslog = !isatty(2); |
| 127 | pid_t pid = -1; |
| 128 | |
| 129 | set_progname(argv); |
| 130 | if(!setlocale(LC_CTYPE, "")) |
| 131 | disorder_fatal(errno, "error calling setlocale"); |
| 132 | while((n = getopt_long(argc, argv, "hVc:dDSs", options, 0)) >= 0) { |
| 133 | switch(n) { |
| 134 | case 'h': help(); |
| 135 | case 'V': version("disorder-normalize"); |
| 136 | case 'c': configfile = optarg; break; |
| 137 | case 'd': debugging = 1; break; |
| 138 | case 'D': debugging = 0; break; |
| 139 | case 'S': logsyslog = 0; break; |
| 140 | case 's': logsyslog = 1; break; |
| 141 | default: disorder_fatal(0, "invalid option"); |
| 142 | } |
| 143 | } |
| 144 | if(config_read(1, NULL)) |
| 145 | disorder_fatal(0, "cannot read configuration"); |
| 146 | if(logsyslog) { |
| 147 | openlog(progname, LOG_PID, LOG_DAEMON); |
| 148 | log_default = &log_syslog; |
| 149 | } |
| 150 | memset(&latest_format, 0, sizeof latest_format); |
| 151 | for(;;) { |
| 152 | n = 0; |
| 153 | while((size_t)n < sizeof header) { |
| 154 | int r = read(0, (char *)&header + n, sizeof header - n); |
| 155 | |
| 156 | if(r < 0) { |
| 157 | if(errno != EINTR) |
| 158 | disorder_fatal(errno, "error reading header"); |
| 159 | } else if(r == 0) { |
| 160 | if(n) |
| 161 | disorder_fatal(0, "EOF reading header"); |
| 162 | break; |
| 163 | } else |
| 164 | n += r; |
| 165 | } |
| 166 | if(!n) |
| 167 | break; |
| 168 | /* Sanity check the header */ |
| 169 | if(header.rate < 100 || header.rate > 1000000) |
| 170 | disorder_fatal(0, "implausible rate %"PRId32"Hz (%#"PRIx32")", |
| 171 | header.rate, header.rate); |
| 172 | if(header.channels < 1 || header.channels > 2) |
| 173 | disorder_fatal(0, "unsupported channel count %d", header.channels); |
| 174 | if(header.bits % 8 || !header.bits || header.bits > 64) |
| 175 | disorder_fatal(0, "unsupported sample size %d bits", header.bits); |
| 176 | if(header.endian != ENDIAN_BIG && header.endian != ENDIAN_LITTLE) |
| 177 | disorder_fatal(0, "unsupported byte order %x", header.bits); |
| 178 | /* Skip empty chunks regardless of their alleged format */ |
| 179 | if(header.nbytes == 0) |
| 180 | continue; |
| 181 | /* If the format has changed we stop/start the converter */ |
| 182 | if(!formats_equal(&header, &latest_format)) { |
| 183 | if(pid != -1) { |
| 184 | /* There's a running converter, stop it */ |
| 185 | xclose(outfd); |
| 186 | if(waitpid(pid, &n, 0) < 0) |
| 187 | disorder_fatal(errno, "error calling waitpid"); |
| 188 | if(n) |
| 189 | disorder_fatal(0, "sox failed: %#x", n); |
| 190 | pid = -1; |
| 191 | outfd = -1; |
| 192 | } |
| 193 | if(!formats_equal(&header, &config->sample_format)) { |
| 194 | const char *av[32], **pp = av; |
| 195 | char argbuf[1024], *q = argbuf; |
| 196 | |
| 197 | /* Input format doesn't match target, need to start a converter */ |
| 198 | *pp++ = "sox"; |
| 199 | soxargs(&pp, &q, &header); |
| 200 | *pp++ = "-"; /* stdin */ |
| 201 | soxargs(&pp, &q, &config->sample_format); |
| 202 | *pp++ = "-"; /* stdout */ |
| 203 | *pp = 0; |
| 204 | /* This pipe will be sox's stdin */ |
| 205 | xpipe(p); |
| 206 | if(!(pid = xfork())) { |
| 207 | exitfn = _exit; |
| 208 | xdup2(p[0], 0); |
| 209 | xclose(p[0]); |
| 210 | xclose(p[1]); |
| 211 | execvp(av[0], (char **)av); |
| 212 | disorder_fatal(errno, "sox"); |
| 213 | } |
| 214 | xclose(p[0]); |
| 215 | outfd = p[1]; |
| 216 | } else |
| 217 | /* Input format matches output, can just copy bytes */ |
| 218 | outfd = 1; |
| 219 | /* Remember current format for next iteration */ |
| 220 | latest_format = header; |
| 221 | } |
| 222 | /* Convert or copy this chunk */ |
| 223 | copy(0, outfd, header.nbytes); |
| 224 | } |
| 225 | if(outfd != -1) |
| 226 | xclose(outfd); |
| 227 | if(pid != -1) { |
| 228 | /* There's still a converter running */ |
| 229 | if(waitpid(pid, &n, 0) < 0) |
| 230 | disorder_fatal(errno, "error calling waitpid"); |
| 231 | if(n) |
| 232 | disorder_fatal(0, "sox failed: %#x", n); |
| 233 | } |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | Local Variables: |
| 239 | c-basic-offset:2 |
| 240 | comment-column:40 |
| 241 | fill-column:79 |
| 242 | indent-tabs-mode:nil |
| 243 | End: |
| 244 | */ |