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6d2d327c RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2007 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 2 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, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * 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, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
717ba987 | 20 | /** @file server/normalize.c |
6d2d327c RK |
21 | * @brief Convert "raw" format output to the configured format |
22 | * | |
23 | * Currently we invoke sox even for trivial conversions such as byte-swapping. | |
24 | * Ideally we would do all conversion including resampling in this one process | |
25 | * and eliminate the dependency on sox. | |
26 | */ | |
27 | ||
28 | #include <config.h> | |
29 | #include "types.h" | |
30 | ||
31 | #include <locale.h> | |
32 | #include <errno.h> | |
33 | #include <unistd.h> | |
34 | #include <syslog.h> | |
35 | #include <string.h> | |
36 | #include <sys/types.h> | |
37 | #include <sys/wait.h> | |
38 | ||
39 | #include "syscalls.h" | |
40 | #include "log.h" | |
41 | #include "configuration.h" | |
42 | #include "speaker-protocol.h" | |
43 | ||
44 | /** @brief Copy bytes from one file descriptor to another | |
45 | * @param infd File descriptor read from | |
46 | * @param outfd File descriptor to write to | |
47 | * @param n Number of bytes to copy | |
48 | */ | |
49 | static void copy(int infd, int outfd, size_t n) { | |
62234e45 | 50 | char buffer[4096]; |
51 | ssize_t written; | |
6d2d327c RK |
52 | |
53 | while(n > 0) { | |
62234e45 | 54 | const ssize_t readden = read(infd, buffer, |
55 | n > sizeof buffer ? sizeof buffer : n); | |
56 | if(readden < 0) { | |
6d2d327c RK |
57 | if(errno == EINTR) |
58 | continue; | |
59 | else | |
60 | fatal(errno, "read error"); | |
61 | } | |
62234e45 | 62 | if(readden == 0) |
6d2d327c | 63 | fatal(0, "unexpected EOF"); |
62234e45 | 64 | n -= readden; |
65 | written = 0; | |
66 | while(written < readden) { | |
67 | const ssize_t w = write(outfd, buffer + written, readden - written); | |
6d2d327c RK |
68 | if(w < 0) |
69 | fatal(errno, "write error"); | |
62234e45 | 70 | written += w; |
6d2d327c RK |
71 | } |
72 | } | |
73 | } | |
74 | ||
75 | static void soxargs(const char ***pp, char **qq, | |
76 | const struct stream_header *header) { | |
77 | *(*pp)++ = "-t.raw"; | |
78 | *(*pp)++ = "-s"; | |
79 | *qq += sprintf((char *)(*(*pp)++ = *qq), "-r%d", header->rate) + 1; | |
80 | *qq += sprintf((char *)(*(*pp)++ = *qq), "-c%d", header->channels) + 1; | |
81 | /* sox 12.17.9 insists on -b etc; CVS sox insists on -<n> etc; both are | |
82 | * deployed! */ | |
83 | switch(config->sox_generation) { | |
84 | case 0: | |
85 | if(header->bits != 8 | |
86 | && header->endian != ENDIAN_NATIVE) | |
87 | *(*pp)++ = "-x"; | |
88 | switch(header->bits) { | |
89 | case 8: *(*pp)++ = "-b"; break; | |
90 | case 16: *(*pp)++ = "-w"; break; | |
91 | case 32: *(*pp)++ = "-l"; break; | |
92 | case 64: *(*pp)++ = "-d"; break; | |
93 | default: fatal(0, "cannot handle sample size %d", header->bits); | |
94 | } | |
95 | break; | |
96 | case 1: | |
97 | if(header->bits != 8 | |
98 | && header->endian != ENDIAN_NATIVE) | |
99 | switch(header->endian) { | |
100 | case ENDIAN_BIG: *(*pp)++ = "-B"; break; | |
101 | case ENDIAN_LITTLE: *(*pp)++ = "-L"; break; | |
102 | } | |
103 | if(header->bits % 8) | |
104 | fatal(0, "cannot handle sample size %d", header->bits); | |
105 | *qq += sprintf((char *)(*(*pp)++ = *qq), "-%d", header->bits / 8) + 1; | |
106 | break; | |
107 | default: | |
108 | fatal(0, "unknown sox_generation %ld", config->sox_generation); | |
109 | } | |
110 | } | |
111 | ||
112 | int main(int argc, char attribute((unused)) **argv) { | |
113 | struct stream_header header, latest_format; | |
114 | int n, p[2], outfd = -1; | |
115 | pid_t pid = -1; | |
116 | ||
117 | set_progname(argv); | |
118 | if(!setlocale(LC_CTYPE, "")) | |
119 | fatal(errno, "error calling setlocale"); | |
120 | if(argc > 1) | |
121 | fatal(0, "not intended to be invoked by users"); | |
c00fce3a | 122 | if(config_read(1)) |
6d2d327c RK |
123 | fatal(0, "cannot read configuration"); |
124 | if(!isatty(2)) { | |
125 | openlog(progname, LOG_PID, LOG_DAEMON); | |
126 | log_default = &log_syslog; | |
127 | } | |
128 | memset(&latest_format, 0, sizeof latest_format); | |
129 | for(;;) { | |
e7fd1612 RK |
130 | n = 0; |
131 | while((size_t)n < sizeof header) { | |
132 | int r = read(0, (char *)&header + n, sizeof header - n); | |
133 | ||
134 | if(r < 0) { | |
135 | if(errno != EINTR) | |
136 | fatal(errno, "error reading header"); | |
e99d42b1 | 137 | } else if(r == 0) { |
138 | if(n) | |
139 | fatal(0, "EOF reading header"); | |
140 | break; | |
141 | } else | |
e7fd1612 RK |
142 | n += r; |
143 | } | |
24fc5e58 | 144 | if(!n) |
145 | break; | |
6d2d327c RK |
146 | /* Sanity check the header */ |
147 | if(header.rate < 100 || header.rate > 1000000) | |
148 | fatal(0, "implausible rate %"PRId32"Hz (%#"PRIx32")", | |
149 | header.rate, header.rate); | |
150 | if(header.channels < 1 || header.channels > 2) | |
151 | fatal(0, "unsupported channel count %d", header.channels); | |
152 | if(header.bits % 8 || !header.bits || header.bits > 64) | |
153 | fatal(0, "unsupported sample size %d bits", header.bits); | |
154 | if(header.endian != ENDIAN_BIG && header.endian != ENDIAN_LITTLE) | |
155 | fatal(0, "unsupported byte order %x", header.bits); | |
156 | /* Skip empty chunks regardless of their alleged format */ | |
157 | if(header.nbytes == 0) | |
158 | continue; | |
159 | /* If the format has changed we stop/start the converter */ | |
160 | if(!formats_equal(&header, &latest_format)) { | |
161 | if(pid != -1) { | |
162 | /* There's a running converter, stop it */ | |
163 | xclose(outfd); | |
164 | if(waitpid(pid, &n, 0) < 0) | |
165 | fatal(errno, "error calling waitpid"); | |
166 | if(n) | |
167 | fatal(0, "sox failed: %#x", n); | |
168 | pid = -1; | |
169 | outfd = -1; | |
170 | } | |
171 | if(!formats_equal(&header, &config->sample_format)) { | |
172 | const char *av[32], **pp = av; | |
173 | char argbuf[1024], *q = argbuf; | |
174 | ||
175 | /* Input format doesn't match target, need to start a converter */ | |
176 | *pp++ = "sox"; | |
177 | soxargs(&pp, &q, &header); | |
178 | *pp++ = "-"; /* stdin */ | |
179 | soxargs(&pp, &q, &config->sample_format); | |
180 | *pp++ = "-"; /* stdout */ | |
181 | *pp = 0; | |
182 | /* This pipe will be sox's stdin */ | |
183 | xpipe(p); | |
184 | if(!(pid = xfork())) { | |
185 | exitfn = _exit; | |
186 | xdup2(p[0], 0); | |
187 | xclose(p[0]); | |
188 | xclose(p[1]); | |
189 | execvp(av[0], (char **)av); | |
190 | fatal(errno, "sox"); | |
191 | } | |
192 | xclose(p[0]); | |
193 | outfd = p[1]; | |
194 | } else | |
195 | /* Input format matches output, can just copy bytes */ | |
196 | outfd = 1; | |
197 | /* Remember current format for next iteration */ | |
198 | latest_format = header; | |
199 | } | |
200 | /* Convert or copy this chunk */ | |
201 | copy(0, outfd, header.nbytes); | |
202 | } | |
203 | if(outfd != -1) | |
204 | xclose(outfd); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | /* | |
209 | Local Variables: | |
210 | c-basic-offset:2 | |
211 | comment-column:40 | |
212 | fill-column:79 | |
213 | indent-tabs-mode:nil | |
214 | End: | |
215 | */ |