2 * This file is part of DisOrder
3 * Copyright (C) 2007 Richard Kettlewell
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.
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.
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
20 /** @file server/normalize.c
21 * @brief Convert "raw" format output to the configured format
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.
36 #include <sys/types.h>
41 #include "configuration.h"
42 #include "speaker-protocol.h"
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
49 static void copy(int infd
, int outfd
, size_t n
) {
54 const ssize_t readden
= read(infd
, buffer
,
55 n
> sizeof buffer ?
sizeof buffer
: n
);
60 fatal(errno
, "read error");
63 fatal(0, "unexpected EOF");
66 while(written
< readden
) {
67 const ssize_t w
= write(outfd
, buffer
+ written
, readden
- written
);
69 fatal(errno
, "write error");
75 static void soxargs(const char ***pp
, char **qq
,
76 const struct stream_header
*header
) {
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
83 switch(config
->sox_generation
) {
86 && header
->endian
!= ENDIAN_NATIVE
)
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
);
98 && header
->endian
!= ENDIAN_NATIVE
)
99 switch(header
->endian
) {
100 case ENDIAN_BIG
: *(*pp
)++ = "-B"; break;
101 case ENDIAN_LITTLE
: *(*pp
)++ = "-L"; break;
104 fatal(0, "cannot handle sample size %d", header
->bits
);
105 *qq
+= sprintf((char *)(*(*pp
)++ = *qq
), "-%d", header
->bits
/ 8) + 1;
108 fatal(0, "unknown sox_generation %ld", config
->sox_generation
);
112 int main(int argc
, char attribute((unused
)) **argv
) {
113 struct stream_header header
, latest_format
;
114 int n
, p
[2], outfd
= -1;
118 if(!setlocale(LC_CTYPE
, ""))
119 fatal(errno
, "error calling setlocale");
121 fatal(0, "not intended to be invoked by users");
123 fatal(0, "cannot read configuration");
125 openlog(progname
, LOG_PID
, LOG_DAEMON
);
126 log_default
= &log_syslog
;
128 memset(&latest_format
, 0, sizeof latest_format
);
131 while((size_t)n
< sizeof header
) {
132 int r
= read(0, (char *)&header
+ n
, sizeof header
- n
);
136 fatal(errno
, "error reading header");
139 fatal(0, "EOF reading header");
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)
159 /* If the format has changed we stop/start the converter */
160 if(!formats_equal(&header
, &latest_format
)) {
162 /* There's a running converter, stop it */
164 if(waitpid(pid
, &n
, 0) < 0)
165 fatal(errno
, "error calling waitpid");
167 fatal(0, "sox failed: %#x", n
);
171 if(!formats_equal(&header
, &config
->sample_format
)) {
172 const char *av
[32], **pp
= av
;
173 char argbuf
[1024], *q
= argbuf
;
175 /* Input format doesn't match target, need to start a converter */
177 soxargs(&pp
, &q
, &header
);
178 *pp
++ = "-"; /* stdin */
179 soxargs(&pp
, &q
, &config
->sample_format
);
180 *pp
++ = "-"; /* stdout */
182 /* This pipe will be sox's stdin */
184 if(!(pid
= xfork())) {
189 execvp(av
[0], (char **)av
);
195 /* Input format matches output, can just copy bytes */
197 /* Remember current format for next iteration */
198 latest_format
= header
;
200 /* Convert or copy this chunk */
201 copy(0, outfd
, header
.nbytes
);