2 * This file is part of DisOrder.
3 * Copyright (C) 2005, 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 driver/disorder.c
21 * @brief libao driver used by DisOrder
23 * The output from this driver is expected to be fed to @c
24 * disorder-normalize to convert to the confnigured target format.
36 #include <ao/plugin.h>
38 #include "speaker-protocol.h"
40 /* extra declarations to help out lazy <ao/plugin.h> */
41 int ao_plugin_test(void);
42 ao_info
*ao_plugin_driver_info(void);
43 char *ao_plugin_file_extension(void);
45 /** @brief Private data structure for this driver */
47 int fd
; /* output file descriptor */
48 int exit_on_error
; /* exit on write error */
50 /** @brief Record of sample format */
51 struct stream_header header
;
55 /* like write() but never returns EINTR/EAGAIN or short */
56 static int do_write(int fd
, const void *ptr
, size_t n
) {
61 memset(&ufd
, 0, sizeof ufd
);
65 ret
= write(fd
, (const char *)ptr
+ written
, n
- written
);
70 /* Someone sneakily gave us a nonblocking file descriptor, wait until
71 * we can write again */
72 ret
= poll(&ufd
, 1, -1);
73 if(ret
< 0 && errno
!= EINTR
) return -1;
84 /* return 1 if this driver can be opened */
85 int ao_plugin_test(void) {
89 /* return info about this driver */
90 ao_info
*ao_plugin_driver_info(void) {
91 static const char *options
[] = { "fd" };
92 static const ao_info info
= {
93 AO_TYPE_LIVE
, /* type */
94 (char *)"DisOrder format driver", /* name */
95 (char *)"disorder", /* short_name */
96 (char *)"http://www.greenend.org.uk/rjk/disorder/", /* comment */
97 (char *)"Richard Kettlewell", /* author */
98 AO_FMT_NATIVE
, /* preferred_byte_format */
100 (char **)options
, /* options */
101 1, /* option_count */
103 return (ao_info
*)&info
;
106 /* initialize the private data structure */
107 int ao_plugin_device_init(ao_device
*device
) {
108 struct internal
*i
= malloc(sizeof (struct internal
));
112 memset(i
, 0, sizeof *i
);
113 if((e
= getenv("DISORDER_RAW_FD")))
117 device
->internal
= i
;
122 int ao_plugin_set_option(ao_device
*device
,
125 struct internal
*i
= device
->internal
;
127 if(!strcmp(key
, "fd"))
129 else if(!strcmp(key
, "fragile"))
130 i
->exit_on_error
= atoi(value
);
131 /* unknown options are required to be ignored */
135 /* open the device */
136 int ao_plugin_open(ao_device
*device
, ao_sample_format
*format
) {
137 struct internal
*i
= device
->internal
;
139 /* we would like native-order samples */
140 device
->driver_byte_format
= AO_FMT_NATIVE
;
141 i
->header
.rate
= format
->rate
;
142 i
->header
.channels
= format
->channels
;
143 i
->header
.bits
= format
->bits
;
144 i
->header
.endian
= ENDIAN_NATIVE
;
148 /* play some samples */
149 int ao_plugin_play(ao_device
*device
, const char *output_samples
,
151 struct internal
*i
= device
->internal
;
153 /* Fill in and write the header */
154 i
->header
.nbytes
= num_bytes
;
155 if(do_write(i
->fd
, &i
->header
, sizeof i
->header
) < 0) {
156 if(i
->exit_on_error
) _exit(-1);
160 /* Write the sample data */
161 if(do_write(i
->fd
, output_samples
, num_bytes
) < 0) {
162 if(i
->exit_on_error
) _exit(-1);
168 /* close the device */
169 int ao_plugin_close(ao_device
attribute((unused
)) *device
) {
173 /* delete private data structures */
174 void ao_plugin_device_clear(ao_device
*device
) {
175 free(device
->internal
);
176 device
->internal
= 0;
179 /* report preferred filename extension */
180 char *ao_plugin_file_extension(void) {