460b9539 |
1 | |
2 | /* |
3 | * This file is part of DisOrder. |
4 | * Copyright (C) 2005 Richard Kettlewell |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, but |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
19 | * USA |
20 | */ |
21 | |
22 | #include <config.h> |
23 | |
24 | #include <string.h> |
25 | #include <stdlib.h> |
26 | #include <errno.h> |
27 | #include <unistd.h> |
28 | #include <poll.h> |
29 | #include <ao/ao.h> |
30 | #include <ao/plugin.h> |
31 | |
32 | /* extra declarations to help out lazy <ao/plugin.h> */ |
33 | int ao_plugin_test(void); |
34 | ao_info *ao_plugin_driver_info(void); |
35 | char *ao_plugin_file_extension(void); |
36 | |
37 | /* private data structure for this driver */ |
38 | struct internal { |
39 | int fd; /* output file descriptor */ |
40 | int exit_on_error; /* exit on write error */ |
41 | }; |
42 | |
43 | /* like write() but never returns EINTR/EAGAIN or short */ |
44 | static int do_write(int fd, const void *ptr, size_t n) { |
45 | size_t written = 0; |
46 | int ret; |
47 | struct pollfd ufd; |
48 | |
49 | memset(&ufd, 0, sizeof ufd); |
50 | ufd.fd = fd; |
51 | ufd.events = POLLOUT; |
52 | while(written < n) { |
53 | ret = write(fd, (const char *)ptr + written, n - written); |
54 | if(ret < 0) { |
55 | switch(errno) { |
56 | case EINTR: break; |
57 | case EAGAIN: |
58 | /* Someone sneakily gave us a nonblocking file descriptor, wait until |
59 | * we can write again */ |
60 | ret = poll(&ufd, 1, -1); |
61 | if(ret < 0 && errno != EINTR) return -1; |
62 | break; |
63 | default: |
64 | return -1; |
65 | } |
66 | } else |
67 | written += ret; |
68 | } |
69 | return written; |
70 | } |
71 | |
72 | /* return 1 if this driver can be opened */ |
73 | int ao_plugin_test(void) { |
74 | return 1; |
75 | } |
76 | |
77 | /* return info about this driver */ |
78 | ao_info *ao_plugin_driver_info(void) { |
79 | static const char *options[] = { "fd" }; |
80 | static const ao_info info = { |
81 | AO_TYPE_LIVE, /* type */ |
82 | (char *)"DisOrder format driver", /* name */ |
83 | (char *)"disorder", /* short_name */ |
84 | (char *)"http://www.greenend.org.uk/rjk/disorder/", /* comment */ |
85 | (char *)"Richard Kettlewell", /* author */ |
86 | AO_FMT_NATIVE, /* preferred_byte_format */ |
87 | 0, /* priority */ |
88 | (char **)options, /* options */ |
89 | 1, /* option_count */ |
90 | }; |
91 | return (ao_info *)&info; |
92 | } |
93 | |
94 | /* initialize the private data structure */ |
95 | int ao_plugin_device_init(ao_device *device) { |
96 | struct internal *i = malloc(sizeof (struct internal)); |
97 | const char *e; |
98 | |
99 | if(!i) return 0; |
100 | memset(i, 0, sizeof *i); |
101 | if((e = getenv("DISORDER_RAW_FD"))) |
102 | i->fd = atoi(e); |
103 | else |
104 | i->fd = 1; |
105 | device->internal = i; |
106 | return 1; |
107 | } |
108 | |
109 | /* set an option */ |
110 | int ao_plugin_set_option(ao_device *device, |
111 | const char *key, |
112 | const char *value) { |
113 | struct internal *i = device->internal; |
114 | |
115 | if(!strcmp(key, "fd")) |
116 | i->fd = atoi(value); |
117 | else if(!strcmp(key, "fragile")) |
118 | i->exit_on_error = atoi(value); |
119 | /* unknown options are required to be ignored */ |
120 | return 1; |
121 | } |
122 | |
123 | /* open the device */ |
124 | int ao_plugin_open(ao_device *device, ao_sample_format *format) { |
125 | struct internal *i = device->internal; |
126 | |
127 | /* we would like native-order samples */ |
128 | device->driver_byte_format = AO_FMT_NATIVE; |
129 | if(do_write(i->fd, format, sizeof *format) < 0) { |
130 | if(i->exit_on_error) exit(-1); |
131 | return 0; |
132 | } |
133 | return 1; |
134 | } |
135 | |
136 | /* play some samples */ |
137 | int ao_plugin_play(ao_device *device, const char *output_samples, |
138 | uint_32 num_bytes) { |
139 | struct internal *i = device->internal; |
140 | |
141 | if(do_write(i->fd, output_samples, num_bytes) < 0) { |
142 | if(i->exit_on_error) _exit(-1); |
143 | return 0; |
144 | } |
145 | return 1; |
146 | } |
147 | |
148 | /* close the device */ |
149 | int ao_plugin_close(ao_device attribute((unused)) *device) { |
150 | return 1; |
151 | } |
152 | |
153 | /* delete private data structures */ |
154 | void ao_plugin_device_clear(ao_device *device) { |
155 | free(device->internal); |
156 | device->internal = 0; |
157 | } |
158 | |
159 | /* report preferred filename extension */ |
160 | char *ao_plugin_file_extension(void) { |
161 | return 0; |
162 | } |
163 | |
164 | /* |
165 | Local Variables: |
166 | c-basic-offset:2 |
167 | comment-column:40 |
168 | End: |
169 | */ |