Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder. | |
6d2d327c | 3 | * Copyright (C) 2005, 2007 Richard Kettlewell |
460b9539 | 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 | */ | |
6d2d327c RK |
20 | /** @file driver/disorder.c |
21 | * @brief libao driver used by DisOrder | |
22 | * | |
23 | * The output from this driver is expected to be fed to @c | |
24 | * disorder-normalize to convert to the confnigured target format. | |
25 | */ | |
460b9539 | 26 | |
27 | #include <config.h> | |
6d2d327c | 28 | #include "types.h" |
460b9539 | 29 | |
30 | #include <string.h> | |
31 | #include <stdlib.h> | |
32 | #include <errno.h> | |
33 | #include <unistd.h> | |
34 | #include <poll.h> | |
35 | #include <ao/ao.h> | |
36 | #include <ao/plugin.h> | |
37 | ||
6d2d327c RK |
38 | #include "speaker-protocol.h" |
39 | ||
460b9539 | 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); | |
44 | ||
6d2d327c | 45 | /** @brief Private data structure for this driver */ |
460b9539 | 46 | struct internal { |
47 | int fd; /* output file descriptor */ | |
48 | int exit_on_error; /* exit on write error */ | |
6d2d327c RK |
49 | |
50 | /** @brief Record of sample format */ | |
51 | struct stream_header header; | |
52 | ||
460b9539 | 53 | }; |
54 | ||
55 | /* like write() but never returns EINTR/EAGAIN or short */ | |
56 | static int do_write(int fd, const void *ptr, size_t n) { | |
57 | size_t written = 0; | |
58 | int ret; | |
59 | struct pollfd ufd; | |
60 | ||
61 | memset(&ufd, 0, sizeof ufd); | |
62 | ufd.fd = fd; | |
63 | ufd.events = POLLOUT; | |
64 | while(written < n) { | |
65 | ret = write(fd, (const char *)ptr + written, n - written); | |
66 | if(ret < 0) { | |
67 | switch(errno) { | |
68 | case EINTR: break; | |
69 | case EAGAIN: | |
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; | |
74 | break; | |
75 | default: | |
76 | return -1; | |
77 | } | |
78 | } else | |
79 | written += ret; | |
80 | } | |
81 | return written; | |
82 | } | |
83 | ||
84 | /* return 1 if this driver can be opened */ | |
85 | int ao_plugin_test(void) { | |
86 | return 1; | |
87 | } | |
88 | ||
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 */ | |
99 | 0, /* priority */ | |
100 | (char **)options, /* options */ | |
101 | 1, /* option_count */ | |
102 | }; | |
103 | return (ao_info *)&info; | |
104 | } | |
105 | ||
106 | /* initialize the private data structure */ | |
107 | int ao_plugin_device_init(ao_device *device) { | |
108 | struct internal *i = malloc(sizeof (struct internal)); | |
109 | const char *e; | |
110 | ||
111 | if(!i) return 0; | |
112 | memset(i, 0, sizeof *i); | |
113 | if((e = getenv("DISORDER_RAW_FD"))) | |
114 | i->fd = atoi(e); | |
115 | else | |
116 | i->fd = 1; | |
117 | device->internal = i; | |
118 | return 1; | |
119 | } | |
120 | ||
121 | /* set an option */ | |
122 | int ao_plugin_set_option(ao_device *device, | |
123 | const char *key, | |
124 | const char *value) { | |
125 | struct internal *i = device->internal; | |
126 | ||
127 | if(!strcmp(key, "fd")) | |
128 | i->fd = atoi(value); | |
129 | else if(!strcmp(key, "fragile")) | |
130 | i->exit_on_error = atoi(value); | |
131 | /* unknown options are required to be ignored */ | |
132 | return 1; | |
133 | } | |
134 | ||
135 | /* open the device */ | |
136 | int ao_plugin_open(ao_device *device, ao_sample_format *format) { | |
137 | struct internal *i = device->internal; | |
138 | ||
139 | /* we would like native-order samples */ | |
140 | device->driver_byte_format = AO_FMT_NATIVE; | |
6d2d327c RK |
141 | i->header.rate = format->rate; |
142 | i->header.channels = format->channels; | |
143 | i->header.bits = format->bits; | |
144 | i->header.endian = ENDIAN_NATIVE; | |
460b9539 | 145 | return 1; |
146 | } | |
147 | ||
148 | /* play some samples */ | |
149 | int ao_plugin_play(ao_device *device, const char *output_samples, | |
150 | uint_32 num_bytes) { | |
151 | struct internal *i = device->internal; | |
152 | ||
6d2d327c RK |
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); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /* Write the sample data */ | |
460b9539 | 161 | if(do_write(i->fd, output_samples, num_bytes) < 0) { |
162 | if(i->exit_on_error) _exit(-1); | |
163 | return 0; | |
164 | } | |
165 | return 1; | |
166 | } | |
167 | ||
168 | /* close the device */ | |
169 | int ao_plugin_close(ao_device attribute((unused)) *device) { | |
170 | return 1; | |
171 | } | |
172 | ||
173 | /* delete private data structures */ | |
174 | void ao_plugin_device_clear(ao_device *device) { | |
175 | free(device->internal); | |
176 | device->internal = 0; | |
177 | } | |
178 | ||
179 | /* report preferred filename extension */ | |
180 | char *ao_plugin_file_extension(void) { | |
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
185 | Local Variables: | |
186 | c-basic-offset:2 | |
187 | comment-column:40 | |
188 | End: | |
189 | */ |