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 | |
05b75f8d | 27 | #include "common.h" |
460b9539 | 28 | |
460b9539 | 29 | #include <errno.h> |
30 | #include <unistd.h> | |
31 | #include <poll.h> | |
32 | #include <ao/ao.h> | |
33 | #include <ao/plugin.h> | |
34 | ||
6d2d327c RK |
35 | #include "speaker-protocol.h" |
36 | ||
460b9539 | 37 | /* extra declarations to help out lazy <ao/plugin.h> */ |
38 | int ao_plugin_test(void); | |
39 | ao_info *ao_plugin_driver_info(void); | |
40 | char *ao_plugin_file_extension(void); | |
41 | ||
6d2d327c | 42 | /** @brief Private data structure for this driver */ |
460b9539 | 43 | struct internal { |
44 | int fd; /* output file descriptor */ | |
45 | int exit_on_error; /* exit on write error */ | |
6d2d327c RK |
46 | |
47 | /** @brief Record of sample format */ | |
48 | struct stream_header header; | |
49 | ||
460b9539 | 50 | }; |
51 | ||
52 | /* like write() but never returns EINTR/EAGAIN or short */ | |
53 | static int do_write(int fd, const void *ptr, size_t n) { | |
54 | size_t written = 0; | |
55 | int ret; | |
56 | struct pollfd ufd; | |
57 | ||
58 | memset(&ufd, 0, sizeof ufd); | |
59 | ufd.fd = fd; | |
60 | ufd.events = POLLOUT; | |
61 | while(written < n) { | |
62 | ret = write(fd, (const char *)ptr + written, n - written); | |
63 | if(ret < 0) { | |
64 | switch(errno) { | |
65 | case EINTR: break; | |
66 | case EAGAIN: | |
67 | /* Someone sneakily gave us a nonblocking file descriptor, wait until | |
68 | * we can write again */ | |
69 | ret = poll(&ufd, 1, -1); | |
70 | if(ret < 0 && errno != EINTR) return -1; | |
71 | break; | |
72 | default: | |
73 | return -1; | |
74 | } | |
75 | } else | |
76 | written += ret; | |
77 | } | |
78 | return written; | |
79 | } | |
80 | ||
81 | /* return 1 if this driver can be opened */ | |
82 | int ao_plugin_test(void) { | |
83 | return 1; | |
84 | } | |
85 | ||
86 | /* return info about this driver */ | |
87 | ao_info *ao_plugin_driver_info(void) { | |
88 | static const char *options[] = { "fd" }; | |
89 | static const ao_info info = { | |
90 | AO_TYPE_LIVE, /* type */ | |
91 | (char *)"DisOrder format driver", /* name */ | |
92 | (char *)"disorder", /* short_name */ | |
93 | (char *)"http://www.greenend.org.uk/rjk/disorder/", /* comment */ | |
94 | (char *)"Richard Kettlewell", /* author */ | |
95 | AO_FMT_NATIVE, /* preferred_byte_format */ | |
96 | 0, /* priority */ | |
97 | (char **)options, /* options */ | |
98 | 1, /* option_count */ | |
99 | }; | |
100 | return (ao_info *)&info; | |
101 | } | |
102 | ||
103 | /* initialize the private data structure */ | |
104 | int ao_plugin_device_init(ao_device *device) { | |
105 | struct internal *i = malloc(sizeof (struct internal)); | |
106 | const char *e; | |
107 | ||
108 | if(!i) return 0; | |
109 | memset(i, 0, sizeof *i); | |
110 | if((e = getenv("DISORDER_RAW_FD"))) | |
111 | i->fd = atoi(e); | |
112 | else | |
113 | i->fd = 1; | |
114 | device->internal = i; | |
115 | return 1; | |
116 | } | |
117 | ||
118 | /* set an option */ | |
119 | int ao_plugin_set_option(ao_device *device, | |
120 | const char *key, | |
121 | const char *value) { | |
122 | struct internal *i = device->internal; | |
123 | ||
124 | if(!strcmp(key, "fd")) | |
125 | i->fd = atoi(value); | |
126 | else if(!strcmp(key, "fragile")) | |
127 | i->exit_on_error = atoi(value); | |
128 | /* unknown options are required to be ignored */ | |
129 | return 1; | |
130 | } | |
131 | ||
132 | /* open the device */ | |
133 | int ao_plugin_open(ao_device *device, ao_sample_format *format) { | |
134 | struct internal *i = device->internal; | |
135 | ||
136 | /* we would like native-order samples */ | |
137 | device->driver_byte_format = AO_FMT_NATIVE; | |
6d2d327c RK |
138 | i->header.rate = format->rate; |
139 | i->header.channels = format->channels; | |
140 | i->header.bits = format->bits; | |
141 | i->header.endian = ENDIAN_NATIVE; | |
460b9539 | 142 | return 1; |
143 | } | |
144 | ||
145 | /* play some samples */ | |
146 | int ao_plugin_play(ao_device *device, const char *output_samples, | |
147 | uint_32 num_bytes) { | |
148 | struct internal *i = device->internal; | |
149 | ||
6d2d327c RK |
150 | /* Fill in and write the header */ |
151 | i->header.nbytes = num_bytes; | |
152 | if(do_write(i->fd, &i->header, sizeof i->header) < 0) { | |
153 | if(i->exit_on_error) _exit(-1); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* Write the sample data */ | |
460b9539 | 158 | if(do_write(i->fd, output_samples, num_bytes) < 0) { |
159 | if(i->exit_on_error) _exit(-1); | |
160 | return 0; | |
161 | } | |
162 | return 1; | |
163 | } | |
164 | ||
165 | /* close the device */ | |
166 | int ao_plugin_close(ao_device attribute((unused)) *device) { | |
167 | return 1; | |
168 | } | |
169 | ||
170 | /* delete private data structures */ | |
171 | void ao_plugin_device_clear(ao_device *device) { | |
172 | free(device->internal); | |
173 | device->internal = 0; | |
174 | } | |
175 | ||
176 | /* report preferred filename extension */ | |
177 | char *ao_plugin_file_extension(void) { | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /* | |
182 | Local Variables: | |
183 | c-basic-offset:2 | |
184 | comment-column:40 | |
185 | End: | |
186 | */ |