gui: Only check STDIN for readability if curses is active.
[paraslash.git] / grab_client.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /**
20 * \file grab_client.c functions for grabbing the stream at any position
21 * in a filter chain
22 *
23 * \sa filter_chain filter_chain_info filter
24 */
25
26 #include "para.h"
27 #include "close_on_fork.h"
28 #include "grab_client.cmdline.h"
29 #include "list.h"
30 #include "filter.h"
31 #include "grab_client.h"
32 #include "audiod.h"
33 #include "error.h"
34 #include "string.h"
35
36
37 /** this maps the enum to the text used at the command line */
38 static const char *gc_modes[] = {
39 [GRAB_PEDANTIC] = "pedantic",
40 [GRAB_SLOPPY] = "sloppy",
41 [GRAB_AGGRESSIVE] = "aggressive",
42 NULL
43 };
44
45 /** grab clients that are not yet attached to a filter node */
46 struct list_head inactive_grab_client_list;
47
48 static int max_num_filters(void)
49 {
50 int i, ret = 0;
51 for (i = 0; audio_formats[i]; i++) {
52 PARA_INFO_LOG("%s filter chain length: %d\n", audio_formats[i],
53 num_filters(i));
54 ret = MAX(ret, num_filters(i));
55 }
56 PARA_INFO_LOG("maximal filter chain length: %d\n", ret);
57 return ret;
58 }
59
60 static int gc_write(char *buf, size_t len, struct filter_callback *fcb)
61 {
62 struct grab_client *gc = fcb->data;
63 struct timeval tv = {0, 100};
64 int ret;
65
66 // PARA_INFO_LOG("writing %d bytes to fd %d\n", len, gc->fd);
67 fd_set wfds;
68 do {
69 FD_ZERO(&wfds);
70 FD_SET(gc->fd, &wfds);
71 ret = select(gc->fd + 1, NULL, &wfds, NULL, &tv);
72 } while (ret == EAGAIN || ret == EINTR);
73 if (ret != 1) {
74 if (gc->mode == GRAB_PEDANTIC)
75 return -E_PEDANTIC_GRAB;
76 if (gc->mode == GRAB_SLOPPY)
77 return 1;
78 }
79 rewrite:
80 ret = write(gc->fd, buf, len);
81 if (ret < 0) {
82 ret = -E_GC_WRITE;
83 gc->error = E_GC_WRITE;
84 } else {
85 if (ret != len) {
86 if (gc->mode == GRAB_PEDANTIC)
87 return -E_PEDANTIC_GRAB;
88 if (gc->mode == GRAB_AGGRESSIVE) {
89 len -= ret;
90 memmove(buf, buf + ret, len);
91 goto rewrite;
92 }
93 }
94 }
95 return ret;
96 }
97
98 static int check_gc_args(struct grab_client *gc)
99 {
100 int i;
101 struct grab_client_args_info *conf = gc->conf;
102
103 PARA_INFO_LOG("filter_num: %d\n", gc->conf->filter_num_arg);
104 for (i = 0; gc_modes[i]; i++)
105 if (!strcmp(conf->mode_arg, gc_modes[i]))
106 break;
107 if (!gc_modes[i])
108 return -E_INVALID_GRAB_MODE;
109 gc->mode = i;
110 if (conf->audio_format_given) {
111 gc->audio_format_num = get_audio_format_num(conf->audio_format_arg);
112 if (gc->audio_format_num < 0)
113 return gc->audio_format_num;
114 }
115 if (conf->slot_arg > MAX_STREAM_SLOTS)
116 return -E_BAD_GC_SLOT;
117 if (conf->filter_num_arg <= 0)
118 return -E_BAD_GC_FILTER_NUM;
119 if (conf->audio_format_given) {
120 if (num_filters(gc->audio_format_num) < conf->filter_num_arg)
121 return -E_BAD_GC_FILTER_NUM;
122 } else
123 if (conf->filter_num_arg > max_num_filters())
124 return -E_BAD_GC_FILTER_NUM;
125
126 return 1;
127 }
128
129 static void add_inactive_gc(struct grab_client *gc)
130 {
131 PARA_INFO_LOG("adding grab client %p (fd %d) to inactive list\n",
132 gc, gc->fd);
133 list_add(&gc->node, &inactive_grab_client_list);
134 }
135
136 static void gc_free(struct grab_client *gc)
137 {
138 int i;
139
140 for (i = 0; i < gc->argc; i++)
141 free(gc->argv[i]);
142 free(gc->argv);
143 free(gc->conf);
144 free(gc);
145
146 }
147
148 static void gc_close(struct filter_callback *fcb)
149 {
150 struct grab_client *gc = fcb->data;
151
152 if (gc->conf->one_shot_given || gc->error) {
153 PARA_INFO_LOG("closing fd %d (grab client %p)\n", gc->fd, gc);
154 del_close_on_fork_list(gc->fd);
155 close(gc->fd);
156 gc_free(gc);
157 /* close on fork ?*/
158 return;
159 }
160 add_inactive_gc(gc);
161 }
162
163 /**
164 * move a grab client from the inactive list to a filter node
165 *
166 * \param gc the grab client to activate
167 * \param fn the filter node \a gc gets attached to
168 *
169 * \sa filter_node::callbacks, inactive_grab_client_list
170 */
171 void activate_grab_client(struct grab_client *gc, struct filter_node *fn)
172 {
173 PARA_INFO_LOG("activating %p (fd %d, filter node: %p)\n", gc, gc->fd, fn);
174 list_del(&gc->node);
175 list_add(&gc->fcb.node, &fn->callbacks);
176 }
177
178 /**
179 * activate inactive grab clients if possible
180 *
181 * \param slot audiod's slot for the new audio file
182 * \param audio_format_num the number of the audio format of the new audio file
183 * \param filter_list the list of activated filters for that new audio file
184 *
185 * This is called from audiod.c when the current audio file changes. It loops
186 * over all inactive grab clients and checks each grab client's configuration
187 * to determine if the client in question wishes to grab the new stream. If
188 * yes, this grab client is moved from the inactive grab client list to an
189 * appropriate filter_node.
190 *
191 * \sa filter_chain_info::filters, inactive_grab_client_list,
192 * activate_grab_client
193 */
194 void activate_inactive_grab_clients(int slot, int audio_format_num,
195 struct list_head *filter_list)
196 {
197 struct grab_client *gc, *tmp;
198 int i;
199 struct filter_node *fn;
200
201 list_for_each_entry_safe(gc, tmp, &inactive_grab_client_list, node) {
202 // PARA_INFO_LOG("checking inactive grab client %p\n", gc);
203 if (gc->conf->slot_arg >= 0 && gc->conf->slot_arg != slot)
204 continue;
205 if (gc->audio_format_num >= 0 && gc->audio_format_num !=
206 audio_format_num)
207 continue;
208 if (gc->conf->filter_num_arg >= 0 &&
209 num_filters(gc->audio_format_num)
210 < gc->conf->filter_num_arg)
211 continue;
212 i = 1;
213 list_for_each_entry(fn, filter_list, node) {
214 if (gc->conf->filter_num_arg <= 0
215 || i == gc->conf->filter_num_arg)
216 break;
217 i++;
218 }
219 activate_grab_client(gc, fn);
220 }
221 }
222
223 /**
224 * check the command line options and allocate a grab_client structure
225 *
226 * \param fd the file descriptor of the client
227 * \param argc the number of command line options
228 * \param argv pointers to the command line options
229 * \param err non-zero if an error occured
230 *
231 * If the command line options given by \a argc and \a argv are valid.
232 * allocate a struct grab_client and initialize it with this valid
233 * configuration. Moreover, add the new grab client to the inactive list.
234 *
235 * \return On success, this function returns a pointer to the newly created
236 * struct. On errors, it returns NULL and sets \a err appropriately.
237 *
238 * \sa grab_client, inactive_grab_client_list, activate_grab_client,
239 * filter_node::callbacks
240 */
241 /*
242 * argc, argv get freed when com_grab() returns, so we have to make a
243 * copy.
244 */
245 __malloc struct grab_client *grab_client_new(int fd, int argc, char **argv, int *err)
246 {
247 int i, ret;
248 struct grab_client *gc = para_calloc(sizeof(struct grab_client));
249
250 gc->conf = para_calloc(sizeof(struct grab_client_args_info));
251 gc->argc = argc;
252 gc->argv = para_calloc((argc + 1) * sizeof(char *));
253
254 for (i = 0; i < argc; i++) {
255 gc->argv[i] = para_strdup(argv[i]);
256 PARA_INFO_LOG("argc: %d, argv[%d]: %s\n", argc, i, gc->argv[i]);
257 }
258 PARA_INFO_LOG("argv[%d]: %s\n", argc, gc->argv[argc]);
259 ret = grab_client_cmdline_parser(gc->argc, gc->argv , gc->conf);
260 *err = -E_GC_SYNTAX;
261 if (ret)
262 goto err_out;
263 *err = -E_GC_HELP_GIVEN;
264 if (gc->conf->help_given)
265 goto err_out;
266 *err = check_gc_args(gc);
267 if (*err < 0)
268 goto err_out;
269 if (gc->conf->input_grab_given) {
270 gc->fcb.input_cb = gc_write;
271 gc->fcb.output_cb = NULL;
272 } else {
273 gc->fcb.output_cb = gc_write;
274 gc->fcb.input_cb = NULL;
275 }
276 gc->fd = fd;
277 gc->fcb.close = gc_close;
278 gc->fcb.data = gc;
279 add_inactive_gc(gc);
280 return gc;
281 err_out:
282 for (i = 0; i < argc; i++)
283 free(gc->argv[i]);
284 free(gc->argv);
285 free(gc->conf);
286 free(gc);
287 return NULL;
288 }
289
290 /** initialize the grabbing subsystem.
291 *
292 * This has to be called once during startup before any other function from
293 * grab_client.c may be used. It initializes \a inactive_grab_client_list.
294 */
295 void init_grabbing()
296 {
297 PARA_INFO_LOG("%s", "grab init\n");
298 INIT_LIST_HEAD(&inactive_grab_client_list);
299 }
300