2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
20 * \file grab_client.c functions for grabbing the stream at any position
23 * \sa filter_chain filter_chain_info filter
27 #include "close_on_fork.h"
28 #include "grab_client.cmdline.h"
31 #include "grab_client.h"
37 /** grab clients that are not yet attached to a filter node */
38 struct list_head inactive_grab_client_list
;
40 static int max_num_filters(void)
43 for (i
= 0; audio_formats
[i
]; i
++) {
44 PARA_INFO_LOG("%s filter chain length: %d\n", audio_formats
[i
],
46 ret
= MAX(ret
, num_filters(i
));
48 PARA_INFO_LOG("maximal filter chain length: %d\n", ret
);
52 static int gc_write(char *buf
, size_t len
, struct filter_callback
*fcb
)
54 struct grab_client
*gc
= fcb
->data
;
55 struct timeval tv
= {0, 100};
58 // PARA_INFO_LOG("writing %d bytes to fd %d\n", len, gc->fd);
61 FD_SET(gc
->fd
, &wfds
);
62 ret
= para_select(gc
->fd
+ 1, NULL
, &wfds
, &tv
);
64 if (gc
->mode
== GRAB_PEDANTIC
)
65 return -E_PEDANTIC_GRAB
;
66 if (gc
->mode
== GRAB_SLOPPY
)
70 ret
= write(gc
->fd
, buf
, len
);
73 gc
->error
= E_GC_WRITE
;
76 if (gc
->mode
== GRAB_PEDANTIC
)
77 return -E_PEDANTIC_GRAB
;
78 if (gc
->mode
== GRAB_AGGRESSIVE
) {
80 memmove(buf
, buf
+ ret
, len
);
88 static int check_gc_args(struct grab_client
*gc
)
91 struct grab_client_args_info
*conf
= gc
->conf
;
92 char **mv
= grab_client_cmdline_parser_mode_values
;
94 PARA_INFO_LOG("filter_num: %d\n", gc
->conf
->filter_num_arg
);
95 for (i
= 0; mv
[i
]; i
++)
96 if (!strcmp(conf
->mode_arg
, mv
[i
]))
99 if (conf
->audio_format_given
) {
100 gc
->audio_format_num
= get_audio_format_num(conf
->audio_format_arg
);
101 if (gc
->audio_format_num
< 0)
102 return gc
->audio_format_num
;
104 if (conf
->slot_arg
> MAX_STREAM_SLOTS
)
105 return -E_BAD_GC_SLOT
;
106 if (conf
->filter_num_arg
<= 0)
107 return -E_BAD_GC_FILTER_NUM
;
108 if (conf
->audio_format_given
) {
109 if (num_filters(gc
->audio_format_num
) < conf
->filter_num_arg
)
110 return -E_BAD_GC_FILTER_NUM
;
112 if (conf
->filter_num_arg
> max_num_filters())
113 return -E_BAD_GC_FILTER_NUM
;
118 static void add_inactive_gc(struct grab_client
*gc
)
120 PARA_INFO_LOG("adding grab client %p (fd %d) to inactive list\n",
122 list_add(&gc
->node
, &inactive_grab_client_list
);
125 static void gc_free(struct grab_client
*gc
)
129 for (i
= 0; i
< gc
->argc
; i
++)
137 static void gc_close(struct filter_callback
*fcb
)
139 struct grab_client
*gc
= fcb
->data
;
141 if (gc
->conf
->one_shot_given
|| gc
->error
) {
142 PARA_INFO_LOG("closing fd %d (grab client %p)\n", gc
->fd
, gc
);
143 del_close_on_fork_list(gc
->fd
);
153 * move a grab client from the inactive list to a filter node
155 * \param gc the grab client to activate
156 * \param fn the filter node \a gc gets attached to
158 * \sa filter_node::callbacks, inactive_grab_client_list
160 void activate_grab_client(struct grab_client
*gc
, struct filter_node
*fn
)
162 PARA_INFO_LOG("activating %p (fd %d, filter node: %p)\n", gc
, gc
->fd
, fn
);
164 list_add(&gc
->fcb
.node
, &fn
->callbacks
);
168 * activate inactive grab clients if possible
170 * \param slot audiod's slot for the new audio file
171 * \param audio_format_num the number of the audio format of the new audio file
172 * \param filter_list the list of activated filters for that new audio file
174 * This is called from audiod.c when the current audio file changes. It loops
175 * over all inactive grab clients and checks each grab client's configuration
176 * to determine if the client in question wishes to grab the new stream. If
177 * yes, this grab client is moved from the inactive grab client list to an
178 * appropriate filter_node.
180 * \sa filter_chain_info::filters, inactive_grab_client_list,
181 * activate_grab_client
183 void activate_inactive_grab_clients(int slot
, int audio_format_num
,
184 struct list_head
*filter_list
)
186 struct grab_client
*gc
, *tmp
;
188 struct filter_node
*fn
;
190 list_for_each_entry_safe(gc
, tmp
, &inactive_grab_client_list
, node
) {
191 // PARA_INFO_LOG("checking inactive grab client %p\n", gc);
192 if (gc
->conf
->slot_arg
>= 0 && gc
->conf
->slot_arg
!= slot
)
194 if (gc
->audio_format_num
>= 0 && gc
->audio_format_num
!=
197 if (gc
->conf
->filter_num_arg
>= 0 &&
198 num_filters(gc
->audio_format_num
)
199 < gc
->conf
->filter_num_arg
)
202 list_for_each_entry(fn
, filter_list
, node
) {
203 if (gc
->conf
->filter_num_arg
<= 0
204 || i
== gc
->conf
->filter_num_arg
)
208 activate_grab_client(gc
, fn
);
213 * check the command line options and allocate a grab_client structure
215 * \param fd the file descriptor of the client
216 * \param argc the number of command line options
217 * \param argv pointers to the command line options
218 * \param err non-zero if an error occured
220 * If the command line options given by \a argc and \a argv are valid.
221 * allocate a struct grab_client and initialize it with this valid
222 * configuration. Moreover, add the new grab client to the inactive list.
224 * \return On success, this function returns a pointer to the newly created
225 * struct. On errors, it returns NULL and sets \a err appropriately.
227 * \sa grab_client, inactive_grab_client_list, activate_grab_client,
228 * filter_node::callbacks
231 * argc, argv get freed when com_grab() returns, so we have to make a
234 __malloc
struct grab_client
*grab_client_new(int fd
, int argc
, char **argv
, int *err
)
237 struct grab_client
*gc
= para_calloc(sizeof(struct grab_client
));
239 gc
->conf
= para_calloc(sizeof(struct grab_client_args_info
));
241 gc
->argv
= para_calloc((argc
+ 1) * sizeof(char *));
243 for (i
= 0; i
< argc
; i
++) {
244 gc
->argv
[i
] = para_strdup(argv
[i
]);
245 PARA_INFO_LOG("argc: %d, argv[%d]: %s\n", argc
, i
, gc
->argv
[i
]);
247 PARA_INFO_LOG("argv[%d]: %s\n", argc
, gc
->argv
[argc
]);
248 ret
= grab_client_cmdline_parser(gc
->argc
, gc
->argv
, gc
->conf
);
252 *err
= -E_GC_HELP_GIVEN
;
253 if (gc
->conf
->help_given
)
255 *err
= -E_GC_VERSION_GIVEN
;
256 if (gc
->conf
->version_given
)
258 *err
= check_gc_args(gc
);
261 if (gc
->conf
->input_grab_given
) {
262 gc
->fcb
.input_cb
= gc_write
;
263 gc
->fcb
.output_cb
= NULL
;
265 gc
->fcb
.output_cb
= gc_write
;
266 gc
->fcb
.input_cb
= NULL
;
269 gc
->fcb
.close
= gc_close
;
274 for (i
= 0; i
< argc
; i
++)
282 /** initialize the grabbing subsystem.
284 * This has to be called once during startup before any other function from
285 * grab_client.c may be used. It initializes \a inactive_grab_client_list.
289 PARA_INFO_LOG("%s", "grab init\n");
290 INIT_LIST_HEAD(&inactive_grab_client_list
);