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 "grab_client.cmdline.h"
31 #include "grab_client.h"
38 /** grab clients that are not yet attached to a filter node */
39 struct list_head inactive_grab_client_list
;
41 static int max_num_filters(void)
44 for (i
= 0; audio_formats
[i
]; i
++) {
45 PARA_INFO_LOG("%s filter chain length: %d\n", audio_formats
[i
],
47 ret
= PARA_MAX(ret
, num_filters(i
));
49 PARA_INFO_LOG("maximal filter chain length: %d\n", ret
);
53 static int gc_write(char *buf
, size_t len
, struct filter_callback
*fcb
)
55 struct grab_client
*gc
= fcb
->data
;
56 struct timeval tv
= {0, 100};
59 // PARA_INFO_LOG("writing %d bytes to fd %d\n", len, gc->fd);
62 FD_SET(gc
->fd
, &wfds
);
63 ret
= para_select(gc
->fd
+ 1, NULL
, &wfds
, &tv
);
65 if (gc
->mode
== GRAB_PEDANTIC
)
66 return -E_PEDANTIC_GRAB
;
67 if (gc
->mode
== GRAB_SLOPPY
)
71 ret
= write(gc
->fd
, buf
, len
);
74 gc
->error
= E_GC_WRITE
;
77 if (gc
->mode
== GRAB_PEDANTIC
)
78 return -E_PEDANTIC_GRAB
;
79 if (gc
->mode
== GRAB_AGGRESSIVE
) {
81 memmove(buf
, buf
+ ret
, len
);
89 /* TODO: gengetopt can handle the grab client modes */
90 static int check_gc_args(struct grab_client
*gc
)
93 struct grab_client_args_info
*c
= gc
->conf
;
94 char **mv
= grab_client_cmdline_parser_mode_values
;
96 PARA_INFO_LOG("filter_num: %d\n", c
->filter_num_arg
);
97 for (i
= 0; mv
[i
]; i
++)
98 if (!strcmp(c
->mode_arg
, mv
[i
]))
103 gc
->audio_format_num
= -1;
104 if (c
->audio_format_given
) {
105 gc
->audio_format_num
= get_audio_format_num(c
->audio_format_arg
);
106 if (gc
->audio_format_num
< 0)
107 return gc
->audio_format_num
;
109 if (c
->slot_arg
> MAX_STREAM_SLOTS
)
110 return -E_BAD_GC_SLOT
;
111 if (c
->filter_num_arg
<= 0)
112 return -E_BAD_GC_FILTER_NUM
;
113 if (c
->audio_format_given
) {
114 if (num_filters(gc
->audio_format_num
) < c
->filter_num_arg
)
115 return -E_BAD_GC_FILTER_NUM
;
117 if (c
->filter_num_arg
> max_num_filters())
118 return -E_BAD_GC_FILTER_NUM
;
123 static void add_inactive_gc(struct grab_client
*gc
)
125 PARA_INFO_LOG("adding grab client %p (fd %d) to inactive list\n",
127 para_list_add(&gc
->node
, &inactive_grab_client_list
);
130 static void gc_free(struct grab_client
*gc
)
134 for (i
= 0; i
< gc
->argc
; i
++)
142 static void gc_close(struct filter_callback
*fcb
)
144 struct grab_client
*gc
= fcb
->data
;
146 if (gc
->conf
->one_shot_given
|| gc
->error
) {
147 PARA_INFO_LOG("closing fd %d (grab client %p)\n", gc
->fd
, gc
);
157 * move a grab client from the inactive list to a filter node
159 * \param gc the grab client to activate
160 * \param fn the filter node \a gc gets attached to
162 * \sa filter_node::callbacks, inactive_grab_client_list
164 void activate_grab_client(struct grab_client
*gc
, struct filter_node
*fn
)
166 PARA_INFO_LOG("activating %p (fd %d, filter node: %p)\n", gc
, gc
->fd
, fn
);
168 para_list_add(&gc
->fcb
.node
, &fn
->callbacks
);
172 * activate inactive grab clients if possible
174 * \param slot_num audiod's slot for the new audio file
175 * \param audio_format_num the number of the audio format of the new audio file
176 * \param filter_list the list of activated filters for that new audio file
178 * This is called from audiod.c when the current audio file changes. It loops
179 * over all inactive grab clients and checks each grab client's configuration
180 * to determine if the client in question wishes to grab the new stream. If
181 * yes, this grab client is moved from the inactive grab client list to an
182 * appropriate filter_node.
184 * \sa filter_chain_info::filters, inactive_grab_client_list,
185 * activate_grab_client
187 void activate_inactive_grab_clients(int slot_num
, int audio_format_num
,
188 struct list_head
*filter_list
)
190 struct grab_client
*gc
, *tmp
;
192 struct filter_node
*fn
;
194 list_for_each_entry_safe(gc
, tmp
, &inactive_grab_client_list
, node
) {
195 // PARA_INFO_LOG("checking inactive grab client %p\n", gc);
196 if (gc
->conf
->slot_arg
>= 0 && gc
->conf
->slot_arg
!= slot_num
)
198 if (gc
->audio_format_num
>= 0 && gc
->audio_format_num
!=
201 if (gc
->conf
->filter_num_arg
>= 0 &&
202 num_filters(gc
->audio_format_num
)
203 < gc
->conf
->filter_num_arg
)
206 list_for_each_entry(fn
, filter_list
, node
) {
207 if (gc
->conf
->filter_num_arg
<= 0
208 || i
== gc
->conf
->filter_num_arg
)
212 activate_grab_client(gc
, fn
);
217 * check the command line options and allocate a grab_client structure
219 * \param fd the file descriptor of the client
220 * \param line the command line
221 * \param err non-zero if an error occured
223 * If the command line options given by \a argc and \a argv are valid.
224 * allocate a struct grab_client and initialize it with this valid
225 * configuration. Moreover, add the new grab client to the inactive list.
227 * \return On success, this function returns a pointer to the newly created
228 * struct. On errors, it returns NULL and sets \a err appropriately.
230 * \sa grab_client, inactive_grab_client_list, activate_grab_client,
231 * filter_node::callbacks
234 * argc, argv get freed when com_grab() returns, so we have to make a
237 struct grab_client
*grab_client_new(int fd
, char *line
, int *err
)
240 struct grab_client
*gc
= para_calloc(sizeof(struct grab_client
));
242 gc
->conf
= para_calloc(sizeof(struct grab_client_args_info
));
244 ret
= grab_client_cmdline_parser_string(line
, gc
->conf
, "grab");
248 *err
= -E_GC_HELP_GIVEN
;
249 if (gc
->conf
->help_given
)
251 *err
= -E_GC_VERSION_GIVEN
;
252 if (gc
->conf
->version_given
)
254 *err
= check_gc_args(gc
);
257 if (gc
->conf
->input_grab_given
) {
258 gc
->fcb
.input_cb
= gc_write
;
259 gc
->fcb
.output_cb
= NULL
;
261 gc
->fcb
.output_cb
= gc_write
;
262 gc
->fcb
.input_cb
= NULL
;
265 gc
->fcb
.close
= gc_close
;
275 /** initialize the grabbing subsystem.
277 * This has to be called once during startup before any other function from
278 * grab_client.c may be used. It initializes \a inactive_grab_client_list.
282 PARA_INFO_LOG("%s", "grab init\n");
283 INIT_LIST_HEAD(&inactive_grab_client_list
);