2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
8 * \file grab_client.c Functions for grabbing the stream at any position
11 * \sa filter_chain filter_chain_info filter.
15 #include <sys/types.h>
23 #include "grab_client.h"
29 /** Grab clients that are not yet attached to a filter node. */
30 static struct list_head inactive_grab_client_list;
32 static int max_num_filters(void)
36 for (i = 0; audio_formats[i]; i++) {
37 PARA_INFO_LOG("%s filter chain length: %d\n", audio_formats[i],
39 ret = PARA_MAX(ret, num_filters(i));
41 PARA_INFO_LOG("maximal filter chain length: %d\n", ret);
45 static struct filter_node *find_filter_node(int format, int filternum)
50 struct slot_info *s = &slot[i];
51 if (s->format < 0 || !s->fc)
53 if (format >= 0 && s->format != format)
55 if (num_filters(i) <= filternum)
58 return s->fc->filter_nodes + filternum;
63 static int gc_write(char *buf, size_t len, struct filter_callback *fcb)
65 struct grab_client *gc = container_of(fcb, struct grab_client, fcb);
68 while (written < len) {
69 int ret = write_ok(gc->fd);
72 if (ret == 0) { /* fd not ready */
73 if (gc->mode == GM_PEDANTIC)
75 if (gc->mode == GM_SLOPPY)
78 ret = write(gc->fd, buf + written, len - written);
80 if (errno != EAGAIN && errno != EINTR)
82 if (gc->mode == GM_PEDANTIC)
84 if (gc->mode == GM_SLOPPY)
91 gc->error = -E_GC_WRITE;
95 static void add_inactive_gc(struct grab_client *gc)
97 PARA_INFO_LOG("adding grab client %p (fd %d) to inactive list\n",
99 para_list_add(&gc->node, &inactive_grab_client_list);
102 static void gc_close(struct filter_callback *fcb)
104 struct grab_client *gc = container_of(fcb, struct grab_client, fcb);
106 if ((gc->flags & GF_ONE_SHOT) || gc->error < 0) {
107 PARA_INFO_LOG("closing fd %d (grab client %p)\n", gc->fd, gc);
116 * Move a grab client from the inactive list to a filter node.
118 * \param gc The grab client to activate.
119 * \param fn The filter node \a gc gets attached to.
121 * \sa filter_node::callbacks, inactive_grab_client_list.
123 void activate_grab_client(struct grab_client *gc, struct filter_node *fn)
125 PARA_INFO_LOG("activating %p (fd %d, filter node: %p)\n", gc, gc->fd, fn);
127 para_list_add(&gc->fcb.node, &fn->callbacks);
131 * Activate inactive grab clients if possible.
133 * \param audio_format_num The number of the audio format of the new audio file.
134 * \param fc The filter chain containing the activated filters.
136 * This is called from audiod.c when the current audio file changes. It loops
137 * over all inactive grab clients and checks each grab client's configuration
138 * to determine if the client in question wishes to grab the new stream. If
139 * yes, this grab client is moved from the inactive grab client list to an
140 * appropriate filter_node.
142 * \sa filter_chain_info::filters, inactive_grab_client_list,
143 * activate_grab_client.
145 void activate_inactive_grab_clients(int audio_format_num,
146 struct filter_chain *fc)
148 struct grab_client *gc, *tmp;
149 struct filter_node *fn;
151 list_for_each_entry_safe(gc, tmp, &inactive_grab_client_list, node) {
152 if (gc->audio_format_num >= 0 && gc->audio_format_num !=
155 if (gc->filter_num >= num_filters(audio_format_num))
157 fn = fc->filter_nodes + gc->filter_num;
158 activate_grab_client(gc, fn);
162 static int check_gc_args(int argc, char **argv, struct grab_client *gc)
166 gc->audio_format_num = -1; /* default: grab any audio format */
167 for (i = 1; i < argc; i++) {
168 const char *arg = argv[i];
171 if (!strcmp(arg, "--")) {
175 if (!strncmp(arg, "-n=", 3)) {
176 ret = para_atoi32(arg + 3, &gc->filter_num);
179 if (gc->filter_num < 0)
180 return -E_BAD_GC_FILTER_NUM;
181 if (gc->filter_num >= max_num_filters())
182 return -E_BAD_GC_FILTER_NUM;
185 if (!strncmp(arg, "-m", 2)) {
190 gc->mode = GM_SLOPPY;
193 gc->mode = GM_AGGRESSIVE;
196 gc->mode = GM_PEDANTIC;
202 if (!strcmp(arg, "-i")) {
203 gc->flags |= GF_INPUT_GRAB;
206 if (!strcmp(arg, "-o")) {
207 gc->flags |= GF_ONE_SHOT;
210 if (!strncmp(arg, "-f=", 3)) {
211 ret = get_audio_format_num(arg + 3);
214 gc->audio_format_num = ret;
225 * Check the command line options and allocate a grab_client structure.
227 * \param fd The file descriptor of the client.
228 * \param argc Argument count.
229 * \param argv Argument vector.
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.
237 * \sa grab_client, inactive_grab_client_list, activate_grab_client,
238 * filter_node::callbacks.
240 int grab_client_new(int fd, int argc, char **argv)
243 struct grab_client *gc = para_calloc(sizeof(struct grab_client));
244 struct filter_node *fn;
246 ret = check_gc_args(argc, argv, gc);
249 if (gc->flags & GF_INPUT_GRAB)
250 gc->fcb.input_cb = gc_write;
252 gc->fcb.output_cb = gc_write;
254 gc->fcb.close = gc_close;
255 fn = find_filter_node(gc->audio_format_num, gc->filter_num);
257 para_list_add(&gc->fcb.node, &fn->callbacks);
267 * Initialize the grabbing subsystem.
269 * This has to be called once during startup before any other function from
270 * grab_client.c may be used. It initializes \a inactive_grab_client_list.
272 void init_grabbing(void)
274 PARA_INFO_LOG("grab init\n");
275 INIT_LIST_HEAD(&inactive_grab_client_list);