/*
- * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
-/**
- * \file grab_client.c Functions for grabbing the stream at any position
- * in a filter chain.
- *
- * \sa filter_chain filter_chain_info filter.
- */
+/** \file grab_client.c Functions for grabbing the audio stream. */
#include <regex.h>
#include <sys/types.h>
#include <dirent.h>
+#include <stdbool.h>
#include "para.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
+#include "buffer_tree.h"
#include "filter.h"
#include "grab_client.h"
#include "audiod.h"
#include "string.h"
#include "fd.h"
-/** Grab clients that are not yet attached to a filter node. */
-struct list_head inactive_grab_client_list;
-
-static int max_num_filters(void)
-{
- int i, ret = 0;
+/**
+ * How to handle blocking writes for the grab client fds.
+ */
+enum grab_mode {
+ /** Ignore the data and do not write. */
+ GM_SLOPPY,
+ /** Write anyway (default). */
+ GM_AGGRESSIVE,
+ /** Close fd if write would block. */
+ GM_PEDANTIC,
+};
- for (i = 0; audio_formats[i]; i++) {
- PARA_INFO_LOG("%s filter chain length: %d\n", audio_formats[i],
- num_filters(i));
- ret = PARA_MAX(ret, num_filters(i));
- }
- PARA_INFO_LOG("maximal filter chain length: %d\n", ret);
- return ret;
-}
+/** Flags specified as arguments to the grab command. */
+enum grab_flags {
+ /** Stop grabbing if audio file changes. */
+ GF_ONE_SHOT = 1,
+};
-static struct filter_node *find_filter_node(int format, int filternum)
-{
- int i;
+/** Describes one active grab client. */
+struct grab_client {
+ /* The value of the -p option. */
+ char *parent;
+ /* The value of the -n option. */
+ char *name;
+ /** The file descriptor to send the grabbed stream to. */
+ int fd;
+ /** See \ref grab_mode. */
+ enum grab_mode mode;
+ /** Flags given at the command line. */
+ enum grab_flags flags;
+ /** The point of the grab client's node in the buffer tree. */
+ struct btr_node *btrn;
+ /* The task of this grab client. */
+ struct task task;
+ /** Belongs to either the active or the inactive list. */
+ struct list_head node;
+};
- FOR_EACH_SLOT(i) {
- struct slot_info *s = &slot[i];
- if (s->format < 0 || !s->fc)
- continue;
- if (format >= 0 && s->format != format)
- continue;
- if (num_filters(i) <= filternum)
- continue;
- /* success */
- return s->fc->filter_nodes + filternum;
- }
- return NULL;
-}
+/* Grab clients that are attached to a btr node. */
+INITIALIZED_LIST_HEAD(active_grab_client_list);
+/* Grab clients that are not currently attached any btr node. */
+INITIALIZED_LIST_HEAD(inactive_grab_client_list);
-static int gc_write(char *buf, size_t len, struct filter_callback *fcb)
+static int gc_write(struct grab_client *gc, char *buf, size_t len)
{
- struct grab_client *gc = container_of(fcb, struct grab_client, fcb);
- size_t written = 0;
+ int ret = write_ok(gc->fd);
- while (written < len) {
- int ret = write_ok(gc->fd);
- if (ret < 0)
+ if (ret < 0)
+ goto err;
+ if (ret == 0) { /* fd not ready */
+ if (gc->mode == GM_PEDANTIC)
goto err;
- if (ret == 0) { /* fd not ready */
- if (gc->mode == GM_PEDANTIC)
- goto err;
- if (gc->mode == GM_SLOPPY)
- return 1;
- }
- ret = write(gc->fd, buf + written, len - written);
- if (ret < 0) {
- if (errno != EAGAIN && errno != EINTR)
- goto err;
- if (gc->mode == GM_PEDANTIC)
- goto err;
- if (gc->mode == GM_SLOPPY)
- return 1;
- } else
- written += ret;
+ if (gc->mode == GM_SLOPPY)
+ return len;
}
- return 1;
+ ret = write_nonblock(gc->fd, buf, len, 0);
+ if (ret < 0)
+ goto err;
+ if (ret > 0)
+ return ret;
+ if (ret == 0) {
+ if (gc->mode == GM_PEDANTIC)
+ goto err;
+ if (gc->mode == GM_SLOPPY)
+ return len;
+ }
+ return 0;
err:
- gc->error = -E_GC_WRITE;
return -E_GC_WRITE;
}
-static void add_inactive_gc(struct grab_client *gc)
-{
- PARA_INFO_LOG("adding grab client %p (fd %d) to inactive list\n",
- gc, gc->fd);
- para_list_add(&gc->node, &inactive_grab_client_list);
-}
-
-static void gc_close(struct filter_callback *fcb)
+static void gc_pre_select(struct sched *s, struct task *t)
{
- struct grab_client *gc = container_of(fcb, struct grab_client, fcb);
+ struct grab_client *gc = container_of(t, struct grab_client, task);
+ int ret = btr_node_status(gc->btrn, 0, BTR_NT_LEAF);
- if ((gc->flags & GF_ONE_SHOT) || gc->error < 0) {
- PARA_INFO_LOG("closing fd %d (grab client %p)\n", gc->fd, gc);
- close(gc->fd);
- free(gc);
+ if (ret == 0)
+ return;
+ if (ret < 0) {
+ s->timeout.tv_sec = 0;
+ s->timeout.tv_usec = 0;
return;
}
- add_inactive_gc(gc);
+ para_fd_set(gc->fd, &s->wfds, &s->max_fileno);
}
+/*
+ * We need this forward declaration as post_select() needs
+ * activate_grab_client and vice versa.
+ */
+static void gc_post_select(struct sched *s, struct task *t);
+
/**
- * Move a grab client from the inactive list to a filter node.
+ * Move a grab client to the active list and start it.
*
* \param gc The grab client to activate.
- * \param fn The filter node \a gc gets attached to.
- *
- * \sa filter_node::callbacks, inactive_grab_client_list.
*/
-void activate_grab_client(struct grab_client *gc, struct filter_node *fn)
+static void gc_activate(struct grab_client *gc)
{
- PARA_INFO_LOG("activating %p (fd %d, filter node: %p)\n", gc, gc->fd, fn);
- list_del(&gc->node);
- para_list_add(&gc->fcb.node, &fn->callbacks);
+ struct btr_node *root = audiod_get_btr_root(), *parent;
+ char *name = gc->name? gc->name : "grab";
+
+ if (!root)
+ return;
+ parent = btr_search_node(gc->parent, root);
+ if (!parent)
+ return;
+ PARA_INFO_LOG("activating fd %d\n", gc->fd);
+ list_move(&gc->node, &active_grab_client_list);
+ gc->btrn = btr_new_node(&(struct btr_node_description)
+ EMBRACE(.name = name, .parent = parent));
+ if (!gc->task.pre_select) {
+ gc->task.pre_select = gc_pre_select;
+ gc->task.post_select = gc_post_select;
+ snprintf(gc->task.status, sizeof(gc->task.status) - 1, "%s", name);
+ gc->task.status[sizeof(gc->task.status) - 1] = '\0';
+ register_task(&gc->task);
+ }
}
/**
* Activate inactive grab clients if possible.
*
- * \param audio_format_num The number of the audio format of the new audio file.
- * \param fc The filter chain containing the activated filters.
- *
* This is called from audiod.c when the current audio file changes. It loops
* over all inactive grab clients and checks each grab client's configuration
* to determine if the client in question wishes to grab the new stream. If
- * yes, this grab client is moved from the inactive grab client list to an
- * appropriate filter_node.
+ * yes, this grab client is moved from the inactive to the active grab client list.
*
- * \sa filter_chain_info::filters, inactive_grab_client_list,
- * activate_grab_client.
+ * This function also garbage collects all grab clients whose tasks have been
+ * unscheduled.
*/
-void activate_inactive_grab_clients(int audio_format_num,
- struct filter_chain *fc)
+void activate_grab_clients(void)
{
struct grab_client *gc, *tmp;
- struct filter_node *fn;
list_for_each_entry_safe(gc, tmp, &inactive_grab_client_list, node) {
- if (gc->audio_format_num >= 0 && gc->audio_format_num !=
- audio_format_num)
- continue;
- if (gc->filter_num >= num_filters(audio_format_num))
+ if (gc->task.error == -E_TASK_UNREGISTERED) {
+ list_del(&gc->node);
+ free(gc);
continue;
- fn = fc->filter_nodes + gc->filter_num;
- activate_grab_client(gc, fn);
+ }
+ gc_activate(gc);
+ }
+}
+
+static int gc_close(struct grab_client *gc, int err)
+{
+ btr_remove_node(gc->btrn);
+ btr_free_node(gc->btrn);
+ gc->btrn = NULL;
+ PARA_INFO_LOG("closing gc: %s\n", para_strerror(-err));
+ list_move(&gc->node, &inactive_grab_client_list);
+ if (err == -E_GC_WRITE || (gc->flags & GF_ONE_SHOT)) {
+ /*
+ * We must not free the gc structure here as it contains ->task
+ * which is still used because this function is called from
+ * post_select().
+ */
+ close(gc->fd);
+ free(gc->parent);
+ free(gc->name);
+ return 1;
}
+ gc_activate(gc);
+ return 0;
+}
+
+static void gc_post_select(__a_unused struct sched *s, struct task *t)
+{
+ struct grab_client *gc = container_of(t, struct grab_client, task);
+ struct btr_node *btrn = gc->btrn;
+ int ret;
+ size_t sz;
+ char *buf;
+
+ t->error = 0;
+ ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
+ if (ret == 0)
+ return;
+ if (ret < 0)
+ goto err;
+ sz = btr_next_buffer(btrn, &buf);
+ assert(sz != 0);
+ ret = gc_write(gc, buf, sz);
+ if (ret < 0)
+ goto err;
+ if (ret > 0)
+ btr_consume(btrn, ret);
+ return;
+err:
+ t->error = gc_close(gc, ret)? ret : 0;
}
-static int check_gc_args(int argc, char **argv, struct grab_client *gc)
+static int gc_check_args(int argc, char **argv, struct grab_client *gc)
{
- int i, ret;
+ int i;
- gc->audio_format_num = -1; /* default: grab any audio format */
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (arg[0] != '-')
i++;
break;
}
- if (!strncmp(arg, "-n=", 3)) {
- ret = para_atoi32(arg + 3, &gc->filter_num);
- if (ret < 0)
- return ret;
- if (gc->filter_num < 0)
- return -E_BAD_GC_FILTER_NUM;
- if (gc->filter_num >= max_num_filters())
- return -E_BAD_GC_FILTER_NUM;
- continue;
- }
if (!strncmp(arg, "-m", 2)) {
if (*(arg + 3))
return -E_GC_SYNTAX;
return -E_GC_SYNTAX;
}
}
- if (!strcmp(arg, "-i")) {
- gc->flags |= GF_INPUT_GRAB;
- continue;
- }
if (!strcmp(arg, "-o")) {
gc->flags |= GF_ONE_SHOT;
continue;
}
- if (!strncmp(arg, "-f=", 3)) {
- ret = get_audio_format_num(arg + 3);
- if (ret < 0)
- return ret;
- gc->audio_format_num = ret;
+ if (!strncmp(arg, "-p=", 3)) {
+ gc->parent = para_strdup(arg + 3);
+ continue;
+ }
+ if (!strncmp(arg, "-n=", 3)) {
+ gc->name = para_strdup(arg + 3);
continue;
}
return -E_GC_SYNTAX;
*
* If the command line options given by \a argc and \a argv are valid.
* allocate a struct grab_client and initialize it with this valid
- * configuration. Moreover, add the new grab client to the inactive list.
+ * configuration.
*
- * \return Standard.
+ * If the new grab client can be added to an existing buffer tree, activate it.
+ * Otherwise, add it to the inactive list for later activation.
*
- * \sa grab_client, inactive_grab_client_list, activate_grab_client,
- * filter_node::callbacks.
+ * \return Standard.
*/
int grab_client_new(int fd, int argc, char **argv)
{
int ret;
struct grab_client *gc = para_calloc(sizeof(struct grab_client));
- struct filter_node *fn;
- ret = check_gc_args(argc, argv, gc);
+ ret = gc_check_args(argc, argv, gc);
if (ret < 0)
goto err_out;
- if (gc->flags & GF_INPUT_GRAB)
- gc->fcb.input_cb = gc_write;
- else
- gc->fcb.output_cb = gc_write;
gc->fd = fd;
- gc->fcb.close = gc_close;
- fn = find_filter_node(gc->audio_format_num, gc->filter_num);
- if (fn)
- para_list_add(&gc->fcb.node, &fn->callbacks);
- else
- add_inactive_gc(gc);
+ para_list_add(&gc->node, &inactive_grab_client_list);
+ gc_activate(gc);
return 1;
err_out:
free(gc);
return ret;
}
-
-/**
- * Initialize the grabbing subsystem.
- *
- * This has to be called once during startup before any other function from
- * grab_client.c may be used. It initializes \a inactive_grab_client_list.
- */
-void init_grabbing(void)
-{
- PARA_INFO_LOG("grab init\n");
- INIT_LIST_HEAD(&inactive_grab_client_list);
-}
projects / paraslash.git / blobdiff