X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=filter.h;h=bf99a677b7c0b6e5cab95111834ad031c19c7619;hp=15bfaf8cdb0c2533c463fe8272d21e5528b80dbd;hb=fdd1f83d38148ecb76aac90ec02b12a985de8821;hpb=43e0a7f669d782e73513119b7140dc4e56bcc3d7

diff --git a/filter.h b/filter.h
index 15bfaf8c..bf99a677 100644
--- a/filter.h
+++ b/filter.h
@@ -32,6 +32,9 @@ struct filter_node {
 	struct list_head callbacks;
 	/** A pointer to the configuration of this instance. */
 	void *conf;
+	struct btr_node *btrn;
+	struct task task;
+	size_t min_iqs;
 };
 
 /** Describes one running instance of a chain of filters */
@@ -81,49 +84,6 @@ struct filter_chain {
 #define FOR_EACH_FILTER_NODE(fn, fc, i) for (i = 0; i < (fc)->num_filters \
 	&& (fn = (fc)->filter_nodes + i); i++)
 
-
-/**
- * Used to manage grab clients.
- *
- * An application using paraslash's filter subsystem may register any number of
- * callbacks for each filter_node. It is possible to attach a filter callback
- * while the filter is running. This is used for stream grabbing in
- * para_audiod: Whenever a client sends the 'grab' command, para_audiod adds a
- * filter callback to the list of callbacks for the filter node specified in
- * the grab command.
- */
-struct filter_callback {
-	/** All callbacks are organized in a doubly linked list. */
-	struct list_head node;
-	/**
-	 * The input callback.
-	 *
-	 * If not \p NULL, the filter subsystem calls this function whenever the filter
-	 * consumed some or all of its input buffer. A pointer to the buffer of consumed
-	 * data, its length and a pointer to the own \a filter_callback structure are passed
-	 * to \a input_cb. The input callback is expected to return a negative value on errors.
-	 */
-	int (*input_cb)(char *buf, size_t len, struct filter_callback *fc);
-	/**
-	 * The output callback.
-	 *
-	 * If not NULL, this is called whenever the filter produces output. A pointer
-	 * to the output data, its length and a pointer to the own \a filter_callback
-	 * structure are passed to \a output_cb. Like the input callback, the output
-	 * callback is expected to return a negative value on errors.
-	 */
-	int (*output_cb)(char *buf, size_t len, struct filter_callback *fc);
-	/**
-	 * The callback close function.
-	 *
-	 * This gets called whenever the input/output callback returned an error, or if
-	 * the filter chain is going to be destroyed, e.g. because the end of the
-	 * stream was encountered. It is assumed to succeed.
-	 */
-	void (*close)(struct filter_callback *fc);
-};
-
-
 /**
  * The structure associated with a paraslash filter.
  *
@@ -155,19 +115,6 @@ struct filter {
 	 * of \a fn suitably. The open function is assumed to succeed.
 	 */
 	void (*open)(struct filter_node *fn);
-	/**
-	 * Convert (filter) the given data.
-	 *
-	 * Pointer to the converting function of the filter. It should convert the
-	 * given input buffer \a inbuf which is of length \a len to the previously
-	 * reserved output buffer of \a fn. On success, it must return the number of
-	 * bytes it consumed from \a inbuf. On errors, a negative number indicating the
-	 * kind of the error must be returned.
-	 *
-	 * A zero return value just means that nothing was converted (probably because
-	 * the input buffer was too small). This is not interpreted as an error.
-	 */
-	ssize_t (*convert)(char *inbuf, size_t len, struct filter_node *fn);
 	/**
 	 * Close one instance of this filter.
 	 *
@@ -188,16 +135,26 @@ struct filter {
 	 * argv. On failure, a negative paraslash error code must be returned.
 	 */
 	int (*parse_config)(int argc, char **argv, void **config);
+	void (*free_config)(void *conf);
 
 	/** The help texts for this filter. */
 	struct ggo_help help;
+	void (*pre_select)(struct sched *s, struct task *t);
+	/**
+	 * Convert (filter) the given data.
+	 *
+	 * Pointer to the converting function of the filter. It should convert as
+	 * input data as possible. On errors, the post_select function is supposed
+	 * to set t->error to a (negative) error code.
+	 */
+	void (*post_select)(struct sched *s, struct task *t);
+	btr_command_handler execute;
 };
 
-void close_filters(struct filter_chain *fc);
 void filter_init(void);
 int check_filter_arg(char *filter_arg, void **conf);
-void filter_post_select(__a_unused struct sched *s, struct task *t);
 void print_filter_helps(int detailed);
+void generic_filter_pre_select(struct sched *s, struct task *t);
 
 static inline void write_int16_host_endian(char *buf, int val)
 {