audioc: Switch to blocking file descriptors.

[paraslash.git] / filter.h

diff --git a/filter.h b/filter.h
index 6529028e1a05a1c8b1b989cab8a2ccca00940e0d..befcd3381abd539ec743bf3e28b5198d7b093b50 100644 (file)
--- a/filter.h
+++ b/filter.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -15,19 +15,11 @@ enum filter_enum {FILTER_ENUM};
 struct filter_node {
        /** The number in the array of available filters. */
        unsigned filter_num;
-       /** The filter chain this filter node belongs to. */
-       struct filter_chain *fc;
        /**
         * Each filter may store any filter-specific information about the particular
         * instance of the filter here.
         */
        void *private_data;
-       /** The output buffer. */
-       char *buf;
-       /** The size of the output buffer. */
-       size_t bufsize;
-       /** The number of bytes currently loaded in \a buf. */
-       size_t loaded;
        /** The list of registered callbacks. */
        struct list_head callbacks;
        /** A pointer to the configuration of this instance. */
@@ -37,96 +29,6 @@ struct filter_node {
        size_t min_iqs;
 };
 
-/** Describes one running instance of a chain of filters */
-struct filter_chain {
-       /** The length of the filter chain. */
-       unsigned int num_filters;
-       /**
-        * The number of channels of the current stream.
-        *
-        * Set by the decoding filter.
-        */
-       unsigned int channels;
-       /**
-        * Current sample rate in Hz.
-        *
-        * Set by the decoding filter.
-        */
-       unsigned int samplerate;
-       /** The list containing all filter nodes in this filter chain. */
-       struct filter_node *filter_nodes;
-       /**
-        * The input buffer of the filter chain.
-        *
-        * This is set to point to the output buffer of the receiving application (the
-        * buffer used to read from stdin for para_filter; the output buffer of the
-        * current receiver for para_audiod).
-        */
-       char **inbufp;
-       /**
-        * The output buffer of the filter chain.
-        *
-        * Points to the output buffer of the last filter in the filter chain.
-        */
-       char **outbufp;
-       /** Contains the number of bytes loaded in the input buffer. */
-       size_t *in_loaded;
-       /** Contains the number of bytes loaded in the output buffer. */
-       size_t *out_loaded;
-       /** Pointer to the error variable of the receiving application. */
-       int *input_error;
-       /** Pointer to the error variable of the writing application. */
-       int *output_error;
-       /** The task associated with the filter chain. */
-       struct task task;
-};
-
-#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.
  *
@@ -162,7 +64,8 @@ struct filter {
         * Close one instance of this filter.
         *
         * Free all resources of associated with \a fn that were previously allocated
-        * by the open() function.
+        * by the open() function. It's OK to leave this alone if the filter does not
+        * need any cleanups.
         */
        void (*close)(struct filter_node *fn);
        /**