/*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
#include <regex.h>
#include <sys/types.h>
-#include <dirent.h>
#include <stdbool.h>
#include "para.h"
filters[i].init(filters + i);
}
-/**
- * Close and destroy a filter callback.
- *
- * \param fcb The filter callback to close.
- *
- * This removes \a fcb from the list of filter callbacks and calls
- * the close callback associated with \a fcb.
- */
-static void close_filter_callback(struct filter_callback *fcb)
-{
- PARA_NOTICE_LOG("closing filter_callback %p\n", fcb);
- list_del(&fcb->node);
- fcb->close(fcb);
-}
-
-/**
- * Close all callbacks of a filter node.
- *
- * \param fn The filter node which contains the filter callbacks to be closed.
- *
- * Call close_filter_callback() for each entry in the filter callback list
- * of \a fn.
- */
-static void close_callbacks(struct filter_node *fn)
-{
- struct filter_callback *fcb, *tmp;
-
- list_for_each_entry_safe(fcb, tmp, &fn->callbacks, node) {
- PARA_INFO_LOG("closing %s filter callback\n",
- filters[fn->filter_num].name);
- close_filter_callback(fcb);
- }
-}
-
-/**
- * Close all filter nodes and their callbacks.
- *
- * \param fc The filter chain to close.
- *
- * For each filter node determined by \a fc, call the close function of each
- * registered filter callback as well as the close function of the
- * corresponding filter. Free all resources and destroy all callback lists and
- * the filter node list.
- *
- * \sa filter::close, filter_callback::close
- */
-void close_filters(struct filter_chain *fc)
-{
- struct filter_node *fn;
- int i;
-
- if (!fc)
- return;
- PARA_NOTICE_LOG("closing filter chain %p\n", fc);
- FOR_EACH_FILTER_NODE(fn, fc, i) {
- struct filter *f = filters + fn->filter_num;
- close_callbacks(fn);
- PARA_INFO_LOG("closing %s filter\n", f->name);
- f->close(fn);
- free(fn->conf);
- }
- free(fc->filter_nodes);
-}
-
/*
* If the filter has a command line parser and options is not NULL, run it.
* Returns filter_num on success, negative on errors
return -E_UNSUPPORTED_FILTER;
}
+/**
+ * Print help text of each filter to stdout.
+ *
+ * \param detailed If non-zero, print detailed help.
+ */
void print_filter_helps(int detailed)
{
int i;
printf_or_die("Options for %s:\n", f->name);
ggo_print_help(&f->help, detailed);
}
-
}
+/**
+ * Set select timeout of the the scheduler.
+ *
+ * \param s The scheduler.
+ * \param t The task struct of this filter.
+ *
+ * This looks at the status of the btr node of the filter. If data is available
+ * in the input queue of the filter, or if an error occured, a minimal timeout
+ * for the next select call is requested from the scheduler. Otherwise the
+ * scheduler timeout is left unchanged.
+ */
void generic_filter_pre_select(struct sched *s, struct task *t)
{
struct filter_node *fn = container_of(t, struct filter_node, task);
t->error = 0;
- if (btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL) != 0) {
- s->timeout.tv_sec = 0;
- s->timeout.tv_usec = 1;
- }
+ if (btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL) != 0)
+ sched_min_delay(s);
}
+#ifdef WORDS_BIGENDIAN
+#define DECODER_SAMPLE_FORMAT SF_S16_BE
+#else
+#define DECODER_SAMPLE_FORMAT SF_S16_LE
+#endif
+
+/**
+ * Execute a btr command for a decoder.
+ *
+ * The buffer tree nodes of the writers ask the parent nodes about sample_rate,
+ * channels count and sample format. This function is called by all decoders to
+ * answer these queries.
+ *
+ * \param cmd The command to be executed by the child node.
+ * \param sample_rate Known to the decoder.
+ * \param channels Known to the decoder.
+ * \param result Ascii representation on the answer is stored here.
+ *
+ * \return Standard.
+ */
+int decoder_execute(const char *cmd, unsigned sample_rate, unsigned channels,
+ char **result)
+{
+ if (!strcmp(cmd, "sample_rate")) {
+ if (sample_rate == 0)
+ return -E_BTR_NAVAIL;
+ *result = make_message("%u", sample_rate);
+ return 1;
+ }
+ if (!strcmp(cmd, "channels")) {
+ if (channels == 0)
+ return -E_BTR_NAVAIL;
+ *result = make_message("%u", channels);
+ return 1;
+ }
+ if (!strcmp(cmd, "sample_format")) {
+ *result = make_message("%u", DECODER_SAMPLE_FORMAT);
+ return 1;
+ }
+ return -ERRNO_TO_PARA_ERROR(ENOTSUP);
+}