-/*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file filter_common.c Common helper functions for filter input/output. */
#include <regex.h>
#include <sys/types.h>
-#include <dirent.h>
+#include <lopsub.h>
+#include "filter_cmd.lsg.h"
#include "para.h"
#include "list.h"
#include "sched.h"
#include "fd.h"
-#include "ggo.h"
+#include "buffer_tree.h"
#include "filter.h"
#include "error.h"
#include "string.h"
-/** The array of supported filters. */
-struct filter filters[NUM_SUPPORTED_FILTERS] = {FILTER_ARRAY};
+/** Iterate over all filters. */
+#define FOR_EACH_FILTER(j) for (j = 1; FILTER_CMD(j); j++)
/**
- * Call the init function of each supported filter.
- * \sa filter::init
+ * Obtain a reference to a filter structure.
+ *
+ * \param filter_num Between zero and NUM_SUPPORTED_FILTERS, inclusively.
+ *
+ * \return Pointer to the filter identified by the given filter number, or
+ * NULL if the filter number is out of range.
+ *
+ * \sa filter_name().
*/
-void filter_init(void)
+const struct filter *filter_get(int filter_num)
{
- int i;
+ if (filter_num < 1 || filter_num > LSG_NUM_FILTER_CMD_SUBCOMMANDS)
+ return NULL;
+ return lls_user_data(FILTER_CMD(filter_num));
+}
- FOR_EACH_SUPPORTED_FILTER(i)
- filters[i].init(filters + i);
+static inline bool filter_supported(int filter_num)
+{
+ return lls_user_data(FILTER_CMD(filter_num));
}
/**
- * Close and destroy a filter callback.
+ * Return the name of a filter, given its number.
*
- * \param fcb The filter callback to close.
+ * \param filter_num See \ref filter_get().
*
- * This removes \a fcb from the list of filter callbacks and calls
- * the close callback associated with \a fcb.
+ * \return A pointer to a string literal, or NULL if filter_num is out of
+ * range. The caller must not attempt to call free(3) on the returned pointer.
*/
-static void close_filter_callback(struct filter_callback *fcb)
+const char *filter_name(int filter_num)
{
- PARA_NOTICE_LOG("closing filter_callback %p\n", fcb);
- list_del(&fcb->node);
- fcb->close(fcb);
+ if (filter_num < 1 || filter_num > LSG_NUM_FILTER_CMD_SUBCOMMANDS)
+ return NULL;
+ return lls_command_name(FILTER_CMD(filter_num));
}
/**
- * Close all callbacks of a filter node.
+ * Parse a filter command line and call the corresponding ->setup method.
+ *
+ * \param fa The filter argument.
+ * \param conf Points to filter-specific setup upon successful return.
+ * \param lprp Parsed command line options are returned here.
*
- * \param fn The filter node which contains the filter callbacks to be closed.
+ * Check if the given filter argument starts with the name of a supported
+ * filter, optionally followed by options for this filter. If yes, call the
+ * command line parser of that filter and its ->setup method.
*
- * Call close_filter_callback() for each entry in the filter callback list
- * of \a fn.
+ * \return This function either succeeds or does not return. On success, the
+ * number of the filter is returned and conf is initialized to point to the
+ * filter configuration as returned by the filter's ->setup() method, if any.
+ * Moreover, *lprp is initialized to contain the parsed command line options.
+ * On errors, the function calls exit(EXIT_FAILURE).
*/
-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);
- }
-}
-
-static void call_callbacks(struct filter_node *fn, char *inbuf, size_t inlen,
- char *outbuf, size_t outlen)
+int filter_setup(const char *fa, void **conf, struct lls_parse_result **lprp)
{
- struct filter_callback *fcb, *tmp;
- list_for_each_entry_safe(fcb, tmp, &fn->callbacks, node) {
- int ret;
- if (inlen && fcb->input_cb) {
- ret = fcb->input_cb(inbuf, inlen, fcb);
- if (ret < 0) {
- close_filter_callback(fcb);
- continue;
- }
- }
- if (!outlen || !fcb->output_cb)
- continue;
- ret = fcb->output_cb(outbuf, outlen, fcb);
- if (ret < 0)
- close_filter_callback(fcb);
+ int ret, filter_num, argc;
+ char *errctx = NULL, **argv;
+ const struct lls_command *cmd;
+ const struct filter *f;
+
+ ret = create_argv(fa, " \t\n", &argv);
+ if (ret < 0)
+ goto fail;
+ argc = ret;
+ ret = lls(lls_lookup_subcmd(argv[0], filter_cmd_suite, &errctx));
+ if (ret < 0)
+ goto free_argv;
+ filter_num = ret;
+ cmd = FILTER_CMD(filter_num);
+ if (!filter_supported(filter_num)) {
+ ret = -E_UNSUPPORTED_FILTER;
+ errctx = make_message("bad filter name: %s",
+ lls_command_name(cmd));
+ goto free_argv;
}
+ ret = lls(lls_parse(argc, argv, cmd, lprp, &errctx));
+ if (ret < 0)
+ goto free_argv;
+ f = filter_get(filter_num);
+ *conf = f->setup? f->setup(*lprp) : NULL;
+ ret = filter_num;
+free_argv:
+ free_argv(argv);
+ if (ret >= 0)
+ return ret;
+fail:
+ if (errctx)
+ PARA_ERROR_LOG("%s\n", errctx);
+ free(errctx);
+ PARA_EMERG_LOG("%s\n", para_strerror(-ret));
+ exit(EXIT_FAILURE);
}
/**
- * Call the convert function of each filter.
- *
- * \param s Unused.
- * \param t The task identifying the filter chain.
- *
- * This is the core function of the filter subsystem. It loops over the list of
- * filter nodes determined by \a t and calls the filter's convert function if
- * there is input available for the filter node in question. If the convert
- * function consumed some or all of its input data, all registered input
- * callbacks are called. Similarly, if a convert function produced output, all
- * registered output callbacks get called.
- *
- * On errors a (negative) error code is stored in t->error.
+ * Print help text of each filter to stdout.
*
- * \sa filter_node, filter#convert, filter_callback.
+ * \param detailed Whether to print short or long help.
*/
-void filter_post_select(__a_unused struct sched *s, struct task *t)
+void print_filter_helps(bool detailed)
{
- struct filter_chain *fc = container_of(t, struct filter_chain, task);
- struct filter_node *fn;
- char *ib;
- size_t *loaded;
- int i, conv, conv_total = 0;
+ int i, num = 0;
- if (fc->output_error && *fc->output_error < 0) {
- t->error = *fc->output_error;
- return;
- }
-again:
- ib = *fc->inbufp;
- loaded = fc->in_loaded;
- conv = 0;
- FOR_EACH_FILTER_NODE(fn, fc, i) {
- struct filter *f = filters + fn->filter_num;
- if (fn->loaded < fn->bufsize) {
- size_t size, old_fn_loaded = fn->loaded;
- t->error = f->convert(ib, *loaded, fn);
- if (t->error < 0)
- return;
- size = t->error;
- call_callbacks(fn, ib, size, fn->buf + old_fn_loaded,
- fn->loaded - old_fn_loaded);
- *loaded -= size;
- conv += size + fn->loaded - old_fn_loaded;
- if (*loaded && size)
- memmove(ib, ib + size, *loaded);
+ printf("\nAvailable filters: ");
+ FOR_EACH_FILTER(i) {
+ if (!filter_supported(i))
+ continue;
+ if (num > 50) {
+ printf("\n ");
+ num = 0;
}
- ib = fn->buf;
- loaded = &fn->loaded;
+ num += printf("%s%s", i? " " : "", filter_name(i));
+ }
+ printf("\n");
+
+ FOR_EACH_FILTER(i) {
+ const struct lls_command *cmd = FILTER_CMD(i);
+ char *help;
+
+ if (!filter_supported(i))
+ continue;
+ help = detailed? lls_long_help(cmd) : lls_short_help(cmd);
+ if (!help)
+ continue;
+ printf("%s\n", help);
+ free(help);
}
- conv_total += conv;
- if (conv)
- goto again;
- if (*fc->input_error >= 0)
- return;
- if (*fc->out_loaded)
- return;
- if (*fc->in_loaded && conv_total)
- return;
- t->error = -E_FC_EOF;
}
/**
- * Close all filter nodes and their callbacks.
- *
- * \param fc The filter chain to close.
+ * Print a short summary of all available filters to stdout.
*
- * 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
+ * For each supported filter, the filter name and the purpose text is printed
+ * in a single line. Since no options are shown, the filter list is more
+ * concise than the text obtained from print_filter_helps().
*/
-void close_filters(struct filter_chain *fc)
+void print_filter_list(void)
{
- 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);
+ printf("Available filters:\n");
+ FOR_EACH_FILTER(i) {
+ const struct lls_command *cmd = FILTER_CMD(i);
+ if (!filter_supported(i))
+ continue;
+ printf("%-9s %s\n", filter_name(i), lls_purpose(cmd));
}
- 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
+/**
+ * Set select timeout of the scheduler.
+ *
+ * \param s The scheduler.
+ * \param context Pointer to the filter node (task context).
+ *
+ * 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 occurred, a minimal timeout
+ * for the next select call is requested from the scheduler. Otherwise the
+ * scheduler timeout is left unchanged.
*/
-static int parse_filter_args(int filter_num, char *options, void **conf)
+void generic_filter_pre_select(struct sched *s, void *context)
{
- struct filter *f = &filters[filter_num];
- int ret, i, argc = 2;
- char **argv;
+ struct filter_node *fn = context;
-// PARA_DEBUG_LOG("%s, options: %s, parser: %p\n", f->name,
-// options? options : "(none)", f->parse_config);
- if (!f->parse_config)
- return strlen(options)? -E_BAD_FILTER_OPTIONS : filter_num;
-// PARA_DEBUG_LOG("options: %s\n", options);
- argc = create_argv(options, " \t", &argv);
- if (argc < 0)
- return -E_BAD_FILTER_OPTIONS;
- PARA_DEBUG_LOG("argc = %d, argv[0]: %s\n", argc, argv[0]);
- for (i = argc - 1; i >= 0; i--)
- argv[i + 1] = argv[i];
- argv[0] = para_strdup(f->name);
- argc++;
- ret = f->parse_config(argc, argv, conf);
- free(argv[argc - 1]);
- argv[argc - 1] = NULL;
- free_argv(argv);
- return ret < 0? ret : filter_num;
+ 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
+
/**
- * Check the filter command line options.
- *
- * \param fa The command line options.
- * \param conf Points to the filter configuration upon successful return.
+ * Execute a btr command for a decoder.
*
- * Check if \a fa starts with a the name of a supported filter, followed by
- * a colon. If yes, call the command line parser of that filter.
+ * 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.
*
- * \return On success, the number of the filter is returned and \a conf
- * is initialized to point to the filter configuration determined by \a fa.
- * On errors, a negative value is returned.
+ * \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.
*
- * Note: If \a fa specifies a filter that has no command line parser success is
- * returned, and \a conf is initialized to \p NULL.
- *
- * \sa filter::parse_config
+ * \return Standard.
*/
-int check_filter_arg(char *fa, void **conf)
+int decoder_execute(const char *cmd, unsigned sample_rate, unsigned channels,
+ char **result)
{
- int j;
-
- *conf = NULL;
-// PARA_DEBUG_LOG("arg: %s\n", fa);
- FOR_EACH_SUPPORTED_FILTER(j) {
- const char *name = filters[j].name;
- size_t len = strlen(name);
- char c;
- if (strlen(fa) < len)
- continue;
- if (strncmp(name, fa, len))
- continue;
- c = fa[len];
- if (c && c != ' ')
- continue;
- if (c && !filters[j].parse_config)
- return -E_BAD_FILTER_OPTIONS;
- return parse_filter_args(j, c? fa + len + 1 :
- fa + strlen(fa), conf);
+ if (!strcmp(cmd, "sample_rate")) {
+ if (sample_rate == 0)
+ return -E_BTR_NAVAIL;
+ *result = make_message("%u", sample_rate);
+ return 1;
}
- return -E_UNSUPPORTED_FILTER;
-}
-
-void print_filter_helps(int detailed)
-{
- int i;
-
- printf_or_die("\nAvailable filters: \n\t");
- FOR_EACH_SUPPORTED_FILTER(i)
- printf_or_die("%s%s", i? " " : "", filters[i].name);
- printf_or_die("\n\n");
-
- FOR_EACH_SUPPORTED_FILTER(i) {
- struct filter *f = filters + i;
-
- if (!f->help.short_help)
- continue;
- printf_or_die("Options for %s:\n", f->name);
- ggo_print_help(&f->help, detailed);
+ 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("%d", DECODER_SAMPLE_FORMAT);
+ return 1;
+ }
+ return -ERRNO_TO_PARA_ERROR(ENOTSUP);
}
projects / paraslash.git / blobdiff