-/*
- * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file filter.h Filter-related structures and exported symbols from filter_common.c. */
-/** The list of supported filters. */
-enum filter_enum {FILTER_ENUM};
-
/**
* Describes one running instance of a filter.
*/
struct list_head callbacks;
/** A pointer to the configuration of this instance. */
void *conf;
+ /** The parsed command line, merged with options given in the config file. */
+ struct lls_parse_result *lpr;
/** The buffer tree node. */
struct btr_node *btrn;
/** The task corresponding to this filter node. */
};
/**
- * The structure associated with a paraslash filter.
+ * Describes a method to convert audio data.
+ *
+ * Paraslash filters are "modules" which transform the data of an audio stream.
+ * This structure contains the methods which have to be implemented by each
+ * filter.
*
- * Paraslash filters are "modules" which are used to transform an audio stream.
- * struct filter contains pointers to functions that must be supplied by the
- * filter code in order to be used by the driving application (currently
- * para_audiod and para_filter).
+ * As several instances of the same filter may be running at the same time, all
+ * filter methods must be reentrant and no static non-constant variables must
+ * be used.
*
- * Note: As several instances of the same filter may be running at the same
- * time, all these filter functions must be reentrant; no static non-constant
- * variables may be used.
- * \sa mp3dec_filter.c, oggdec_filter.c, wav_filter.c, compress_filter.c, filter_node
+ * \sa \ref filter_node, struct \ref receiver, struct \ref writer, struct \ref
+ * sched.
*/
struct filter {
- /** The name of the filter. */
- const char *name;
- /**
- * Pointer to the filter init routine.
- *
- * This function is only called once at startup. It must initialize the
- * other non-optional function pointers of this structure.
- */
- void (*init)(struct filter *f);
/**
* Open one instance of this filter.
*
- * This should allocate the output buffer of the given filter node and do any
- * other filter-specific preparations like initializing the private_data member
- * of \a fn suitably. The open function is assumed to succeed.
+ * This should allocate the output buffer of the given filter node and
+ * do any other filter-specific preparations like initializing the
+ * private_data member of \a fn suitably. The open function is
+ * optional, If it is provided, it is assumed to succeed.
*/
void (*open)(struct filter_node *fn);
/**
* Close one instance of this filter.
*
- * Free all resources of associated with \a fn that were previously allocated
- * by the open() function. It's OK to leave this alone if the filter does not
- * need any cleanups.
+ * Free all resources associated with \a fn that were previously
+ * allocated by the open() function. It's OK to set this to NULL if the
+ * filter does not need to perform any cleanup operation.
*/
void (*close)(struct filter_node *fn);
/**
- * A pointer to the filter's command line parser.
+ * Prepare the filter according to command line options.
*
- * If this optional function pointer is not NULL, any filter options
- * are passed from the main program to this command line parser once at
- * application startup. The command line parser should check its
- * command line options given by \a argc and \a argv and abort on
- * errors. Success must be indicated by a non-negative return value. In
- * this case the function should return a pointer to the
- * filter-specific configuration data determined by \a argc and \a
- * argv. On failure, a negative paraslash error code must be returned.
- */
- int (*parse_config)(int argc, char **argv, void **config);
- /**
- * Deallocate the memory for the configuration.
+ * In addition to the syntactic checks which are automatically performed
+ * by the lopsub functions, some filters like to also check the command
+ * line arguments semantically. Moreover, since applications may open
+ * the filter many times with the same options, filters need a method
+ * which allows them to precompute once those parts of the setup which
+ * depend only on the command line options.
*
- * This is called to free whatever ->parse_config() has allocated.
- */
- void (*free_config)(void *conf);
-
- /** The help texts for this filter. */
- struct ggo_help help;
- /**
- * Set scheduler timeout and add file descriptors to fd sets.
+ * If this function pointer is not NULL, the function is called once at
+ * startup. The returned pointer value is made available to the ->open
+ * method via the ->conf pointer of struct filter_node.
*
- * This function controls the timeout value for the next call to
- * select(2). It may decrease the current timeout but shall never
- * increase it. The second purpose of this function is to add file
- * descriptors to the two fd sets of the sched structure. The
- * descriptors in these sets will be watched by the subsequent
- * select(2) call.
+ * Filters are supposed to abort if the setup fails. If the function
+ * returns, it is assumed to have succeeded.
*/
- void (*pre_select)(struct sched *s, void *context);
+ void *(*setup)(const struct lls_parse_result *lpr);
/**
- * Convert (filter) the given data.
+ * Deallocate precomputed resources.
*
- * Pointer to the converting function of the filter. On errors, the
- * post_select function is supposed to return a negative error code.
+ * This should free whatever ->setup() has allocated.
*/
- int (*post_select)(struct sched *s, void *context);
+ void (*teardown)(const struct lls_parse_result *lpr, void *conf);
+ /** Force a zero timeout if data is available in the buffer tree. */
+ void (*pre_monitor)(struct sched *s, void *context);
+ /** Convert (filter) input data into output data. */
+ int (*post_monitor)(struct sched *s, void *context);
/**
* Answer a buffer tree query.
*
btr_command_handler execute;
};
-void filter_init(void);
-int check_filter_arg(char *filter_arg, void **conf);
-void print_filter_helps(unsigned flags);
-void generic_filter_pre_select(struct sched *s, void *context);
+void print_filter_helps(bool detailed);
+void print_filter_list(void);
+int filter_setup(const char *fa, void **conf, struct lls_parse_result **lprp);
+#define FILTER_CMD(_num) (lls_cmd(_num, filter_cmd_suite))
+#define FILTER_CMD_OPT(_cmd, _opt) (lls_opt( \
+ LSG_FILTER_CMD_ ## _cmd ## _OPT_ ## _opt, \
+ FILTER_CMD(LSG_FILTER_CMD_CMD_ ## _cmd)))
+#define FILTER_CMD_OPT_RESULT(_cmd, _opt, _lpr) \
+ (lls_opt_result(LSG_FILTER_CMD_ ## _cmd ## _OPT_ ## _opt, _lpr))
+#define FILTER_CMD_OPT_GIVEN(_cmd, _opt, _lpr) \
+ (lls_opt_given(FILTER_CMD_OPT_RESULT(_cmd, _opt, _lpr)))
+#define FILTER_CMD_OPT_UINT32_VAL(_cmd, _opt, _lpr) \
+ (lls_uint32_val(0, FILTER_CMD_OPT_RESULT(_cmd, _opt, _lpr)))
+#define FILTER_CMD_OPT_STRING_VAL(_cmd, _opt, _lpr) \
+ (lls_string_val(0, FILTER_CMD_OPT_RESULT(_cmd, _opt, _lpr)))
+
+void generic_filter_pre_monitor(struct sched *s, void *context);
int decoder_execute(const char *cmd, unsigned sample_rate, unsigned channels,
char **result);
#endif
}
-DECLARE_FILTER_INITS
-
-/** The filter array, one structure for each supported filter. */
const struct filter *filter_get(int filter_num);
+const char *filter_name(int filter_num);