/*
- * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
*/
-/** \file write.h writer-related structures */
+/** \file write.h Writer-related structures. */
-/** the list of supported writers */
+/** The list of supported writers. */
enum writer_enum {WRITER_ENUM};
/**
- * decbribes one running instance of a writer
+ * Describes one running instance of a writer.
*/
struct writer_node {
- /** points to the writer structure associated with this node */
- struct writer *writer; /* FIXME: Should better be only the number */
- /** writer-specific data */
+ /** The number of this writer. */
+ int writer_num;
+ /** Writer-specific data. */
void *private_data;
- /** send that many bytes in one go */
- int chunk_bytes;
- /** pointer to the group this node belongs to */
- struct writer_node_group *wng;
- /** the writer-specific configuration of this node */
+ /** The writer-specific configuration of this node. */
void *conf;
- /** how much of the wng's buffer is already written */
- size_t written;
+ struct btr_node *btrn;
+ struct task task;
+ size_t min_iqs;
};
-/** describes one supported writer */
+/** Describes one supported writer. */
struct writer {
/**
- * the init function of the writer
+ * The init function of the writer.
*
* It must fill in all other function pointers of the given
* writer structure.
- *
*/
void (*init)(struct writer *w);
/**
+ * The command line parser of the writer.
*
- *
- * the command line parser of the writer
- *
- * It should check whether the command line options given by \a options are
- * valid. On success, it should return a pointer to the writer-specific
- * configuration data determined by \a options. Note that this might be called
- * more than once with different values of \a options.
- *
+ * It should check whether the command line options given by \a options
+ * are valid and return a pointer to the writer-specific configuration
+ * data determined by \a options. This function must either succeed or
+ * call exit(). Note that parse_config_or_die() might be called more
+ * than once with different values of \a options. \sa \ref
+ * free_config().
*/
- void * (*parse_config)(const char *options);
+ void *(*parse_config_or_die)(const char *options);
/**
+ * Dellocate all configuration resources.
*
- * open one instance of this writer
- *
- * This function should perform any work necessary to write the incoming
- * stream. If To this aim, it may allocate its private data structure and store
- * a pointer to that structure via the given writer_node paramenter.
+ * This should free whatever was allocated by \ref parse_config_or_die().
*/
- int (*open)(struct writer_node *);
+ void (*free_config)(void *config);
/**
+ * Prepare the fd sets for select.
*
- * write a chunk of audio data
- *
- * This is called from the writer node group task's pre_select(). It
- * may use the sched pointer to add any file descriptors or to decrease
- * the select timeout. It must return positive on success and negative
- * on errors.
+ * This is called from scheduler. It may use the sched pointer to add
+ * any file descriptors or to decrease the select timeout.
*/
- int (*pre_select)(struct sched *s, struct writer_node *wn);
- /*
- * Called from the post_select function of the wng task. It must keep
- * track of the the number of bytes consumed from the wng's buffer via
- * the wn->written variable (which may be modified by the wng handling
- * functions). This function must return positive on success and
- * negative on errors.
+ void (*pre_select)(struct sched *s, struct task *t);
+ /**
+ * Write audio data.
+ *
+ * Called from the post_select function of the writer node's task.
*/
- int (*post_select)(struct sched *s, struct writer_node *wn);
+ void (*post_select)(struct sched *s, struct task *t);
/**
- * close one instance of the writer
+ * Close one instance of the writer.
*
* This function is assumed to succeed.
*/
void (*close)(struct writer_node *);
/**
- * shutdown the writer
+ * Shutdown the writer
*
- * This is a optional function pointer used for cleaning
- * up.
+ * This is a optional function pointer used for cleaning up.
*/
void (*shutdown)(struct writer_node *);
+ struct ggo_help help;
+ btr_command_handler execute;
};
-/**
- * describes a set of writer nodes that all write the same stream.
- */
-struct writer_node_group {
- /** number of nodes belonging to this group */
- unsigned num_writers;
- /** array of pointers to the corresponding writer nodes */
- struct writer_node *writer_nodes;
- /** the maximum of the chunk_bytes values of the writer nodes in this group */
- size_t max_chunk_bytes;
- /** non-zero if end of file was encountered by the feeding task */
- int *input_eof;
- /** non-zero if end of file was encountered */
- int eof;
- /** current output buffer */
- char *buf;
- /** number of bytes loaded in the output buffer */
- size_t *loaded;
- /** number of audio channels of the current stream */
- unsigned int *channels;
- /** sample rate of the current stream */
- unsigned int *samplerate;
- /** the task associated to this group */
- struct task task;
-};
-
-/** loop over each writer node in a writer group */
-#define FOR_EACH_WRITER_NODE(i, wng) for (i = 0; i < (wng)->num_writers; i++)
-/** loop over each supported writer */
+/** Loop over each supported writer. */
#define FOR_EACH_WRITER(i) for (i = 0; i < NUM_SUPPORTED_WRITERS; i++)
-/** declare the init functions of all supported writers */
+/** Declare the init functions of all supported writers. */
DECLARE_WRITER_INITS;
-/** array containing the name of each writer */
+/** Array containing the name of each writer. */
extern const char *writer_names[];
-/** the writer structure for each supported writer */
+/** The writer structure for each supported writer. */
extern struct writer writers[NUM_SUPPORTED_WRITERS];
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