- /**
- * 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.
- *
- * It should check whether the command line options given by \a argv
- * and \a argc are valid and return a pointer to the writer-specific
- * configuration data determined by these 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_or_die)(int argc, char **argv);
- /**
- * Dellocate all configuration resources.
- *
- * This should free whatever was allocated by \ref parse_config_or_die().
- */
- void (*free_config)(void *config);
- /**
- * Prepare the fd sets for select.
- *
- * This is called from scheduler. It may use the sched pointer to add
- * any file descriptors or to decrease the select timeout.
- */
- void (*pre_select)(struct sched *s, struct task *t);
- /**
- * Write audio data.
- *
- * Called from the post_select function of the writer node's task.
- */
- void (*post_select)(struct sched *s, struct task *t);
+ /** Ask the scheduler to check whether data can be written. */
+ void (*pre_monitor)(struct sched *s, void *context);
+ /** Write audio data. */
+ int (*post_monitor)(struct sched *s, void *context);