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op.h

/* 
 * Copyright 2004 Timo Hirvonen
 * 
 * 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
 * 02111-1307, USA.
 */

#ifndef _OP_H
#define _OP_H

#include <sf.h>

enum {
      /* no error */
      OP_ERROR_SUCCESS,
      /* system error (error code in errno) */
      OP_ERROR_ERRNO,
      /* no such plugin */
      OP_ERROR_NO_PLUGIN,
      /* plugin not initialized */
      OP_ERROR_NOT_INITIALIZED,
      /* function not supported */
      OP_ERROR_NOT_SUPPORTED,
      /* plugin does not support the sample format */
      OP_ERROR_SAMPLE_FORMAT,
      /* plugin does not have this option */
      OP_ERROR_NOT_OPTION,
      /*  */
      OP_ERROR_INTERNAL
};

struct output_plugin_ops {
      int (*init)(void);
      int (*exit)(void);
      int (*open)(sample_format_t sf);
      int (*close)(void);
      int (*drop)(void);
      int (*write)(const char *buffer, int count);
      int (*buffer_space)(void);

      /* these can be NULL */
      int (*pause)(void);
      int (*unpause)(void);

      int (*set_option)(int key, const char *val);
      int (*get_option)(int key, char **val);
};

#endif

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