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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: http://www.musicpd.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 02111-1307 USA
*/
#ifndef MPD_PIPE_H
#define MPD_PIPE_H
struct music_chunk;
struct music_buffer;
/**
* A queue of #music_chunk objects. One party appends chunks at the
* tail, and the other consumes them from the head.
*/
struct music_pipe;
/**
* Creates a new #music_pipe object. It is empty.
*/
struct music_pipe *
music_pipe_new(void);
/**
* Frees the object. It must be empty now.
*/
void
music_pipe_free(struct music_pipe *mp);
/**
* Returns the first #music_chunk from the pipe. Returns NULL if the
* pipe is empty.
*/
const struct music_chunk *
music_pipe_peek(const struct music_pipe *mp);
/**
* Removes the first chunk from the head, and returns it.
*/
struct music_chunk *
music_pipe_shift(struct music_pipe *mp);
/**
* Clears the whole pipe and returns the chunks to the buffer.
*
* @param buffer the buffer object to return the chunks to
*/
void
music_pipe_clear(struct music_pipe *mp, struct music_buffer *buffer);
/**
* Pushes a chunk to the tail of the pipe.
*/
void
music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk);
/**
* Returns the number of chunks currently in this pipe.
*/
unsigned
music_pipe_size(const struct music_pipe *mp);
#endif
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