iobuff.h

Intercom 是一个 Unix系统上灵活的语音传输软件。支持标准音频压缩比如GSM, G.711, and G.72x和其他音频编码。Intercom专为高速网络设计来传输高品质的语音

/*  iobuff.h -- Prototypes and declarations for iobuff.c
    Copyright (C) 2001-2003  Shane Wegner
    This file is part of Intercom.

    Intercom is free software; you can redistribute it and/or modify it
    under the terms of version 2 of the GNU General Public License as
    published by the Free Software Foundation.

    Intercom 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 version 2 of the GNU General Public
    License along with Intercom; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

    To contact the author, please send email to [e-mail].
    */

/* $Id: iobuff.h,v 1.8 2003/02/13 20:22:49 shane Exp $ */

#ifndef IOBUFF_H
#define IOBUFF_H

#include <sys/types.h>
#ifdef _REENTRANT
#include <pthread.h>
#endif

#define IOB_PAGESIZE (4096 - (SIZEOF_SIZE_T * 2) - (SIZEOF_VOID_P * 2))

struct iob_page {
size_t len; /* bytes of valid data */
size_t pos;
char data[IOB_PAGESIZE];
struct iob_page *prev;
struct iob_page *next;
};

struct iobuff {
#ifdef _REENTRANT
pthread_mutex_t mutex;
#endif
size_t minpages; /* Don't free this many pages */
struct iob_page *page;
};

void iob_init(struct iobuff *iob);
void iob_setminbytes(struct iobuff *iob, size_t n);
void iob_flush(struct iobuff *iob);
void iob_queue(struct iobuff *iob, const char *buff, size_t n);
size_t iob_buffsize(struct iobuff *iob);
size_t iob_read(struct iobuff *iob, char *buff, size_t n);
size_t iob_readkeep(struct iobuff *iob, char *buff, size_t n);
void iob_delete(struct iobuff *iob, size_t n);

#endif