Sat Aug 6 00:39:32 2011

Asterisk developer's documentation


slinfactory.h

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2005, Anthony Minessale II
00005  *
00006  * Anthony Minessale <anthmct@yahoo.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  * \brief A machine to gather up arbitrary frames and convert them
00021  * to raw slinear on demand.
00022  */
00023 
00024 #ifndef _ASTERISK_SLINFACTORY_H
00025 #define _ASTERISK_SLINFACTORY_H
00026 #include <stdlib.h>
00027 #include <unistd.h>
00028 #include <string.h>
00029 
00030 #if defined(__cplusplus) || defined(c_plusplus)
00031 extern "C" {
00032 #endif
00033 
00034 #define AST_SLINFACTORY_MAX_HOLD 1280
00035 
00036 struct ast_slinfactory {
00037    AST_LIST_HEAD_NOLOCK(, ast_frame) queue;
00038    struct ast_trans_pvt *trans;
00039    short hold[AST_SLINFACTORY_MAX_HOLD];
00040    short *offset;
00041    size_t holdlen;         /*!< in samples */
00042    unsigned int size;      /*!< in samples */
00043    unsigned int format;
00044 };
00045 
00046 void ast_slinfactory_init(struct ast_slinfactory *sf);
00047 void ast_slinfactory_destroy(struct ast_slinfactory *sf);
00048 int ast_slinfactory_feed(struct ast_slinfactory *sf, struct ast_frame *f);
00049 int ast_slinfactory_read(struct ast_slinfactory *sf, short *buf, size_t samples);
00050 unsigned int ast_slinfactory_available(const struct ast_slinfactory *sf);
00051 void ast_slinfactory_flush(struct ast_slinfactory *sf);
00052 
00053 #if defined(__cplusplus) || defined(c_plusplus)
00054 }
00055 #endif
00056 
00057 #endif /* _ASTERISK_SLINFACTORY_H */

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