93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief Asterisk internal frame definitions.
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* \arg For an explanation of frames, see \ref Def_Frame
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* \arg Frames are send of Asterisk channels, see \ref Def_Channel
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*/
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#ifndef _ASTERISK_SMOOTHER_H
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#define _ASTERISK_SMOOTHER_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#include "asterisk/endian.h"
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#define AST_SMOOTHER_FLAG_G729 (1 << 0)
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#define AST_SMOOTHER_FLAG_BE (1 << 1)
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#define AST_SMOOTHER_FLAG_FORCED (1 << 2)
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/*! \name AST_Smoother
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*
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* @{
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*/
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/*! \page ast_smooth The AST Frame Smoother
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The ast_smoother interface was designed specifically
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to take frames of variant sizes and produce frames of a single expected
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size, precisely what you want to do.
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The basic interface is:
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- Initialize with ast_smoother_new()
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- Queue input frames with ast_smoother_feed()
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- Get output frames with ast_smoother_read()
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- when you're done, free the structure with ast_smoother_free()
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- Also see ast_smoother_test_flag(), ast_smoother_set_flags(), ast_smoother_get_flags(), ast_smoother_reset()
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*/
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struct ast_smoother;
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struct ast_frame;
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struct ast_smoother *ast_smoother_new(int bytes);
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void ast_smoother_set_flags(struct ast_smoother *smoother, int flags);
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int ast_smoother_get_flags(struct ast_smoother *smoother);
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int ast_smoother_test_flag(struct ast_smoother *s, int flag);
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void ast_smoother_free(struct ast_smoother *s);
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void ast_smoother_reset(struct ast_smoother *s, int bytes);
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/*!
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* \brief Reconfigure an existing smoother to output a different number of bytes per frame
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* \param s the smoother to reconfigure
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* \param bytes the desired number of bytes per output frame
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* \return nothing
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*
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*/
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void ast_smoother_reconfigure(struct ast_smoother *s, int bytes);
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int __ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f, int swap);
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struct ast_frame *ast_smoother_read(struct ast_smoother *s);
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#define ast_smoother_feed(s,f) __ast_smoother_feed(s, f, 0)
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define ast_smoother_feed_be(s,f) __ast_smoother_feed(s, f, 1)
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#define ast_smoother_feed_le(s,f) __ast_smoother_feed(s, f, 0)
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#else
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#define ast_smoother_feed_be(s,f) __ast_smoother_feed(s, f, 0)
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#define ast_smoother_feed_le(s,f) __ast_smoother_feed(s, f, 1)
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#endif
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/*! @} */
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* _ASTERISK_SMOOTHER_H */
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