2008-04-14 04:09:29 +00:00
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/*
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* Support for MPEG layer 2 audio streams.
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*
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* (actually, support for
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*
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* - MPEG-1 audio (described in ISO/IEC 11172-3), layers 1..3
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* - MPEG-2 audio (described in ISO/IEC 13818-3), layer 2
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* - unofficial MPEG-2.5
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*
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* but MPEG-2 layer 2 is the main target)
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the MPEG TS, PS and ES tools.
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*
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* The Initial Developer of the Original Code is Amino Communications Ltd.
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Amino Communications Ltd, Swavesey, Cambridge UK
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*
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* ***** END LICENSE BLOCK *****
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*/
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#ifndef _l2audio_fns
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#define _l2audio_fns
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#include "audio_defns.h"
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/*
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* Tidy up and free an audio frame datastructure when we've finished with it
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*
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* Empties the datastructure, frees it, and sets `frame` to NULL.
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*
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* If `frame` is already NULL, does nothing.
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*/
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extern void free_audio_frame(audio_frame_p *frame);
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/*
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* Read the next audio frame.
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*
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* Assumes that the input stream is synchronised - i.e., it does not
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* try to cope if the next three bytes are not '1111 1111 1111'.
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*
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* - `file` is the file descriptor of the audio file to read from
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* - `frame` is the audio frame that is read
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*
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* Returns 0 if all goes well, EOF if end-of-file is read, and 1 if something
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* goes wrong.
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*/
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extern int read_next_l2audio_frame(int file,
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audio_frame_p *frame);
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#endif // _l2audio_fns
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2008-06-14 16:05:00 +00:00
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// Local Variables:
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// tab-width: 8
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// indent-tabs-mode: nil
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// c-basic-offset: 2
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// End:
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// vim: set tabstop=8 shiftwidth=2 expandtab:
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