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/*
* Support for ISO/IEC 14496-3:2001(E) AAC ADTS audio streams.
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the MPEG TS, PS and ES tools.
*
* The Initial Developer of the Original Code is Amino Communications Ltd.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Amino Communications Ltd, Swavesey, Cambridge UK
*
* ***** END LICENSE BLOCK *****
*/
#ifndef _adts_fns
#define _adts_fns
#include "adts_defns.h"
#include "audio_fns.h"
/* Specify this flag to indicate that there is no emphasis
* field in the ADTS header. Generally, MPEG-2 ADTS audio
* (ID=0) has no emphasis field and MPEG-4 (ID=1) has
* emphasis, but some H.264/AAC streams have
* MPEG-4 ADTS with no emphasis and in those cases, you'll
* need this flag.
*/
#define ADTS_FLAG_NO_EMPHASIS (1<<0)
/* Specify this flag to indicate that there is always an
* emphasis field, even if the ID says there isn't one -
* included for symmetry with NO_EMPHASIS.
*/
#define ADTS_FLAG_FORCE_EMPHASIS (1<<1)
/*
* Read the next ADTS frame.
*
* Assumes that the input stream is synchronised - i.e., it does not
* try to cope if the next three bytes are not '1111 1111 1111'.
*
* - `file` is the file descriptor of the ADTS file to read from
* - `frame` is the ADTS frame that is read
* - `flags` indicates if we are forcing the recognition of "emphasis"
* fields, etc.
*
* Returns 0 if all goes well, EOF if end-of-file is read, and 1 if something
* goes wrong.
*/
extern int read_next_adts_frame(int file,
audio_frame_p *frame,
unsigned int flags);
#endif // _adts_fns
// Local Variables:
// tab-width: 8
// indent-tabs-mode: nil
// c-basic-offset: 2
// End:
// vim: set tabstop=8 shiftwidth=2 expandtab:
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