libavcodec/ac3_parser.h

   1 /*
   2  * AC-3 parser prototypes
   3  * Copyright (c) 2003 Fabrice Bellard
   4  * Copyright (c) 2003 Michael Niedermayer
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef AVCODEC_AC3_PARSER_H
  24 #define AVCODEC_AC3_PARSER_H
  25
  26 #include "ac3.h"
  27 #include "get_bits.h"
  28
  29 /**
  30  * Parses AC-3 frame header.
  31  * Parses the header up to the lfeon element, which is the first 52 or 54 bits
  32  * depending on the audio coding mode.
  33  * @param gbc[in] BitContext containing the first 54 bits of the frame.
  34  * @param hdr[out] Pointer to struct where header info is written.
  35  * @return Returns 0 on success, -1 if there is a sync word mismatch,
  36  * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
  37  * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
  38  */
  39 int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr);
  40
  41 /**
  42  * Parses AC-3 frame header and sets channel_map
  43  * Parses the header up to the lfeon (channel_map in E-AC-3)
  44  * element, which is the first 52, 54 or 104 bits depending
  45  * on the audio coding mode.
  46  * @param gbc[in] BitContext containing the first 54 bits of the frame.
  47  * @param hdr[out] Pointer to struct where header info is written.
  48  * @return value returned by ff_ac3_parse_header
  49  */
  50 int ff_ac3_parse_header_full(GetBitContext *gbc, AC3HeaderInfo *hdr);
  51
  52 #endif /* AVCODEC_AC3_PARSER_H */