libavcodec/ac3_parser_internal.h

   1 /*
   2  * AC-3 parser internal code
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_AC3_PARSER_INTERNAL_H
  22 #define AVCODEC_AC3_PARSER_INTERNAL_H
  23
  24 #include "ac3.h"
  25 #include "get_bits.h"
  26
  27 /**
  28  * Parse AC-3 frame header.
  29  * Parse the header up to the lfeon element, which is the first 52 or 54 bits
  30  * depending on the audio coding mode.
  31  * @param[in]  gbc BitContext containing the first 54 bits of the frame.
  32  * @param[out] hdr Pointer to struct where header info is written.
  33  * @return Returns 0 on success, -1 if there is a sync word mismatch,
  34  * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
  35  * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
  36  */
  37 int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr);
  38
  39 #endif /* AVCODEC_AC3_PARSER_INTERNAL_H */