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ffmpeg / libavcodec / ac3_parser.h @ 55736cfb

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/*
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 * AC3 parser prototypes
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 * Copyright (c) 2003 Fabrice Bellard.
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 * Copyright (c) 2003 Michael Niedermayer.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef FFMPEG_AC3_PARSER_H
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#define FFMPEG_AC3_PARSER_H
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#include "ac3.h"
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#include "bitstream.h"
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typedef enum {
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    AC3_PARSE_ERROR_SYNC        = -1,
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    AC3_PARSE_ERROR_BSID        = -2,
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    AC3_PARSE_ERROR_SAMPLE_RATE = -3,
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    AC3_PARSE_ERROR_FRAME_SIZE  = -4,
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    AC3_PARSE_ERROR_FRAME_TYPE  = -5,
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} AC3ParseError;
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/**
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 * Parses AC-3 frame header.
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 * Parses the header up to the lfeon element, which is the first 52 or 54 bits
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 * depending on the audio coding mode.
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 * @param gbc[in] BitContext containing the first 54 bits of the frame.
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 * @param hdr[out] Pointer to struct where header info is written.
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 * @return Returns 0 on success, -1 if there is a sync word mismatch,
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 * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
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 * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
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 */
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int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr);
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#endif /* FFMPEG_AC3_PARSER_H */