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62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/*
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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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AC3_PARSE_ERROR_CRC = -6,
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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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/**
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* Parses AC-3 frame header and sets channel_map
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* Parses the header up to the lfeon (channel_map in E-AC-3)
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* element, which is the first 52, 54 or 104 bits depending
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* 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 value returned by ff_ac3_parse_header
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*/
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int ff_ac3_parse_header_full(GetBitContext *gbc, AC3HeaderInfo *hdr);
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#endif /* FFMPEG_AC3_PARSER_H */
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