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61 lines
2.3 KiB
61 lines
2.3 KiB
/* |
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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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