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 */ 39int 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 */ 50int ff_ac3_parse_header_full(GetBitContext *gbc, AC3HeaderInfo *hdr); 51 52#endif /* AVCODEC_AC3_PARSER_H */ 53